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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 const 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 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  70 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  71
  72 extern void *dma_alloc_coherent(struct device *dev, size_t size,
  73                                 dma_addr_t *dma_handle, gfp_t gfp);
  74 extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  75                               dma_addr_t dma_handle);
  76
  77 static inline dma_addr_t
  78 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  79                int direction)
  80 {
  81         BUG_ON(!valid_dma_direction(direction));
  82         return dma_ops->map_single(hwdev, ptr, size, direction);
  83 }
  84
  85 static inline void
  86 dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
  87                  int direction)
  88 {
  89         BUG_ON(!valid_dma_direction(direction));
  90         dma_ops->unmap_single(dev, addr, size, direction);
  91 }
  92
  93 #define dma_map_page(dev,page,offset,size,dir) \
  94         dma_map_single((dev), page_address(page)+(offset), (size), (dir))
  95
  96 #define dma_unmap_page dma_unmap_single
  97
  98 static inline void
  99 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 100                         size_t size, int direction)
 101 {
 102         BUG_ON(!valid_dma_direction(direction));
 103         if (dma_ops->sync_single_for_cpu)
 104                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 105                                              direction);
 106         flush_write_buffers();
 107 }
 108
 109 static inline void
 110 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 111                            size_t size, int direction)
 112 {
 113         BUG_ON(!valid_dma_direction(direction));
 114         if (dma_ops->sync_single_for_device)
 115                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 116                                                 direction);
 117         flush_write_buffers();
 118 }
 119
 120 static inline void
 121 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 122                               unsigned long offset, size_t size, int direction)
 123 {
 124         BUG_ON(!valid_dma_direction(direction));
 125         if (dma_ops->sync_single_range_for_cpu) {
 126                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
 127         }
 128
 129         flush_write_buffers();
 130 }
 131
 132 static inline void
 133 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 134                                  unsigned long offset, size_t size, int direction)
 135 {
 136         BUG_ON(!valid_dma_direction(direction));
 137         if (dma_ops->sync_single_range_for_device)
 138                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 139                                                       offset, size, direction);
 140
 141         flush_write_buffers();
 142 }
 143
 144 static inline void
 145 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 146                     int nelems, int direction)
 147 {
 148         BUG_ON(!valid_dma_direction(direction));
 149         if (dma_ops->sync_sg_for_cpu)
 150                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 151         flush_write_buffers();
 152 }
 153
 154 static inline void
 155 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 156                        int nelems, int direction)
 157 {
 158         BUG_ON(!valid_dma_direction(direction));
 159         if (dma_ops->sync_sg_for_device) {
 160                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 161         }
 162
 163         flush_write_buffers();
 164 }
 165
 166 static inline int
 167 dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
 168 {
 169         BUG_ON(!valid_dma_direction(direction));
 170         return dma_ops->map_sg(hwdev, sg, nents, direction);
 171 }
 172
 173 static inline void
 174 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 175              int direction)
 176 {
 177         BUG_ON(!valid_dma_direction(direction));
 178         dma_ops->unmap_sg(hwdev, sg, nents, direction);
 179 }
 180
 181 extern int dma_supported(struct device *hwdev, u64 mask);
 182
 183 /* same for gart, swiotlb, and nommu */
 184 static inline int dma_get_cache_alignment(void)
 185 {
 186         return boot_cpu_data.x86_clflush_size;
 187 }
 188
 189 #define dma_is_consistent(d, h) 1
 190
 191 extern int dma_set_mask(struct device *dev, u64 mask);
 192
 193 static inline void
 194 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 195         enum dma_data_direction dir)
 196 {
 197         flush_write_buffers();
 198 }
 199
 200 extern struct device fallback_dev;
 201 extern int panic_on_overflow;
 202
 203 #endif /* _X8664_DMA_MAPPING_H */