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96532bab RD |
1 | #ifndef _LINUX_DMA_MAPPING_H |
2 | #define _LINUX_DMA_MAPPING_H | |
1da177e4 LT |
3 | |
4 | #include <linux/device.h> | |
5 | #include <linux/err.h> | |
6 | ||
7 | /* These definitions mirror those in pci.h, so they can be used | |
8 | * interchangeably with their PCI_ counterparts */ | |
9 | enum dma_data_direction { | |
10 | DMA_BIDIRECTIONAL = 0, | |
11 | DMA_TO_DEVICE = 1, | |
12 | DMA_FROM_DEVICE = 2, | |
13 | DMA_NONE = 3, | |
14 | }; | |
15 | ||
8f286c33 | 16 | #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) |
34c65384 | 17 | |
8f286c33 AM |
18 | /* |
19 | * NOTE: do not use the below macros in new code and do not add new definitions | |
20 | * here. | |
21 | * | |
22 | * Instead, just open-code DMA_BIT_MASK(n) within your driver | |
23 | */ | |
24 | #define DMA_64BIT_MASK DMA_BIT_MASK(64) | |
34c65384 BP |
25 | #define DMA_48BIT_MASK DMA_BIT_MASK(48) |
26 | #define DMA_47BIT_MASK DMA_BIT_MASK(47) | |
27 | #define DMA_40BIT_MASK DMA_BIT_MASK(40) | |
28 | #define DMA_39BIT_MASK DMA_BIT_MASK(39) | |
29 | #define DMA_35BIT_MASK DMA_BIT_MASK(35) | |
30 | #define DMA_32BIT_MASK DMA_BIT_MASK(32) | |
31 | #define DMA_31BIT_MASK DMA_BIT_MASK(31) | |
32 | #define DMA_30BIT_MASK DMA_BIT_MASK(30) | |
33 | #define DMA_29BIT_MASK DMA_BIT_MASK(29) | |
34 | #define DMA_28BIT_MASK DMA_BIT_MASK(28) | |
35 | #define DMA_24BIT_MASK DMA_BIT_MASK(24) | |
1da177e4 | 36 | |
32e8f702 JB |
37 | #define DMA_MASK_NONE 0x0ULL |
38 | ||
d6bd3a39 REB |
39 | static inline int valid_dma_direction(int dma_direction) |
40 | { | |
41 | return ((dma_direction == DMA_BIDIRECTIONAL) || | |
42 | (dma_direction == DMA_TO_DEVICE) || | |
43 | (dma_direction == DMA_FROM_DEVICE)); | |
44 | } | |
45 | ||
32e8f702 JB |
46 | static inline int is_device_dma_capable(struct device *dev) |
47 | { | |
48 | return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; | |
49 | } | |
50 | ||
636dc67c FT |
51 | static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size) |
52 | { | |
53 | return addr + size <= mask; | |
54 | } | |
55 | ||
1b0fac45 | 56 | #ifdef CONFIG_HAS_DMA |
1da177e4 | 57 | #include <asm/dma-mapping.h> |
1b0fac45 DW |
58 | #else |
59 | #include <asm-generic/dma-mapping-broken.h> | |
60 | #endif | |
1da177e4 LT |
61 | |
62 | /* Backwards compat, remove in 2.7.x */ | |
63 | #define dma_sync_single dma_sync_single_for_cpu | |
64 | #define dma_sync_sg dma_sync_sg_for_cpu | |
65 | ||
66 | extern u64 dma_get_required_mask(struct device *dev); | |
67 | ||
6b7b6510 FT |
68 | static inline unsigned int dma_get_max_seg_size(struct device *dev) |
69 | { | |
70 | return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536; | |
71 | } | |
72 | ||
73 | static inline unsigned int dma_set_max_seg_size(struct device *dev, | |
74 | unsigned int size) | |
75 | { | |
76 | if (dev->dma_parms) { | |
77 | dev->dma_parms->max_segment_size = size; | |
78 | return 0; | |
79 | } else | |
80 | return -EIO; | |
81 | } | |
82 | ||
d22a6966 FT |
83 | static inline unsigned long dma_get_seg_boundary(struct device *dev) |
84 | { | |
85 | return dev->dma_parms ? | |
86 | dev->dma_parms->segment_boundary_mask : 0xffffffff; | |
87 | } | |
88 | ||
89 | static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) | |
90 | { | |
91 | if (dev->dma_parms) { | |
92 | dev->dma_parms->segment_boundary_mask = mask; | |
93 | return 0; | |
94 | } else | |
95 | return -EIO; | |
96 | } | |
97 | ||
1da177e4 LT |
98 | /* flags for the coherent memory api */ |
99 | #define DMA_MEMORY_MAP 0x01 | |
100 | #define DMA_MEMORY_IO 0x02 | |
101 | #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 | |
102 | #define DMA_MEMORY_EXCLUSIVE 0x08 | |
103 | ||
104 | #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY | |
105 | static inline int | |
106 | dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, | |
107 | dma_addr_t device_addr, size_t size, int flags) | |
108 | { | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static inline void | |
113 | dma_release_declared_memory(struct device *dev) | |
114 | { | |
115 | } | |
116 | ||
117 | static inline void * | |
118 | dma_mark_declared_memory_occupied(struct device *dev, | |
119 | dma_addr_t device_addr, size_t size) | |
120 | { | |
121 | return ERR_PTR(-EBUSY); | |
122 | } | |
123 | #endif | |
124 | ||
9ac7849e TH |
125 | /* |
126 | * Managed DMA API | |
127 | */ | |
128 | extern void *dmam_alloc_coherent(struct device *dev, size_t size, | |
129 | dma_addr_t *dma_handle, gfp_t gfp); | |
130 | extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, | |
131 | dma_addr_t dma_handle); | |
132 | extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, | |
133 | dma_addr_t *dma_handle, gfp_t gfp); | |
134 | extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, | |
135 | dma_addr_t dma_handle); | |
136 | #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY | |
137 | extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, | |
138 | dma_addr_t device_addr, size_t size, | |
139 | int flags); | |
140 | extern void dmam_release_declared_memory(struct device *dev); | |
141 | #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ | |
142 | static inline int dmam_declare_coherent_memory(struct device *dev, | |
143 | dma_addr_t bus_addr, dma_addr_t device_addr, | |
144 | size_t size, gfp_t gfp) | |
145 | { | |
146 | return 0; | |
147 | } | |
1da177e4 | 148 | |
9ac7849e TH |
149 | static inline void dmam_release_declared_memory(struct device *dev) |
150 | { | |
151 | } | |
152 | #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ | |
1da177e4 | 153 | |
74bc7cee AK |
154 | #ifndef CONFIG_HAVE_DMA_ATTRS |
155 | struct dma_attrs; | |
156 | ||
157 | #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \ | |
158 | dma_map_single(dev, cpu_addr, size, dir) | |
159 | ||
160 | #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ | |
161 | dma_unmap_single(dev, dma_addr, size, dir) | |
162 | ||
163 | #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ | |
164 | dma_map_sg(dev, sgl, nents, dir) | |
165 | ||
166 | #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ | |
167 | dma_unmap_sg(dev, sgl, nents, dir) | |
168 | ||
169 | #endif /* CONFIG_HAVE_DMA_ATTRS */ | |
170 | ||
9ac7849e | 171 | #endif |