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
);
48 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
50 #define DMA_MASK_NONE 0x0ULL
52 static inline int valid_dma_direction(int dma_direction
)
54 return ((dma_direction
== DMA_BIDIRECTIONAL
) ||
55 (dma_direction
== DMA_TO_DEVICE
) ||
56 (dma_direction
== DMA_FROM_DEVICE
));
59 static inline int is_device_dma_capable(struct device
*dev
)
61 return dev
->dma_mask
!= NULL
&& *dev
->dma_mask
!= DMA_MASK_NONE
;
65 #include <asm/dma-mapping.h>
67 #include <asm-generic/dma-mapping-broken.h>
70 static inline u64
dma_get_mask(struct device
*dev
)
72 if (dev
&& dev
->dma_mask
&& *dev
->dma_mask
)
73 return *dev
->dma_mask
;
74 return DMA_BIT_MASK(32);
77 #ifdef ARCH_HAS_DMA_SET_COHERENT_MASK
78 int dma_set_coherent_mask(struct device
*dev
, u64 mask
);
80 static inline int dma_set_coherent_mask(struct device
*dev
, u64 mask
)
82 if (!dma_supported(dev
, mask
))
84 dev
->coherent_dma_mask
= mask
;
89 extern u64
dma_get_required_mask(struct device
*dev
);
91 static inline unsigned int dma_get_max_seg_size(struct device
*dev
)
93 return dev
->dma_parms
? dev
->dma_parms
->max_segment_size
: 65536;
96 static inline unsigned int dma_set_max_seg_size(struct device
*dev
,
100 dev
->dma_parms
->max_segment_size
= size
;
106 static inline unsigned long dma_get_seg_boundary(struct device
*dev
)
108 return dev
->dma_parms
?
109 dev
->dma_parms
->segment_boundary_mask
: 0xffffffff;
112 static inline int dma_set_seg_boundary(struct device
*dev
, unsigned long mask
)
114 if (dev
->dma_parms
) {
115 dev
->dma_parms
->segment_boundary_mask
= mask
;
121 static inline void *dma_zalloc_coherent(struct device
*dev
, size_t size
,
122 dma_addr_t
*dma_handle
, gfp_t flag
)
124 void *ret
= dma_alloc_coherent(dev
, size
, dma_handle
, flag
);
126 memset(ret
, 0, size
);
130 #ifdef CONFIG_HAS_DMA
131 static inline int dma_get_cache_alignment(void)
133 #ifdef ARCH_DMA_MINALIGN
134 return ARCH_DMA_MINALIGN
;
140 /* flags for the coherent memory api */
141 #define DMA_MEMORY_MAP 0x01
142 #define DMA_MEMORY_IO 0x02
143 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
144 #define DMA_MEMORY_EXCLUSIVE 0x08
146 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
148 dma_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
149 dma_addr_t device_addr
, size_t size
, int flags
)
155 dma_release_declared_memory(struct device
*dev
)
160 dma_mark_declared_memory_occupied(struct device
*dev
,
161 dma_addr_t device_addr
, size_t size
)
163 return ERR_PTR(-EBUSY
);
170 extern void *dmam_alloc_coherent(struct device
*dev
, size_t size
,
171 dma_addr_t
*dma_handle
, gfp_t gfp
);
172 extern void dmam_free_coherent(struct device
*dev
, size_t size
, void *vaddr
,
173 dma_addr_t dma_handle
);
174 extern void *dmam_alloc_noncoherent(struct device
*dev
, size_t size
,
175 dma_addr_t
*dma_handle
, gfp_t gfp
);
176 extern void dmam_free_noncoherent(struct device
*dev
, size_t size
, void *vaddr
,
177 dma_addr_t dma_handle
);
178 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
179 extern int dmam_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
180 dma_addr_t device_addr
, size_t size
,
182 extern void dmam_release_declared_memory(struct device
*dev
);
183 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
184 static inline int dmam_declare_coherent_memory(struct device
*dev
,
185 dma_addr_t bus_addr
, dma_addr_t device_addr
,
186 size_t size
, gfp_t gfp
)
191 static inline void dmam_release_declared_memory(struct device
*dev
)
194 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
196 #ifndef CONFIG_HAVE_DMA_ATTRS
199 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
200 dma_map_single(dev, cpu_addr, size, dir)
202 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
203 dma_unmap_single(dev, dma_addr, size, dir)
205 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
206 dma_map_sg(dev, sgl, nents, dir)
208 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
209 dma_unmap_sg(dev, sgl, nents, dir)
211 #endif /* CONFIG_HAVE_DMA_ATTRS */
213 #ifdef CONFIG_NEED_DMA_MAP_STATE
214 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
215 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
216 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
217 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
218 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
219 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
221 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
222 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
223 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
224 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
225 #define dma_unmap_len(PTR, LEN_NAME) (0)
226 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
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