SAFE public projects git trees. - safe/jmp/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 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 static inline int dma_mapping_error(dma_addr_t dma_addr)
  58 {
  59         if (dma_ops->mapping_error)
  60                 return dma_ops->mapping_error(dma_addr);
  61
  62         return (dma_addr == bad_dma_address);
  63 }
  64
  65 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  66 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
  67
  68 void *dma_alloc_coherent(struct device *dev, size_t size,
  69                            dma_addr_t *dma_handle, gfp_t flag);
  70
  71 void dma_free_coherent(struct device *dev, size_t size,
  72                          void *vaddr, dma_addr_t dma_handle);
  73
  74
  75 extern int dma_supported(struct device *hwdev, u64 mask);
  76 extern int dma_set_mask(struct device *dev, u64 mask);
  77
  78 #ifdef CONFIG_X86_32
  79 # include "dma-mapping_32.h"
  80 #else
  81 # include "dma-mapping_64.h"
  82 #endif
  83
  84 static inline dma_addr_t
  85 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  86                int direction)
  87 {
  88         BUG_ON(!valid_dma_direction(direction));
  89         return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
  90 }
  91
  92 static inline void
  93 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  94                  int direction)
  95 {
  96         BUG_ON(!valid_dma_direction(direction));
  97         if (dma_ops->unmap_single)
  98                 dma_ops->unmap_single(dev, addr, size, direction);
  99 }
 100
 101 static inline int
 102 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 103            int nents, int direction)
 104 {
 105         BUG_ON(!valid_dma_direction(direction));
 106         return dma_ops->map_sg(hwdev, sg, nents, direction);
 107 }
 108
 109 static inline void
 110 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
 111              int direction)
 112 {
 113         BUG_ON(!valid_dma_direction(direction));
 114         if (dma_ops->unmap_sg)
 115                 dma_ops->unmap_sg(hwdev, sg, nents, direction);
 116 }
 117
 118 static inline void
 119 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 120                         size_t size, int direction)
 121 {
 122         BUG_ON(!valid_dma_direction(direction));
 123         if (dma_ops->sync_single_for_cpu)
 124                 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
 125                                              direction);
 126         flush_write_buffers();
 127 }
 128
 129 static inline void
 130 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 131                            size_t size, int direction)
 132 {
 133         BUG_ON(!valid_dma_direction(direction));
 134         if (dma_ops->sync_single_for_device)
 135                 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
 136                                                 direction);
 137         flush_write_buffers();
 138 }
 139
 140 static inline void
 141 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 142                               unsigned long offset, size_t size, int direction)
 143 {
 144         BUG_ON(!valid_dma_direction(direction));
 145         if (dma_ops->sync_single_range_for_cpu)
 146                 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
 147                                                    size, direction);
 148
 149         flush_write_buffers();
 150 }
 151
 152 static inline void
 153 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
 154                                  unsigned long offset, size_t size,
 155                                  int direction)
 156 {
 157         BUG_ON(!valid_dma_direction(direction));
 158         if (dma_ops->sync_single_range_for_device)
 159                 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
 160                                                       offset, size, direction);
 161
 162         flush_write_buffers();
 163 }
 164
 165 static inline void
 166 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
 167                     int nelems, int direction)
 168 {
 169         BUG_ON(!valid_dma_direction(direction));
 170         if (dma_ops->sync_sg_for_cpu)
 171                 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
 172         flush_write_buffers();
 173 }
 174
 175 static inline void
 176 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
 177                        int nelems, int direction)
 178 {
 179         BUG_ON(!valid_dma_direction(direction));
 180         if (dma_ops->sync_sg_for_device)
 181                 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
 182
 183         flush_write_buffers();
 184 }
 185
 186 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 187                                       size_t offset, size_t size,
 188                                       int direction)
 189 {
 190         BUG_ON(!valid_dma_direction(direction));
 191         return dma_ops->map_single(dev, page_to_phys(page)+offset,
 192                                    size, direction);
 193 }
 194
 195 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
 196                                   size_t size, int direction)
 197 {
 198         dma_unmap_single(dev, addr, size, direction);
 199 }
 200
 201 static inline void
 202 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 203         enum dma_data_direction dir)
 204 {
 205         flush_write_buffers();
 206 }
 207 #endif