include/asm-powerpc/dma-mapping.h - fp2-dev/kernel/msm - Gitiles

 /*
  * Copyright (C) 2004 IBM
  *
  * Implements the generic device dma API for powerpc.
  * the pci and vio busses
  */
 #ifndef _ASM_DMA_MAPPING_H
 #define _ASM_DMA_MAPPING_H
 #ifdef __KERNEL__

 #include <linux/types.h>
 #include <linux/cache.h>
 /* need struct page definitions */
 #include <linux/mm.h>
 #include <linux/scatterlist.h>
 #include <asm/io.h>

 #define DMA_ERROR_CODE		(~(dma_addr_t)0x0)

 #ifdef CONFIG_NOT_COHERENT_CACHE
 /*
  * DMA-consistent mapping functions for PowerPCs that don't support
  * cache snooping.  These allocate/free a region of uncached mapped
  * memory space for use with DMA devices.  Alternatively, you could
  * allocate the space "normally" and use the cache management functions
  * to ensure it is consistent.
  */
 extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
 extern void __dma_free_coherent(size_t size, void *vaddr);
 extern void __dma_sync(void *vaddr, size_t size, int direction);
 extern void __dma_sync_page(struct page *page, unsigned long offset,
 				 size_t size, int direction);

 #else /* ! CONFIG_NOT_COHERENT_CACHE */
 /*
  * Cache coherent cores.
  */

 #define __dma_alloc_coherent(gfp, size, handle)	NULL
 #define __dma_free_coherent(size, addr)		((void)0)
 #define __dma_sync(addr, size, rw)		((void)0)
 #define __dma_sync_page(pg, off, sz, rw)	((void)0)

 #endif /* ! CONFIG_NOT_COHERENT_CACHE */

 #ifdef CONFIG_PPC64
 /*
  * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
  */
 struct dma_mapping_ops {
 	void *		(*alloc_coherent)(struct device *dev, size_t size,
 				dma_addr_t *dma_handle, gfp_t flag);
 	void		(*free_coherent)(struct device *dev, size_t size,
 				void *vaddr, dma_addr_t dma_handle);
 	dma_addr_t	(*map_single)(struct device *dev, void *ptr,
 				size_t size, enum dma_data_direction direction);
 	void		(*unmap_single)(struct device *dev, dma_addr_t dma_addr,
 				size_t size, enum dma_data_direction direction);
 	int		(*map_sg)(struct device *dev, struct scatterlist *sg,
 				int nents, enum dma_data_direction direction);
 	void		(*unmap_sg)(struct device *dev, struct scatterlist *sg,
 				int nents, enum dma_data_direction direction);
 	int		(*dma_supported)(struct device *dev, u64 mask);
 	int		(*set_dma_mask)(struct device *dev, u64 dma_mask);
 };

 static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
 {
 	/* We don't handle the NULL dev case for ISA for now. We could
 	 * do it via an out of line call but it is not needed for now. The
 	 * only ISA DMA device we support is the floppy and we have a hack
 	 * in the floppy driver directly to get a device for us.
 	 */
 	if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
 		return NULL;
 	return dev->archdata.dma_ops;
 }

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

 static inline int dma_supported(struct device *dev, u64 mask)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	if (unlikely(dma_ops == NULL))
 		return 0;
 	if (dma_ops->dma_supported == NULL)
 		return 1;
 	return dma_ops->dma_supported(dev, mask);
 }

 /* We have our own implementation of pci_set_dma_mask() */
 #define HAVE_ARCH_PCI_SET_DMA_MASK

 static inline int dma_set_mask(struct device *dev, u64 dma_mask)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	if (unlikely(dma_ops == NULL))
 		return -EIO;
 	if (dma_ops->set_dma_mask != NULL)
 		return dma_ops->set_dma_mask(dev, dma_mask);
 	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
 		return -EIO;
 	*dev->dma_mask = dma_mask;
 	return 0;
 }

 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 				       dma_addr_t *dma_handle, gfp_t flag)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	BUG_ON(!dma_ops);
 	return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
 }

 static inline void dma_free_coherent(struct device *dev, size_t size,
 				     void *cpu_addr, dma_addr_t dma_handle)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	BUG_ON(!dma_ops);
 	dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
 }

 static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
 					size_t size,
 					enum dma_data_direction direction)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	BUG_ON(!dma_ops);
 	return dma_ops->map_single(dev, cpu_addr, size, direction);
 }

