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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2014-01-02 20:06:08 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-05-25 11:10:50 -0300
commit0e24e90f2ca72f7e68e41f3e99fc2838909c36e9 (patch)
treefc999a3a38feadb02fa6ecbb4afed1ee78cbdfa7
parent84ac0f09aee6c534a86ba8e2598f5e022772f0eb (diff)
[media] omap3isp: stat: Use the DMA API
Replace the OMAP-specific IOMMU API usage by the DMA API. All buffers are now allocated using dma_alloc_coherent() and the related sg table is retrieved using dma_get_sgtable() for sync operations. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
-rw-r--r--drivers/media/platform/omap3isp/ispstat.c123
-rw-r--r--drivers/media/platform/omap3isp/ispstat.h2
2 files changed, 53 insertions, 72 deletions
diff --git a/drivers/media/platform/omap3isp/ispstat.c b/drivers/media/platform/omap3isp/ispstat.c
index 4cf7eb1866cd..e6cbc1eaf4ca 100644
--- a/drivers/media/platform/omap3isp/ispstat.c
+++ b/drivers/media/platform/omap3isp/ispstat.c
@@ -26,7 +26,6 @@
*/
#include <linux/dma-mapping.h>
-#include <linux/omap-iommu.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
@@ -77,21 +76,10 @@ static void __isp_stat_buf_sync_magic(struct ispstat *stat,
dma_addr_t, unsigned long, size_t,
enum dma_data_direction))
{
- struct device *dev = stat->isp->dev;
- struct page *pg;
- dma_addr_t dma_addr;
- u32 offset;
-
- /* Initial magic words */
- pg = vmalloc_to_page(buf->virt_addr);
- dma_addr = pfn_to_dma(dev, page_to_pfn(pg));
- dma_sync(dev, dma_addr, 0, MAGIC_SIZE, dir);
-
- /* Final magic words */
- pg = vmalloc_to_page(buf->virt_addr + buf_size);
- dma_addr = pfn_to_dma(dev, page_to_pfn(pg));
- offset = ((u32)buf->virt_addr + buf_size) & ~PAGE_MASK;
- dma_sync(dev, dma_addr, offset, MAGIC_SIZE, dir);
+ /* Sync the initial and final magic words. */
+ dma_sync(stat->isp->dev, buf->dma_addr, 0, MAGIC_SIZE, dir);
+ dma_sync(stat->isp->dev, buf->dma_addr + (buf_size & PAGE_MASK),
+ buf_size & ~PAGE_MASK, MAGIC_SIZE, dir);
}
static void isp_stat_buf_sync_magic_for_device(struct ispstat *stat,
@@ -183,8 +171,8 @@ static void isp_stat_buf_sync_for_device(struct ispstat *stat,
if (ISP_STAT_USES_DMAENGINE(stat))
return;
- dma_sync_sg_for_device(stat->isp->dev, buf->sgt->sgl,
- buf->sgt->nents, DMA_FROM_DEVICE);
+ dma_sync_sg_for_device(stat->isp->dev, buf->sgt.sgl,
+ buf->sgt.nents, DMA_FROM_DEVICE);
}
static void isp_stat_buf_sync_for_cpu(struct ispstat *stat,
@@ -193,8 +181,8 @@ static void isp_stat_buf_sync_for_cpu(struct ispstat *stat,
if (ISP_STAT_USES_DMAENGINE(stat))
return;
- dma_sync_sg_for_cpu(stat->isp->dev, buf->sgt->sgl,
- buf->sgt->nents, DMA_FROM_DEVICE);
+ dma_sync_sg_for_cpu(stat->isp->dev, buf->sgt.sgl,
+ buf->sgt.nents, DMA_FROM_DEVICE);
}
static void isp_stat_buf_clear(struct ispstat *stat)
@@ -354,26 +342,21 @@ static struct ispstat_buffer *isp_stat_buf_get(struct ispstat *stat,
static void isp_stat_bufs_free(struct ispstat *stat)
{
- struct isp_device *isp = stat->isp;
- int i;
+ struct device *dev = ISP_STAT_USES_DMAENGINE(stat)
+ ? NULL : stat->isp->dev;
+ unsigned int i;
for (i = 0; i < STAT_MAX_BUFS; i++) {
struct ispstat_buffer *buf = &stat->buf[i];
- if (!ISP_STAT_USES_DMAENGINE(stat)) {
- if (IS_ERR_OR_NULL((void *)buf->dma_addr))
- continue;
- if (buf->sgt)
- dma_unmap_sg(isp->dev, buf->sgt->sgl,
- buf->sgt->nents, DMA_FROM_DEVICE);
- omap_iommu_vfree(isp->domain, isp->dev, buf->dma_addr);
- } else {
- if (!buf->virt_addr)
- continue;
