1 #ifndef _LINUX_DMA_MAPPING_H
2 #define _LINUX_DMA_MAPPING_H
4 #include <linux/string.h>
5 #include <linux/device.h>
7 #include <linux/dma-attrs.h>
8 #include <linux/dma-direction.h>
9 #include <linux/scatterlist.h>
12 * A dma_addr_t can hold any valid DMA or bus address for the platform.
13 * It can be given to a device to use as a DMA source or target. A CPU cannot
14 * reference a dma_addr_t directly because there may be translation between
15 * its physical address space and the bus address space.
18 void* (*alloc
)(struct device
*dev
, size_t size
,
19 dma_addr_t
*dma_handle
, gfp_t gfp
,
20 struct dma_attrs
*attrs
);
21 void (*free
)(struct device
*dev
, size_t size
,
22 void *vaddr
, dma_addr_t dma_handle
,
23 struct dma_attrs
*attrs
);
24 int (*mmap
)(struct device
*, struct vm_area_struct
*,
25 void *, dma_addr_t
, size_t, struct dma_attrs
*attrs
);
27 int (*get_sgtable
)(struct device
*dev
, struct sg_table
*sgt
, void *,
28 dma_addr_t
, size_t, struct dma_attrs
*attrs
);
30 dma_addr_t (*map_page
)(struct device
*dev
, struct page
*page
,
31 unsigned long offset
, size_t size
,
32 enum dma_data_direction dir
,
33 struct dma_attrs
*attrs
);
34 void (*unmap_page
)(struct device
*dev
, dma_addr_t dma_handle
,
35 size_t size
, enum dma_data_direction dir
,
36 struct dma_attrs
*attrs
);
37 int (*map_sg
)(struct device
*dev
, struct scatterlist
*sg
,
38 int nents
, enum dma_data_direction dir
,
39 struct dma_attrs
*attrs
);
40 void (*unmap_sg
)(struct device
*dev
,
41 struct scatterlist
*sg
, int nents
,
42 enum dma_data_direction dir
,
43 struct dma_attrs
*attrs
);
44 void (*sync_single_for_cpu
)(struct device
*dev
,
45 dma_addr_t dma_handle
, size_t size
,
46 enum dma_data_direction dir
);
47 void (*sync_single_for_device
)(struct device
*dev
,
48 dma_addr_t dma_handle
, size_t size
,
49 enum dma_data_direction dir
);
50 void (*sync_sg_for_cpu
)(struct device
*dev
,
51 struct scatterlist
*sg
, int nents
,
52 enum dma_data_direction dir
);
53 void (*sync_sg_for_device
)(struct device
*dev
,
54 struct scatterlist
*sg
, int nents
,
55 enum dma_data_direction dir
);
56 int (*mapping_error
)(struct device
*dev
, dma_addr_t dma_addr
);
57 int (*dma_supported
)(struct device
*dev
, u64 mask
);
58 int (*set_dma_mask
)(struct device
*dev
, u64 mask
);
59 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
60 u64 (*get_required_mask
)(struct device
*dev
);
65 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
67 #define DMA_MASK_NONE 0x0ULL
69 static inline int valid_dma_direction(int dma_direction
)
71 return ((dma_direction
== DMA_BIDIRECTIONAL
) ||
72 (dma_direction
== DMA_TO_DEVICE
) ||
73 (dma_direction
== DMA_FROM_DEVICE
));
76 static inline int is_device_dma_capable(struct device
*dev
)
78 return dev
->dma_mask
!= NULL
&& *dev
->dma_mask
!= DMA_MASK_NONE
;
82 #include <asm/dma-mapping.h>
84 #include <asm-generic/dma-mapping-broken.h>
87 static inline u64
dma_get_mask(struct device
*dev
)
89 if (dev
&& dev
->dma_mask
&& *dev
->dma_mask
)
90 return *dev
->dma_mask
;
91 return DMA_BIT_MASK(32);
94 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
95 int dma_set_coherent_mask(struct device
*dev
, u64 mask
);
97 static inline int dma_set_coherent_mask(struct device
*dev
, u64 mask
)
99 if (!dma_supported(dev
, mask
))
101 dev
->coherent_dma_mask
= mask
;
107 * Set both the DMA mask and the coherent DMA mask to the same thing.
108 * Note that we don't check the return value from dma_set_coherent_mask()
109 * as the DMA API guarantees that the coherent DMA mask can be set to
110 * the same or smaller than the streaming DMA mask.
112 static inline int dma_set_mask_and_coherent(struct device
*dev
, u64 mask
)
114 int rc
= dma_set_mask(dev
, mask
);
116 dma_set_coherent_mask(dev
, mask
);
121 * Similar to the above, except it deals with the case where the device
122 * does not have dev->dma_mask appropriately setup.
