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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/cache.h>
15 #include <asm/io.h>
16 #include <linux/mm.h>
17 #include <linux/scatterlist.h>
18
19 #define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
20
21 /*
22  * DMA-consistent mapping functions.
23  */
24
25 extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long);
26 extern void consistent_free(void*, size_t, dma_addr_t);
27 extern void consistent_sync(void*, size_t, int);
28
29 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
30 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
31
32 void *dma_alloc_coherent(struct device *dev, size_t size,
33                            dma_addr_t *dma_handle, gfp_t flag);
34
35 void dma_free_coherent(struct device *dev, size_t size,
36                          void *vaddr, dma_addr_t dma_handle);
37
38 static inline dma_addr_t
39 dma_map_single(struct device *dev, void *ptr, size_t size,
40                enum dma_data_direction direction)
41 {
42         BUG_ON(direction == DMA_NONE);
43         consistent_sync(ptr, size, direction);
44         return virt_to_phys(ptr);
45 }
46
47 static inline void
48 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
49                  enum dma_data_direction direction)
50 {
51         BUG_ON(direction == DMA_NONE);
52 }
53
54 static inline int
55 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
56            enum dma_data_direction direction)
57 {
58         int i;
59
60         BUG_ON(direction == DMA_NONE);
61
62         for (i = 0; i < nents; i++, sg++ ) {
63                 BUG_ON(!sg_page(sg));
64
65                 sg->dma_address = sg_phys(sg);
66                 consistent_sync(sg_virt(sg), sg->length, direction);
67         }
68
69         return nents;
70 }
71
72 static inline dma_addr_t
73 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
74              size_t size, enum dma_data_direction direction)
75 {
76         BUG_ON(direction == DMA_NONE);
77         return (dma_addr_t)(page_to_pfn(page)) * PAGE_SIZE + offset;
78 }
79
80 static inline void
81 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
82                enum dma_data_direction direction)
83 {
84         BUG_ON(direction == DMA_NONE);
85 }
86
87
88 static inline void
89 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
90              enum dma_data_direction direction)
91 {
92         BUG_ON(direction == DMA_NONE);
93 }
94
95 static inline void
96 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
97                 enum dma_data_direction direction)
98 {
99         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
100 }
101
102 static inline void
103 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
104                            size_t size, enum dma_data_direction direction)
105 {
106         consistent_sync((void *)bus_to_virt(dma_handle), size, direction);
107 }
108
109 static inline void
110 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
111                       unsigned long offset, size_t size,
112                       enum dma_data_direction direction)
113 {
114
115         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
116 }
117
118 static inline void
119 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
120                       unsigned long offset, size_t size,
121                       enum dma_data_direction direction)
122 {
123
124         consistent_sync((void *)bus_to_virt(dma_handle)+offset,size,direction);
125 }
126 static inline void
127 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
128                  enum dma_data_direction dir)
129 {
130         int i;
131         for (i = 0; i < nelems; i++, sg++)
132                 consistent_sync(sg_virt(sg), 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(sg_virt(sg), sg->length, dir);
142 }
143 static inline int
144 dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
145 {
146         return 0;
147 }
148
149 static inline int
150 dma_supported(struct device *dev, u64 mask)
151 {
152         return 1;
153 }
154
155 static inline int
156 dma_set_mask(struct device *dev, u64 mask)
157 {
158         if(!dev->dma_mask || !dma_supported(dev, mask))
159                 return -EIO;
160
161         *dev->dma_mask = mask;
162
163         return 0;
164 }
165
166 static inline void
167 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
168                enum dma_data_direction direction)
169 {
170         consistent_sync(vaddr, size, direction);
171 }
172
173 #endif  /* _XTENSA_DMA_MAPPING_H */