tjh.dev
Linux kernel mirror (for testing)
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linux
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
25extern void *consistent_alloc(int, size_t, dma_addr_t, unsigned long);
26extern void consistent_free(void*, size_t, dma_addr_t);
27extern 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
32void *dma_alloc_coherent(struct device *dev, size_t size,
33 dma_addr_t *dma_handle, gfp_t flag);
34
35void dma_free_coherent(struct device *dev, size_t size,
36 void *vaddr, dma_addr_t dma_handle);
37
38static inline dma_addr_t
39dma_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
47static inline void
48dma_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
54static inline int
55dma_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
72static inline dma_addr_t
73dma_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
80static inline void
81dma_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
88static inline void
89dma_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
95static inline void
96dma_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
102static inline void
103dma_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
109static inline void
110dma_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
118static inline void
119dma_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}
126static inline void
127dma_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
135static inline void
136dma_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}
143static inline int
144dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
145{
146 return 0;
147}
148
149static inline int
150dma_supported(struct device *dev, u64 mask)
151{
152 return 1;
153}
154
155static inline int
156dma_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
166static inline void
167dma_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/* Not supported for now */
174static inline int dma_mmap_coherent(struct device *dev,
175 struct vm_area_struct *vma, void *cpu_addr,
176 dma_addr_t dma_addr, size_t size)
177{
178 return -EINVAL;
179}
180
181static inline int dma_get_sgtable(struct device *dev, struct sg_table *sgt,
182 void *cpu_addr, dma_addr_t dma_addr,
183 size_t size)
184{
185 return -EINVAL;
186}
187
188#endif /* _XTENSA_DMA_MAPPING_H */