1 #ifndef _ASM_GENERIC_DMA_MAPPING_H
2 #define _ASM_GENERIC_DMA_MAPPING_H
3
4 /* define the dma api to allow compilation but not linking of
5 * dma dependent code. Code that depends on the dma-mapping
6 * API needs to set 'depends on HAS_DMA' in its Kconfig
7 */
8
9 struct scatterlist;
10
11 extern void *
12 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
13 gfp_t flag);
14
15 extern void
16 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
17 dma_addr_t dma_handle);
18
dma_alloc_attrs(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t flag,struct dma_attrs * attrs)19 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
20 dma_addr_t *dma_handle, gfp_t flag,
21 struct dma_attrs *attrs)
22 {
23 /* attrs is not supported and ignored */
24 return dma_alloc_coherent(dev, size, dma_handle, flag);
25 }
26
dma_free_attrs(struct device * dev,size_t size,void * cpu_addr,dma_addr_t dma_handle,struct dma_attrs * attrs)27 static inline void dma_free_attrs(struct device *dev, size_t size,
28 void *cpu_addr, dma_addr_t dma_handle,
29 struct dma_attrs *attrs)
30 {
31 /* attrs is not supported and ignored */
32 dma_free_coherent(dev, size, cpu_addr, dma_handle);
33 }
34
35 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
36 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
37
38 extern dma_addr_t
39 dma_map_single(struct device *dev, void *ptr, size_t size,
40 enum dma_data_direction direction);
41
42 extern void
43 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
44 enum dma_data_direction direction);
45
46 extern int
47 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
48 enum dma_data_direction direction);
49
50 extern void
51 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
52 enum dma_data_direction direction);
53
54 extern dma_addr_t
55 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
56 size_t size, enum dma_data_direction direction);
57
58 extern void
59 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
60 enum dma_data_direction direction);
61
62 extern void
63 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
64 enum dma_data_direction direction);
65
66 extern void
67 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
68 unsigned long offset, size_t size,
69 enum dma_data_direction direction);
70
71 extern void
72 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
73 enum dma_data_direction direction);
74
75 #define dma_sync_single_for_device dma_sync_single_for_cpu
76 #define dma_sync_single_range_for_device dma_sync_single_range_for_cpu
77 #define dma_sync_sg_for_device dma_sync_sg_for_cpu
78
79 extern int
80 dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
81
82 extern int
83 dma_supported(struct device *dev, u64 mask);
84
85 extern int
86 dma_set_mask(struct device *dev, u64 mask);
87
88 extern int
89 dma_get_cache_alignment(void);
90
91 extern void
92 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
93 enum dma_data_direction direction);
94
95 #endif /* _ASM_GENERIC_DMA_MAPPING_H */
96