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 *
dma_alloc_coherent(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t flag)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
dma_free_coherent(struct device * dev,size_t size,void * cpu_addr,dma_addr_t dma_handle)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
dma_map_single(struct device * dev,void * ptr,size_t size,enum dma_data_direction direction)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
dma_unmap_single(struct device * dev,dma_addr_t dma_addr,size_t size,enum dma_data_direction direction)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
dma_map_sg(struct device * dev,struct scatterlist * sg,int nents,enum dma_data_direction direction)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
dma_map_page(struct device * dev,struct page * page,unsigned long offset,size_t size,enum dma_data_direction direction)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
dma_unmap_page(struct device * dev,dma_addr_t dma_address,size_t size,enum dma_data_direction direction)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
dma_unmap_sg(struct device * dev,struct scatterlist * sg,int nhwentries,enum dma_data_direction direction)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
dma_sync_single_for_cpu(struct device * dev,dma_addr_t dma_handle,size_t size,enum dma_data_direction direction)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
dma_sync_single_for_device(struct device * dev,dma_addr_t dma_handle,size_t size,enum dma_data_direction direction)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
dma_sync_single_range_for_cpu(struct device * dev,dma_addr_t dma_handle,unsigned long offset,size_t size,enum dma_data_direction direction)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
dma_sync_single_range_for_device(struct device * dev,dma_addr_t dma_handle,unsigned long offset,size_t size,enum dma_data_direction direction)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
dma_sync_sg_for_cpu(struct device * dev,struct scatterlist * sg,int nelems,enum dma_data_direction direction)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
dma_sync_sg_for_device(struct device * dev,struct scatterlist * sg,int nelems,enum dma_data_direction direction)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
dma_mapping_error(struct device * dev,dma_addr_t dma_addr)125 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
126 {
127 return 0;
128 }
129
130 static inline int
dma_supported(struct device * dev,u64 mask)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
dma_set_mask(struct device * dev,u64 mask)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
dma_cache_sync(struct device * dev,void * vaddr,size_t size,enum dma_data_direction direction)156 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
157 enum dma_data_direction direction)
158 {
159 }
160
161
162 #endif
163