Line data Source code
1 : #ifndef _LINUX_DMA_MAPPING_H
2 : #define _LINUX_DMA_MAPPING_H
3 :
4 : #include <linux/device.h>
5 : #include <linux/err.h>
6 : #include <linux/dma-attrs.h>
7 : #include <linux/scatterlist.h>
8 :
9 : /* These definitions mirror those in pci.h, so they can be used
10 : * interchangeably with their PCI_ counterparts */
11 : enum dma_data_direction {
12 : DMA_BIDIRECTIONAL = 0,
13 : DMA_TO_DEVICE = 1,
14 : DMA_FROM_DEVICE = 2,
15 : DMA_NONE = 3,
16 : };
17 :
18 : struct dma_map_ops {
19 : void* (*alloc_coherent)(struct device *dev, size_t size,
20 : dma_addr_t *dma_handle, gfp_t gfp);
21 : void (*free_coherent)(struct device *dev, size_t size,
22 : void *vaddr, dma_addr_t dma_handle);
23 : dma_addr_t (*map_page)(struct device *dev, struct page *page,
24 : unsigned long offset, size_t size,
25 : enum dma_data_direction dir,
26 : struct dma_attrs *attrs);
27 : void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
28 : size_t size, enum dma_data_direction dir,
29 : struct dma_attrs *attrs);
30 : int (*map_sg)(struct device *dev, struct scatterlist *sg,
31 : int nents, enum dma_data_direction dir,
32 : struct dma_attrs *attrs);
33 : void (*unmap_sg)(struct device *dev,
34 : struct scatterlist *sg, int nents,
35 : enum dma_data_direction dir,
36 : struct dma_attrs *attrs);
37 : void (*sync_single_for_cpu)(struct device *dev,
38 : dma_addr_t dma_handle, size_t size,
39 : enum dma_data_direction dir);
40 : void (*sync_single_for_device)(struct device *dev,
41 : dma_addr_t dma_handle, size_t size,
42 : enum dma_data_direction dir);
43 : void (*sync_single_range_for_cpu)(struct device *dev,
44 : dma_addr_t dma_handle,
45 : unsigned long offset,
46 : size_t size,
47 : enum dma_data_direction dir);
48 : void (*sync_single_range_for_device)(struct device *dev,
49 : dma_addr_t dma_handle,
50 : unsigned long offset,
51 : size_t size,
52 : enum dma_data_direction dir);
53 : void (*sync_sg_for_cpu)(struct device *dev,
54 : struct scatterlist *sg, int nents,
55 : enum dma_data_direction dir);
56 : void (*sync_sg_for_device)(struct device *dev,
57 : struct scatterlist *sg, int nents,
58 : enum dma_data_direction dir);
59 : int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
60 : int (*dma_supported)(struct device *dev, u64 mask);
61 : int (*set_dma_mask)(struct device *dev, u64 mask);
62 : int is_phys;
63 : };
64 :
65 : #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
66 :
67 : typedef u64 DMA_nnBIT_MASK __deprecated;
68 :
69 : /*
70 : * NOTE: do not use the below macros in new code and do not add new definitions
71 : * here.
