Replace the custom OMAP DMA API usage by DMA engine. Feature-wise the
driver has lost the ability to get notified of DMA transfers failure
through the completion handler, as the DMA engine API doesn't expose
that status information.
Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
---
drivers/media/platform/omap3isp/isph3a_aewb.c | 1 -
drivers/media/platform/omap3isp/isph3a_af.c | 1 -
drivers/media/platform/omap3isp/isphist.c | 128 ++++++++++++++++----------
drivers/media/platform/omap3isp/ispstat.c | 2 +-
drivers/media/platform/omap3isp/ispstat.h | 5 +-
5 files changed, 80 insertions(+), 57 deletions(-)
This patch conflicts with Sakari's omap3isp DT series, which should get merged
in v4.1. One of the two will need to be rebased. That shouldn't be a big issue
as the conflict is minor.
I've tested the patch on a Beagleboard-xM with the snapshot application from
omap3-isp-live (git://git.ideasonboard.org/omap3-isp-live.git, histogram
branch). Only histogram capture has been validated, the content of the
histogram hasn't been checked.
diff --git a/drivers/media/platform/omap3isp/isph3a_aewb.c
b/drivers/media/platform/omap3isp/isph3a_aewb.c
index b208c54..ccaf92f 100644
--- a/drivers/media/platform/omap3isp/isph3a_aewb.c
+++ b/drivers/media/platform/omap3isp/isph3a_aewb.c
@@ -297,7 +297,6 @@ int omap3isp_h3a_aewb_init(struct isp_device *isp)
aewb->ops = &h3a_aewb_ops;
aewb->priv = aewb_cfg;
- aewb->dma_ch = -1;
aewb->event_type = V4L2_EVENT_OMAP3ISP_AEWB;
aewb->isp = isp;
diff --git a/drivers/media/platform/omap3isp/isph3a_af.c
b/drivers/media/platform/omap3isp/isph3a_af.c
index 8a83e19..92937f7 100644
--- a/drivers/media/platform/omap3isp/isph3a_af.c
+++ b/drivers/media/platform/omap3isp/isph3a_af.c
@@ -360,7 +360,6 @@ int omap3isp_h3a_af_init(struct isp_device *isp)
af->ops = &h3a_af_ops;
af->priv = af_cfg;
- af->dma_ch = -1;
af->event_type = V4L2_EVENT_OMAP3ISP_AF;
af->isp = isp;
diff --git a/drivers/media/platform/omap3isp/isphist.c
b/drivers/media/platform/omap3isp/isphist.c
index ce822c3..738b946 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 +177,58 @@ 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_base_phys[OMAP3_ISP_IOMEM_HIST]
+ + 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 +285,7 @@ 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 +486,28 @@ 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 +516,8 @@ 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 +528,10 @@ 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);
}
diff --git a/drivers/media/platform/omap3isp/ispstat.c
b/drivers/media/platform/omap3isp/ispstat.c
index a94e834..20434e8 100644
--- a/drivers/media/platform/omap3isp/ispstat.c
+++ b/drivers/media/platform/omap3isp/ispstat.c
@@ -21,7 +21,7 @@
#include "isp.h"
-#define ISP_STAT_USES_DMAENGINE(stat) ((stat)->dma_ch >= 0)
+#define ISP_STAT_USES_DMAENGINE(stat) ((stat)->dma_ch != NULL)
/*
* MAGIC_SIZE must always be the greatest common divisor of
diff --git a/drivers/media/platform/omap3isp/ispstat.h
b/drivers/media/platform/omap3isp/ispstat.h
index b32b296..b79380d 100644
--- a/drivers/media/platform/omap3isp/ispstat.h
+++ b/drivers/media/platform/omap3isp/ispstat.h
@@ -20,7 +20,6 @@
#include <linux/types.h>
#include <linux/omap3isp.h>
-#include <linux/omap-dma.h>
#include <media/v4l2-event.h>
#include "isp.h"
@@ -33,6 +32,7 @@
#define STAT_NO_BUF 1 /* An error has occurred */
#define STAT_BUF_WAITING_DMA 2 /* Histogram only: DMA is running */
+struct dma_chan;
struct ispstat;
struct ispstat_buffer {
@@ -96,7 +96,6 @@ struct ispstat {
u8 inc_config;
atomic_t buf_err;
enum ispstat_state_t state; /* enabling/disabling state */
- struct omap_dma_channel_params dma_config;
struct isp_device *isp;
void *priv; /* pointer to priv config struct */
void *recover_priv; /* pointer to recover priv configuration */
@@ -110,7 +109,7 @@ struct ispstat {
u32 frame_number;
u32 buf_size;
u32 buf_alloc_size;
- int dma_ch;
+ struct dma_chan *dma_ch;
unsigned long event_type;
struct ispstat_buffer *buf;
struct ispstat_buffer *active_buf;
--
Regards,
Laurent Pinchart
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