 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 				    size_t size,
 				    enum dma_data_direction direction)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	BUG_ON(!dma_ops);
 	dma_ops->unmap_single(dev, dma_addr, size, direction);
 }

 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 				      unsigned long offset, size_t size,
 				      enum dma_data_direction direction)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	BUG_ON(!dma_ops);
 	return dma_ops->map_single(dev, page_address(page) + offset, size,
 			direction);
 }

 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 				  size_t size,
 				  enum dma_data_direction direction)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	BUG_ON(!dma_ops);
 	dma_ops->unmap_single(dev, dma_address, size, direction);
 }

 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
 			     int nents, enum dma_data_direction direction)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	BUG_ON(!dma_ops);
 	return dma_ops->map_sg(dev, sg, nents, direction);
 }

 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 				int nhwentries,
 				enum dma_data_direction direction)
 {
 	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

 	BUG_ON(!dma_ops);
 	dma_ops->unmap_sg(dev, sg, nhwentries, direction);
 }


 /*
  * Available generic sets of operations
  */
 extern struct dma_mapping_ops dma_iommu_ops;
 extern struct dma_mapping_ops dma_direct_ops;

 #else /* CONFIG_PPC64 */

 #define dma_supported(dev, mask)	(1)

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

 	*dev->dma_mask = dma_mask;

 	return 0;
 }

 static inline void *dma_alloc_coherent(struct device *dev, size_t size,
 				       dma_addr_t * dma_handle,
 				       gfp_t gfp)
 {
 #ifdef CONFIG_NOT_COHERENT_CACHE
 	return __dma_alloc_coherent(size, dma_handle, gfp);
 #else
 	void *ret;
 	/* ignore region specifiers */
 	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);

 	if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
 		gfp |= GFP_DMA;

 	ret = (void *)__get_free_pages(gfp, get_order(size));

 	if (ret != NULL) {
 		memset(ret, 0, size);
 		*dma_handle = virt_to_bus(ret);
 	}

 	return ret;
 #endif
 }

 static inline void
 dma_free_coherent(struct device *dev, size_t size, void *vaddr,
 		  dma_addr_t dma_handle)
 {
 #ifdef CONFIG_NOT_COHERENT_CACHE
 	__dma_free_coherent(size, vaddr);
 #else
 	free_pages((unsigned long)vaddr, get_order(size));
 #endif
 }

 static inline dma_addr_t
 dma_map_single(struct device *dev, void *ptr, size_t size,
 	       enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	__dma_sync(ptr, size, direction);

 	return virt_to_bus(ptr);
 }

 static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
 				    size_t size,
 				    enum dma_data_direction direction)
 {
 	/* We do nothing. */
 }

 static inline dma_addr_t
 dma_map_page(struct device *dev, struct page *page,
 	     unsigned long offset, size_t size,
 	     enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);

 	__dma_sync_page(page, offset, size, direction);

 	return page_to_bus(page) + offset;
 }

 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 				  size_t size,
 				  enum dma_data_direction direction)
 {
 	/* We do nothing. */
 }

 static inline int
 dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
 	   enum dma_data_direction direction)
 {
 	struct scatterlist *sg;
 	int i;

 	BUG_ON(direction == DMA_NONE);

 	for_each_sg(sgl, sg, nents, i) {
 		BUG_ON(!sg_page(sg));
 		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
 		sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
 	}

 	return nents;
 }

 static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 				int nhwentries,
 				enum dma_data_direction direction)
 {
 	/* We don't do anything here. */
 }

 #endif /* CONFIG_PPC64 */

 static inline void dma_sync_single_for_cpu(struct device *dev,
 		dma_addr_t dma_handle, size_t size,
 		enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);
 	__dma_sync(bus_to_virt(dma_handle), size, direction);
 }

 static inline void dma_sync_single_for_device(struct device *dev,
 		dma_addr_t dma_handle, size_t size,
 		enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);
 	__dma_sync(bus_to_virt(dma_handle), size, direction);
 }

 static inline void dma_sync_sg_for_cpu(struct device *dev,
 		struct scatterlist *sgl, int nents,
 		enum dma_data_direction direction)
 {
 	struct scatterlist *sg;
 	int i;