124 static inline int dma_coerce_mask_and_coherent(struct device
*dev
, u64 mask
)
126 dev
->dma_mask
= &dev
->coherent_dma_mask
;
127 return dma_set_mask_and_coherent(dev
, mask
);
130 extern u64
dma_get_required_mask(struct device
*dev
);
132 #ifndef set_arch_dma_coherent_ops
133 static inline int set_arch_dma_coherent_ops(struct device
*dev
)
139 static inline unsigned int dma_get_max_seg_size(struct device
*dev
)
141 return dev
->dma_parms
? dev
->dma_parms
->max_segment_size
: 65536;
144 static inline unsigned int dma_set_max_seg_size(struct device
*dev
,
147 if (dev
->dma_parms
) {
148 dev
->dma_parms
->max_segment_size
= size
;
154 static inline unsigned long dma_get_seg_boundary(struct device
*dev
)
156 return dev
->dma_parms
?
157 dev
->dma_parms
->segment_boundary_mask
: 0xffffffff;
160 static inline int dma_set_seg_boundary(struct device
*dev
, unsigned long mask
)
162 if (dev
->dma_parms
) {
163 dev
->dma_parms
->segment_boundary_mask
= mask
;
170 static inline unsigned long dma_max_pfn(struct device
*dev
)
172 return *dev
->dma_mask
>> PAGE_SHIFT
;
176 static inline void *dma_zalloc_coherent(struct device
*dev
, size_t size
,
177 dma_addr_t
*dma_handle
, gfp_t flag
)
179 void *ret
= dma_alloc_coherent(dev
, size
, dma_handle
,
184 #ifdef CONFIG_HAS_DMA
185 static inline int dma_get_cache_alignment(void)
187 #ifdef ARCH_DMA_MINALIGN
188 return ARCH_DMA_MINALIGN
;
194 /* flags for the coherent memory api */
195 #define DMA_MEMORY_MAP 0x01
196 #define DMA_MEMORY_IO 0x02
197 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
198 #define DMA_MEMORY_EXCLUSIVE 0x08
200 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
202 dma_declare_coherent_memory(struct device
*dev
, phys_addr_t phys_addr
,
203 dma_addr_t device_addr
, size_t size
, int flags
)
209 dma_release_declared_memory(struct device
*dev
)
214 dma_mark_declared_memory_occupied(struct device
*dev
,
215 dma_addr_t device_addr
, size_t size
)
217 return ERR_PTR(-EBUSY
);
224 extern void *dmam_alloc_coherent(struct device
*dev
, size_t size
,
225 dma_addr_t
*dma_handle
, gfp_t gfp
);
226 extern void dmam_free_coherent(struct device
*dev
, size_t size
, void *vaddr
,
227 dma_addr_t dma_handle
);
228 extern void *dmam_alloc_noncoherent(struct device
*dev
, size_t size
,
229 dma_addr_t
*dma_handle
, gfp_t gfp
);
230 extern void dmam_free_noncoherent(struct device
*dev
, size_t size
, void *vaddr
,
231 dma_addr_t dma_handle
);
232 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
233 extern int dmam_declare_coherent_memory(struct device
*dev
,
234 phys_addr_t phys_addr
,
235 dma_addr_t device_addr
, size_t size
,
237 extern void dmam_release_declared_memory(struct device
*dev
);
238 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
239 static inline int dmam_declare_coherent_memory(struct device
*dev
,
240 phys_addr_t phys_addr
, dma_addr_t device_addr
,
241 size_t size
, gfp_t gfp
)
246 static inline void dmam_release_declared_memory(struct device
*dev
)
249 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
251 #ifndef CONFIG_HAVE_DMA_ATTRS
254 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
255 dma_map_single(dev, cpu_addr, size, dir)
257 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
258 dma_unmap_single(dev, dma_addr, size, dir)
260 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
261 dma_map_sg(dev, sgl, nents, dir)
263 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
264 dma_unmap_sg(dev, sgl, nents, dir)
267 static inline void *dma_alloc_writecombine(struct device
*dev
, size_t size
,
268 dma_addr_t
*dma_addr
, gfp_t gfp
)
270 DEFINE_DMA_ATTRS(attrs
);
271 dma_set_attr(DMA_ATTR_WRITE_COMBINE
, &attrs
);
272 return dma_alloc_attrs(dev
, size
, dma_addr
, gfp
, &attrs
);
275 static inline void dma_free_writecombine(struct device
*dev
, size_t size
,
276 void *cpu_addr
, dma_addr_t dma_addr
)
278 DEFINE_DMA_ATTRS(attrs
);
279 dma_set_attr(DMA_ATTR_WRITE_COMBINE
, &attrs
);
280 return dma_free_attrs(dev
, size
, cpu_addr
, dma_addr
, &attrs
);
283 static inline int dma_mmap_writecombine(struct device
*dev
,
284 struct vm_area_struct
*vma
,
285 void *cpu_addr
, dma_addr_t dma_addr
,
288 DEFINE_DMA_ATTRS(attrs
);
289 dma_set_attr(DMA_ATTR_WRITE_COMBINE
, &attrs
);
290 return dma_mmap_attrs(dev
, vma
, cpu_addr
, dma_addr
, size
, &attrs
);
292 #endif /* CONFIG_HAVE_DMA_ATTRS */
294 #ifdef CONFIG_NEED_DMA_MAP_STATE
295 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
296 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
297 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
298 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
299 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
300 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
302 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
303 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
304 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
305 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
306 #define dma_unmap_len(PTR, LEN_NAME) (0)
307 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)