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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 extern dma_addr_t bad_dma_address;
  14 extern int iommu_merge;
  15 extern struct device fallback_dev;
  16 extern int panic_on_overflow;
  17 extern int force_iommu;
  18
  19 struct dma_mapping_ops {
  20         int             (*mapping_error)(dma_addr_t dma_addr);
  21         void*           (*alloc_coherent)(struct device *dev, size_t size,
  22                                 dma_addr_t *dma_handle, gfp_t gfp);
  23         void            (*free_coherent)(struct device *dev, size_t size,
  24                                 void *vaddr, dma_addr_t dma_handle);
  25         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
  26                                 size_t size, int direction);
  27         /* like map_single, but doesn't check the device mask */
  28         dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
  29                                 size_t size, int direction);
  30         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  31                                 size_t size, int direction);
  32         void            (*sync_single_for_cpu)(struct device *hwdev,
  33                                 dma_addr_t dma_handle, size_t size,
  34                                 int direction);
  35         void            (*sync_single_for_device)(struct device *hwdev,
  36                                 dma_addr_t dma_handle, size_t size,
  37                                 int direction);
  38         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  39                                 dma_addr_t dma_handle, unsigned long offset,
  40                                 size_t size, int direction);
  41         void            (*sync_single_range_for_device)(struct device *hwdev,
  42                                 dma_addr_t dma_handle, unsigned long offset,
  43                                 size_t size, int direction);
  44         void            (*sync_sg_for_cpu)(struct device *hwdev,
  45                                 struct scatterlist *sg, int nelems,
  46                                 int direction);
  47         void            (*sync_sg_for_device)(struct device *hwdev,
  48                                 struct scatterlist *sg, int nelems,
  49                                 int direction);
  50         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  51                                 int nents, int direction);
  52         void            (*unmap_sg)(struct device *hwdev,
  53                                 struct scatterlist *sg, int nents,
  54                                 int direction);
  55         int             (*dma_supported)(struct device *hwdev, u64 mask);
  56         int             is_phys;
  57 };
  58
  59 extern const struct dma_mapping_ops *dma_ops;
  60
  61 static inline int dma_mapping_error(dma_addr_t dma_addr)
  62 {
  63         if (dma_ops->mapping_error)
  64                 return dma_ops->mapping_error(dma_addr);
  65
  66         return (dma_addr == bad_dma_address);
  67 }
  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 void *dma_alloc_coherent(struct device *dev, size_t size,
  73                            dma_addr_t *dma_handle, gfp_t flag);
  74
  75 void dma_free_coherent(struct device *dev, size_t size,
  76                          void *vaddr, dma_addr_t dma_handle);
  77
  78
  79 extern int dma_supported(struct device *hwdev, u64 mask);
  80 extern int dma_set_mask(struct device *dev, u64 mask);
  81
  82 static inline dma_addr_t
  83 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  84                int direction)
  85 {
  86         BUG_ON(!valid_dma_direction(direction));
  87         return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
  88 }
  89
  90 static inline void
  91 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  92                  int direction)
  93 {
  94         BUG_ON(!valid_dma_direction(direction));
  95         if (dma_ops->unmap_single)
  96                 dma_ops->unmap_single(dev, addr, size, direction);
  97 }
  98
  99 static inline int
 100 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 101            int nents, int direction)
 102 {
 103         BUG_ON(!valid_dma_direction(direction));
 104         return dma_ops->map_sg(hwdev, sg, nents, direction);
 105 }
 106
 107 static inline void
 108 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 109              int direction)
 110 {
 111         BUG_ON(!valid_dma_direction(direction));
 112         if (dma_ops->unmap_sg)
 113                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
 114 }
 115
 116 static inline void
 117 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 118                         size_t size, int direction)
 119 {
 120         BUG_ON(!valid_dma_direction(direction));
 121         if (dma_ops->sync_single_for_cpu)
 122                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 123                                              direction);
 124         flush_write_buffers();
 125 }
 126
 127 static inline void
 128 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 129                            size_t size, int direction)
 130 {
 131         BUG_ON(!valid_dma_direction(direction));
 132         if (dma_ops->sync_single_for_device)
 133                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 134                                                 direction);
 135         flush_write_buffers();
 136 }
 137
 138 static inline void
 139 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 140                               unsigned long offset, size_t size, int direction)
 141 {
 142         BUG_ON(!valid_dma_direction(direction));
 143         if (dma_ops->sync_single_range_for_cpu)
 144                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 145                                                    size, direction);
 146
 147         flush_write_buffers();
 148 }
 149
 150 static inline void
 151 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 152                                  unsigned long offset, size_t size,
 153                                  int direction)
 154 {
 155         BUG_ON(!valid_dma_direction(direction));
 156         if (dma_ops->sync_single_range_for_device)
 157                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 158                                                       offset, size, direction);
 159
 160         flush_write_buffers();
 161 }
 162
 163 static inline void
 164 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 165                     int nelems, int direction)
 166 {
 167         BUG_ON(!valid_dma_direction(direction));
 168         if (dma_ops->sync_sg_for_cpu)
 169                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 170         flush_write_buffers();
 171 }
 172
 173 static inline void
 174 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 175                        int nelems, int direction)
 176 {
 177         BUG_ON(!valid_dma_direction(direction));
 178         if (dma_ops->sync_sg_for_device)
 179                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 180
 181         flush_write_buffers();
 182 }
 183
 184 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 185                                       size_t offset, size_t size,
 186                                       int direction)
 187 {
 188         BUG_ON(!valid_dma_direction(direction));
 189         return dma_ops->map_single(dev, page_to_phys(page)+offset,
 190                                    size, direction);
 191 }
 192
 193 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 194                                   size_t size, int direction)
 195 {
 196         dma_unmap_single(dev, addr, size, direction);
 197 }
 198
 199 static inline void
 200 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 201         enum dma_data_direction dir)
 202 {
 203         flush_write_buffers();
 204 }
 205
 206 static inline int dma_get_cache_alignment(void)
 207 {
 208         /* no easy way to get cache size on all x86, so return the
 209          * maximum possible, to be safe */
 210         return boot_cpu_data.x86_clflush_size;
 211 }
 212
 213 #define dma_is_consistent(d, h) (1)
 214
 215 #ifdef CONFIG_X86_32
 216 #  define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 217 struct dma_coherent_mem {
 218         void            *virt_base;
 219         u32             device_base;
 220         int             size;
 221         int             flags;
 222         unsigned long   *bitmap;
 223 };
 224
 225 extern int
 226 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 227                             dma_addr_t device_addr, size_t size, int flags);
 228
 229 extern void
 230 dma_release_declared_memory(struct device *dev);
 231
 232 extern void *
 233 dma_mark_declared_memory_occupied(struct device *dev,
 234                                   dma_addr_t device_addr, size_t size);
 235 #endif /* CONFIG_X86_32 */
 236 #endif