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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 11:18:42 -0300
commit2a0a5472af5caa0d0df334abb9975dc496f045da (patch)
treee6981f7cc0127340febff0021f398b7300345c47
parent9a8c7fffa2293417d0245fb9f618564d7dee04a6 (diff)
[media] omap3isp: Use the ARM DMA IOMMU-aware operations
Attach an ARM DMA I/O virtual address space to the ISP device. This switches to the IOMMU-aware ARM DMA backend, we can thus remove the explicit calls to the OMAP IOMMU map and unmap functions. 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/Kconfig4
-rw-r--r--drivers/media/platform/omap3isp/isp.c102
-rw-r--r--drivers/media/platform/omap3isp/isp.h8
-rw-r--r--drivers/media/platform/omap3isp/ispqueue.c34
-rw-r--r--drivers/media/platform/omap3isp/ispqueue.h2
5 files changed, 89 insertions, 61 deletions
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 20f1655e6d75..8108c698b548 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -93,7 +93,9 @@ config VIDEO_M32R_AR_M64278
config VIDEO_OMAP3
tristate "OMAP 3 Camera support"
- depends on OMAP_IOVMM && VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API && ARCH_OMAP3
+ depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API && ARCH_OMAP3
+ select ARM_DMA_USE_IOMMU
+ select OMAP_IOMMU
---help---
Driver for an OMAP 3 camera controller.
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 06a0df434249..5a4801b76282 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -69,6 +69,8 @@
#include <linux/sched.h>
#include <linux/vmalloc.h>
+#include <asm/dma-iommu.h>
+
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
@@ -1625,7 +1627,7 @@ struct isp_device *omap3isp_get(struct isp_device *isp)
* Decrement the reference count on the ISP. If the last reference is released,
* power-down all submodules, disable clocks and free temporary buffers.
*/
-void omap3isp_put(struct isp_device *isp)
+static void __omap3isp_put(struct isp_device *isp, bool save_ctx)
{
if (isp == NULL)
return;
@@ -1634,7 +1636,7 @@ void omap3isp_put(struct isp_device *isp)
BUG_ON(isp->ref_count == 0);
if (--isp->ref_count == 0) {
isp_disable_interrupts(isp);
- if (isp->domain) {
+ if (save_ctx) {
isp_save_ctx(isp);
isp->has_context = 1;
}
@@ -1648,6 +1650,11 @@ void omap3isp_put(struct isp_device *isp)
mutex_unlock(&isp->isp_mutex);
}
+void omap3isp_put(struct isp_device *isp)
+{
+ __omap3isp_put(isp, true);
+}
+
/* --------------------------------------------------------------------------
* Platform device driver
*/
@@ -2120,6 +2127,61 @@ error_csiphy:
return ret;
}
+static void isp_detach_iommu(struct isp_device *isp)
+{
+ arm_iommu_release_mapping(isp->mapping);
+ isp->mapping = NULL;
+ iommu_group_remove_device(isp->dev);
+}
+
+static int isp_attach_iommu(struct isp_device *isp)
+{
+ struct dma_iommu_mapping *mapping;
+ struct iommu_group *group;
+ int ret;
+
+ /* Create a device group and add the device to it. */
+ group = iommu_group_alloc();
+ if (IS_ERR(group)) {
+ dev_err(isp->dev, "failed to allocate IOMMU group\n");
+ return PTR_ERR(group);
+ }
+
+ ret = iommu_group_add_device(group, isp->dev);
+ iommu_group_put(group);
+
+ if (ret < 0) {
+ dev_err(isp->dev, "failed to add device to IPMMU group\n");
+ return ret;
+ }
+
+ /*
+ * Create the ARM mapping, used by the ARM DMA mapping core to allocate
+ * VAs. This will allocate a corresponding IOMMU domain.