 	BUG_ON(direction == DMA_NONE);

 	for_each_sg(sgl, sg, nents, i)
 		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
 }

 static inline void dma_sync_sg_for_device(struct device *dev,
 		struct scatterlist *sgl, int nents,
 		enum dma_data_direction direction)
 {
 	struct scatterlist *sg;
 	int i;

 	BUG_ON(direction == DMA_NONE);

 	for_each_sg(sgl, sg, nents, i)
 		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
 }

 static inline int dma_mapping_error(dma_addr_t dma_addr)
 {
 #ifdef CONFIG_PPC64
 	return (dma_addr == DMA_ERROR_CODE);
 #else
 	return 0;
 #endif
 }

 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 #ifdef CONFIG_NOT_COHERENT_CACHE
 #define dma_is_consistent(d, h)	(0)
 #else
 #define dma_is_consistent(d, h)	(1)
 #endif

 static inline int dma_get_cache_alignment(void)
 {
 #ifdef CONFIG_PPC64
 	/* no easy way to get cache size on all processors, so return
 	 * the maximum possible, to be safe */
 	return (1 << INTERNODE_CACHE_SHIFT);
 #else
 	/*
 	 * Each processor family will define its own L1_CACHE_SHIFT,
 	 * L1_CACHE_BYTES wraps to this, so this is always safe.
 	 */
 	return L1_CACHE_BYTES;
 #endif
 }

 static inline void dma_sync_single_range_for_cpu(struct device *dev,
 		dma_addr_t dma_handle, unsigned long offset, size_t size,
 		enum dma_data_direction direction)
 {
 	/* just sync everything for now */
 	dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
 }

 static inline void dma_sync_single_range_for_device(struct device *dev,
 		dma_addr_t dma_handle, unsigned long offset, size_t size,
 		enum dma_data_direction direction)
 {
 	/* just sync everything for now */
 	dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
 }

 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 		enum dma_data_direction direction)
 {
 	BUG_ON(direction == DMA_NONE);
 	__dma_sync(vaddr, size, (int)direction);
 }

 #endif /* __KERNEL__ */
 #endif	/* _ASM_DMA_MAPPING_H */
	/*
	* Copyright (C) 2004 IBM
	*
	* Implements the generic device dma API for powerpc.
	* the pci and vio busses
	*/
	#ifndef _ASM_DMA_MAPPING_H
	#define _ASM_DMA_MAPPING_H
	#ifdef __KERNEL__

	#include <linux/types.h>
	#include <linux/cache.h>
	/* need struct page definitions */
	#include <linux/mm.h>
	#include <linux/scatterlist.h>
	#include <asm/io.h>

	#define DMA_ERROR_CODE (~(dma_addr_t)0x0)

	#ifdef CONFIG_NOT_COHERENT_CACHE
	/*
	* DMA-consistent mapping functions for PowerPCs that don't support
	* cache snooping. These allocate/free a region of uncached mapped
	* memory space for use with DMA devices. Alternatively, you could
	* allocate the space "normally" and use the cache management functions
	* to ensure it is consistent.
	*/
	extern void __dma_alloc_coherent(size_t size, dma_addr_t handle, gfp_t gfp);
	extern void __dma_free_coherent(size_t size, void *vaddr);
	extern void __dma_sync(void *vaddr, size_t size, int direction);
	extern void __dma_sync_page(struct page *page, unsigned long offset,
	size_t size, int direction);

	#else /* ! CONFIG_NOT_COHERENT_CACHE */
	/*
	* Cache coherent cores.
	*/

	#define __dma_alloc_coherent(gfp, size, handle) NULL
	#define __dma_free_coherent(size, addr) ((void)0)
	#define __dma_sync(addr, size, rw) ((void)0)
	#define __dma_sync_page(pg, off, sz, rw) ((void)0)

