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-rw-r--r--drivers/dma/Kconfig18
-rw-r--r--drivers/dma/Makefile1
-rw-r--r--drivers/dma/amba-pl08x.c86
-rw-r--r--drivers/dma/bcm2835-dma.c604
-rw-r--r--drivers/dma/dmaengine.c37
-rw-r--r--drivers/dma/dw/core.c495
-rw-r--r--drivers/dma/dw/pci.c5
-rw-r--r--drivers/dma/dw/platform.c40
-rw-r--r--drivers/dma/dw/regs.h56
-rw-r--r--drivers/dma/edma.c11
-rw-r--r--drivers/dma/fsldma.c3
-rw-r--r--drivers/dma/hsu/hsu.c8
-rw-r--r--drivers/dma/hsu/hsu.h4
-rw-r--r--drivers/dma/ioat/init.c17
-rw-r--r--drivers/dma/ioat/registers.h7
-rw-r--r--drivers/dma/mmp_pdma.c3
-rw-r--r--drivers/dma/mpc512x_dma.c174
-rw-r--r--drivers/dma/mv_xor.c98
-rw-r--r--drivers/dma/mv_xor.h1
-rw-r--r--drivers/dma/of-dma.c12
-rw-r--r--drivers/dma/pxa_dma.c16
-rw-r--r--drivers/dma/qcom/Makefile2
-rw-r--r--drivers/dma/qcom/bam_dma.c38
-rw-r--r--drivers/dma/qcom/hidma.c52
-rw-r--r--drivers/dma/qcom/hidma.h40
-rw-r--r--drivers/dma/qcom/hidma_dbg.c217
-rw-r--r--drivers/dma/qcom/hidma_ll.c872
-rw-r--r--drivers/dma/qcom/hidma_mgmt.c113
-rw-r--r--drivers/dma/sun6i-dma.c254
-rw-r--r--drivers/dma/tegra20-apb-dma.c16
-rw-r--r--drivers/dma/tegra210-adma.c840
-rw-r--r--drivers/dma/xilinx/xilinx_vdma.c1663
32 files changed, 4730 insertions, 1073 deletions
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index d96d87c56f2e..8c98779a12b1 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -332,7 +332,7 @@ config MPC512X_DMA
config MV_XOR
bool "Marvell XOR engine support"
- depends on PLAT_ORION
+ depends on PLAT_ORION || ARCH_MVEBU || COMPILE_TEST
select DMA_ENGINE
select DMA_ENGINE_RAID
select ASYNC_TX_ENABLE_CHANNEL_SWITCH
@@ -467,6 +467,20 @@ config TEGRA20_APB_DMA
This DMA controller transfers data from memory to peripheral fifo
or vice versa. It does not support memory to memory data transfer.
+config TEGRA210_ADMA
+ bool "NVIDIA Tegra210 ADMA support"
+ depends on ARCH_TEGRA_210_SOC
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ select PM_CLK
+ help
+ Support for the NVIDIA Tegra210 ADMA controller driver. The
+ DMA controller has multiple DMA channels and is used to service
+ various audio clients in the Tegra210 audio processing engine
+ (APE). This DMA controller transfers data from memory to
+ peripheral and vice versa. It does not support memory to
+ memory data transfer.
+
config TIMB_DMA
tristate "Timberdale FPGA DMA support"
depends on MFD_TIMBERDALE
@@ -507,7 +521,7 @@ config XGENE_DMA
config XILINX_VDMA
tristate "Xilinx AXI VDMA Engine"
- depends on (ARCH_ZYNQ || MICROBLAZE)
+ depends on (ARCH_ZYNQ || MICROBLAZE || ARM64)
select DMA_ENGINE
help
Enable support for Xilinx AXI VDMA Soft IP.
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 6084127c1486..614f28b0b739 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -59,6 +59,7 @@ obj-$(CONFIG_STM32_DMA) += stm32-dma.o
obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
+obj-$(CONFIG_TEGRA210_ADMA) += tegra210-adma.o
obj-$(CONFIG_TIMB_DMA) += timb_dma.o
obj-$(CONFIG_TI_CPPI41) += cppi41.o
obj-$(CONFIG_TI_DMA_CROSSBAR) += ti-dma-crossbar.o
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 9b42c0588550..81db1c4811ce 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -107,16 +107,20 @@ struct pl08x_driver_data;
/**
* struct vendor_data - vendor-specific config parameters for PL08x derivatives
* @channels: the number of channels available in this variant
+ * @signals: the number of request signals available from the hardware
* @dualmaster: whether this version supports dual AHB masters or not.
* @nomadik: whether the channels have Nomadik security extension bits
* that need to be checked for permission before use and some registers are
* missing
* @pl080s: whether this version is a PL080S, which has separate register and
* LLI word for transfer size.
+ * @max_transfer_size: the maximum single element transfer size for this
+ * PL08x variant.
*/
struct vendor_data {
u8 config_offset;
u8 channels;
+ u8 signals;
bool dualmaster;
bool nomadik;
bool pl080s;
@@ -235,7 +239,7 @@ struct pl08x_dma_chan {
struct virt_dma_chan vc;
struct pl08x_phy_chan *phychan;
const char *name;
- const struct pl08x_channel_data *cd;
+ struct pl08x_channel_data *cd;
struct dma_slave_config cfg;
struct pl08x_txd *at;
struct pl08x_driver_data *host;
@@ -1909,6 +1913,12 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
if (slave) {
chan->cd = &pl08x->pd->slave_channels[i];
+ /*
+ * Some implementations have muxed signals, whereas some
+ * use a mux in front of the signals and need dynamic
+ * assignment of signals.
+ */
+ chan->signal = i;
pl08x_dma_slave_init(chan);
} else {
chan->cd = &pl08x->pd->memcpy_channel;
@@ -2050,40 +2060,33 @@ static struct dma_chan *pl08x_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
struct pl08x_driver_data *pl08x = ofdma->of_dma_data;
- struct pl08x_channel_data *data;
- struct pl08x_dma_chan *chan;
struct dma_chan *dma_chan;
+ struct pl08x_dma_chan *plchan;
if (!pl08x)
return NULL;
- if (dma_spec->args_count != 2)
+ if (dma_spec->args_count != 2) {
+ dev_err(&pl08x->adev->dev,
+ "DMA channel translation requires two cells\n");
return NULL;
+ }
dma_chan = pl08x_find_chan_id(pl08x, dma_spec->args[0]);
- if (dma_chan)
- return dma_get_slave_channel(dma_chan);
-
- chan = devm_kzalloc(pl08x->slave.dev, sizeof(*chan) + sizeof(*data),
- GFP_KERNEL);
- if (!chan)
+ if (!dma_chan) {
+ dev_err(&pl08x->adev->dev,
+ "DMA slave channel not found\n");
return NULL;
+ }
- data = (void *)&chan[1];
- data->bus_id = "(none)";
- data->periph_buses = dma_spec->args[1];
-
- chan->cd = data;
- chan->host = pl08x;
- chan->slave = true;
- chan->name = data->bus_id;
- chan->state = PL08X_CHAN_IDLE;
- chan->signal = dma_spec->args[0];
- chan->vc.desc_free = pl08x_desc_free;
-
- vchan_init(&chan->vc, &pl08x->slave);
+ plchan = to_pl08x_chan(dma_chan);
+ dev_dbg(&pl08x->adev->dev,
+ "translated channel for signal %d\n",
+ dma_spec->args[0]);
- return dma_get_slave_channel(&chan->vc.chan);
+ /* Augment channel data for applicable AHB buses */
+ plchan->cd->periph_buses = dma_spec->args[1];
+ return dma_get_slave_channel(dma_chan);
}
static int pl08x_of_probe(struct amba_device *adev,
@@ -2091,9 +2094,11 @@ static int pl08x_of_probe(struct amba_device *adev,
struct device_node *np)
{
struct pl08x_platform_data *pd;
+ struct pl08x_channel_data *chanp = NULL;
u32 cctl_memcpy = 0;
u32 val;
int ret;
+ int i;
pd = devm_kzalloc(&adev->dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
@@ -2195,6 +2200,27 @@ static int pl08x_of_probe(struct amba_device *adev,
/* Use the buses that can access memory, obviously */
pd->memcpy_channel.periph_buses = pd->mem_buses;
+ /*
+ * Allocate channel data for all possible slave channels (one
+ * for each possible signal), channels will then be allocated
+ * for a device and have it's AHB interfaces set up at
+ * translation time.
+ */
+ chanp = devm_kcalloc(&adev->dev,
+ pl08x->vd->signals,
+ sizeof(struct pl08x_channel_data),
+ GFP_KERNEL);
+ if (!chanp)
+ return -ENOMEM;
+
+ pd->slave_channels = chanp;
+ for (i = 0; i < pl08x->vd->signals; i++) {
+ /* chanp->periph_buses will be assigned at translation */
+ chanp->bus_id = kasprintf(GFP_KERNEL, "slave%d", i);
+ chanp++;
+ }
+ pd->num_slave_channels = pl08x->vd->signals;
+
pl08x->pd = pd;
return of_dma_controller_register(adev->dev.of_node, pl08x_of_xlate,
@@ -2234,6 +2260,10 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
goto out_no_pl08x;
}
+ /* Assign useful pointers to the driver state */
+ pl08x->adev = adev;
+ pl08x->vd = vd;
+
/* Initialize memcpy engine */
dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
pl08x->memcpy.dev = &adev->dev;
@@ -2284,10 +2314,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
}
}
- /* Assign useful pointers to the driver state */
- pl08x->adev = adev;
- pl08x->vd = vd;
-
/* By default, AHB1 only. If dualmaster, from platform */
pl08x->lli_buses = PL08X_AHB1;
pl08x->mem_buses = PL08X_AHB1;
@@ -2438,6 +2464,7 @@ out_no_pl08x:
static struct vendor_data vendor_pl080 = {
.config_offset = PL080_CH_CONFIG,
.channels = 8,
+ .signals = 16,
.dualmaster = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
@@ -2445,6 +2472,7 @@ static struct vendor_data vendor_pl080 = {
static struct vendor_data vendor_nomadik = {
.config_offset = PL080_CH_CONFIG,
.channels = 8,
+ .signals = 32,
.dualmaster = true,
.nomadik = true,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
@@ -2453,6 +2481,7 @@ static struct vendor_data vendor_nomadik = {
static struct vendor_data vendor_pl080s = {
.config_offset = PL080S_CH_CONFIG,
.channels = 8,
+ .signals = 32,
.pl080s = true,
.max_transfer_size = PL080S_CONTROL_TRANSFER_SIZE_MASK,
};
@@ -2460,6 +2489,7 @@ static struct vendor_data vendor_pl080s = {
static struct vendor_data vendor_pl081 = {
.config_offset = PL080_CH_CONFIG,
.channels = 2,
+ .signals = 16,
.dualmaster = false,
.max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK,
};
diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
index 996c4b00d323..6149b27c33ad 100644
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -46,6 +46,9 @@
#include "virt-dma.h"
+#define BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED 14
+#define BCM2835_DMA_CHAN_NAME_SIZE 8
+
struct bcm2835_dmadev {
struct dma_device ddev;
spinlock_t lock;
@@ -73,7 +76,6 @@ struct bcm2835_chan {
struct list_head node;
struct dma_slave_config cfg;
- bool cyclic;
unsigned int dreq;
int ch;
@@ -82,6 +84,9 @@ struct bcm2835_chan {
void __iomem *chan_base;
int irq_number;
+ unsigned int irq_flags;
+
+ bool is_lite_channel;
};
struct bcm2835_desc {
@@ -89,47 +94,104 @@ struct bcm2835_desc {
struct virt_dma_desc vd;
enum dma_transfer_direction dir;
- struct bcm2835_cb_entry *cb_list;
-
unsigned int frames;
size_t size;
+
+ bool cyclic;
+
+ struct bcm2835_cb_entry cb_list[];
};
#define BCM2835_DMA_CS 0x00
#define BCM2835_DMA_ADDR 0x04
+#define BCM2835_DMA_TI 0x08
#define BCM2835_DMA_SOURCE_AD 0x0c
#define BCM2835_DMA_DEST_AD 0x10
-#define BCM2835_DMA_NEXTCB 0x1C
+#define BCM2835_DMA_LEN 0x14
+#define BCM2835_DMA_STRIDE 0x18
+#define BCM2835_DMA_NEXTCB 0x1c
+#define BCM2835_DMA_DEBUG 0x20
/* DMA CS Control and Status bits */
-#define BCM2835_DMA_ACTIVE BIT(0)
-#define BCM2835_DMA_INT BIT(2)
+#define BCM2835_DMA_ACTIVE BIT(0) /* activate the DMA */
+#define BCM2835_DMA_END BIT(1) /* current CB has ended */
+#define BCM2835_DMA_INT BIT(2) /* interrupt status */
+#define BCM2835_DMA_DREQ BIT(3) /* DREQ state */
#define BCM2835_DMA_ISPAUSED BIT(4) /* Pause requested or not active */
#define BCM2835_DMA_ISHELD BIT(5) /* Is held by DREQ flow control */
-#define BCM2835_DMA_ERR BIT(8)
+#define BCM2835_DMA_WAITING_FOR_WRITES BIT(6) /* waiting for last
+ * AXI-write to ack
+ */
+#define BCM2835_DMA_ERR BIT(8)
+#define BCM2835_DMA_PRIORITY(x) ((x & 15) << 16) /* AXI priority */
+#define BCM2835_DMA_PANIC_PRIORITY(x) ((x & 15) << 20) /* panic priority */
+/* current value of TI.BCM2835_DMA_WAIT_RESP */
+#define BCM2835_DMA_WAIT_FOR_WRITES BIT(28)
+#define BCM2835_DMA_DIS_DEBUG BIT(29) /* disable debug pause signal */
#define BCM2835_DMA_ABORT BIT(30) /* Stop current CB, go to next, WO */
#define BCM2835_DMA_RESET BIT(31) /* WO, self clearing */
+/* Transfer information bits - also bcm2835_cb.info field */
#define BCM2835_DMA_INT_EN BIT(0)
+#define BCM2835_DMA_TDMODE BIT(1) /* 2D-Mode */
+#define BCM2835_DMA_WAIT_RESP BIT(3) /* wait for AXI-write to be acked */
#define BCM2835_DMA_D_INC BIT(4)
-#define BCM2835_DMA_D_DREQ BIT(6)
+#define BCM2835_DMA_D_WIDTH BIT(5) /* 128bit writes if set */
+#define BCM2835_DMA_D_DREQ BIT(6) /* enable DREQ for destination */
+#define BCM2835_DMA_D_IGNORE BIT(7) /* ignore destination writes */
#define BCM2835_DMA_S_INC BIT(8)
-#define BCM2835_DMA_S_DREQ BIT(10)
-
-#define BCM2835_DMA_PER_MAP(x) ((x) << 16)
+#define BCM2835_DMA_S_WIDTH BIT(9) /* 128bit writes if set */
+#define BCM2835_DMA_S_DREQ BIT(10) /* enable SREQ for source */
+#define BCM2835_DMA_S_IGNORE BIT(11) /* ignore source reads - read 0 */
+#define BCM2835_DMA_BURST_LENGTH(x) ((x & 15) << 12)
+#define BCM2835_DMA_PER_MAP(x) ((x & 31) << 16) /* REQ source */
+#define BCM2835_DMA_WAIT(x) ((x & 31) << 21) /* add DMA-wait cycles */
+#define BCM2835_DMA_NO_WIDE_BURSTS BIT(26) /* no 2 beat write bursts */
+
+/* debug register bits */
+#define BCM2835_DMA_DEBUG_LAST_NOT_SET_ERR BIT(0)
+#define BCM2835_DMA_DEBUG_FIFO_ERR BIT(1)
+#define BCM2835_DMA_DEBUG_READ_ERR BIT(2)
+#define BCM2835_DMA_DEBUG_OUTSTANDING_WRITES_SHIFT 4
+#define BCM2835_DMA_DEBUG_OUTSTANDING_WRITES_BITS 4
+#define BCM2835_DMA_DEBUG_ID_SHIFT 16
+#define BCM2835_DMA_DEBUG_ID_BITS 9
+#define BCM2835_DMA_DEBUG_STATE_SHIFT 16
+#define BCM2835_DMA_DEBUG_STATE_BITS 9
+#define BCM2835_DMA_DEBUG_VERSION_SHIFT 25
+#define BCM2835_DMA_DEBUG_VERSION_BITS 3
+#define BCM2835_DMA_DEBUG_LITE BIT(28)
+
+/* shared registers for all dma channels */
+#define BCM2835_DMA_INT_STATUS 0xfe0
+#define BCM2835_DMA_ENABLE 0xff0
#define BCM2835_DMA_DATA_TYPE_S8 1
#define BCM2835_DMA_DATA_TYPE_S16 2
#define BCM2835_DMA_DATA_TYPE_S32 4
#define BCM2835_DMA_DATA_TYPE_S128 16
-#define BCM2835_DMA_BULK_MASK BIT(0)
-#define BCM2835_DMA_FIQ_MASK (BIT(2) | BIT(3))
-
/* Valid only for channels 0 - 14, 15 has its own base address */
#define BCM2835_DMA_CHAN(n) ((n) << 8) /* Base address */
#define BCM2835_DMA_CHANIO(base, n) ((base) + BCM2835_DMA_CHAN(n))
+/* the max dma length for different channels */
+#define MAX_DMA_LEN SZ_1G
+#define MAX_LITE_DMA_LEN (SZ_64K - 4)
+
+static inline size_t bcm2835_dma_max_frame_length(struct bcm2835_chan *c)
+{
+ /* lite and normal channels have different max frame length */
+ return c->is_lite_channel ? MAX_LITE_DMA_LEN : MAX_DMA_LEN;
+}
+
+/* how many frames of max_len size do we need to transfer len bytes */
+static inline size_t bcm2835_dma_frames_for_length(size_t len,
+ size_t max_len)
+{
+ return DIV_ROUND_UP(len, max_len);
+}
+
static inline struct bcm2835_dmadev *to_bcm2835_dma_dev(struct dma_device *d)
{
return container_of(d, struct bcm2835_dmadev, ddev);
@@ -146,19 +208,209 @@ static inline struct bcm2835_desc *to_bcm2835_dma_desc(
return container_of(t, struct bcm2835_desc, vd.tx);
}
-static void bcm2835_dma_desc_free(struct virt_dma_desc *vd)
+static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc)
{
- struct bcm2835_desc *desc = container_of(vd, struct bcm2835_desc, vd);
- int i;
+ size_t i;
for (i = 0; i < desc->frames; i++)
dma_pool_free(desc->c->cb_pool, desc->cb_list[i].cb,
desc->cb_list[i].paddr);
- kfree(desc->cb_list);
kfree(desc);
}
+static void bcm2835_dma_desc_free(struct virt_dma_desc *vd)
+{
+ bcm2835_dma_free_cb_chain(
+ container_of(vd, struct bcm2835_desc, vd));
+}
+
+static void bcm2835_dma_create_cb_set_length(
+ struct bcm2835_chan *chan,
+ struct bcm2835_dma_cb *control_block,
+ size_t len,
+ size_t period_len,
+ size_t *total_len,
+ u32 finalextrainfo)
+{
+ size_t max_len = bcm2835_dma_max_frame_length(chan);
+
+ /* set the length taking lite-channel limitations into account */
+ control_block->length = min_t(u32, len, max_len);
+
+ /* finished if we have no period_length */
+ if (!period_len)
+ return;
+
+ /*
+ * period_len means: that we need to generate
+ * transfers that are terminating at every
+ * multiple of period_len - this is typically
+ * used to set the interrupt flag in info
+ * which is required during cyclic transfers
+ */
+
+ /* have we filled in period_length yet? */
+ if (*total_len + control_block->length < period_len)
+ return;
+
+ /* calculate the length that remains to reach period_length */
+ control_block->length = period_len - *total_len;
+
+ /* reset total_length for next period */
+ *total_len = 0;
+
+ /* add extrainfo bits in info */
+ control_block->info |= finalextrainfo;
+}
+
+static inline size_t bcm2835_dma_count_frames_for_sg(
+ struct bcm2835_chan *c,
+ struct scatterlist *sgl,
+ unsigned int sg_len)
+{
+ size_t frames = 0;
+ struct scatterlist *sgent;
+ unsigned int i;
+ size_t plength = bcm2835_dma_max_frame_length(c);
+
+ for_each_sg(sgl, sgent, sg_len, i)
+ frames += bcm2835_dma_frames_for_length(
+ sg_dma_len(sgent), plength);
+
+ return frames;
+}
+
+/**
+ * bcm2835_dma_create_cb_chain - create a control block and fills data in
+ *
+ * @chan: the @dma_chan for which we run this
+ * @direction: the direction in which we transfer
+ * @cyclic: it is a cyclic transfer
+ * @info: the default info bits to apply per controlblock
+ * @frames: number of controlblocks to allocate
+ * @src: the src address to assign (if the S_INC bit is set
+ * in @info, then it gets incremented)
+ * @dst: the dst address to assign (if the D_INC bit is set
+ * in @info, then it gets incremented)
+ * @buf_len: the full buffer length (may also be 0)
+ * @period_len: the period length when to apply @finalextrainfo
+ * in addition to the last transfer
+ * this will also break some control-blocks early
+ * @finalextrainfo: additional bits in last controlblock
+ * (or when period_len is reached in case of cyclic)
+ * @gfp: the GFP flag to use for allocation
+ */
+static struct bcm2835_desc *bcm2835_dma_create_cb_chain(
+ struct dma_chan *chan, enum dma_transfer_direction direction,
+ bool cyclic, u32 info, u32 finalextrainfo, size_t frames,
+ dma_addr_t src, dma_addr_t dst, size_t buf_len,
+ size_t period_len, gfp_t gfp)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+ size_t len = buf_len, total_len;
+ size_t frame;
+ struct bcm2835_desc *d;
+ struct bcm2835_cb_entry *cb_entry;
+ struct bcm2835_dma_cb *control_block;
+
+ if (!frames)
+ return NULL;
+
+ /* allocate and setup the descriptor. */
+ d = kzalloc(sizeof(*d) + frames * sizeof(struct bcm2835_cb_entry),
+ gfp);
+ if (!d)
+ return NULL;
+
+ d->c = c;
+ d->dir = direction;
+ d->cyclic = cyclic;
+
+ /*
+ * Iterate over all frames, create a control block
+ * for each frame and link them together.
+ */
+ for (frame = 0, total_len = 0; frame < frames; d->frames++, frame++) {
+ cb_entry = &d->cb_list[frame];
+ cb_entry->cb = dma_pool_alloc(c->cb_pool, gfp,
+ &cb_entry->paddr);
+ if (!cb_entry->cb)
+ goto error_cb;
+
+ /* fill in the control block */
+ control_block = cb_entry->cb;
+ control_block->info = info;
+ control_block->src = src;
+ control_block->dst = dst;
+ control_block->stride = 0;
+ control_block->next = 0;
+ /* set up length in control_block if requested */
+ if (buf_len) {
+ /* calculate length honoring period_length */
+ bcm2835_dma_create_cb_set_length(
+ c, control_block,
+ len, period_len, &total_len,
+ cyclic ? finalextrainfo : 0);
+
+ /* calculate new remaining length */
+ len -= control_block->length;
+ }
+
+ /* link this the last controlblock */
+ if (frame)
+ d->cb_list[frame - 1].cb->next = cb_entry->paddr;
+
+ /* update src and dst and length */
+ if (src && (info & BCM2835_DMA_S_INC))
+ src += control_block->length;
+ if (dst && (info & BCM2835_DMA_D_INC))
+ dst += control_block->length;
+
+ /* Length of total transfer */
+ d->size += control_block->length;
+ }
+
+ /* the last frame requires extra flags */
+ d->cb_list[d->frames - 1].cb->info |= finalextrainfo;
+
+ /* detect a size missmatch */
+ if (buf_len && (d->size != buf_len))
+ goto error_cb;
+
+ return d;
+error_cb:
+ bcm2835_dma_free_cb_chain(d);
+
+ return NULL;
+}
+
+static void bcm2835_dma_fill_cb_chain_with_sg(
+ struct dma_chan *chan,
+ enum dma_transfer_direction direction,
+ struct bcm2835_cb_entry *cb,
+ struct scatterlist *sgl,
+ unsigned int sg_len)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+ size_t max_len = bcm2835_dma_max_frame_length(c);
+ unsigned int i, len;
+ dma_addr_t addr;
+ struct scatterlist *sgent;
+
+ for_each_sg(sgl, sgent, sg_len, i) {
+ for (addr = sg_dma_address(sgent), len = sg_dma_len(sgent);
+ len > 0;
+ addr += cb->cb->length, len -= cb->cb->length, cb++) {
+ if (direction == DMA_DEV_TO_MEM)
+ cb->cb->dst = addr;
+ else
+ cb->cb->src = addr;
+ cb->cb->length = min(len, max_len);
+ }
+ }
+}
+
static int bcm2835_dma_abort(void __iomem *chan_base)
{
unsigned long cs;
@@ -218,6 +470,15 @@ static irqreturn_t bcm2835_dma_callback(int irq, void *data)
struct bcm2835_desc *d;
unsigned long flags;
+ /* check the shared interrupt */
+ if (c->irq_flags & IRQF_SHARED) {
+ /* check if the interrupt is enabled */
+ flags = readl(c->chan_base + BCM2835_DMA_CS);
+ /* if not set then we are not the reason for the irq */
+ if (!(flags & BCM2835_DMA_INT))
+ return IRQ_NONE;
+ }
+
spin_lock_irqsave(&c->vc.lock, flags);
/* Acknowledge interrupt */
@@ -226,12 +487,18 @@ static irqreturn_t bcm2835_dma_callback(int irq, void *data)
d = c->desc;
if (d) {
- /* TODO Only works for cyclic DMA */
- vchan_cyclic_callback(&d->vd);
- }
+ if (d->cyclic) {
+ /* call the cyclic callback */
+ vchan_cyclic_callback(&d->vd);
- /* Keep the DMA engine running */
- writel(BCM2835_DMA_ACTIVE, c->chan_base + BCM2835_DMA_CS);
+ /* Keep the DMA engine running */
+ writel(BCM2835_DMA_ACTIVE,
+ c->chan_base + BCM2835_DMA_CS);
+ } else {
+ vchan_cookie_complete(&c->desc->vd);
+ bcm2835_dma_start_desc(c);
+ }
+ }
spin_unlock_irqrestore(&c->vc.lock, flags);
@@ -252,8 +519,8 @@ static int bcm2835_dma_alloc_chan_resources(struct dma_chan *chan)
return -ENOMEM;
}
- return request_irq(c->irq_number,
- bcm2835_dma_callback, 0, "DMA IRQ", c);
+ return request_irq(c->irq_number, bcm2835_dma_callback,
+ c->irq_flags, "DMA IRQ", c);
}
static void bcm2835_dma_free_chan_resources(struct dma_chan *chan)
@@ -339,8 +606,6 @@ static void bcm2835_dma_issue_pending(struct dma_chan *chan)
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
unsigned long flags;
- c->cyclic = true; /* Nothing else is implemented */
-
spin_lock_irqsave(&c->vc.lock, flags);
if (vchan_issue_pending(&c->vc) && !c->desc)
bcm2835_dma_start_desc(c);
@@ -348,122 +613,160 @@ static void bcm2835_dma_issue_pending(struct dma_chan *chan)
spin_unlock_irqrestore(&c->vc.lock, flags);
}
-static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic(
- struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
- size_t period_len, enum dma_transfer_direction direction,
- unsigned long flags)
+struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_memcpy(
+ struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
+ size_t len, unsigned long flags)
{
struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
- enum dma_slave_buswidth dev_width;
struct bcm2835_desc *d;
- dma_addr_t dev_addr;
- unsigned int es, sync_type;
- unsigned int frame;
- int i;
+ u32 info = BCM2835_DMA_D_INC | BCM2835_DMA_S_INC;
+ u32 extra = BCM2835_DMA_INT_EN | BCM2835_DMA_WAIT_RESP;
+ size_t max_len = bcm2835_dma_max_frame_length(c);
+ size_t frames;
+
+ /* if src, dst or len is not given return with an error */
+ if (!src || !dst || !len)
+ return NULL;
+
+ /* calculate number of frames */
+ frames = bcm2835_dma_frames_for_length(len, max_len);
+
+ /* allocate the CB chain - this also fills in the pointers */
+ d = bcm2835_dma_create_cb_chain(chan, DMA_MEM_TO_MEM, false,
+ info, extra, frames,
+ src, dst, len, 0, GFP_KERNEL);
+ if (!d)
+ return NULL;
+
+ return vchan_tx_prep(&c->vc, &d->vd, flags);
+}
+
+static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg(
+ struct dma_chan *chan,
+ struct scatterlist *sgl, unsigned int sg_len,
+ enum dma_transfer_direction direction,
+ unsigned long flags, void *context)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+ struct bcm2835_desc *d;
+ dma_addr_t src = 0, dst = 0;
+ u32 info = BCM2835_DMA_WAIT_RESP;
+ u32 extra = BCM2835_DMA_INT_EN;
+ size_t frames;
- /* Grab configuration */
if (!is_slave_direction(direction)) {
- dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
+ dev_err(chan->device->dev,
+ "%s: bad direction?\n", __func__);
return NULL;
}
+ if (c->dreq != 0)
+ info |= BCM2835_DMA_PER_MAP(c->dreq);
+
if (direction == DMA_DEV_TO_MEM) {
- dev_addr = c->cfg.src_addr;
- dev_width = c->cfg.src_addr_width;
- sync_type = BCM2835_DMA_S_DREQ;
+ if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
+ return NULL;
+ src = c->cfg.src_addr;
+ info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC;
} else {
- dev_addr = c->cfg.dst_addr;
- dev_width = c->cfg.dst_addr_width;
- sync_type = BCM2835_DMA_D_DREQ;
+ if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
+ return NULL;
+ dst = c->cfg.dst_addr;
+ info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC;
}
- /* Bus width translates to the element size (ES) */
- switch (dev_width) {
- case DMA_SLAVE_BUSWIDTH_4_BYTES:
- es = BCM2835_DMA_DATA_TYPE_S32;
- break;
- default:
- return NULL;
- }
+ /* count frames in sg list */
+ frames = bcm2835_dma_count_frames_for_sg(c, sgl, sg_len);
- /* Now allocate and setup the descriptor. */
- d = kzalloc(sizeof(*d), GFP_NOWAIT);
+ /* allocate the CB chain */
+ d = bcm2835_dma_create_cb_chain(chan, direction, false,
+ info, extra,
+ frames, src, dst, 0, 0,
+ GFP_KERNEL);
if (!d)
return NULL;
- d->c = c;
- d->dir = direction;
- d->frames = buf_len / period_len;
+ /* fill in frames with scatterlist pointers */
+ bcm2835_dma_fill_cb_chain_with_sg(chan, direction, d->cb_list,
+ sgl, sg_len);
- d->cb_list = kcalloc(d->frames, sizeof(*d->cb_list), GFP_KERNEL);
- if (!d->cb_list) {
- kfree(d);
+ return vchan_tx_prep(&c->vc, &d->vd, flags);
+}
+
+static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic(
+ struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
+ size_t period_len, enum dma_transfer_direction direction,
+ unsigned long flags)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+ struct bcm2835_desc *d;
+ dma_addr_t src, dst;
+ u32 info = BCM2835_DMA_WAIT_RESP;
+ u32 extra = BCM2835_DMA_INT_EN;
+ size_t max_len = bcm2835_dma_max_frame_length(c);
+ size_t frames;
+
+ /* Grab configuration */
+ if (!is_slave_direction(direction)) {
+ dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
return NULL;
}
- /* Allocate memory for control blocks */
- for (i = 0; i < d->frames; i++) {
- struct bcm2835_cb_entry *cb_entry = &d->cb_list[i];
- cb_entry->cb = dma_pool_zalloc(c->cb_pool, GFP_ATOMIC,
- &cb_entry->paddr);
- if (!cb_entry->cb)
- goto error_cb;
+ if (!buf_len) {
+ dev_err(chan->device->dev,
+ "%s: bad buffer length (= 0)\n", __func__);
+ return NULL;
}
/*
- * Iterate over all frames, create a control block
- * for each frame and link them together.
+ * warn if buf_len is not a multiple of period_len - this may leed
+ * to unexpected latencies for interrupts and thus audiable clicks
*/
- for (frame = 0; frame < d->frames; frame++) {
- struct bcm2835_dma_cb *control_block = d->cb_list[frame].cb;
-
- /* Setup adresses */
- if (d->dir == DMA_DEV_TO_MEM) {
- control_block->info = BCM2835_DMA_D_INC;
- control_block->src = dev_addr;
- control_block->dst = buf_addr + frame * period_len;
- } else {
- control_block->info = BCM2835_DMA_S_INC;
- control_block->src = buf_addr + frame * period_len;
- control_block->dst = dev_addr;
- }
+ if (buf_len % period_len)
+ dev_warn_once(chan->device->dev,
+ "%s: buffer_length (%zd) is not a multiple of period_len (%zd)\n",
+ __func__, buf_len, period_len);
- /* Enable interrupt */
- control_block->info |= BCM2835_DMA_INT_EN;
+ /* Setup DREQ channel */
+ if (c->dreq != 0)
+ info |= BCM2835_DMA_PER_MAP(c->dreq);
- /* Setup synchronization */
- if (sync_type != 0)
- control_block->info |= sync_type;
+ if (direction == DMA_DEV_TO_MEM) {
+ if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
+ return NULL;
+ src = c->cfg.src_addr;
+ dst = buf_addr;
+ info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC;
+ } else {
+ if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
+ return NULL;
+ dst = c->cfg.dst_addr;
+ src = buf_addr;
+ info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC;
+ }
- /* Setup DREQ channel */
- if (c->dreq != 0)
- control_block->info |=
- BCM2835_DMA_PER_MAP(c->dreq);
+ /* calculate number of frames */
+ frames = /* number of periods */
+ DIV_ROUND_UP(buf_len, period_len) *
+ /* number of frames per period */
+ bcm2835_dma_frames_for_length(period_len, max_len);
- /* Length of a frame */
- control_block->length = period_len;
- d->size += control_block->length;
+ /*
+ * allocate the CB chain
+ * note that we need to use GFP_NOWAIT, as the ALSA i2s dmaengine
+ * implementation calls prep_dma_cyclic with interrupts disabled.
+ */
+ d = bcm2835_dma_create_cb_chain(chan, direction, true,
+ info, extra,
+ frames, src, dst, buf_len,
+ period_len, GFP_NOWAIT);
+ if (!d)
+ return NULL;
- /*
- * Next block is the next frame.
- * This DMA engine driver currently only supports cyclic DMA.
- * Therefore, wrap around at number of frames.
- */
- control_block->next = d->cb_list[((frame + 1) % d->frames)].paddr;
- }
+ /* wrap around into a loop */
+ d->cb_list[d->frames - 1].cb->next = d->cb_list[0].paddr;
return vchan_tx_prep(&c->vc, &d->vd, flags);
-error_cb:
- i--;
- for (; i >= 0; i--) {
- struct bcm2835_cb_entry *cb_entry = &d->cb_list[i];
-
- dma_pool_free(c->cb_pool, cb_entry->cb, cb_entry->paddr);
- }
-
- kfree(d->cb_list);
- kfree(d);
- return NULL;
}
static int bcm2835_dma_slave_config(struct dma_chan *chan,
@@ -529,7 +832,8 @@ static int bcm2835_dma_terminate_all(struct dma_chan *chan)
return 0;
}
-static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id, int irq)
+static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id,
+ int irq, unsigned int irq_flags)
{
struct bcm2835_chan *c;
@@ -544,6 +848,12 @@ static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id, int irq)
c->chan_base = BCM2835_DMA_CHANIO(d->base, chan_id);
c->ch = chan_id;
c->irq_number = irq;
+ c->irq_flags = irq_flags;
+
+ /* check in DEBUG register if this is a LITE channel */
+ if (readl(c->chan_base + BCM2835_DMA_DEBUG) &
+ BCM2835_DMA_DEBUG_LITE)
+ c->is_lite_channel = true;
return 0;
}
@@ -587,9 +897,11 @@ static int bcm2835_dma_probe(struct platform_device *pdev)
struct resource *res;
void __iomem *base;
int rc;
- int i;
- int irq;
+ int i, j;
+ int irq[BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED + 1];
+ int irq_flags;
uint32_t chans_available;
+ char chan_name[BCM2835_DMA_CHAN_NAME_SIZE];
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
@@ -615,16 +927,22 @@ static int bcm2835_dma_probe(struct platform_device *pdev)
dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
dma_cap_set(DMA_PRIVATE, od->ddev.cap_mask);
dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask);
+ dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
+ dma_cap_set(DMA_MEMCPY, od->ddev.cap_mask);
od->ddev.device_alloc_chan_resources = bcm2835_dma_alloc_chan_resources;
od->ddev.device_free_chan_resources = bcm2835_dma_free_chan_resources;
od->ddev.device_tx_status = bcm2835_dma_tx_status;
od->ddev.device_issue_pending = bcm2835_dma_issue_pending;
od->ddev.device_prep_dma_cyclic = bcm2835_dma_prep_dma_cyclic;
+ od->ddev.device_prep_slave_sg = bcm2835_dma_prep_slave_sg;
+ od->ddev.device_prep_dma_memcpy = bcm2835_dma_prep_dma_memcpy;
od->ddev.device_config = bcm2835_dma_slave_config;
od->ddev.device_terminate_all = bcm2835_dma_terminate_all;
od->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
od->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
- od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
+ BIT(DMA_MEM_TO_MEM);
+ od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
od->ddev.dev = &pdev->dev;
INIT_LIST_HEAD(&od->ddev.channels);
spin_lock_init(&od->lock);
@@ -640,22 +958,48 @@ static int bcm2835_dma_probe(struct platform_device *pdev)
goto err_no_dma;
}
- /*
- * Do not use the FIQ and BULK channels,
- * because they are used by the GPU.
