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path: root/drivers/media/platform/omap3isp/isphist.c
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Diffstat (limited to 'drivers/media/platform/omap3isp/isphist.c')
-rw-r--r--drivers/media/platform/omap3isp/isphist.c127
1 files changed, 76 insertions, 51 deletions
diff --git a/drivers/media/platform/omap3isp/isphist.c b/drivers/media/platform/omap3isp/isphist.c
index ce822c34c843..7138b043a4aa 100644
--- a/drivers/media/platform/omap3isp/isphist.c
+++ b/drivers/media/platform/omap3isp/isphist.c
@@ -16,20 +16,18 @@
*/
#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/omap-dmaengine.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
-#include <linux/device.h>
#include "isp.h"
#include "ispreg.h"
#include "isphist.h"
-#define OMAP24XX_DMA_NO_DEVICE 0
-
#define HIST_CONFIG_DMA 1
-#define HIST_USING_DMA(hist) ((hist)->dma_ch >= 0)
-
/*
* hist_reset_mem - clear Histogram memory before start stats engine.
*/
@@ -62,20 +60,6 @@ static void hist_reset_mem(struct ispstat *hist)
hist->wait_acc_frames = conf->num_acc_frames;
}
-static void hist_dma_config(struct ispstat *hist)
-{
- struct isp_device *isp = hist->isp;
-
- hist->dma_config.data_type = OMAP_DMA_DATA_TYPE_S32;
- hist->dma_config.sync_mode = OMAP_DMA_SYNC_ELEMENT;
- hist->dma_config.frame_count = 1;
- hist->dma_config.src_amode = OMAP_DMA_AMODE_CONSTANT;
- hist->dma_config.src_start = isp->mmio_base_phys[OMAP3_ISP_IOMEM_HIST]
- + ISPHIST_DATA;
- hist->dma_config.dst_amode = OMAP_DMA_AMODE_POST_INC;
- hist->dma_config.src_or_dst_synch = OMAP_DMA_SRC_SYNC;
-}
-
/*
* hist_setup_regs - Helper function to update Histogram registers.
*/
@@ -176,17 +160,12 @@ static int hist_busy(struct ispstat *hist)
& ISPHIST_PCR_BUSY;
}
-static void hist_dma_cb(int lch, u16 ch_status, void *data)
+static void hist_dma_cb(void *data)
{
struct ispstat *hist = data;
- if (ch_status & ~OMAP_DMA_BLOCK_IRQ) {
- dev_dbg(hist->isp->dev, "hist: DMA error. status = 0x%04x\n",
- ch_status);
- omap_stop_dma(lch);
- hist_reset_mem(hist);
- atomic_set(&hist->buf_err, 1);
- }
+ /* FIXME: The DMA engine API can't report transfer errors :-/ */
+
isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
ISPHIST_CNT_CLEAR);
@@ -198,24 +177,57 @@ static void hist_dma_cb(int lch, u16 ch_status, void *data)
static int hist_buf_dma(struct ispstat *hist)
{
dma_addr_t dma_addr = hist->active_buf->dma_addr;
+ struct dma_async_tx_descriptor *tx;
+ struct dma_slave_config cfg;
+ dma_cookie_t cookie;
+ int ret;
if (unlikely(!dma_addr)) {
dev_dbg(hist->isp->dev, "hist: invalid DMA buffer address\n");
- hist_reset_mem(hist);
- return STAT_NO_BUF;
+ goto error;
}
isp_reg_writel(hist->isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR);
isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
ISPHIST_CNT_CLEAR);
omap3isp_flush(hist->isp);
- hist->dma_config.dst_start = dma_addr;
- hist->dma_config.elem_count = hist->buf_size / sizeof(u32);
