git.oblomov.eu Git - linux-2.6/blob - include/asm-x86/dma-mapping.h

   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 struct dma_mapping_ops {
  14         int             (*mapping_error)(dma_addr_t dma_addr);
  15         void*           (*alloc_coherent)(struct device *dev, size_t size,
  16                                 dma_addr_t *dma_handle, gfp_t gfp);
  17         void            (*free_coherent)(struct device *dev, size_t size,
  18                                 void *vaddr, dma_addr_t dma_handle);
  19         dma_addr_t      (*map_single)(struct device *hwdev, void *ptr,
  20                                 size_t size, int direction);
  21         /* like map_single, but doesn't check the device mask */
  22         dma_addr_t      (*map_simple)(struct device *hwdev, char *ptr,
  23                                 size_t size, int direction);
  24         void            (*unmap_single)(struct device *dev, dma_addr_t addr,
  25                                 size_t size, int direction);
  26         void            (*sync_single_for_cpu)(struct device *hwdev,
  27                                 dma_addr_t dma_handle, size_t size,
  28                                 int direction);
  29         void            (*sync_single_for_device)(struct device *hwdev,
  30                                 dma_addr_t dma_handle, size_t size,
  31                                 int direction);
  32         void            (*sync_single_range_for_cpu)(struct device *hwdev,
  33                                 dma_addr_t dma_handle, unsigned long offset,
  34                                 size_t size, int direction);
  35         void            (*sync_single_range_for_device)(struct device *hwdev,
  36                                 dma_addr_t dma_handle, unsigned long offset,
  37                                 size_t size, int direction);
  38         void            (*sync_sg_for_cpu)(struct device *hwdev,
  39                                 struct scatterlist *sg, int nelems,
  40                                 int direction);
  41         void            (*sync_sg_for_device)(struct device *hwdev,
  42                                 struct scatterlist *sg, int nelems,
  43                                 int direction);
  44         int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
  45                                 int nents, int direction);
  46         void            (*unmap_sg)(struct device *hwdev,
  47                                 struct scatterlist *sg, int nents,
  48                                 int direction);
  49         int             (*dma_supported)(struct device *hwdev, u64 mask);
  50         int             is_phys;
  51 };
  52
  53 extern const struct dma_mapping_ops *dma_ops;
  54
  55 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  56 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  57
  58 void *dma_alloc_coherent(struct device *dev, size_t size,
  59                            dma_addr_t *dma_handle, gfp_t flag);
  60
  61 void dma_free_coherent(struct device *dev, size_t size,
  62                          void *vaddr, dma_addr_t dma_handle);
  63
  64
  65 #ifdef CONFIG_X86_32
  66 # include "dma-mapping_32.h"
  67 #else
  68 # include "dma-mapping_64.h"
  69 #endif
  70
  71 static inline dma_addr_t
  72 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  73                int direction)
  74 {
  75         BUG_ON(!valid_dma_direction(direction));
  76         return dma_ops->map_single(hwdev, ptr, size, direction);
  77 }
  78
  79 static inline void
  80 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  81                  int direction)
  82 {
  83         BUG_ON(!valid_dma_direction(direction));
  84         if (dma_ops->unmap_single)
  85                 dma_ops->unmap_single(dev, addr, size, direction);
  86 }
  87
  88 static inline int
  89 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
  90            int nents, int direction)
  91 {
  92         BUG_ON(!valid_dma_direction(direction));
  93         return dma_ops->map_sg(hwdev, sg, nents, direction);
  94 }
  95
  96 static inline void
  97 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  98              int direction)
  99 {
 100         BUG_ON(!valid_dma_direction(direction));
 101         if (dma_ops->unmap_sg)
 102                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
 103 }
 104
 105 static inline void
 106 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 107                         size_t size, int direction)
 108 {
 109         BUG_ON(!valid_dma_direction(direction));
 110         if (dma_ops->sync_single_for_cpu)
 111                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 112                                              direction);
 113         flush_write_buffers();
 114 }
 115
 116 static inline void
 117 dma_sync_single_for_device(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_device)
 122                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 123                                                 direction);
 124         flush_write_buffers();
 125 }
 126
 127 static inline void
 128 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 129                               unsigned long offset, size_t size, int direction)
 130 {
 131         BUG_ON(!valid_dma_direction(direction));
 132         if (dma_ops->sync_single_range_for_cpu)
 133                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 134                                                    size, direction);
 135
 136         flush_write_buffers();
 137 }
 138
 139 static inline void
 140 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 141                                  unsigned long offset, size_t size,
 142                                  int direction)
 143 {
 144         BUG_ON(!valid_dma_direction(direction));
 145         if (dma_ops->sync_single_range_for_device)
 146                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 147                                                       offset, size, direction);
 148
 149         flush_write_buffers();
 150 }
 151
 152 static inline void
 153 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 154                     int nelems, int direction)
 155 {
 156         BUG_ON(!valid_dma_direction(direction));
 157         if (dma_ops->sync_sg_for_cpu)
 158                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 159         flush_write_buffers();
 160 }
 161
 162 static inline void
 163 dma_sync_sg_for_device(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_device)
 168                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 169
 170         flush_write_buffers();
 171 }
 172
 173 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 174                                       size_t offset, size_t size,
 175                                       int direction)
 176 {
 177         return dma_map_single(dev, page_address(page)+offset, size, direction);
 178 }
 179
 180 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 181                                   size_t size, int direction)
 182 {
 183         dma_unmap_single(dev, addr, size, direction);
 184 }
 185
 186 #endif