- */
- chans_available &= ~(BCM2835_DMA_FIQ_MASK | BCM2835_DMA_BULK_MASK);
+ /* get irqs for each channel that we support */
+ for (i = 0; i <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; i++) {
+ /* skip masked out channels */
+ if (!(chans_available & (1 << i))) {
+ irq[i] = -1;
+ continue;
+ }
- for (i = 0; i < pdev->num_resources; i++) {
- irq = platform_get_irq(pdev, i);
- if (irq < 0)
- break;
+ /* get the named irq */
+ snprintf(chan_name, sizeof(chan_name), "dma%i", i);
+ irq[i] = platform_get_irq_byname(pdev, chan_name);
+ if (irq[i] >= 0)
+ continue;
- if (chans_available & (1 << i)) {
- rc = bcm2835_dma_chan_init(od, i, irq);
- if (rc)
- goto err_no_dma;
- }
+ /* legacy device tree case handling */
+ dev_warn_once(&pdev->dev,
+ "missing interrupt-names property in device tree - legacy interpretation is used\n");
+ /*
+ * in case of channel >= 11
+ * use the 11th interrupt and that is shared
+ */
+ irq[i] = platform_get_irq(pdev, i < 11 ? i : 11);
+ }
+
+ /* get irqs for each channel */
+ for (i = 0; i <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; i++) {
+ /* skip channels without irq */
+ if (irq[i] < 0)
+ continue;
+
+ /* check if there are other channels that also use this irq */
+ irq_flags = 0;
+ for (j = 0; j <= BCM2835_DMA_MAX_DMA_CHAN_SUPPORTED; j++)
+ if ((i != j) && (irq[j] == irq[i])) {
+ irq_flags = IRQF_SHARED;
+ break;
+ }
+
+ /* initialize the channel */
+ rc = bcm2835_dma_chan_init(od, i, irq[i], irq_flags);
+ if (rc)
+ goto err_no_dma;
}
dev_dbg(&pdev->dev, "Initialized %i DMA channels\n", i);
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 0cb259c59916..8c9f45fd55fc 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -289,7 +289,7 @@ enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
do {
status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
- pr_err("%s: timeout!\n", __func__);
+ dev_err(chan->device->dev, "%s: timeout!\n", __func__);
return DMA_ERROR;
}
if (status != DMA_IN_PROGRESS)
@@ -482,7 +482,8 @@ int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps)
device = chan->device;
/* check if the channel supports slave transactions */
- if (!test_bit(DMA_SLAVE, device->cap_mask.bits))
+ if (!(test_bit(DMA_SLAVE, device->cap_mask.bits) ||
+ test_bit(DMA_CYCLIC, device->cap_mask.bits)))
return -ENXIO;
/*
@@ -518,7 +519,7 @@ static struct dma_chan *private_candidate(const dma_cap_mask_t *mask,
struct dma_chan *chan;
if (mask && !__dma_device_satisfies_mask(dev, mask)) {
- pr_debug("%s: wrong capabilities\n", __func__);
+ dev_dbg(dev->dev, "%s: wrong capabilities\n", __func__);
return NULL;
}
/* devices with multiple channels need special handling as we need to
@@ -533,12 +534,12 @@ static struct dma_chan *private_candidate(const dma_cap_mask_t *mask,
list_for_each_entry(chan, &dev->channels, device_node) {
if (chan->client_count) {
- pr_debug("%s: %s busy\n",
+ dev_dbg(dev->dev, "%s: %s busy\n",
__func__, dma_chan_name(chan));
continue;
}
if (fn && !fn(chan, fn_param)) {
- pr_debug("%s: %s filter said false\n",
+ dev_dbg(dev->dev, "%s: %s filter said false\n",
__func__, dma_chan_name(chan));
continue;
}
@@ -567,11 +568,12 @@ static struct dma_chan *find_candidate(struct dma_device *device,
if (err) {
if (err == -ENODEV) {
- pr_debug("%s: %s module removed\n", __func__,
- dma_chan_name(chan));
+ dev_dbg(device->dev, "%s: %s module removed\n",
+ __func__, dma_chan_name(chan));
list_del_rcu(&device->global_node);
} else
- pr_debug("%s: failed to get %s: (%d)\n",
+ dev_dbg(device->dev,
+ "%s: failed to get %s: (%d)\n",
__func__, dma_chan_name(chan), err);
if (--device->privatecnt == 0)
@@ -602,7 +604,8 @@ struct dma_chan *dma_get_slave_channel(struct dma_chan *chan)
device->privatecnt++;
err = dma_chan_get(chan);
if (err) {
- pr_debug("%s: failed to get %s: (%d)\n",
+ dev_dbg(chan->device->dev,
+ "%s: failed to get %s: (%d)\n",
__func__, dma_chan_name(chan), err);
chan = NULL;
if (--device->privatecnt == 0)
@@ -814,8 +817,9 @@ void dmaengine_get(void)
list_del_rcu(&device->global_node);
break;
} else if (err)
- pr_debug("%s: failed to get %s: (%d)\n",
- __func__, dma_chan_name(chan), err);
+ dev_dbg(chan->device->dev,
+ "%s: failed to get %s: (%d)\n",
+ __func__, dma_chan_name(chan), err);
}
}
@@ -862,12 +866,12 @@ static bool device_has_all_tx_types(struct dma_device *device)
return false;
#endif
- #if defined(CONFIG_ASYNC_MEMCPY) || defined(CONFIG_ASYNC_MEMCPY_MODULE)
+ #if IS_ENABLED(CONFIG_ASYNC_MEMCPY)
if (!dma_has_cap(DMA_MEMCPY, device->cap_mask))
return false;
#endif
- #if defined(CONFIG_ASYNC_XOR) || defined(CONFIG_ASYNC_XOR_MODULE)
+ #if IS_ENABLED(CONFIG_ASYNC_XOR)
if (!dma_has_cap(DMA_XOR, device->cap_mask))
return false;
@@ -877,7 +881,7 @@ static bool device_has_all_tx_types(struct dma_device *device)
#endif
#endif
- #if defined(CONFIG_ASYNC_PQ) || defined(CONFIG_ASYNC_PQ_MODULE)
+ #if IS_ENABLED(CONFIG_ASYNC_PQ)
if (!dma_has_cap(DMA_PQ, device->cap_mask))
return false;
@@ -1222,8 +1226,9 @@ dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
while (tx->cookie == -EBUSY) {
if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
- pr_err("%s timeout waiting for descriptor submission\n",
- __func__);
+ dev_err(tx->chan->device->dev,
+ "%s timeout waiting for descriptor submission\n",
+ __func__);
return DMA_ERROR;
}
cpu_relax();
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 97199b3c25a2..edf053f73a49 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -45,22 +45,19 @@
DW_DMA_MSIZE_16; \
u8 _dmsize = _is_slave ? _sconfig->dst_maxburst : \
DW_DMA_MSIZE_16; \
+ u8 _dms = (_dwc->direction == DMA_MEM_TO_DEV) ? \
+ _dwc->p_master : _dwc->m_master; \
+ u8 _sms = (_dwc->direction == DMA_DEV_TO_MEM) ? \
+ _dwc->p_master : _dwc->m_master; \
\
(DWC_CTLL_DST_MSIZE(_dmsize) \
| DWC_CTLL_SRC_MSIZE(_smsize) \
| DWC_CTLL_LLP_D_EN \
| DWC_CTLL_LLP_S_EN \
- | DWC_CTLL_DMS(_dwc->dst_master) \
- | DWC_CTLL_SMS(_dwc->src_master)); \
+ | DWC_CTLL_DMS(_dms) \
+ | DWC_CTLL_SMS(_sms)); \
})
-/*
- * Number of descriptors to allocate for each channel. This should be
- * made configurable somehow; preferably, the clients (at least the
- * ones using slave transfers) should be able to give us a hint.
- */
-#define NR_DESCS_PER_CHANNEL 64
-
/* The set of bus widths supported by the DMA controller */
#define DW_DMA_BUSWIDTHS \
BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
@@ -80,51 +77,65 @@ static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc)
return to_dw_desc(dwc->active_list.next);
}
-static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
+static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx)
{
- struct dw_desc *desc, *_desc;
- struct dw_desc *ret = NULL;
- unsigned int i = 0;
- unsigned long flags;
+ struct dw_desc *desc = txd_to_dw_desc(tx);
+ struct dw_dma_chan *dwc = to_dw_dma_chan(tx->chan);
+ dma_cookie_t cookie;
+ unsigned long flags;
spin_lock_irqsave(&dwc->lock, flags);
- list_for_each_entry_safe(desc, _desc, &dwc->free_list, desc_node) {
- i++;
- if (async_tx_test_ack(&desc->txd)) {
- list_del(&desc->desc_node);
- ret = desc;
- break;
- }
- dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc);
- }
+ cookie = dma_cookie_assign(tx);
+
+ /*
+ * REVISIT: We should attempt to chain as many descriptors as
+ * possible, perhaps even appending to those already submitted
+ * for DMA. But this is hard to do in a race-free manner.
+ */
+
+ list_add_tail(&desc->desc_node, &dwc->queue);
spin_unlock_irqrestore(&dwc->lock, flags);
+ dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n",
+ __func__, desc->txd.cookie);
- dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i);
+ return cookie;
+}
- return ret;
+static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
+{
+ struct dw_dma *dw = to_dw_dma(dwc->chan.device);
+ struct dw_desc *desc;
+ dma_addr_t phys;
+
+ desc = dma_pool_zalloc(dw->desc_pool, GFP_ATOMIC, &phys);
+ if (!desc)
+ return NULL;
+
+ dwc->descs_allocated++;
+ INIT_LIST_HEAD(&desc->tx_list);
+ dma_async_tx_descriptor_init(&desc->txd, &dwc->chan);
+ desc->txd.tx_submit = dwc_tx_submit;
+ desc->txd.flags = DMA_CTRL_ACK;
+ desc->txd.phys = phys;
+ return desc;
}
-/*
- * Move a descriptor, including any children, to the free list.
- * `desc' must not be on any lists.
- */
static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc)
{
- unsigned long flags;
+ struct dw_dma *dw = to_dw_dma(dwc->chan.device);
+ struct dw_desc *child, *_next;
- if (desc) {
- struct dw_desc *child;
+ if (unlikely(!desc))
+ return;
- spin_lock_irqsave(&dwc->lock, flags);
- list_for_each_entry(child, &desc->tx_list, desc_node)
- dev_vdbg(chan2dev(&dwc->chan),
- "moving child desc %p to freelist\n",
- child);
- list_splice_init(&desc->tx_list, &dwc->free_list);
- dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc);
- list_add(&desc->desc_node, &dwc->free_list);
- spin_unlock_irqrestore(&dwc->lock, flags);
+ list_for_each_entry_safe(child, _next, &desc->tx_list, desc_node) {
+ list_del(&child->desc_node);
+ dma_pool_free(dw->desc_pool, child, child->txd.phys);
+ dwc->descs_allocated--;
}
+
+ dma_pool_free(dw->desc_pool, desc, desc->txd.phys);
+ dwc->descs_allocated--;
}
static void dwc_initialize(struct dw_dma_chan *dwc)
@@ -133,7 +144,7 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
u32 cfghi = DWC_CFGH_FIFO_MODE;
u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority);
- if (dwc->initialized == true)
+ if (test_bit(DW_DMA_IS_INITIALIZED, &dwc->flags))
return;
cfghi |= DWC_CFGH_DST_PER(dwc->dst_id);
@@ -146,26 +157,11 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
channel_set_bit(dw, MASK.XFER, dwc->mask);
channel_set_bit(dw, MASK.ERROR, dwc->mask);
- dwc->initialized = true;
+ set_bit(DW_DMA_IS_INITIALIZED, &dwc->flags);
}
/*----------------------------------------------------------------------*/
-static inline unsigned int dwc_fast_ffs(unsigned long long v)
-{
- /*
- * We can be a lot more clever here, but this should take care
- * of the most common optimization.
- */
- if (!(v & 7))
- return 3;
- else if (!(v & 3))
- return 2;
- else if (!(v & 1))
- return 1;
- return 0;
-}
-
static inline void dwc_dump_chan_regs(struct dw_dma_chan *dwc)
{
dev_err(chan2dev(&dwc->chan),
@@ -197,12 +193,12 @@ static inline void dwc_do_single_block(struct dw_dma_chan *dwc,
* Software emulation of LLP mode relies on interrupts to continue
* multi block transfer.
*/
- ctllo = desc->lli.ctllo | DWC_CTLL_INT_EN;
+ ctllo = lli_read(desc, ctllo) | DWC_CTLL_INT_EN;
- channel_writel(dwc, SAR, desc->lli.sar);
- channel_writel(dwc, DAR, desc->lli.dar);
+ channel_writel(dwc, SAR, lli_read(desc, sar));
+ channel_writel(dwc, DAR, lli_read(desc, dar));
channel_writel(dwc, CTL_LO, ctllo);
- channel_writel(dwc, CTL_HI, desc->lli.ctlhi);
+ channel_writel(dwc, CTL_HI, lli_read(desc, ctlhi));
channel_set_bit(dw, CH_EN, dwc->mask);
/* Move pointer to next descriptor */
@@ -213,6 +209,7 @@ static inline void dwc_do_single_block(struct dw_dma_chan *dwc,
static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
+ u8 lms = DWC_LLP_LMS(dwc->m_master);
unsigned long was_soft_llp;
/* ASSERT: channel is idle */
@@ -237,7 +234,7 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
dwc_initialize(dwc);
- dwc->residue = first->total_len;
+ first->residue = first->total_len;
dwc->tx_node_active = &first->tx_list;
/* Submit first block */
@@ -248,9 +245,8 @@ static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
dwc_initialize(dwc);
- channel_writel(dwc, LLP, first->txd.phys);
- channel_writel(dwc, CTL_LO,
- DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
+ channel_writel(dwc, LLP, first->txd.phys | lms);
+ channel_writel(dwc, CTL_LO, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
channel_writel(dwc, CTL_HI, 0);
channel_set_bit(dw, CH_EN, dwc->mask);
}
@@ -293,11 +289,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc,
list_for_each_entry(child, &desc->tx_list, desc_node)
async_tx_ack(&child->txd);
async_tx_ack(&desc->txd);
-
- list_splice_init(&desc->tx_list, &dwc->free_list);
- list_move(&desc->desc_node, &dwc->free_list);
-
- dma_descriptor_unmap(txd);
+ dwc_desc_put(dwc, desc);
spin_unlock_irqrestore(&dwc->lock, flags);
if (callback)
@@ -368,11 +360,11 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
head = &desc->tx_list;
if (active != head) {
- /* Update desc to reflect last sent one */
- if (active != head->next)
- desc = to_dw_desc(active->prev);
-
- dwc->residue -= desc->len;
+ /* Update residue to reflect last sent descriptor */
+ if (active == head->next)
+ desc->residue -= desc->len;
+ else
+ desc->residue -= to_dw_desc(active->prev)->len;
child = to_dw_desc(active);
@@ -387,8 +379,6 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags);
}
- dwc->residue = 0;
-
spin_unlock_irqrestore(&dwc->lock, flags);
dwc_complete_all(dw, dwc);
@@ -396,7 +386,6 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
}
if (list_empty(&dwc->active_list)) {
- dwc->residue = 0;
spin_unlock_irqrestore(&dwc->lock, flags);
return;
}
@@ -411,31 +400,31 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {
/* Initial residue value */
- dwc->residue = desc->total_len;
+ desc->residue = desc->total_len;
/* Check first descriptors addr */
- if (desc->txd.phys == llp) {
+ if (desc->txd.phys == DWC_LLP_LOC(llp)) {
spin_unlock_irqrestore(&dwc->lock, flags);
return;
}
/* Check first descriptors llp */
- if (desc->lli.llp == llp) {
+ if (lli_read(desc, llp) == llp) {
/* This one is currently in progress */
- dwc->residue -= dwc_get_sent(dwc);
+ desc->residue -= dwc_get_sent(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
return;
}
- dwc->residue -= desc->len;
+ desc->residue -= desc->len;
list_for_each_entry(child, &desc->tx_list, desc_node) {
- if (child->lli.llp == llp) {
+ if (lli_read(child, llp) == llp) {
/* Currently in progress */
- dwc->residue -= dwc_get_sent(dwc);
+ desc->residue -= dwc_get_sent(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
return;
}
- dwc->residue -= child->len;
+ desc->residue -= child->len;
}
/*
@@ -457,10 +446,14 @@ static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc)
spin_unlock_irqrestore(&dwc->lock, flags);
}
-static inline void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli)
+static inline void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_desc *desc)
{
dev_crit(chan2dev(&dwc->chan), " desc: s0x%x d0x%x l0x%x c0x%x:%x\n",
- lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo);
+ lli_read(desc, sar),
+ lli_read(desc, dar),
+ lli_read(desc, llp),
+ lli_read(desc, ctlhi),
+ lli_read(desc, ctllo));
}
static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
@@ -496,9 +489,9 @@ static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc)
*/
dev_WARN(chan2dev(&dwc->chan), "Bad descriptor submitted for DMA!\n"
" cookie: %d\n", bad_desc->txd.cookie);
- dwc_dump_lli(dwc, &bad_desc->lli);
+ dwc_dump_lli(dwc, bad_desc);
list_for_each_entry(child, &bad_desc->tx_list, desc_node)
- dwc_dump_lli(dwc, &child->lli);
+ dwc_dump_lli(dwc, child);
spin_unlock_irqrestore(&dwc->lock, flags);
@@ -549,7 +542,7 @@ static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc,
*/
if (unlikely(status_err & dwc->mask) ||
unlikely(status_xfer & dwc->mask)) {
- int i;
+ unsigned int i;
dev_err(chan2dev(&dwc->chan),
"cyclic DMA unexpected %s interrupt, stopping DMA transfer\n",
@@ -571,7 +564,7 @@ static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc,
dma_writel(dw, CLEAR.XFER, dwc->mask);
for (i = 0; i < dwc->cdesc->periods; i++)
- dwc_dump_lli(dwc, &dwc->cdesc->desc[i]->lli);
+ dwc_dump_lli(dwc, dwc->cdesc->desc[i]);
spin_unlock_irqrestore(&dwc->lock, flags);
}
@@ -589,7 +582,7 @@ static void dw_dma_tasklet(unsigned long data)
u32 status_block;
u32 status_xfer;
u32 status_err;
- int i;
+ unsigned int i;
status_block = dma_readl(dw, RAW.BLOCK);
status_xfer = dma_readl(dw, RAW.XFER);
@@ -658,30 +651,6 @@ static irqreturn_t dw_dma_interrupt(int irq, void *dev_id)
/*----------------------------------------------------------------------*/
-static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx)
-{
- struct dw_desc *desc = txd_to_dw_desc(tx);
- struct dw_dma_chan *dwc = to_dw_dma_chan(tx->chan);
- dma_cookie_t cookie;
- unsigned long flags;
-
- spin_lock_irqsave(&dwc->lock, flags);
- cookie = dma_cookie_assign(tx);
-
- /*
- * REVISIT: We should attempt to chain as many descriptors as
- * possible, perhaps even appending to those already submitted
- * for DMA. But this is hard to do in a race-free manner.
- */
-
- dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n", __func__, desc->txd.cookie);
- list_add_tail(&desc->desc_node, &dwc->queue);
-
- spin_unlock_irqrestore(&dwc->lock, flags);
-
- return cookie;
-}
-
static struct dma_async_tx_descriptor *
dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
@@ -693,10 +662,12 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
struct dw_desc *prev;
size_t xfer_count;
size_t offset;
+ u8 m_master = dwc->m_master;
unsigned int src_width;
unsigned int dst_width;
- unsigned int data_width;
+ unsigned int data_width = dw->pdata->data_width[m_master];
u32 ctllo;
+ u8 lms = DWC_LLP_LMS(m_master);
dev_vdbg(chan2dev(chan),
"%s: d%pad s%pad l0x%zx f0x%lx\n", __func__,
@@ -709,11 +680,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
dwc->direction = DMA_MEM_TO_MEM;
- data_width = min_t(unsigned int, dw->data_width[dwc->src_master],
- dw->data_width[dwc->dst_master]);
-
- src_width = dst_width = min_t(unsigned int, data_width,
- dwc_fast_ffs(src | dest | len));
+ src_width = dst_width = __ffs(data_width | src | dest | len);
ctllo = DWC_DEFAULT_CTLLO(chan)
| DWC_CTLL_DST_WIDTH(dst_width)
@@ -731,27 +698,27 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
if (!desc)
goto err_desc_get;
- desc->lli.sar = src + offset;
- desc->lli.dar = dest + offset;
- desc->lli.ctllo = ctllo;
- desc->lli.ctlhi = xfer_count;
+ lli_write(desc, sar, src + offset);
+ lli_write(desc, dar, dest + offset);
+ lli_write(desc, ctllo, ctllo);
+ lli_write(desc, ctlhi, xfer_count);
desc->len = xfer_count << src_width;
if (!first) {
first = desc;
} else {
- prev->lli.llp = desc->txd.phys;
- list_add_tail(&desc->desc_node,
- &first->tx_list);
+ lli_write(prev, llp, desc->txd.phys | lms);
+ list_add_tail(&desc->desc_node, &first->tx_list);
}
prev = desc;
}
if (flags & DMA_PREP_INTERRUPT)
/* Trigger interrupt after last block */
- prev->lli.ctllo |= DWC_CTLL_INT_EN;
+ lli_set(prev, ctllo, DWC_CTLL_INT_EN);
prev->lli.llp = 0;
+ lli_clear(prev, ctllo, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
first->txd.flags = flags;
first->total_len = len;
@@ -773,10 +740,12 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
struct dw_desc *prev;
struct dw_desc *first;
u32 ctllo;
+ u8 m_master = dwc->m_master;
+ u8 lms = DWC_LLP_LMS(m_master);
dma_addr_t reg;
unsigned int reg_width;
unsigned int mem_width;
- unsigned int data_width;
+ unsigned int data_width = dw->pdata->data_width[m_master];
unsigned int i;
struct scatterlist *sg;
size_t total_len = 0;
@@ -802,8 +771,6 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
DWC_CTLL_FC(DW_DMA_FC_D_M2P);
- data_width = dw->data_width[dwc->src_master];
-
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
u32 len, dlen, mem;
@@ -811,17 +778,16 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
- mem_width = min_t(unsigned int,
- data_width, dwc_fast_ffs(mem | len));
+ mem_width = __ffs(data_width | mem | len);
slave_sg_todev_fill_desc:
desc = dwc_desc_get(dwc);
if (!desc)
goto err_desc_get;
- desc->lli.sar = mem;
- desc->lli.dar = reg;
- desc->lli.ctllo = ctllo | DWC_CTLL_SRC_WIDTH(mem_width);
+ lli_write(desc, sar, mem);
+ lli_write(desc, dar, reg);
+ lli_write(desc, ctllo, ctllo | DWC_CTLL_SRC_WIDTH(mem_width));
if ((len >> mem_width) > dwc->block_size) {
dlen = dwc->block_size << mem_width;
mem += dlen;
@@ -831,15 +797,14 @@ slave_sg_todev_fill_desc:
len = 0;
}
- desc->lli.ctlhi = dlen >> mem_width;
+ lli_write(desc, ctlhi, dlen >> mem_width);
desc->len = dlen;
if (!first) {
first = desc;
} else {
- prev->lli.llp = desc->txd.phys;
- list_add_tail(&desc->desc_node,
- &first->tx_list);
+ lli_write(prev, llp, desc->txd.phys | lms);
+ list_add_tail(&desc->desc_node, &first->tx_list);
}
prev = desc;
total_len += dlen;
@@ -859,8 +824,6 @@ slave_sg_todev_fill_desc:
ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
DWC_CTLL_FC(DW_DMA_FC_D_P2M);
- data_width = dw->data_width[dwc->dst_master];
-
for_each_sg(sgl, sg, sg_len, i) {
struct dw_desc *desc;
u32 len, dlen, mem;
@@ -868,17 +831,16 @@ slave_sg_todev_fill_desc:
mem = sg_dma_address(sg);
len = sg_dma_len(sg);
- mem_width = min_t(unsigned int,
- data_width, dwc_fast_ffs(mem | len));
+ mem_width = __ffs(data_width | mem | len);
slave_sg_fromdev_fill_desc:
desc = dwc_desc_get(dwc);
if (!desc)
goto err_desc_get;
- desc->lli.sar = reg;
- desc->lli.dar = mem;
- desc->lli.ctllo = ctllo | DWC_CTLL_DST_WIDTH(mem_width);
+ lli_write(desc, sar, reg);
+ lli_write(desc, dar, mem);
+ lli_write(desc, ctllo, ctllo | DWC_CTLL_DST_WIDTH(mem_width));
if ((len >> reg_width) > dwc->block_size) {
dlen = dwc->block_size << reg_width;
mem += dlen;
@@ -887,15 +849,14 @@ slave_sg_fromdev_fill_desc:
dlen = len;
len = 0;
}
- desc->lli.ctlhi = dlen >> reg_width;
+ lli_write(desc, ctlhi, dlen >> reg_width);
desc->len = dlen;
if (!first) {
first = desc;
} else {
- prev->lli.llp = desc->txd.phys;
- list_add_tail(&desc->desc_node,
- &first->tx_list);
+ lli_write(prev, llp, desc->txd.phys | lms);
+ list_add_tail(&desc->desc_node, &first->tx_list);
}
prev = desc;
total_len += dlen;
@@ -910,9 +871,10 @@ slave_sg_fromdev_fill_desc:
if (flags & DMA_PREP_INTERRUPT)
/* Trigger interrupt after last block */
- prev->lli.ctllo |= DWC_CTLL_INT_EN;
+ lli_set(prev, ctllo, DWC_CTLL_INT_EN);
prev->lli.llp = 0;
+ lli_clear(prev, ctllo, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN);
first->total_len = total_len;
return &first->txd;
@@ -937,8 +899,8 @@ bool dw_dma_filter(struct dma_chan *chan, void *param)
dwc->src_id = dws->src_id;
dwc->dst_id = dws->dst_id;
- dwc->src_master = dws->src_master;
- dwc->dst_master = dws->dst_master;
+ dwc->m_master = dws->m_master;
+ dwc->p_master = dws->p_master;
return true;
}
@@ -991,7 +953,7 @@ static int dwc_pause(struct dma_chan *chan)
while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY) && count--)
udelay(2);
- dwc->paused = true;
+ set_bit(DW_DMA_IS_PAUSED, &dwc->flags);
spin_unlock_irqrestore(&dwc->lock, flags);
@@ -1004,7 +966,7 @@ static inline void dwc_chan_resume(struct dw_dma_chan *dwc)
channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP);
- dwc->paused = false;
+ clear_bit(DW_DMA_IS_PAUSED, &dwc->flags);
}
static int dwc_resume(struct dma_chan *chan)
@@ -1012,12 +974,10 @@ static int dwc_resume(struct dma_chan *chan)
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
unsigned long flags;
- if (!dwc->paused)
- return 0;
-
spin_lock_irqsave(&dwc->lock, flags);
- dwc_chan_resume(dwc);
+ if (test_bit(DW_DMA_IS_PAUSED, &dwc->flags))
+ dwc_chan_resume(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
@@ -1053,16 +1013,37 @@ static int dwc_terminate_all(struct dma_chan *chan)
return 0;
}
-static inline u32 dwc_get_residue(struct dw_dma_chan *dwc)
+static struct dw_desc *dwc_find_desc(struct dw_dma_chan *dwc, dma_cookie_t c)
{
+ struct dw_desc *desc;
+
+ list_for_each_entry(desc, &dwc->active_list, desc_node)
+ if (desc->txd.cookie == c)
+ return desc;
+
+ return NULL;
+}
+
+static u32 dwc_get_residue(struct dw_dma_chan *dwc, dma_cookie_t cookie)
+{
+ struct dw_desc *desc;
unsigned long flags;
u32 residue;
spin_lock_irqsave(&dwc->lock, flags);
- residue = dwc->residue;
- if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags) && residue)
- residue -= dwc_get_sent(dwc);
+ desc = dwc_find_desc(dwc, cookie);
+ if (desc) {
+ if (desc == dwc_first_active(dwc)) {
+ residue = desc->residue;
+ if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags) && residue)
+ residue -= dwc_get_sent(dwc);
+ } else {
+ residue = desc->total_len;
+ }
+ } else {
+ residue = 0;
+ }
spin_unlock_irqrestore(&dwc->lock, flags);
return residue;
@@ -1083,10 +1064,12 @@ dwc_tx_status(struct dma_chan *chan,
dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
ret = dma_cookie_status(chan, cookie, txstate);
- if (ret != DMA_COMPLETE)
- dma_set_residue(txstate, dwc_get_residue(dwc));
+ if (ret == DMA_COMPLETE)
+ return ret;
+
+ dma_set_residue(txstate, dwc_get_residue(dwc, cookie));
- if (dwc->paused && ret == DMA_IN_PROGRESS)
+ if (test_bit(DW_DMA_IS_PAUSED, &dwc->flags) && ret == DMA_IN_PROGRESS)
return DMA_PAUSED;
return ret;
@@ -1107,7 +1090,7 @@ static void dwc_issue_pending(struct dma_chan *chan)
static void dw_dma_off(struct dw_dma *dw)
{
- int i;
+ unsigned int i;
dma_writel(dw, CFG, 0);
@@ -1121,7 +1104,7 @@ static void dw_dma_off(struct dw_dma *dw)
cpu_relax();
for (i = 0; i < dw->dma.chancnt; i++)
- dw->chan[i].initialized = false;
+ clear_bit(DW_DMA_IS_INITIALIZED, &dw->chan[i].flags);
}
static void dw_dma_on(struct dw_dma *dw)
@@ -1133,9 +1116,6 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct dw_dma *dw = to_dw_dma(chan->device);
- struct dw_desc *desc;
- int i;
- unsigned long flags;
dev_vdbg(chan2dev(chan), "%s\n", __func__);
@@ -1166,48 +1146,13 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
dw_dma_on(dw);
dw->in_use |= dwc->mask;
- spin_lock_irqsave(&dwc->lock, flags);
- i = dwc->descs_allocated;
- while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) {
- dma_addr_t phys;
-
- spin_unlock_irqrestore(&dwc->lock, flags);
-
- desc = dma_pool_alloc(dw->desc_pool, GFP_ATOMIC, &phys);
- if (!desc)
- goto err_desc_alloc;
-
- memset(desc, 0, sizeof(struct dw_desc));
-
- INIT_LIST_HEAD(&desc->tx_list);
- dma_async_tx_descriptor_init(&desc->txd, chan);
- desc->txd.tx_submit = dwc_tx_submit;
- desc->txd.flags = DMA_CTRL_ACK;
- desc->txd.phys = phys;
-
- dwc_desc_put(dwc, desc);
-
- spin_lock_irqsave(&dwc->lock, flags);
- i = ++dwc->descs_allocated;
- }
-
- spin_unlock_irqrestore(&dwc->lock, flags);
-
- dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
-
- return i;
-
-err_desc_alloc:
- dev_info(chan2dev(chan), "only allocated %d descriptors\n", i);
-
- return i;
+ return 0;
}
static void dwc_free_chan_resources(struct dma_chan *chan)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct dw_dma *dw = to_dw_dma(chan->device);
- struct dw_desc *desc, *_desc;
unsigned long flags;
LIST_HEAD(list);
@@ -1220,17 +1165,15 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
BUG_ON(dma_readl(to_dw_dma(chan->device), CH_EN) & dwc->mask);
spin_lock_irqsave(&dwc->lock, flags);
- list_splice_init(&dwc->free_list, &list);
- dwc->descs_allocated = 0;
/* Clear custom channel configuration */
dwc->src_id = 0;
dwc->dst_id = 0;
- dwc->src_master = 0;
- dwc->dst_master = 0;
+ dwc->m_master = 0;
+ dwc->p_master = 0;
- dwc->initialized = false;
+ clear_bit(DW_DMA_IS_INITIALIZED, &dwc->flags);
/* Disable interrupts */
channel_clear_bit(dw, MASK.XFER, dwc->mask);
@@ -1244,11 +1187,6 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
if (!dw->in_use)
dw_dma_off(dw);
- list_for_each_entry_safe(desc, _desc, &list, desc_node) {
- dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc);
- dma_pool_free(dw->desc_pool, desc, desc->txd.phys);
- }
-
dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
}
@@ -1326,6 +1264,7 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
struct dw_cyclic_desc *retval = NULL;
struct dw_desc *desc;
struct dw_desc *last = NULL;
+ u8 lms = DWC_LLP_LMS(dwc->m_master);
unsigned long was_cyclic;
unsigned int reg_width;
unsigned int periods;
@@ -1379,9 +1318,6 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
retval = ERR_PTR(-ENOMEM);
- if (periods > NR_DESCS_PER_CHANNEL)
- goto out_err;
-
cdesc = kzalloc(sizeof(struct dw_cyclic_desc), GFP_KERNEL);
if (!cdesc)
goto out_err;
@@ -1397,50 +1333,50 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
switch (direction) {
case DMA_MEM_TO_DEV:
- desc->lli.dar = sconfig->dst_addr;
- desc->lli.sar = buf_addr + (period_len * i);
- desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan)
- | DWC_CTLL_DST_WIDTH(reg_width)
- | DWC_CTLL_SRC_WIDTH(reg_width)
- | DWC_CTLL_DST_FIX
- | DWC_CTLL_SRC_INC
- | DWC_CTLL_INT_EN);
-
- desc->lli.ctllo |= sconfig->device_fc ?
- DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
- DWC_CTLL_FC(DW_DMA_FC_D_M2P);
+ lli_write(desc, dar, sconfig->dst_addr);
+ lli_write(desc, sar, buf_addr + period_len * i);
+ lli_write(desc, ctllo, (DWC_DEFAULT_CTLLO(chan)
+ | DWC_CTLL_DST_WIDTH(reg_width)
+ | DWC_CTLL_SRC_WIDTH(reg_width)
+ | DWC_CTLL_DST_FIX
+ | DWC_CTLL_SRC_INC
+ | DWC_CTLL_INT_EN));
+
+ lli_set(desc, ctllo, sconfig->device_fc ?
+ DWC_CTLL_FC(DW_DMA_FC_P_M2P) :
+ DWC_CTLL_FC(DW_DMA_FC_D_M2P));
break;
case DMA_DEV_TO_MEM:
- desc->lli.dar = buf_addr + (period_len * i);
- desc->lli.sar = sconfig->src_addr;
- desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan)
- | DWC_CTLL_SRC_WIDTH(reg_width)
- | DWC_CTLL_DST_WIDTH(reg_width)
- | DWC_CTLL_DST_INC
- | DWC_CTLL_SRC_FIX
- | DWC_CTLL_INT_EN);
-
- desc->lli.ctllo |= sconfig->device_fc ?
- DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
- DWC_CTLL_FC(DW_DMA_FC_D_P2M);
+ lli_write(desc, dar, buf_addr + period_len * i);
+ lli_write(desc, sar, sconfig->src_addr);
+ lli_write(desc, ctllo, (DWC_DEFAULT_CTLLO(chan)
+ | DWC_CTLL_SRC_WIDTH(reg_width)
+ | DWC_CTLL_DST_WIDTH(reg_width)
+ | DWC_CTLL_DST_INC
+ | DWC_CTLL_SRC_FIX
+ | DWC_CTLL_INT_EN));
+
+ lli_set(desc, ctllo, sconfig->device_fc ?
+ DWC_CTLL_FC(DW_DMA_FC_P_P2M) :
+ DWC_CTLL_FC(DW_DMA_FC_D_P2M));
break;
default:
break;
}
- desc->lli.ctlhi = (period_len >> reg_width);
+ lli_write(desc, ctlhi, period_len >> reg_width);
cdesc->desc[i] = desc;
if (last)
- last->lli.llp = desc->txd.phys;
+ lli_write(last, llp, desc->txd.phys | lms);
last = desc;
}
/* Let's make a cyclic list */
- last->lli.llp = cdesc->desc[0]->txd.phys;
+ lli_write(last, llp, cdesc->desc[0]->txd.phys | lms);
dev_dbg(chan2dev(&dwc->chan),
"cyclic prepared buf %pad len %zu period %zu periods %d\n",
@@ -1471,7 +1407,7 @@ void dw_dma_cyclic_free(struct dma_chan *chan)
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
struct dw_cyclic_desc *cdesc = dwc->cdesc;
- int i;
+ unsigned int i;
unsigned long flags;
dev_dbg(chan2dev(&dwc->chan), "%s\n", __func__);
@@ -1495,32 +1431,38 @@ void dw_dma_cyclic_free(struct dma_chan *chan)
kfree(cdesc->desc);
kfree(cdesc);
+ dwc->cdesc = NULL;
+
clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags);
}
EXPORT_SYMBOL(dw_dma_cyclic_free);
/*----------------------------------------------------------------------*/
-int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
+int dw_dma_probe(struct dw_dma_chip *chip)
{
+ struct dw_dma_platform_data *pdata;
struct dw_dma *dw;
bool autocfg = false;
unsigned int dw_params;
- unsigned int max_blk_size = 0;
+ unsigned int i;
int err;
- int i;
dw = devm_kzalloc(chip->dev, sizeof(*dw), GFP_KERNEL);
if (!dw)
return -ENOMEM;
+ dw->pdata = devm_kzalloc(chip->dev, sizeof(*dw->pdata), GFP_KERNEL);
+ if (!dw->pdata)
+ return -ENOMEM;
+
dw->regs = chip->regs;
chip->dw = dw;
pm_runtime_get_sync(chip->dev);
- if (!pdata) {
- dw_params = dma_read_byaddr(chip->regs, DW_PARAMS);
+ if (!chip->pdata) {
+ dw_params = dma_readl(dw, DW_PARAMS);
dev_dbg(chip->dev, "DW_PARAMS: 0x%08x\n", dw_params);
autocfg = dw_params >> DW_PARAMS_EN & 1;
@@ -1529,29 +1471,31 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
goto err_pdata;
}
- pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata) {
- err = -ENOMEM;
- goto err_pdata;
- }
+ /* Reassign the platform data pointer */
+ pdata = dw->pdata;
/* Get hardware configuration parameters */
pdata->nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 7) + 1;
pdata->nr_masters = (dw_params >> DW_PARAMS_NR_MASTER & 3) + 1;
for (i = 0; i < pdata->nr_masters; i++) {
pdata->data_width[i] =
- (dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3) + 2;
+ 4 << (dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3);
}
- max_blk_size = dma_readl(dw, MAX_BLK_SIZE);
+ pdata->block_size = dma_readl(dw, MAX_BLK_SIZE);
/* Fill platform data with the default values */
pdata->is_private = true;
pdata->is_memcpy = true;
pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
- } else if (pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) {
+ } else if (chip->pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) {
err = -EINVAL;
goto err_pdata;
+ } else {
+ memcpy(dw->pdata, chip->pdata, sizeof(*dw->pdata));
+
+ /* Reassign the platform data pointer */
+ pdata = dw->pdata;
}
dw->chan = devm_kcalloc(chip->dev, pdata->nr_channels, sizeof(*dw->chan),
@@ -1561,11 +1505,6 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
goto err_pdata;
}
- /* Get hardware configuration parameters */
- dw->nr_masters = pdata->nr_masters;
- for (i = 0; i < dw->nr_masters; i++)
- dw->data_width[i] = pdata->data_width[i];
-
/* Calculate all channel mask before DMA setup */
dw->all_chan_mask = (1 << pdata->nr_channels) - 1;
@@ -1612,7 +1551,6 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
INIT_LIST_HEAD(&dwc->active_list);
INIT_LIST_HEAD(&dwc->queue);
- INIT_LIST_HEAD(&dwc->free_list);
channel_clear_bit(dw, CH_EN, dwc->mask);
@@ -1620,11 +1558,9 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
/* Hardware configuration */
if (autocfg) {
- unsigned int dwc_params;
unsigned int r = DW_DMA_MAX_NR_CHANNELS - i - 1;
- void __iomem *addr = chip->regs + r * sizeof(u32);
-
- dwc_params = dma_read_byaddr(addr, DWC_PARAMS);
+ void __iomem *addr = &__dw_regs(dw)->DWC_PARAMS[r];
+ unsigned int dwc_params = dma_readl_native(addr);
dev_dbg(chip->dev, "DWC_PARAMS[%d]: 0x%08x\n", i,
dwc_params);
@@ -1635,16 +1571,15 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
* up to 0x0a for 4095.
