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
9struct scatterlist;
10
11extern void *
12dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
13		   gfp_t flag);
14
15extern void
16dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
17		    dma_addr_t dma_handle);
18
19static 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
27static 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
38extern dma_addr_t
39dma_map_single(struct device *dev, void *ptr, size_t size,
40	       enum dma_data_direction direction);
41
42extern void
43dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
44		 enum dma_data_direction direction);
45
46extern int
47dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
48	   enum dma_data_direction direction);
49
50extern void
51dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
52	     enum dma_data_direction direction);
53
54extern dma_addr_t
55dma_map_page(struct device *dev, struct page *page, unsigned long offset,
56	     size_t size, enum dma_data_direction direction);
57
58extern void
59dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
60	       enum dma_data_direction direction);
61
62extern void
63dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
64			enum dma_data_direction direction);
65
66extern void
67dma_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
71extern void
72dma_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
79extern int
80dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
81
82extern int
83dma_supported(struct device *dev, u64 mask);
84
85extern int
86dma_set_mask(struct device *dev, u64 mask);
87
88extern int
89dma_get_cache_alignment(void);
90
91extern void
92dma_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