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  1. #ifndef _ASM_GENERIC_DMA_MAPPING_H
  2. #define _ASM_GENERIC_DMA_MAPPING_H
  3.  
  4. /* define the dma api to allow compilation but not linking of
  5.  * dma dependent code.  Code that depends on the dma-mapping
  6.  * API needs to set 'depends on HAS_DMA' in its Kconfig
  7.  */
  8.  
  9. struct scatterlist;
  10.  
  11. extern void *
  12. dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
  13.                    gfp_t flag);
  14.  
  15. extern void
  16. dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
  17.                     dma_addr_t dma_handle);
  18.  
  19. static inline void *dma_alloc_attrs(struct device *dev, size_t size,
  20.                                     dma_addr_t *dma_handle, gfp_t flag,
  21.                                     struct dma_attrs *attrs)
  22. {
  23.         /* attrs is not supported and ignored */
  24.         return dma_alloc_coherent(dev, size, dma_handle, flag);
  25. }
  26.  
  27. static inline void dma_free_attrs(struct device *dev, size_t size,
  28.                                   void *cpu_addr, dma_addr_t dma_handle,
  29.                                   struct dma_attrs *attrs)
  30. {
  31.         /* attrs is not supported and ignored */
  32.         dma_free_coherent(dev, size, cpu_addr, dma_handle);
  33. }
  34.  
  35. #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  36. #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  37.  
  38. extern dma_addr_t
  39. dma_map_single(struct device *dev, void *ptr, size_t size,
  40.                enum dma_data_direction direction);
  41.  
  42. extern void
  43. dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  44.                  enum dma_data_direction direction);
  45.  
  46. extern int
  47. dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  48.            enum dma_data_direction direction);
  49.  
  50. extern void
  51. dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  52.              enum dma_data_direction direction);
  53.  
  54. extern dma_addr_t
  55. dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  56.              size_t size, enum dma_data_direction direction);
  57.  
  58. extern void
  59. dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  60.                enum dma_data_direction direction);
  61.  
  62. extern void
  63. dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  64.                         enum dma_data_direction direction);
  65.  
  66. extern void
  67. dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  68.                               unsigned long offset, size_t size,
  69.                               enum dma_data_direction direction);
  70.  
  71. extern void
  72. dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
  73.                     enum dma_data_direction direction);
  74.  
  75. #define dma_sync_single_for_device dma_sync_single_for_cpu
  76. #define dma_sync_single_range_for_device dma_sync_single_range_for_cpu
  77. #define dma_sync_sg_for_device dma_sync_sg_for_cpu
  78.  
  79. extern int
  80. dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
  81.  
  82. extern int
  83. dma_supported(struct device *dev, u64 mask);
  84.  
  85. extern int
  86. dma_set_mask(struct device *dev, u64 mask);
  87.  
  88. extern int
  89. dma_get_cache_alignment(void);
  90.  
  91. extern void
  92. dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  93.                enum dma_data_direction direction);
  94.  
  95. #endif /* _ASM_GENERIC_DMA_MAPPING_H */
  96.