- dma_free_coherent(stat->isp->dev, stat->buf_alloc_size,
- buf->virt_addr, buf->dma_addr);
- }
- buf->sgt = NULL;
+ if (!buf->virt_addr)
+ continue;
+
+ sg_free_table(&buf->sgt);
+
+ dma_free_coherent(dev, stat->buf_alloc_size, buf->virt_addr,
+ buf->dma_addr);
+
buf->dma_addr = 0;
buf->virt_addr = NULL;
buf->empty = 1;
@@ -386,47 +369,49 @@ static void isp_stat_bufs_free(struct ispstat *stat)
stat->active_buf = NULL;
}
-static int isp_stat_bufs_alloc_iommu(struct ispstat *stat,
- struct ispstat_buffer *buf,
- unsigned int size)
-{
- struct isp_device *isp = stat->isp;
- struct iovm_struct *iovm;
-
- buf->dma_addr = omap_iommu_vmalloc(isp->domain, isp->dev, 0,
- size, IOMMU_FLAG);
- if (IS_ERR_VALUE(buf->dma_addr))
- return -ENOMEM;
-
- iovm = omap_find_iovm_area(isp->dev, buf->dma_addr);
- if (!iovm)
- return -ENOMEM;
-
- if (!dma_map_sg(isp->dev, iovm->sgt->sgl, iovm->sgt->nents,
- DMA_FROM_DEVICE))
- return -ENOMEM;
-
- buf->sgt = iovm->sgt;
- buf->virt_addr = omap_da_to_va(stat->isp->dev, buf->dma_addr);
-
- return 0;
-}
-
-static int isp_stat_bufs_alloc_dma(struct ispstat *stat,
+static int isp_stat_bufs_alloc_one(struct device *dev,
struct ispstat_buffer *buf,
unsigned int size)
{
- buf->virt_addr = dma_alloc_coherent(stat->isp->dev, size,
- &buf->dma_addr, GFP_KERNEL | GFP_DMA);
+ int ret;
- if (!buf->virt_addr || !buf->dma_addr)
+ buf->virt_addr = dma_alloc_coherent(dev, size, &buf->dma_addr,
+ GFP_KERNEL | GFP_DMA);
+ if (!buf->virt_addr)
return -ENOMEM;
+ ret = dma_get_sgtable(dev, &buf->sgt, buf->virt_addr, buf->dma_addr,
+ size);
+ if (ret < 0) {
+ dma_free_coherent(dev, size, buf->virt_addr, buf->dma_addr);
+ buf->virt_addr = NULL;
+ buf->dma_addr = 0;
+ return ret;
+ }
+
return 0;
}
+/*
+ * The device passed to the DMA API depends on whether the statistics block uses
+ * ISP DMA, external DMA or PIO to transfer data.
+ *
+ * The first case (for the AEWB and AF engines) passes the ISP device, resulting
+ * in the DMA buffers being mapped through the ISP IOMMU.
+ *
+ * The second case (for the histogram engine) should pass the DMA engine device.
+ * As that device isn't accessible through the OMAP DMA engine API the driver
+ * passes NULL instead, resulting in the buffers being mapped directly as
+ * physical pages.
+ *
+ * The third case (for the histogram engine) doesn't require any mapping. The
+ * buffers could be allocated with kmalloc/vmalloc, but we still use
+ * dma_alloc_coherent() for consistency purpose.
+ */
static int isp_stat_bufs_alloc(struct ispstat *stat, u32 size)
{
+ struct device *dev = ISP_STAT_USES_DMAENGINE(stat)
+ ? NULL : stat->isp->dev;
unsigned long flags;
unsigned int i;
@@ -458,11 +443,7 @@ static int isp_stat_bufs_alloc(struct ispstat *stat, u32 size)
struct ispstat_buffer *buf = &stat->buf[i];
int ret;
- if (ISP_STAT_USES_DMAENGINE(stat))
- ret = isp_stat_bufs_alloc_dma(stat, buf, size);
- else
- ret = isp_stat_bufs_alloc_iommu(stat, buf, size);
-
+ ret = isp_stat_bufs_alloc_one(dev, buf, size);
if (ret < 0) {
dev_err(stat->isp->dev,
"%s: Failed to allocate DMA buffer %u\n",
diff --git a/drivers/media/platform/omap3isp/ispstat.h b/drivers/media/platform/omap3isp/ispstat.h
index 857f45edc755..58d6ac7cb664 100644
--- a/drivers/media/platform/omap3isp/ispstat.h
+++ b/drivers/media/platform/omap3isp/ispstat.h
@@ -46,7 +46,7 @@
struct ispstat;
struct ispstat_buffer {
- const struct sg_table *sgt;
+ struct sg_table sgt;
void *virt_addr;
dma_addr_t dma_addr;
struct timespec ts;

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