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_coherent
)(struct device
*dev
, size_t size
,
13 dma_addr_t
*dma_handle
, gfp_t gfp
);
14 void (*free_coherent
)(struct device
*dev
, size_t size
,
15 void *vaddr
, dma_addr_t dma_handle
);
16 dma_addr_t (*map_page
)(struct device
*dev
, struct page
*page
,
17 unsigned long offset
, size_t size
,
18 enum dma_data_direction dir
,
19 struct dma_attrs
*attrs
);
20 void (*unmap_page
)(struct device
*dev
, dma_addr_t dma_handle
,
21 size_t size
, enum dma_data_direction dir
,
22 struct dma_attrs
*attrs
);
23 int (*map_sg
)(struct device
*dev
, struct scatterlist
*sg
,
24 int nents
, enum dma_data_direction dir
,
25 struct dma_attrs
*attrs
);
26 void (*unmap_sg
)(struct device
*dev
,
27 struct scatterlist
*sg
, int nents
,
28 enum dma_data_direction dir
,
29 struct dma_attrs
*attrs
);
30 void (*sync_single_for_cpu
)(struct device
*dev
,
31 dma_addr_t dma_handle
, size_t size
,
32 enum dma_data_direction dir
);
33 void (*sync_single_for_device
)(struct device
*dev
,
34 dma_addr_t dma_handle
, size_t size
,
35 enum dma_data_direction dir
);
36 void (*sync_sg_for_cpu
)(struct device
*dev
,
37 struct scatterlist
*sg
, int nents
,
38 enum dma_data_direction dir
);
39 void (*sync_sg_for_device
)(struct device
*dev
,
40 struct scatterlist
*sg
, int nents
,
41 enum dma_data_direction dir
);
42 int (*mapping_error
)(struct device
*dev
, dma_addr_t dma_addr
);
43 int (*dma_supported
)(struct device
*dev
, u64 mask
);
44 int (*set_dma_mask
)(struct device
*dev
, u64 mask
);
45 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
46 u64 (*get_required_mask
)(struct device
*dev
);
51 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
53 #define DMA_MASK_NONE 0x0ULL
55 static inline int valid_dma_direction(int dma_direction
)
57 return ((dma_direction
== DMA_BIDIRECTIONAL
) ||
58 (dma_direction
== DMA_TO_DEVICE
) ||
59 (dma_direction
== DMA_FROM_DEVICE
));
62 static inline int is_device_dma_capable(struct device
*dev
)
64 return dev
->dma_mask
!= NULL
&& *dev
->dma_mask
!= DMA_MASK_NONE
;
68 #include <asm/dma-mapping.h>
70 #include <asm-generic/dma-mapping-broken.h>
73 static inline u64
dma_get_mask(struct device
*dev
)
75 if (dev
&& dev
->dma_mask
&& *dev
->dma_mask
)
76 return *dev
->dma_mask
;
77 return DMA_BIT_MASK(32);
80 #ifdef ARCH_HAS_DMA_SET_COHERENT_MASK
81 int dma_set_coherent_mask(struct device
*dev
, u64 mask
);
83 static inline int dma_set_coherent_mask(struct device
*dev
, u64 mask
)
85 if (!dma_supported(dev
, mask
))
87 dev
->coherent_dma_mask
= mask
;
92 extern u64
dma_get_required_mask(struct device
*dev
);
94 static inline unsigned int dma_get_max_seg_size(struct device
*dev
)
96 return dev
->dma_parms
? dev
->dma_parms
->max_segment_size
: 65536;
99 static inline unsigned int dma_set_max_seg_size(struct device
*dev
,
102 if (dev
->dma_parms
) {
103 dev
->dma_parms
->max_segment_size
= size
;
109 static inline unsigned long dma_get_seg_boundary(struct device
*dev
)
111 return dev
->dma_parms
?
112 dev
->dma_parms
->segment_boundary_mask
: 0xffffffff;
115 static inline int dma_set_seg_boundary(struct device
*dev
, unsigned long mask
)
117 if (dev
->dma_parms
) {
118 dev
->dma_parms
->segment_boundary_mask
= mask
;
124 static inline void *dma_zalloc_coherent(struct device
*dev
, size_t size
,
125 dma_addr_t
*dma_handle
, gfp_t flag
)
127 void *ret
= dma_alloc_coherent(dev
, size
, dma_handle
, flag
);
129 memset(ret
, 0, size
);
133 #ifdef CONFIG_HAS_DMA
134 static inline int dma_get_cache_alignment(void)
136 #ifdef ARCH_DMA_MINALIGN
137 return ARCH_DMA_MINALIGN
;
143 /* flags for the coherent memory api */
144 #define DMA_MEMORY_MAP 0x01
145 #define DMA_MEMORY_IO 0x02
146 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
147 #define DMA_MEMORY_EXCLUSIVE 0x08
149 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
151 dma_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
152 dma_addr_t device_addr
, size_t size
, int flags
)
158 dma_release_declared_memory(struct device
*dev
)
163 dma_mark_declared_memory_occupied(struct device
*dev
,
164 dma_addr_t device_addr
, size_t size
)
166 return ERR_PTR(-EBUSY
);
173 extern void *dmam_alloc_coherent(struct device
*dev
, size_t size
,
174 dma_addr_t
*dma_handle
, gfp_t gfp
);
175 extern void dmam_free_coherent(struct device
*dev
, size_t size
, void *vaddr
,
176 dma_addr_t dma_handle
);
177 extern void *dmam_alloc_noncoherent(struct device
*dev
, size_t size
,
178 dma_addr_t
*dma_handle
, gfp_t gfp
);
179 extern void dmam_free_noncoherent(struct device
*dev
, size_t size
, void *vaddr
,
180 dma_addr_t dma_handle
);
181 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
182 extern int dmam_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
183 dma_addr_t device_addr
, size_t size
,
185 extern void dmam_release_declared_memory(struct device
*dev
);
186 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
187 static inline int dmam_declare_coherent_memory(struct device
*dev
,
188 dma_addr_t bus_addr
, dma_addr_t device_addr
,
189 size_t size
, gfp_t gfp
)
194 static inline void dmam_release_declared_memory(struct device
*dev
)
197 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
199 #ifndef CONFIG_HAVE_DMA_ATTRS
202 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
203 dma_map_single(dev, cpu_addr, size, dir)
205 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
206 dma_unmap_single(dev, dma_addr, size, dir)
208 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
209 dma_map_sg(dev, sgl, nents, dir)
211 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
212 dma_unmap_sg(dev, sgl, nents, dir)
214 #endif /* CONFIG_HAVE_DMA_ATTRS */
216 #ifdef CONFIG_NEED_DMA_MAP_STATE
217 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
218 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
219 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
220 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
221 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
222 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
224 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
225 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
226 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
227 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
228 #define dma_unmap_len(PTR, LEN_NAME) (0)
229 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
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