summaryrefslogtreecommitdiff
path: root/drivers/spi/spi-s3c64xx.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
-rw-r--r--drivers/spi/spi-s3c64xx.c232
1 files changed, 120 insertions, 112 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index dcf7e1006426..972a94c58be3 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -20,10 +20,12 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/workqueue.h>
+#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#include <mach/dma.h>
@@ -126,8 +128,6 @@
#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
-#define SUSPND (1<<0)
-#define SPIBUSY (1<<1)
#define RXBUSY (1<<2)
#define TXBUSY (1<<3)
@@ -142,10 +142,8 @@ struct s3c64xx_spi_dma_data {
* @clk: Pointer to the spi clock.
* @src_clk: Pointer to the clock used to generate SPI signals.
* @master: Pointer to the SPI Protocol master.
- * @workqueue: Work queue for the SPI xfer requests.
* @cntrlr_info: Platform specific data for the controller this driver manages.
* @tgl_spi: Pointer to the last CS left untoggled by the cs_change hint.
- * @work: Work
* @queue: To log SPI xfer requests.
* @lock: Controller specific lock.
* @state: Set of FLAGS to indicate status.
@@ -153,6 +151,7 @@ struct s3c64xx_spi_dma_data {
* @tx_dmach: Controller's DMA channel for Tx.
* @sfr_start: BUS address of SPI controller regs.
* @regs: Pointer to ioremap'ed controller registers.
+ * @irq: interrupt
* @xfer_completion: To indicate completion of xfer task.
* @cur_mode: Stores the active configuration of the controller.
* @cur_bpw: Stores the active bits per word settings.
@@ -164,10 +163,8 @@ struct s3c64xx_spi_driver_data {
struct clk *src_clk;
struct platform_device *pdev;
struct spi_master *master;
- struct workqueue_struct *workqueue;
struct s3c64xx_spi_info *cntrlr_info;
struct spi_device *tgl_spi;
- struct work_struct work;
struct list_head queue;
spinlock_t lock;
unsigned long sfr_start;
@@ -239,7 +236,7 @@ static void s3c64xx_spi_dmacb(void *data)
struct s3c64xx_spi_dma_data *dma = data;
unsigned long flags;
- if (dma->direction == DMA_FROM_DEVICE)
+ if (dma->direction == DMA_DEV_TO_MEM)
sdd = container_of(data,
struct s3c64xx_spi_driver_data, rx_dma);
else
@@ -248,7 +245,7 @@ static void s3c64xx_spi_dmacb(void *data)
spin_lock_irqsave(&sdd->lock, flags);
- if (dma->direction == DMA_FROM_DEVICE) {
+ if (dma->direction == DMA_DEV_TO_MEM) {
sdd->state &= ~RXBUSY;
if (!(sdd->state & TXBUSY))
complete(&sdd->xfer_completion);
@@ -267,7 +264,7 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
struct s3c64xx_spi_driver_data *sdd;
struct samsung_dma_prep_info info;
- if (dma->direction == DMA_FROM_DEVICE)
+ if (dma->direction == DMA_DEV_TO_MEM)
sdd = container_of((void *)dma,
struct s3c64xx_spi_driver_data, rx_dma);
else
@@ -634,9 +631,10 @@ static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
}
}
-static void handle_msg(struct s3c64xx_spi_driver_data *sdd,
- struct spi_message *msg)
+static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
+ struct spi_message *msg)
{
+ struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
struct spi_device *spi = msg->spi;
struct s3c64xx_spi_csinfo *cs = spi->controller_data;
@@ -766,73 +764,33 @@ out:
msg->status = status;
- if (msg->complete)
- msg->complete(msg->context);
+ spi_finalize_current_message(master);
+
+ return 0;
}
-static void s3c64xx_spi_work(struct work_struct *work)
+static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
{
- struct s3c64xx_spi_driver_data *sdd = container_of(work,
- struct s3c64xx_spi_driver_data, work);
- unsigned long flags;
+ struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
/* Acquire DMA channels */
while (!acquire_dma(sdd))
msleep(10);
- spin_lock_irqsave(&sdd->lock, flags);
-
- while (!list_empty(&sdd->queue)
- && !(sdd->state & SUSPND)) {
-
- struct spi_message *msg;
-
- msg = container_of(sdd->queue.next, struct spi_message, queue);
-
- list_del_init(&msg->queue);
-
- /* Set Xfer busy flag */
- sdd->state |= SPIBUSY;
-
- spin_unlock_irqrestore(&sdd->lock, flags);
-
- handle_msg(sdd, msg);
+ pm_runtime_get_sync(&sdd->pdev->dev);
- spin_lock_irqsave(&sdd->lock, flags);
-
- sdd->state &= ~SPIBUSY;
