LXR linux/arch/frv/include/asm/dma-mapping.h

   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/* Not supported for now */
 136static inline int dma_mmap_coherent(struct device *dev,
 137                                    struct vm_area_struct *vma, void *cpu_addr,
 138                                    dma_addr_t dma_addr, size_t size)
 139{
 140        return -EINVAL;
 141}
 142
 143static inline int dma_get_sgtable(struct device *dev, struct sg_table *sgt,
 144                                  void *cpu_addr, dma_addr_t dma_addr,
 145                                  size_t size)
 146{
 147        return -EINVAL;
 148}
 149
 150#endif  /* _ASM_DMA_MAPPING_H */
 151