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1 | /* |
2 | * include/asm-xtensa/dma_mapping.h | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 2003 - 2005 Tensilica Inc. | |
9 | */ | |
10 | ||
11 | #ifndef _XTENSA_DMA_MAPPING_H | |
12 | #define _XTENSA_DMA_MAPPING_H | |
13 | ||
14 | #include <asm/scatterlist.h> | |
15 | #include <asm/cache.h> | |
16 | #include <asm/io.h> | |
17 | #include <linux/mm.h> | |
18 | ||
19 | /* | |
20 | * DMA-consistent mapping functions. | |
21 | */ | |
22 | ||
23 | extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long); | |
24 | extern void consistent_free(void*, size_t, dma_addr_t); | |
25 | extern void consistent_sync(void*, size_t, int); | |
26 | ||
27 | #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f) | |
28 | #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h) | |
29 | ||
30 | void *dma_alloc_coherent(struct device *dev, size_t size, | |
5fb5cbed | 31 | dma_addr_t *dma_handle, gfp_t flag); |
9a8fd558 CZ |
32 | |
33 | void dma_free_coherent(struct device *dev, size_t size, | |
34 | void *vaddr, dma_addr_t dma_handle); | |
35 | ||
36 | static inline dma_addr_t | |
37 | dma_map_single(struct device *dev, void *ptr, size_t size, | |
38 | enum dma_data_direction direction) | |
39 | { | |
40 | BUG_ON(direction == DMA_NONE); | |
41 | consistent_sync(ptr, size, direction); | |
42 | return virt_to_phys(ptr); | |
43 | } | |
44 | ||
45 | static inline void | |
46 | dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, | |
47 | enum dma_data_direction direction) | |
48 | { | |
49 | BUG_ON(direction == DMA_NONE); | |
50 | } | |
51 | ||
52 | static inline int | |
53 | dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, | |
54 | enum dma_data_direction direction) | |
55 | { | |
56 | int i; | |
57 | ||
58 | BUG_ON(direction == DMA_NONE); | |
59 | ||
60 | for (i = 0; i < nents; i++, sg++ ) { | |
61 | BUG_ON(!sg->page); | |
62 | ||
63 | sg->dma_address = page_to_phys(sg->page) + sg->offset; | |
64 | consistent_sync(page_address(sg->page) + sg->offset, | |
65 | sg->length, direction); | |
66 | } | |
67 | ||
68 | return nents; | |
69 | } | |
70 | ||
71 | static inline dma_addr_t | |
72 | dma_map_page(struct device *dev, struct page *page, unsigned long offset, | |
73 | size_t size, enum dma_data_direction direction) | |
74 | { | |
75 | BUG_ON(direction == DMA_NONE); | |
76 | return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset; | |
77 | } | |
78 | ||
79 | static inline void | |
80 | 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 void | |
88 | dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, | |
89 | enum dma_data_direction direction) | |
90 | { | |
91 | BUG_ON(direction == DMA_NONE); | |
92 | } | |
93 | ||
94 | static inline void | |
95 | dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, | |
96 | enum dma_data_direction direction) | |
97 | { | |
98 | consistent_sync((void *)bus_to_virt(dma_handle), size, direction); | |
99 | } | |
100 | ||
101 | static inline void | |
102 | dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, | |
103 | enum dma_data_direction direction) | |
104 | { | |
105 | consistent_sync((void *)bus_to_virt(dma_handle), size, direction); | |
106 | } | |
107 | ||
108 | static inline void | |
109 | dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, | |
110 | unsigned long offset, size_t size, | |
111 | enum dma_data_direction direction) | |
112 | { | |
113 | ||
114 | consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction); | |
115 | } | |
116 | ||
117 | static inline void | |
118 | dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, | |
119 | unsigned long offset, size_t size, | |
120 | enum dma_data_direction direction) | |
121 | { | |
122 | ||
123 | consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction); | |
124 | } | |
125 | static inline void | |
126 | dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, | |
127 | enum dma_data_direction dir) | |
128 | { | |
129 | int i; | |
130 | for (i = 0; i < nelems; i++, sg++) | |
131 | consistent_sync(page_address(sg->page) + sg->offset, | |
132 | sg->length, dir); | |
133 | } | |
134 | ||
135 | static inline void | |
136 | dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, | |
137 | enum dma_data_direction dir) | |
138 | { | |
139 | int i; | |
140 | for (i = 0; i < nelems; i++, sg++) | |
141 | consistent_sync(page_address(sg->page) + sg->offset, | |
142 | sg->length, dir); | |
143 | } | |
144 | static inline int | |
145 | dma_mapping_error(dma_addr_t dma_addr) | |
146 | { | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static inline int | |
151 | dma_supported(struct device *dev, u64 mask) | |
152 | { | |
153 | return 1; | |
154 | } | |
155 | ||
156 | static inline int | |
157 | dma_set_mask(struct device *dev, u64 mask) | |
158 | { | |
159 | if(!dev->dma_mask || !dma_supported(dev, mask)) | |
160 | return -EIO; | |
161 | ||
162 | *dev->dma_mask = mask; | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static inline int | |
168 | dma_get_cache_alignment(void) | |
169 | { | |
170 | return L1_CACHE_BYTES; | |
171 | } | |
172 | ||
173 | #define dma_is_consistent(d) (1) | |
174 | ||
175 | static inline void | |
176 | dma_cache_sync(void *vaddr, size_t size, | |
177 | enum dma_data_direction direction) | |
178 | { | |
179 | consistent_sync(vaddr, size, direction); | |
180 | } | |
181 | ||
182 | #endif /* _XTENSA_DMA_MAPPING_H */ |