Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[sfrench/cifs-2.6.git] / arch / cris / include / asm / dma-mapping.h
1 /* DMA mapping. Nothing tricky here, just virt_to_phys */
2
3 #ifndef _ASM_CRIS_DMA_MAPPING_H
4 #define _ASM_CRIS_DMA_MAPPING_H
5
6 #include <linux/mm.h>
7 #include <linux/kernel.h>
8
9 #include <asm/cache.h>
10 #include <asm/io.h>
11 #include <asm/scatterlist.h>
12
13 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
14 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
15
16 #ifdef CONFIG_PCI
17 #include <asm-generic/dma-coherent.h>
18
19 void *dma_alloc_coherent(struct device *dev, size_t size,
20                            dma_addr_t *dma_handle, gfp_t flag);
21
22 void dma_free_coherent(struct device *dev, size_t size,
23                          void *vaddr, dma_addr_t dma_handle);
24 #else
25 static inline void *
26 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
27                    gfp_t flag)
28 {
29         BUG();
30         return NULL;
31 }
32
33 static inline void
34 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
35                     dma_addr_t dma_handle)
36 {
37         BUG();
38 }
39 #endif
40 static inline dma_addr_t
41 dma_map_single(struct device *dev, void *ptr, size_t size,
42                enum dma_data_direction direction)
43 {
44         BUG_ON(direction == DMA_NONE);
45         return virt_to_phys(ptr);
46 }
47
48 static inline void
49 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
50                  enum dma_data_direction direction)
51 {
52         BUG_ON(direction == DMA_NONE);
53 }
54
55 static inline int
56 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
57            enum dma_data_direction direction)
58 {
59         printk("Map sg\n");
60         return nents;
61 }
62
63 static inline dma_addr_t
64 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
65              size_t size, enum dma_data_direction direction)
66 {
67         BUG_ON(direction == DMA_NONE);
68         return page_to_phys(page) + offset;
69 }
70
71 static inline void
72 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
73                enum dma_data_direction direction)
74 {
75         BUG_ON(direction == DMA_NONE);
76 }
77
78
79 static inline void
80 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
81              enum dma_data_direction direction)
82 {
83         BUG_ON(direction == DMA_NONE);
84 }
85
86 static inline void
87 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
88                         enum dma_data_direction direction)
89 {
90 }
91
92 static inline void
93 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
94                         enum dma_data_direction direction)
95 {
96 }
97
98 static inline void
99 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
100                               unsigned long offset, size_t size,
101                               enum dma_data_direction direction)
102 {
103 }
104
105 static inline void
106 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
107                                  unsigned long offset, size_t size,
108                                  enum dma_data_direction direction)
109 {
110 }
111
112 static inline void
113 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
114                     enum dma_data_direction direction)
115 {
116 }
117
118 static inline void
119 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
120                     enum dma_data_direction direction)
121 {
122 }
123
124 static inline int
125 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
126 {
127         return 0;
128 }
129
130 static inline int
131 dma_supported(struct device *dev, u64 mask)
132 {
133         /*
134          * we fall back to GFP_DMA when the mask isn't all 1s,
135          * so we can't guarantee allocations that must be
136          * within a tighter range than GFP_DMA..
137          */
138         if(mask < 0x00ffffff)
139                 return 0;
140
141         return 1;
142 }
143
144 static inline int
145 dma_set_mask(struct device *dev, u64 mask)
146 {
147         if(!dev->dma_mask || !dma_supported(dev, mask))
148                 return -EIO;
149
150         *dev->dma_mask = mask;
151
152         return 0;
153 }
154
155 static inline void
156 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
157                enum dma_data_direction direction)
158 {
159 }
160
161
162 #endif