arch/arm/include/asm/dma-mapping.h - kernel/prism - Git at Google

 #ifndef ASMARM_DMA_MAPPING_H
 #define ASMARM_DMA_MAPPING_H

 #ifdef __KERNEL__

 #include <linux/mm_types.h>
 #include <linux/scatterlist.h>

 #include <asm-generic/dma-coherent.h>
 #include <asm/memory.h>

 /*
  * page_to_dma/dma_to_virt/virt_to_dma are architecture private functions
  * used internally by the DMA-mapping API to provide DMA addresses. They
  * must not be used by drivers.
  */
 #ifndef __arch_page_to_dma

 #if !defined(CONFIG_HIGHMEM)
 static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
 {
 	return (dma_addr_t)__virt_to_bus((unsigned long)page_address(page));
 }
 #elif defined(__pfn_to_bus)
 static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
 {
 	return (dma_addr_t)__pfn_to_bus(page_to_pfn(page));
 }
 #else
 #error "this machine class needs to define __arch_page_to_dma to use HIGHMEM"
 #endif

 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 {
 	return (void *)__bus_to_virt(addr);
 }

 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
 {
 	return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
 }
 #else
 static inline dma_addr_t page_to_dma(struct device *dev, struct page *page)
 {
 	return __arch_page_to_dma(dev, page);
 }

 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 {
 	return __arch_dma_to_virt(dev, addr);
 }

 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
 {
 	return __arch_virt_to_dma(dev, addr);
 }
 #endif

 /*
  * DMA-consistent mapping functions.  These allocate/free a region of
  * uncached, unwrite-buffered mapped memory space for use with DMA
  * devices.  This is the "generic" version.  The PCI specific version
  * is in pci.h
  *
  * Note: Drivers should NOT use this function directly, as it will break
  * platforms with CONFIG_DMABOUNCE.
  * Use the driver DMA support - see dma-mapping.h (dma_sync_*)
  */
 extern void dma_cache_maint(const void *kaddr, size_t size, int rw);
 extern void dma_cache_maint_page(struct page *page, unsigned long offset,
 				 size_t size, int rw);

 /*
  * Return whether the given device DMA address mask can be supported
  * properly.  For example, if your device can only drive the low 24-bits
  * during bus mastering, then you would pass 0x00ffffff as the mask
  * to this function.
  *
  * FIXME: This should really be a platform specific issue - we should
  * return false if GFP_DMA allocations may not satisfy the supplied 'mask'.
  */
 static inline int dma_supported(struct device *dev, u64 mask)
 {
 	if (mask < ISA_DMA_THRESHOLD)
 		return 0;
 	return 1;
 }

 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 {
 	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 		return -EIO;

 	*dev->dma_mask = dma_mask;

 	return 0;
 }

 static inline int dma_get_cache_alignment(void)
 {
 	return 32;
 }

 static inline int dma_is_consistent(struct device *dev, dma_addr_t handle)
 {
 	return !!arch_is_coherent();
 }

 /*
  * DMA errors are defined by all-bits-set in the DMA address.
  */
 static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
 	return dma_addr == ~0;
 }

 /*
  * Dummy noncoherent implementation.  We don't provide a dma_cache_sync
  * function so drivers using this API are highlighted with build warnings.
  */
 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 		dma_addr_t *handle, gfp_t gfp)
 {
 	return NULL;
 }

 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 		void *cpu_addr, dma_addr_t handle)
 {
 }

 /**
  * dma_alloc_coherent - allocate consistent memory for DMA
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @size: required memory size
  * @handle: bus-specific DMA address
  *
  * Allocate some uncached, unbuffered memory for a device for
  * performing DMA.  This function allocates pages, and will
  * return the CPU-viewed address, and sets @handle to be the
  * device-viewed address.
  */
 extern void *dma_alloc_coherent(struct device *, size_t, dma_addr_t *, gfp_t);

 /**
  * dma_free_coherent - free memory allocated by dma_alloc_coherent
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @size: size of memory originally requested in dma_alloc_coherent
  * @cpu_addr: CPU-view address returned from dma_alloc_coherent
  * @handle: device-view address returned from dma_alloc_coherent
  *
  * Free (and unmap) a DMA buffer previously allocated by
  * dma_alloc_coherent().
  *
  * References to memory and mappings associated with cpu_addr/handle
  * during and after this call executing are illegal.
  */
 extern void dma_free_coherent(struct device *, size_t, void *, dma_addr_t);

