1#ifndef _ASM_DMA_MAPPING_H
  2#define _ASM_DMA_MAPPING_H
  3
  4#include <linux/device.h>
  5#include <asm/cache.h>
  6#include <asm/cacheflush.h>
  7#include <asm/scatterlist.h>
  8#include <asm/io.h>
  9
 10/*
 11 * See Documentation/DMA-API.txt for the description of how the
 12 * following DMA API should work.
 13 */
 14
 15#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 16#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 17
 18extern unsigned long __nongprelbss dma_coherent_mem_start;
 19extern unsigned long __nongprelbss dma_coherent_mem_end;
 20
 21void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp);
 22void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle);
 23
 24extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
 25				 enum dma_data_direction direction);
 26
 27static inline
 28void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 29		      enum dma_data_direction direction)
 30{
 31	BUG_ON(direction == DMA_NONE);
 32}
 33
 34extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 35		      enum dma_data_direction direction);
 36
 37static inline
 38void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 39	     enum dma_data_direction direction)
 40{
 41	BUG_ON(direction == DMA_NONE);
 42}
 43
 44extern
 45dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
 46			size_t size, enum dma_data_direction direction);
 47
 48static inline
 49void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 50		    enum dma_data_direction direction)
 51{
 52	BUG_ON(direction == DMA_NONE);
 53}
 54
 55
 56static inline
 57void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
 58			     enum dma_data_direction direction)
 59{
 60}
 61
 62static inline
 63void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
 64				enum dma_data_direction direction)
 65{
 66	flush_write_buffers();
 67}
 68
 69static inline
 70void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 71				   unsigned long offset, size_t size,
 72				   enum dma_data_direction direction)
 73{
 74}
 75
 76static inline
 77void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 78				      unsigned long offset, size_t size,
 79				      enum dma_data_direction direction)
 80{
 81	flush_write_buffers();
 82}
 83
 84static inline
 85void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
 86			 enum dma_data_direction direction)
 87{
 88}
 89
 90static inline
 91void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
 92			    enum dma_data_direction direction)
 93{
 94	flush_write_buffers();
 95}
 96
 97static inline
 98int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 99{
100	return 0;
101}
102
103static inline
104int dma_supported(struct device *dev, u64 mask)
105{
106        /*
107         * we fall back to GFP_DMA when the mask isn't all 1s,
108         * so we can't guarantee allocations that must be
109         * within a tighter range than GFP_DMA..
110         */
111        if (mask < 0x00ffffff)
112                return 0;
113
114	return 1;
115}
116
117static inline
118int dma_set_mask(struct device *dev, u64 mask)
119{
120	if (!dev->dma_mask || !dma_supported(dev, mask))
121		return -EIO;
122
123	*dev->dma_mask = mask;
124
125	return 0;
126}
127
128static inline
129void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
130		    enum dma_data_direction direction)
131{
132	flush_write_buffers();
133}
134
135#endif  /* _ASM_DMA_MAPPING_H */