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   1 #ifndef _X8664_DMA_MAPPING_H
   2 #define _X8664_DMA_MAPPING_H 1
   3
   4 /*
   5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
   6  * documentation.
   7  */
   8
   9
  10 #include <asm/scatterlist.h>
  11 #include <asm/io.h>
  12 #include <asm/swiotlb.h>
  13
  14 struct dma_mapping_ops {
  15         int             (*mapping_error)(dma_addr_t dma_addr);
  16         void*           (*alloc_coherent)(struct device *dev, size_t size,
  17                                 dma_addr_t *dma_handle, gfp_t gfp);
  18         void            (*free_coherent)(struct device *dev, size_t size,
  19                                 void *vaddr, dma_addr_t dma_handle);
  20         dma_addr_t      (*map_single)(struct device *hwdev, void *ptr,
  21                                 size_t size, int direction);
  22         /* like map_single, but doesn't check the device mask */
  23         dma_addr_t      (*map_simple)(struct device *hwdev, char *ptr,
  24                                 size_t size, int direction);
  25         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  26                                 size_t size, int direction);
  27         void            (*sync_single_for_cpu)(struct device *hwdev,
  28                                 dma_addr_t dma_handle, size_t size,
  29                                 int direction);
  30         void            (*sync_single_for_device)(struct device *hwdev,
  31                                 dma_addr_t dma_handle, size_t size,
  32                                 int direction);
  33         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  34                                 dma_addr_t dma_handle, unsigned long offset,
  35                                 size_t size, int direction);
  36         void            (*sync_single_range_for_device)(struct device *hwdev,
  37                                 dma_addr_t dma_handle, unsigned long offset,
  38                                 size_t size, int direction);
  39         void            (*sync_sg_for_cpu)(struct device *hwdev,
  40                                 struct scatterlist *sg, int nelems,
  41                                 int direction);
  42         void            (*sync_sg_for_device)(struct device *hwdev,
  43                                 struct scatterlist *sg, int nelems,
  44                                 int direction);
  45         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  46                                 int nents, int direction);
  47         void            (*unmap_sg)(struct device *hwdev,
  48                                 struct scatterlist *sg, int nents,
  49                                 int direction);
  50         int             (*dma_supported)(struct device *hwdev, u64 mask);
  51         int             is_phys;
  52 };
  53
  54 extern dma_addr_t bad_dma_address;
  55 extern struct dma_mapping_ops* dma_ops;
  56 extern int iommu_merge;
  57
  58 static inline int dma_mapping_error(dma_addr_t dma_addr)
  59 {
  60         if (dma_ops->mapping_error)
  61                 return dma_ops->mapping_error(dma_addr);
  62
  63         return (dma_addr == bad_dma_address);
  64 }
  65
  66 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  67 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  68
  69 extern void *dma_alloc_coherent(struct device *dev, size_t size,
  70                                 dma_addr_t *dma_handle, gfp_t gfp);
  71 extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  72                               dma_addr_t dma_handle);
  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, 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         dma_ops->unmap_single(dev, addr, size, direction);
  88 }
  89
  90 #define dma_map_page(dev,page,offset,size,dir) \
  91         dma_map_single((dev), page_address(page)+(offset), (size), (dir))
  92
  93 #define dma_unmap_page dma_unmap_single
  94
  95 static inline void
  96 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
  97                         size_t size, int direction)
  98 {
  99         BUG_ON(!valid_dma_direction(direction));
 100         if (dma_ops->sync_single_for_cpu)
 101                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 102                                              direction);
 103         flush_write_buffers();
 104 }
 105
 106 static inline void
 107 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 108                            size_t size, int direction)
 109 {
 110         BUG_ON(!valid_dma_direction(direction));
 111         if (dma_ops->sync_single_for_device)
 112                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 113                                                 direction);
 114         flush_write_buffers();
 115 }
 116
 117 static inline void
 118 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 119                               unsigned long offset, size_t size, int direction)
 120 {
 121         BUG_ON(!valid_dma_direction(direction));
 122         if (dma_ops->sync_single_range_for_cpu) {
 123                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
 124         }
 125
 126         flush_write_buffers();
 127 }
 128
 129 static inline void
 130 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 131                                  unsigned long offset, size_t size, int direction)
 132 {
 133         BUG_ON(!valid_dma_direction(direction));
 134         if (dma_ops->sync_single_range_for_device)
 135                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 136                                                       offset, size, direction);
 137
 138         flush_write_buffers();
 139 }
 140
 141 static inline void
 142 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 143                     int nelems, int direction)
 144 {
 145         BUG_ON(!valid_dma_direction(direction));
 146         if (dma_ops->sync_sg_for_cpu)
 147                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 148         flush_write_buffers();
 149 }
 150
 151 static inline void
 152 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 153                        int nelems, int direction)
 154 {
 155         BUG_ON(!valid_dma_direction(direction));
 156         if (dma_ops->sync_sg_for_device) {
 157                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 158         }
 159
 160         flush_write_buffers();
 161 }
 162
 163 static inline int
 164 dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
 165 {
 166         BUG_ON(!valid_dma_direction(direction));
 167         return dma_ops->map_sg(hwdev, sg, nents, direction);
 168 }
 169
 170 static inline void
 171 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 172              int direction)
 173 {
 174         BUG_ON(!valid_dma_direction(direction));
 175         dma_ops->unmap_sg(hwdev, sg, nents, direction);
 176 }
 177
 178 extern int dma_supported(struct device *hwdev, u64 mask);
 179
 180 /* same for gart, swiotlb, and nommu */
 181 static inline int dma_get_cache_alignment(void)
 182 {
 183         return boot_cpu_data.x86_clflush_size;
 184 }
 185
 186 #define dma_is_consistent(d, h) 1
 187
 188 extern int dma_set_mask(struct device *dev, u64 mask);
 189
 190 static inline void
 191 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 192         enum dma_data_direction dir)
 193 {
 194         flush_write_buffers();
 195 }
 196
 197 extern struct device fallback_dev;
 198 extern int panic_on_overflow;
 199
 200 #endif /* _X8664_DMA_MAPPING_H */