1 #ifndef _LINUX_DMA_MAPPING_H
2 #define _LINUX_DMA_MAPPING_H
3
4 #include <linux/string.h>
5 #include <linux/device.h>
6 #include <linux/err.h>
7 #include <linux/dma-attrs.h>
8 #include <linux/dma-direction.h>
9 #include <linux/scatterlist.h>
10
11 struct dma_map_ops {
12 void* (*alloc)(struct device *dev, size_t size,
13 dma_addr_t *dma_handle, gfp_t gfp,
14 struct dma_attrs *attrs);
15 void (*free)(struct device *dev, size_t size,
16 void *vaddr, dma_addr_t dma_handle,
17 struct dma_attrs *attrs);
18 int (*mmap)(struct device *, struct vm_area_struct *,
19 void *, dma_addr_t, size_t, struct dma_attrs *attrs);
20
21 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
22 dma_addr_t, size_t, struct dma_attrs *attrs);
23
24 dma_addr_t (*map_page)(struct device *dev, struct page *page,
25 unsigned long offset, size_t size,
26 enum dma_data_direction dir,
27 struct dma_attrs *attrs);
28 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
29 size_t size, enum dma_data_direction dir,
30 struct dma_attrs *attrs);
31 int (*map_sg)(struct device *dev, struct scatterlist *sg,
32 int nents, enum dma_data_direction dir,
33 struct dma_attrs *attrs);
34 void (*unmap_sg)(struct device *dev,
35 struct scatterlist *sg, int nents,
36 enum dma_data_direction dir,
37 struct dma_attrs *attrs);
38 void (*sync_single_for_cpu)(struct device *dev,
39 dma_addr_t dma_handle, size_t size,
40 enum dma_data_direction dir);
41 void (*sync_single_for_device)(struct device *dev,
42 dma_addr_t dma_handle, size_t size,
43 enum dma_data_direction dir);
44 void (*sync_sg_for_cpu)(struct device *dev,
45 struct scatterlist *sg, int nents,
46 enum dma_data_direction dir);
47 void (*sync_sg_for_device)(struct device *dev,
48 struct scatterlist *sg, int nents,
49 enum dma_data_direction dir);
50 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
51 int (*dma_supported)(struct device *dev, u64 mask);
52 int (*set_dma_mask)(struct device *dev, u64 mask);
53 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
54 u64 (*get_required_mask)(struct device *dev);
55 #endif
56 int is_phys;
57 };
58
59 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
60
61 #define DMA_MASK_NONE 0x0ULL
62
63 static inline int valid_dma_direction(int dma_direction)
64 {
65 return ((dma_direction == DMA_BIDIRECTIONAL) ||
66 (dma_direction == DMA_TO_DEVICE) ||
67 (dma_direction == DMA_FROM_DEVICE));
68 }
69
70 static inline int is_device_dma_capable(struct device *dev)
71 {
72 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
73 }
74
75 #ifdef CONFIG_HAS_DMA
76 #include <asm/dma-mapping.h>
77 #else
78 #include <asm-generic/dma-mapping-broken.h>
79 #endif
80
81 static inline u64 dma_get_mask(struct device *dev)
82 {
83 if (dev && dev->dma_mask && *dev->dma_mask)
84 return *dev->dma_mask;
85 return DMA_BIT_MASK(32);
86 }
87
88 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
89 int dma_set_coherent_mask(struct device *dev, u64 mask);
90 #else
91 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
92 {
93 if (!dma_supported(dev, mask))
94 return -EIO;
95 dev->coherent_dma_mask = mask;
96 return 0;
97 }
98 #endif
99
100 extern u64 dma_get_required_mask(struct device *dev);
101
102 static inline unsigned int dma_get_max_seg_size(struct device *dev)
103 {
104 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
105 }
106
107 static inline unsigned int dma_set_max_seg_size(struct device *dev,
108 unsigned int size)
109 {
110 if (dev->dma_parms) {
111 dev->dma_parms->max_segment_size = size;
112 return 0;
113 } else
114 return -EIO;
115 }
116
117 static inline unsigned long dma_get_seg_boundary(struct device *dev)
118 {
119 return dev->dma_parms ?
120 dev->dma_parms->segment_boundary_mask : 0xffffffff;
121 }
122
123 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
124 {
125 if (dev->dma_parms) {
126 dev->dma_parms->segment_boundary_mask = mask;
127 return 0;
128 } else
129 return -EIO;
130 }
131
132 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
133 dma_addr_t *dma_handle, gfp_t flag)
134 {
135 void *ret = dma_alloc_coherent(dev, size, dma_handle, flag);
136 if (ret)
137 memset(ret, 0, size);
138 return ret;
139 }
140
141 #ifdef CONFIG_HAS_DMA
142 static inline int dma_get_cache_alignment(void)
143 {
144 #ifdef ARCH_DMA_MINALIGN
145 return ARCH_DMA_MINALIGN;
146 #endif
147 return 1;
148 }
149 #endif
150
151 /* flags for the coherent memory api */
152 #define DMA_MEMORY_MAP 0x01
153 #define DMA_MEMORY_IO 0x02
154 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
155 #define DMA_MEMORY_EXCLUSIVE 0x08
156
157 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
158 static inline int
159 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
160 dma_addr_t device_addr, size_t size, int flags)
161 {
162 return 0;
163 }
164
165 static inline void
166 dma_release_declared_memory(struct device *dev)
167 {
168 }
169
170 static inline void *
171 dma_mark_declared_memory_occupied(struct device *dev,
172 dma_addr_t device_addr, size_t size)
173 {
174 return ERR_PTR(-EBUSY);
175 }
176 #endif
177
178 /*
179 * Managed DMA API
180 */
181 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
182 dma_addr_t *dma_handle, gfp_t gfp);
183 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
184 dma_addr_t dma_handle);
185 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
186 dma_addr_t *dma_handle, gfp_t gfp);
187 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
188 dma_addr_t dma_handle);
189 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
190 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
191 dma_addr_t device_addr, size_t size,
192 int flags);
193 extern void dmam_release_declared_memory(struct device *dev);
194 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
195 static inline int dmam_declare_coherent_memory(struct device *dev,
196 dma_addr_t bus_addr, dma_addr_t device_addr,
197 size_t size, gfp_t gfp)
198 {
199 return 0;
200 }
201
202 static inline void dmam_release_declared_memory(struct device *dev)
203 {
204 }
205 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
206
207 #ifndef CONFIG_HAVE_DMA_ATTRS
208 struct dma_attrs;
209
210 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
211 dma_map_single(dev, cpu_addr, size, dir)
212
213 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
214 dma_unmap_single(dev, dma_addr, size, dir)
215
216 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
217 dma_map_sg(dev, sgl, nents, dir)
218
219 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
220 dma_unmap_sg(dev, sgl, nents, dir)
221
222 #endif /* CONFIG_HAVE_DMA_ATTRS */
223
224 #ifdef CONFIG_NEED_DMA_MAP_STATE
225 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
226 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
227 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
228 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
229 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
230 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
231 #else
232 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
233 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
234 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
235 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
236 #define dma_unmap_len(PTR, LEN_NAME) (0)
237 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
238 #endif
239
240 #endif
241
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