Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched
[linux-2.6] / include / asm-xtensa / dma-mapping.h
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,
31                            dma_addr_t *dma_handle, gfp_t flag);
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, h) (1)
174
175 static inline void
176 dma_cache_sync(struct device *dev, 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 */