- }
+ return 0;
+}
- spin_unlock_irqrestore(&sdd->lock, flags);
+static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi)
+{
+ struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
/* Free DMA channels */
sdd->ops->release(sdd->rx_dma.ch, &s3c64xx_spi_dma_client);
sdd->ops->release(sdd->tx_dma.ch, &s3c64xx_spi_dma_client);
-}
-static int s3c64xx_spi_transfer(struct spi_device *spi,
- struct spi_message *msg)
-{
- struct s3c64xx_spi_driver_data *sdd;
- unsigned long flags;
-
- sdd = spi_master_get_devdata(spi->master);
-
- spin_lock_irqsave(&sdd->lock, flags);
-
- if (sdd->state & SUSPND) {
- spin_unlock_irqrestore(&sdd->lock, flags);
- return -ESHUTDOWN;
- }
-
- msg->status = -EINPROGRESS;
- msg->actual_length = 0;
-
- list_add_tail(&msg->queue, &sdd->queue);
-
- queue_work(sdd->workqueue, &sdd->work);
-
- spin_unlock_irqrestore(&sdd->lock, flags);
+ pm_runtime_put(&sdd->pdev->dev);
return 0;
}
@@ -872,13 +830,6 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
}
}
- if (sdd->state & SUSPND) {
- spin_unlock_irqrestore(&sdd->lock, flags);
- dev_err(&spi->dev,
- "setup: SPI-%d not active!\n", spi->master->bus_num);
- return -ESHUTDOWN;
- }
-
spin_unlock_irqrestore(&sdd->lock, flags);
if (spi->bits_per_word != 8
@@ -890,6 +841,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
goto setup_exit;
}
+ pm_runtime_get_sync(&sdd->pdev->dev);
+
/* Check if we can provide the requested rate */
if (!sci->clk_from_cmu) {
u32 psr, speed;
@@ -922,6 +875,8 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
err = -EINVAL;
}
+ pm_runtime_put(&sdd->pdev->dev);
+
setup_exit:
/* setup() returns with device de-selected */
@@ -930,6 +885,33 @@ setup_exit:
return err;
}
+static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
+{
+ struct s3c64xx_spi_driver_data *sdd = data;
+ struct spi_master *spi = sdd->master;
+ unsigned int val;
+
+ val = readl(sdd->regs + S3C64XX_SPI_PENDING_CLR);
+
+ val &= S3C64XX_SPI_PND_RX_OVERRUN_CLR |
+ S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
+ S3C64XX_SPI_PND_TX_OVERRUN_CLR |
+ S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
+
+ writel(val, sdd->regs + S3C64XX_SPI_PENDING_CLR);
+
+ if (val & S3C64XX_SPI_PND_RX_OVERRUN_CLR)
+ dev_err(&spi->dev, "RX overrun\n");
+ if (val & S3C64XX_SPI_PND_RX_UNDERRUN_CLR)
+ dev_err(&spi->dev, "RX underrun\n");
+ if (val & S3C64XX_SPI_PND_TX_OVERRUN_CLR)
+ dev_err(&spi->dev, "TX overrun\n");
+ if (val & S3C64XX_SPI_PND_TX_UNDERRUN_CLR)
+ dev_err(&spi->dev, "TX underrun\n");
+
+ return IRQ_HANDLED;
+}
+
static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
{
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
@@ -970,7 +952,7 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
struct s3c64xx_spi_driver_data *sdd;
struct s3c64xx_spi_info *sci;
struct spi_master *master;
- int ret;
+ int ret, irq;
char clk_name[16];
if (pdev->id < 0) {
@@ -1006,6 +988,12 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
return -ENXIO;
}
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq);
+ return irq;
+ }
+
master = spi_alloc_master(&pdev->dev,
sizeof(struct s3c64xx_spi_driver_data));
if (master == NULL) {
@@ -1021,15 +1009,17 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
sdd->pdev = pdev;
sdd->sfr_start = mem_res->start;
sdd->tx_dma.dmach = dmatx_res->start;
- sdd->tx_dma.direction = DMA_TO_DEVICE;
+ sdd->tx_dma.direction = DMA_MEM_TO_DEV;
sdd->rx_dma.dmach = dmarx_res->start;
- sdd->rx_dma.direction = DMA_FROM_DEVICE;
+ sdd->rx_dma.direction = DMA_DEV_TO_MEM;
sdd->cur_bpw = 8;
master->bus_num = pdev->id;
master->setup = s3c64xx_spi_setup;
- master->transfer = s3c64xx_spi_transfer;
+ master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer;
+ master->transfer_one_message = s3c64xx_spi_transfer_one_message;
+ master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
master->num_chipselect = sci->num_cs;
master->dma_alignment = 8;
/* the spi->mode bits understood by this driver: */
@@ -1084,22 +1074,24 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
goto err6;
}
- sdd->workqueue = create_singlethread_workqueue(
- dev_name(master->dev.parent));
- if (sdd->workqueue == NULL) {
