include/asm-x86_64/dma-mapping.h

   1 #ifndef _X8664_DMA_MAPPING_H
   2 #define _X8664_DMA_MAPPING_H 1
   3
   4 /*
   5  * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
   6  * documentation.
   7  */
   8
   9 #include <linux/config.h>
  10
  11 #include <asm/scatterlist.h>
  12 #include <asm/io.h>
  13 #include <asm/swiotlb.h>
  14
  15 extern dma_addr_t bad_dma_address;
  16 #define dma_mapping_error(x) \
  17         (swiotlb ? swiotlb_dma_mapping_error(x) : ((x) == bad_dma_address))
  18
  19 void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
  20                          gfp_t gfp);
  21 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  22                          dma_addr_t dma_handle);
  23
  24 #ifdef CONFIG_GART_IOMMU
  25
  26 extern dma_addr_t dma_map_single(struct device *hwdev, void *ptr, size_t size,
  27                                  int direction);
  28 extern void dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
  29                              int direction);
  30
  31 #else
  32
  33 /* No IOMMU */
  34
  35 static inline dma_addr_t dma_map_single(struct device *hwdev, void *ptr,
  36                                         size_t size, int direction)
  37 {
  38         dma_addr_t addr;
  39
  40         if (direction == DMA_NONE)
  41                 out_of_line_bug();
  42         addr = virt_to_bus(ptr);
  43
  44         if ((addr+size) & ~*hwdev->dma_mask)
  45                 out_of_line_bug();
  46         return addr;
  47 }
  48
  49 static inline void dma_unmap_single(struct device *hwdev, dma_addr_t dma_addr,
  50                                     size_t size, int direction)
  51 {
  52         if (direction == DMA_NONE)
  53                 out_of_line_bug();
  54         /* Nothing to do */
  55 }
  56
  57 #endif
  58
  59 #define dma_map_page(dev,page,offset,size,dir) \
  60         dma_map_single((dev), page_address(page)+(offset), (size), (dir))
  61
  62 static inline void dma_sync_single_for_cpu(struct device *hwdev,
  63                                                dma_addr_t dma_handle,
  64                                                size_t size, int direction)
  65 {
  66         if (direction == DMA_NONE)
  67                 out_of_line_bug();
  68
  69         if (swiotlb)
  70                 return swiotlb_sync_single_for_cpu(hwdev,dma_handle,size,direction);
  71
  72         flush_write_buffers();
  73 }
  74
  75 static inline void dma_sync_single_for_device(struct device *hwdev,
  76                                                   dma_addr_t dma_handle,
  77                                                   size_t size, int direction)
  78 {
  79         if (direction == DMA_NONE)
  80                 out_of_line_bug();
  81
  82         if (swiotlb)
  83                 return swiotlb_sync_single_for_device(hwdev,dma_handle,size,direction);
  84
  85         flush_write_buffers();
  86 }
  87
  88 #define dma_sync_single_range_for_cpu(dev, dma_handle, offset, size, dir)       \
  89         dma_sync_single_for_cpu(dev, dma_handle, size, dir)
  90 #define dma_sync_single_range_for_device(dev, dma_handle, offset, size, dir)    \
  91         dma_sync_single_for_device(dev, dma_handle, size, dir)
  92
  93 static inline void dma_sync_sg_for_cpu(struct device *hwdev,
  94                                        struct scatterlist *sg,
  95                                        int nelems, int direction)
  96 {
  97         if (direction == DMA_NONE)
  98                 out_of_line_bug();
  99
 100         if (swiotlb)
 101                 return swiotlb_sync_sg_for_cpu(hwdev,sg,nelems,direction);
 102
 103         flush_write_buffers();
 104 }
 105
 106 static inline void dma_sync_sg_for_device(struct device *hwdev,
 107                                           struct scatterlist *sg,
 108                                           int nelems, int direction)
 109 {
 110         if (direction == DMA_NONE)
 111                 out_of_line_bug();
 112
 113         if (swiotlb)
 114                 return swiotlb_sync_sg_for_device(hwdev,sg,nelems,direction);
 115
 116         flush_write_buffers();
 117 }
 118
 119 extern int dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 120                       int nents, int direction);
 121 extern void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg,
 122                          int nents, int direction);
 123
 124 #define dma_unmap_page dma_unmap_single
 125
 126 extern int dma_supported(struct device *hwdev, u64 mask);
 127 extern int dma_get_cache_alignment(void);
 128 #define dma_is_consistent(h) 1
 129
 130 static inline int dma_set_mask(struct device *dev, u64 mask)
 131 {
 132         if (!dev->dma_mask || !dma_supported(dev, mask))
 133                 return -EIO;
 134         *dev->dma_mask = mask;
 135         return 0;
 136 }
 137
 138 static inline void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
 139 {
 140         flush_write_buffers();
 141 }
 142
 143 #endif