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, phys_addr_t 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, phys_addr_t 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;
55 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
56 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
58 void *dma_alloc_coherent(struct device *dev, size_t size,
59 dma_addr_t *dma_handle, gfp_t flag);
61 void dma_free_coherent(struct device *dev, size_t size,
62 void *vaddr, dma_addr_t dma_handle);
66 # include "dma-mapping_32.h"
68 # include "dma-mapping_64.h"
71 static inline dma_addr_t
72 dma_map_single(struct device *hwdev, void *ptr, size_t size,
75 BUG_ON(!valid_dma_direction(direction));
76 return dma_ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
80 dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
83 BUG_ON(!valid_dma_direction(direction));
84 if (dma_ops->unmap_single)
85 dma_ops->unmap_single(dev, addr, size, direction);
89 dma_map_sg(struct device *hwdev, struct scatterlist *sg,
90 int nents, int direction)
92 BUG_ON(!valid_dma_direction(direction));
93 return dma_ops->map_sg(hwdev, sg, nents, direction);
97 dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
100 BUG_ON(!valid_dma_direction(direction));
101 if (dma_ops->unmap_sg)
102 dma_ops->unmap_sg(hwdev, sg, nents, direction);
106 dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
107 size_t size, int direction)
109 BUG_ON(!valid_dma_direction(direction));
110 if (dma_ops->sync_single_for_cpu)
111 dma_ops->sync_single_for_cpu(hwdev, dma_handle, size,
113 flush_write_buffers();
117 dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
118 size_t size, int direction)
120 BUG_ON(!valid_dma_direction(direction));
121 if (dma_ops->sync_single_for_device)
122 dma_ops->sync_single_for_device(hwdev, dma_handle, size,
124 flush_write_buffers();
128 dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
129 unsigned long offset, size_t size, int direction)
131 BUG_ON(!valid_dma_direction(direction));
132 if (dma_ops->sync_single_range_for_cpu)
133 dma_ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
136 flush_write_buffers();
140 dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
141 unsigned long offset, size_t size,
144 BUG_ON(!valid_dma_direction(direction));
145 if (dma_ops->sync_single_range_for_device)
146 dma_ops->sync_single_range_for_device(hwdev, dma_handle,
147 offset, size, direction);
149 flush_write_buffers();
153 dma_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
154 int nelems, int direction)
156 BUG_ON(!valid_dma_direction(direction));
157 if (dma_ops->sync_sg_for_cpu)
158 dma_ops->sync_sg_for_cpu(hwdev, sg, nelems, direction);
159 flush_write_buffers();
163 dma_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
164 int nelems, int direction)
166 BUG_ON(!valid_dma_direction(direction));
167 if (dma_ops->sync_sg_for_device)
168 dma_ops->sync_sg_for_device(hwdev, sg, nelems, direction);
170 flush_write_buffers();
173 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
174 size_t offset, size_t size,
177 BUG_ON(!valid_dma_direction(direction));
178 return dma_ops->map_single(dev, page_to_phys(page)+offset,
182 static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
183 size_t size, int direction)
185 dma_unmap_single(dev, addr, size, direction);
189 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
190 enum dma_data_direction dir)
192 flush_write_buffers();