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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
  18 struct dma_mapping_ops {
  19         int             (*mapping_error)(dma_addr_t dma_addr);
  20         void*           (*alloc_coherent)(struct device *dev, size_t size,
  21                                 dma_addr_t *dma_handle, gfp_t gfp);
  22         void            (*free_coherent)(struct device *dev, size_t size,
  23                                 void *vaddr, dma_addr_t dma_handle);
  24         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
  25                                 size_t size, int direction);
  26         /* like map_single, but doesn't check the device mask */
  27         dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
  28                                 size_t size, int direction);
  29         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  30                                 size_t size, int direction);
  31         void            (*sync_single_for_cpu)(struct device *hwdev,
  32                                 dma_addr_t dma_handle, size_t size,
  33                                 int direction);
  34         void            (*sync_single_for_device)(struct device *hwdev,
  35                                 dma_addr_t dma_handle, size_t size,
  36                                 int direction);
  37         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  38                                 dma_addr_t dma_handle, unsigned long offset,
  39                                 size_t size, int direction);
  40         void            (*sync_single_range_for_device)(struct device *hwdev,
  41                                 dma_addr_t dma_handle, unsigned long offset,
  42                                 size_t size, int direction);
  43         void            (*sync_sg_for_cpu)(struct device *hwdev,
  44                                 struct scatterlist *sg, int nelems,
  45                                 int direction);
  46         void            (*sync_sg_for_device)(struct device *hwdev,
  47                                 struct scatterlist *sg, int nelems,
  48                                 int direction);
  49         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  50                                 int nents, int direction);
  51         void            (*unmap_sg)(struct device *hwdev,
  52                                 struct scatterlist *sg, int nents,
  53                                 int direction);
  54         int             (*dma_supported)(struct device *hwdev, u64 mask);
  55         int             is_phys;
  56 };
  57
  58 extern const struct dma_mapping_ops *dma_ops;
  59
  60 static inline int dma_mapping_error(dma_addr_t dma_addr)
  61 {
  62         if (dma_ops->mapping_error)
  63                 return dma_ops->mapping_error(dma_addr);
  64
  65         return (dma_addr == bad_dma_address);
  66 }
  67
  68 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  69 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  70
  71 void *dma_alloc_coherent(struct device *dev, size_t size,
  72                            dma_addr_t *dma_handle, gfp_t flag);
  73
  74 void dma_free_coherent(struct device *dev, size_t size,
  75                          void *vaddr, dma_addr_t dma_handle);
  76
  77
  78 extern int dma_supported(struct device *hwdev, u64 mask);
  79 extern int dma_set_mask(struct device *dev, u64 mask);
  80
  81 static inline dma_addr_t
  82 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  83                int direction)
  84 {
  85         BUG_ON(!valid_dma_direction(direction));
  86         return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
  87 }
  88
  89 static inline void
  90 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  91                  int direction)
  92 {
  93         BUG_ON(!valid_dma_direction(direction));
  94         if (dma_ops->unmap_single)
  95                 dma_ops->unmap_single(dev, addr, size, direction);
  96 }
  97
  98 static inline int
  99 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 100            int nents, int direction)
 101 {
 102         BUG_ON(!valid_dma_direction(direction));
 103         return dma_ops->map_sg(hwdev, sg, nents, direction);
 104 }
 105
 106 static inline void
 107 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 108              int direction)
 109 {
 110         BUG_ON(!valid_dma_direction(direction));
 111         if (dma_ops->unmap_sg)
 112                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
 113 }
 114
 115 static inline void
 116 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 117                         size_t size, int direction)
 118 {
 119         BUG_ON(!valid_dma_direction(direction));
 120         if (dma_ops->sync_single_for_cpu)
 121                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 122                                              direction);
 123         flush_write_buffers();
 124 }
 125
 126 static inline void
 127 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 128                            size_t size, int direction)
 129 {
 130         BUG_ON(!valid_dma_direction(direction));
 131         if (dma_ops->sync_single_for_device)
 132                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 133                                                 direction);
 134         flush_write_buffers();
 135 }
 136
 137 static inline void
 138 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 139                               unsigned long offset, size_t size, int direction)
 140 {
 141         BUG_ON(!valid_dma_direction(direction));
 142         if (dma_ops->sync_single_range_for_cpu)
 143                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 144                                                    size, direction);
 145
 146         flush_write_buffers();
 147 }
 148
 149 static inline void
 150 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 151                                  unsigned long offset, size_t size,
 152                                  int direction)
 153 {
 154         BUG_ON(!valid_dma_direction(direction));
 155         if (dma_ops->sync_single_range_for_device)
 156                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 157                                                       offset, size, direction);
 158
 159         flush_write_buffers();
 160 }
 161
 162 static inline void
 163 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 164                     int nelems, int direction)
 165 {
 166         BUG_ON(!valid_dma_direction(direction));
 167         if (dma_ops->sync_sg_for_cpu)
 168                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 169         flush_write_buffers();
 170 }
 171
 172 static inline void
 173 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 174                        int nelems, int direction)
 175 {
 176         BUG_ON(!valid_dma_direction(direction));
 177         if (dma_ops->sync_sg_for_device)
 178                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 179
 180         flush_write_buffers();
 181 }
 182
 183 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 184                                       size_t offset, size_t size,
 185                                       int direction)
 186 {
 187         BUG_ON(!valid_dma_direction(direction));
 188         return dma_ops->map_single(dev, page_to_phys(page)+offset,
 189                                    size, direction);
 190 }
 191
 192 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 193                                   size_t size, int direction)
 194 {
 195         dma_unmap_single(dev, addr, size, direction);
 196 }
 197
 198 static inline void
 199 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 200         enum dma_data_direction dir)
 201 {
 202         flush_write_buffers();
 203 }
 204
 205 static inline int dma_get_cache_alignment(void)
 206 {
 207         /* no easy way to get cache size on all x86, so return the
 208          * maximum possible, to be safe */
 209         return boot_cpu_data.x86_clflush_size;
 210 }
 211
 212 #define dma_is_consistent(d, h) (1)
 213
 214 #ifdef CONFIG_X86_32
 215 #  define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 216 extern int
 217 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 218                             dma_addr_t device_addr, size_t size, int flags);
 219
 220 extern void
 221 dma_release_declared_memory(struct device *dev);
 222
 223 extern void *
 224 dma_mark_declared_memory_occupied(struct device *dev,
 225                                   dma_addr_t device_addr, size_t size);
 226 extern int forbid_dac;
 227 #endif /* CONFIG_X86_32 */
 228 #endif