*/
dwc->block_size =
- (4 << ((max_blk_size >> 4 * i) & 0xf)) - 1;
+ (4 << ((pdata->block_size >> 4 * i) & 0xf)) - 1;
dwc->nollp =
(dwc_params >> DWC_PARAMS_MBLK_EN & 0x1) == 0;
} else {
dwc->block_size = pdata->block_size;
/* Check if channel supports multi block transfer */
- channel_writel(dwc, LLP, 0xfffffffc);
- dwc->nollp =
- (channel_readl(dwc, LLP) & 0xfffffffc) == 0;
+ channel_writel(dwc, LLP, DWC_LLP_LOC(0xffffffff));
+ dwc->nollp = DWC_LLP_LOC(channel_readl(dwc, LLP)) == 0;
channel_writel(dwc, LLP, 0);
}
}
diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c
index 358f9689a3f5..0ae6c3b1d34e 100644
--- a/drivers/dma/dw/pci.c
+++ b/drivers/dma/dw/pci.c
@@ -17,8 +17,8 @@
static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
{
+ const struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
struct dw_dma_chip *chip;
- struct dw_dma_platform_data *pdata = (void *)pid->driver_data;
int ret;
ret = pcim_enable_device(pdev);
@@ -49,8 +49,9 @@ static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)
chip->dev = &pdev->dev;
chip->regs = pcim_iomap_table(pdev)[0];
chip->irq = pdev->irq;
+ chip->pdata = pdata;
- ret = dw_dma_probe(chip, pdata);
+ ret = dw_dma_probe(chip);
if (ret)
return ret;
diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
index 26edbe3a27ac..5bda0eb9f393 100644
--- a/drivers/dma/dw/platform.c
+++ b/drivers/dma/dw/platform.c
@@ -42,13 +42,13 @@ static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
slave.src_id = dma_spec->args[0];
slave.dst_id = dma_spec->args[0];
- slave.src_master = dma_spec->args[1];
- slave.dst_master = dma_spec->args[2];
+ slave.m_master = dma_spec->args[1];
+ slave.p_master = dma_spec->args[2];
if (WARN_ON(slave.src_id >= DW_DMA_MAX_NR_REQUESTS ||
slave.dst_id >= DW_DMA_MAX_NR_REQUESTS ||
- slave.src_master >= dw->nr_masters ||
- slave.dst_master >= dw->nr_masters))
+ slave.m_master >= dw->pdata->nr_masters ||
+ slave.p_master >= dw->pdata->nr_masters))
return NULL;
dma_cap_zero(cap);
@@ -66,8 +66,8 @@ static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
.dma_dev = dma_spec->dev,
.src_id = dma_spec->slave_id,
.dst_id = dma_spec->slave_id,
- .src_master = 1,
- .dst_master = 0,
+ .m_master = 0,
+ .p_master = 1,
};
return dw_dma_filter(chan, &slave);
@@ -103,6 +103,7 @@ dw_dma_parse_dt(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct dw_dma_platform_data *pdata;
u32 tmp, arr[DW_DMA_MAX_NR_MASTERS];
+ u32 nr_masters;
u32 nr_channels;
if (!np) {
@@ -110,6 +111,11 @@ dw_dma_parse_dt(struct platform_device *pdev)
return NULL;
}
+ if (of_property_read_u32(np, "dma-masters", &nr_masters))
+ return NULL;
+ if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
+ return NULL;
+
if (of_property_read_u32(np, "dma-channels", &nr_channels))
return NULL;
@@ -117,6 +123,7 @@ dw_dma_parse_dt(struct platform_device *pdev)
if (!pdata)
return NULL;
+ pdata->nr_masters = nr_masters;
pdata->nr_channels = nr_channels;
if (of_property_read_bool(np, "is_private"))
@@ -131,17 +138,13 @@ dw_dma_parse_dt(struct platform_device *pdev)
if (!of_property_read_u32(np, "block_size", &tmp))
pdata->block_size = tmp;
- if (!of_property_read_u32(np, "dma-masters", &tmp)) {
- if (tmp > DW_DMA_MAX_NR_MASTERS)
- return NULL;
-
- pdata->nr_masters = tmp;
- }
-
- if (!of_property_read_u32_array(np, "data_width", arr,
- pdata->nr_masters))
- for (tmp = 0; tmp < pdata->nr_masters; tmp++)
+ if (!of_property_read_u32_array(np, "data-width", arr, nr_masters)) {
+ for (tmp = 0; tmp < nr_masters; tmp++)
pdata->data_width[tmp] = arr[tmp];
+ } else if (!of_property_read_u32_array(np, "data_width", arr, nr_masters)) {
+ for (tmp = 0; tmp < nr_masters; tmp++)
+ pdata->data_width[tmp] = BIT(arr[tmp] & 0x07);
+ }
return pdata;
}
@@ -158,7 +161,7 @@ static int dw_probe(struct platform_device *pdev)
struct dw_dma_chip *chip;
struct device *dev = &pdev->dev;
struct resource *mem;
- struct dw_dma_platform_data *pdata;
+ const struct dw_dma_platform_data *pdata;
int err;
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
@@ -183,6 +186,7 @@ static int dw_probe(struct platform_device *pdev)
pdata = dw_dma_parse_dt(pdev);
chip->dev = dev;
+ chip->pdata = pdata;
chip->clk = devm_clk_get(chip->dev, "hclk");
if (IS_ERR(chip->clk))
@@ -193,7 +197,7 @@ static int dw_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
- err = dw_dma_probe(chip, pdata);
+ err = dw_dma_probe(chip);
if (err)
goto err_dw_dma_probe;
diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h
index 0a50c18d85b8..4b7bd7834046 100644
--- a/drivers/dma/dw/regs.h
+++ b/drivers/dma/dw/regs.h
@@ -114,10 +114,6 @@ struct dw_dma_regs {
#define dma_writel_native writel
#endif
-/* To access the registers in early stage of probe */
-#define dma_read_byaddr(addr, name) \
- dma_readl_native((addr) + offsetof(struct dw_dma_regs, name))
-
/* Bitfields in DW_PARAMS */
#define DW_PARAMS_NR_CHAN 8 /* number of channels */
#define DW_PARAMS_NR_MASTER 11 /* number of AHB masters */
@@ -143,6 +139,10 @@ enum dw_dma_msize {
DW_DMA_MSIZE_256,
};
+/* Bitfields in LLP */
+#define DWC_LLP_LMS(x) ((x) & 3) /* list master select */
+#define DWC_LLP_LOC(x) ((x) & ~3) /* next lli */
+
/* Bitfields in CTL_LO */
#define DWC_CTLL_INT_EN (1 << 0) /* irqs enabled? */
#define DWC_CTLL_DST_WIDTH(n) ((n)<<1) /* bytes per element */
@@ -216,6 +216,8 @@ enum dw_dma_msize {
enum dw_dmac_flags {
DW_DMA_IS_CYCLIC = 0,
DW_DMA_IS_SOFT_LLP = 1,
+ DW_DMA_IS_PAUSED = 2,
+ DW_DMA_IS_INITIALIZED = 3,
};
struct dw_dma_chan {
@@ -224,8 +226,6 @@ struct dw_dma_chan {
u8 mask;
u8 priority;
enum dma_transfer_direction direction;
- bool paused;
- bool initialized;
/* software emulation of the LLP transfers */
struct list_head *tx_node_active;
@@ -236,8 +236,6 @@ struct dw_dma_chan {
unsigned long flags;
struct list_head active_list;
struct list_head queue;
- struct list_head free_list;
- u32 residue;
struct dw_cyclic_desc *cdesc;
unsigned int descs_allocated;
@@ -249,8 +247,8 @@ struct dw_dma_chan {
/* custom slave configuration */
u8 src_id;
u8 dst_id;
- u8 src_master;
- u8 dst_master;
+ u8 m_master;
+ u8 p_master;
/* configuration passed via .device_config */
struct dma_slave_config dma_sconfig;
@@ -283,9 +281,8 @@ struct dw_dma {
u8 all_chan_mask;
u8 in_use;
- /* hardware configuration */
- unsigned char nr_masters;
- unsigned char data_width[DW_DMA_MAX_NR_MASTERS];
+ /* platform data */
+ struct dw_dma_platform_data *pdata;
};
static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)
@@ -308,32 +305,51 @@ static inline struct dw_dma *to_dw_dma(struct dma_device *ddev)
return container_of(ddev, struct dw_dma, dma);
}
+#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
+typedef __be32 __dw32;
+#else
+typedef __le32 __dw32;
+#endif
+
/* LLI == Linked List Item; a.k.a. DMA block descriptor */
struct dw_lli {
/* values that are not changed by hardware */
- u32 sar;
- u32 dar;
- u32 llp; /* chain to next lli */
- u32 ctllo;
+ __dw32 sar;
+ __dw32 dar;
+ __dw32 llp; /* chain to next lli */
+ __dw32 ctllo;
/* values that may get written back: */
- u32 ctlhi;
+ __dw32 ctlhi;
/* sstat and dstat can snapshot peripheral register state.
* silicon config may discard either or both...
*/
- u32 sstat;
- u32 dstat;
+ __dw32 sstat;
+ __dw32 dstat;
};
struct dw_desc {
/* FIRST values the hardware uses */
struct dw_lli lli;
+#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO
+#define lli_set(d, reg, v) ((d)->lli.reg |= cpu_to_be32(v))
+#define lli_clear(d, reg, v) ((d)->lli.reg &= ~cpu_to_be32(v))
+#define lli_read(d, reg) be32_to_cpu((d)->lli.reg)
+#define lli_write(d, reg, v) ((d)->lli.reg = cpu_to_be32(v))
+#else
+#define lli_set(d, reg, v) ((d)->lli.reg |= cpu_to_le32(v))
+#define lli_clear(d, reg, v) ((d)->lli.reg &= ~cpu_to_le32(v))
+#define lli_read(d, reg) le32_to_cpu((d)->lli.reg)
+#define lli_write(d, reg, v) ((d)->lli.reg = cpu_to_le32(v))
+#endif
+
/* THEN values for driver housekeeping */
struct list_head desc_node;
struct list_head tx_list;
struct dma_async_tx_descriptor txd;
size_t len;
size_t total_len;
+ u32 residue;
};
#define to_dw_desc(h) list_entry(h, struct dw_desc, desc_node)
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 04070baab78a..8181ed131386 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -1537,8 +1537,17 @@ static irqreturn_t dma_ccerr_handler(int irq, void *data)
dev_vdbg(ecc->dev, "dma_ccerr_handler\n");
- if (!edma_error_pending(ecc))
+ if (!edma_error_pending(ecc)) {
+ /*
+ * The registers indicate no pending error event but the irq
+ * handler has been called.
+ * Ask eDMA to re-evaluate the error registers.
+ */
+ dev_err(ecc->dev, "%s: Error interrupt without error event!\n",
+ __func__);
+ edma_write(ecc, EDMA_EEVAL, 1);
return IRQ_NONE;
+ }
while (1) {
/* Event missed register(s) */
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index aac85c30c2cf..a8828ed639b3 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -462,13 +462,12 @@ static struct fsl_desc_sw *fsl_dma_alloc_descriptor(struct fsldma_chan *chan)
struct fsl_desc_sw *desc;
dma_addr_t pdesc;
- desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
+ desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
if (!desc) {
chan_dbg(chan, "out of memory for link descriptor\n");
return NULL;
}
- memset(desc, 0, sizeof(*desc));
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
desc->async_tx.tx_submit = fsl_dma_tx_submit;
diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c
index ee510515ce18..f8c5cd53307c 100644
--- a/drivers/dma/hsu/hsu.c
+++ b/drivers/dma/hsu/hsu.c
@@ -77,8 +77,8 @@ static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc)
hsu_chan_writel(hsuc, HSU_CH_MTSR, mtsr);
/* Set descriptors */
- count = (desc->nents - desc->active) % HSU_DMA_CHAN_NR_DESC;
- for (i = 0; i < count; i++) {
+ count = desc->nents - desc->active;
+ for (i = 0; i < count && i < HSU_DMA_CHAN_NR_DESC; i++) {
hsu_chan_writel(hsuc, HSU_CH_DxSAR(i), desc->sg[i].addr);
hsu_chan_writel(hsuc, HSU_CH_DxTSR(i), desc->sg[i].len);
@@ -160,7 +160,7 @@ irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr)
return IRQ_NONE;
/* Timeout IRQ, need wait some time, see Errata 2 */
- if (hsuc->direction == DMA_DEV_TO_MEM && (sr & HSU_CH_SR_DESCTO_ANY))
+ if (sr & HSU_CH_SR_DESCTO_ANY)
udelay(2);
sr &= ~HSU_CH_SR_DESCTO_ANY;
@@ -420,6 +420,8 @@ int hsu_dma_probe(struct hsu_dma_chip *chip)
hsu->dma.dev = chip->dev;
+ dma_set_max_seg_size(hsu->dma.dev, HSU_CH_DxTSR_MASK);
+
ret = dma_async_device_register(&hsu->dma);
if (ret)
return ret;
diff --git a/drivers/dma/hsu/hsu.h b/drivers/dma/hsu/hsu.h
index 6b070c22b1df..486b023b3af0 100644
--- a/drivers/dma/hsu/hsu.h
+++ b/drivers/dma/hsu/hsu.h
@@ -58,6 +58,10 @@
#define HSU_CH_DCR_CHEI BIT(23)
#define HSU_CH_DCR_CHTOI(x) BIT(24 + (x))
+/* Bits in HSU_CH_DxTSR */
+#define HSU_CH_DxTSR_MASK GENMASK(15, 0)
+#define HSU_CH_DxTSR_TSR(x) ((x) & HSU_CH_DxTSR_MASK)
+
struct hsu_dma_sg {
dma_addr_t addr;
unsigned int len;
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index efdee1a69fc4..d406056e8892 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -690,12 +690,11 @@ static int ioat_alloc_chan_resources(struct dma_chan *c)
/* allocate a completion writeback area */
/* doing 2 32bit writes to mmio since 1 64b write doesn't work */
ioat_chan->completion =
- dma_pool_alloc(ioat_chan->ioat_dma->completion_pool,
- GFP_KERNEL, &ioat_chan->completion_dma);
+ dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool,
+ GFP_KERNEL, &ioat_chan->completion_dma);
if (!ioat_chan->completion)
return -ENOMEM;
- memset(ioat_chan->completion, 0, sizeof(*ioat_chan->completion));
writel(((u64)ioat_chan->completion_dma) & 0x00000000FFFFFFFF,
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
writel(((u64)ioat_chan->completion_dma) >> 32,
@@ -1074,6 +1073,7 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
struct ioatdma_chan *ioat_chan;
bool is_raid_device = false;
int err;
+ u16 val16;
dma = &ioat_dma->dma_dev;
dma->device_prep_dma_memcpy = ioat_dma_prep_memcpy_lock;
@@ -1173,6 +1173,17 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
if (dca)
ioat_dma->dca = ioat_dca_init(pdev, ioat_dma->reg_base);
+ /* disable relaxed ordering */
+ err = pcie_capability_read_word(pdev, IOAT_DEVCTRL_OFFSET, &val16);
+ if (err)
+ return err;
+
+ /* clear relaxed ordering enable */
+ val16 &= ~IOAT_DEVCTRL_ROE;
+ err = pcie_capability_write_word(pdev, IOAT_DEVCTRL_OFFSET, val16);
+ if (err)
+ return err;
+
return 0;
}
diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h
index 4994a3623aee..70534981a49b 100644
--- a/drivers/dma/ioat/registers.h
+++ b/drivers/dma/ioat/registers.h
@@ -26,6 +26,13 @@
#define IOAT_PCI_CHANERR_INT_OFFSET 0x180
#define IOAT_PCI_CHANERRMASK_INT_OFFSET 0x184
+/* PCIe config registers */
+
+/* EXPCAPID + N */
+#define IOAT_DEVCTRL_OFFSET 0x8
+/* relaxed ordering enable */
+#define IOAT_DEVCTRL_ROE 0x10
+
/* MMIO Device Registers */
#define IOAT_CHANCNT_OFFSET 0x00 /* 8-bit */
diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index e39457f13d4d..56f1fd68b620 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -364,13 +364,12 @@ mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan)
struct mmp_pdma_desc_sw *desc;
dma_addr_t pdesc;
- desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
+ desc = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &pdesc);
if (!desc) {
dev_err(chan->dev, "out of memory for link descriptor\n");
return NULL;
}
- memset(desc, 0, sizeof(*desc));
INIT_LIST_HEAD(&desc->tx_list);
dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan);
/* each desc has submit */
diff --git a/drivers/dma/mpc512x_dma.c b/drivers/dma/mpc512x_dma.c
index aae76fb39adc..ccadafa51d5e 100644
--- a/drivers/dma/mpc512x_dma.c
+++ b/drivers/dma/mpc512x_dma.c
@@ -3,6 +3,7 @@
* Copyright (C) Semihalf 2009
* Copyright (C) Ilya Yanok, Emcraft Systems 2010
* Copyright (C) Alexander Popov, Promcontroller 2014
+ * Copyright (C) Mario Six, Guntermann & Drunck GmbH, 2016
*
* Written by Piotr Ziecik <kosmo@semihalf.com>. Hardware description
* (defines, structures and comments) was taken from MPC5121 DMA driver
@@ -26,18 +27,19 @@
*/
/*
- * MPC512x and MPC8308 DMA driver. It supports
- * memory to memory data transfers (tested using dmatest module) and
- * data transfers between memory and peripheral I/O memory
- * by means of slave scatter/gather with these limitations:
- * - chunked transfers (described by s/g lists with more than one item)
- * are refused as long as proper support for scatter/gather is missing;
- * - transfers on MPC8308 always start from software as this SoC appears
- * not to have external request lines for peripheral flow control;
- * - only peripheral devices with 4-byte FIFO access register are supported;
- * - minimal memory <-> I/O memory transfer chunk is 4 bytes and consequently
- * source and destination addresses must be 4-byte aligned
- * and transfer size must be aligned on (4 * maxburst) boundary;
+ * MPC512x and MPC8308 DMA driver. It supports memory to memory data transfers
+ * (tested using dmatest module) and data transfers between memory and
+ * peripheral I/O memory by means of slave scatter/gather with these
+ * limitations:
+ * - chunked transfers (described by s/g lists with more than one item) are
+ * refused as long as proper support for scatter/gather is missing
+ * - transfers on MPC8308 always start from software as this SoC does not have
+ * external request lines for peripheral flow control
+ * - memory <-> I/O memory transfer chunks of sizes of 1, 2, 4, 16 (for
+ * MPC512x), and 32 bytes are supported, and, consequently, source
+ * addresses and destination addresses must be aligned accordingly;
+ * furthermore, for MPC512x SoCs, the transfer size must be aligned on
+ * (chunk size * maxburst)
*/
#include <linux/module.h>
@@ -213,8 +215,10 @@ struct mpc_dma_chan {
/* Settings for access to peripheral FIFO */
dma_addr_t src_per_paddr;
u32 src_tcd_nunits;
+ u8 swidth;
dma_addr_t dst_per_paddr;
u32 dst_tcd_nunits;
+ u8 dwidth;
/* Lock for this structure */
spinlock_t lock;
@@ -247,6 +251,7 @@ static inline struct mpc_dma_chan *dma_chan_to_mpc_dma_chan(struct dma_chan *c)
static inline struct mpc_dma *dma_chan_to_mpc_dma(struct dma_chan *c)
{
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(c);
+
return container_of(mchan, struct mpc_dma, channels[c->chan_id]);
}
@@ -254,9 +259,9 @@ static inline struct mpc_dma *dma_chan_to_mpc_dma(struct dma_chan *c)
* Execute all queued DMA descriptors.
*
* Following requirements must be met while calling mpc_dma_execute():
- * a) mchan->lock is acquired,
- * b) mchan->active list is empty,
- * c) mchan->queued list contains at least one entry.
+ * a) mchan->lock is acquired,
+ * b) mchan->active list is empty,
+ * c) mchan->queued list contains at least one entry.
*/
static void mpc_dma_execute(struct mpc_dma_chan *mchan)
{
@@ -446,20 +451,15 @@ static void mpc_dma_tasklet(unsigned long data)
if (es & MPC_DMA_DMAES_SAE)
dev_err(mdma->dma.dev, "- Source Address Error\n");
if (es & MPC_DMA_DMAES_SOE)
- dev_err(mdma->dma.dev, "- Source Offset"
- " Configuration Error\n");
+ dev_err(mdma->dma.dev, "- Source Offset Configuration Error\n");
if (es & MPC_DMA_DMAES_DAE)
- dev_err(mdma->dma.dev, "- Destination Address"
- " Error\n");
+ dev_err(mdma->dma.dev, "- Destination Address Error\n");
if (es & MPC_DMA_DMAES_DOE)
- dev_err(mdma->dma.dev, "- Destination Offset"
- " Configuration Error\n");
+ dev_err(mdma->dma.dev, "- Destination Offset Configuration Error\n");
if (es & MPC_DMA_DMAES_NCE)
- dev_err(mdma->dma.dev, "- NBytes/Citter"
- " Configuration Error\n");
+ dev_err(mdma->dma.dev, "- NBytes/Citter Configuration Error\n");
if (es & MPC_DMA_DMAES_SGE)
- dev_err(mdma->dma.dev, "- Scatter/Gather"
- " Configuration Error\n");
+ dev_err(mdma->dma.dev, "- Scatter/Gather Configuration Error\n");
if (es & MPC_DMA_DMAES_SBE)
dev_err(mdma->dma.dev, "- Source Bus Error\n");
if (es & MPC_DMA_DMAES_DBE)
@@ -518,8 +518,8 @@ static int mpc_dma_alloc_chan_resources(struct dma_chan *chan)
for (i = 0; i < MPC_DMA_DESCRIPTORS; i++) {
mdesc = kzalloc(sizeof(struct mpc_dma_desc), GFP_KERNEL);
if (!mdesc) {
- dev_notice(mdma->dma.dev, "Memory allocation error. "
- "Allocated only %u descriptors\n", i);
+ dev_notice(mdma->dma.dev,
+ "Memory allocation error. Allocated only %u descriptors\n", i);
break;
}
@@ -684,6 +684,15 @@ mpc_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst, dma_addr_t src,
return &mdesc->desc;
}
+inline u8 buswidth_to_dmatsize(u8 buswidth)
+{
+ u8 res;
+
+ for (res = 0; buswidth > 1; buswidth /= 2)
+ res++;
+ return res;
+}
+
static struct dma_async_tx_descriptor *
mpc_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
@@ -742,39 +751,54 @@ mpc_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
memset(tcd, 0, sizeof(struct mpc_dma_tcd));
- if (!IS_ALIGNED(sg_dma_address(sg), 4))
- goto err_prep;
-
if (direction == DMA_DEV_TO_MEM) {
tcd->saddr = per_paddr;
tcd->daddr = sg_dma_address(sg);
+
+ if (!IS_ALIGNED(sg_dma_address(sg), mchan->dwidth))
+ goto err_prep;
+
tcd->soff = 0;
- tcd->doff = 4;
+ tcd->doff = mchan->dwidth;
} else {
tcd->saddr = sg_dma_address(sg);
tcd->daddr = per_paddr;
- tcd->soff = 4;
+
+ if (!IS_ALIGNED(sg_dma_address(sg), mchan->swidth))
+ goto err_prep;
+
+ tcd->soff = mchan->swidth;
tcd->doff = 0;
}
- tcd->ssize = MPC_DMA_TSIZE_4;
- tcd->dsize = MPC_DMA_TSIZE_4;
+ tcd->ssize = buswidth_to_dmatsize(mchan->swidth);
+ tcd->dsize = buswidth_to_dmatsize(mchan->dwidth);
- len = sg_dma_len(sg);
- tcd->nbytes = tcd_nunits * 4;
- if (!IS_ALIGNED(len, tcd->nbytes))
- goto err_prep;
+ if (mdma->is_mpc8308) {
+ tcd->nbytes = sg_dma_len(sg);
+ if (!IS_ALIGNED(tcd->nbytes, mchan->swidth))
+ goto err_prep;
- iter = len / tcd->nbytes;
- if (iter >= 1 << 15) {
- /* len is too big */
- goto err_prep;
+ /* No major loops for MPC8303 */
+ tcd->biter = 1;
+ tcd->citer = 1;
+ } else {
+ len = sg_dma_len(sg);
+ tcd->nbytes = tcd_nunits * tcd->ssize;
+ if (!IS_ALIGNED(len, tcd->nbytes))
+ goto err_prep;
+
+ iter = len / tcd->nbytes;
+ if (iter >= 1 << 15) {
+ /* len is too big */
+ goto err_prep;
+ }
+ /* citer_linkch contains the high bits of iter */
+ tcd->biter = iter & 0x1ff;
+ tcd->biter_linkch = iter >> 9;
+ tcd->citer = tcd->biter;
+ tcd->citer_linkch = tcd->biter_linkch;
}
- /* citer_linkch contains the high bits of iter */
- tcd->biter = iter & 0x1ff;
- tcd->biter_linkch = iter >> 9;
- tcd->citer = tcd->biter;
- tcd->citer_linkch = tcd->biter_linkch;
tcd->e_sg = 0;
tcd->d_req = 1;
@@ -796,40 +820,62 @@ err_prep:
return NULL;
}
+inline bool is_buswidth_valid(u8 buswidth, bool is_mpc8308)
+{
+ switch (buswidth) {
+ case 16:
+ if (is_mpc8308)
+ return false;
+ case 1:
+ case 2:
+ case 4:
+ case 32:
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
static int mpc_dma_device_config(struct dma_chan *chan,
struct dma_slave_config *cfg)
{
struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan);
+ struct mpc_dma *mdma = dma_chan_to_mpc_dma(&mchan->chan);
unsigned long flags;
/*
* Software constraints:
- * - only transfers between a peripheral device and
- * memory are supported;
- * - only peripheral devices with 4-byte FIFO access register
- * are supported;
- * - minimal transfer chunk is 4 bytes and consequently
- * source and destination addresses must be 4-byte aligned
- * and transfer size must be aligned on (4 * maxburst)
- * boundary;
- * - during the transfer RAM address is being incremented by
- * the size of minimal transfer chunk;
- * - peripheral port's address is constant during the transfer.
+ * - only transfers between a peripheral device and memory are
+ * supported
+ * - transfer chunk sizes of 1, 2, 4, 16 (for MPC512x), and 32 bytes
+ * are supported, and, consequently, source addresses and
+ * destination addresses; must be aligned accordingly; furthermore,
+ * for MPC512x SoCs, the transfer size must be aligned on (chunk
+ * size * maxburst)
+ * - during the transfer, the RAM address is incremented by the size
+ * of transfer chunk
+ * - the peripheral port's address is constant during the transfer.
*/
- if (cfg->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES ||
- cfg->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES ||
- !IS_ALIGNED(cfg->src_addr, 4) ||
- !IS_ALIGNED(cfg->dst_addr, 4)) {
+ if (!IS_ALIGNED(cfg->src_addr, cfg->src_addr_width) ||
+ !IS_ALIGNED(cfg->dst_addr, cfg->dst_addr_width)) {
return -EINVAL;
}
+ if (!is_buswidth_valid(cfg->src_addr_width, mdma->is_mpc8308) ||
+ !is_buswidth_valid(cfg->dst_addr_width, mdma->is_mpc8308))
+ return -EINVAL;
+
spin_lock_irqsave(&mchan->lock, flags);
mchan->src_per_paddr = cfg->src_addr;
mchan->src_tcd_nunits = cfg->src_maxburst;
+ mchan->swidth = cfg->src_addr_width;
mchan->dst_per_paddr = cfg->dst_addr;
mchan->dst_tcd_nunits = cfg->dst_maxburst;
+ mchan->dwidth = cfg->dst_addr_width;
/* Apply defaults */
if (mchan->src_tcd_nunits == 0)
@@ -875,7 +921,6 @@ static int mpc_dma_probe(struct platform_device *op)
mdma = devm_kzalloc(dev, sizeof(struct mpc_dma), GFP_KERNEL);
if (!mdma) {
- dev_err(dev, "Memory exhausted!\n");
retval = -ENOMEM;
goto err;
}
@@ -999,7 +1044,8 @@ static int mpc_dma_probe(struct platform_device *op)
out_be32(&mdma->regs->dmaerrl, 0xFFFF);
} else {
out_be32(&mdma->regs->dmacr, MPC_DMA_DMACR_EDCG |
- MPC_DMA_DMACR_ERGA | MPC_DMA_DMACR_ERCA);
+ MPC_DMA_DMACR_ERGA |
+ MPC_DMA_DMACR_ERCA);
/* Disable hardware DMA requests */
out_be32(&mdma->regs->dmaerqh, 0);
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 3922a5d56806..25d1dadcddd1 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -31,6 +31,12 @@
#include "dmaengine.h"
#include "mv_xor.h"
+enum mv_xor_type {
+ XOR_ORION,
+ XOR_ARMADA_38X,
+ XOR_ARMADA_37XX,
+};
+
enum mv_xor_mode {
XOR_MODE_IN_REG,
XOR_MODE_IN_DESC,
@@ -477,7 +483,7 @@ mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
dev_dbg(mv_chan_to_devp(mv_chan),
- "%s src_cnt: %d len: %u dest %pad flags: %ld\n",
+ "%s src_cnt: %d len: %zu dest %pad flags: %ld\n",
__func__, src_cnt, len, &dest, flags);
sw_desc = mv_chan_alloc_slot(mv_chan);
@@ -933,7 +939,7 @@ static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan)
static struct mv_xor_chan *
mv_xor_channel_add(struct mv_xor_device *xordev,
struct platform_device *pdev,
- int idx, dma_cap_mask_t cap_mask, int irq, int op_in_desc)
+ int idx, dma_cap_mask_t cap_mask, int irq)
{
int ret = 0;
struct mv_xor_chan *mv_chan;
@@ -945,7 +951,10 @@ mv_xor_channel_add(struct mv_xor_device *xordev,
mv_chan->idx = idx;
mv_chan->irq = irq;
- mv_chan->op_in_desc = op_in_desc;
+ if (xordev->xor_type == XOR_ORION)
+ mv_chan->op_in_desc = XOR_MODE_IN_REG;
+ else
+ mv_chan->op_in_desc = XOR_MODE_IN_DESC;
dma_dev = &mv_chan->dmadev;
@@ -1085,6 +1094,33 @@ mv_xor_conf_mbus_windows(struct mv_xor_device *xordev,
writel(0, base + WINDOW_OVERRIDE_CTRL(1));
}
+static void
+mv_xor_conf_mbus_windows_a3700(struct mv_xor_device *xordev)
+{
+ void __iomem *base = xordev->xor_high_base;
+ u32 win_enable = 0;
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ writel(0, base + WINDOW_BASE(i));
+ writel(0, base + WINDOW_SIZE(i));
+ if (i < 4)
+ writel(0, base + WINDOW_REMAP_HIGH(i));
+ }
+ /*
+ * For Armada3700 open default 4GB Mbus window. The dram
+ * related configuration are done at AXIS level.
+ */
+ writel(0xffff0000, base + WINDOW_SIZE(0));
+ win_enable |= 1;
+ win_enable |= 3 << 16;
+
+ writel(win_enable, base + WINDOW_BAR_ENABLE(0));
+ writel(win_enable, base + WINDOW_BAR_ENABLE(1));
+ writel(0, base + WINDOW_OVERRIDE_CTRL(0));
+ writel(0, base + WINDOW_OVERRIDE_CTRL(1));
+}
+
/*
* Since this XOR driver is basically used only for RAID5, we don't
* need to care about synchronizing ->suspend with DMA activity,
@@ -1129,6 +1165,11 @@ static int mv_xor_resume(struct platform_device *dev)
XOR_INTR_MASK(mv_chan));
}
+ if (xordev->xor_type == XOR_ARMADA_37XX) {
+ mv_xor_conf_mbus_windows_a3700(xordev);
+ return 0;
+ }
+
dram = mv_mbus_dram_info();
if (dram)
mv_xor_conf_mbus_windows(xordev, dram);
@@ -1137,8 +1178,9 @@ static int mv_xor_resume(struct platform_device *dev)
}
static const struct of_device_id mv_xor_dt_ids[] = {
- { .compatible = "marvell,orion-xor", .data = (void *)XOR_MODE_IN_REG },
- { .compatible = "marvell,armada-380-xor", .data = (void *)XOR_MODE_IN_DESC },
+ { .compatible = "marvell,orion-xor", .data = (void *)XOR_ORION },
+ { .compatible = "marvell,armada-380-xor", .data = (void *)XOR_ARMADA_38X },
+ { .compatible = "marvell,armada-3700-xor", .data = (void *)XOR_ARMADA_37XX },
{},
};
@@ -1152,7 +1194,6 @@ static int mv_xor_probe(struct platform_device *pdev)
struct resource *res;
unsigned int max_engines, max_channels;
int i, ret;
- int op_in_desc;
dev_notice(&pdev->dev, "Marvell shared XOR driver\n");
@@ -1180,12 +1221,30 @@ static int mv_xor_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, xordev);
+
+ /*
+ * We need to know which type of XOR device we use before
+ * setting up. In non-dt case it can only be the legacy one.
+ */
+ xordev->xor_type = XOR_ORION;
+ if (pdev->dev.of_node) {
+ const struct of_device_id *of_id =
+ of_match_device(mv_xor_dt_ids,
+ &pdev->dev);
+
+ xordev->xor_type = (uintptr_t)of_id->data;
+ }
+
/*
* (Re-)program MBUS remapping windows if we are asked to.
*/
- dram = mv_mbus_dram_info();
- if (dram)
- mv_xor_conf_mbus_windows(xordev, dram);
+ if (xordev->xor_type == XOR_ARMADA_37XX) {
+ mv_xor_conf_mbus_windows_a3700(xordev);
+ } else {
+ dram = mv_mbus_dram_info();
+ if (dram)
+ mv_xor_conf_mbus_windows(xordev, dram);
+ }
/* Not all platforms can gate the clock, so it is not
* an error if the clock does not exists.
@@ -1199,12 +1258,16 @@ static int mv_xor_probe(struct platform_device *pdev)
* order for async_tx to perform well. So we limit the number
* of engines and channels so that we take into account this
* constraint. Note that we also want to use channels from
- * separate engines when possible.
+ * separate engines when possible. For dual-CPU Armada 3700
+ * SoC with single XOR engine allow using its both channels.
