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Commit 8021a4a0 authored by Russell King's avatar Russell King
Browse files

ARM: dma-mapping: define dma_(un)?map_single in terms of dma_(un)?map_page 



Use dma_map_page()/dma_unmap_page() internals to handle dma_map_single()
and dma_unmap_single().

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 17878362

arch/arm/common/dmabounce.c

+0 −28
Original line number Diff line number Diff line
@@ -328,34 +328,6 @@ static inline void unmap_single(struct device *dev, dma_addr_t dma_addr, 
 * substitute the safe buffer for the unsafe one.

 * (basically move the buffer from an unsafe area to a safe one)

 */

dma_addr_t __dma_map_single(struct device *dev, void *ptr, size_t size,

		enum dma_data_direction dir)

{

	dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",

		__func__, ptr, size, dir);



	BUG_ON(!valid_dma_direction(dir));



	return map_single(dev, ptr, size, dir);

}

EXPORT_SYMBOL(__dma_map_single);



/*

 * see if a mapped address was really a "safe" buffer and if so, copy

 * the data from the safe buffer back to the unsafe buffer and free up

 * the safe buffer.  (basically return things back to the way they

 * should be)

 */

void __dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,

		enum dma_data_direction dir)

{

	dev_dbg(dev, "%s(ptr=%p,size=%d,dir=%x)\n",

		__func__, (void *) dma_addr, size, dir);



	unmap_single(dev, dma_addr, size, dir);

}

EXPORT_SYMBOL(__dma_unmap_single);



dma_addr_t __dma_map_page(struct device *dev, struct page *page,

		unsigned long offset, size_t size, enum dma_data_direction dir)

{

arch/arm/include/asm/dma-mapping.h

+9 −22
Original line number Diff line number Diff line
@@ -298,10 +298,6 @@ extern int dma_needs_bounce(struct device*, dma_addr_t, size_t); 
/*

 * The DMA API, implemented by dmabounce.c.  See below for descriptions.

 */

extern dma_addr_t __dma_map_single(struct device *, void *, size_t,

		enum dma_data_direction);

extern void __dma_unmap_single(struct device *, dma_addr_t, size_t,

		enum dma_data_direction);

extern dma_addr_t __dma_map_page(struct device *, struct page *,

		unsigned long, size_t, enum dma_data_direction);

extern void __dma_unmap_page(struct device *, dma_addr_t, size_t,
@@ -328,13 +324,6 @@ static inline int dmabounce_sync_for_device(struct device *d, dma_addr_t addr, 
}





static inline dma_addr_t __dma_map_single(struct device *dev, void *cpu_addr,

		size_t size, enum dma_data_direction dir)

{

	__dma_single_cpu_to_dev(cpu_addr, size, dir);

	return virt_to_dma(dev, cpu_addr);

}



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)

{
@@ -342,12 +331,6 @@ static inline dma_addr_t __dma_map_page(struct device *dev, struct page *page, 
	return pfn_to_dma(dev, page_to_pfn(page)) + offset;

}



static inline void __dma_unmap_single(struct device *dev, dma_addr_t handle,

		size_t size, enum dma_data_direction dir)

{

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

}



static inline void __dma_unmap_page(struct device *dev, dma_addr_t handle,

		size_t size, enum dma_data_direction dir)

{
@@ -373,14 +356,18 @@ static inline void __dma_unmap_page(struct device *dev, dma_addr_t handle, 
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));



	addr = __dma_map_single(dev, cpu_addr, size, dir);

	debug_dma_map_page(dev, virt_to_page(cpu_addr),

			(unsigned long)cpu_addr & ~PAGE_MASK, size,

			dir, addr, true);

	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;

}
@@ -430,7 +417,7 @@ 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_single(dev, handle, size, dir);

	__dma_unmap_page(dev, handle, size, dir);

}



/**