- dev_err(&pdev->dev, "Unable to create workqueue\n");
- ret = -ENOMEM;
- goto err7;
- }
-
/* Setup Deufult Mode */
s3c64xx_spi_hwinit(sdd, pdev->id);
spin_lock_init(&sdd->lock);
init_completion(&sdd->xfer_completion);
- INIT_WORK(&sdd->work, s3c64xx_spi_work);
INIT_LIST_HEAD(&sdd->queue);
+ ret = request_irq(irq, s3c64xx_spi_irq, 0, "spi-s3c64xx", sdd);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n",
+ irq, ret);
+ goto err7;
+ }
+
+ writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN |
+ S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
+ sdd->regs + S3C64XX_SPI_INT_EN);
+
if (spi_register_master(master)) {
dev_err(&pdev->dev, "cannot register SPI master\n");
ret = -EBUSY;
@@ -1113,10 +1105,12 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
mem_res->end, mem_res->start,
sdd->rx_dma.dmach, sdd->tx_dma.dmach);
+ pm_runtime_enable(&pdev->dev);
+
return 0;
err8:
- destroy_workqueue(sdd->workqueue);
+ free_irq(irq, sdd);
err7:
clk_disable(sdd->src_clk);
err6:
@@ -1142,18 +1136,14 @@ static int s3c64xx_spi_remove(struct platform_device *pdev)
struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
struct resource *mem_res;
- unsigned long flags;
-
- spin_lock_irqsave(&sdd->lock, flags);
- sdd->state |= SUSPND;
- spin_unlock_irqrestore(&sdd->lock, flags);
- while (sdd->state & SPIBUSY)
- msleep(10);
+ pm_runtime_disable(&pdev->dev);
spi_unregister_master(master);
- destroy_workqueue(sdd->workqueue);
+ writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
+
+ free_irq(platform_get_irq(pdev, 0), sdd);
clk_disable(sdd->src_clk);
clk_put(sdd->src_clk);
@@ -1174,18 +1164,12 @@ static int s3c64xx_spi_remove(struct platform_device *pdev)
}
#ifdef CONFIG_PM
-static int s3c64xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
+static int s3c64xx_spi_suspend(struct device *dev)
{
- struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
+ struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
- unsigned long flags;
-
- spin_lock_irqsave(&sdd->lock, flags);
- sdd->state |= SUSPND;
- spin_unlock_irqrestore(&sdd->lock, flags);
- while (sdd->state & SPIBUSY)
- msleep(10);
+ spi_master_suspend(master);
/* Disable the clock */
clk_disable(sdd->src_clk);
@@ -1196,12 +1180,12 @@ static int s3c64xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
return 0;
}
-static int s3c64xx_spi_resume(struct platform_device *pdev)
+static int s3c64xx_spi_resume(struct device *dev)
{
- struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
+ struct platform_device *pdev = to_platform_device(dev);
+ struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
struct s3c64xx_spi_info *sci = sdd->cntrlr_info;
- unsigned long flags;
sci->cfg_gpio(pdev);
@@ -1211,25 +1195,49 @@ static int s3c64xx_spi_resume(struct platform_device *pdev)
s3c64xx_spi_hwinit(sdd, pdev->id);
- spin_lock_irqsave(&sdd->lock, flags);
- sdd->state &= ~SUSPND;
- spin_unlock_irqrestore(&sdd->lock, flags);
+ spi_master_resume(master);
return 0;
}
-#else
-#define s3c64xx_spi_suspend NULL
-#define s3c64xx_spi_resume NULL
#endif /* CONFIG_PM */
+#ifdef CONFIG_PM_RUNTIME
+static int s3c64xx_spi_runtime_suspend(struct device *dev)
+{
+ struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
+ struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
+
+ clk_disable(sdd->clk);
+ clk_disable(sdd->src_clk);
+
+ return 0;
+}
+
+static int s3c64xx_spi_runtime_resume(struct device *dev)
+{
+ struct spi_master *master = spi_master_get(dev_get_drvdata(dev));
+ struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
+
+ clk_enable(sdd->src_clk);
+ clk_enable(sdd->clk);
+
+ return 0;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+static const struct dev_pm_ops s3c64xx_spi_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume)
+ SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend,
+ s3c64xx_spi_runtime_resume, NULL)
+};
+
static struct platform_driver s3c64xx_spi_driver = {
.driver = {
.name = "s3c64xx-spi",
.owner = THIS_MODULE,
+ .pm = &s3c64xx_spi_pm,
},
.remove = s3c64xx_spi_remove,
- .suspend = s3c64xx_spi_suspend,
- .resume = s3c64xx_spi_resume,
};
MODULE_ALIAS("platform:s3c64xx-spi");