*/
max_engines = num_present_cpus();
- max_channels = min_t(unsigned int,
- MV_XOR_MAX_CHANNELS,
- DIV_ROUND_UP(num_present_cpus(), 2));
+ if (xordev->xor_type == XOR_ARMADA_37XX)
+ max_channels = num_present_cpus();
+ else
+ max_channels = min_t(unsigned int,
+ MV_XOR_MAX_CHANNELS,
+ DIV_ROUND_UP(num_present_cpus(), 2));
if (mv_xor_engine_count >= max_engines)
return 0;
@@ -1212,15 +1275,11 @@ static int mv_xor_probe(struct platform_device *pdev)
if (pdev->dev.of_node) {
struct device_node *np;
int i = 0;
- const struct of_device_id *of_id =
- of_match_device(mv_xor_dt_ids,
- &pdev->dev);
for_each_child_of_node(pdev->dev.of_node, np) {
struct mv_xor_chan *chan;
dma_cap_mask_t cap_mask;
int irq;
- op_in_desc = (int)of_id->data;
if (i >= max_channels)
continue;
@@ -1237,7 +1296,7 @@ static int mv_xor_probe(struct platform_device *pdev)
}
chan = mv_xor_channel_add(xordev, pdev, i,
- cap_mask, irq, op_in_desc);
+ cap_mask, irq);
if (IS_ERR(chan)) {
ret = PTR_ERR(chan);
irq_dispose_mapping(irq);
@@ -1266,8 +1325,7 @@ static int mv_xor_probe(struct platform_device *pdev)
}
chan = mv_xor_channel_add(xordev, pdev, i,
- cd->cap_mask, irq,
- XOR_MODE_IN_REG);
+ cd->cap_mask, irq);
if (IS_ERR(chan)) {
ret = PTR_ERR(chan);
goto err_channel_add;
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h
index c19fe30e5ae9..bf56e082e7cd 100644
--- a/drivers/dma/mv_xor.h
+++ b/drivers/dma/mv_xor.h
@@ -85,6 +85,7 @@ struct mv_xor_device {
void __iomem *xor_high_base;
struct clk *clk;
struct mv_xor_chan *channels[MV_XOR_MAX_CHANNELS];
+ int xor_type;
};
/**
diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 1e1f2986eba8..faae0bfe1109 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -240,8 +240,9 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
struct of_phandle_args dma_spec;
struct of_dma *ofdma;
struct dma_chan *chan;
- int count, i;
+ int count, i, start;
int ret_no_channel = -ENODEV;
+ static atomic_t last_index;
if (!np || !name) {
pr_err("%s: not enough information provided\n", __func__);
@@ -259,8 +260,15 @@ struct dma_chan *of_dma_request_slave_channel(struct device_node *np,
return ERR_PTR(-ENODEV);
}
+ /*
+ * approximate an average distribution across multiple
+ * entries with the same name
+ */
+ start = atomic_inc_return(&last_index);
for (i = 0; i < count; i++) {
- if (of_dma_match_channel(np, name, i, &dma_spec))
+ if (of_dma_match_channel(np, name,
+ (i + start) % count,
+ &dma_spec))
continue;
mutex_lock(&of_dma_lock);
diff --git a/drivers/dma/pxa_dma.c b/drivers/dma/pxa_dma.c
index 77c1c44009d8..e756a30ccba2 100644
--- a/drivers/dma/pxa_dma.c
+++ b/drivers/dma/pxa_dma.c
@@ -117,6 +117,7 @@ struct pxad_chan {
/* protected by vc->lock */
struct pxad_phy *phy;
struct dma_pool *desc_pool; /* Descriptors pool */
+ dma_cookie_t bus_error;
};
struct pxad_device {
@@ -563,6 +564,7 @@ static void pxad_launch_chan(struct pxad_chan *chan,
return;
}
}
+ chan->bus_error = 0;
/*
* Program the descriptor's address into the DMA controller,
@@ -666,6 +668,7 @@ static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
struct virt_dma_desc *vd, *tmp;
unsigned int dcsr;
unsigned long flags;
+ dma_cookie_t last_started = 0;
BUG_ON(!chan);
@@ -678,6 +681,7 @@ static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
dev_dbg(&chan->vc.chan.dev->device,
"%s(): checking txd %p[%x]: completed=%d\n",
__func__, vd, vd->tx.cookie, is_desc_completed(vd));
+ last_started = vd->tx.cookie;
if (to_pxad_sw_desc(vd)->cyclic) {
vchan_cyclic_callback(vd);
break;
@@ -690,7 +694,12 @@ static irqreturn_t pxad_chan_handler(int irq, void *dev_id)
}
}
- if (dcsr & PXA_DCSR_STOPSTATE) {
+ if (dcsr & PXA_DCSR_BUSERR) {
+ chan->bus_error = last_started;
+ phy_disable(phy);
+ }
+
+ if (!chan->bus_error && dcsr & PXA_DCSR_STOPSTATE) {
dev_dbg(&chan->vc.chan.dev->device,
"%s(): channel stopped, submitted_empty=%d issued_empty=%d",
__func__,
@@ -1249,6 +1258,9 @@ static enum dma_status pxad_tx_status(struct dma_chan *dchan,
struct pxad_chan *chan = to_pxad_chan(dchan);
enum dma_status ret;
+ if (cookie == chan->bus_error)
+ return DMA_ERROR;
+
ret = dma_cookie_status(dchan, cookie, txstate);
if (likely(txstate && (ret != DMA_ERROR)))
dma_set_residue(txstate, pxad_residue(chan, cookie));
@@ -1321,7 +1333,7 @@ static int pxad_init_phys(struct platform_device *op,
return 0;
}
-static const struct of_device_id const pxad_dt_ids[] = {
+static const struct of_device_id pxad_dt_ids[] = {
{ .compatible = "marvell,pdma-1.0", },
{}
};
diff --git a/drivers/dma/qcom/Makefile b/drivers/dma/qcom/Makefile
index bfea6990229f..4bfc38b45220 100644
--- a/drivers/dma/qcom/Makefile
+++ b/drivers/dma/qcom/Makefile
@@ -1,3 +1,5 @@
obj-$(CONFIG_QCOM_BAM_DMA) += bam_dma.o
obj-$(CONFIG_QCOM_HIDMA_MGMT) += hdma_mgmt.o
hdma_mgmt-objs := hidma_mgmt.o hidma_mgmt_sys.o
+obj-$(CONFIG_QCOM_HIDMA) += hdma.o
+hdma-objs := hidma_ll.o hidma.o hidma_dbg.o
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index d5e0a9c3ad5d..969b48176745 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -342,7 +342,7 @@ static const struct reg_offset_data bam_v1_7_reg_info[] = {
#define BAM_DESC_FIFO_SIZE SZ_32K
#define MAX_DESCRIPTORS (BAM_DESC_FIFO_SIZE / sizeof(struct bam_desc_hw) - 1)
-#define BAM_MAX_DATA_SIZE (SZ_32K - 8)
+#define BAM_FIFO_SIZE (SZ_32K - 8)
struct bam_chan {
struct virt_dma_chan vc;
@@ -387,6 +387,7 @@ struct bam_device {
/* execution environment ID, from DT */
u32 ee;
+ bool controlled_remotely;
const struct reg_offset_data *layout;
@@ -458,7 +459,7 @@ static void bam_chan_init_hw(struct bam_chan *bchan,
*/
writel_relaxed(ALIGN(bchan->fifo_phys, sizeof(struct bam_desc_hw)),
bam_addr(bdev, bchan->id, BAM_P_DESC_FIFO_ADDR));
- writel_relaxed(BAM_DESC_FIFO_SIZE,
+ writel_relaxed(BAM_FIFO_SIZE,
bam_addr(bdev, bchan->id, BAM_P_FIFO_SIZES));
/* enable the per pipe interrupts, enable EOT, ERR, and INT irqs */
@@ -604,7 +605,7 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
/* calculate number of required entries */
for_each_sg(sgl, sg, sg_len, i)
- num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_MAX_DATA_SIZE);
+ num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_FIFO_SIZE);
/* allocate enough room to accomodate the number of entries */
async_desc = kzalloc(sizeof(*async_desc) +
@@ -635,10 +636,10 @@ static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan,
desc->addr = cpu_to_le32(sg_dma_address(sg) +
curr_offset);
- if (remainder > BAM_MAX_DATA_SIZE) {
- desc->size = cpu_to_le16(BAM_MAX_DATA_SIZE);
- remainder -= BAM_MAX_DATA_SIZE;
- curr_offset += BAM_MAX_DATA_SIZE;
+ if (remainder > BAM_FIFO_SIZE) {
+ desc->size = cpu_to_le16(BAM_FIFO_SIZE);
+ remainder -= BAM_FIFO_SIZE;
+ curr_offset += BAM_FIFO_SIZE;
} else {
desc->size = cpu_to_le16(remainder);
remainder = 0;
@@ -801,13 +802,17 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
if (srcs & P_IRQ)
tasklet_schedule(&bdev->task);
- if (srcs & BAM_IRQ)
+ if (srcs & BAM_IRQ) {
clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS));
- /* don't allow reorder of the various accesses to the BAM registers */
- mb();
+ /*
+ * don't allow reorder of the various accesses to the BAM
+ * registers
+ */
+ mb();
- writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
+ writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
+ }
return IRQ_HANDLED;
}
@@ -1038,6 +1043,9 @@ static int bam_init(struct bam_device *bdev)
val = readl_relaxed(bam_addr(bdev, 0, BAM_NUM_PIPES));
bdev->num_channels = val & BAM_NUM_PIPES_MASK;
+ if (bdev->controlled_remotely)
+ return 0;
+
/* s/w reset bam */
/* after reset all pipes are disabled and idle */
val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL));
@@ -1125,6 +1133,9 @@ static int bam_dma_probe(struct platform_device *pdev)
return ret;
}
+ bdev->controlled_remotely = of_property_read_bool(pdev->dev.of_node,
+ "qcom,controlled-remotely");
+
bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
if (IS_ERR(bdev->bamclk))
return PTR_ERR(bdev->bamclk);
@@ -1163,7 +1174,7 @@ static int bam_dma_probe(struct platform_device *pdev)
/* set max dma segment size */
bdev->common.dev = bdev->dev;
bdev->common.dev->dma_parms = &bdev->dma_parms;
- ret = dma_set_max_seg_size(bdev->common.dev, BAM_MAX_DATA_SIZE);
+ ret = dma_set_max_seg_size(bdev->common.dev, BAM_FIFO_SIZE);
if (ret) {
dev_err(bdev->dev, "cannot set maximum segment size\n");
goto err_bam_channel_exit;
@@ -1234,6 +1245,9 @@ static int bam_dma_remove(struct platform_device *pdev)
bam_dma_terminate_all(&bdev->channels[i].vc.chan);
tasklet_kill(&bdev->channels[i].vc.task);
+ if (!bdev->channels[i].fifo_virt)
+ continue;
+
dma_free_wc(bdev->dev, BAM_DESC_FIFO_SIZE,
bdev->channels[i].fifo_virt,
bdev->channels[i].fifo_phys);
diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c
index cccc78efbca9..41b5c6dee713 100644
--- a/drivers/dma/qcom/hidma.c
+++ b/drivers/dma/qcom/hidma.c
@@ -1,7 +1,7 @@
/*
* Qualcomm Technologies HIDMA DMA engine interface
*
- * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -404,7 +404,7 @@ static int hidma_terminate_channel(struct dma_chan *chan)
spin_unlock_irqrestore(&mchan->lock, irqflags);
/* this suspends the existing transfer */
- rc = hidma_ll_pause(dmadev->lldev);
+ rc = hidma_ll_disable(dmadev->lldev);
if (rc) {
dev_err(dmadev->ddev.dev, "channel did not pause\n");
goto out;
@@ -427,7 +427,7 @@ static int hidma_terminate_channel(struct dma_chan *chan)
list_move(&mdesc->node, &mchan->free);
}
- rc = hidma_ll_resume(dmadev->lldev);
+ rc = hidma_ll_enable(dmadev->lldev);
out:
pm_runtime_mark_last_busy(dmadev->ddev.dev);
pm_runtime_put_autosuspend(dmadev->ddev.dev);
@@ -488,7 +488,7 @@ static int hidma_pause(struct dma_chan *chan)
dmadev = to_hidma_dev(mchan->chan.device);
if (!mchan->paused) {
pm_runtime_get_sync(dmadev->ddev.dev);
- if (hidma_ll_pause(dmadev->lldev))
+ if (hidma_ll_disable(dmadev->lldev))
dev_warn(dmadev->ddev.dev, "channel did not stop\n");
mchan->paused = true;
pm_runtime_mark_last_busy(dmadev->ddev.dev);
@@ -507,7 +507,7 @@ static int hidma_resume(struct dma_chan *chan)
dmadev = to_hidma_dev(mchan->chan.device);
if (mchan->paused) {
pm_runtime_get_sync(dmadev->ddev.dev);
- rc = hidma_ll_resume(dmadev->lldev);
+ rc = hidma_ll_enable(dmadev->lldev);
if (!rc)
mchan->paused = false;
else
@@ -530,6 +530,43 @@ static irqreturn_t hidma_chirq_handler(int chirq, void *arg)
return hidma_ll_inthandler(chirq, lldev);
}
+static ssize_t hidma_show_values(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct hidma_dev *mdev = platform_get_drvdata(pdev);
+
+ buf[0] = 0;
+
+ if (strcmp(attr->attr.name, "chid") == 0)
+ sprintf(buf, "%d\n", mdev->chidx);
+
+ return strlen(buf);
+}
+
+static int hidma_create_sysfs_entry(struct hidma_dev *dev, char *name,
+ int mode)
+{
+ struct device_attribute *attrs;
+ char *name_copy;
+
+ attrs = devm_kmalloc(dev->ddev.dev, sizeof(struct device_attribute),
+ GFP_KERNEL);
+ if (!attrs)
+ return -ENOMEM;
+
+ name_copy = devm_kstrdup(dev->ddev.dev, name, GFP_KERNEL);
+ if (!name_copy)
+ return -ENOMEM;
+
+ attrs->attr.name = name_copy;
+ attrs->attr.mode = mode;
+ attrs->show = hidma_show_values;
+ sysfs_attr_init(&attrs->attr);
+
+ return device_create_file(dev->ddev.dev, attrs);
+}
+
static int hidma_probe(struct platform_device *pdev)
{
struct hidma_dev *dmadev;
@@ -644,6 +681,8 @@ static int hidma_probe(struct platform_device *pdev)
dmadev->irq = chirq;
tasklet_init(&dmadev->task, hidma_issue_task, (unsigned long)dmadev);
+ hidma_debug_init(dmadev);
+ hidma_create_sysfs_entry(dmadev, "chid", S_IRUGO);
dev_info(&pdev->dev, "HI-DMA engine driver registration complete\n");
platform_set_drvdata(pdev, dmadev);
pm_runtime_mark_last_busy(dmadev->ddev.dev);
@@ -651,6 +690,7 @@ static int hidma_probe(struct platform_device *pdev)
return 0;
uninit:
+ hidma_debug_uninit(dmadev);
hidma_ll_uninit(dmadev->lldev);
dmafree:
if (dmadev)
@@ -668,6 +708,7 @@ static int hidma_remove(struct platform_device *pdev)
pm_runtime_get_sync(dmadev->ddev.dev);
dma_async_device_unregister(&dmadev->ddev);
devm_free_irq(dmadev->ddev.dev, dmadev->irq, dmadev->lldev);
+ hidma_debug_uninit(dmadev);
hidma_ll_uninit(dmadev->lldev);
hidma_free(dmadev);
@@ -689,7 +730,6 @@ static const struct of_device_id hidma_match[] = {
{.compatible = "qcom,hidma-1.0",},
{},
};
-
MODULE_DEVICE_TABLE(of, hidma_match);
static struct platform_driver hidma_driver = {
diff --git a/drivers/dma/qcom/hidma.h b/drivers/dma/qcom/hidma.h
index 231e306f6d87..db413a5efc4e 100644
--- a/drivers/dma/qcom/hidma.h
+++ b/drivers/dma/qcom/hidma.h
@@ -1,7 +1,7 @@
/*
* Qualcomm Technologies HIDMA data structures
*
- * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -20,32 +20,29 @@
#include <linux/interrupt.h>
#include <linux/dmaengine.h>
-#define TRE_SIZE 32 /* each TRE is 32 bytes */
-#define TRE_CFG_IDX 0
-#define TRE_LEN_IDX 1
-#define TRE_SRC_LOW_IDX 2
-#define TRE_SRC_HI_IDX 3
-#define TRE_DEST_LOW_IDX 4
-#define TRE_DEST_HI_IDX 5
-
-struct hidma_tx_status {
- u8 err_info; /* error record in this transfer */
- u8 err_code; /* completion code */
-};
+#define HIDMA_TRE_SIZE 32 /* each TRE is 32 bytes */
+#define HIDMA_TRE_CFG_IDX 0
+#define HIDMA_TRE_LEN_IDX 1
+#define HIDMA_TRE_SRC_LOW_IDX 2
+#define HIDMA_TRE_SRC_HI_IDX 3
+#define HIDMA_TRE_DEST_LOW_IDX 4
+#define HIDMA_TRE_DEST_HI_IDX 5
struct hidma_tre {
atomic_t allocated; /* if this channel is allocated */
bool queued; /* flag whether this is pending */
u16 status; /* status */
- u32 chidx; /* index of the tre */
+ u32 idx; /* index of the tre */
u32 dma_sig; /* signature of the tre */
const char *dev_name; /* name of the device */
void (*callback)(void *data); /* requester callback */
void *data; /* Data associated with this channel*/
struct hidma_lldev *lldev; /* lldma device pointer */
- u32 tre_local[TRE_SIZE / sizeof(u32) + 1]; /* TRE local copy */
+ u32 tre_local[HIDMA_TRE_SIZE / sizeof(u32) + 1]; /* TRE local copy */
u32 tre_index; /* the offset where this was written*/
u32 int_flags; /* interrupt flags */
+ u8 err_info; /* error record in this transfer */
+ u8 err_code; /* completion code */
};
struct hidma_lldev {
@@ -61,22 +58,21 @@ struct hidma_lldev {
void __iomem *evca; /* Event Channel address */
struct hidma_tre
**pending_tre_list; /* Pointers to pending TREs */
- struct hidma_tx_status
- *tx_status_list; /* Pointers to pending TREs status*/
s32 pending_tre_count; /* Number of TREs pending */
void *tre_ring; /* TRE ring */
- dma_addr_t tre_ring_handle; /* TRE ring to be shared with HW */
+ dma_addr_t tre_dma; /* TRE ring to be shared with HW */
u32 tre_ring_size; /* Byte size of the ring */
u32 tre_processed_off; /* last processed TRE */
void *evre_ring; /* EVRE ring */
- dma_addr_t evre_ring_handle; /* EVRE ring to be shared with HW */
+ dma_addr_t evre_dma; /* EVRE ring to be shared with HW */
u32 evre_ring_size; /* Byte size of the ring */
u32 evre_processed_off; /* last processed EVRE */
u32 tre_write_offset; /* TRE write location */
struct tasklet_struct task; /* task delivering notifications */
+ struct tasklet_struct rst_task; /* task to reset HW */
DECLARE_KFIFO_PTR(handoff_fifo,
struct hidma_tre *); /* pending TREs FIFO */
};
@@ -145,8 +141,8 @@ enum dma_status hidma_ll_status(struct hidma_lldev *llhndl, u32 tre_ch);
bool hidma_ll_isenabled(struct hidma_lldev *llhndl);
void hidma_ll_queue_request(struct hidma_lldev *llhndl, u32 tre_ch);
void hidma_ll_start(struct hidma_lldev *llhndl);
-int hidma_ll_pause(struct hidma_lldev *llhndl);
-int hidma_ll_resume(struct hidma_lldev *llhndl);
+int hidma_ll_disable(struct hidma_lldev *lldev);
+int hidma_ll_enable(struct hidma_lldev *llhndl);
void hidma_ll_set_transfer_params(struct hidma_lldev *llhndl, u32 tre_ch,
dma_addr_t src, dma_addr_t dest, u32 len, u32 flags);
int hidma_ll_setup(struct hidma_lldev *lldev);
@@ -157,4 +153,6 @@ int hidma_ll_uninit(struct hidma_lldev *llhndl);
irqreturn_t hidma_ll_inthandler(int irq, void *arg);
void hidma_cleanup_pending_tre(struct hidma_lldev *llhndl, u8 err_info,
u8 err_code);
+int hidma_debug_init(struct hidma_dev *dmadev);
+void hidma_debug_uninit(struct hidma_dev *dmadev);
#endif
diff --git a/drivers/dma/qcom/hidma_dbg.c b/drivers/dma/qcom/hidma_dbg.c
new file mode 100644
index 000000000000..fa827e5ffd68
--- /dev/null
+++ b/drivers/dma/qcom/hidma_dbg.c
@@ -0,0 +1,217 @@
+/*
+ * Qualcomm Technologies HIDMA debug file
+ *
+ * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/pm_runtime.h>
+
+#include "hidma.h"
+
+static void hidma_ll_chstats(struct seq_file *s, void *llhndl, u32 tre_ch)
+{
+ struct hidma_lldev *lldev = llhndl;
+ struct hidma_tre *tre;
+ u32 length;
+ dma_addr_t src_start;
+ dma_addr_t dest_start;
+ u32 *tre_local;
+
+ if (tre_ch >= lldev->nr_tres) {
+ dev_err(lldev->dev, "invalid TRE number in chstats:%d", tre_ch);
+ return;
+ }
+ tre = &lldev->trepool[tre_ch];
+ seq_printf(s, "------Channel %d -----\n", tre_ch);
+ seq_printf(s, "allocated=%d\n", atomic_read(&tre->allocated));
+ seq_printf(s, "queued = 0x%x\n", tre->queued);
+ seq_printf(s, "err_info = 0x%x\n", tre->err_info);
+ seq_printf(s, "err_code = 0x%x\n", tre->err_code);
+ seq_printf(s, "status = 0x%x\n", tre->status);
+ seq_printf(s, "idx = 0x%x\n", tre->idx);
+ seq_printf(s, "dma_sig = 0x%x\n", tre->dma_sig);
+ seq_printf(s, "dev_name=%s\n", tre->dev_name);
+ seq_printf(s, "callback=%p\n", tre->callback);
+ seq_printf(s, "data=%p\n", tre->data);
+ seq_printf(s, "tre_index = 0x%x\n", tre->tre_index);
+
+ tre_local = &tre->tre_local[0];
+ src_start = tre_local[HIDMA_TRE_SRC_LOW_IDX];
+ src_start = ((u64) (tre_local[HIDMA_TRE_SRC_HI_IDX]) << 32) + src_start;
+ dest_start = tre_local[HIDMA_TRE_DEST_LOW_IDX];
+ dest_start += ((u64) (tre_local[HIDMA_TRE_DEST_HI_IDX]) << 32);
+ length = tre_local[HIDMA_TRE_LEN_IDX];
+
+ seq_printf(s, "src=%pap\n", &src_start);
+ seq_printf(s, "dest=%pap\n", &dest_start);
+ seq_printf(s, "length = 0x%x\n", length);
+}
+
+static void hidma_ll_devstats(struct seq_file *s, void *llhndl)
+{
+ struct hidma_lldev *lldev = llhndl;
+
+ seq_puts(s, "------Device -----\n");
+ seq_printf(s, "lldev init = 0x%x\n", lldev->initialized);
+ seq_printf(s, "trch_state = 0x%x\n", lldev->trch_state);
+ seq_printf(s, "evch_state = 0x%x\n", lldev->evch_state);
+ seq_printf(s, "chidx = 0x%x\n", lldev->chidx);
+ seq_printf(s, "nr_tres = 0x%x\n", lldev->nr_tres);
+ seq_printf(s, "trca=%p\n", lldev->trca);
+ seq_printf(s, "tre_ring=%p\n", lldev->tre_ring);
+ seq_printf(s, "tre_ring_handle=%pap\n", &lldev->tre_dma);
+ seq_printf(s, "tre_ring_size = 0x%x\n", lldev->tre_ring_size);
+ seq_printf(s, "tre_processed_off = 0x%x\n", lldev->tre_processed_off);
+ seq_printf(s, "pending_tre_count=%d\n", lldev->pending_tre_count);
+ seq_printf(s, "evca=%p\n", lldev->evca);
+ seq_printf(s, "evre_ring=%p\n", lldev->evre_ring);
+ seq_printf(s, "evre_ring_handle=%pap\n", &lldev->evre_dma);
+ seq_printf(s, "evre_ring_size = 0x%x\n", lldev->evre_ring_size);
+ seq_printf(s, "evre_processed_off = 0x%x\n", lldev->evre_processed_off);
+ seq_printf(s, "tre_write_offset = 0x%x\n", lldev->tre_write_offset);
+}
+
+/*
+ * hidma_chan_stats: display HIDMA channel statistics
+ *
+ * Display the statistics for the current HIDMA virtual channel device.
+ */
+static int hidma_chan_stats(struct seq_file *s, void *unused)
+{
+ struct hidma_chan *mchan = s->private;
+ struct hidma_desc *mdesc;
+ struct hidma_dev *dmadev = mchan->dmadev;
+
+ pm_runtime_get_sync(dmadev->ddev.dev);
+ seq_printf(s, "paused=%u\n", mchan->paused);
+ seq_printf(s, "dma_sig=%u\n", mchan->dma_sig);
+ seq_puts(s, "prepared\n");
+ list_for_each_entry(mdesc, &mchan->prepared, node)
+ hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
+
+ seq_puts(s, "active\n");
+ list_for_each_entry(mdesc, &mchan->active, node)
+ hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
+
+ seq_puts(s, "completed\n");
+ list_for_each_entry(mdesc, &mchan->completed, node)
+ hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
+
+ hidma_ll_devstats(s, mchan->dmadev->lldev);
+ pm_runtime_mark_last_busy(dmadev->ddev.dev);
+ pm_runtime_put_autosuspend(dmadev->ddev.dev);
+ return 0;
+}
+
+/*
+ * hidma_dma_info: display HIDMA device info
+ *
+ * Display the info for the current HIDMA device.
+ */
+static int hidma_dma_info(struct seq_file *s, void *unused)
+{
+ struct hidma_dev *dmadev = s->private;
+ resource_size_t sz;
+
+ seq_printf(s, "nr_descriptors=%d\n", dmadev->nr_descriptors);
+ seq_printf(s, "dev_trca=%p\n", &dmadev->dev_trca);
+ seq_printf(s, "dev_trca_phys=%pa\n", &dmadev->trca_resource->start);
+ sz = resource_size(dmadev->trca_resource);
+ seq_printf(s, "dev_trca_size=%pa\n", &sz);
+ seq_printf(s, "dev_evca=%p\n", &dmadev->dev_evca);
+ seq_printf(s, "dev_evca_phys=%pa\n", &dmadev->evca_resource->start);
+ sz = resource_size(dmadev->evca_resource);
+ seq_printf(s, "dev_evca_size=%pa\n", &sz);
+ return 0;
+}
+
+static int hidma_chan_stats_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hidma_chan_stats, inode->i_private);
+}
+
+static int hidma_dma_info_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hidma_dma_info, inode->i_private);
+}
+
+static const struct file_operations hidma_chan_fops = {
+ .open = hidma_chan_stats_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations hidma_dma_fops = {
+ .open = hidma_dma_info_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+void hidma_debug_uninit(struct hidma_dev *dmadev)
+{
+ debugfs_remove_recursive(dmadev->debugfs);
+ debugfs_remove_recursive(dmadev->stats);
+}
+
+int hidma_debug_init(struct hidma_dev *dmadev)
+{
+ int rc = 0;
+ int chidx = 0;
+ struct list_head *position = NULL;
+
+ dmadev->debugfs = debugfs_create_dir(dev_name(dmadev->ddev.dev), NULL);
+ if (!dmadev->debugfs) {
+ rc = -ENODEV;
+ return rc;
+ }
+
+ /* walk through the virtual channel list */
+ list_for_each(position, &dmadev->ddev.channels) {
+ struct hidma_chan *chan;
+
+ chan = list_entry(position, struct hidma_chan,
+ chan.device_node);
+ sprintf(chan->dbg_name, "chan%d", chidx);
+ chan->debugfs = debugfs_create_dir(chan->dbg_name,
+ dmadev->debugfs);
+ if (!chan->debugfs) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+ chan->stats = debugfs_create_file("stats", S_IRUGO,
+ chan->debugfs, chan,
+ &hidma_chan_fops);
+ if (!chan->stats) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+ chidx++;
+ }
+
+ dmadev->stats = debugfs_create_file("stats", S_IRUGO,
+ dmadev->debugfs, dmadev,
+ &hidma_dma_fops);
+ if (!dmadev->stats) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+
+ return 0;
+cleanup:
+ hidma_debug_uninit(dmadev);
+ return rc;
+}
diff --git a/drivers/dma/qcom/hidma_ll.c b/drivers/dma/qcom/hidma_ll.c
new file mode 100644
index 000000000000..f3929001539b
--- /dev/null
+++ b/drivers/dma/qcom/hidma_ll.c
@@ -0,0 +1,872 @@
+/*
+ * Qualcomm Technologies HIDMA DMA engine low level code
+ *
+ * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/dmaengine.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/atomic.h>
+#include <linux/iopoll.h>
+#include <linux/kfifo.h>
+#include <linux/bitops.h>
+
+#include "hidma.h"
+
+#define HIDMA_EVRE_SIZE 16 /* each EVRE is 16 bytes */
+
+#define HIDMA_TRCA_CTRLSTS_REG 0x000
+#define HIDMA_TRCA_RING_LOW_REG 0x008
+#define HIDMA_TRCA_RING_HIGH_REG 0x00C
+#define HIDMA_TRCA_RING_LEN_REG 0x010
+#define HIDMA_TRCA_DOORBELL_REG 0x400
+
+#define HIDMA_EVCA_CTRLSTS_REG 0x000
+#define HIDMA_EVCA_INTCTRL_REG 0x004
+#define HIDMA_EVCA_RING_LOW_REG 0x008
+#define HIDMA_EVCA_RING_HIGH_REG 0x00C
+#define HIDMA_EVCA_RING_LEN_REG 0x010
+#define HIDMA_EVCA_WRITE_PTR_REG 0x020
+#define HIDMA_EVCA_DOORBELL_REG 0x400
+
+#define HIDMA_EVCA_IRQ_STAT_REG 0x100
+#define HIDMA_EVCA_IRQ_CLR_REG 0x108
+#define HIDMA_EVCA_IRQ_EN_REG 0x110
+
+#define HIDMA_EVRE_CFG_IDX 0
+
+#define HIDMA_EVRE_ERRINFO_BIT_POS 24
+#define HIDMA_EVRE_CODE_BIT_POS 28
+
+#define HIDMA_EVRE_ERRINFO_MASK GENMASK(3, 0)
+#define HIDMA_EVRE_CODE_MASK GENMASK(3, 0)
+
+#define HIDMA_CH_CONTROL_MASK GENMASK(7, 0)
+#define HIDMA_CH_STATE_MASK GENMASK(7, 0)
+#define HIDMA_CH_STATE_BIT_POS 0x8
+
+#define HIDMA_IRQ_EV_CH_EOB_IRQ_BIT_POS 0
+#define HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS 1
+#define HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS 9
+#define HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS 10
+#define HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS 11
+#define HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS 14
+
+#define ENABLE_IRQS (BIT(HIDMA_IRQ_EV_CH_EOB_IRQ_BIT_POS) | \
+ BIT(HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS) | \
+ BIT(HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS) | \
+ BIT(HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS) | \
+ BIT(HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS) | \
+ BIT(HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS))
+
+#define HIDMA_INCREMENT_ITERATOR(iter, size, ring_size) \
+do { \
+ iter += size; \
+ if (iter >= ring_size) \
+ iter -= ring_size; \
+} while (0)
+
+#define HIDMA_CH_STATE(val) \
+ ((val >> HIDMA_CH_STATE_BIT_POS) & HIDMA_CH_STATE_MASK)
+
+#define HIDMA_ERR_INT_MASK \
+ (BIT(HIDMA_IRQ_TR_CH_INVALID_TRE_BIT_POS) | \
+ BIT(HIDMA_IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS) | \
+ BIT(HIDMA_IRQ_EV_CH_WR_RESP_BIT_POS) | \
+ BIT(HIDMA_IRQ_TR_CH_DATA_RD_ER_BIT_POS) | \
+ BIT(HIDMA_IRQ_TR_CH_DATA_WR_ER_BIT_POS))
+
+enum ch_command {
+ HIDMA_CH_DISABLE = 0,
+ HIDMA_CH_ENABLE = 1,
+ HIDMA_CH_SUSPEND = 2,
+ HIDMA_CH_RESET = 9,
+};
+
+enum ch_state {
+ HIDMA_CH_DISABLED = 0,
+ HIDMA_CH_ENABLED = 1,
+ HIDMA_CH_RUNNING = 2,
+ HIDMA_CH_SUSPENDED = 3,
+ HIDMA_CH_STOPPED = 4,
+};
+
+enum tre_type {
+ HIDMA_TRE_MEMCPY = 3,
+};
+
+enum err_code {
+ HIDMA_EVRE_STATUS_COMPLETE = 1,
+ HIDMA_EVRE_STATUS_ERROR = 4,
+};
+
+static int hidma_is_chan_enabled(int state)
+{
+ switch (state) {
+ case HIDMA_CH_ENABLED:
+ case HIDMA_CH_RUNNING:
+ return true;
+ default:
+ return false;
+ }
+}
+
+void hidma_ll_free(struct hidma_lldev *lldev, u32 tre_ch)
+{
+ struct hidma_tre *tre;
+
+ if (tre_ch >= lldev->nr_tres) {
+ dev_err(lldev->dev, "invalid TRE number in free:%d", tre_ch);
+ return;
+ }
+
+ tre = &lldev->trepool[tre_ch];
+ if (atomic_read(&tre->allocated) != true) {
+ dev_err(lldev->dev, "trying to free an unused TRE:%d", tre_ch);
+ return;
+ }
+
+ atomic_set(&tre->allocated, 0);
+}
+
+int hidma_ll_request(struct hidma_lldev *lldev, u32 sig, const char *dev_name,
+ void (*callback)(void *data), void *data, u32 *tre_ch)
+{
+ unsigned int i;
+ struct hidma_tre *tre;
+ u32 *tre_local;
+
+ if (!tre_ch || !lldev)
+ return -EINVAL;
+
+ /* need to have at least one empty spot in the queue */
+ for (i = 0; i < lldev->nr_tres - 1; i++) {
+ if (atomic_add_unless(&lldev->trepool[i].allocated, 1, 1))
+ break;
+ }
+
+ if (i == (lldev->nr_tres - 1))
+ return -ENOMEM;
+
+ tre = &lldev->trepool[i];
+ tre->dma_sig = sig;
+ tre->dev_name = dev_name;
+ tre->callback = callback;
+ tre->data = data;
+ tre->idx = i;
+ tre->status = 0;
+ tre->queued = 0;
+ tre->err_code = 0;
+ tre->err_info = 0;
+ tre->lldev = lldev;
+ tre_local = &tre->tre_local[0];
+ tre_local[HIDMA_TRE_CFG_IDX] = HIDMA_TRE_MEMCPY;
+ tre_local[HIDMA_TRE_CFG_IDX] |= (lldev->chidx & 0xFF) << 8;
+ tre_local[HIDMA_TRE_CFG_IDX] |= BIT(16); /* set IEOB */
+ *tre_ch = i;
+ if (callback)
+ callback(data);
+ return 0;
+}
+
+/*
+ * Multiple TREs may be queued and waiting in the pending queue.
+ */
+static void hidma_ll_tre_complete(unsigned long arg)
+{
+ struct hidma_lldev *lldev = (struct hidma_lldev *)arg;
+ struct hidma_tre *tre;
+
+ while (kfifo_out(&lldev->handoff_fifo, &tre, 1)) {
+ /* call the user if it has been read by the hardware */
+ if (tre->callback)
+ tre->callback(tre->data);
+ }
+}
+
+static int hidma_post_completed(struct hidma_lldev *lldev, int tre_iterator,
+ u8 err_info, u8 err_code)
+{
+ struct hidma_tre *tre;
+ unsigned long flags;
+
+ spin_lock_irqsave(&lldev->lock, flags);
+ tre = lldev->pending_tre_list[tre_iterator / HIDMA_TRE_SIZE];
+ if (!tre) {
+ spin_unlock_irqrestore(&lldev->lock, flags);
+ dev_warn(lldev->dev, "tre_index [%d] and tre out of sync\n",
+ tre_iterator / HIDMA_TRE_SIZE);
+ return -EINVAL;
+ }
+ lldev->pending_tre_list[tre->tre_index] = NULL;
+
+ /*
+ * Keep track of pending TREs that SW is expecting to receive
+ * from HW. We got one now. Decrement our counter.
+ */
+ lldev->pending_tre_count--;
+ if (lldev->pending_tre_count < 0) {
+ dev_warn(lldev->dev, "tre count mismatch on completion");
+ lldev->pending_tre_count = 0;
+ }
+
+ spin_unlock_irqrestore(&lldev->lock, flags);
+
+ tre->err_info = err_info;
+ tre->err_code = err_code;
+ tre->queued = 0;
+
+ kfifo_put(&lldev->handoff_fifo, tre);
+ tasklet_schedule(&lldev->task);
+
+ return 0;
+}
+
+/*
+ * Called to handle the interrupt for the channel.
+ * Return a positive number if TRE or EVRE were consumed on this run.
+ * Return a positive number if there are pending TREs or EVREs.
+ * Return 0 if there is nothing to consume or no pending TREs/EVREs found.
+ */
+static int hidma_handle_tre_completion(struct hidma_lldev *lldev)
+{
+ u32 evre_ring_size = lldev->evre_ring_size;
+ u32 tre_ring_size = lldev->tre_ring_size;
+ u32 err_info, err_code, evre_write_off;
+ u32 tre_iterator, evre_iterator;
+ u32 num_completed = 0;
+
+ evre_write_off = readl_relaxed(lldev->evca + HIDMA_EVCA_WRITE_PTR_REG);
+ tre_iterator = lldev->tre_processed_off;
+ evre_iterator = lldev->evre_processed_off;
+
+ if ((evre_write_off > evre_ring_size) ||
+ (evre_write_off % HIDMA_EVRE_SIZE)) {
+ dev_err(lldev->dev, "HW reports invalid EVRE write offset\n");
+ return 0;
+ }
+
+ /*
+ * By the time control reaches here the number of EVREs and TREs
+ * may not match. Only consume the ones that hardware told us.
+ */
+ while ((evre_iterator != evre_write_off)) {
+ u32 *current_evre = lldev->evre_ring + evre_iterator;
+ u32 cfg;
+
+ cfg = current_evre[HIDMA_EVRE_CFG_IDX];
+ err_info = cfg >> HIDMA_EVRE_ERRINFO_BIT_POS;
+ err_info &= HIDMA_EVRE_ERRINFO_MASK;
+ err_code =
+ (cfg >> HIDMA_EVRE_CODE_BIT_POS) & HIDMA_EVRE_CODE_MASK;
+
+ if (hidma_post_completed(lldev, tre_iterator, err_info,
+ err_code))
+ break;
+
+ HIDMA_INCREMENT_ITERATOR(tre_iterator, HIDMA_TRE_SIZE,
+ tre_ring_size);
+ HIDMA_INCREMENT_ITERATOR(evre_iterator, HIDMA_EVRE_SIZE,
+ evre_ring_size);
+
+ /*
+ * Read the new event descriptor written by the HW.
+ * As we are processing the delivered events, other events
+ * get queued to the SW for processing.
+ */
+ evre_write_off =
+ readl_relaxed(lldev->evca + HIDMA_EVCA_WRITE_PTR_REG);
+ num_completed++;
+ }
+
+ if (num_completed) {
+ u32 evre_read_off = (lldev->evre_processed_off +
+ HIDMA_EVRE_SIZE * num_completed);
+ u32 tre_read_off = (lldev->tre_processed_off +
+ HIDMA_TRE_SIZE * num_completed);
+
+ evre_read_off = evre_read_off % evre_ring_size;
+ tre_read_off = tre_read_off % tre_ring_size;
+
+ writel(evre_read_off, lldev->evca + HIDMA_EVCA_DOORBELL_REG);
+
+ /* record the last processed tre offset */
+ lldev->tre_processed_off = tre_read_off;
+ lldev->evre_processed_off = evre_read_off;
+ }
+
+ return num_completed;
+}
+
+void hidma_cleanup_pending_tre(struct hidma_lldev *lldev, u8 err_info,
+ u8 err_code)
+{
+ u32 tre_iterator;
+ u32 tre_ring_size = lldev->tre_ring_size;
+ int num_completed = 0;
+ u32 tre_read_off;
+
+ tre_iterator = lldev->tre_processed_off;
+ while (lldev->pending_tre_count) {
+ if (hidma_post_completed(lldev, tre_iterator, err_info,
+ err_code))
+ break;
+ HIDMA_INCREMENT_ITERATOR(tre_iterator, HIDMA_TRE_SIZE,
+ tre_ring_size);
+ num_completed++;
+ }
+ tre_read_off = (lldev->tre_processed_off +
+ HIDMA_TRE_SIZE * num_completed);
+
+ tre_read_off = tre_read_off % tre_ring_size;
+
+ /* record the last processed tre offset */
+ lldev->tre_processed_off = tre_read_off;
+}
+
+static int hidma_ll_reset(struct hidma_lldev *lldev)
+{
+ u32 val;
+ int ret;
+
+ val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
+ val &= ~(HIDMA_CH_CONTROL_MASK << 16);
+ val |= HIDMA_CH_RESET << 16;
+ writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
+
+ /*
+ * Delay 10ms after reset to allow DMA logic to quiesce.
+ * Do a polled read up to 1ms and 10ms maximum.
+ */
+ ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
+ HIDMA_CH_STATE(val) == HIDMA_CH_DISABLED,
+ 1000, 10000);
+ if (ret) {
+ dev_err(lldev->dev, "transfer channel did not reset\n");
+ return ret;
+ }
+
+ val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
+ val &= ~(HIDMA_CH_CONTROL_MASK << 16);
+ val |= HIDMA_CH_RESET << 16;
+ writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
+
+ /*
+ * Delay 10ms after reset to allow DMA logic to quiesce.
