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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
  15 struct dma_mapping_ops {
  16         int             (*mapping_error)(dma_addr_t dma_addr);
  17         void*           (*alloc_coherent)(struct device *dev, size_t size,
  18                                 dma_addr_t *dma_handle, gfp_t gfp);
  19         void            (*free_coherent)(struct device *dev, size_t size,
  20                                 void *vaddr, dma_addr_t dma_handle);
  21         dma_addr_t      (*map_single)(struct device *hwdev, phys_addr_t ptr,
  22                                 size_t size, int direction);
  23         /* like map_single, but doesn't check the device mask */
  24         dma_addr_t      (*map_simple)(struct device *hwdev, phys_addr_t ptr,
  25                                 size_t size, int direction);
  26         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  27                                 size_t size, int direction);
  28         void            (*sync_single_for_cpu)(struct device *hwdev,
  29                                 dma_addr_t dma_handle, size_t size,
  30                                 int direction);
  31         void            (*sync_single_for_device)(struct device *hwdev,
  32                                 dma_addr_t dma_handle, size_t size,
  33                                 int direction);
  34         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  35                                 dma_addr_t dma_handle, unsigned long offset,
  36                                 size_t size, int direction);
  37         void            (*sync_single_range_for_device)(struct device *hwdev,
  38                                 dma_addr_t dma_handle, unsigned long offset,
  39                                 size_t size, int direction);
  40         void            (*sync_sg_for_cpu)(struct device *hwdev,
  41                                 struct scatterlist *sg, int nelems,
  42                                 int direction);
  43         void            (*sync_sg_for_device)(struct device *hwdev,
  44                                 struct scatterlist *sg, int nelems,
  45                                 int direction);
  46         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  47                                 int nents, int direction);
  48         void            (*unmap_sg)(struct device *hwdev,
  49                                 struct scatterlist *sg, int nents,
  50                                 int direction);
  51         int             (*dma_supported)(struct device *hwdev, u64 mask);
  52         int             is_phys;
  53 };
  54
  55 extern const struct dma_mapping_ops *dma_ops;
  56
  57 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  58 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  59
  60 void *dma_alloc_coherent(struct device *dev, size_t size,
  61                            dma_addr_t *dma_handle, gfp_t flag);
  62
  63 void dma_free_coherent(struct device *dev, size_t size,
  64                          void *vaddr, dma_addr_t dma_handle);
  65
  66
  67 extern int dma_supported(struct device *hwdev, u64 mask);
  68 extern int dma_set_mask(struct device *dev, u64 mask);
  69
  70 #ifdef CONFIG_X86_32
  71 # include "dma-mapping_32.h"
  72 #else
  73 # include "dma-mapping_64.h"
  74 #endif
  75
  76 static inline dma_addr_t
  77 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  78                int direction)
  79 {
  80         BUG_ON(!valid_dma_direction(direction));
  81         return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
  82 }
  83
  84 static inline void
  85 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  86                  int direction)
  87 {
  88         BUG_ON(!valid_dma_direction(direction));
  89         if (dma_ops->unmap_single)
  90                 dma_ops->unmap_single(dev, addr, size, direction);
  91 }
  92
  93 static inline int
  94 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
  95            int nents, int direction)
  96 {
  97         BUG_ON(!valid_dma_direction(direction));
  98         return dma_ops->map_sg(hwdev, sg, nents, direction);
  99 }
 100
 101 static inline void
 102 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 103              int direction)
 104 {
 105         BUG_ON(!valid_dma_direction(direction));
 106         if (dma_ops->unmap_sg)
 107                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
 108 }
 109
 110 static inline void
 111 dma_sync_single_for_cpu(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_cpu)
 116                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 117                                              direction);
 118         flush_write_buffers();
 119 }
 120
 121 static inline void
 122 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 123                            size_t size, int direction)
 124 {
 125         BUG_ON(!valid_dma_direction(direction));
 126         if (dma_ops->sync_single_for_device)
 127                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 128                                                 direction);
 129         flush_write_buffers();
 130 }
 131
 132 static inline void
 133 dma_sync_single_range_for_cpu(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_cpu)
 138                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 139                                                    size, direction);
 140
 141         flush_write_buffers();
 142 }
 143
 144 static inline void
 145 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 146                                  unsigned long offset, size_t size,
 147                                  int direction)
 148 {
 149         BUG_ON(!valid_dma_direction(direction));
 150         if (dma_ops->sync_single_range_for_device)
 151                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 152                                                       offset, size, direction);
 153
 154         flush_write_buffers();
 155 }
 156
 157 static inline void
 158 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 159                     int nelems, int direction)
 160 {
 161         BUG_ON(!valid_dma_direction(direction));
 162         if (dma_ops->sync_sg_for_cpu)
 163                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 164         flush_write_buffers();
 165 }
 166
 167 static inline void
 168 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 169                        int nelems, int direction)
 170 {
 171         BUG_ON(!valid_dma_direction(direction));
 172         if (dma_ops->sync_sg_for_device)
 173                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 174
 175         flush_write_buffers();
 176 }
 177
 178 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 179                                       size_t offset, size_t size,
 180                                       int direction)
 181 {
 182         BUG_ON(!valid_dma_direction(direction));
 183         return dma_ops->map_single(dev, page_to_phys(page)+offset,
 184                                    size, direction);
 185 }
 186
 187 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 188                                   size_t size, int direction)
 189 {
 190         dma_unmap_single(dev, addr, size, direction);
 191 }
 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 #endif