+ */
+ mapping = arm_iommu_create_mapping(&platform_bus_type, SZ_1G, SZ_2G);
+ if (IS_ERR(mapping)) {
+ dev_err(isp->dev, "failed to create ARM IOMMU mapping\n");
+ ret = PTR_ERR(mapping);
+ goto error;
+ }
+
+ isp->mapping = mapping;
+
+ /* Attach the ARM VA mapping to the device. */
+ ret = arm_iommu_attach_device(isp->dev, mapping);
+ if (ret < 0) {
+ dev_err(isp->dev, "failed to attach device to VA mapping\n");
+ goto error;
+ }
+
+ return 0;
+
+error:
+ isp_detach_iommu(isp);
+ return ret;
+}
+
/*
* isp_remove - Remove ISP platform device
* @pdev: Pointer to ISP platform device
@@ -2135,10 +2197,8 @@ static int isp_remove(struct platform_device *pdev)
isp_xclk_cleanup(isp);
__omap3isp_get(isp, false);
- iommu_detach_device(isp->domain, &pdev->dev);
- iommu_domain_free(isp->domain);
- isp->domain = NULL;
- omap3isp_put(isp);
+ isp_detach_iommu(isp);
+ __omap3isp_put(isp, false);
return 0;
}
@@ -2265,39 +2325,32 @@ static int isp_probe(struct platform_device *pdev)
}
}
- isp->domain = iommu_domain_alloc(pdev->dev.bus);
- if (!isp->domain) {
- dev_err(isp->dev, "can't alloc iommu domain\n");
- ret = -ENOMEM;
+ /* IOMMU */
+ ret = isp_attach_iommu(isp);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "unable to attach to IOMMU\n");
goto error_isp;
}
- ret = iommu_attach_device(isp->domain, &pdev->dev);
- if (ret) {
- dev_err(&pdev->dev, "can't attach iommu device: %d\n", ret);
- ret = -EPROBE_DEFER;
- goto free_domain;
- }
-
/* Interrupt */
isp->irq_num = platform_get_irq(pdev, 0);
if (isp->irq_num <= 0) {
dev_err(isp->dev, "No IRQ resource\n");
ret = -ENODEV;
- goto detach_dev;
+ goto error_iommu;
}
if (devm_request_irq(isp->dev, isp->irq_num, isp_isr, IRQF_SHARED,
"OMAP3 ISP", isp)) {
dev_err(isp->dev, "Unable to request IRQ\n");
ret = -EINVAL;
- goto detach_dev;
+ goto error_iommu;
}
/* Entities */
ret = isp_initialize_modules(isp);
if (ret < 0)
- goto detach_dev;
+ goto error_iommu;
ret = isp_register_entities(isp);
if (ret < 0)
@@ -2310,14 +2363,11 @@ static int isp_probe(struct platform_device *pdev)
error_modules:
isp_cleanup_modules(isp);
-detach_dev:
- iommu_detach_device(isp->domain, &pdev->dev);
-free_domain:
- iommu_domain_free(isp->domain);
- isp->domain = NULL;
+error_iommu:
+ isp_detach_iommu(isp);
error_isp:
isp_xclk_cleanup(isp);
- omap3isp_put(isp);
+ __omap3isp_put(isp, false);
error:
mutex_destroy(&isp->isp_mutex);
diff --git a/drivers/media/platform/omap3isp/isp.h b/drivers/media/platform/omap3isp/isp.h
index 6d5e69711907..2c314eea1252 100644
--- a/drivers/media/platform/omap3isp/isp.h
+++ b/drivers/media/platform/omap3isp/isp.h
@@ -45,8 +45,6 @@
#include "ispcsi2.h"
#include "ispccp2.h"
-#define IOMMU_FLAG (IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_8)
-
#define ISP_TOK_TERM 0xFFFFFFFF /*
* terminating token for ISP
* modules reg list
@@ -152,6 +150,7 @@ struct isp_xclk {
* regions.
* @mmio_base_phys: Array with physical L4 bus addresses for ISP register
* regions.
+ * @mapping: IOMMU mapping
* @stat_lock: Spinlock for handling statistics
* @isp_mutex: Mutex for serializing requests to ISP.
* @stop_failure: Indicates that an entity failed to stop.
@@ -171,7 +170,6 @@ struct isp_xclk {
* @isp_res: Pointer to current settings for ISP Resizer.
* @isp_prev: Pointer to current settings for ISP Preview.
* @isp_ccdc: Pointer to current settings for ISP CCDC.
- * @iommu: Pointer to requested IOMMU instance for ISP.
* @platform_cb: ISP driver callback function pointers for platform code
*
* This structure is used to store the OMAP ISP Information.