+ * Do a polled read up to 1ms and 10ms maximum.
+ */
+ ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
+ HIDMA_CH_STATE(val) == HIDMA_CH_DISABLED,
+ 1000, 10000);
+ if (ret)
+ return ret;
+
+ lldev->trch_state = HIDMA_CH_DISABLED;
+ lldev->evch_state = HIDMA_CH_DISABLED;
+ return 0;
+}
+
+/*
+ * Abort all transactions and perform a reset.
+ */
+static void hidma_ll_abort(unsigned long arg)
+{
+ struct hidma_lldev *lldev = (struct hidma_lldev *)arg;
+ u8 err_code = HIDMA_EVRE_STATUS_ERROR;
+ u8 err_info = 0xFF;
+ int rc;
+
+ hidma_cleanup_pending_tre(lldev, err_info, err_code);
+
+ /* reset the channel for recovery */
+ rc = hidma_ll_setup(lldev);
+ if (rc) {
+ dev_err(lldev->dev, "channel reinitialize failed after error\n");
+ return;
+ }
+ writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
+}
+
+/*
+ * The interrupt handler for HIDMA will try to consume as many pending
+ * EVRE from the event queue as possible. Each EVRE has an associated
+ * TRE that holds the user interface parameters. EVRE reports the
+ * result of the transaction. Hardware guarantees ordering between EVREs
+ * and TREs. We use last processed offset to figure out which TRE is
+ * associated with which EVRE. If two TREs are consumed by HW, the EVREs
+ * are in order in the event ring.
+ *
+ * This handler will do a one pass for consuming EVREs. Other EVREs may
+ * be delivered while we are working. It will try to consume incoming
+ * EVREs one more time and return.
+ *
+ * For unprocessed EVREs, hardware will trigger another interrupt until
+ * all the interrupt bits are cleared.
+ *
+ * Hardware guarantees that by the time interrupt is observed, all data
+ * transactions in flight are delivered to their respective places and
+ * are visible to the CPU.
+ *
+ * On demand paging for IOMMU is only supported for PCIe via PRI
+ * (Page Request Interface) not for HIDMA. All other hardware instances
+ * including HIDMA work on pinned DMA addresses.
+ *
+ * HIDMA is not aware of IOMMU presence since it follows the DMA API. All
+ * IOMMU latency will be built into the data movement time. By the time
+ * interrupt happens, IOMMU lookups + data movement has already taken place.
+ *
+ * While the first read in a typical PCI endpoint ISR flushes all outstanding
+ * requests traditionally to the destination, this concept does not apply
+ * here for this HW.
+ */
+irqreturn_t hidma_ll_inthandler(int chirq, void *arg)
+{
+ struct hidma_lldev *lldev = arg;
+ u32 status;
+ u32 enable;
+ u32 cause;
+
+ /*
+ * Fine tuned for this HW...
+ *
+ * This ISR has been designed for this particular hardware. Relaxed
+ * read and write accessors are used for performance reasons due to
+ * interrupt delivery guarantees. Do not copy this code blindly and
+ * expect that to work.
+ */
+ status = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
+ enable = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
+ cause = status & enable;
+
+ while (cause) {
+ if (cause & HIDMA_ERR_INT_MASK) {
+ dev_err(lldev->dev, "error 0x%x, resetting...\n",
+ cause);
+
+ /* Clear out pending interrupts */
+ writel(cause, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
+
+ tasklet_schedule(&lldev->rst_task);
+ goto out;
+ }
+
+ /*
+ * Try to consume as many EVREs as possible.
+ */
+ hidma_handle_tre_completion(lldev);
+
+ /* We consumed TREs or there are pending TREs or EVREs. */
+ writel_relaxed(cause, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
+
+ /*
+ * Another interrupt might have arrived while we are
+ * processing this one. Read the new cause.
+ */
+ status = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
+ enable = readl_relaxed(lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
+ cause = status & enable;
+ }
+
+out:
+ return IRQ_HANDLED;
+}
+
+int hidma_ll_enable(struct hidma_lldev *lldev)
+{
+ u32 val;
+ int ret;
+
+ val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
+ val &= ~(HIDMA_CH_CONTROL_MASK << 16);
+ val |= HIDMA_CH_ENABLE << 16;
+ writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
+
+ ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
+ hidma_is_chan_enabled(HIDMA_CH_STATE(val)),
+ 1000, 10000);
+ if (ret) {
+ dev_err(lldev->dev, "event channel did not get enabled\n");
+ return ret;
+ }
+
+ val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
+ val &= ~(HIDMA_CH_CONTROL_MASK << 16);
+ val |= HIDMA_CH_ENABLE << 16;
+ writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
+
+ ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
+ hidma_is_chan_enabled(HIDMA_CH_STATE(val)),
+ 1000, 10000);
+ if (ret) {
+ dev_err(lldev->dev, "transfer channel did not get enabled\n");
+ return ret;
+ }
+
+ lldev->trch_state = HIDMA_CH_ENABLED;
+ lldev->evch_state = HIDMA_CH_ENABLED;
+
+ return 0;
+}
+
+void hidma_ll_start(struct hidma_lldev *lldev)
+{
+ unsigned long irqflags;
+
+ spin_lock_irqsave(&lldev->lock, irqflags);
+ writel(lldev->tre_write_offset, lldev->trca + HIDMA_TRCA_DOORBELL_REG);
+ spin_unlock_irqrestore(&lldev->lock, irqflags);
+}
+
+bool hidma_ll_isenabled(struct hidma_lldev *lldev)
+{
+ u32 val;
+
+ val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
+ lldev->trch_state = HIDMA_CH_STATE(val);
+ val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
+ lldev->evch_state = HIDMA_CH_STATE(val);
+
+ /* both channels have to be enabled before calling this function */
+ if (hidma_is_chan_enabled(lldev->trch_state) &&
+ hidma_is_chan_enabled(lldev->evch_state))
+ return true;
+
+ return false;
+}
+
+void hidma_ll_queue_request(struct hidma_lldev *lldev, u32 tre_ch)
+{
+ struct hidma_tre *tre;
+ unsigned long flags;
+
+ tre = &lldev->trepool[tre_ch];
+
+ /* copy the TRE into its location in the TRE ring */
+ spin_lock_irqsave(&lldev->lock, flags);
+ tre->tre_index = lldev->tre_write_offset / HIDMA_TRE_SIZE;
+ lldev->pending_tre_list[tre->tre_index] = tre;
+ memcpy(lldev->tre_ring + lldev->tre_write_offset,
+ &tre->tre_local[0], HIDMA_TRE_SIZE);
+ tre->err_code = 0;
+ tre->err_info = 0;
+ tre->queued = 1;
+ lldev->pending_tre_count++;
+ lldev->tre_write_offset = (lldev->tre_write_offset + HIDMA_TRE_SIZE)
+ % lldev->tre_ring_size;
+ spin_unlock_irqrestore(&lldev->lock, flags);
+}
+
+/*
+ * Note that even though we stop this channel if there is a pending transaction
+ * in flight it will complete and follow the callback. This request will
+ * prevent further requests to be made.
+ */
+int hidma_ll_disable(struct hidma_lldev *lldev)
+{
+ u32 val;
+ int ret;
+
+ val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
+ lldev->evch_state = HIDMA_CH_STATE(val);
+ val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
+ lldev->trch_state = HIDMA_CH_STATE(val);
+
+ /* already suspended by this OS */
+ if ((lldev->trch_state == HIDMA_CH_SUSPENDED) ||
+ (lldev->evch_state == HIDMA_CH_SUSPENDED))
+ return 0;
+
+ /* already stopped by the manager */
+ if ((lldev->trch_state == HIDMA_CH_STOPPED) ||
+ (lldev->evch_state == HIDMA_CH_STOPPED))
+ return 0;
+
+ val = readl(lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
+ val &= ~(HIDMA_CH_CONTROL_MASK << 16);
+ val |= HIDMA_CH_SUSPEND << 16;
+ writel(val, lldev->trca + HIDMA_TRCA_CTRLSTS_REG);
+
+ /*
+ * Start the wait right after the suspend is confirmed.
+ * Do a polled read up to 1ms and 10ms maximum.
+ */
+ ret = readl_poll_timeout(lldev->trca + HIDMA_TRCA_CTRLSTS_REG, val,
+ HIDMA_CH_STATE(val) == HIDMA_CH_SUSPENDED,
+ 1000, 10000);
+ if (ret)
+ return ret;
+
+ val = readl(lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
+ val &= ~(HIDMA_CH_CONTROL_MASK << 16);
+ val |= HIDMA_CH_SUSPEND << 16;
+ writel(val, lldev->evca + HIDMA_EVCA_CTRLSTS_REG);
+
+ /*
+ * Start the wait right after the suspend is confirmed
+ * Delay up to 10ms after reset to allow DMA logic to quiesce.
+ */
+ ret = readl_poll_timeout(lldev->evca + HIDMA_EVCA_CTRLSTS_REG, val,
+ HIDMA_CH_STATE(val) == HIDMA_CH_SUSPENDED,
+ 1000, 10000);
+ if (ret)
+ return ret;
+
+ lldev->trch_state = HIDMA_CH_SUSPENDED;
+ lldev->evch_state = HIDMA_CH_SUSPENDED;
+ return 0;
+}
+
+void hidma_ll_set_transfer_params(struct hidma_lldev *lldev, u32 tre_ch,
+ dma_addr_t src, dma_addr_t dest, u32 len,
+ u32 flags)
+{
+ struct hidma_tre *tre;
+ u32 *tre_local;
+
+ if (tre_ch >= lldev->nr_tres) {
+ dev_err(lldev->dev, "invalid TRE number in transfer params:%d",
+ tre_ch);
+ return;
+ }
+
+ tre = &lldev->trepool[tre_ch];
+ if (atomic_read(&tre->allocated) != true) {
+ dev_err(lldev->dev, "trying to set params on an unused TRE:%d",
+ tre_ch);
+ return;
+ }
+
+ tre_local = &tre->tre_local[0];
+ tre_local[HIDMA_TRE_LEN_IDX] = len;
+ tre_local[HIDMA_TRE_SRC_LOW_IDX] = lower_32_bits(src);
+ tre_local[HIDMA_TRE_SRC_HI_IDX] = upper_32_bits(src);
+ tre_local[HIDMA_TRE_DEST_LOW_IDX] = lower_32_bits(dest);
+ tre_local[HIDMA_TRE_DEST_HI_IDX] = upper_32_bits(dest);
+ tre->int_flags = flags;
+}
+
+/*
+ * Called during initialization and after an error condition
+ * to restore hardware state.
+ */
+int hidma_ll_setup(struct hidma_lldev *lldev)
+{
+ int rc;
+ u64 addr;
+ u32 val;
+ u32 nr_tres = lldev->nr_tres;
+
+ lldev->pending_tre_count = 0;
+ lldev->tre_processed_off = 0;
+ lldev->evre_processed_off = 0;
+ lldev->tre_write_offset = 0;
+
+ /* disable interrupts */
+ writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
+
+ /* clear all pending interrupts */
+ val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
+ writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
+
+ rc = hidma_ll_reset(lldev);
+ if (rc)
+ return rc;
+
+ /*
+ * Clear all pending interrupts again.
+ * Otherwise, we observe reset complete interrupts.
+ */
+ val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
+ writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
+
+ /* disable interrupts again after reset */
+ writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
+
+ addr = lldev->tre_dma;
+ writel(lower_32_bits(addr), lldev->trca + HIDMA_TRCA_RING_LOW_REG);
+ writel(upper_32_bits(addr), lldev->trca + HIDMA_TRCA_RING_HIGH_REG);
+ writel(lldev->tre_ring_size, lldev->trca + HIDMA_TRCA_RING_LEN_REG);
+
+ addr = lldev->evre_dma;
+ writel(lower_32_bits(addr), lldev->evca + HIDMA_EVCA_RING_LOW_REG);
+ writel(upper_32_bits(addr), lldev->evca + HIDMA_EVCA_RING_HIGH_REG);
+ writel(HIDMA_EVRE_SIZE * nr_tres,
+ lldev->evca + HIDMA_EVCA_RING_LEN_REG);
+
+ /* support IRQ only for now */
+ val = readl(lldev->evca + HIDMA_EVCA_INTCTRL_REG);
+ val &= ~0xF;
+ val |= 0x1;
+ writel(val, lldev->evca + HIDMA_EVCA_INTCTRL_REG);
+
+ /* clear all pending interrupts and enable them */
+ writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
+ writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
+
+ return hidma_ll_enable(lldev);
+}
+
+struct hidma_lldev *hidma_ll_init(struct device *dev, u32 nr_tres,
+ void __iomem *trca, void __iomem *evca,
+ u8 chidx)
+{
+ u32 required_bytes;
+ struct hidma_lldev *lldev;
+ int rc;
+ size_t sz;
+
+ if (!trca || !evca || !dev || !nr_tres)
+ return NULL;
+
+ /* need at least four TREs */
+ if (nr_tres < 4)
+ return NULL;
+
+ /* need an extra space */
+ nr_tres += 1;
+
+ lldev = devm_kzalloc(dev, sizeof(struct hidma_lldev), GFP_KERNEL);
+ if (!lldev)
+ return NULL;
+
+ lldev->evca = evca;
+ lldev->trca = trca;
+ lldev->dev = dev;
+ sz = sizeof(struct hidma_tre);
+ lldev->trepool = devm_kcalloc(lldev->dev, nr_tres, sz, GFP_KERNEL);
+ if (!lldev->trepool)
+ return NULL;
+
+ required_bytes = sizeof(lldev->pending_tre_list[0]);
+ lldev->pending_tre_list = devm_kcalloc(dev, nr_tres, required_bytes,
+ GFP_KERNEL);
+ if (!lldev->pending_tre_list)
+ return NULL;
+
+ sz = (HIDMA_TRE_SIZE + 1) * nr_tres;
+ lldev->tre_ring = dmam_alloc_coherent(dev, sz, &lldev->tre_dma,
+ GFP_KERNEL);
+ if (!lldev->tre_ring)
+ return NULL;
+
+ memset(lldev->tre_ring, 0, (HIDMA_TRE_SIZE + 1) * nr_tres);
+ lldev->tre_ring_size = HIDMA_TRE_SIZE * nr_tres;
+ lldev->nr_tres = nr_tres;
+
+ /* the TRE ring has to be TRE_SIZE aligned */
+ if (!IS_ALIGNED(lldev->tre_dma, HIDMA_TRE_SIZE)) {
+ u8 tre_ring_shift;
+
+ tre_ring_shift = lldev->tre_dma % HIDMA_TRE_SIZE;
+ tre_ring_shift = HIDMA_TRE_SIZE - tre_ring_shift;
+ lldev->tre_dma += tre_ring_shift;
+ lldev->tre_ring += tre_ring_shift;
+ }
+
+ sz = (HIDMA_EVRE_SIZE + 1) * nr_tres;
+ lldev->evre_ring = dmam_alloc_coherent(dev, sz, &lldev->evre_dma,
+ GFP_KERNEL);
+ if (!lldev->evre_ring)
+ return NULL;
+
+ memset(lldev->evre_ring, 0, (HIDMA_EVRE_SIZE + 1) * nr_tres);
+ lldev->evre_ring_size = HIDMA_EVRE_SIZE * nr_tres;
+
+ /* the EVRE ring has to be EVRE_SIZE aligned */
+ if (!IS_ALIGNED(lldev->evre_dma, HIDMA_EVRE_SIZE)) {
+ u8 evre_ring_shift;
+
+ evre_ring_shift = lldev->evre_dma % HIDMA_EVRE_SIZE;
+ evre_ring_shift = HIDMA_EVRE_SIZE - evre_ring_shift;
+ lldev->evre_dma += evre_ring_shift;
+ lldev->evre_ring += evre_ring_shift;
+ }
+ lldev->nr_tres = nr_tres;
+ lldev->chidx = chidx;
+
+ sz = nr_tres * sizeof(struct hidma_tre *);
+ rc = kfifo_alloc(&lldev->handoff_fifo, sz, GFP_KERNEL);
+ if (rc)
+ return NULL;
+
+ rc = hidma_ll_setup(lldev);
+ if (rc)
+ return NULL;
+
+ spin_lock_init(&lldev->lock);
+ tasklet_init(&lldev->rst_task, hidma_ll_abort, (unsigned long)lldev);
+ tasklet_init(&lldev->task, hidma_ll_tre_complete, (unsigned long)lldev);
+ lldev->initialized = 1;
+ writel(ENABLE_IRQS, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
+ return lldev;
+}
+
+int hidma_ll_uninit(struct hidma_lldev *lldev)
+{
+ u32 required_bytes;
+ int rc = 0;
+ u32 val;
+
+ if (!lldev)
+ return -ENODEV;
+
+ if (!lldev->initialized)
+ return 0;
+
+ lldev->initialized = 0;
+
+ required_bytes = sizeof(struct hidma_tre) * lldev->nr_tres;
+ tasklet_kill(&lldev->task);
+ memset(lldev->trepool, 0, required_bytes);
+ lldev->trepool = NULL;
+ lldev->pending_tre_count = 0;
+ lldev->tre_write_offset = 0;
+
+ rc = hidma_ll_reset(lldev);
+
+ /*
+ * Clear all pending interrupts again.
+ * Otherwise, we observe reset complete interrupts.
+ */
+ val = readl(lldev->evca + HIDMA_EVCA_IRQ_STAT_REG);
+ writel(val, lldev->evca + HIDMA_EVCA_IRQ_CLR_REG);
+ writel(0, lldev->evca + HIDMA_EVCA_IRQ_EN_REG);
+ return rc;
+}
+
+enum dma_status hidma_ll_status(struct hidma_lldev *lldev, u32 tre_ch)
+{
+ enum dma_status ret = DMA_ERROR;
+ struct hidma_tre *tre;
+ unsigned long flags;
+ u8 err_code;
+
+ spin_lock_irqsave(&lldev->lock, flags);
+
+ tre = &lldev->trepool[tre_ch];
+ err_code = tre->err_code;
+
+ if (err_code & HIDMA_EVRE_STATUS_COMPLETE)
+ ret = DMA_COMPLETE;
+ else if (err_code & HIDMA_EVRE_STATUS_ERROR)
+ ret = DMA_ERROR;
+ else
+ ret = DMA_IN_PROGRESS;
+ spin_unlock_irqrestore(&lldev->lock, flags);
+
+ return ret;
+}
diff --git a/drivers/dma/qcom/hidma_mgmt.c b/drivers/dma/qcom/hidma_mgmt.c
index ef491b893f40..c0e365321310 100644
--- a/drivers/dma/qcom/hidma_mgmt.c
+++ b/drivers/dma/qcom/hidma_mgmt.c
@@ -1,7 +1,7 @@
/*
* Qualcomm Technologies HIDMA DMA engine Management interface
*
- * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -17,13 +17,14 @@
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/property.h>
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/bitops.h>
+#include <linux/dma-mapping.h>
#include "hidma_mgmt.h"
@@ -298,5 +299,109 @@ static struct platform_driver hidma_mgmt_driver = {
},
};
-module_platform_driver(hidma_mgmt_driver);
+#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
+static int object_counter;
+
+static int __init hidma_mgmt_of_populate_channels(struct device_node *np)
+{
+ struct platform_device *pdev_parent = of_find_device_by_node(np);
+ struct platform_device_info pdevinfo;
+ struct of_phandle_args out_irq;
+ struct device_node *child;
+ struct resource *res;
+ const __be32 *cell;
+ int ret = 0, size, i, num;
+ u64 addr, addr_size;
+
+ for_each_available_child_of_node(np, child) {
+ struct resource *res_iter;
+ struct platform_device *new_pdev;
+
+ cell = of_get_property(child, "reg", &size);
+ if (!cell) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ size /= sizeof(*cell);
+ num = size /
+ (of_n_addr_cells(child) + of_n_size_cells(child)) + 1;
+
+ /* allocate a resource array */
+ res = kcalloc(num, sizeof(*res), GFP_KERNEL);
+ if (!res) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* read each reg value */
+ i = 0;
+ res_iter = res;
+ while (i < size) {
+ addr = of_read_number(&cell[i],
+ of_n_addr_cells(child));
+ i += of_n_addr_cells(child);
+
+ addr_size = of_read_number(&cell[i],
+ of_n_size_cells(child));
+ i += of_n_size_cells(child);
+
+ res_iter->start = addr;
+ res_iter->end = res_iter->start + addr_size - 1;
+ res_iter->flags = IORESOURCE_MEM;
+ res_iter++;
+ }
+
+ ret = of_irq_parse_one(child, 0, &out_irq);
+ if (ret)
+ goto out;
+
+ res_iter->start = irq_create_of_mapping(&out_irq);
+ res_iter->name = "hidma event irq";
+ res_iter->flags = IORESOURCE_IRQ;
+
+ memset(&pdevinfo, 0, sizeof(pdevinfo));
+ pdevinfo.fwnode = &child->fwnode;
+ pdevinfo.parent = pdev_parent ? &pdev_parent->dev : NULL;
+ pdevinfo.name = child->name;
+ pdevinfo.id = object_counter++;
+ pdevinfo.res = res;
+ pdevinfo.num_res = num;
+ pdevinfo.data = NULL;
+ pdevinfo.size_data = 0;
+ pdevinfo.dma_mask = DMA_BIT_MASK(64);
+ new_pdev = platform_device_register_full(&pdevinfo);
+ if (!new_pdev) {
+ ret = -ENODEV;
+ goto out;
+ }
+ of_dma_configure(&new_pdev->dev, child);
+
+ kfree(res);
+ res = NULL;
+ }
+out:
+ kfree(res);
+
+ return ret;
+}
+#endif
+
+static int __init hidma_mgmt_init(void)
+{
+#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
+ struct device_node *child;
+
+ for (child = of_find_matching_node(NULL, hidma_mgmt_match); child;
+ child = of_find_matching_node(child, hidma_mgmt_match)) {
+ /* device tree based firmware here */
+ hidma_mgmt_of_populate_channels(child);
+ of_node_put(child);
+ }
+#endif
+ platform_driver_register(&hidma_mgmt_driver);
+
+ return 0;
+}
+module_init(hidma_mgmt_init);
MODULE_LICENSE("GPL v2");
diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index 2db12e493c53..5065ca43face 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -146,6 +146,8 @@ struct sun6i_vchan {
struct dma_slave_config cfg;
struct sun6i_pchan *phy;
u8 port;
+ u8 irq_type;
+ bool cyclic;
};
struct sun6i_dma_dev {
@@ -254,6 +256,30 @@ static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width)
return addr_width >> 1;
}
+static size_t sun6i_get_chan_size(struct sun6i_pchan *pchan)
+{
+ struct sun6i_desc *txd = pchan->desc;
+ struct sun6i_dma_lli *lli;
+ size_t bytes;
+ dma_addr_t pos;
+
+ pos = readl(pchan->base + DMA_CHAN_LLI_ADDR);
+ bytes = readl(pchan->base + DMA_CHAN_CUR_CNT);
+
+ if (pos == LLI_LAST_ITEM)
+ return bytes;
+
+ for (lli = txd->v_lli; lli; lli = lli->v_lli_next) {
+ if (lli->p_lli_next == pos) {
+ for (lli = lli->v_lli_next; lli; lli = lli->v_lli_next)
+ bytes += lli->len;
+ break;
+ }
+ }
+
+ return bytes;
+}
+
static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
struct sun6i_dma_lli *next,
dma_addr_t next_phy,
@@ -276,45 +302,6 @@ static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev,
return next;
}
-static inline int sun6i_dma_cfg_lli(struct sun6i_dma_lli *lli,
- dma_addr_t src,
- dma_addr_t dst, u32 len,
- struct dma_slave_config *config)
-{
- u8 src_width, dst_width, src_burst, dst_burst;
-
- if (!config)
- return -EINVAL;
-
- src_burst = convert_burst(config->src_maxburst);
- if (src_burst)
- return src_burst;
-
- dst_burst = convert_burst(config->dst_maxburst);
- if (dst_burst)
- return dst_burst;
-
- src_width = convert_buswidth(config->src_addr_width);
- if (src_width)
- return src_width;
-
- dst_width = convert_buswidth(config->dst_addr_width);
- if (dst_width)
- return dst_width;
-
- lli->cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |
- DMA_CHAN_CFG_SRC_WIDTH(src_width) |
- DMA_CHAN_CFG_DST_BURST(dst_burst) |
- DMA_CHAN_CFG_DST_WIDTH(dst_width);
-
- lli->src = src;
- lli->dst = dst;
- lli->len = len;
- lli->para = NORMAL_WAIT;
-
- return 0;
-}
-
static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan,
struct sun6i_dma_lli *lli)
{
@@ -381,9 +368,13 @@ static int sun6i_dma_start_desc(struct sun6i_vchan *vchan)
irq_reg = pchan->idx / DMA_IRQ_CHAN_NR;
irq_offset = pchan->idx % DMA_IRQ_CHAN_NR;
- irq_val = readl(sdev->base + DMA_IRQ_EN(irq_offset));
- irq_val |= DMA_IRQ_QUEUE << (irq_offset * DMA_IRQ_CHAN_WIDTH);
- writel(irq_val, sdev->base + DMA_IRQ_EN(irq_offset));
+ vchan->irq_type = vchan->cyclic ? DMA_IRQ_PKG : DMA_IRQ_QUEUE;
+
+ irq_val = readl(sdev->base + DMA_IRQ_EN(irq_reg));
+ irq_val &= ~((DMA_IRQ_HALF | DMA_IRQ_PKG | DMA_IRQ_QUEUE) <<
+ (irq_offset * DMA_IRQ_CHAN_WIDTH));
+ irq_val |= vchan->irq_type << (irq_offset * DMA_IRQ_CHAN_WIDTH);
+ writel(irq_val, sdev->base + DMA_IRQ_EN(irq_reg));
writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR);
writel(DMA_CHAN_ENABLE_START, pchan->base + DMA_CHAN_ENABLE);
@@ -479,11 +470,12 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
writel(status, sdev->base + DMA_IRQ_STAT(i));
for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) {
- if (status & DMA_IRQ_QUEUE) {
- pchan = sdev->pchans + j;
- vchan = pchan->vchan;
-
- if (vchan) {
+ pchan = sdev->pchans + j;
+ vchan = pchan->vchan;
+ if (vchan && (status & vchan->irq_type)) {
+ if (vchan->cyclic) {
+ vchan_cyclic_callback(&pchan->desc->vd);
+ } else {
spin_lock(&vchan->vc.lock);
vchan_cookie_complete(&pchan->desc->vd);
pchan->done = pchan->desc;
@@ -502,6 +494,55 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id)
return ret;
}
+static int set_config(struct sun6i_dma_dev *sdev,
+ struct dma_slave_config *sconfig,
+ enum dma_transfer_direction direction,
+ u32 *p_cfg)
+{
+ s8 src_width, dst_width, src_burst, dst_burst;
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ src_burst = convert_burst(sconfig->src_maxburst ?
+ sconfig->src_maxburst : 8);
+ src_width = convert_buswidth(sconfig->src_addr_width !=
+ DMA_SLAVE_BUSWIDTH_UNDEFINED ?
+ sconfig->src_addr_width :
+ DMA_SLAVE_BUSWIDTH_4_BYTES);
+ dst_burst = convert_burst(sconfig->dst_maxburst);
+ dst_width = convert_buswidth(sconfig->dst_addr_width);
+ break;
+ case DMA_DEV_TO_MEM:
+ src_burst = convert_burst(sconfig->src_maxburst);
+ src_width = convert_buswidth(sconfig->src_addr_width);
+ dst_burst = convert_burst(sconfig->dst_maxburst ?
+ sconfig->dst_maxburst : 8);
+ dst_width = convert_buswidth(sconfig->dst_addr_width !=
+ DMA_SLAVE_BUSWIDTH_UNDEFINED ?
+ sconfig->dst_addr_width :
+ DMA_SLAVE_BUSWIDTH_4_BYTES);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (src_burst < 0)
+ return src_burst;
+ if (src_width < 0)
+ return src_width;
+ if (dst_burst < 0)
+ return dst_burst;
+ if (dst_width < 0)
+ return dst_width;
+
+ *p_cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |
+ DMA_CHAN_CFG_SRC_WIDTH(src_width) |
+ DMA_CHAN_CFG_DST_BURST(dst_burst) |
+ DMA_CHAN_CFG_DST_WIDTH(dst_width);
+
+ return 0;
+}
+
static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(
struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
size_t len, unsigned long flags)
@@ -569,13 +610,15 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
struct sun6i_desc *txd;
struct scatterlist *sg;
dma_addr_t p_lli;
+ u32 lli_cfg;
int i, ret;
if (!sgl)
return NULL;
- if (!is_slave_direction(dir)) {
- dev_err(chan2dev(chan), "Invalid DMA direction\n");
+ ret = set_config(sdev, sconfig, dir, &lli_cfg);
+ if (ret) {
+ dev_err(chan2dev(chan), "Invalid DMA configuration\n");
return NULL;
}
@@ -588,14 +631,14 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
if (!v_lli)
goto err_lli_free;
- if (dir == DMA_MEM_TO_DEV) {
- ret = sun6i_dma_cfg_lli(v_lli, sg_dma_address(sg),
- sconfig->dst_addr, sg_dma_len(sg),
- sconfig);
- if (ret)
- goto err_cur_lli_free;
+ v_lli->len = sg_dma_len(sg);
+ v_lli->para = NORMAL_WAIT;
- v_lli->cfg |= DMA_CHAN_CFG_DST_IO_MODE |
+ if (dir == DMA_MEM_TO_DEV) {
+ v_lli->src = sg_dma_address(sg);
+ v_lli->dst = sconfig->dst_addr;
+ v_lli->cfg = lli_cfg |
+ DMA_CHAN_CFG_DST_IO_MODE |
DMA_CHAN_CFG_SRC_LINEAR_MODE |
DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_DST_DRQ(vchan->port);
@@ -607,13 +650,10 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
sg_dma_len(sg), flags);
} else {
- ret = sun6i_dma_cfg_lli(v_lli, sconfig->src_addr,
- sg_dma_address(sg), sg_dma_len(sg),
- sconfig);
- if (ret)
- goto err_cur_lli_free;
-
- v_lli->cfg |= DMA_CHAN_CFG_DST_LINEAR_MODE |
+ v_lli->src = sconfig->src_addr;
+ v_lli->dst = sg_dma_address(sg);
+ v_lli->cfg = lli_cfg |
+ DMA_CHAN_CFG_DST_LINEAR_MODE |
DMA_CHAN_CFG_SRC_IO_MODE |
DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
DMA_CHAN_CFG_SRC_DRQ(vchan->port);
@@ -634,8 +674,78 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg(
return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
-err_cur_lli_free:
- dma_pool_free(sdev->pool, v_lli, p_lli);
+err_lli_free:
+ for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
+ dma_pool_free(sdev->pool, prev, virt_to_phys(prev));
+ kfree(txd);
+ return NULL;
+}
+
+static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_cyclic(
+ struct dma_chan *chan,
+ dma_addr_t buf_addr,
+ size_t buf_len,
+ size_t period_len,
+ enum dma_transfer_direction dir,
+ unsigned long flags)
+{
+ struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device);
+ struct sun6i_vchan *vchan = to_sun6i_vchan(chan);
+ struct dma_slave_config *sconfig = &vchan->cfg;
+ struct sun6i_dma_lli *v_lli, *prev = NULL;
+ struct sun6i_desc *txd;
+ dma_addr_t p_lli;
+ u32 lli_cfg;
+ unsigned int i, periods = buf_len / period_len;
+ int ret;
+
+ ret = set_config(sdev, sconfig, dir, &lli_cfg);
+ if (ret) {
+ dev_err(chan2dev(chan), "Invalid DMA configuration\n");
+ return NULL;
+ }
+
+ txd = kzalloc(sizeof(*txd), GFP_NOWAIT);
+ if (!txd)
+ return NULL;
+
+ for (i = 0; i < periods; i++) {
+ v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli);
+ if (!v_lli) {
+ dev_err(sdev->slave.dev, "Failed to alloc lli memory\n");
+ goto err_lli_free;
+ }
+
+ v_lli->len = period_len;
+ v_lli->para = NORMAL_WAIT;
+
+ if (dir == DMA_MEM_TO_DEV) {
+ v_lli->src = buf_addr + period_len * i;
+ v_lli->dst = sconfig->dst_addr;
+ v_lli->cfg = lli_cfg |
+ DMA_CHAN_CFG_DST_IO_MODE |
+ DMA_CHAN_CFG_SRC_LINEAR_MODE |
+ DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |
+ DMA_CHAN_CFG_DST_DRQ(vchan->port);
+ } else {
+ v_lli->src = sconfig->src_addr;
+ v_lli->dst = buf_addr + period_len * i;
+ v_lli->cfg = lli_cfg |
+ DMA_CHAN_CFG_DST_LINEAR_MODE |
+ DMA_CHAN_CFG_SRC_IO_MODE |
+ DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |
+ DMA_CHAN_CFG_SRC_DRQ(vchan->port);
+ }
+
+ prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd);
+ }
+
+ prev->p_lli_next = txd->p_lli; /* cyclic list */
+
+ vchan->cyclic = true;
+
+ return vchan_tx_prep(&vchan->vc, &txd->vd, flags);
+
err_lli_free:
for (prev = txd->v_lli; prev; prev = prev->v_lli_next)
dma_pool_free(sdev->pool, prev, virt_to_phys(prev));
@@ -712,6 +822,16 @@ static int sun6i_dma_terminate_all(struct dma_chan *chan)
spin_lock_irqsave(&vchan->vc.lock, flags);
+ if (vchan->cyclic) {
+ vchan->cyclic = false;
+ if (pchan && pchan->desc) {
+ struct virt_dma_desc *vd = &pchan->desc->vd;
+ struct virt_dma_chan *vc = &vchan->vc;
+
+ list_add_tail(&vd->node, &vc->desc_completed);
+ }
+ }
+
vchan_get_all_descriptors(&vchan->vc, &head);
if (pchan) {
@@ -759,7 +879,7 @@ static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan,
} else if (!pchan || !pchan->desc) {
bytes = 0;
} else {
- bytes = readl(pchan->base + DMA_CHAN_CUR_CNT);
+ bytes = sun6i_get_chan_size(pchan);
}
spin_unlock_irqrestore(&vchan->vc.lock, flags);
@@ -963,6 +1083,7 @@ static int sun6i_dma_probe(struct platform_device *pdev)
dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask);
dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask);
dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask);
+ dma_cap_set(DMA_CYCLIC, sdc->slave.cap_mask);
INIT_LIST_HEAD(&sdc->slave.channels);
sdc->slave.device_free_chan_resources = sun6i_dma_free_chan_resources;
@@ -970,6 +1091,7 @@ static int sun6i_dma_probe(struct platform_device *pdev)
sdc->slave.device_issue_pending = sun6i_dma_issue_pending;
sdc->slave.device_prep_slave_sg = sun6i_dma_prep_slave_sg;
sdc->slave.device_prep_dma_memcpy = sun6i_dma_prep_dma_memcpy;
+ sdc->slave.device_prep_dma_cyclic = sun6i_dma_prep_dma_cyclic;
sdc->slave.copy_align = DMAENGINE_ALIGN_4_BYTES;
sdc->slave.device_config = sun6i_dma_config;
sdc->slave.device_pause = sun6i_dma_pause;
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 3871f29e523d..01e316f73559 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -54,6 +54,7 @@
#define TEGRA_APBDMA_CSR_ONCE BIT(27)
#define TEGRA_APBDMA_CSR_FLOW BIT(21)
#define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16
+#define TEGRA_APBDMA_CSR_REQ_SEL_MASK 0x1F
#define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC
/* STATUS register */
@@ -114,6 +115,8 @@
/* Channel base address offset from APBDMA base address */
#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
+#define TEGRA_APBDMA_SLAVE_ID_INVALID (TEGRA_APBDMA_CSR_REQ_SEL_MASK + 1)
+
struct tegra_dma;
/*
@@ -353,8 +356,11 @@ static int tegra_dma_slave_config(struct dma_chan *dc,
}
memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig));
- if (!tdc->slave_id)
+ if (tdc->slave_id == TEGRA_APBDMA_SLAVE_ID_INVALID) {
+ if (sconfig->slave_id > TEGRA_APBDMA_CSR_REQ_SEL_MASK)
+ return -EINVAL;
tdc->slave_id = sconfig->slave_id;
+ }
tdc->config_init = true;
return 0;
}
@@ -1236,7 +1242,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
}
pm_runtime_put(tdma->dev);
- tdc->slave_id = 0;
+ tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
}
static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
@@ -1246,6 +1252,11 @@ static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
struct dma_chan *chan;
struct tegra_dma_channel *tdc;
+ if (dma_spec->args[0] > TEGRA_APBDMA_CSR_REQ_SEL_MASK) {
+ dev_err(tdma->dev, "Invalid slave id: %d\n", dma_spec->args[0]);
+ return NULL;
+ }
+
chan = dma_get_any_slave_channel(&tdma->dma_dev);
if (!chan)
return NULL;
@@ -1389,6 +1400,7 @@ static int tegra_dma_probe(struct platform_device *pdev)
&tdma->dma_dev.channels);
tdc->tdma = tdma;
tdc->id = i;
+ tdc->slave_id = TEGRA_APBDMA_SLAVE_ID_INVALID;
tasklet_init(&tdc->tasklet, tegra_dma_tasklet,
(unsigned long)tdc);
diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
new file mode 100644
index 000000000000..c4b121c4559d
--- /dev/null
+++ b/drivers/dma/tegra210-adma.c
@@ -0,0 +1,840 @@
+/*
+ * ADMA driver for Nvidia's Tegra210 ADMA controller.
