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 dma_addr_t (*map_page
)(struct device
*dev
, struct page
*page
,
22 unsigned long offset
, size_t size
,
23 enum dma_data_direction dir
,
24 struct dma_attrs
*attrs
);
25 void (*unmap_page
)(struct device
*dev
, dma_addr_t dma_handle
,
26 size_t size
, enum dma_data_direction dir
,
27 struct dma_attrs
*attrs
);
28 int (*map_sg
)(struct device
*dev
, struct scatterlist
*sg
,
29 int nents
, enum dma_data_direction dir
,
30 struct dma_attrs
*attrs
);
31 void (*unmap_sg
)(struct device
*dev
,
32 struct scatterlist
*sg
, int nents
,
33 enum dma_data_direction dir
,
34 struct dma_attrs
*attrs
);
35 void (*sync_single_for_cpu
)(struct device
*dev
,
36 dma_addr_t dma_handle
, size_t size
,
37 enum dma_data_direction dir
);
38 void (*sync_single_for_device
)(struct device
*dev
,
39 dma_addr_t dma_handle
, size_t size
,
40 enum dma_data_direction dir
);
41 void (*sync_sg_for_cpu
)(struct device
*dev
,
42 struct scatterlist
*sg
, int nents
,
43 enum dma_data_direction dir
);
44 void (*sync_sg_for_device
)(struct device
*dev
,
45 struct scatterlist
*sg
, int nents
,
46 enum dma_data_direction dir
);
47 int (*mapping_error
)(struct device
*dev
, dma_addr_t dma_addr
);
48 int (*dma_supported
)(struct device
*dev
, u64 mask
);
49 int (*set_dma_mask
)(struct device
*dev
, u64 mask
);
50 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
51 u64 (*get_required_mask
)(struct device
*dev
);
56 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
58 #define DMA_MASK_NONE 0x0ULL
60 static inline int valid_dma_direction(int dma_direction
)
62 return ((dma_direction
== DMA_BIDIRECTIONAL
) ||
63 (dma_direction
== DMA_TO_DEVICE
) ||
64 (dma_direction
== DMA_FROM_DEVICE
));
67 static inline int is_device_dma_capable(struct device
*dev
)
69 return dev
->dma_mask
!= NULL
&& *dev
->dma_mask
!= DMA_MASK_NONE
;
73 #include <asm/dma-mapping.h>
75 #include <asm-generic/dma-mapping-broken.h>
78 static inline u64
dma_get_mask(struct device
*dev
)
80 if (dev
&& dev
->dma_mask
&& *dev
->dma_mask
)
81 return *dev
->dma_mask
;
82 return DMA_BIT_MASK(32);
85 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
86 int dma_set_coherent_mask(struct device
*dev
, u64 mask
);
88 static inline int dma_set_coherent_mask(struct device
*dev
, u64 mask
)
90 if (!dma_supported(dev
, mask
))
92 dev
->coherent_dma_mask
= mask
;
97 extern u64
dma_get_required_mask(struct device
*dev
);
99 static inline unsigned int dma_get_max_seg_size(struct device
*dev
)
101 return dev
->dma_parms
? dev
->dma_parms
->max_segment_size
: 65536;
104 static inline unsigned int dma_set_max_seg_size(struct device
*dev
,
107 if (dev
->dma_parms
) {
108 dev
->dma_parms
->max_segment_size
= size
;
114 static inline unsigned long dma_get_seg_boundary(struct device
*dev
)
116 return dev
->dma_parms
?
117 dev
->dma_parms
->segment_boundary_mask
: 0xffffffff;
120 static inline int dma_set_seg_boundary(struct device
*dev
, unsigned long mask
)
122 if (dev
->dma_parms
) {
123 dev
->dma_parms
->segment_boundary_mask
= mask
;
129 static inline void *dma_zalloc_coherent(struct device
*dev
, size_t size
,
130 dma_addr_t
*dma_handle
, gfp_t flag
)
132 void *ret
= dma_alloc_coherent(dev
, size
, dma_handle
, flag
);
134 memset(ret
, 0, size
);
138 #ifdef CONFIG_HAS_DMA
139 static inline int dma_get_cache_alignment(void)
141 #ifdef ARCH_DMA_MINALIGN
142 return ARCH_DMA_MINALIGN
;
148 /* flags for the coherent memory api */
149 #define DMA_MEMORY_MAP 0x01
150 #define DMA_MEMORY_IO 0x02
151 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
152 #define DMA_MEMORY_EXCLUSIVE 0x08
154 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
156 dma_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
157 dma_addr_t device_addr
, size_t size
, int flags
)
163 dma_release_declared_memory(struct device
*dev
)
168 dma_mark_declared_memory_occupied(struct device
*dev
,
169 dma_addr_t device_addr
, size_t size
)
171 return ERR_PTR(-EBUSY
);
178 extern void *dmam_alloc_coherent(struct device
*dev
, size_t size
,
179 dma_addr_t
*dma_handle
, gfp_t gfp
);
180 extern void dmam_free_coherent(struct device
*dev
, size_t size
, void *vaddr
,
181 dma_addr_t dma_handle
);
182 extern void *dmam_alloc_noncoherent(struct device
*dev
, size_t size
,
183 dma_addr_t
*dma_handle
, gfp_t gfp
);
184 extern void dmam_free_noncoherent(struct device
*dev
, size_t size
, void *vaddr
,
185 dma_addr_t dma_handle
);
186 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
187 extern int dmam_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
188 dma_addr_t device_addr
, size_t size
,
190 extern void dmam_release_declared_memory(struct device
*dev
);
191 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
192 static inline int dmam_declare_coherent_memory(struct device
*dev
,
193 dma_addr_t bus_addr
, dma_addr_t device_addr
,
194 size_t size
, gfp_t gfp
)
199 static inline void dmam_release_declared_memory(struct device
*dev
)
202 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
204 #ifndef CONFIG_HAVE_DMA_ATTRS
207 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
208 dma_map_single(dev, cpu_addr, size, dir)
210 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
211 dma_unmap_single(dev, dma_addr, size, dir)
213 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
214 dma_map_sg(dev, sgl, nents, dir)
216 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
217 dma_unmap_sg(dev, sgl, nents, dir)
219 #endif /* CONFIG_HAVE_DMA_ATTRS */
221 #ifdef CONFIG_NEED_DMA_MAP_STATE
222 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
223 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
224 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
225 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
226 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
227 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
229 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
230 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
231 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
232 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
233 #define dma_unmap_len(PTR, LEN_NAME) (0)
234 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)