Skip to content

Commit

Permalink
ARM: dma-mapping: use asm-generic/dma-mapping-common.h
Browse files Browse the repository at this point in the history 
This patch modifies dma-mapping implementation on ARM architecture to
use common dma_map_ops structure and asm-generic/dma-mapping-common.h
helpers.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Tested-By: Subash Patel <subash.ramaswamy@linaro.org>
  • Loading branch information
Marek Szyprowski committed May 21, 2012
1 parent a227fb9 commit 2dc6a01
Show file tree
Hide file tree
Showing 4 changed files with 115 additions and 231 deletions.
1 change: 1 addition & 0 deletions arch/arm/Kconfig
View file
Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ config ARM
select HAVE_AOUT
select HAVE_DMA_API_DEBUG
select HAVE_IDE if PCI || ISA || PCMCIA
select HAVE_DMA_ATTRS
select HAVE_MEMBLOCK
select RTC_LIB
select SYS_SUPPORTS_APM_EMULATION
Expand Down
1 change: 1 addition & 0 deletions arch/arm/include/asm/device.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
#define ASMARM_DEVICE_H

struct dev_archdata {
struct dma_map_ops *dma_ops;
#ifdef CONFIG_DMABOUNCE
struct dmabounce_device_info *dmabounce;
#endif
Expand Down
196 changes: 27 additions & 169 deletions arch/arm/include/asm/dma-mapping.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,27 @@
#include <asm/memory.h>

#define DMA_ERROR_CODE (~0)
extern struct dma_map_ops arm_dma_ops;

static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
if (dev && dev->archdata.dma_ops)
return dev->archdata.dma_ops;
return &arm_dma_ops;
}

static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
{
BUG_ON(!dev);
dev->archdata.dma_ops = ops;
}

#include <asm-generic/dma-mapping-common.h>

static inline int dma_set_mask(struct device *dev, u64 mask)
{
return get_dma_ops(dev)->set_dma_mask(dev, mask);
}

#ifdef __arch_page_to_dma
#error Please update to __arch_pfn_to_dma
Expand Down Expand Up @@ -119,7 +140,6 @@ static inline void __dma_page_dev_to_cpu(struct page *page, unsigned long off,

extern int dma_supported(struct device *, u64);
extern int dma_set_mask(struct device *, u64);

/*
* DMA errors are defined by all-bits-set in the DMA address.
*/
Expand Down Expand Up @@ -297,179 +317,17 @@ static inline void __dma_unmap_page(struct device *dev, dma_addr_t handle,
}
#endif /* CONFIG_DMABOUNCE */

/**
* dma_map_single - map a single buffer for streaming DMA
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @cpu_addr: CPU direct mapped address of buffer
* @size: size of buffer to map
* @dir: DMA transfer direction
*
* Ensure that any data held in the cache is appropriately discarded
* or written back.
*
* The device owns this memory once this call has completed. The CPU
* can regain ownership by calling dma_unmap_single() or
* dma_sync_single_for_cpu().
*/
static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
size_t size, enum dma_data_direction dir)
{
unsigned long offset;
struct page *page;
dma_addr_t addr;

BUG_ON(!virt_addr_valid(cpu_addr));
BUG_ON(!virt_addr_valid(cpu_addr + size - 1));
BUG_ON(!valid_dma_direction(dir));

page = virt_to_page(cpu_addr);
offset = (unsigned long)cpu_addr & ~PAGE_MASK;
addr = __dma_map_page(dev, page, offset, size, dir);
debug_dma_map_page(dev, page, offset, size, dir, addr, true);

return addr;
}

/**
* dma_map_page - map a portion of a page for streaming DMA
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @page: page that buffer resides in
* @offset: offset into page for start of buffer
* @size: size of buffer to map
* @dir: DMA transfer direction
*
* Ensure that any data held in the cache is appropriately discarded
* or written back.
*
* The device owns this memory once this call has completed. The CPU
* can regain ownership by calling dma_unmap_page().
*/
static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir)
{
dma_addr_t addr;