@@ -189,6 +187,8 @@ struct isp_device {
void __iomem *mmio_base[OMAP3_ISP_IOMEM_LAST];
unsigned long mmio_base_phys[OMAP3_ISP_IOMEM_LAST];
+ struct dma_iommu_mapping *mapping;
+
/* ISP Obj */
spinlock_t stat_lock; /* common lock for statistic drivers */
struct mutex isp_mutex; /* For handling ref_count field */
@@ -219,8 +219,6 @@ struct isp_device {
unsigned int sbl_resources;
unsigned int subclk_resources;
-
- struct iommu_domain *domain;
};
#define v4l2_dev_to_isp_device(dev) \
diff --git a/drivers/media/platform/omap3isp/ispqueue.c b/drivers/media/platform/omap3isp/ispqueue.c
index cee1b5d29cfa..9c90fb081404 100644
--- a/drivers/media/platform/omap3isp/ispqueue.c
+++ b/drivers/media/platform/omap3isp/ispqueue.c
@@ -26,7 +26,6 @@
#include <asm/cacheflush.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
-#include <linux/omap-iommu.h>
#include <linux/pagemap.h>
#include <linux/poll.h>
#include <linux/scatterlist.h>
@@ -159,7 +158,7 @@ static int isp_video_buffer_prepare_kernel(struct isp_video_buffer *buf)
struct isp_video *video = vfh->video;
return dma_get_sgtable(video->isp->dev, &buf->sgt, buf->vaddr,
- buf->paddr, PAGE_ALIGN(buf->vbuf.length));
+ buf->dma, PAGE_ALIGN(buf->vbuf.length));
}
/*
@@ -170,18 +169,10 @@ static int isp_video_buffer_prepare_kernel(struct isp_video_buffer *buf)
*/
static void isp_video_buffer_cleanup(struct isp_video_buffer *buf)
{
- struct isp_video_fh *vfh = isp_video_queue_to_isp_video_fh(buf->queue);
- struct isp_video *video = vfh->video;
enum dma_data_direction direction;
DEFINE_DMA_ATTRS(attrs);
unsigned int i;
- if (buf->dma) {
- omap_iommu_vunmap(video->isp->domain, video->isp->dev,
- buf->dma);
- buf->dma = 0;
- }
-
if (buf->vbuf.memory == V4L2_MEMORY_USERPTR) {
if (buf->skip_cache)
dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
@@ -419,11 +410,8 @@ done:
*/
static int isp_video_buffer_prepare(struct isp_video_buffer *buf)
{
- struct isp_video_fh *vfh = isp_video_queue_to_isp_video_fh(buf->queue);
- struct isp_video *video = vfh->video;
enum dma_data_direction direction;
DEFINE_DMA_ATTRS(attrs);
- unsigned long addr;
int ret;
switch (buf->vbuf.memory) {
@@ -458,23 +446,15 @@ static int isp_video_buffer_prepare(struct isp_video_buffer *buf)
goto done;
}
+ buf->dma = sg_dma_address(buf->sgt.sgl);
break;
default:
return -EINVAL;
}
- addr = omap_iommu_vmap(video->isp->domain, video->isp->dev, 0,
- &buf->sgt, IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_8);
- if (IS_ERR_VALUE(addr)) {
- ret = -EIO;
- goto done;
- }
-
- buf->dma = addr;
-
- if (!IS_ALIGNED(addr, 32)) {
- dev_dbg(video->isp->dev,
+ if (!IS_ALIGNED(buf->dma, 32)) {
+ dev_dbg(buf->queue->dev,
"Buffer address must be aligned to 32 bytes boundary.\n");
ret = -EINVAL;
goto done;
@@ -576,7 +556,7 @@ static int isp_video_queue_free(struct isp_video_queue *queue)
if (buf->vaddr) {
dma_free_coherent(queue->dev,
PAGE_ALIGN(buf->vbuf.length),
- buf->vaddr, buf->paddr);
+ buf->vaddr, buf->dma);
buf->vaddr = NULL;
}
@@ -632,7 +612,7 @@ static int isp_video_queue_alloc(struct isp_video_queue *queue,
buf->vbuf.m.offset = i * PAGE_ALIGN(size);
buf->vaddr = mem;
- buf->paddr = dma;
+ buf->dma = dma;
}
buf->vbuf.index = i;
@@ -1079,7 +1059,7 @@ int omap3isp_video_queue_mmap(struct isp_video_queue *queue,
*/
vma->vm_pgoff = 0;
- ret = dma_mmap_coherent(queue->dev, vma, buf->vaddr, buf->paddr, size);
+ ret = dma_mmap_coherent(queue->dev, vma, buf->vaddr, buf->dma, size);
if (ret < 0)
goto done;
diff --git a/drivers/media/platform/omap3isp/ispqueue.h b/drivers/media/platform/omap3isp/ispqueue.h
index d580f581c209..ae4acb9ab5f9 100644
--- a/drivers/media/platform/omap3isp/ispqueue.h
+++ b/drivers/media/platform/omap3isp/ispqueue.h
@@ -68,7 +68,6 @@ enum isp_video_buffer_state {
* @prepared: Whether the buffer has been prepared
* @skip_cache: Whether to skip cache management operations for this buffer
* @vaddr: Memory virtual address (for kernel buffers)
- * @paddr: Memory physicall address (for kernel buffers)
* @vm_flags: Buffer VMA flags (for userspace buffers)
* @npages: Number of pages (for userspace buffers)
* @pages: Pages table (for userspace non-VM_PFNMAP buffers)
@@ -87,7 +86,6 @@ struct isp_video_buffer {
/* For kernel buffers. */
void *vaddr;
- dma_addr_t paddr;
/* For userspace buffers. */
vm_flags_t vm_flags;

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