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 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
);
21 int (*get_sgtable
)(struct device
*dev
, struct sg_table
*sgt
, void *,
22 dma_addr_t
, size_t, struct dma_attrs
*attrs
);
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
);
59 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
61 #define DMA_MASK_NONE 0x0ULL
63 static inline int valid_dma_direction(int dma_direction
)
65 return ((dma_direction
== DMA_BIDIRECTIONAL
) ||
66 (dma_direction
== DMA_TO_DEVICE
) ||
67 (dma_direction
== DMA_FROM_DEVICE
));
70 static inline int is_device_dma_capable(struct device
*dev
)
72 return dev
->dma_mask
!= NULL
&& *dev
->dma_mask
!= DMA_MASK_NONE
;
76 #include <asm/dma-mapping.h>
78 #include <asm-generic/dma-mapping-broken.h>
81 static inline u64
dma_get_mask(struct device
*dev
)
83 if (dev
&& dev
->dma_mask
&& *dev
->dma_mask
)
84 return *dev
->dma_mask
;
85 return DMA_BIT_MASK(32);
88 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
89 int dma_set_coherent_mask(struct device
*dev
, u64 mask
);
91 static inline int dma_set_coherent_mask(struct device
*dev
, u64 mask
)
93 if (!dma_supported(dev
, mask
))
95 dev
->coherent_dma_mask
= mask
;
101 * Set both the DMA mask and the coherent DMA mask to the same thing.
102 * Note that we don't check the return value from dma_set_coherent_mask()
103 * as the DMA API guarantees that the coherent DMA mask can be set to
104 * the same or smaller than the streaming DMA mask.
106 static inline int dma_set_mask_and_coherent(struct device
*dev
, u64 mask
)
108 int rc
= dma_set_mask(dev
, mask
);
110 dma_set_coherent_mask(dev
, mask
);
115 * Similar to the above, except it deals with the case where the device
116 * does not have dev->dma_mask appropriately setup.
118 static inline int dma_coerce_mask_and_coherent(struct device
*dev
, u64 mask
)
120 dev
->dma_mask
= &dev
->coherent_dma_mask
;
121 return dma_set_mask_and_coherent(dev
, mask
);
124 extern u64
dma_get_required_mask(struct device
*dev
);
126 static inline unsigned int dma_get_max_seg_size(struct device
*dev
)
128 return dev
->dma_parms
? dev
->dma_parms
->max_segment_size
: 65536;
131 static inline unsigned int dma_set_max_seg_size(struct device
*dev
,
134 if (dev
->dma_parms
) {
135 dev
->dma_parms
->max_segment_size
= size
;
141 static inline unsigned long dma_get_seg_boundary(struct device
*dev
)
143 return dev
->dma_parms
?
144 dev
->dma_parms
->segment_boundary_mask
: 0xffffffff;
147 static inline int dma_set_seg_boundary(struct device
*dev
, unsigned long mask
)
149 if (dev
->dma_parms
) {
150 dev
->dma_parms
->segment_boundary_mask
= mask
;
157 static inline unsigned long dma_max_pfn(struct device
*dev
)
159 return *dev
->dma_mask
>> PAGE_SHIFT
;
163 static inline void *dma_zalloc_coherent(struct device
*dev
, size_t size
,
164 dma_addr_t
*dma_handle
, gfp_t flag
)
166 void *ret
= dma_alloc_coherent(dev
, size
, dma_handle
,
171 #ifdef CONFIG_HAS_DMA
172 static inline int dma_get_cache_alignment(void)
174 #ifdef ARCH_DMA_MINALIGN
175 return ARCH_DMA_MINALIGN
;
181 /* flags for the coherent memory api */
182 #define DMA_MEMORY_MAP 0x01
183 #define DMA_MEMORY_IO 0x02
184 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
185 #define DMA_MEMORY_EXCLUSIVE 0x08
187 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
189 dma_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
190 dma_addr_t device_addr
, size_t size
, int flags
)
196 dma_release_declared_memory(struct device
*dev
)
201 dma_mark_declared_memory_occupied(struct device
*dev
,
202 dma_addr_t device_addr
, size_t size
)
204 return ERR_PTR(-EBUSY
);
211 extern void *dmam_alloc_coherent(struct device
*dev
, size_t size
,
212 dma_addr_t
*dma_handle
, gfp_t gfp
);
213 extern void dmam_free_coherent(struct device
*dev
, size_t size
, void *vaddr
,
214 dma_addr_t dma_handle
);
215 extern void *dmam_alloc_noncoherent(struct device
*dev
, size_t size
,
216 dma_addr_t
*dma_handle
, gfp_t gfp
);
217 extern void dmam_free_noncoherent(struct device
*dev
, size_t size
, void *vaddr
,
218 dma_addr_t dma_handle
);
219 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
220 extern int dmam_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
221 dma_addr_t device_addr
, size_t size
,
223 extern void dmam_release_declared_memory(struct device
*dev
);
224 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
225 static inline int dmam_declare_coherent_memory(struct device
*dev
,
226 dma_addr_t bus_addr
, dma_addr_t device_addr
,
227 size_t size
, gfp_t gfp
)
232 static inline void dmam_release_declared_memory(struct device
*dev
)
235 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
237 #ifndef CONFIG_HAVE_DMA_ATTRS
240 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
241 dma_map_single(dev, cpu_addr, size, dir)
243 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
244 dma_unmap_single(dev, dma_addr, size, dir)
246 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
247 dma_map_sg(dev, sgl, nents, dir)
249 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
250 dma_unmap_sg(dev, sgl, nents, dir)
252 #endif /* CONFIG_HAVE_DMA_ATTRS */
254 #ifdef CONFIG_NEED_DMA_MAP_STATE
255 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
256 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
257 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
258 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
259 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
260 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
262 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
263 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
264 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
265 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
266 #define dma_unmap_len(PTR, LEN_NAME) (0)
267 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
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