 /**
  * dma_mmap_coherent - map a coherent DMA allocation into user space
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @vma: vm_area_struct describing requested user mapping
  * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
  * @handle: device-view address returned from dma_alloc_coherent
  * @size: size of memory originally requested in dma_alloc_coherent
  *
  * Map a coherent DMA buffer previously allocated by dma_alloc_coherent
  * into user space.  The coherent DMA buffer must not be freed by the
  * driver until the user space mapping has been released.
  */
 int dma_mmap_coherent(struct device *, struct vm_area_struct *,
 		void *, dma_addr_t, size_t);


 /**
  * dma_alloc_writecombine - allocate writecombining memory for DMA
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @size: required memory size
  * @handle: bus-specific DMA address
  *
  * Allocate some uncached, buffered memory for a device for
  * performing DMA.  This function allocates pages, and will
  * return the CPU-viewed address, and sets @handle to be the
  * device-viewed address.
  */
 extern void *dma_alloc_writecombine(struct device *, size_t, dma_addr_t *,
 		gfp_t);

 #define dma_free_writecombine(dev,size,cpu_addr,handle) \
 	dma_free_coherent(dev,size,cpu_addr,handle)

 int dma_mmap_writecombine(struct device *, struct vm_area_struct *,
 		void *, dma_addr_t, size_t);


 #ifdef	CONFIG_MV_SP_I_FTCH_DB_INV
 extern void mv_l2_inv_range(const void *start, const void *end);
 static inline void mv_l2_sync(const void *start, size_t size, int direction)
 {
 	const void *end = start + size;

 	BUG_ON(!virt_addr_valid(start) || !virt_addr_valid(end - 1));

 	switch (direction) {
 	case DMA_FROM_DEVICE:		/*  */
 	case DMA_BIDIRECTIONAL:		/*  */
 		mv_l2_inv_range(start, end);
 		break;
 	case DMA_TO_DEVICE:		/* */
 		break;
 	default:
 		BUG();
 	}
 }
 #endif
 #ifdef CONFIG_DMABOUNCE
 /*
  * For SA-1111, IXP425, and ADI systems  the dma-mapping functions are "magic"
  * and utilize bounce buffers as needed to work around limited DMA windows.
  *
  * On the SA-1111, a bug limits DMA to only certain regions of RAM.
  * On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
  * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
  *
  * The following are helper functions used by the dmabounce subystem
  *
  */

 /**
  * dmabounce_register_dev
  *
  * @dev: valid struct device pointer
  * @small_buf_size: size of buffers to use with small buffer pool
  * @large_buf_size: size of buffers to use with large buffer pool (can be 0)
  *
  * This function should be called by low-level platform code to register
  * a device as requireing DMA buffer bouncing. The function will allocate
  * appropriate DMA pools for the device.
  *
  */
 extern int dmabounce_register_dev(struct device *, unsigned long,
 		unsigned long);

 /**
  * dmabounce_unregister_dev
  *
  * @dev: valid struct device pointer
  *
  * This function should be called by low-level platform code when device
  * that was previously registered with dmabounce_register_dev is removed
  * from the system.
  *
  */
 extern void dmabounce_unregister_dev(struct device *);

 /**
  * dma_needs_bounce
  *
  * @dev: valid struct device pointer
  * @dma_handle: dma_handle of unbounced buffer
  * @size: size of region being mapped
  *
  * Platforms that utilize the dmabounce mechanism must implement
  * this function.
  *
  * The dmabounce routines call this function whenever a dma-mapping
  * is requested to determine whether a given buffer needs to be bounced
  * or not. The function must return 0 if the buffer is OK for
  * DMA access and 1 if the buffer needs to be bounced.
  *
  */
 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 dma_addr_t dma_map_page(struct device *, struct page *,
 		unsigned long, size_t, enum dma_data_direction);
 extern void dma_unmap_single(struct device *, dma_addr_t, size_t,
 		enum dma_data_direction);

