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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 valid_dma_direction(int dma_direction)
  59 {
  60         return ((dma_direction == DMA_BIDIRECTIONAL) ||
  61                 (dma_direction == DMA_TO_DEVICE) ||
  62                 (dma_direction == DMA_FROM_DEVICE));
  63 }
  64
  65 static inline int dma_mapping_error(dma_addr_t dma_addr)
  66 {
  67         if (dma_ops->mapping_error)
  68                 return dma_ops->mapping_error(dma_addr);
  69
  70         return (dma_addr == bad_dma_address);
  71 }
  72
  73 extern void *dma_alloc_coherent(struct device *dev, size_t size,
  74                                 dma_addr_t *dma_handle, gfp_t gfp);
  75 extern void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  76                               dma_addr_t dma_handle);
  77
  78 static inline dma_addr_t
  79 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  80                int direction)
  81 {
  82         BUG_ON(!valid_dma_direction(direction));
  83         return dma_ops->map_single(hwdev, ptr, size, direction);
  84 }
  85
  86 static inline void
  87 dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
  88                  int direction)
  89 {
  90         BUG_ON(!valid_dma_direction(direction));
  91         dma_ops->unmap_single(dev, addr, size, direction);
  92 }
  93
  94 #define dma_map_page(dev,page,offset,size,dir) \
  95         dma_map_single((dev), page_address(page)+(offset), (size), (dir))
  96
  97 #define dma_unmap_page dma_unmap_single
  98
  99 static inline void
 100 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 101                         size_t size, int direction)
 102 {
 103         BUG_ON(!valid_dma_direction(direction));
 104         if (dma_ops->sync_single_for_cpu)
 105                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 106                                              direction);
 107         flush_write_buffers();
 108 }
 109
 110 static inline void
 111 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 112                            size_t size, int direction)
 113 {
 114         BUG_ON(!valid_dma_direction(direction));
 115         if (dma_ops->sync_single_for_device)
 116                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 117                                                 direction);
 118         flush_write_buffers();
 119 }
 120
 121 static inline void
 122 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 123                               unsigned long offset, size_t size, int direction)
 124 {
 125         BUG_ON(!valid_dma_direction(direction));
 126         if (dma_ops->sync_single_range_for_cpu) {
 127                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset, size, direction);
 128         }
 129
 130         flush_write_buffers();
 131 }
 132
 133 static inline void
 134 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 135                                  unsigned long offset, size_t size, int direction)
 136 {
 137         BUG_ON(!valid_dma_direction(direction));
 138         if (dma_ops->sync_single_range_for_device)
 139                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 140                                                       offset, size, direction);
 141
 142         flush_write_buffers();
 143 }
 144
 145 static inline void
 146 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 147                     int nelems, int direction)
 148 {
 149         BUG_ON(!valid_dma_direction(direction));
 150         if (dma_ops->sync_sg_for_cpu)
 151                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 152         flush_write_buffers();
 153 }
 154
 155 static inline void
 156 dma_sync_sg_for_device(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_device) {
 161                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 162         }
 163
 164         flush_write_buffers();
 165 }
 166
 167 static inline int
 168 dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents, int direction)
 169 {
 170         BUG_ON(!valid_dma_direction(direction));
 171         return dma_ops->map_sg(hwdev, sg, nents, direction);
 172 }
 173
 174 static inline void
 175 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 176              int direction)
 177 {
 178         BUG_ON(!valid_dma_direction(direction));
 179         dma_ops->unmap_sg(hwdev, sg, nents, direction);
 180 }
 181
 182 extern int dma_supported(struct device *hwdev, u64 mask);
 183
 184 /* same for gart, swiotlb, and nommu */
 185 static inline int dma_get_cache_alignment(void)
 186 {
 187         return boot_cpu_data.x86_clflush_size;
 188 }
 189
 190 #define dma_is_consistent(h) 1
 191
 192 extern int dma_set_mask(struct device *dev, u64 mask);
 193
 194 static inline void
 195 dma_cache_sync(void *vaddr, size_t size, 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 */