- omap_set_dma_params(hist->dma_ch, &hist->dma_config);
- omap_start_dma(hist->dma_ch);
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.src_addr = hist->isp->mmio_hist_base_phys + ISPHIST_DATA;
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.src_maxburst = hist->buf_size / 4;
+
+ ret = dmaengine_slave_config(hist->dma_ch, &cfg);
+ if (ret < 0) {
+ dev_dbg(hist->isp->dev,
+ "hist: DMA slave configuration failed\n");
+ goto error;
+ }
+
+ tx = dmaengine_prep_slave_single(hist->dma_ch, dma_addr,
+ hist->buf_size, DMA_DEV_TO_MEM,
+ DMA_CTRL_ACK);
+ if (tx == NULL) {
+ dev_dbg(hist->isp->dev,
+ "hist: DMA slave preparation failed\n");
+ goto error;
+ }
+
+ tx->callback = hist_dma_cb;
+ tx->callback_param = hist;
+ cookie = tx->tx_submit(tx);
+ if (dma_submit_error(cookie)) {
+ dev_dbg(hist->isp->dev, "hist: DMA submission failed\n");
+ goto error;
+ }
+
+ dma_async_issue_pending(hist->dma_ch);
return STAT_BUF_WAITING_DMA;
+
+error:
+ hist_reset_mem(hist);
+ return STAT_NO_BUF;
}
static int hist_buf_pio(struct ispstat *hist)
@@ -272,7 +284,7 @@ static int hist_buf_process(struct ispstat *hist)
if (--(hist->wait_acc_frames))
return STAT_NO_BUF;
- if (HIST_USING_DMA(hist))
+ if (hist->dma_ch)
ret = hist_buf_dma(hist);
else
ret = hist_buf_pio(hist);
@@ -473,18 +485,28 @@ int omap3isp_hist_init(struct isp_device *isp)
hist->isp = isp;
- if (HIST_CONFIG_DMA)
- ret = omap_request_dma(OMAP24XX_DMA_NO_DEVICE, "DMA_ISP_HIST",
- hist_dma_cb, hist, &hist->dma_ch);
- if (ret) {
- if (HIST_CONFIG_DMA)
- dev_warn(isp->dev, "hist: DMA request channel failed. "
- "Using PIO only.\n");
- hist->dma_ch = -1;
- } else {
- dev_dbg(isp->dev, "hist: DMA channel = %d\n", hist->dma_ch);
- hist_dma_config(hist);
- omap_enable_dma_irq(hist->dma_ch, OMAP_DMA_BLOCK_IRQ);
+ if (HIST_CONFIG_DMA) {
+ struct platform_device *pdev = to_platform_device(isp->dev);
+ struct resource *res;
+ unsigned int sig = 0;
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
+ "hist");
+ if (res)
+ sig = res->start;
+
+ hist->dma_ch = dma_request_slave_channel_compat(mask,
+ omap_dma_filter_fn, &sig, isp->dev, "hist");
+ if (!hist->dma_ch)
+ dev_warn(isp->dev,
+ "hist: DMA channel request failed, using PIO\n");
+ else
+ dev_dbg(isp->dev, "hist: using DMA channel %s\n",
+ dma_chan_name(hist->dma_ch));
}
hist->ops = &hist_ops;
@@ -493,8 +515,8 @@ int omap3isp_hist_init(struct isp_device *isp)
ret = omap3isp_stat_init(hist, "histogram", &hist_subdev_ops);
if (ret) {
- if (HIST_USING_DMA(hist))
- omap_free_dma(hist->dma_ch);
+ if (hist->dma_ch)
+ dma_release_channel(hist->dma_ch);
}
return ret;
@@ -505,7 +527,10 @@ int omap3isp_hist_init(struct isp_device *isp)
*/
void omap3isp_hist_cleanup(struct isp_device *isp)
{
- if (HIST_USING_DMA(&isp->isp_hist))
- omap_free_dma(isp->isp_hist.dma_ch);
- omap3isp_stat_cleanup(&isp->isp_hist);
+ struct ispstat *hist = &isp->isp_hist;
+
+ if (hist->dma_ch)
+ dma_release_channel(hist->dma_ch);
+
+ omap3isp_stat_cleanup(hist);
}