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   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                          unsigned 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 static inline void dma_sync_sg_for_cpu(struct device *hwdev,
  89                                        struct scatterlist *sg,
  90                                        int nelems, int direction)
  91 {
  92         if (direction == DMA_NONE)
  93                 out_of_line_bug();
  94
  95         if (swiotlb)
  96                 return swiotlb_sync_sg_for_cpu(hwdev,sg,nelems,direction);
  97
  98         flush_write_buffers();
  99 }
 100
 101 static inline void dma_sync_sg_for_device(struct device *hwdev,
 102                                           struct scatterlist *sg,
 103                                           int nelems, int direction)
 104 {
 105         if (direction == DMA_NONE)
 106                 out_of_line_bug();
 107
 108         if (swiotlb)
 109                 return swiotlb_sync_sg_for_device(hwdev,sg,nelems,direction);
 110
 111         flush_write_buffers();
 112 }
 113
 114 extern int dma_map_sg(struct device *hwdev, struct scatterlist *sg,
 115                       int nents, int direction);
 116 extern void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg,
 117                          int nents, int direction);
 118
 119 #define dma_unmap_page dma_unmap_single
 120
 121 extern int dma_supported(struct device *hwdev, u64 mask);
 122 extern int dma_get_cache_alignment(void);
 123 #define dma_is_consistent(h) 1
 124
 125 static inline int dma_set_mask(struct device *dev, u64 mask)
 126 {
 127         if (!dev->dma_mask || !dma_supported(dev, mask))
 128                 return -EIO;
 129         *dev->dma_mask = mask;
 130         return 0;
 131 }
 132
 133 static inline void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
 134 {
 135         flush_write_buffers();
 136 }
 137
 138 #endif