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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 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) | |
11 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) | |
12 | ||
13 | extern unsigned long __nongprelbss dma_coherent_mem_start; | |
14 | extern unsigned long __nongprelbss dma_coherent_mem_end; | |
15 | ||
a5da7d3c | 16 | void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp); |
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17 | void dma_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle); |
18 | ||
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19 | /* |
20 | * Map a single buffer of the indicated size for DMA in streaming mode. | |
21 | * The 32-bit bus address to use is returned. | |
22 | * | |
23 | * Once the device is given the dma address, the device owns this memory | |
24 | * until either pci_unmap_single or pci_dma_sync_single is performed. | |
25 | */ | |
26 | extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, | |
27 | enum dma_data_direction direction); | |
28 | ||
29 | /* | |
30 | * Unmap a single streaming mode DMA translation. The dma_addr and size | |
31 | * must match what was provided for in a previous pci_map_single call. All | |
32 | * other usages are undefined. | |
33 | * | |
34 | * After this call, reads by the cpu to the buffer are guarenteed to see | |
35 | * whatever the device wrote there. | |
36 | */ | |
37 | static inline | |
38 | void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, | |
39 | enum dma_data_direction direction) | |
40 | { | |
41 | BUG_ON(direction == DMA_NONE); | |
42 | } | |
43 | ||
44 | /* | |
45 | * Map a set of buffers described by scatterlist in streaming | |
46 | * mode for DMA. This is the scather-gather version of the | |
47 | * above pci_map_single interface. Here the scatter gather list | |
48 | * elements are each tagged with the appropriate dma address | |
49 | * and length. They are obtained via sg_dma_{address,length}(SG). | |
50 | * | |
51 | * NOTE: An implementation may be able to use a smaller number of | |
52 | * DMA address/length pairs than there are SG table elements. | |
53 | * (for example via virtual mapping capabilities) | |
54 | * The routine returns the number of addr/length pairs actually | |
55 | * used, at most nents. | |
56 | * | |
57 | * Device ownership issues as mentioned above for pci_map_single are | |
58 | * the same here. | |
59 | */ | |
60 | extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, | |
61 | enum dma_data_direction direction); | |
62 | ||
63 | /* | |
64 | * Unmap a set of streaming mode DMA translations. | |
65 | * Again, cpu read rules concerning calls here are the same as for | |
66 | * pci_unmap_single() above. | |
67 | */ | |
68 | static inline | |
69 | void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, | |
70 | enum dma_data_direction direction) | |
71 | { | |
72 | BUG_ON(direction == DMA_NONE); | |
73 | } | |
74 | ||
75 | extern | |
76 | dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, | |
77 | size_t size, enum dma_data_direction direction); | |
78 | ||
79 | static inline | |
80 | void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, | |
81 | enum dma_data_direction direction) | |
82 | { | |
83 | BUG_ON(direction == DMA_NONE); | |
84 | } | |
85 | ||
86 | ||
87 | static inline | |
88 | void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, | |
89 | enum dma_data_direction direction) | |
90 | { | |
91 | } | |
92 | ||
93 | static inline | |
94 | void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, | |
95 | enum dma_data_direction direction) | |
96 | { | |
97 | flush_write_buffers(); | |
98 | } | |
99 | ||
100 | static inline | |
101 | void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, | |
102 | unsigned long offset, size_t size, | |
103 | enum dma_data_direction direction) | |
104 | { | |
105 | } | |
106 | ||
107 | static inline | |
108 | void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, | |
109 | unsigned long offset, size_t size, | |
110 | enum dma_data_direction direction) | |
111 | { | |
112 | flush_write_buffers(); | |
113 | } | |
114 | ||
115 | static inline | |
116 | void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, | |
117 | enum dma_data_direction direction) | |
118 | { | |
119 | } | |
120 | ||
121 | static inline | |
122 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, | |
123 | enum dma_data_direction direction) | |
124 | { | |
125 | flush_write_buffers(); | |
126 | } | |
127 | ||
128 | static inline | |
8d8bb39b | 129 | int dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
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130 | { |
131 | return 0; | |
132 | } | |
133 | ||
134 | static inline | |
135 | int dma_supported(struct device *dev, u64 mask) | |
136 | { | |
137 | /* | |
138 | * we fall back to GFP_DMA when the mask isn't all 1s, | |
139 | * so we can't guarantee allocations that must be | |
140 | * within a tighter range than GFP_DMA.. | |
141 | */ | |
142 | if (mask < 0x00ffffff) | |
143 | return 0; | |
144 | ||
145 | return 1; | |
146 | } | |
147 | ||
148 | static inline | |
149 | int dma_set_mask(struct device *dev, u64 mask) | |
150 | { | |
151 | if (!dev->dma_mask || !dma_supported(dev, mask)) | |
152 | return -EIO; | |
153 | ||
154 | *dev->dma_mask = mask; | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static inline | |
160 | int dma_get_cache_alignment(void) | |
161 | { | |
162 | return 1 << L1_CACHE_SHIFT; | |
163 | } | |
164 | ||
f67637ee | 165 | #define dma_is_consistent(d, h) (1) |
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166 | |
167 | static inline | |
d3fa72e4 | 168 | void dma_cache_sync(struct device *dev, void *vaddr, size_t size, |
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169 | enum dma_data_direction direction) |
170 | { | |
171 | flush_write_buffers(); | |
172 | } | |
173 | ||
174 | #endif /* _ASM_DMA_MAPPING_H */ |