 /*
  * Private functions
  */
 int dmabounce_sync_for_cpu(struct device *, dma_addr_t, unsigned long,
 		size_t, enum dma_data_direction);
 int dmabounce_sync_for_device(struct device *, dma_addr_t, unsigned long,
 		size_t, enum dma_data_direction);
 #else
 static inline int dmabounce_sync_for_cpu(struct device *d, dma_addr_t addr,
 	unsigned long offset, size_t size, enum dma_data_direction dir)
 {
 	return 1;
 }

 static inline int dmabounce_sync_for_device(struct device *d, dma_addr_t addr,
 	unsigned long offset, size_t size, enum dma_data_direction dir)
 {
 	return 1;
 }


 /**
  * 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)
 {
 	BUG_ON(!valid_dma_direction(dir));

 	if (!arch_is_coherent() && (size > 0) )
 		dma_cache_maint(cpu_addr, size, dir);

 	return virt_to_dma(dev, cpu_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)
 {
 	BUG_ON(!valid_dma_direction(dir));

 	if (!arch_is_coherent())
 		dma_cache_maint_page(page, offset, size, dir);

 	return page_to_dma(dev, page) + offset;
 }

 /**
  * 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)
 {
 #ifdef CONFIG_MV_SP_I_FTCH_DB_INV
 	mv_l2_sync(phys_to_virt(handle), size, dir);
 #endif
 }
 #endif /* CONFIG_DMABOUNCE */

 /**
  * 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)
 {
 	dma_unmap_single(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)
 {
 	BUG_ON(!valid_dma_direction(dir));

 	dmabounce_sync_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)
 {
 	BUG_ON(!valid_dma_direction(dir));

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

 	if (!arch_is_coherent())
 		dma_cache_maint(dma_to_virt(dev, handle) + offset, 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)
 {
 	dma_sync_single_range_for_cpu(dev, handle, 0, 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)
 {
 	dma_sync_single_range_for_device(dev, handle, 0, 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,
 		enum dma_data_direction);
 extern void dma_sync_sg_for_cpu(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
	#ifndef ASMARM_DMA_MAPPING_H
	#define ASMARM_DMA_MAPPING_H

	#ifdef __KERNEL__

	#include <linux/mm_types.h>
	#include <linux/scatterlist.h>

	#include <asm-generic/dma-coherent.h>
	#include <asm/memory.h>

	/*
	* page_to_dma/dma_to_virt/virt_to_dma are architecture private functions
	* used internally by the DMA-mapping API to provide DMA addresses. They
	* must not be used by drivers.
	*/
	#ifndef __arch_page_to_dma

	#if !defined(CONFIG_HIGHMEM)
	static inline dma_addr_t page_to_dma(struct device dev, struct page page)
	{
	return (dma_addr_t)__virt_to_bus((unsigned long)page_address(page));
	}
	#elif defined(__pfn_to_bus)
	static inline dma_addr_t page_to_dma(struct device dev, struct page page)
	{
	return (dma_addr_t)__pfn_to_bus(page_to_pfn(page));
	}
	#else
	#error "this machine class needs to define __arch_page_to_dma to use HIGHMEM"
	#endif

	static inline void dma_to_virt(struct device dev, dma_addr_t addr)
	{
	return (void *)__bus_to_virt(addr);
	}

	static inline dma_addr_t virt_to_dma(struct device dev, void addr)
	{
	return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
	}
	#else
	static inline dma_addr_t page_to_dma(struct device dev, struct page page)
	{
	return __arch_page_to_dma(dev, page);
	}

	static inline void dma_to_virt(struct device dev, dma_addr_t addr)
	{
	return __arch_dma_to_virt(dev, addr);
	}

	static inline dma_addr_t virt_to_dma(struct device dev, void addr)
	{
	return __arch_virt_to_dma(dev, addr);
	}
	#endif

	/*
	* DMA-consistent mapping functions. These allocate/free a region of
	* uncached, unwrite-buffered mapped memory space for use with DMA
	* devices. This is the "generic" version. The PCI specific version
	* is in pci.h
	*
	* Note: Drivers should NOT use this function directly, as it will break
	* platforms with CONFIG_DMABOUNCE.
	* Use the driver DMA support - see dma-mapping.h (dma_sync_*)
	*/
	extern void dma_cache_maint(const void *kaddr, size_t size, int rw);
	extern void dma_cache_maint_page(struct page *page, unsigned long offset,
	size_t size, int rw);