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/pm_clock.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include "virt-dma.h"
+
+#define ADMA_CH_CMD 0x00
+#define ADMA_CH_STATUS 0x0c
+#define ADMA_CH_STATUS_XFER_EN BIT(0)
+
+#define ADMA_CH_INT_STATUS 0x10
+#define ADMA_CH_INT_STATUS_XFER_DONE BIT(0)
+
+#define ADMA_CH_INT_CLEAR 0x1c
+#define ADMA_CH_CTRL 0x24
+#define ADMA_CH_CTRL_TX_REQ(val) (((val) & 0xf) << 28)
+#define ADMA_CH_CTRL_TX_REQ_MAX 10
+#define ADMA_CH_CTRL_RX_REQ(val) (((val) & 0xf) << 24)
+#define ADMA_CH_CTRL_RX_REQ_MAX 10
+#define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12)
+#define ADMA_CH_CTRL_DIR_AHUB2MEM 2
+#define ADMA_CH_CTRL_DIR_MEM2AHUB 4
+#define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8)
+#define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1)
+
+#define ADMA_CH_CONFIG 0x28
+#define ADMA_CH_CONFIG_SRC_BUF(val) (((val) & 0x7) << 28)
+#define ADMA_CH_CONFIG_TRG_BUF(val) (((val) & 0x7) << 24)
+#define ADMA_CH_CONFIG_BURST_SIZE(val) (((val) & 0x7) << 20)
+#define ADMA_CH_CONFIG_BURST_16 5
+#define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf)
+#define ADMA_CH_CONFIG_MAX_BUFS 8
+
+#define ADMA_CH_FIFO_CTRL 0x2c
+#define ADMA_CH_FIFO_CTRL_OVRFW_THRES(val) (((val) & 0xf) << 24)
+#define ADMA_CH_FIFO_CTRL_STARV_THRES(val) (((val) & 0xf) << 16)
+#define ADMA_CH_FIFO_CTRL_TX_SIZE(val) (((val) & 0xf) << 8)
+#define ADMA_CH_FIFO_CTRL_RX_SIZE(val) ((val) & 0xf)
+
+#define ADMA_CH_LOWER_SRC_ADDR 0x34
+#define ADMA_CH_LOWER_TRG_ADDR 0x3c
+#define ADMA_CH_TC 0x44
+#define ADMA_CH_TC_COUNT_MASK 0x3ffffffc
+
+#define ADMA_CH_XFER_STATUS 0x54
+#define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff
+
+#define ADMA_GLOBAL_CMD 0xc00
+#define ADMA_GLOBAL_SOFT_RESET 0xc04
+#define ADMA_GLOBAL_INT_CLEAR 0xc20
+#define ADMA_GLOBAL_CTRL 0xc24
+
+#define ADMA_CH_REG_OFFSET(a) (a * 0x80)
+
+#define ADMA_CH_FIFO_CTRL_DEFAULT (ADMA_CH_FIFO_CTRL_OVRFW_THRES(1) | \
+ ADMA_CH_FIFO_CTRL_STARV_THRES(1) | \
+ ADMA_CH_FIFO_CTRL_TX_SIZE(3) | \
+ ADMA_CH_FIFO_CTRL_RX_SIZE(3))
+struct tegra_adma;
+
+/*
+ * struct tegra_adma_chip_data - Tegra chip specific data
+ * @nr_channels: Number of DMA channels available.
+ */
+struct tegra_adma_chip_data {
+ int nr_channels;
+};
+
+/*
+ * struct tegra_adma_chan_regs - Tegra ADMA channel registers
+ */
+struct tegra_adma_chan_regs {
+ unsigned int ctrl;
+ unsigned int config;
+ unsigned int src_addr;
+ unsigned int trg_addr;
+ unsigned int fifo_ctrl;
+ unsigned int tc;
+};
+
+/*
+ * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests.
+ */
+struct tegra_adma_desc {
+ struct virt_dma_desc vd;
+ struct tegra_adma_chan_regs ch_regs;
+ size_t buf_len;
+ size_t period_len;
+ size_t num_periods;
+};
+
+/*
+ * struct tegra_adma_chan - Tegra ADMA channel information
+ */
+struct tegra_adma_chan {
+ struct virt_dma_chan vc;
+ struct tegra_adma_desc *desc;
+ struct tegra_adma *tdma;
+ int irq;
+ void __iomem *chan_addr;
+
+ /* Slave channel configuration info */
+ struct dma_slave_config sconfig;
+ enum dma_transfer_direction sreq_dir;
+ unsigned int sreq_index;
+ bool sreq_reserved;
+
+ /* Transfer count and position info */
+ unsigned int tx_buf_count;
+ unsigned int tx_buf_pos;
+};
+
+/*
+ * struct tegra_adma - Tegra ADMA controller information
+ */
+struct tegra_adma {
+ struct dma_device dma_dev;
+ struct device *dev;
+ void __iomem *base_addr;
+ unsigned int nr_channels;
+ unsigned long rx_requests_reserved;
+ unsigned long tx_requests_reserved;
+
+ /* Used to store global command register state when suspending */
+ unsigned int global_cmd;
+
+ /* Last member of the structure */
+ struct tegra_adma_chan channels[0];
+};
+
+static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
+{
+ writel(val, tdma->base_addr + reg);
+}
+
+static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
+{
+ return readl(tdma->base_addr + reg);
+}
+
+static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
+{
+ writel(val, tdc->chan_addr + reg);
+}
+
+static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
+{
+ return readl(tdc->chan_addr + reg);
+}
+
+static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc)
+{
+ return container_of(dc, struct tegra_adma_chan, vc.chan);
+}
+
+static inline struct tegra_adma_desc *to_tegra_adma_desc(
+ struct dma_async_tx_descriptor *td)
+{
+ return container_of(td, struct tegra_adma_desc, vd.tx);
+}
+
+static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
+{
+ return tdc->tdma->dev;
+}
+
+static void tegra_adma_desc_free(struct virt_dma_desc *vd)
+{
+ kfree(container_of(vd, struct tegra_adma_desc, vd));
+}
+
+static int tegra_adma_slave_config(struct dma_chan *dc,
+ struct dma_slave_config *sconfig)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+
+ memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig));
+
+ return 0;
+}
+
+static int tegra_adma_init(struct tegra_adma *tdma)
+{
+ u32 status;
+ int ret;
+
+ /* Clear any interrupts */
+ tdma_write(tdma, ADMA_GLOBAL_INT_CLEAR, 0x1);
+
+ /* Assert soft reset */
+ tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
+
+ /* Wait for reset to clear */
+ ret = readx_poll_timeout(readl,
+ tdma->base_addr + ADMA_GLOBAL_SOFT_RESET,
+ status, status == 0, 20, 10000);
+ if (ret)
+ return ret;
+
+ /* Enable global ADMA registers */
+ tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
+
+ return 0;
+}
+
+static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
+ enum dma_transfer_direction direction)
+{
+ struct tegra_adma *tdma = tdc->tdma;
+ unsigned int sreq_index = tdc->sreq_index;
+
+ if (tdc->sreq_reserved)
+ return tdc->sreq_dir == direction ? 0 : -EINVAL;
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ if (sreq_index > ADMA_CH_CTRL_TX_REQ_MAX) {
+ dev_err(tdma->dev, "invalid DMA request\n");
+ return -EINVAL;
+ }
+
+ if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
+ dev_err(tdma->dev, "DMA request reserved\n");
+ return -EINVAL;
+ }
+ break;
+
+ case DMA_DEV_TO_MEM:
+ if (sreq_index > ADMA_CH_CTRL_RX_REQ_MAX) {
+ dev_err(tdma->dev, "invalid DMA request\n");
+ return -EINVAL;
+ }
+
+ if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
+ dev_err(tdma->dev, "DMA request reserved\n");
+ return -EINVAL;
+ }
+ break;
+
+ default:
+ dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
+ dma_chan_name(&tdc->vc.chan));
+ return -EINVAL;
+ }
+
+ tdc->sreq_dir = direction;
+ tdc->sreq_reserved = true;
+
+ return 0;
+}
+
+static void tegra_adma_request_free(struct tegra_adma_chan *tdc)
+{
+ struct tegra_adma *tdma = tdc->tdma;
+
+ if (!tdc->sreq_reserved)
+ return;
+
+ switch (tdc->sreq_dir) {
+ case DMA_MEM_TO_DEV:
+ clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved);
+ break;
+
+ case DMA_DEV_TO_MEM:
+ clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved);
+ break;
+
+ default:
+ dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
+ dma_chan_name(&tdc->vc.chan));
+ return;
+ }
+
+ tdc->sreq_reserved = false;
+}
+
+static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc)
+{
+ u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS);
+
+ return status & ADMA_CH_INT_STATUS_XFER_DONE;
+}
+
+static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc)
+{
+ u32 status = tegra_adma_irq_status(tdc);
+
+ if (status)
+ tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status);
+
+ return status;
+}
+
+static void tegra_adma_stop(struct tegra_adma_chan *tdc)
+{
+ unsigned int status;
+
+ /* Disable ADMA */
+ tdma_ch_write(tdc, ADMA_CH_CMD, 0);
+
+ /* Clear interrupt status */
+ tegra_adma_irq_clear(tdc);
+
+ if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS,
+ status, !(status & ADMA_CH_STATUS_XFER_EN),
+ 20, 10000)) {
+ dev_err(tdc2dev(tdc), "unable to stop DMA channel\n");
+ return;
+ }
+
+ kfree(tdc->desc);
+ tdc->desc = NULL;
+}
+
+static void tegra_adma_start(struct tegra_adma_chan *tdc)
+{
+ struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc);
+ struct tegra_adma_chan_regs *ch_regs;
+ struct tegra_adma_desc *desc;
+
+ if (!vd)
+ return;
+
+ list_del(&vd->node);
+
+ desc = to_tegra_adma_desc(&vd->tx);
+
+ if (!desc) {
+ dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n");
+ return;
+ }
+
+ ch_regs = &desc->ch_regs;
+
+ tdc->tx_buf_pos = 0;
+ tdc->tx_buf_count = 0;
+ tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc);
+ tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
+ tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr);
+ tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr);
+ tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl);
+ tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
+
+ /* Start ADMA */
+ tdma_ch_write(tdc, ADMA_CH_CMD, 1);
+
+ tdc->desc = desc;
+}
+
+static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc)
+{
+ struct tegra_adma_desc *desc = tdc->desc;
+ unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1;
+ unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS);
+ unsigned int periods_remaining;
+
+ /*
+ * Handle wrap around of buffer count register
+ */
+ if (pos < tdc->tx_buf_pos)
+ tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos);
+ else
+ tdc->tx_buf_count += pos - tdc->tx_buf_pos;
+
+ periods_remaining = tdc->tx_buf_count % desc->num_periods;
+ tdc->tx_buf_pos = pos;
+
+ return desc->buf_len - (periods_remaining * desc->period_len);
+}
+
+static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
+{
+ struct tegra_adma_chan *tdc = dev_id;
+ unsigned long status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tdc->vc.lock, flags);
+
+ status = tegra_adma_irq_clear(tdc);
+ if (status == 0 || !tdc->desc) {
+ spin_unlock_irqrestore(&tdc->vc.lock, flags);
+ return IRQ_NONE;
+ }
+
+ vchan_cyclic_callback(&tdc->desc->vd);
+
+ spin_unlock_irqrestore(&tdc->vc.lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static void tegra_adma_issue_pending(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&tdc->vc.lock, flags);
+
+ if (vchan_issue_pending(&tdc->vc)) {
+ if (!tdc->desc)
+ tegra_adma_start(tdc);
+ }
+
+ spin_unlock_irqrestore(&tdc->vc.lock, flags);
+}
+
+static int tegra_adma_terminate_all(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ unsigned long flags;
+ LIST_HEAD(head);
+
+ spin_lock_irqsave(&tdc->vc.lock, flags);
+
+ if (tdc->desc)
+ tegra_adma_stop(tdc);
+
+ tegra_adma_request_free(tdc);
+ vchan_get_all_descriptors(&tdc->vc, &head);
+ spin_unlock_irqrestore(&tdc->vc.lock, flags);
+ vchan_dma_desc_free_list(&tdc->vc, &head);
+
+ return 0;
+}
+
+static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ struct tegra_adma_desc *desc;
+ struct virt_dma_desc *vd;
+ enum dma_status ret;
+ unsigned long flags;
+ unsigned int residual;
+
+ ret = dma_cookie_status(dc, cookie, txstate);
+ if (ret == DMA_COMPLETE || !txstate)
+ return ret;
+
+ spin_lock_irqsave(&tdc->vc.lock, flags);
+
+ vd = vchan_find_desc(&tdc->vc, cookie);
+ if (vd) {
+ desc = to_tegra_adma_desc(&vd->tx);
+ residual = desc->ch_regs.tc;
+ } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
+ residual = tegra_adma_get_residue(tdc);
+ } else {
+ residual = 0;
+ }
+
+ spin_unlock_irqrestore(&tdc->vc.lock, flags);
+
+ dma_set_residue(txstate, residual);
+
+ return ret;
+}
+
+static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
+ struct tegra_adma_desc *desc,
+ dma_addr_t buf_addr,
+ enum dma_transfer_direction direction)
+{
+ struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
+ unsigned int burst_size, adma_dir;
+
+ if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
+ return -EINVAL;
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
+ burst_size = fls(tdc->sconfig.dst_maxburst);
+ ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
+ ch_regs->ctrl = ADMA_CH_CTRL_TX_REQ(tdc->sreq_index);
+ ch_regs->src_addr = buf_addr;
+ break;
+
+ case DMA_DEV_TO_MEM:
+ adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
+ burst_size = fls(tdc->sconfig.src_maxburst);
+ ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
+ ch_regs->ctrl = ADMA_CH_CTRL_RX_REQ(tdc->sreq_index);
+ ch_regs->trg_addr = buf_addr;
+ break;
+
+ default:
+ dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
+ return -EINVAL;
+ }
+
+ if (!burst_size || burst_size > ADMA_CH_CONFIG_BURST_16)
+ burst_size = ADMA_CH_CONFIG_BURST_16;
+
+ ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) |
+ ADMA_CH_CTRL_MODE_CONTINUOUS |
+ ADMA_CH_CTRL_FLOWCTRL_EN;
+ ch_regs->config |= ADMA_CH_CONFIG_BURST_SIZE(burst_size);
+ ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1);
+ ch_regs->fifo_ctrl = ADMA_CH_FIFO_CTRL_DEFAULT;
+ ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
+
+ return tegra_adma_request_alloc(tdc, direction);
+}
+
+static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
+ struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
+ size_t period_len, enum dma_transfer_direction direction,
+ unsigned long flags)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ struct tegra_adma_desc *desc = NULL;
+
+ if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
+ dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
+ return NULL;
+ }
+
+ if (buf_len % period_len) {
+ dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
+ return NULL;
+ }
+
+ if (!IS_ALIGNED(buf_addr, 4)) {
+ dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
+ return NULL;
+ }
+
+ desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
+ if (!desc)
+ return NULL;
+
+ desc->buf_len = buf_len;
+ desc->period_len = period_len;
+ desc->num_periods = buf_len / period_len;
+
+ if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
+ kfree(desc);
+ return NULL;
+ }
+
+ return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
+}
+
+static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ int ret;
+
+ ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
+ if (ret) {
+ dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
+ dma_chan_name(dc));
+ return ret;
+ }
+
+ ret = pm_runtime_get_sync(tdc2dev(tdc));
+ if (ret < 0) {
+ free_irq(tdc->irq, tdc);
+ return ret;
+ }
+
+ dma_cookie_init(&tdc->vc.chan);
+
+ return 0;
+}
+
+static void tegra_adma_free_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+
+ tegra_adma_terminate_all(dc);
+ vchan_free_chan_resources(&tdc->vc);
+ tasklet_kill(&tdc->vc.task);
+ free_irq(tdc->irq, tdc);
+ pm_runtime_put(tdc2dev(tdc));
+
+ tdc->sreq_index = 0;
+ tdc->sreq_dir = DMA_TRANS_NONE;
+}
+
+static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct tegra_adma *tdma = ofdma->of_dma_data;
+ struct tegra_adma_chan *tdc;
+ struct dma_chan *chan;
+ unsigned int sreq_index;
+
+ if (dma_spec->args_count != 1)
+ return NULL;
+
+ sreq_index = dma_spec->args[0];
+
+ if (sreq_index == 0) {
+ dev_err(tdma->dev, "DMA request must not be 0\n");
+ return NULL;
+ }
+
+ chan = dma_get_any_slave_channel(&tdma->dma_dev);
+ if (!chan)
+ return NULL;
+
+ tdc = to_tegra_adma_chan(chan);
+ tdc->sreq_index = sreq_index;
+
+ return chan;
+}
+
+static int tegra_adma_runtime_suspend(struct device *dev)
+{
+ struct tegra_adma *tdma = dev_get_drvdata(dev);
+
+ tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
+
+ return pm_clk_suspend(dev);
+}
+
+static int tegra_adma_runtime_resume(struct device *dev)
+{
+ struct tegra_adma *tdma = dev_get_drvdata(dev);
+ int ret;
+
+ ret = pm_clk_resume(dev);
+ if (ret)
+ return ret;
+
+ tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
+
+ return 0;
+}
+
+static const struct tegra_adma_chip_data tegra210_chip_data = {
+ .nr_channels = 22,
+};
+
+static const struct of_device_id tegra_adma_of_match[] = {
+ { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
+
+static int tegra_adma_probe(struct platform_device *pdev)
+{
+ const struct tegra_adma_chip_data *cdata;
+ struct tegra_adma *tdma;
+ struct resource *res;
+ struct clk *clk;
+ int ret, i;
+
+ cdata = of_device_get_match_data(&pdev->dev);
+ if (!cdata) {
+ dev_err(&pdev->dev, "device match data not found\n");
+ return -ENODEV;
+ }
+
+ tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels *
+ sizeof(struct tegra_adma_chan), GFP_KERNEL);
+ if (!tdma)
+ return -ENOMEM;
+
+ tdma->dev = &pdev->dev;
+ tdma->nr_channels = cdata->nr_channels;
+ platform_set_drvdata(pdev, tdma);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(tdma->base_addr))
+ return PTR_ERR(tdma->base_addr);
+
+ ret = pm_clk_create(&pdev->dev);
+ if (ret)
+ return ret;
+
+ clk = clk_get(&pdev->dev, "d_audio");
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "ADMA clock not found\n");
+ ret = PTR_ERR(clk);
+ goto clk_destroy;
+ }
+
+ ret = pm_clk_add_clk(&pdev->dev, clk);
+ if (ret) {
+ clk_put(clk);
+ goto clk_destroy;
+ }
+
+ pm_runtime_enable(&pdev->dev);
+
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (ret < 0)
+ goto rpm_disable;
+
+ ret = tegra_adma_init(tdma);
+ if (ret)
+ goto rpm_put;
+
+ INIT_LIST_HEAD(&tdma->dma_dev.channels);
+ for (i = 0; i < tdma->nr_channels; i++) {
+ struct tegra_adma_chan *tdc = &tdma->channels[i];
+
+ tdc->chan_addr = tdma->base_addr + ADMA_CH_REG_OFFSET(i);
+
+ tdc->irq = of_irq_get(pdev->dev.of_node, i);
+ if (tdc->irq < 0) {
+ ret = tdc->irq;
+ goto irq_dispose;
+ }
+
+ vchan_init(&tdc->vc, &tdma->dma_dev);
+ tdc->vc.desc_free = tegra_adma_desc_free;
+ tdc->tdma = tdma;
+ }
+
+ dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
+
+ tdma->dma_dev.dev = &pdev->dev;
+ tdma->dma_dev.device_alloc_chan_resources =
+ tegra_adma_alloc_chan_resources;
+ tdma->dma_dev.device_free_chan_resources =
+ tegra_adma_free_chan_resources;
+ tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
+ tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
+ tdma->dma_dev.device_config = tegra_adma_slave_config;
+ tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
+ tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
+ tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
+
+ ret = dma_async_device_register(&tdma->dma_dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
+ goto irq_dispose;
+ }
+
+ ret = of_dma_controller_register(pdev->dev.of_node,
+ tegra_dma_of_xlate, tdma);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
+ goto dma_remove;
+ }
+
+ pm_runtime_put(&pdev->dev);
+
+ dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
+ tdma->nr_channels);
+
+ return 0;
+
+dma_remove:
+ dma_async_device_unregister(&tdma->dma_dev);
+irq_dispose:
+ while (--i >= 0)
+ irq_dispose_mapping(tdma->channels[i].irq);
+rpm_put:
+ pm_runtime_put_sync(&pdev->dev);
+rpm_disable:
+ pm_runtime_disable(&pdev->dev);
+clk_destroy:
+ pm_clk_destroy(&pdev->dev);
+
+ return ret;
+}
+
+static int tegra_adma_remove(struct platform_device *pdev)
+{
+ struct tegra_adma *tdma = platform_get_drvdata(pdev);
+ int i;
+
+ dma_async_device_unregister(&tdma->dma_dev);
+
+ for (i = 0; i < tdma->nr_channels; ++i)
+ irq_dispose_mapping(tdma->channels[i].irq);
+
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ pm_clk_destroy(&pdev->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tegra_adma_pm_suspend(struct device *dev)
+{
+ return pm_runtime_suspended(dev) == false;
+}
+#endif
+
+static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
+ tegra_adma_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, NULL)
+};
+
+static struct platform_driver tegra_admac_driver = {
+ .driver = {
+ .name = "tegra-adma",
+ .pm = &tegra_adma_dev_pm_ops,
+ .of_match_table = tegra_adma_of_match,
+ },
+ .probe = tegra_adma_probe,
+ .remove = tegra_adma_remove,
+};
+
+module_platform_driver(tegra_admac_driver);
+
+MODULE_ALIAS("platform:tegra210-adma");
+MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
+MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
+MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c
index ef67f278e076..df9118540b91 100644
--- a/drivers/dma/xilinx/xilinx_vdma.c
+++ b/drivers/dma/xilinx/xilinx_vdma.c
@@ -16,6 +16,15 @@
* video device (S2MM). Initialization, status, interrupt and management
* registers are accessed through an AXI4-Lite slave interface.
*
+ * The AXI Direct Memory Access (AXI DMA) core is a soft Xilinx IP core that
+ * provides high-bandwidth one dimensional direct memory access between memory
+ * and AXI4-Stream target peripherals. It supports one receive and one
+ * transmit channel, both of them optional at synthesis time.
+ *
+ * The AXI CDMA, is a soft IP, which provides high-bandwidth Direct Memory
+ * Access (DMA) between a memory-mapped source address and a memory-mapped
+ * destination address.
+ *
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
@@ -35,116 +44,138 @@
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
+#include <linux/clk.h>
#include "../dmaengine.h"
/* Register/Descriptor Offsets */
-#define XILINX_VDMA_MM2S_CTRL_OFFSET 0x0000
-#define XILINX_VDMA_S2MM_CTRL_OFFSET 0x0030
+#define XILINX_DMA_MM2S_CTRL_OFFSET 0x0000
+#define XILINX_DMA_S2MM_CTRL_OFFSET 0x0030
#define XILINX_VDMA_MM2S_DESC_OFFSET 0x0050
#define XILINX_VDMA_S2MM_DESC_OFFSET 0x00a0
/* Control Registers */
-#define XILINX_VDMA_REG_DMACR 0x0000
-#define XILINX_VDMA_DMACR_DELAY_MAX 0xff
-#define XILINX_VDMA_DMACR_DELAY_SHIFT 24
-#define XILINX_VDMA_DMACR_FRAME_COUNT_MAX 0xff
-#define XILINX_VDMA_DMACR_FRAME_COUNT_SHIFT 16
-#define XILINX_VDMA_DMACR_ERR_IRQ BIT(14)
-#define XILINX_VDMA_DMACR_DLY_CNT_IRQ BIT(13)
-#define XILINX_VDMA_DMACR_FRM_CNT_IRQ BIT(12)
-#define XILINX_VDMA_DMACR_MASTER_SHIFT 8
-#define XILINX_VDMA_DMACR_FSYNCSRC_SHIFT 5
-#define XILINX_VDMA_DMACR_FRAMECNT_EN BIT(4)
-#define XILINX_VDMA_DMACR_GENLOCK_EN BIT(3)
-#define XILINX_VDMA_DMACR_RESET BIT(2)
-#define XILINX_VDMA_DMACR_CIRC_EN BIT(1)
-#define XILINX_VDMA_DMACR_RUNSTOP BIT(0)
-#define XILINX_VDMA_DMACR_FSYNCSRC_MASK GENMASK(6, 5)
-
-#define XILINX_VDMA_REG_DMASR 0x0004
-#define XILINX_VDMA_DMASR_EOL_LATE_ERR BIT(15)
-#define XILINX_VDMA_DMASR_ERR_IRQ BIT(14)
-#define XILINX_VDMA_DMASR_DLY_CNT_IRQ BIT(13)
-#define XILINX_VDMA_DMASR_FRM_CNT_IRQ BIT(12)
-#define XILINX_VDMA_DMASR_SOF_LATE_ERR BIT(11)
-#define XILINX_VDMA_DMASR_SG_DEC_ERR BIT(10)
-#define XILINX_VDMA_DMASR_SG_SLV_ERR BIT(9)
-#define XILINX_VDMA_DMASR_EOF_EARLY_ERR BIT(8)
-#define XILINX_VDMA_DMASR_SOF_EARLY_ERR BIT(7)
-#define XILINX_VDMA_DMASR_DMA_DEC_ERR BIT(6)
-#define XILINX_VDMA_DMASR_DMA_SLAVE_ERR BIT(5)
-#define XILINX_VDMA_DMASR_DMA_INT_ERR BIT(4)
-#define XILINX_VDMA_DMASR_IDLE BIT(1)
-#define XILINX_VDMA_DMASR_HALTED BIT(0)
-#define XILINX_VDMA_DMASR_DELAY_MASK GENMASK(31, 24)
-#define XILINX_VDMA_DMASR_FRAME_COUNT_MASK GENMASK(23, 16)
-
-#define XILINX_VDMA_REG_CURDESC 0x0008
-#define XILINX_VDMA_REG_TAILDESC 0x0010
-#define XILINX_VDMA_REG_REG_INDEX 0x0014
-#define XILINX_VDMA_REG_FRMSTORE 0x0018
-#define XILINX_VDMA_REG_THRESHOLD 0x001c
-#define XILINX_VDMA_REG_FRMPTR_STS 0x0024
-#define XILINX_VDMA_REG_PARK_PTR 0x0028
-#define XILINX_VDMA_PARK_PTR_WR_REF_SHIFT 8
-#define XILINX_VDMA_PARK_PTR_RD_REF_SHIFT 0
-#define XILINX_VDMA_REG_VDMA_VERSION 0x002c
+#define XILINX_DMA_REG_DMACR 0x0000
+#define XILINX_DMA_DMACR_DELAY_MAX 0xff
+#define XILINX_DMA_DMACR_DELAY_SHIFT 24
+#define XILINX_DMA_DMACR_FRAME_COUNT_MAX 0xff
+#define XILINX_DMA_DMACR_FRAME_COUNT_SHIFT 16
+#define XILINX_DMA_DMACR_ERR_IRQ BIT(14)
+#define XILINX_DMA_DMACR_DLY_CNT_IRQ BIT(13)
+#define XILINX_DMA_DMACR_FRM_CNT_IRQ BIT(12)
+#define XILINX_DMA_DMACR_MASTER_SHIFT 8
+#define XILINX_DMA_DMACR_FSYNCSRC_SHIFT 5
+#define XILINX_DMA_DMACR_FRAMECNT_EN BIT(4)
+#define XILINX_DMA_DMACR_GENLOCK_EN BIT(3)
+#define XILINX_DMA_DMACR_RESET BIT(2)
+#define XILINX_DMA_DMACR_CIRC_EN BIT(1)
+#define XILINX_DMA_DMACR_RUNSTOP BIT(0)
+#define XILINX_DMA_DMACR_FSYNCSRC_MASK GENMASK(6, 5)
+
+#define XILINX_DMA_REG_DMASR 0x0004
+#define XILINX_DMA_DMASR_EOL_LATE_ERR BIT(15)
+#define XILINX_DMA_DMASR_ERR_IRQ BIT(14)
+#define XILINX_DMA_DMASR_DLY_CNT_IRQ BIT(13)
+#define XILINX_DMA_DMASR_FRM_CNT_IRQ BIT(12)
+#define XILINX_DMA_DMASR_SOF_LATE_ERR BIT(11)
+#define XILINX_DMA_DMASR_SG_DEC_ERR BIT(10)
+#define XILINX_DMA_DMASR_SG_SLV_ERR BIT(9)
+#define XILINX_DMA_DMASR_EOF_EARLY_ERR BIT(8)
+#define XILINX_DMA_DMASR_SOF_EARLY_ERR BIT(7)
+#define XILINX_DMA_DMASR_DMA_DEC_ERR BIT(6)
+#define XILINX_DMA_DMASR_DMA_SLAVE_ERR BIT(5)
+#define XILINX_DMA_DMASR_DMA_INT_ERR BIT(4)
+#define XILINX_DMA_DMASR_IDLE BIT(1)
+#define XILINX_DMA_DMASR_HALTED BIT(0)
+#define XILINX_DMA_DMASR_DELAY_MASK GENMASK(31, 24)
+#define XILINX_DMA_DMASR_FRAME_COUNT_MASK GENMASK(23, 16)
+
+#define XILINX_DMA_REG_CURDESC 0x0008
+#define XILINX_DMA_REG_TAILDESC 0x0010
+#define XILINX_DMA_REG_REG_INDEX 0x0014
+#define XILINX_DMA_REG_FRMSTORE 0x0018
+#define XILINX_DMA_REG_THRESHOLD 0x001c
+#define XILINX_DMA_REG_FRMPTR_STS 0x0024
+#define XILINX_DMA_REG_PARK_PTR 0x0028
+#define XILINX_DMA_PARK_PTR_WR_REF_SHIFT 8
+#define XILINX_DMA_PARK_PTR_RD_REF_SHIFT 0
+#define XILINX_DMA_REG_VDMA_VERSION 0x002c
/* Register Direct Mode Registers */
-#define XILINX_VDMA_REG_VSIZE 0x0000
-#define XILINX_VDMA_REG_HSIZE 0x0004
+#define XILINX_DMA_REG_VSIZE 0x0000
+#define XILINX_DMA_REG_HSIZE 0x0004
-#define XILINX_VDMA_REG_FRMDLY_STRIDE 0x0008
-#define XILINX_VDMA_FRMDLY_STRIDE_FRMDLY_SHIFT 24
-#define XILINX_VDMA_FRMDLY_STRIDE_STRIDE_SHIFT 0
+#define XILINX_DMA_REG_FRMDLY_STRIDE 0x0008
+#define XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT 24
+#define XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT 0
#define XILINX_VDMA_REG_START_ADDRESS(n) (0x000c + 4 * (n))
+#define XILINX_VDMA_REG_START_ADDRESS_64(n) (0x000c + 8 * (n))
/* HW specific definitions */
-#define XILINX_VDMA_MAX_CHANS_PER_DEVICE 0x2
-
-#define XILINX_VDMA_DMAXR_ALL_IRQ_MASK \
- (XILINX_VDMA_DMASR_FRM_CNT_IRQ | \
- XILINX_VDMA_DMASR_DLY_CNT_IRQ | \
- XILINX_VDMA_DMASR_ERR_IRQ)
-
-#define XILINX_VDMA_DMASR_ALL_ERR_MASK \
- (XILINX_VDMA_DMASR_EOL_LATE_ERR | \
- XILINX_VDMA_DMASR_SOF_LATE_ERR | \
- XILINX_VDMA_DMASR_SG_DEC_ERR | \
- XILINX_VDMA_DMASR_SG_SLV_ERR | \
- XILINX_VDMA_DMASR_EOF_EARLY_ERR | \
- XILINX_VDMA_DMASR_SOF_EARLY_ERR | \
- XILINX_VDMA_DMASR_DMA_DEC_ERR | \
- XILINX_VDMA_DMASR_DMA_SLAVE_ERR | \
- XILINX_VDMA_DMASR_DMA_INT_ERR)
+#define XILINX_DMA_MAX_CHANS_PER_DEVICE 0x2
+
+#define XILINX_DMA_DMAXR_ALL_IRQ_MASK \
+ (XILINX_DMA_DMASR_FRM_CNT_IRQ | \
+ XILINX_DMA_DMASR_DLY_CNT_IRQ | \
+ XILINX_DMA_DMASR_ERR_IRQ)
+
+#define XILINX_DMA_DMASR_ALL_ERR_MASK \
+ (XILINX_DMA_DMASR_EOL_LATE_ERR | \
+ XILINX_DMA_DMASR_SOF_LATE_ERR | \
+ XILINX_DMA_DMASR_SG_DEC_ERR | \
+ XILINX_DMA_DMASR_SG_SLV_ERR | \
+ XILINX_DMA_DMASR_EOF_EARLY_ERR | \
+ XILINX_DMA_DMASR_SOF_EARLY_ERR | \
+ XILINX_DMA_DMASR_DMA_DEC_ERR | \
+ XILINX_DMA_DMASR_DMA_SLAVE_ERR | \
+ XILINX_DMA_DMASR_DMA_INT_ERR)
/*
* Recoverable errors are DMA Internal error, SOF Early, EOF Early
* and SOF Late. They are only recoverable when C_FLUSH_ON_FSYNC
* is enabled in the h/w system.
*/
-#define XILINX_VDMA_DMASR_ERR_RECOVER_MASK \
- (XILINX_VDMA_DMASR_SOF_LATE_ERR | \
- XILINX_VDMA_DMASR_EOF_EARLY_ERR | \
- XILINX_VDMA_DMASR_SOF_EARLY_ERR | \
- XILINX_VDMA_DMASR_DMA_INT_ERR)
+#define XILINX_DMA_DMASR_ERR_RECOVER_MASK \
+ (XILINX_DMA_DMASR_SOF_LATE_ERR | \
+ XILINX_DMA_DMASR_EOF_EARLY_ERR | \
+ XILINX_DMA_DMASR_SOF_EARLY_ERR | \
+ XILINX_DMA_DMASR_DMA_INT_ERR)
/* Axi VDMA Flush on Fsync bits */
-#define XILINX_VDMA_FLUSH_S2MM 3
-#define XILINX_VDMA_FLUSH_MM2S 2
-#define XILINX_VDMA_FLUSH_BOTH 1
+#define XILINX_DMA_FLUSH_S2MM 3
+#define XILINX_DMA_FLUSH_MM2S 2
+#define XILINX_DMA_FLUSH_BOTH 1
/* Delay loop counter to prevent hardware failure */
-#define XILINX_VDMA_LOOP_COUNT 1000000
+#define XILINX_DMA_LOOP_COUNT 1000000
+
+/* AXI DMA Specific Registers/Offsets */
+#define XILINX_DMA_REG_SRCDSTADDR 0x18
+#define XILINX_DMA_REG_BTT 0x28
+
+/* AXI DMA Specific Masks/Bit fields */
+#define XILINX_DMA_MAX_TRANS_LEN GENMASK(22, 0)
+#define XILINX_DMA_CR_COALESCE_MAX GENMASK(23, 16)
+#define XILINX_DMA_CR_COALESCE_SHIFT 16
+#define XILINX_DMA_BD_SOP BIT(27)
+#define XILINX_DMA_BD_EOP BIT(26)
+#define XILINX_DMA_COALESCE_MAX 255
+#define XILINX_DMA_NUM_APP_WORDS 5
+
+/* AXI CDMA Specific Registers/Offsets */
+#define XILINX_CDMA_REG_SRCADDR 0x18
+#define XILINX_CDMA_REG_DSTADDR 0x20
+
+/* AXI CDMA Specific Masks */
+#define XILINX_CDMA_CR_SGMODE BIT(3)
/**
* struct xilinx_vdma_desc_hw - Hardware Descriptor
* @next_desc: Next Descriptor Pointer @0x00
* @pad1: Reserved @0x04
* @buf_addr: Buffer address @0x08
- * @pad2: Reserved @0x0C
+ * @buf_addr_msb: MSB of Buffer address @0x0C
* @vsize: Vertical Size @0x10
* @hsize: Horizontal Size @0x14
* @stride: Number of bytes between the first
@@ -154,13 +185,59 @@ struct xilinx_vdma_desc_hw {
u32 next_desc;
u32 pad1;
u32 buf_addr;
- u32 pad2;
+ u32 buf_addr_msb;
u32 vsize;
u32 hsize;
u32 stride;
} __aligned(64);
/**
+ * struct xilinx_axidma_desc_hw - Hardware Descriptor for AXI DMA
+ * @next_desc: Next Descriptor Pointer @0x00
+ * @pad1: Reserved @0x04
+ * @buf_addr: Buffer address @0x08
+ * @pad2: Reserved @0x0C
+ * @pad3: Reserved @0x10
+ * @pad4: Reserved @0x14
+ * @control: Control field @0x18
+ * @status: Status field @0x1C
+ * @app: APP Fields @0x20 - 0x30
+ */
+struct xilinx_axidma_desc_hw {
+ u32 next_desc;
+ u32 pad1;
+ u32 buf_addr;
+ u32 pad2;
+ u32 pad3;
+ u32 pad4;
+ u32 control;
+ u32 status;
+ u32 app[XILINX_DMA_NUM_APP_WORDS];
+} __aligned(64);
+
+/**
+ * struct xilinx_cdma_desc_hw - Hardware Descriptor
+ * @next_desc: Next Descriptor Pointer @0x00
+ * @pad1: Reserved @0x04
+ * @src_addr: Source address @0x08
+ * @pad2: Reserved @0x0C
+ * @dest_addr: Destination address @0x10
+ * @pad3: Reserved @0x14
+ * @control: Control field @0x18
+ * @status: Status field @0x1C
+ */
+struct xilinx_cdma_desc_hw {
+ u32 next_desc;
+ u32 pad1;
+ u32 src_addr;
+ u32 pad2;
+ u32 dest_addr;
+ u32 pad3;
+ u32 control;
+ u32 status;
+} __aligned(64);
+
+/**
* struct xilinx_vdma_tx_segment - Descriptor segment
* @hw: Hardware descriptor
* @node: Node in the descriptor segments list
@@ -173,19 +250,43 @@ struct xilinx_vdma_tx_segment {
} __aligned(64);
/**
- * struct xilinx_vdma_tx_descriptor - Per Transaction structure
+ * struct xilinx_axidma_tx_segment - Descriptor segment
+ * @hw: Hardware descriptor
+ * @node: Node in the descriptor segments list
+ * @phys: Physical address of segment
+ */
+struct xilinx_axidma_tx_segment {
+ struct xilinx_axidma_desc_hw hw;
+ struct list_head node;
+ dma_addr_t phys;
+} __aligned(64);
+
+/**
+ * struct xilinx_cdma_tx_segment - Descriptor segment
+ * @hw: Hardware descriptor
+ * @node: Node in the descriptor segments list
+ * @phys: Physical address of segment
+ */
+struct xilinx_cdma_tx_segment {
+ struct xilinx_cdma_desc_hw hw;
+ struct list_head node;
+ dma_addr_t phys;
+} __aligned(64);
+
+/**
+ * struct xilinx_dma_tx_descriptor - Per Transaction structure
* @async_tx: Async transaction descriptor
* @segments: TX segments list
* @node: Node in the channel descriptors list
*/
-struct xilinx_vdma_tx_descriptor {
+struct xilinx_dma_tx_descriptor {
struct dma_async_tx_descriptor async_tx;
struct list_head segments;
struct list_head node;
};
/**
- * struct xilinx_vdma_chan - Driver specific VDMA channel structure
+ * struct xilinx_dma_chan - Driver specific DMA channel structure
* @xdev: Driver specific device structure
* @ctrl_offset: Control registers offset
* @desc_offset: TX descriptor registers offset
@@ -207,9 +308,14 @@ struct xilinx_vdma_tx_descriptor {
* @config: Device configuration info
* @flush_on_fsync: Flush on Frame sync
* @desc_pendingcount: Descriptor pending count
+ * @ext_addr: Indicates 64 bit addressing is supported by dma channel
+ * @desc_submitcount: Descriptor h/w submitted count
+ * @residue: Residue for AXI DMA
+ * @seg_v: Statically allocated segments base
+ * @start_transfer: Differentiate b/w DMA IP's transfer
*/
-struct xilinx_vdma_chan {
- struct xilinx_vdma_device *xdev;
+struct xilinx_dma_chan {
+ struct xilinx_dma_device *xdev;
u32 ctrl_offset;
u32 desc_offset;
spinlock_t lock;
@@ -230,73 +336,122 @@ struct xilinx_vdma_chan {
struct xilinx_vdma_config config;
bool flush_on_fsync;
u32 desc_pendingcount;
+ bool ext_addr;
+ u32 desc_submitcount;
+ u32 residue;
+ struct xilinx_axidma_tx_segment *seg_v;
+ void (*start_transfer)(struct xilinx_dma_chan *chan);
+};
+
+struct xilinx_dma_config {
+ enum xdma_ip_type dmatype;
+ int (*clk_init)(struct platform_device *pdev, struct clk **axi_clk,
+ struct clk **tx_clk, struct clk **txs_clk,
+ struct clk **rx_clk, struct clk **rxs_clk);
};
/**
- * struct xilinx_vdma_device - VDMA device structure
+ * struct xilinx_dma_device - DMA device structure
* @regs: I/O mapped base address
* @dev: Device Structure
* @common: DMA device structure
- * @chan: Driver specific VDMA channel
+ * @chan: Driver specific DMA channel
* @has_sg: Specifies whether Scatter-Gather is present or not
* @flush_on_fsync: Flush on frame sync
+ * @ext_addr: Indicates 64 bit addressing is supported by dma device
+ * @pdev: Platform device structure pointer
+ * @dma_config: DMA config structure
+ * @axi_clk: DMA Axi4-lite interace clock
+ * @tx_clk: DMA mm2s clock
+ * @txs_clk: DMA mm2s stream clock
+ * @rx_clk: DMA s2mm clock
+ * @rxs_clk: DMA s2mm stream clock
*/
-struct xilinx_vdma_device {
+struct xilinx_dma_device {
void __iomem *regs;
struct device *dev;
struct dma_device common;
- struct xilinx_vdma_chan *chan[XILINX_VDMA_MAX_CHANS_PER_DEVICE];
+ struct xilinx_dma_chan *chan[XILINX_DMA_MAX_CHANS_PER_DEVICE];
bool has_sg;
u32 flush_on_fsync;
+ bool ext_addr;
+ struct platform_device *pdev;
+ const struct xilinx_dma_config *dma_config;
+ struct clk *axi_clk;
+ struct clk *tx_clk;
+ struct clk *txs_clk;
+ struct clk *rx_clk;
+ struct clk *rxs_clk;
};
/* Macros */
#define to_xilinx_chan(chan) \
- container_of(chan, struct xilinx_vdma_chan, common)
-#define to_vdma_tx_descriptor(tx) \
- container_of(tx, struct xilinx_vdma_tx_descriptor, async_tx)
-#define xilinx_vdma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \
+ container_of(chan, struct xilinx_dma_chan, common)
+#define to_dma_tx_descriptor(tx) \
+ container_of(tx, struct xilinx_dma_tx_descriptor, async_tx)
+#define xilinx_dma_poll_timeout(chan, reg, val, cond, delay_us, timeout_us) \
readl_poll_timeout(chan->xdev->regs + chan->ctrl_offset + reg, val, \
cond, delay_us, timeout_us)
/* IO accessors */
-static inline u32 vdma_read(struct xilinx_vdma_chan *chan, u32 reg)
+static inline u32 dma_read(struct xilinx_dma_chan *chan, u32 reg)
{
return ioread32(chan->xdev->regs + reg);
}
-static inline void vdma_write(struct xilinx_vdma_chan *chan, u32 reg, u32 value)
+static inline void dma_write(struct xilinx_dma_chan *chan, u32 reg, u32 value)
{
iowrite32(value, chan->xdev->regs + reg);
}
-static inline void vdma_desc_write(struct xilinx_vdma_chan *chan, u32 reg,
+static inline void vdma_desc_write(struct xilinx_dma_chan *chan, u32 reg,
u32 value)
{
- vdma_write(chan, chan->desc_offset + reg, value);
+ dma_write(chan, chan->desc_offset + reg, value);
}
-static inline u32 vdma_ctrl_read(struct xilinx_vdma_chan *chan, u32 reg)
+static inline u32 dma_ctrl_read(struct xilinx_dma_chan *chan, u32 reg)
{
- return vdma_read(chan, chan->ctrl_offset + reg);
+ return dma_read(chan, chan->ctrl_offset + reg);
}
-static inline void vdma_ctrl_write(struct xilinx_vdma_chan *chan, u32 reg,
+static inline void dma_ctrl_write(struct xilinx_dma_chan *chan, u32 reg,
u32 value)
{
- vdma_write(chan, chan->ctrl_offset + reg, value);
+ dma_write(chan, chan->ctrl_offset + reg, value);
}
-static inline void vdma_ctrl_clr(struct xilinx_vdma_chan *chan, u32 reg,
+static inline void dma_ctrl_clr(struct xilinx_dma_chan *chan, u32 reg,
u32 clr)
{
- vdma_ctrl_write(chan, reg, vdma_ctrl_read(chan, reg) & ~clr);
+ dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) & ~clr);
}
-static inline void vdma_ctrl_set(struct xilinx_vdma_chan *chan, u32 reg,
+static inline void dma_ctrl_set(struct xilinx_dma_chan *chan, u32 reg,
u32 set)
{
- vdma_ctrl_write(chan, reg, vdma_ctrl_read(chan, reg) | set);
+ dma_ctrl_write(chan, reg, dma_ctrl_read(chan, reg) | set);
+}
+
+/**
+ * vdma_desc_write_64 - 64-bit descriptor write
+ * @chan: Driver specific VDMA channel
+ * @reg: Register to write
+ * @value_lsb: lower address of the descriptor.