BUG_ON(!valid_dma_direction(dir));

addr = __dma_map_page(dev, page, offset, size, dir);
debug_dma_map_page(dev, page, offset, size, dir, addr, false);

return addr;
}

/**
* dma_unmap_single - unmap a single buffer previously mapped
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @handle: DMA address of buffer
* @size: size of buffer (same as passed to dma_map_single)
* @dir: DMA transfer direction (same as passed to dma_map_single)
*
* Unmap a single streaming mode DMA translation. The handle and size
* must match what was provided in the previous dma_map_single() call.
* All other usages are undefined.
*
* After this call, reads by the CPU to the buffer are guaranteed to see
* whatever the device wrote there.
*/
static inline void dma_unmap_single(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
debug_dma_unmap_page(dev, handle, size, dir, true);
__dma_unmap_page(dev, handle, size, dir);
}

/**
* dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @handle: DMA address of buffer
* @size: size of buffer (same as passed to dma_map_page)
* @dir: DMA transfer direction (same as passed to dma_map_page)
*
* Unmap a page streaming mode DMA translation. The handle and size
* must match what was provided in the previous dma_map_page() call.
* All other usages are undefined.
*
* After this call, reads by the CPU to the buffer are guaranteed to see
* whatever the device wrote there.
*/
static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
debug_dma_unmap_page(dev, handle, size, dir, false);
__dma_unmap_page(dev, handle, size, dir);
}


static inline void dma_sync_single_for_cpu(struct device *dev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
BUG_ON(!valid_dma_direction(dir));

debug_dma_sync_single_for_cpu(dev, handle, size, dir);

if (!dmabounce_sync_for_cpu(dev, handle, size, dir))
return;

__dma_single_dev_to_cpu(dma_to_virt(dev, handle), size, dir);
}

static inline void dma_sync_single_for_device(struct device *dev,
dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
BUG_ON(!valid_dma_direction(dir));

debug_dma_sync_single_for_device(dev, handle, size, dir);

if (!dmabounce_sync_for_device(dev, handle, size, dir))
return;

__dma_single_cpu_to_dev(dma_to_virt(dev, handle), size, dir);
}

/**
* dma_sync_single_range_for_cpu
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @handle: DMA address of buffer
* @offset: offset of region to start sync
* @size: size of region to sync
* @dir: DMA transfer direction (same as passed to dma_map_single)
*
* Make physical memory consistent for a single streaming mode DMA
* translation after a transfer.
*
* If you perform a dma_map_single() but wish to interrogate the
* buffer using the cpu, yet do not wish to teardown the PCI dma
* mapping, you must call this function before doing so. At the
* next point you give the PCI dma address back to the card, you
* must first the perform a dma_sync_for_device, and then the
* device again owns the buffer.
*/
static inline void dma_sync_single_range_for_cpu(struct device *dev,
dma_addr_t handle, unsigned long offset, size_t size,
enum dma_data_direction dir)
{
dma_sync_single_for_cpu(dev, handle + offset, size, dir);
}

static inline void dma_sync_single_range_for_device(struct device *dev,
dma_addr_t handle, unsigned long offset, size_t size,
enum dma_data_direction dir)
{
dma_sync_single_for_device(dev, handle + offset, size, dir);
}

/*
* The scatter list versions of the above methods.
*/
extern int dma_map_sg(struct device *, struct scatterlist *, int,
enum dma_data_direction);
extern void dma_unmap_sg(struct device *, struct scatterlist *, int,
extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
enum dma_data_direction, struct dma_attrs *attrs);
extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
enum dma_data_direction, struct dma_attrs *attrs);
extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
enum dma_data_direction);
extern void dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
enum dma_data_direction);
extern void dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
enum dma_data_direction);


#endif /* __KERNEL__ */
#endif
Loading

0 comments on commit 2dc6a01

Please sign in to comment.