1 #ifndef _ASM_DMA_MAPPING_H_
2 #define _ASM_DMA_MAPPING_H_
5 * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
9 #include <linux/scatterlist.h>
11 #include <asm/swiotlb.h>
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,
29 void (*sync_single_for_device)(struct device *hwdev,
30 dma_addr_t dma_handle, size_t size,
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,
41 void (*sync_sg_for_device)(struct device *hwdev,
42 struct scatterlist *sg, int nelems,
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,
49 int (*dma_supported)(struct device *hwdev, u64 mask);
53 extern const struct dma_mapping_ops *dma_ops;
56 # include "dma-mapping_32.h"
58 # include "dma-mapping_64.h"
61 static inline dma_addr_t
62 dma_map_single(struct device *hwdev, void *ptr, size_t size,
65 BUG_ON(!valid_dma_direction(direction));
66 return dma_ops->map_single(hwdev, ptr, size, direction);
70 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
73 BUG_ON(!valid_dma_direction(direction));
74 if (dma_ops->unmap_single)
75 dma_ops->unmap_single(dev, addr, size, direction);
79 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
80 int nents, int direction)
82 BUG_ON(!valid_dma_direction(direction));
83 return dma_ops->map_sg(hwdev, sg, nents, direction);
87 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
90 BUG_ON(!valid_dma_direction(direction));
91 if (dma_ops->unmap_sg)
92 dma_ops->unmap_sg(hwdev, sg, nents, direction);
96 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
97 size_t size, int direction)
99 BUG_ON(!valid_dma_direction(direction));
100 if (dma_ops->sync_single_for_cpu)
101 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
103 flush_write_buffers();
107 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
108 size_t size, int direction)
110 BUG_ON(!valid_dma_direction(direction));
111 if (dma_ops->sync_single_for_device)
112 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
114 flush_write_buffers();
118 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
119 unsigned long offset, size_t size, int direction)
121 BUG_ON(!valid_dma_direction(direction));
122 if (dma_ops->sync_single_range_for_cpu)
123 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
126 flush_write_buffers();
130 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
131 unsigned long offset, size_t size,
134 BUG_ON(!valid_dma_direction(direction));
135 if (dma_ops->sync_single_range_for_device)
136 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
137 offset, size, direction);
139 flush_write_buffers();