+ * @value_msb: upper address of the descriptor.
+ *
+ * Since vdma driver is trying to write to a register offset which is not a
+ * multiple of 64 bits(ex : 0x5c), we are writing as two separate 32 bits
+ * instead of a single 64 bit register write.
+ */
+static inline void vdma_desc_write_64(struct xilinx_dma_chan *chan, u32 reg,
+ u32 value_lsb, u32 value_msb)
+{
+ /* Write the lsb 32 bits*/
+ writel(value_lsb, chan->xdev->regs + chan->desc_offset + reg);
+
+ /* Write the msb 32 bits */
+ writel(value_msb, chan->xdev->regs + chan->desc_offset + reg + 4);
}
/* -----------------------------------------------------------------------------
@@ -305,16 +460,59 @@ static inline void vdma_ctrl_set(struct xilinx_vdma_chan *chan, u32 reg,
/**
* xilinx_vdma_alloc_tx_segment - Allocate transaction segment
- * @chan: Driver specific VDMA channel
+ * @chan: Driver specific DMA channel
*
* Return: The allocated segment on success and NULL on failure.
*/
static struct xilinx_vdma_tx_segment *
-xilinx_vdma_alloc_tx_segment(struct xilinx_vdma_chan *chan)
+xilinx_vdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
{
struct xilinx_vdma_tx_segment *segment;
dma_addr_t phys;
+ segment = dma_pool_zalloc(chan->desc_pool, GFP_ATOMIC, &phys);
+ if (!segment)
+ return NULL;
+
+ segment->phys = phys;
+
+ return segment;
+}
+
+/**
+ * xilinx_cdma_alloc_tx_segment - Allocate transaction segment
+ * @chan: Driver specific DMA channel
+ *
+ * Return: The allocated segment on success and NULL on failure.
+ */
+static struct xilinx_cdma_tx_segment *
+xilinx_cdma_alloc_tx_segment(struct xilinx_dma_chan *chan)
+{
+ struct xilinx_cdma_tx_segment *segment;
+ dma_addr_t phys;
+
+ segment = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &phys);
+ if (!segment)
+ return NULL;
+
+ memset(segment, 0, sizeof(*segment));
+ segment->phys = phys;
+
+ return segment;
+}
+
+/**
+ * xilinx_axidma_alloc_tx_segment - Allocate transaction segment
+ * @chan: Driver specific DMA channel
+ *
+ * Return: The allocated segment on success and NULL on failure.
+ */
+static struct xilinx_axidma_tx_segment *
+xilinx_axidma_alloc_tx_segment(struct xilinx_dma_chan *chan)
+{
+ struct xilinx_axidma_tx_segment *segment;
+ dma_addr_t phys;
+
segment = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &phys);
if (!segment)
return NULL;
@@ -326,26 +524,48 @@ xilinx_vdma_alloc_tx_segment(struct xilinx_vdma_chan *chan)
}
/**
+ * xilinx_dma_free_tx_segment - Free transaction segment
+ * @chan: Driver specific DMA channel
+ * @segment: DMA transaction segment
+ */
+static void xilinx_dma_free_tx_segment(struct xilinx_dma_chan *chan,
+ struct xilinx_axidma_tx_segment *segment)
+{
+ dma_pool_free(chan->desc_pool, segment, segment->phys);
+}
+
+/**
+ * xilinx_cdma_free_tx_segment - Free transaction segment
+ * @chan: Driver specific DMA channel
+ * @segment: DMA transaction segment
+ */
+static void xilinx_cdma_free_tx_segment(struct xilinx_dma_chan *chan,
+ struct xilinx_cdma_tx_segment *segment)
+{
+ dma_pool_free(chan->desc_pool, segment, segment->phys);
+}
+
+/**
* xilinx_vdma_free_tx_segment - Free transaction segment
- * @chan: Driver specific VDMA channel
- * @segment: VDMA transaction segment
+ * @chan: Driver specific DMA channel
+ * @segment: DMA transaction segment
*/
-static void xilinx_vdma_free_tx_segment(struct xilinx_vdma_chan *chan,
+static void xilinx_vdma_free_tx_segment(struct xilinx_dma_chan *chan,
struct xilinx_vdma_tx_segment *segment)
{
dma_pool_free(chan->desc_pool, segment, segment->phys);
}
/**
- * xilinx_vdma_tx_descriptor - Allocate transaction descriptor
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_tx_descriptor - Allocate transaction descriptor
+ * @chan: Driver specific DMA channel
*
* Return: The allocated descriptor on success and NULL on failure.
*/
-static struct xilinx_vdma_tx_descriptor *
-xilinx_vdma_alloc_tx_descriptor(struct xilinx_vdma_chan *chan)
+static struct xilinx_dma_tx_descriptor *
+xilinx_dma_alloc_tx_descriptor(struct xilinx_dma_chan *chan)
{
- struct xilinx_vdma_tx_descriptor *desc;
+ struct xilinx_dma_tx_descriptor *desc;
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
@@ -357,22 +577,38 @@ xilinx_vdma_alloc_tx_descriptor(struct xilinx_vdma_chan *chan)
}
/**
- * xilinx_vdma_free_tx_descriptor - Free transaction descriptor
- * @chan: Driver specific VDMA channel
- * @desc: VDMA transaction descriptor
+ * xilinx_dma_free_tx_descriptor - Free transaction descriptor
+ * @chan: Driver specific DMA channel
+ * @desc: DMA transaction descriptor
*/
static void
-xilinx_vdma_free_tx_descriptor(struct xilinx_vdma_chan *chan,
- struct xilinx_vdma_tx_descriptor *desc)
+xilinx_dma_free_tx_descriptor(struct xilinx_dma_chan *chan,
+ struct xilinx_dma_tx_descriptor *desc)
{
struct xilinx_vdma_tx_segment *segment, *next;
+ struct xilinx_cdma_tx_segment *cdma_segment, *cdma_next;
+ struct xilinx_axidma_tx_segment *axidma_segment, *axidma_next;
if (!desc)
return;
- list_for_each_entry_safe(segment, next, &desc->segments, node) {
- list_del(&segment->node);
- xilinx_vdma_free_tx_segment(chan, segment);
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
+ list_for_each_entry_safe(segment, next, &desc->segments, node) {
+ list_del(&segment->node);
+ xilinx_vdma_free_tx_segment(chan, segment);
+ }
+ } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
+ list_for_each_entry_safe(cdma_segment, cdma_next,
+ &desc->segments, node) {
+ list_del(&cdma_segment->node);
+ xilinx_cdma_free_tx_segment(chan, cdma_segment);
+ }
+ } else {
+ list_for_each_entry_safe(axidma_segment, axidma_next,
+ &desc->segments, node) {
+ list_del(&axidma_segment->node);
+ xilinx_dma_free_tx_segment(chan, axidma_segment);
+ }
}
kfree(desc);
@@ -381,60 +617,62 @@ xilinx_vdma_free_tx_descriptor(struct xilinx_vdma_chan *chan,
/* Required functions */
/**
- * xilinx_vdma_free_desc_list - Free descriptors list
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_free_desc_list - Free descriptors list
+ * @chan: Driver specific DMA channel
* @list: List to parse and delete the descriptor
*/
-static void xilinx_vdma_free_desc_list(struct xilinx_vdma_chan *chan,
+static void xilinx_dma_free_desc_list(struct xilinx_dma_chan *chan,
struct list_head *list)
{
- struct xilinx_vdma_tx_descriptor *desc, *next;
+ struct xilinx_dma_tx_descriptor *desc, *next;
list_for_each_entry_safe(desc, next, list, node) {
list_del(&desc->node);
- xilinx_vdma_free_tx_descriptor(chan, desc);
+ xilinx_dma_free_tx_descriptor(chan, desc);
}
}
/**
- * xilinx_vdma_free_descriptors - Free channel descriptors
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_free_descriptors - Free channel descriptors
+ * @chan: Driver specific DMA channel
*/
-static void xilinx_vdma_free_descriptors(struct xilinx_vdma_chan *chan)
+static void xilinx_dma_free_descriptors(struct xilinx_dma_chan *chan)
{
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
- xilinx_vdma_free_desc_list(chan, &chan->pending_list);
- xilinx_vdma_free_desc_list(chan, &chan->done_list);
- xilinx_vdma_free_desc_list(chan, &chan->active_list);
+ xilinx_dma_free_desc_list(chan, &chan->pending_list);
+ xilinx_dma_free_desc_list(chan, &chan->done_list);
+ xilinx_dma_free_desc_list(chan, &chan->active_list);
spin_unlock_irqrestore(&chan->lock, flags);
}
/**
- * xilinx_vdma_free_chan_resources - Free channel resources
+ * xilinx_dma_free_chan_resources - Free channel resources
* @dchan: DMA channel
*/
-static void xilinx_vdma_free_chan_resources(struct dma_chan *dchan)
+static void xilinx_dma_free_chan_resources(struct dma_chan *dchan)
{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
dev_dbg(chan->dev, "Free all channel resources.\n");
- xilinx_vdma_free_descriptors(chan);
+ xilinx_dma_free_descriptors(chan);
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
+ xilinx_dma_free_tx_segment(chan, chan->seg_v);
dma_pool_destroy(chan->desc_pool);
chan->desc_pool = NULL;
}
/**
- * xilinx_vdma_chan_desc_cleanup - Clean channel descriptors
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_chan_desc_cleanup - Clean channel descriptors
+ * @chan: Driver specific DMA channel
*/
-static void xilinx_vdma_chan_desc_cleanup(struct xilinx_vdma_chan *chan)
+static void xilinx_dma_chan_desc_cleanup(struct xilinx_dma_chan *chan)
{
- struct xilinx_vdma_tx_descriptor *desc, *next;
+ struct xilinx_dma_tx_descriptor *desc, *next;
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
@@ -457,32 +695,32 @@ static void xilinx_vdma_chan_desc_cleanup(struct xilinx_vdma_chan *chan)
/* Run any dependencies, then free the descriptor */
dma_run_dependencies(&desc->async_tx);
- xilinx_vdma_free_tx_descriptor(chan, desc);
+ xilinx_dma_free_tx_descriptor(chan, desc);
}
spin_unlock_irqrestore(&chan->lock, flags);
}
/**
- * xilinx_vdma_do_tasklet - Schedule completion tasklet
- * @data: Pointer to the Xilinx VDMA channel structure
+ * xilinx_dma_do_tasklet - Schedule completion tasklet
+ * @data: Pointer to the Xilinx DMA channel structure
*/
-static void xilinx_vdma_do_tasklet(unsigned long data)
+static void xilinx_dma_do_tasklet(unsigned long data)
{
- struct xilinx_vdma_chan *chan = (struct xilinx_vdma_chan *)data;
+ struct xilinx_dma_chan *chan = (struct xilinx_dma_chan *)data;
- xilinx_vdma_chan_desc_cleanup(chan);
+ xilinx_dma_chan_desc_cleanup(chan);
}
/**
- * xilinx_vdma_alloc_chan_resources - Allocate channel resources
+ * xilinx_dma_alloc_chan_resources - Allocate channel resources
* @dchan: DMA channel
*
* Return: '0' on success and failure value on error
*/
-static int xilinx_vdma_alloc_chan_resources(struct dma_chan *dchan)
+static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
/* Has this channel already been allocated? */
if (chan->desc_pool)
@@ -492,10 +730,26 @@ static int xilinx_vdma_alloc_chan_resources(struct dma_chan *dchan)
* We need the descriptor to be aligned to 64bytes
* for meeting Xilinx VDMA specification requirement.
*/
- chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
- chan->dev,
- sizeof(struct xilinx_vdma_tx_segment),
- __alignof__(struct xilinx_vdma_tx_segment), 0);
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
+ chan->desc_pool = dma_pool_create("xilinx_dma_desc_pool",
+ chan->dev,
+ sizeof(struct xilinx_axidma_tx_segment),
+ __alignof__(struct xilinx_axidma_tx_segment),
+ 0);
+ } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
+ chan->desc_pool = dma_pool_create("xilinx_cdma_desc_pool",
+ chan->dev,
+ sizeof(struct xilinx_cdma_tx_segment),
+ __alignof__(struct xilinx_cdma_tx_segment),
+ 0);
+ } else {
+ chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool",
+ chan->dev,
+ sizeof(struct xilinx_vdma_tx_segment),
+ __alignof__(struct xilinx_vdma_tx_segment),
+ 0);
+ }
+
if (!chan->desc_pool) {
dev_err(chan->dev,
"unable to allocate channel %d descriptor pool\n",
@@ -503,110 +757,160 @@ static int xilinx_vdma_alloc_chan_resources(struct dma_chan *dchan)
return -ENOMEM;
}
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
+ /*
+ * For AXI DMA case after submitting a pending_list, keep
+ * an extra segment allocated so that the "next descriptor"
+ * pointer on the tail descriptor always points to a
+ * valid descriptor, even when paused after reaching taildesc.
+ * This way, it is possible to issue additional
+ * transfers without halting and restarting the channel.
+ */
+ chan->seg_v = xilinx_axidma_alloc_tx_segment(chan);
+
dma_cookie_init(dchan);
+
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
+ /* For AXI DMA resetting once channel will reset the
+ * other channel as well so enable the interrupts here.
+ */
+ dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
+ XILINX_DMA_DMAXR_ALL_IRQ_MASK);
+ }
+
+ if ((chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) && chan->has_sg)
+ dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
+ XILINX_CDMA_CR_SGMODE);
+
return 0;
}
/**
- * xilinx_vdma_tx_status - Get VDMA transaction status
+ * xilinx_dma_tx_status - Get DMA transaction status
* @dchan: DMA channel
* @cookie: Transaction identifier
* @txstate: Transaction state
*
* Return: DMA transaction status
*/
-static enum dma_status xilinx_vdma_tx_status(struct dma_chan *dchan,
+static enum dma_status xilinx_dma_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
- return dma_cookie_status(dchan, cookie, txstate);
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_tx_descriptor *desc;
+ struct xilinx_axidma_tx_segment *segment;
+ struct xilinx_axidma_desc_hw *hw;
+ enum dma_status ret;
+ unsigned long flags;
+ u32 residue = 0;
+
+ ret = dma_cookie_status(dchan, cookie, txstate);
+ if (ret == DMA_COMPLETE || !txstate)
+ return ret;
+
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
+ spin_lock_irqsave(&chan->lock, flags);
+
+ desc = list_last_entry(&chan->active_list,
+ struct xilinx_dma_tx_descriptor, node);
+ if (chan->has_sg) {
+ list_for_each_entry(segment, &desc->segments, node) {
+ hw = &segment->hw;
+ residue += (hw->control - hw->status) &
+ XILINX_DMA_MAX_TRANS_LEN;
+ }
+ }
+ spin_unlock_irqrestore(&chan->lock, flags);
+
+ chan->residue = residue;
+ dma_set_residue(txstate, chan->residue);
+ }
+
+ return ret;
}
/**
- * xilinx_vdma_is_running - Check if VDMA channel is running
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_is_running - Check if DMA channel is running
+ * @chan: Driver specific DMA channel
*
* Return: '1' if running, '0' if not.
*/
-static bool xilinx_vdma_is_running(struct xilinx_vdma_chan *chan)
+static bool xilinx_dma_is_running(struct xilinx_dma_chan *chan)
{
- return !(vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) &
- XILINX_VDMA_DMASR_HALTED) &&
- (vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR) &
- XILINX_VDMA_DMACR_RUNSTOP);
+ return !(dma_ctrl_read(chan, XILINX_DMA_REG_DMASR) &
+ XILINX_DMA_DMASR_HALTED) &&
+ (dma_ctrl_read(chan, XILINX_DMA_REG_DMACR) &
+ XILINX_DMA_DMACR_RUNSTOP);
}
/**
- * xilinx_vdma_is_idle - Check if VDMA channel is idle
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_is_idle - Check if DMA channel is idle
+ * @chan: Driver specific DMA channel
*
* Return: '1' if idle, '0' if not.
*/
-static bool xilinx_vdma_is_idle(struct xilinx_vdma_chan *chan)
+static bool xilinx_dma_is_idle(struct xilinx_dma_chan *chan)
{
- return vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) &
- XILINX_VDMA_DMASR_IDLE;
+ return dma_ctrl_read(chan, XILINX_DMA_REG_DMASR) &
+ XILINX_DMA_DMASR_IDLE;
}
/**
- * xilinx_vdma_halt - Halt VDMA channel
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_halt - Halt DMA channel
+ * @chan: Driver specific DMA channel
*/
-static void xilinx_vdma_halt(struct xilinx_vdma_chan *chan)
+static void xilinx_dma_halt(struct xilinx_dma_chan *chan)
{
int err;
u32 val;
- vdma_ctrl_clr(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RUNSTOP);
+ dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP);
/* Wait for the hardware to halt */
- err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMASR, val,
- (val & XILINX_VDMA_DMASR_HALTED), 0,
- XILINX_VDMA_LOOP_COUNT);
+ err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
+ (val & XILINX_DMA_DMASR_HALTED), 0,
+ XILINX_DMA_LOOP_COUNT);
if (err) {
dev_err(chan->dev, "Cannot stop channel %p: %x\n",
- chan, vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
+ chan, dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
chan->err = true;
}
-
- return;
}
/**
- * xilinx_vdma_start - Start VDMA channel
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_start - Start DMA channel
+ * @chan: Driver specific DMA channel
*/
-static void xilinx_vdma_start(struct xilinx_vdma_chan *chan)
+static void xilinx_dma_start(struct xilinx_dma_chan *chan)
{
int err;
u32 val;
- vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RUNSTOP);
+ dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RUNSTOP);
/* Wait for the hardware to start */
- err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMASR, val,
- !(val & XILINX_VDMA_DMASR_HALTED), 0,
- XILINX_VDMA_LOOP_COUNT);
+ err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
+ !(val & XILINX_DMA_DMASR_HALTED), 0,
+ XILINX_DMA_LOOP_COUNT);
if (err) {
dev_err(chan->dev, "Cannot start channel %p: %x\n",
- chan, vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
+ chan, dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
chan->err = true;
}
-
- return;
}
/**
* xilinx_vdma_start_transfer - Starts VDMA transfer
* @chan: Driver specific channel struct pointer
*/
-static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
+static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
{
struct xilinx_vdma_config *config = &chan->config;
- struct xilinx_vdma_tx_descriptor *desc, *tail_desc;
+ struct xilinx_dma_tx_descriptor *desc, *tail_desc;
u32 reg;
struct xilinx_vdma_tx_segment *tail_segment;
@@ -618,16 +922,16 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
return;
desc = list_first_entry(&chan->pending_list,
- struct xilinx_vdma_tx_descriptor, node);
+ struct xilinx_dma_tx_descriptor, node);
tail_desc = list_last_entry(&chan->pending_list,
- struct xilinx_vdma_tx_descriptor, node);
+ struct xilinx_dma_tx_descriptor, node);
tail_segment = list_last_entry(&tail_desc->segments,
struct xilinx_vdma_tx_segment, node);
/* If it is SG mode and hardware is busy, cannot submit */
- if (chan->has_sg && xilinx_vdma_is_running(chan) &&
- !xilinx_vdma_is_idle(chan)) {
+ if (chan->has_sg && xilinx_dma_is_running(chan) &&
+ !xilinx_dma_is_idle(chan)) {
dev_dbg(chan->dev, "DMA controller still busy\n");
return;
}
@@ -637,19 +941,19 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
* done, start new transfers
*/
if (chan->has_sg)
- vdma_ctrl_write(chan, XILINX_VDMA_REG_CURDESC,
+ dma_ctrl_write(chan, XILINX_DMA_REG_CURDESC,
desc->async_tx.phys);
/* Configure the hardware using info in the config structure */
- reg = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR);
+ reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
if (config->frm_cnt_en)
- reg |= XILINX_VDMA_DMACR_FRAMECNT_EN;
+ reg |= XILINX_DMA_DMACR_FRAMECNT_EN;
else
- reg &= ~XILINX_VDMA_DMACR_FRAMECNT_EN;
+ reg &= ~XILINX_DMA_DMACR_FRAMECNT_EN;
/* Configure channel to allow number frame buffers */
- vdma_ctrl_write(chan, XILINX_VDMA_REG_FRMSTORE,
+ dma_ctrl_write(chan, XILINX_DMA_REG_FRMSTORE,
chan->desc_pendingcount);
/*
@@ -657,45 +961,53 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
* In direct register mode, if not parking, enable circular mode
*/
if (chan->has_sg || !config->park)
- reg |= XILINX_VDMA_DMACR_CIRC_EN;
+ reg |= XILINX_DMA_DMACR_CIRC_EN;
if (config->park)
- reg &= ~XILINX_VDMA_DMACR_CIRC_EN;
+ reg &= ~XILINX_DMA_DMACR_CIRC_EN;
- vdma_ctrl_write(chan, XILINX_VDMA_REG_DMACR, reg);
+ dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
if (config->park && (config->park_frm >= 0) &&
(config->park_frm < chan->num_frms)) {
if (chan->direction == DMA_MEM_TO_DEV)
- vdma_write(chan, XILINX_VDMA_REG_PARK_PTR,
+ dma_write(chan, XILINX_DMA_REG_PARK_PTR,
config->park_frm <<
- XILINX_VDMA_PARK_PTR_RD_REF_SHIFT);
+ XILINX_DMA_PARK_PTR_RD_REF_SHIFT);
else
- vdma_write(chan, XILINX_VDMA_REG_PARK_PTR,
+ dma_write(chan, XILINX_DMA_REG_PARK_PTR,
config->park_frm <<
- XILINX_VDMA_PARK_PTR_WR_REF_SHIFT);
+ XILINX_DMA_PARK_PTR_WR_REF_SHIFT);
}
/* Start the hardware */
- xilinx_vdma_start(chan);
+ xilinx_dma_start(chan);
if (chan->err)
return;
/* Start the transfer */
if (chan->has_sg) {
- vdma_ctrl_write(chan, XILINX_VDMA_REG_TAILDESC,
+ dma_ctrl_write(chan, XILINX_DMA_REG_TAILDESC,
tail_segment->phys);
} else {
struct xilinx_vdma_tx_segment *segment, *last = NULL;
int i = 0;
- list_for_each_entry(desc, &chan->pending_list, node) {
- segment = list_first_entry(&desc->segments,
- struct xilinx_vdma_tx_segment, node);
- vdma_desc_write(chan,
+ if (chan->desc_submitcount < chan->num_frms)
+ i = chan->desc_submitcount;
+
+ list_for_each_entry(segment, &desc->segments, node) {
+ if (chan->ext_addr)
+ vdma_desc_write_64(chan,
+ XILINX_VDMA_REG_START_ADDRESS_64(i++),
+ segment->hw.buf_addr,
+ segment->hw.buf_addr_msb);
+ else
+ vdma_desc_write(chan,
XILINX_VDMA_REG_START_ADDRESS(i++),
segment->hw.buf_addr);
+
last = segment;
}
@@ -703,10 +1015,164 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
return;
/* HW expects these parameters to be same for one transaction */
- vdma_desc_write(chan, XILINX_VDMA_REG_HSIZE, last->hw.hsize);
- vdma_desc_write(chan, XILINX_VDMA_REG_FRMDLY_STRIDE,
+ vdma_desc_write(chan, XILINX_DMA_REG_HSIZE, last->hw.hsize);
+ vdma_desc_write(chan, XILINX_DMA_REG_FRMDLY_STRIDE,
last->hw.stride);
- vdma_desc_write(chan, XILINX_VDMA_REG_VSIZE, last->hw.vsize);
+ vdma_desc_write(chan, XILINX_DMA_REG_VSIZE, last->hw.vsize);
+ }
+
+ if (!chan->has_sg) {
+ list_del(&desc->node);
+ list_add_tail(&desc->node, &chan->active_list);
+ chan->desc_submitcount++;
+ chan->desc_pendingcount--;
+ if (chan->desc_submitcount == chan->num_frms)
+ chan->desc_submitcount = 0;
+ } else {
+ list_splice_tail_init(&chan->pending_list, &chan->active_list);
+ chan->desc_pendingcount = 0;
+ }
+}
+
+/**
+ * xilinx_cdma_start_transfer - Starts cdma transfer
+ * @chan: Driver specific channel struct pointer
+ */
+static void xilinx_cdma_start_transfer(struct xilinx_dma_chan *chan)
+{
+ struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
+ struct xilinx_cdma_tx_segment *tail_segment;
+ u32 ctrl_reg = dma_read(chan, XILINX_DMA_REG_DMACR);
+
+ if (chan->err)
+ return;
+
+ if (list_empty(&chan->pending_list))
+ return;
+
+ head_desc = list_first_entry(&chan->pending_list,
+ struct xilinx_dma_tx_descriptor, node);
+ tail_desc = list_last_entry(&chan->pending_list,
+ struct xilinx_dma_tx_descriptor, node);
+ tail_segment = list_last_entry(&tail_desc->segments,
+ struct xilinx_cdma_tx_segment, node);
+
+ if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
+ ctrl_reg &= ~XILINX_DMA_CR_COALESCE_MAX;
+ ctrl_reg |= chan->desc_pendingcount <<
+ XILINX_DMA_CR_COALESCE_SHIFT;
+ dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, ctrl_reg);
+ }
+
+ if (chan->has_sg) {
+ dma_ctrl_write(chan, XILINX_DMA_REG_CURDESC,
+ head_desc->async_tx.phys);
+
+ /* Update tail ptr register which will start the transfer */
+ dma_ctrl_write(chan, XILINX_DMA_REG_TAILDESC,
+ tail_segment->phys);
+ } else {
+ /* In simple mode */
+ struct xilinx_cdma_tx_segment *segment;
+ struct xilinx_cdma_desc_hw *hw;
+
+ segment = list_first_entry(&head_desc->segments,
+ struct xilinx_cdma_tx_segment,
+ node);
+
+ hw = &segment->hw;
+
+ dma_ctrl_write(chan, XILINX_CDMA_REG_SRCADDR, hw->src_addr);
+ dma_ctrl_write(chan, XILINX_CDMA_REG_DSTADDR, hw->dest_addr);
+
+ /* Start the transfer */
+ dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
+ hw->control & XILINX_DMA_MAX_TRANS_LEN);
+ }
+
+ list_splice_tail_init(&chan->pending_list, &chan->active_list);
+ chan->desc_pendingcount = 0;
+}
+
+/**
+ * xilinx_dma_start_transfer - Starts DMA transfer
+ * @chan: Driver specific channel struct pointer
+ */
+static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan)
+{
+ struct xilinx_dma_tx_descriptor *head_desc, *tail_desc;
+ struct xilinx_axidma_tx_segment *tail_segment, *old_head, *new_head;
+ u32 reg;
+
+ if (chan->err)
+ return;
+
+ if (list_empty(&chan->pending_list))
+ return;
+
+ /* If it is SG mode and hardware is busy, cannot submit */
+ if (chan->has_sg && xilinx_dma_is_running(chan) &&
+ !xilinx_dma_is_idle(chan)) {
+ dev_dbg(chan->dev, "DMA controller still busy\n");
+ return;
+ }
+
+ head_desc = list_first_entry(&chan->pending_list,
+ struct xilinx_dma_tx_descriptor, node);
+ tail_desc = list_last_entry(&chan->pending_list,
+ struct xilinx_dma_tx_descriptor, node);
+ tail_segment = list_last_entry(&tail_desc->segments,
+ struct xilinx_axidma_tx_segment, node);
+
+ old_head = list_first_entry(&head_desc->segments,
+ struct xilinx_axidma_tx_segment, node);
+ new_head = chan->seg_v;
+ /* Copy Buffer Descriptor fields. */
+ new_head->hw = old_head->hw;
+
+ /* Swap and save new reserve */
+ list_replace_init(&old_head->node, &new_head->node);
+ chan->seg_v = old_head;
+
+ tail_segment->hw.next_desc = chan->seg_v->phys;
+ head_desc->async_tx.phys = new_head->phys;
+
+ reg = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
+
+ if (chan->desc_pendingcount <= XILINX_DMA_COALESCE_MAX) {
+ reg &= ~XILINX_DMA_CR_COALESCE_MAX;
+ reg |= chan->desc_pendingcount <<
+ XILINX_DMA_CR_COALESCE_SHIFT;
+ dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
+ }
+
+ if (chan->has_sg)
+ dma_ctrl_write(chan, XILINX_DMA_REG_CURDESC,
+ head_desc->async_tx.phys);
+
+ xilinx_dma_start(chan);
+
+ if (chan->err)
+ return;
+
+ /* Start the transfer */
+ if (chan->has_sg) {
+ dma_ctrl_write(chan, XILINX_DMA_REG_TAILDESC,
+ tail_segment->phys);
+ } else {
+ struct xilinx_axidma_tx_segment *segment;
+ struct xilinx_axidma_desc_hw *hw;
+
+ segment = list_first_entry(&head_desc->segments,
+ struct xilinx_axidma_tx_segment,
+ node);
+ hw = &segment->hw;
+
+ dma_ctrl_write(chan, XILINX_DMA_REG_SRCDSTADDR, hw->buf_addr);
+
+ /* Start the transfer */
+ dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
+ hw->control & XILINX_DMA_MAX_TRANS_LEN);
}
list_splice_tail_init(&chan->pending_list, &chan->active_list);
@@ -714,28 +1180,28 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
}
/**
- * xilinx_vdma_issue_pending - Issue pending transactions
+ * xilinx_dma_issue_pending - Issue pending transactions
* @dchan: DMA channel
*/
-static void xilinx_vdma_issue_pending(struct dma_chan *dchan)
+static void xilinx_dma_issue_pending(struct dma_chan *dchan)
{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
unsigned long flags;
spin_lock_irqsave(&chan->lock, flags);
- xilinx_vdma_start_transfer(chan);
+ chan->start_transfer(chan);
spin_unlock_irqrestore(&chan->lock, flags);
}
/**
- * xilinx_vdma_complete_descriptor - Mark the active descriptor as complete
+ * xilinx_dma_complete_descriptor - Mark the active descriptor as complete
* @chan : xilinx DMA channel
*
* CONTEXT: hardirq
*/
-static void xilinx_vdma_complete_descriptor(struct xilinx_vdma_chan *chan)
+static void xilinx_dma_complete_descriptor(struct xilinx_dma_chan *chan)
{
- struct xilinx_vdma_tx_descriptor *desc, *next;
+ struct xilinx_dma_tx_descriptor *desc, *next;
/* This function was invoked with lock held */
if (list_empty(&chan->active_list))
@@ -749,27 +1215,27 @@ static void xilinx_vdma_complete_descriptor(struct xilinx_vdma_chan *chan)
}
/**
- * xilinx_vdma_reset - Reset VDMA channel
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_reset - Reset DMA channel
+ * @chan: Driver specific DMA channel
*
* Return: '0' on success and failure value on error
*/
-static int xilinx_vdma_reset(struct xilinx_vdma_chan *chan)
+static int xilinx_dma_reset(struct xilinx_dma_chan *chan)
{
int err;
u32 tmp;
- vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RESET);
+ dma_ctrl_set(chan, XILINX_DMA_REG_DMACR, XILINX_DMA_DMACR_RESET);
/* Wait for the hardware to finish reset */
- err = xilinx_vdma_poll_timeout(chan, XILINX_VDMA_REG_DMACR, tmp,
- !(tmp & XILINX_VDMA_DMACR_RESET), 0,
- XILINX_VDMA_LOOP_COUNT);
+ err = xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMACR, tmp,
+ !(tmp & XILINX_DMA_DMACR_RESET), 0,
+ XILINX_DMA_LOOP_COUNT);
if (err) {
dev_err(chan->dev, "reset timeout, cr %x, sr %x\n",
- vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR),
- vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR));
+ dma_ctrl_read(chan, XILINX_DMA_REG_DMACR),
+ dma_ctrl_read(chan, XILINX_DMA_REG_DMASR));
return -ETIMEDOUT;
}
@@ -779,48 +1245,48 @@ static int xilinx_vdma_reset(struct xilinx_vdma_chan *chan)
}
/**
- * xilinx_vdma_chan_reset - Reset VDMA channel and enable interrupts
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_chan_reset - Reset DMA channel and enable interrupts
+ * @chan: Driver specific DMA channel
*
* Return: '0' on success and failure value on error
*/
-static int xilinx_vdma_chan_reset(struct xilinx_vdma_chan *chan)
+static int xilinx_dma_chan_reset(struct xilinx_dma_chan *chan)
{
int err;
/* Reset VDMA */
- err = xilinx_vdma_reset(chan);
+ err = xilinx_dma_reset(chan);
if (err)
return err;
/* Enable interrupts */
- vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR,
- XILINX_VDMA_DMAXR_ALL_IRQ_MASK);
+ dma_ctrl_set(chan, XILINX_DMA_REG_DMACR,
+ XILINX_DMA_DMAXR_ALL_IRQ_MASK);
return 0;
}
/**
- * xilinx_vdma_irq_handler - VDMA Interrupt handler
+ * xilinx_dma_irq_handler - DMA Interrupt handler
* @irq: IRQ number
- * @data: Pointer to the Xilinx VDMA channel structure
+ * @data: Pointer to the Xilinx DMA channel structure
*
* Return: IRQ_HANDLED/IRQ_NONE
*/
-static irqreturn_t xilinx_vdma_irq_handler(int irq, void *data)
+static irqreturn_t xilinx_dma_irq_handler(int irq, void *data)
{
- struct xilinx_vdma_chan *chan = data;
+ struct xilinx_dma_chan *chan = data;
u32 status;
/* Read the status and ack the interrupts. */
- status = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR);
- if (!(status & XILINX_VDMA_DMAXR_ALL_IRQ_MASK))
+ status = dma_ctrl_read(chan, XILINX_DMA_REG_DMASR);
+ if (!(status & XILINX_DMA_DMAXR_ALL_IRQ_MASK))
return IRQ_NONE;
- vdma_ctrl_write(chan, XILINX_VDMA_REG_DMASR,
- status & XILINX_VDMA_DMAXR_ALL_IRQ_MASK);
+ dma_ctrl_write(chan, XILINX_DMA_REG_DMASR,
+ status & XILINX_DMA_DMAXR_ALL_IRQ_MASK);
- if (status & XILINX_VDMA_DMASR_ERR_IRQ) {
+ if (status & XILINX_DMA_DMASR_ERR_IRQ) {
/*
* An error occurred. If C_FLUSH_ON_FSYNC is enabled and the
* error is recoverable, ignore it. Otherwise flag the error.
