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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 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 #ifdef CONFIG_X86_32
  56 # include "dma-mapping_32.h"
  57 #else
  58 # include "dma-mapping_64.h"
  59 #endif
  60
  61 static inline dma_addr_t
  62 dma_map_single(struct device *hwdev, void *ptr, size_t size,
  63                int direction)
  64 {
  65         BUG_ON(!valid_dma_direction(direction));
  66         return dma_ops->map_single(hwdev, ptr, size, direction);
  67 }
  68
  69 static inline void
  70 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
  71                  int direction)
  72 {
  73         BUG_ON(!valid_dma_direction(direction));
  74         if (dma_ops->unmap_single)
  75                 dma_ops->unmap_single(dev, addr, size, direction);
  76 }
  77
  78 static inline int
  79 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
  80            int nents, int direction)
  81 {
  82         BUG_ON(!valid_dma_direction(direction));
  83         return dma_ops->map_sg(hwdev, sg, nents, direction);
  84 }
  85 #endif