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gerrit-public.fairphone.software / fp2-dev / kernel / msm / bb93e3a52f8db7210258a1a2134cced0b78a46e1 / . / include / asm-x86_64 / dma-mapping.h
blob: a416dc31634a207fa4ff3330810ef20dce2829c9 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1#ifndef _X8664_DMA_MAPPING_H
2#define _X8664_DMA_MAPPING_H 1
3
4/*
5 * IOMMU interface. See Documentation/DMA-mapping.txt and DMA-API.txt for
6 * documentation.
7 */
8
9#include <linux/config.h>
10
11#include <asm/scatterlist.h>
12#include <asm/io.h>
13#include <asm/swiotlb.h>
14
15extern dma_addr_t bad_dma_address;
16#define dma_mapping_error(x) \
17 (swiotlb ? swiotlb_dma_mapping_error(x) : ((x) == bad_dma_address))
18
19void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
20 unsigned gfp);
21void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
22 dma_addr_t dma_handle);
23
24#ifdef CONFIG_GART_IOMMU
25
26extern dma_addr_t dma_map_single(struct device *hwdev, void *ptr, size_t size,
27 int direction);
28extern void dma_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
29 int direction);
30
31#else
32
33/* No IOMMU */
34
35static inline dma_addr_t dma_map_single(struct device *hwdev, void *ptr,
36 size_t size, int direction)
37{
38 dma_addr_t addr;
39
40 if (direction == DMA_NONE)
41 out_of_line_bug();
42 addr = virt_to_bus(ptr);
43
44 if ((addr+size) & ~*hwdev->dma_mask)
45 out_of_line_bug();
46 return addr;
47}
48
49static inline void dma_unmap_single(struct device *hwdev, dma_addr_t dma_addr,
50 size_t size, int direction)
51{
52 if (direction == DMA_NONE)
53 out_of_line_bug();
54 /* Nothing to do */
55}
56
57#endif
58
59#define dma_map_page(dev,page,offset,size,dir) \
60 dma_map_single((dev), page_address(page)+(offset), (size), (dir))
61
62static inline void dma_sync_single_for_cpu(struct device *hwdev,
63 dma_addr_t dma_handle,
64 size_t size, int direction)
65{
66 if (direction == DMA_NONE)
67 out_of_line_bug();
68
69 if (swiotlb)
70 return swiotlb_sync_single_for_cpu(hwdev,dma_handle,size,direction);
71
72 flush_write_buffers();
73}
74
75static inline void dma_sync_single_for_device(struct device *hwdev,
76 dma_addr_t dma_handle,
77 size_t size, int direction)
78{
79 if (direction == DMA_NONE)
80 out_of_line_bug();
81
82 if (swiotlb)
83 return swiotlb_sync_single_for_device(hwdev,dma_handle,size,direction);
84
85 flush_write_buffers();
86}
87
88static inline void dma_sync_sg_for_cpu(struct device *hwdev,
89 struct scatterlist *sg,
90 int nelems, int direction)
91{
92 if (direction == DMA_NONE)
93 out_of_line_bug();
94
95 if (swiotlb)
96 return swiotlb_sync_sg_for_cpu(hwdev,sg,nelems,direction);
97
98 flush_write_buffers();
99}
100
101static inline void dma_sync_sg_for_device(struct device *hwdev,
102 struct scatterlist *sg,
103 int nelems, int direction)
104{
105 if (direction == DMA_NONE)
106 out_of_line_bug();
107
108 if (swiotlb)
109 return swiotlb_sync_sg_for_device(hwdev,sg,nelems,direction);
110
111 flush_write_buffers();
112}
113
114extern int dma_map_sg(struct device *hwdev, struct scatterlist *sg,
115 int nents, int direction);
116extern void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg,
117 int nents, int direction);
118
119#define dma_unmap_page dma_unmap_single
120
121extern int dma_supported(struct device *hwdev, u64 mask);
122extern int dma_get_cache_alignment(void);
123#define dma_is_consistent(h) 1
124
125static inline int dma_set_mask(struct device *dev, u64 mask)
126{
127 if (!dev->dma_mask || !dma_supported(dev, mask))
128 return -EIO;
129 *dev->dma_mask = mask;
130 return 0;
131}
132
133static inline void dma_cache_sync(void *vaddr, size_t size, enum dma_data_direction dir)
134{
135 flush_write_buffers();
136}
137
138#endif