tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* DMA mapping. Nothing tricky here, just virt_to_phys */
2
3#ifndef _ASM_CRIS_DMA_MAPPING_H
4#define _ASM_CRIS_DMA_MAPPING_H
5
6#include <linux/mm.h>
7#include <linux/kernel.h>
8#include <linux/scatterlist.h>
9
10#include <asm/cache.h>
11#include <asm/io.h>
12
13#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
14#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
15
16#ifdef CONFIG_PCI
17#include <asm-generic/dma-coherent.h>
18
19void *dma_alloc_coherent(struct device *dev, size_t size,
20 dma_addr_t *dma_handle, gfp_t flag);
21
22void dma_free_coherent(struct device *dev, size_t size,
23 void *vaddr, dma_addr_t dma_handle);
24#else
25static inline void *
26dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
27 gfp_t flag)
28{
29 BUG();
30 return NULL;
31}
32
33static inline void
34dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
35 dma_addr_t dma_handle)
36{
37 BUG();
38}
39#endif
40static inline dma_addr_t
41dma_map_single(struct device *dev, void *ptr, size_t size,
42 enum dma_data_direction direction)
43{
44 BUG_ON(direction == DMA_NONE);
45 return virt_to_phys(ptr);
46}
47
48static inline void
49dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
50 enum dma_data_direction direction)
51{
52 BUG_ON(direction == DMA_NONE);
53}
54
55static inline int
56dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
57 enum dma_data_direction direction)
58{
59 printk("Map sg\n");
60 return nents;
61}
62
63static inline dma_addr_t
64dma_map_page(struct device *dev, struct page *page, unsigned long offset,
65 size_t size, enum dma_data_direction direction)
66{
67 BUG_ON(direction == DMA_NONE);
68 return page_to_phys(page) + offset;
69}
70
71static inline void
72dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
73 enum dma_data_direction direction)
74{
75 BUG_ON(direction == DMA_NONE);
76}
77
78
79static inline void
80dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
81 enum dma_data_direction direction)
82{
83 BUG_ON(direction == DMA_NONE);
84}
85
86static inline void
87dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
88 enum dma_data_direction direction)
89{
90}
91
92static inline void
93dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
94 enum dma_data_direction direction)
95{
96}
97
98static inline void
99dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
100 unsigned long offset, size_t size,
101 enum dma_data_direction direction)
102{
103}
104
105static inline void
106dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
107 unsigned long offset, size_t size,
108 enum dma_data_direction direction)
109{
110}
111
112static inline void
113dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
114 enum dma_data_direction direction)
115{
116}
117
118static inline void
119dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
120 enum dma_data_direction direction)
121{
122}
123
124static inline int
125dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
126{
127 return 0;
128}
129
130static inline int
131dma_supported(struct device *dev, u64 mask)
132{
133 /*
134 * we fall back to GFP_DMA when the mask isn't all 1s,
135 * so we can't guarantee allocations that must be
136 * within a tighter range than GFP_DMA..
137 */
138 if(mask < 0x00ffffff)
139 return 0;
140
141 return 1;
142}
143
144static inline int
145dma_set_mask(struct device *dev, u64 mask)
146{
147 if(!dev->dma_mask || !dma_supported(dev, mask))
148 return -EIO;
149
150 *dev->dma_mask = mask;
151
152 return 0;
153}
154
155static inline void
156dma_cache_sync(struct device *dev, void *vaddr, size_t size,
157 enum dma_data_direction direction)
158{
159}
160
161/* drivers/base/dma-mapping.c */
162extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
163 void *cpu_addr, dma_addr_t dma_addr, size_t size);
164extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
165 void *cpu_addr, dma_addr_t dma_addr,
166 size_t size);
167
168#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
169#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
170
171
172#endif