	#endif /* ! CONFIG_NOT_COHERENT_CACHE */

	#ifdef CONFIG_PPC64
	/*
	* DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
	*/
	struct dma_mapping_ops {
	void * (alloc_coherent)(struct device dev, size_t size,
	dma_addr_t *dma_handle, gfp_t flag);
	void (free_coherent)(struct device dev, size_t size,
	void *vaddr, dma_addr_t dma_handle);
	dma_addr_t (map_single)(struct device dev, void *ptr,
	size_t size, enum dma_data_direction direction);
	void (unmap_single)(struct device dev, dma_addr_t dma_addr,
	size_t size, enum dma_data_direction direction);
	int (map_sg)(struct device dev, struct scatterlist *sg,
	int nents, enum dma_data_direction direction);
	void (unmap_sg)(struct device dev, struct scatterlist *sg,
	int nents, enum dma_data_direction direction);
	int (dma_supported)(struct device dev, u64 mask);
	int (set_dma_mask)(struct device dev, u64 dma_mask);
	};

	static inline struct dma_mapping_ops get_dma_ops(struct device dev)
	{
	/* We don't handle the NULL dev case for ISA for now. We could
	* do it via an out of line call but it is not needed for now. The
	* only ISA DMA device we support is the floppy and we have a hack
	* in the floppy driver directly to get a device for us.
	*/
	if (unlikely(dev == NULL \|\| dev->archdata.dma_ops == NULL))
	return NULL;
	return dev->archdata.dma_ops;
	}

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

	static inline int dma_supported(struct device *dev, u64 mask)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	if (unlikely(dma_ops == NULL))
	return 0;
	if (dma_ops->dma_supported == NULL)
	return 1;
	return dma_ops->dma_supported(dev, mask);
	}

	/* We have our own implementation of pci_set_dma_mask() */
	#define HAVE_ARCH_PCI_SET_DMA_MASK

	static inline int dma_set_mask(struct device *dev, u64 dma_mask)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	if (unlikely(dma_ops == NULL))
	return -EIO;
	if (dma_ops->set_dma_mask != NULL)
	return dma_ops->set_dma_mask(dev, dma_mask);
	if (!dev->dma_mask \|\| !dma_supported(dev, dma_mask))
	return -EIO;
	*dev->dma_mask = dma_mask;
	return 0;
	}

	static inline void dma_alloc_coherent(struct device dev, size_t size,
	dma_addr_t *dma_handle, gfp_t flag)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
	}

	static inline void dma_free_coherent(struct device *dev, size_t size,
	void *cpu_addr, dma_addr_t dma_handle)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
	}

	static inline dma_addr_t dma_map_single(struct device dev, void cpu_addr,
	size_t size,
	enum dma_data_direction direction)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	return dma_ops->map_single(dev, cpu_addr, size, direction);
	}

	static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
	size_t size,
	enum dma_data_direction direction)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	dma_ops->unmap_single(dev, dma_addr, size, direction);
	}

	static inline dma_addr_t dma_map_page(struct device dev, struct page page,
	unsigned long offset, size_t size,
	enum dma_data_direction direction)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	return dma_ops->map_single(dev, page_address(page) + offset, size,
	direction);
	}

	static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
	size_t size,
	enum dma_data_direction direction)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	dma_ops->unmap_single(dev, dma_address, size, direction);
	}

	static inline int dma_map_sg(struct device dev, struct scatterlist sg,
	int nents, enum dma_data_direction direction)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	return dma_ops->map_sg(dev, sg, nents, direction);
	}

	static inline void dma_unmap_sg(struct device dev, struct scatterlist sg,
	int nhwentries,
	enum dma_data_direction direction)
	{
	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);

	BUG_ON(!dma_ops);
	dma_ops->unmap_sg(dev, sg, nhwentries, direction);
	}


	/*
	* Available generic sets of operations
	*/
	extern struct dma_mapping_ops dma_iommu_ops;
	extern struct dma_mapping_ops dma_direct_ops;

	#else /* CONFIG_PPC64 */

	#define dma_supported(dev, mask) (1)

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

	*dev->dma_mask = dma_mask;

	return 0;
	}

	static inline void dma_alloc_coherent(struct device dev, size_t size,
	dma_addr_t * dma_handle,
	gfp_t gfp)
	{
	#ifdef CONFIG_NOT_COHERENT_CACHE
	return __dma_alloc_coherent(size, dma_handle, gfp);
	#else
	void *ret;
	/* ignore region specifiers */
	gfp &= ~(__GFP_DMA \| __GFP_HIGHMEM);

	if (dev == NULL \|\| dev->coherent_dma_mask < 0xffffffff)
	gfp \|= GFP_DMA;

	ret = (void *)__get_free_pages(gfp, get_order(size));

