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   1 #ifndef _ASM_DMA_MAPPING_H_
   2 #define _ASM_DMA_MAPPING_H_
   3
   4 /*
   5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
   6  * documentation.
   7  */
   8
   9 #include <linux/scatterlist.h>
  10 #include <asm/io.h>
  11 #include <asm/swiotlb.h>
  12
  13 struct dma_mapping_ops {
  14         int             (*mapping_error)(dma_addr_t dma_addr);
  15         void*           (*alloc_coherent)(struct device *dev, size_t size,
  16                                 dma_addr_t *dma_handle, gfp_t gfp);
  17         void            (*free_coherent)(struct device *dev, size_t size,
  18                                 void *vaddr, dma_addr_t dma_handle);
  19         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
  20                                 size_t size, int direction);
  21         /* like map_single, but doesn't check the device mask */
  22         dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
  23                                 size_t size, int direction);
  24         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  25                                 size_t size, int direction);
  26         void            (*sync_single_for_cpu)(struct device *hwdev,
  27                                 dma_addr_t dma_handle, size_t size,
  28                                 int direction);
  29         void            (*sync_single_for_device)(struct device *hwdev,
  30                                 dma_addr_t dma_handle, size_t size,
  31                                 int direction);
  32         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  33                                 dma_addr_t dma_handle, unsigned long offset,
  34                                 size_t size, int direction);
  35         void            (*sync_single_range_for_device)(struct device *hwdev,
  36                                 dma_addr_t dma_handle, unsigned long offset,
  37                                 size_t size, int direction);
  38         void            (*sync_sg_for_cpu)(struct device *hwdev,
  39                                 struct scatterlist *sg, int nelems,
  40                                 int direction);
  41         void            (*sync_sg_for_device)(struct device *hwdev,
  42                                 struct scatterlist *sg, int nelems,
  43                                 int direction);
  44         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  45                                 int nents, int direction);
  46         void            (*unmap_sg)(struct device *hwdev,
  47                                 struct scatterlist *sg, int nents,
  48                                 int direction);
  49         int             (*dma_supported)(struct device *hwdev, u64 mask);
  50         int             is_phys;
  51 };
  52
  53 extern const struct dma_mapping_ops *dma_ops;
  54
  55 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  56 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  57
  58 void *dma_alloc_coherent(struct device *dev, size_t size,
  59                            dma_addr_t *dma_handle, gfp_t flag);
  60
  61 void dma_free_coherent(struct device *dev, size_t size,
  62                          void *vaddr, dma_addr_t dma_handle);
  63
  64
  65 extern int dma_supported(struct device *hwdev, u64 mask);
  66 extern int dma_set_mask(struct device *dev, u64 mask);
  67
  68 #ifdef CONFIG_X86_32
  69 # include "dma-mapping_32.h"
  70 #else
  71 # include "dma-mapping_64.h"
  72 #endif
  73
  74 static inline dma_addr_t
  75 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  76                int direction)
  77 {
  78         BUG_ON(!valid_dma_direction(direction));
  79         return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
  80 }
  81
  82 static inline void
  83 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  84                  int direction)
  85 {
  86         BUG_ON(!valid_dma_direction(direction));
  87         if (dma_ops->unmap_single)
  88                 dma_ops->unmap_single(dev, addr, size, direction);
  89 }
  90
  91 static inline int
  92 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
  93            int nents, int direction)
  94 {
  95         BUG_ON(!valid_dma_direction(direction));
  96         return dma_ops->map_sg(hwdev, sg, nents, direction);
  97 }
  98
  99 static inline void
 100 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 101              int direction)
 102 {
 103         BUG_ON(!valid_dma_direction(direction));
 104         if (dma_ops->unmap_sg)
 105                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
 106 }
 107
 108 static inline void
 109 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 110                         size_t size, int direction)
 111 {
 112         BUG_ON(!valid_dma_direction(direction));
 113         if (dma_ops->sync_single_for_cpu)
 114                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 115                                              direction);
 116         flush_write_buffers();
 117 }
 118
 119 static inline void
 120 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 121                            size_t size, int direction)
 122 {
 123         BUG_ON(!valid_dma_direction(direction));
 124         if (dma_ops->sync_single_for_device)
 125                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 126                                                 direction);
 127         flush_write_buffers();
 128 }
 129
 130 static inline void
 131 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 132                               unsigned long offset, size_t size, int direction)
 133 {
 134         BUG_ON(!valid_dma_direction(direction));
 135         if (dma_ops->sync_single_range_for_cpu)
 136                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 137                                                    size, direction);
 138
 139         flush_write_buffers();
 140 }
 141
 142 static inline void
 143 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 144                                  unsigned long offset, size_t size,
 145                                  int direction)
 146 {
 147         BUG_ON(!valid_dma_direction(direction));
 148         if (dma_ops->sync_single_range_for_device)
 149                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 150                                                       offset, size, direction);
 151
 152         flush_write_buffers();
 153 }
 154
 155 static inline void
 156 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 157                     int nelems, int direction)
 158 {
 159         BUG_ON(!valid_dma_direction(direction));
 160         if (dma_ops->sync_sg_for_cpu)
 161                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 162         flush_write_buffers();
 163 }
 164
 165 static inline void
 166 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 167                        int nelems, int direction)
 168 {
 169         BUG_ON(!valid_dma_direction(direction));
 170         if (dma_ops->sync_sg_for_device)
 171                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 172
 173         flush_write_buffers();
 174 }
 175
 176 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 177                                       size_t offset, size_t size,
 178                                       int direction)
 179 {
 180         BUG_ON(!valid_dma_direction(direction));
 181         return dma_ops->map_single(dev, page_to_phys(page)+offset,
 182                                    size, direction);
 183 }
 184
 185 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 186                                   size_t size, int direction)
 187 {
 188         dma_unmap_single(dev, addr, size, direction);
 189 }
 190
 191 static inline void
 192 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 193         enum dma_data_direction dir)
 194 {
 195         flush_write_buffers();
 196 }
 197 #endif