@@ -828,22 +1294,23 @@ static irqreturn_t xilinx_vdma_irq_handler(int irq, void *data)
* Only recoverable errors can be cleared in the DMASR register,
* make sure not to write to other error bits to 1.
*/
- u32 errors = status & XILINX_VDMA_DMASR_ALL_ERR_MASK;
- vdma_ctrl_write(chan, XILINX_VDMA_REG_DMASR,
- errors & XILINX_VDMA_DMASR_ERR_RECOVER_MASK);
+ u32 errors = status & XILINX_DMA_DMASR_ALL_ERR_MASK;
+
+ dma_ctrl_write(chan, XILINX_DMA_REG_DMASR,
+ errors & XILINX_DMA_DMASR_ERR_RECOVER_MASK);
if (!chan->flush_on_fsync ||
- (errors & ~XILINX_VDMA_DMASR_ERR_RECOVER_MASK)) {
+ (errors & ~XILINX_DMA_DMASR_ERR_RECOVER_MASK)) {
dev_err(chan->dev,
"Channel %p has errors %x, cdr %x tdr %x\n",
chan, errors,
- vdma_ctrl_read(chan, XILINX_VDMA_REG_CURDESC),
- vdma_ctrl_read(chan, XILINX_VDMA_REG_TAILDESC));
+ dma_ctrl_read(chan, XILINX_DMA_REG_CURDESC),
+ dma_ctrl_read(chan, XILINX_DMA_REG_TAILDESC));
chan->err = true;
}
}
- if (status & XILINX_VDMA_DMASR_DLY_CNT_IRQ) {
+ if (status & XILINX_DMA_DMASR_DLY_CNT_IRQ) {
/*
* Device takes too long to do the transfer when user requires
* responsiveness.
@@ -851,10 +1318,10 @@ static irqreturn_t xilinx_vdma_irq_handler(int irq, void *data)
dev_dbg(chan->dev, "Inter-packet latency too long\n");
}
- if (status & XILINX_VDMA_DMASR_FRM_CNT_IRQ) {
+ if (status & XILINX_DMA_DMASR_FRM_CNT_IRQ) {
spin_lock(&chan->lock);
- xilinx_vdma_complete_descriptor(chan);
- xilinx_vdma_start_transfer(chan);
+ xilinx_dma_complete_descriptor(chan);
+ chan->start_transfer(chan);
spin_unlock(&chan->lock);
}
@@ -867,11 +1334,13 @@ static irqreturn_t xilinx_vdma_irq_handler(int irq, void *data)
* @chan: Driver specific dma channel
* @desc: dma transaction descriptor
*/
-static void append_desc_queue(struct xilinx_vdma_chan *chan,
- struct xilinx_vdma_tx_descriptor *desc)
+static void append_desc_queue(struct xilinx_dma_chan *chan,
+ struct xilinx_dma_tx_descriptor *desc)
{
struct xilinx_vdma_tx_segment *tail_segment;
- struct xilinx_vdma_tx_descriptor *tail_desc;
+ struct xilinx_dma_tx_descriptor *tail_desc;
+ struct xilinx_axidma_tx_segment *axidma_tail_segment;
+ struct xilinx_cdma_tx_segment *cdma_tail_segment;
if (list_empty(&chan->pending_list))
goto append;
@@ -881,10 +1350,23 @@ static void append_desc_queue(struct xilinx_vdma_chan *chan,
* that already exists in memory.
*/
tail_desc = list_last_entry(&chan->pending_list,
- struct xilinx_vdma_tx_descriptor, node);
- tail_segment = list_last_entry(&tail_desc->segments,
- struct xilinx_vdma_tx_segment, node);
- tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
+ struct xilinx_dma_tx_descriptor, node);
+ if (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
+ tail_segment = list_last_entry(&tail_desc->segments,
+ struct xilinx_vdma_tx_segment,
+ node);
+ tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
+ } else if (chan->xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
+ cdma_tail_segment = list_last_entry(&tail_desc->segments,
+ struct xilinx_cdma_tx_segment,
+ node);
+ cdma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
+ } else {
+ axidma_tail_segment = list_last_entry(&tail_desc->segments,
+ struct xilinx_axidma_tx_segment,
+ node);
+ axidma_tail_segment->hw.next_desc = (u32)desc->async_tx.phys;
+ }
/*
* Add the software descriptor and all children to the list
@@ -894,22 +1376,23 @@ append:
list_add_tail(&desc->node, &chan->pending_list);
chan->desc_pendingcount++;
- if (unlikely(chan->desc_pendingcount > chan->num_frms)) {
+ if (chan->has_sg && (chan->xdev->dma_config->dmatype == XDMA_TYPE_VDMA)
+ && unlikely(chan->desc_pendingcount > chan->num_frms)) {
dev_dbg(chan->dev, "desc pendingcount is too high\n");
chan->desc_pendingcount = chan->num_frms;
}
}
/**
- * xilinx_vdma_tx_submit - Submit DMA transaction
+ * xilinx_dma_tx_submit - Submit DMA transaction
* @tx: Async transaction descriptor
*
* Return: cookie value on success and failure value on error
*/
-static dma_cookie_t xilinx_vdma_tx_submit(struct dma_async_tx_descriptor *tx)
+static dma_cookie_t xilinx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
- struct xilinx_vdma_tx_descriptor *desc = to_vdma_tx_descriptor(tx);
- struct xilinx_vdma_chan *chan = to_xilinx_chan(tx->chan);
+ struct xilinx_dma_tx_descriptor *desc = to_dma_tx_descriptor(tx);
+ struct xilinx_dma_chan *chan = to_xilinx_chan(tx->chan);
dma_cookie_t cookie;
unsigned long flags;
int err;
@@ -919,7 +1402,7 @@ static dma_cookie_t xilinx_vdma_tx_submit(struct dma_async_tx_descriptor *tx)
* If reset fails, need to hard reset the system.
* Channel is no longer functional
*/
- err = xilinx_vdma_chan_reset(chan);
+ err = xilinx_dma_chan_reset(chan);
if (err < 0)
return err;
}
@@ -950,8 +1433,8 @@ xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
struct dma_interleaved_template *xt,
unsigned long flags)
{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
- struct xilinx_vdma_tx_descriptor *desc;
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_tx_descriptor *desc;
struct xilinx_vdma_tx_segment *segment, *prev = NULL;
struct xilinx_vdma_desc_hw *hw;
@@ -965,12 +1448,12 @@ xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
return NULL;
/* Allocate a transaction descriptor. */
- desc = xilinx_vdma_alloc_tx_descriptor(chan);
+ desc = xilinx_dma_alloc_tx_descriptor(chan);
if (!desc)
return NULL;
dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
- desc->async_tx.tx_submit = xilinx_vdma_tx_submit;
+ desc->async_tx.tx_submit = xilinx_dma_tx_submit;
async_tx_ack(&desc->async_tx);
/* Allocate the link descriptor from DMA pool */
@@ -983,14 +1466,25 @@ xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
hw->vsize = xt->numf;
hw->hsize = xt->sgl[0].size;
hw->stride = (xt->sgl[0].icg + xt->sgl[0].size) <<
- XILINX_VDMA_FRMDLY_STRIDE_STRIDE_SHIFT;
+ XILINX_DMA_FRMDLY_STRIDE_STRIDE_SHIFT;
hw->stride |= chan->config.frm_dly <<
- XILINX_VDMA_FRMDLY_STRIDE_FRMDLY_SHIFT;
-
- if (xt->dir != DMA_MEM_TO_DEV)
- hw->buf_addr = xt->dst_start;
- else
- hw->buf_addr = xt->src_start;
+ XILINX_DMA_FRMDLY_STRIDE_FRMDLY_SHIFT;
+
+ if (xt->dir != DMA_MEM_TO_DEV) {
+ if (chan->ext_addr) {
+ hw->buf_addr = lower_32_bits(xt->dst_start);
+ hw->buf_addr_msb = upper_32_bits(xt->dst_start);
+ } else {
+ hw->buf_addr = xt->dst_start;
+ }
+ } else {
+ if (chan->ext_addr) {
+ hw->buf_addr = lower_32_bits(xt->src_start);
+ hw->buf_addr_msb = upper_32_bits(xt->src_start);
+ } else {
+ hw->buf_addr = xt->src_start;
+ }
+ }
/* Insert the segment into the descriptor segments list. */
list_add_tail(&segment->node, &desc->segments);
@@ -1005,29 +1499,194 @@ xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan,
return &desc->async_tx;
error:
- xilinx_vdma_free_tx_descriptor(chan, desc);
+ xilinx_dma_free_tx_descriptor(chan, desc);
+ return NULL;
+}
+
+/**
+ * xilinx_cdma_prep_memcpy - prepare descriptors for a memcpy transaction
+ * @dchan: DMA channel
+ * @dma_dst: destination address
+ * @dma_src: source address
+ * @len: transfer length
+ * @flags: transfer ack flags
+ *
+ * Return: Async transaction descriptor on success and NULL on failure
+ */
+static struct dma_async_tx_descriptor *
+xilinx_cdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst,
+ dma_addr_t dma_src, size_t len, unsigned long flags)
+{
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_tx_descriptor *desc;
+ struct xilinx_cdma_tx_segment *segment, *prev;
+ struct xilinx_cdma_desc_hw *hw;
+
+ if (!len || len > XILINX_DMA_MAX_TRANS_LEN)
+ return NULL;
+
+ desc = xilinx_dma_alloc_tx_descriptor(chan);
+ if (!desc)
+ return NULL;
+
+ dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
+ desc->async_tx.tx_submit = xilinx_dma_tx_submit;
+
+ /* Allocate the link descriptor from DMA pool */
+ segment = xilinx_cdma_alloc_tx_segment(chan);
+ if (!segment)
+ goto error;
+
+ hw = &segment->hw;
+ hw->control = len;
+ hw->src_addr = dma_src;
+ hw->dest_addr = dma_dst;
+
+ /* Fill the previous next descriptor with current */
+ prev = list_last_entry(&desc->segments,
+ struct xilinx_cdma_tx_segment, node);
+ prev->hw.next_desc = segment->phys;
+
+ /* Insert the segment into the descriptor segments list. */
+ list_add_tail(&segment->node, &desc->segments);
+
+ prev = segment;
+
+ /* Link the last hardware descriptor with the first. */
+ segment = list_first_entry(&desc->segments,
+ struct xilinx_cdma_tx_segment, node);
+ desc->async_tx.phys = segment->phys;
+ prev->hw.next_desc = segment->phys;
+
+ return &desc->async_tx;
+
+error:
+ xilinx_dma_free_tx_descriptor(chan, desc);
+ return NULL;
+}
+
+/**
+ * xilinx_dma_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction
+ * @dchan: DMA channel
+ * @sgl: scatterlist to transfer to/from
+ * @sg_len: number of entries in @scatterlist
+ * @direction: DMA direction
+ * @flags: transfer ack flags
+ * @context: APP words of the descriptor
+ *
+ * Return: Async transaction descriptor on success and NULL on failure
+ */
+static struct dma_async_tx_descriptor *xilinx_dma_prep_slave_sg(
+ struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len,
+ enum dma_transfer_direction direction, unsigned long flags,
+ void *context)
+{
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_tx_descriptor *desc;
+ struct xilinx_axidma_tx_segment *segment = NULL, *prev = NULL;
+ u32 *app_w = (u32 *)context;
+ struct scatterlist *sg;
+ size_t copy;
+ size_t sg_used;
+ unsigned int i;
+
+ if (!is_slave_direction(direction))
+ return NULL;
+
+ /* Allocate a transaction descriptor. */
+ desc = xilinx_dma_alloc_tx_descriptor(chan);
+ if (!desc)
+ return NULL;
+
+ dma_async_tx_descriptor_init(&desc->async_tx, &chan->common);
+ desc->async_tx.tx_submit = xilinx_dma_tx_submit;
+
+ /* Build transactions using information in the scatter gather list */
+ for_each_sg(sgl, sg, sg_len, i) {
+ sg_used = 0;
+
+ /* Loop until the entire scatterlist entry is used */
+ while (sg_used < sg_dma_len(sg)) {
+ struct xilinx_axidma_desc_hw *hw;
+
+ /* Get a free segment */
+ segment = xilinx_axidma_alloc_tx_segment(chan);
+ if (!segment)
+ goto error;
+
+ /*
+ * Calculate the maximum number of bytes to transfer,
+ * making sure it is less than the hw limit
+ */
+ copy = min_t(size_t, sg_dma_len(sg) - sg_used,
+ XILINX_DMA_MAX_TRANS_LEN);
+ hw = &segment->hw;
+
+ /* Fill in the descriptor */
+ hw->buf_addr = sg_dma_address(sg) + sg_used;
+
+ hw->control = copy;
+
+ if (chan->direction == DMA_MEM_TO_DEV) {
+ if (app_w)
+ memcpy(hw->app, app_w, sizeof(u32) *
+ XILINX_DMA_NUM_APP_WORDS);
+ }
+
+ if (prev)
+ prev->hw.next_desc = segment->phys;
+
+ prev = segment;
+ sg_used += copy;
+
+ /*
+ * Insert the segment into the descriptor segments
+ * list.
+ */
+ list_add_tail(&segment->node, &desc->segments);
+ }
+ }
+
+ segment = list_first_entry(&desc->segments,
+ struct xilinx_axidma_tx_segment, node);
+ desc->async_tx.phys = segment->phys;
+ prev->hw.next_desc = segment->phys;
+
+ /* For the last DMA_MEM_TO_DEV transfer, set EOP */
+ if (chan->direction == DMA_MEM_TO_DEV) {
+ segment->hw.control |= XILINX_DMA_BD_SOP;
+ segment = list_last_entry(&desc->segments,
+ struct xilinx_axidma_tx_segment,
+ node);
+ segment->hw.control |= XILINX_DMA_BD_EOP;
+ }
+
+ return &desc->async_tx;
+
+error:
+ xilinx_dma_free_tx_descriptor(chan, desc);
return NULL;
}
/**
- * xilinx_vdma_terminate_all - Halt the channel and free descriptors
- * @chan: Driver specific VDMA Channel pointer
+ * xilinx_dma_terminate_all - Halt the channel and free descriptors
+ * @chan: Driver specific DMA Channel pointer
*/
-static int xilinx_vdma_terminate_all(struct dma_chan *dchan)
+static int xilinx_dma_terminate_all(struct dma_chan *dchan)
{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
/* Halt the DMA engine */
- xilinx_vdma_halt(chan);
+ xilinx_dma_halt(chan);
/* Remove and free all of the descriptors in the lists */
- xilinx_vdma_free_descriptors(chan);
+ xilinx_dma_free_descriptors(chan);
return 0;
}
/**
- * xilinx_vdma_channel_set_config - Configure VDMA channel
+ * xilinx_dma_channel_set_config - Configure VDMA channel
* Run-time configuration for Axi VDMA, supports:
* . halt the channel
* . configure interrupt coalescing and inter-packet delay threshold
@@ -1042,13 +1701,13 @@ static int xilinx_vdma_terminate_all(struct dma_chan *dchan)
int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
struct xilinx_vdma_config *cfg)
{
- struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan);
+ struct xilinx_dma_chan *chan = to_xilinx_chan(dchan);
u32 dmacr;
if (cfg->reset)
- return xilinx_vdma_chan_reset(chan);
+ return xilinx_dma_chan_reset(chan);
- dmacr = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR);
+ dmacr = dma_ctrl_read(chan, XILINX_DMA_REG_DMACR);
chan->config.frm_dly = cfg->frm_dly;
chan->config.park = cfg->park;
@@ -1058,8 +1717,8 @@ int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
chan->config.master = cfg->master;
if (cfg->gen_lock && chan->genlock) {
- dmacr |= XILINX_VDMA_DMACR_GENLOCK_EN;
- dmacr |= cfg->master << XILINX_VDMA_DMACR_MASTER_SHIFT;
+ dmacr |= XILINX_DMA_DMACR_GENLOCK_EN;
+ dmacr |= cfg->master << XILINX_DMA_DMACR_MASTER_SHIFT;
}
chan->config.frm_cnt_en = cfg->frm_cnt_en;
@@ -1071,21 +1730,21 @@ int xilinx_vdma_channel_set_config(struct dma_chan *dchan,
chan->config.coalesc = cfg->coalesc;
chan->config.delay = cfg->delay;
- if (cfg->coalesc <= XILINX_VDMA_DMACR_FRAME_COUNT_MAX) {
- dmacr |= cfg->coalesc << XILINX_VDMA_DMACR_FRAME_COUNT_SHIFT;
+ if (cfg->coalesc <= XILINX_DMA_DMACR_FRAME_COUNT_MAX) {
+ dmacr |= cfg->coalesc << XILINX_DMA_DMACR_FRAME_COUNT_SHIFT;
chan->config.coalesc = cfg->coalesc;
}
- if (cfg->delay <= XILINX_VDMA_DMACR_DELAY_MAX) {
- dmacr |= cfg->delay << XILINX_VDMA_DMACR_DELAY_SHIFT;
+ if (cfg->delay <= XILINX_DMA_DMACR_DELAY_MAX) {
+ dmacr |= cfg->delay << XILINX_DMA_DMACR_DELAY_SHIFT;
chan->config.delay = cfg->delay;
}
/* FSync Source selection */
- dmacr &= ~XILINX_VDMA_DMACR_FSYNCSRC_MASK;
- dmacr |= cfg->ext_fsync << XILINX_VDMA_DMACR_FSYNCSRC_SHIFT;
+ dmacr &= ~XILINX_DMA_DMACR_FSYNCSRC_MASK;
+ dmacr |= cfg->ext_fsync << XILINX_DMA_DMACR_FSYNCSRC_SHIFT;
- vdma_ctrl_write(chan, XILINX_VDMA_REG_DMACR, dmacr);
+ dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, dmacr);
return 0;
}
@@ -1096,14 +1755,14 @@ EXPORT_SYMBOL(xilinx_vdma_channel_set_config);
*/
/**
- * xilinx_vdma_chan_remove - Per Channel remove function
- * @chan: Driver specific VDMA channel
+ * xilinx_dma_chan_remove - Per Channel remove function
+ * @chan: Driver specific DMA channel
*/
-static void xilinx_vdma_chan_remove(struct xilinx_vdma_chan *chan)
+static void xilinx_dma_chan_remove(struct xilinx_dma_chan *chan)
{
/* Disable all interrupts */
- vdma_ctrl_clr(chan, XILINX_VDMA_REG_DMACR,
- XILINX_VDMA_DMAXR_ALL_IRQ_MASK);
+ dma_ctrl_clr(chan, XILINX_DMA_REG_DMACR,
+ XILINX_DMA_DMAXR_ALL_IRQ_MASK);
if (chan->irq > 0)
free_irq(chan->irq, chan);
@@ -1113,8 +1772,197 @@ static void xilinx_vdma_chan_remove(struct xilinx_vdma_chan *chan)
list_del(&chan->common.device_node);
}
+static int axidma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
+ struct clk **tx_clk, struct clk **rx_clk,
+ struct clk **sg_clk, struct clk **tmp_clk)
+{
+ int err;
+
+ *tmp_clk = NULL;
+
+ *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
+ if (IS_ERR(*axi_clk)) {
+ err = PTR_ERR(*axi_clk);
+ dev_err(&pdev->dev, "failed to get axi_aclk (%u)\n", err);
+ return err;
+ }
+
+ *tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk");
+ if (IS_ERR(*tx_clk))
+ *tx_clk = NULL;
+
+ *rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk");
+ if (IS_ERR(*rx_clk))
+ *rx_clk = NULL;
+
+ *sg_clk = devm_clk_get(&pdev->dev, "m_axi_sg_aclk");
+ if (IS_ERR(*sg_clk))
+ *sg_clk = NULL;
+
+ err = clk_prepare_enable(*axi_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable axi_clk (%u)\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(*tx_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
+ goto err_disable_axiclk;
+ }
+
+ err = clk_prepare_enable(*rx_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable rx_clk (%u)\n", err);
+ goto err_disable_txclk;
+ }
+
+ err = clk_prepare_enable(*sg_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable sg_clk (%u)\n", err);
+ goto err_disable_rxclk;
+ }
+
+ return 0;
+
+err_disable_rxclk:
+ clk_disable_unprepare(*rx_clk);
+err_disable_txclk:
+ clk_disable_unprepare(*tx_clk);
+err_disable_axiclk:
+ clk_disable_unprepare(*axi_clk);
+
+ return err;
+}
+
+static int axicdma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
+ struct clk **dev_clk, struct clk **tmp_clk,
+ struct clk **tmp1_clk, struct clk **tmp2_clk)
+{
+ int err;
+
+ *tmp_clk = NULL;
+ *tmp1_clk = NULL;
+ *tmp2_clk = NULL;
+
+ *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
+ if (IS_ERR(*axi_clk)) {
+ err = PTR_ERR(*axi_clk);
+ dev_err(&pdev->dev, "failed to get axi_clk (%u)\n", err);
+ return err;
+ }
+
+ *dev_clk = devm_clk_get(&pdev->dev, "m_axi_aclk");
+ if (IS_ERR(*dev_clk)) {
+ err = PTR_ERR(*dev_clk);
+ dev_err(&pdev->dev, "failed to get dev_clk (%u)\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(*axi_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable axi_clk (%u)\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(*dev_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable dev_clk (%u)\n", err);
+ goto err_disable_axiclk;
+ }
+
+ return 0;
+
+err_disable_axiclk:
+ clk_disable_unprepare(*axi_clk);
+
+ return err;
+}
+
+static int axivdma_clk_init(struct platform_device *pdev, struct clk **axi_clk,
+ struct clk **tx_clk, struct clk **txs_clk,
+ struct clk **rx_clk, struct clk **rxs_clk)
+{
+ int err;
+
+ *axi_clk = devm_clk_get(&pdev->dev, "s_axi_lite_aclk");
+ if (IS_ERR(*axi_clk)) {
+ err = PTR_ERR(*axi_clk);
+ dev_err(&pdev->dev, "failed to get axi_aclk (%u)\n", err);
+ return err;
+ }
+
+ *tx_clk = devm_clk_get(&pdev->dev, "m_axi_mm2s_aclk");
+ if (IS_ERR(*tx_clk))
+ *tx_clk = NULL;
+
+ *txs_clk = devm_clk_get(&pdev->dev, "m_axis_mm2s_aclk");
+ if (IS_ERR(*txs_clk))
+ *txs_clk = NULL;
+
+ *rx_clk = devm_clk_get(&pdev->dev, "m_axi_s2mm_aclk");
+ if (IS_ERR(*rx_clk))
+ *rx_clk = NULL;
+
+ *rxs_clk = devm_clk_get(&pdev->dev, "s_axis_s2mm_aclk");
+ if (IS_ERR(*rxs_clk))
+ *rxs_clk = NULL;
+
+ err = clk_prepare_enable(*axi_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable axi_clk (%u)\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(*tx_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
+ goto err_disable_axiclk;
+ }
+
+ err = clk_prepare_enable(*txs_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable txs_clk (%u)\n", err);
+ goto err_disable_txclk;
+ }
+
+ err = clk_prepare_enable(*rx_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable rx_clk (%u)\n", err);
+ goto err_disable_txsclk;
+ }
+
+ err = clk_prepare_enable(*rxs_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable rxs_clk (%u)\n", err);
+ goto err_disable_rxclk;
+ }
+
+ return 0;
+
+err_disable_rxclk:
+ clk_disable_unprepare(*rx_clk);
+err_disable_txsclk:
+ clk_disable_unprepare(*txs_clk);
+err_disable_txclk:
+ clk_disable_unprepare(*tx_clk);
+err_disable_axiclk:
+ clk_disable_unprepare(*axi_clk);
+
+ return err;
+}
+
+static void xdma_disable_allclks(struct xilinx_dma_device *xdev)
+{
+ clk_disable_unprepare(xdev->rxs_clk);
+ clk_disable_unprepare(xdev->rx_clk);
+ clk_disable_unprepare(xdev->txs_clk);
+ clk_disable_unprepare(xdev->tx_clk);
+ clk_disable_unprepare(xdev->axi_clk);
+}
+
/**
- * xilinx_vdma_chan_probe - Per Channel Probing
+ * xilinx_dma_chan_probe - Per Channel Probing
* It get channel features from the device tree entry and
* initialize special channel handling routines
*
@@ -1123,10 +1971,10 @@ static void xilinx_vdma_chan_remove(struct xilinx_vdma_chan *chan)
*
* Return: '0' on success and failure value on error
*/
-static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev,
+static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
struct device_node *node)
{
- struct xilinx_vdma_chan *chan;
+ struct xilinx_dma_chan *chan;
bool has_dre = false;
u32 value, width;
int err;
@@ -1140,6 +1988,7 @@ static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev,
chan->xdev = xdev;
chan->has_sg = xdev->has_sg;
chan->desc_pendingcount = 0x0;
+ chan->ext_addr = xdev->ext_addr;
spin_lock_init(&chan->lock);
INIT_LIST_HEAD(&chan->pending_list);
@@ -1169,23 +2018,27 @@ static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev,
chan->direction = DMA_MEM_TO_DEV;
chan->id = 0;
- chan->ctrl_offset = XILINX_VDMA_MM2S_CTRL_OFFSET;
- chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;
+ chan->ctrl_offset = XILINX_DMA_MM2S_CTRL_OFFSET;
+ if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
+ chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET;
- if (xdev->flush_on_fsync == XILINX_VDMA_FLUSH_BOTH ||
- xdev->flush_on_fsync == XILINX_VDMA_FLUSH_MM2S)
- chan->flush_on_fsync = true;
+ if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
+ xdev->flush_on_fsync == XILINX_DMA_FLUSH_MM2S)
+ chan->flush_on_fsync = true;
+ }
} else if (of_device_is_compatible(node,
"xlnx,axi-vdma-s2mm-channel")) {
chan->direction = DMA_DEV_TO_MEM;
chan->id = 1;
- chan->ctrl_offset = XILINX_VDMA_S2MM_CTRL_OFFSET;
- chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;
+ chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET;
+ if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
+ chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET;
- if (xdev->flush_on_fsync == XILINX_VDMA_FLUSH_BOTH ||
- xdev->flush_on_fsync == XILINX_VDMA_FLUSH_S2MM)
- chan->flush_on_fsync = true;
+ if (xdev->flush_on_fsync == XILINX_DMA_FLUSH_BOTH ||
+ xdev->flush_on_fsync == XILINX_DMA_FLUSH_S2MM)
+ chan->flush_on_fsync = true;
+ }
} else {
dev_err(xdev->dev, "Invalid channel compatible node\n");
return -EINVAL;
@@ -1193,15 +2046,22 @@ static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev,
/* Request the interrupt */
chan->irq = irq_of_parse_and_map(node, 0);
- err = request_irq(chan->irq, xilinx_vdma_irq_handler, IRQF_SHARED,
- "xilinx-vdma-controller", chan);
+ err = request_irq(chan->irq, xilinx_dma_irq_handler, IRQF_SHARED,
+ "xilinx-dma-controller", chan);
if (err) {
dev_err(xdev->dev, "unable to request IRQ %d\n", chan->irq);
return err;
}
+ if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
+ chan->start_transfer = xilinx_dma_start_transfer;
+ else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA)
+ chan->start_transfer = xilinx_cdma_start_transfer;
+ else
+ chan->start_transfer = xilinx_vdma_start_transfer;
+
/* Initialize the tasklet */
- tasklet_init(&chan->tasklet, xilinx_vdma_do_tasklet,
+ tasklet_init(&chan->tasklet, xilinx_dma_do_tasklet,
(unsigned long)chan);
/*
@@ -1214,7 +2074,7 @@ static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev,
xdev->chan[chan->id] = chan;
/* Reset the channel */
- err = xilinx_vdma_chan_reset(chan);
+ err = xilinx_dma_chan_reset(chan);
if (err < 0) {
dev_err(xdev->dev, "Reset channel failed\n");
return err;
@@ -1233,28 +2093,54 @@ static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev,
static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
- struct xilinx_vdma_device *xdev = ofdma->of_dma_data;
+ struct xilinx_dma_device *xdev = ofdma->of_dma_data;
int chan_id = dma_spec->args[0];
- if (chan_id >= XILINX_VDMA_MAX_CHANS_PER_DEVICE || !xdev->chan[chan_id])
+ if (chan_id >= XILINX_DMA_MAX_CHANS_PER_DEVICE || !xdev->chan[chan_id])
return NULL;
return dma_get_slave_channel(&xdev->chan[chan_id]->common);
}
+static const struct xilinx_dma_config axidma_config = {
+ .dmatype = XDMA_TYPE_AXIDMA,
+ .clk_init = axidma_clk_init,
+};
+
+static const struct xilinx_dma_config axicdma_config = {
+ .dmatype = XDMA_TYPE_CDMA,
+ .clk_init = axicdma_clk_init,
+};
+
+static const struct xilinx_dma_config axivdma_config = {
+ .dmatype = XDMA_TYPE_VDMA,
+ .clk_init = axivdma_clk_init,
+};
+
+static const struct of_device_id xilinx_dma_of_ids[] = {
+ { .compatible = "xlnx,axi-dma-1.00.a", .data = &axidma_config },
+ { .compatible = "xlnx,axi-cdma-1.00.a", .data = &axicdma_config },
+ { .compatible = "xlnx,axi-vdma-1.00.a", .data = &axivdma_config },
+ {}
+};
+MODULE_DEVICE_TABLE(of, xilinx_dma_of_ids);
+
/**
- * xilinx_vdma_probe - Driver probe function
+ * xilinx_dma_probe - Driver probe function
* @pdev: Pointer to the platform_device structure
*
* Return: '0' on success and failure value on error
*/
-static int xilinx_vdma_probe(struct platform_device *pdev)
+static int xilinx_dma_probe(struct platform_device *pdev)
{
+ int (*clk_init)(struct platform_device *, struct clk **, struct clk **,
+ struct clk **, struct clk **, struct clk **)
+ = axivdma_clk_init;
struct device_node *node = pdev->dev.of_node;
- struct xilinx_vdma_device *xdev;
- struct device_node *child;
+ struct xilinx_dma_device *xdev;
+ struct device_node *child, *np = pdev->dev.of_node;
struct resource *io;
- u32 num_frames;
+ u32 num_frames, addr_width;
int i, err;
/* Allocate and initialize the DMA engine structure */
@@ -1263,6 +2149,20 @@ static int xilinx_vdma_probe(struct platform_device *pdev)
return -ENOMEM;
xdev->dev = &pdev->dev;
+ if (np) {
+ const struct of_device_id *match;
+
+ match = of_match_node(xilinx_dma_of_ids, np);
+ if (match && match->data) {
+ xdev->dma_config = match->data;
+ clk_init = xdev->dma_config->clk_init;
+ }
+ }
+
+ err = clk_init(pdev, &xdev->axi_clk, &xdev->tx_clk, &xdev->txs_clk,
+ &xdev->rx_clk, &xdev->rxs_clk);
+ if (err)
+ return err;
/* Request and map I/O memory */
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1273,46 +2173,77 @@ static int xilinx_vdma_probe(struct platform_device *pdev)
/* Retrieve the DMA engine properties from the device tree */
xdev->has_sg = of_property_read_bool(node, "xlnx,include-sg");
- err = of_property_read_u32(node, "xlnx,num-fstores", &num_frames);
- if (err < 0) {
- dev_err(xdev->dev, "missing xlnx,num-fstores property\n");
- return err;
+ if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
+ err = of_property_read_u32(node, "xlnx,num-fstores",
+ &num_frames);
+ if (err < 0) {
+ dev_err(xdev->dev,
+ "missing xlnx,num-fstores property\n");
+ return err;
+ }
+
+ err = of_property_read_u32(node, "xlnx,flush-fsync",
+ &xdev->flush_on_fsync);
+ if (err < 0)
+ dev_warn(xdev->dev,
+ "missing xlnx,flush-fsync property\n");
}
- err = of_property_read_u32(node, "xlnx,flush-fsync",
- &xdev->flush_on_fsync);
+ err = of_property_read_u32(node, "xlnx,addrwidth", &addr_width);
if (err < 0)
- dev_warn(xdev->dev, "missing xlnx,flush-fsync property\n");
+ dev_warn(xdev->dev, "missing xlnx,addrwidth property\n");
+
+ if (addr_width > 32)
+ xdev->ext_addr = true;
+ else
+ xdev->ext_addr = false;
+
+ /* Set the dma mask bits */
+ dma_set_mask(xdev->dev, DMA_BIT_MASK(addr_width));
/* Initialize the DMA engine */
xdev->common.dev = &pdev->dev;
INIT_LIST_HEAD(&xdev->common.channels);
- dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
- dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
+ if (!(xdev->dma_config->dmatype == XDMA_TYPE_CDMA)) {
+ dma_cap_set(DMA_SLAVE, xdev->common.cap_mask);
+ dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
+ }
xdev->common.device_alloc_chan_resources =
- xilinx_vdma_alloc_chan_resources;
+ xilinx_dma_alloc_chan_resources;
xdev->common.device_free_chan_resources =
- xilinx_vdma_free_chan_resources;
- xdev->common.device_prep_interleaved_dma =
+ xilinx_dma_free_chan_resources;
+ xdev->common.device_terminate_all = xilinx_dma_terminate_all;
+ xdev->common.device_tx_status = xilinx_dma_tx_status;
+ xdev->common.device_issue_pending = xilinx_dma_issue_pending;
+ if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA) {
+ xdev->common.device_prep_slave_sg = xilinx_dma_prep_slave_sg;
+ /* Residue calculation is supported by only AXI DMA */
+ xdev->common.residue_granularity =
+ DMA_RESIDUE_GRANULARITY_SEGMENT;
+ } else if (xdev->dma_config->dmatype == XDMA_TYPE_CDMA) {
+ dma_cap_set(DMA_MEMCPY, xdev->common.cap_mask);
+ xdev->common.device_prep_dma_memcpy = xilinx_cdma_prep_memcpy;
+ } else {
+ xdev->common.device_prep_interleaved_dma =
xilinx_vdma_dma_prep_interleaved;
- xdev->common.device_terminate_all = xilinx_vdma_terminate_all;
- xdev->common.device_tx_status = xilinx_vdma_tx_status;
- xdev->common.device_issue_pending = xilinx_vdma_issue_pending;
+ }
platform_set_drvdata(pdev, xdev);
/* Initialize the channels */
for_each_child_of_node(node, child) {
- err = xilinx_vdma_chan_probe(xdev, child);
+ err = xilinx_dma_chan_probe(xdev, child);
if (err < 0)
- goto error;
+ goto disable_clks;
}
- for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++)
- if (xdev->chan[i])
- xdev->chan[i]->num_frms = num_frames;
+ if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
+ for (i = 0; i < XILINX_DMA_MAX_CHANS_PER_DEVICE; i++)
+ if (xdev->chan[i])
+ xdev->chan[i]->num_frms = num_frames;
+ }
/* Register the DMA engine with the core */
dma_async_device_register(&xdev->common);
@@ -1329,49 +2260,47 @@ static int xilinx_vdma_probe(struct platform_device *pdev)
return 0;
+disable_clks:
+ xdma_disable_allclks(xdev);
error:
- for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++)
+ for (i = 0; i < XILINX_DMA_MAX_CHANS_PER_DEVICE; i++)
if (xdev->chan[i])
- xilinx_vdma_chan_remove(xdev->chan[i]);
+ xilinx_dma_chan_remove(xdev->chan[i]);
return err;
}
/**
- * xilinx_vdma_remove - Driver remove function
+ * xilinx_dma_remove - Driver remove function
* @pdev: Pointer to the platform_device structure
*
* Return: Always '0'
*/
-static int xilinx_vdma_remove(struct platform_device *pdev)
+static int xilinx_dma_remove(struct platform_device *pdev)
{
- struct xilinx_vdma_device *xdev = platform_get_drvdata(pdev);
+ struct xilinx_dma_device *xdev = platform_get_drvdata(pdev);
int i;
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&xdev->common);
- for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++)
+ for (i = 0; i < XILINX_DMA_MAX_CHANS_PER_DEVICE; i++)
if (xdev->chan[i])
- xilinx_vdma_chan_remove(xdev->chan[i]);
+ xilinx_dma_chan_remove(xdev->chan[i]);
+
+ xdma_disable_allclks(xdev);
return 0;
}
-static const struct of_device_id xilinx_vdma_of_ids[] = {
- { .compatible = "xlnx,axi-vdma-1.00.a",},
- {}
-};
-MODULE_DEVICE_TABLE(of, xilinx_vdma_of_ids);
-
static struct platform_driver xilinx_vdma_driver = {
.driver = {
.name = "xilinx-vdma",
- .of_match_table = xilinx_vdma_of_ids,
+ .of_match_table = xilinx_dma_of_ids,
},
- .probe = xilinx_vdma_probe,
- .remove = xilinx_vdma_remove,
+ .probe = xilinx_dma_probe,
+ .remove = xilinx_dma_remove,
};
module_platform_driver(xilinx_vdma_driver);