	if (ret != NULL) {
	memset(ret, 0, size);
	*dma_handle = virt_to_bus(ret);
	}

	return ret;
	#endif
	}

	static inline void
	dma_free_coherent(struct device dev, size_t size, void vaddr,
	dma_addr_t dma_handle)
	{
	#ifdef CONFIG_NOT_COHERENT_CACHE
	__dma_free_coherent(size, vaddr);
	#else
	free_pages((unsigned long)vaddr, get_order(size));
	#endif
	}

	static inline dma_addr_t
	dma_map_single(struct device dev, void ptr, size_t size,
	enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	__dma_sync(ptr, size, direction);

	return virt_to_bus(ptr);
	}

	static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
	size_t size,
	enum dma_data_direction direction)
	{
	/* We do nothing. */
	}

	static inline dma_addr_t
	dma_map_page(struct device dev, struct page page,
	unsigned long offset, size_t size,
	enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);

	__dma_sync_page(page, offset, size, direction);

	return page_to_bus(page) + offset;
	}

	static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
	size_t size,
	enum dma_data_direction direction)
	{
	/* We do nothing. */
	}

	static inline int
	dma_map_sg(struct device dev, struct scatterlist sgl, int nents,
	enum dma_data_direction direction)
	{
	struct scatterlist *sg;
	int i;

	BUG_ON(direction == DMA_NONE);

	for_each_sg(sgl, sg, nents, i) {
	BUG_ON(!sg_page(sg));
	__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
	sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
	}

	return nents;
	}

	static inline void dma_unmap_sg(struct device dev, struct scatterlist sg,
	int nhwentries,
	enum dma_data_direction direction)
	{
	/* We don't do anything here. */
	}

	#endif /* CONFIG_PPC64 */

	static inline void dma_sync_single_for_cpu(struct device *dev,
	dma_addr_t dma_handle, size_t size,
	enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);
	__dma_sync(bus_to_virt(dma_handle), size, direction);
	}

	static inline void dma_sync_single_for_device(struct device *dev,
	dma_addr_t dma_handle, size_t size,
	enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);
	__dma_sync(bus_to_virt(dma_handle), size, direction);
	}

	static inline void dma_sync_sg_for_cpu(struct device *dev,
	struct scatterlist *sgl, int nents,
	enum dma_data_direction direction)
	{
	struct scatterlist *sg;
	int i;

	BUG_ON(direction == DMA_NONE);

	for_each_sg(sgl, sg, nents, i)
	__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
	}

	static inline void dma_sync_sg_for_device(struct device *dev,
	struct scatterlist *sgl, int nents,
	enum dma_data_direction direction)
	{
	struct scatterlist *sg;
	int i;

	BUG_ON(direction == DMA_NONE);

	for_each_sg(sgl, sg, nents, i)
	__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
	}

	static inline int dma_mapping_error(dma_addr_t dma_addr)
	{
	#ifdef CONFIG_PPC64
	return (dma_addr == DMA_ERROR_CODE);
	#else
	return 0;
	#endif
	}

	#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
	#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
	#ifdef CONFIG_NOT_COHERENT_CACHE
	#define dma_is_consistent(d, h) (0)
	#else
	#define dma_is_consistent(d, h) (1)
	#endif

	static inline int dma_get_cache_alignment(void)
	{
	#ifdef CONFIG_PPC64
	/* no easy way to get cache size on all processors, so return
	* the maximum possible, to be safe */
	return (1 << INTERNODE_CACHE_SHIFT);
	#else
	/*
	* Each processor family will define its own L1_CACHE_SHIFT,
	* L1_CACHE_BYTES wraps to this, so this is always safe.
	*/
	return L1_CACHE_BYTES;
	#endif
	}

	static inline void dma_sync_single_range_for_cpu(struct device *dev,
	dma_addr_t dma_handle, unsigned long offset, size_t size,
	enum dma_data_direction direction)
	{
	/* just sync everything for now */
	dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
	}

	static inline void dma_sync_single_range_for_device(struct device *dev,
	dma_addr_t dma_handle, unsigned long offset, size_t size,
	enum dma_data_direction direction)
	{
	/* just sync everything for now */
	dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
	}

	static inline void dma_cache_sync(struct device dev, void vaddr, size_t size,
	enum dma_data_direction direction)
	{
	BUG_ON(direction == DMA_NONE);
	__dma_sync(vaddr, size, (int)direction);
	}

	#endif /* __KERNEL__ */
	#endif /* _ASM_DMA_MAPPING_H */