	/*
	* Return whether the given device DMA address mask can be supported
	* properly. For example, if your device can only drive the low 24-bits
	* during bus mastering, then you would pass 0x00ffffff as the mask
	* to this function.
	*
	* FIXME: This should really be a platform specific issue - we should
	* return false if GFP_DMA allocations may not satisfy the supplied 'mask'.
	*/
	static inline int dma_supported(struct device *dev, u64 mask)
	{
	if (mask < ISA_DMA_THRESHOLD)
	return 0;
	return 1;
	}

	static inline int dma_set_mask(struct device *dev, u64 dma_mask)
	{
	if (!dev->dma_mask \|\| !dma_supported(dev, dma_mask))
	return -EIO;

	*dev->dma_mask = dma_mask;

	return 0;
	}

	static inline int dma_get_cache_alignment(void)
	{
	return 32;
	}

	static inline int dma_is_consistent(struct device *dev, dma_addr_t handle)
	{
	return !!arch_is_coherent();
	}

	/*
	* DMA errors are defined by all-bits-set in the DMA address.
	*/
	static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
	{
	return dma_addr == ~0;
	}

	/*
	* Dummy noncoherent implementation. We don't provide a dma_cache_sync
	* function so drivers using this API are highlighted with build warnings.
	*/
	static inline void dma_alloc_noncoherent(struct device dev, size_t size,
	dma_addr_t *handle, gfp_t gfp)
	{
	return NULL;
	}

	static inline void dma_free_noncoherent(struct device *dev, size_t size,
	void *cpu_addr, dma_addr_t handle)
	{
	}

	/**
	* dma_alloc_coherent - allocate consistent memory for DMA
	* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
	* @size: required memory size
	* @handle: bus-specific DMA address
	*
	* Allocate some uncached, unbuffered memory for a device for
	* performing DMA. This function allocates pages, and will
	* return the CPU-viewed address, and sets @handle to be the
	* device-viewed address.
	*/
	extern void dma_alloc_coherent(struct device , size_t, dma_addr_t *, gfp_t);

	/**
	* dma_free_coherent - free memory allocated by dma_alloc_coherent
	* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
	* @size: size of memory originally requested in dma_alloc_coherent
	* @cpu_addr: CPU-view address returned from dma_alloc_coherent
	* @handle: device-view address returned from dma_alloc_coherent
	*
	* Free (and unmap) a DMA buffer previously allocated by
	* dma_alloc_coherent().
	*
	* References to memory and mappings associated with cpu_addr/handle
	* during and after this call executing are illegal.
	*/
	extern void dma_free_coherent(struct device , size_t, void , dma_addr_t);

	/**
	* dma_mmap_coherent - map a coherent DMA allocation into user space
	* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
	* @vma: vm_area_struct describing requested user mapping
	* @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
	* @handle: device-view address returned from dma_alloc_coherent
	* @size: size of memory originally requested in dma_alloc_coherent
	*
	* Map a coherent DMA buffer previously allocated by dma_alloc_coherent
	* into user space. The coherent DMA buffer must not be freed by the
	* driver until the user space mapping has been released.
	*/
	int dma_mmap_coherent(struct device , struct vm_area_struct ,
	void *, dma_addr_t, size_t);


	/**
	* dma_alloc_writecombine - allocate writecombining memory for DMA
	* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
	* @size: required memory size
	* @handle: bus-specific DMA address
	*
	* Allocate some uncached, buffered memory for a device for
	* performing DMA. This function allocates pages, and will
	* return the CPU-viewed address, and sets @handle to be the
	* device-viewed address.
	*/
	extern void dma_alloc_writecombine(struct device , size_t, dma_addr_t *,
	gfp_t);

	#define dma_free_writecombine(dev,size,cpu_addr,handle) \
	dma_free_coherent(dev,size,cpu_addr,handle)

	int dma_mmap_writecombine(struct device , struct vm_area_struct ,
	void *, dma_addr_t, size_t);


	#ifdef CONFIG_MV_SP_I_FTCH_DB_INV
	extern void mv_l2_inv_range(const void start, const void end);
	static inline void mv_l2_sync(const void *start, size_t size, int direction)
	{
	const void *end = start + size;

