dma-mapping: frv: remove the obsolete and unnecessary DMA API comments
[linux-2.6.git] / arch / frv / include / asm / dma-mapping.h
1 #ifndef _ASM_DMA_MAPPING_H
2 #define _ASM_DMA_MAPPING_H
3
4 #include <linux/device.h>
5 #include <asm/cache.h>
6 #include <asm/cacheflush.h>
7 #include <asm/scatterlist.h>
8 #include <asm/io.h>
9
10 /*
11  * See Documentation/DMA-API.txt for the description of how the
12  * following DMA API should work.
13  */
14
15 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
16 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
17
18 extern unsigned long __nongprelbss dma_coherent_mem_start;
19 extern unsigned long __nongprelbss dma_coherent_mem_end;
20
21 void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp);
22 void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle);
23
24 extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
25                                  enum dma_data_direction direction);
26
27 static inline
28 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
29                       enum dma_data_direction direction)
30 {
31         BUG_ON(direction == DMA_NONE);
32 }
33
34 extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
35                       enum dma_data_direction direction);
36
37 static inline
38 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
39              enum dma_data_direction direction)
40 {
41         BUG_ON(direction == DMA_NONE);
42 }
43
44 extern
45 dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
46                         size_t size, enum dma_data_direction direction);
47
48 static inline
49 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
50                     enum dma_data_direction direction)
51 {
52         BUG_ON(direction == DMA_NONE);
53 }
54
55
56 static inline
57 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
58                              enum dma_data_direction direction)
59 {
60 }
61
62 static inline
63 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
64                                 enum dma_data_direction direction)
65 {
66         flush_write_buffers();
67 }
68
69 static inline
70 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
71                                    unsigned long offset, size_t size,
72                                    enum dma_data_direction direction)
73 {
74 }
75
76 static inline
77 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
78                                       unsigned long offset, size_t size,
79                                       enum dma_data_direction direction)
80 {
81         flush_write_buffers();
82 }
83
84 static inline
85 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
86                          enum dma_data_direction direction)
87 {
88 }
89
90 static inline
91 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
92                             enum dma_data_direction direction)
93 {
94         flush_write_buffers();
95 }
96
97 static inline
98 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
99 {
100         return 0;
101 }
102
103 static inline
104 int dma_supported(struct device *dev, u64 mask)
105 {
106         /*
107          * we fall back to GFP_DMA when the mask isn't all 1s,
108          * so we can't guarantee allocations that must be
109          * within a tighter range than GFP_DMA..
110          */
111         if (mask < 0x00ffffff)
112                 return 0;
113
114         return 1;
115 }
116
117 static inline
118 int dma_set_mask(struct device *dev, u64 mask)
119 {
120         if (!dev->dma_mask || !dma_supported(dev, mask))
121                 return -EIO;
122
123         *dev->dma_mask = mask;
124
125         return 0;
126 }
127
128 static inline
129 int dma_get_cache_alignment(void)
130 {
131         return 1 << L1_CACHE_SHIFT;
132 }
133
134 #define dma_is_consistent(d, h) (1)
135
136 static inline
137 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
138                     enum dma_data_direction direction)
139 {
140         flush_write_buffers();
141 }
142
143 #endif  /* _ASM_DMA_MAPPING_H */