72 : *
73 : * Instead, just open-code DMA_BIT_MASK(n) within your driver
74 : */
75 : #define DMA_64BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(64)
76 : #define DMA_48BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(48)
77 : #define DMA_47BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(47)
78 : #define DMA_40BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(40)
79 : #define DMA_39BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(39)
80 : #define DMA_35BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(35)
81 : #define DMA_32BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(32)
82 : #define DMA_31BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(31)
83 : #define DMA_30BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(30)
84 : #define DMA_29BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(29)
85 : #define DMA_28BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(28)
86 : #define DMA_24BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(24)
87 :
88 : #define DMA_MASK_NONE 0x0ULL
89 :
90 : static inline int valid_dma_direction(int dma_direction)
91 : {
92 : return ((dma_direction == DMA_BIDIRECTIONAL) ||
93 : (dma_direction == DMA_TO_DEVICE) ||
94 : (dma_direction == DMA_FROM_DEVICE));
95 : }
96 :
97 : static inline int is_device_dma_capable(struct device *dev)
98 : {
99 7 : return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
100 : }
101 :
102 : #ifdef CONFIG_HAS_DMA
103 : #include <asm/dma-mapping.h>
104 : #else
105 : #include <asm-generic/dma-mapping-broken.h>
106 : #endif
107 :
108 : /* for backwards compatibility, removed soon */
109 : static inline void __deprecated dma_sync_single(struct device *dev,
110 : dma_addr_t addr, size_t size,
111 : enum dma_data_direction dir)
112 : {
113 : dma_sync_single_for_cpu(dev, addr, size, dir);
114 : }
115 :
116 : static inline void __deprecated dma_sync_sg(struct device *dev,
117 : struct scatterlist *sg, int nelems,
118 : enum dma_data_direction dir)
119 : {
120 : dma_sync_sg_for_cpu(dev, sg, nelems, dir);
121 : }
122 :
123 : static inline u64 dma_get_mask(struct device *dev)
124 : {
125 : if (dev && dev->dma_mask && *dev->dma_mask)
126 : return *dev->dma_mask;
127 : return DMA_BIT_MASK(32);
128 : }
129 :
130 : extern u64 dma_get_required_mask(struct device *dev);
131 :
132 : static inline unsigned int dma_get_max_seg_size(struct device *dev)
133 : {
134 : return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
135 : }
136 :
137 : static inline unsigned int dma_set_max_seg_size(struct device *dev,
138 : unsigned int size)
139 : {
140 : if (dev->dma_parms) {
141 : dev->dma_parms->max_segment_size = size;
142 : return 0;
143 : } else
144 : return -EIO;
145 : }
146 :
147 : static inline unsigned long dma_get_seg_boundary(struct device *dev)
148 : {
149 : return dev->dma_parms ?
150 : dev->dma_parms->segment_boundary_mask : 0xffffffff;
151 : }
152 :
153 : static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
154 : {
155 : if (dev->dma_parms) {
156 : dev->dma_parms->segment_boundary_mask = mask;
157 : return 0;
158 : } else
159 : return -EIO;
160 : }
161 :
162 : /* flags for the coherent memory api */
163 : #define DMA_MEMORY_MAP 0x01
164 : #define DMA_MEMORY_IO 0x02
165 : #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
166 : #define DMA_MEMORY_EXCLUSIVE 0x08
167 :
168 : #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
169 : static inline int
170 : dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
171 : dma_addr_t device_addr, size_t size, int flags)
172 : {
173 : return 0;
174 : }
175 :
176 : static inline void
177 : dma_release_declared_memory(struct device *dev)
178 : {
179 : }
180 :
181 : static inline void *
182 : dma_mark_declared_memory_occupied(struct device *dev,
183 : dma_addr_t device_addr, size_t size)
184 : {
185 : return ERR_PTR(-EBUSY);
186 : }
187 : #endif
188 :
189 : /*
190 : * Managed DMA API
191 : */
192 : extern void *dmam_alloc_coherent(struct device *dev, size_t size,
193 : dma_addr_t *dma_handle, gfp_t gfp);
194 : extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
195 : dma_addr_t dma_handle);
196 : extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
197 : dma_addr_t *dma_handle, gfp_t gfp);
198 : extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
199 : dma_addr_t dma_handle);
200 : #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
201 : extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
202 : dma_addr_t device_addr, size_t size,
203 : int flags);
204 : extern void dmam_release_declared_memory(struct device *dev);
205 : #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
206 : static inline int dmam_declare_coherent_memory(struct device *dev,
207 : dma_addr_t bus_addr, dma_addr_t device_addr,
208 : size_t size, gfp_t gfp)
209 : {
210 : return 0;
211 : }
212 :
213 : static inline void dmam_release_declared_memory(struct device *dev)
214 : {
215 : }
216 : #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
217 :
218 : #ifndef CONFIG_HAVE_DMA_ATTRS
219 : struct dma_attrs;
220 :
221 : #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
222 : dma_map_single(dev, cpu_addr, size, dir)
223 :
224 : #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
225 : dma_unmap_single(dev, dma_addr, size, dir)
226 :
227 : #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
228 : dma_map_sg(dev, sgl, nents, dir)
229 :
230 : #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
231 : dma_unmap_sg(dev, sgl, nents, dir)
232 :
233 : #endif /* CONFIG_HAVE_DMA_ATTRS */
234 :
235 : #endif
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