	BUG_ON(!virt_addr_valid(start) \|\| !virt_addr_valid(end - 1));

	switch (direction) {
	case DMA_FROM_DEVICE: /* */
	case DMA_BIDIRECTIONAL: /* */
	mv_l2_inv_range(start, end);
	break;
	case DMA_TO_DEVICE: /* */
	break;
	default:
	BUG();
	}
	}
	#endif
	#ifdef CONFIG_DMABOUNCE
	/*
	* For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
	* and utilize bounce buffers as needed to work around limited DMA windows.
	*
	* On the SA-1111, a bug limits DMA to only certain regions of RAM.
	* On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
	* On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
	*
	* The following are helper functions used by the dmabounce subystem
	*
	*/

	/**
	* dmabounce_register_dev
	*
	* @dev: valid struct device pointer
	* @small_buf_size: size of buffers to use with small buffer pool
	* @large_buf_size: size of buffers to use with large buffer pool (can be 0)
	*
	* This function should be called by low-level platform code to register
	* a device as requireing DMA buffer bouncing. The function will allocate
	* appropriate DMA pools for the device.
	*
	*/
	extern int dmabounce_register_dev(struct device *, unsigned long,
	unsigned long);

	/**
	* dmabounce_unregister_dev
	*
	* @dev: valid struct device pointer
	*
	* This function should be called by low-level platform code when device
	* that was previously registered with dmabounce_register_dev is removed
	* from the system.
	*
	*/
	extern void dmabounce_unregister_dev(struct device *);

	/**
	* dma_needs_bounce
	*
	* @dev: valid struct device pointer
	* @dma_handle: dma_handle of unbounced buffer
	* @size: size of region being mapped
	*
	* Platforms that utilize the dmabounce mechanism must implement
	* this function.
	*
	* The dmabounce routines call this function whenever a dma-mapping
	* is requested to determine whether a given buffer needs to be bounced
	* or not. The function must return 0 if the buffer is OK for
	* DMA access and 1 if the buffer needs to be bounced.
	*
	*/
	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 dma_addr_t dma_map_page(struct device , struct page ,
	unsigned long, size_t, enum dma_data_direction);
	extern void dma_unmap_single(struct device *, dma_addr_t, size_t,
	enum dma_data_direction);

	/*
	* Private functions
	*/
	int dmabounce_sync_for_cpu(struct device *, dma_addr_t, unsigned long,
	size_t, enum dma_data_direction);
	int dmabounce_sync_for_device(struct device *, dma_addr_t, unsigned long,
	size_t, enum dma_data_direction);
	#else
	static inline int dmabounce_sync_for_cpu(struct device *d, dma_addr_t addr,
	unsigned long offset, size_t size, enum dma_data_direction dir)
	{
	return 1;
	}

	static inline int dmabounce_sync_for_device(struct device *d, dma_addr_t addr,
	unsigned long offset, size_t size, enum dma_data_direction dir)
	{
	return 1;
	}


	/**
	* 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)
	{
	BUG_ON(!valid_dma_direction(dir));

	if (!arch_is_coherent() && (size > 0) )
	dma_cache_maint(cpu_addr, size, dir);

	return virt_to_dma(dev, cpu_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)
	{
	BUG_ON(!valid_dma_direction(dir));

	if (!arch_is_coherent())
	dma_cache_maint_page(page, offset, size, dir);

	return page_to_dma(dev, page) + offset;
	}

	/**
	* 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)
	{
	#ifdef CONFIG_MV_SP_I_FTCH_DB_INV
	mv_l2_sync(phys_to_virt(handle), size, dir);
	#endif
	}
	#endif /* CONFIG_DMABOUNCE */

	/**
	* 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)
	{
	dma_unmap_single(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)
	{
	BUG_ON(!valid_dma_direction(dir));

	dmabounce_sync_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)
	{
	BUG_ON(!valid_dma_direction(dir));

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

	if (!arch_is_coherent())
	dma_cache_maint(dma_to_virt(dev, handle) + offset, 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)
	{
	dma_sync_single_range_for_cpu(dev, handle, 0, 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)
	{
	dma_sync_single_range_for_device(dev, handle, 0, 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,
	enum dma_data_direction);
	extern void dma_sync_sg_for_cpu(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