1 #ifndef _LINUX_DMA_MAPPING_H
2 #define _LINUX_DMA_MAPPING_H
4 #include <linux/device.h>
6 #include <linux/dma-attrs.h>
7 #include <linux/scatterlist.h>
9 /* These definitions mirror those in pci.h, so they can be used
10 * interchangeably with their PCI_ counterparts */
11 enum dma_data_direction
{
12 DMA_BIDIRECTIONAL
= 0,
19 void* (*alloc_coherent
)(struct device
*dev
, size_t size
,
20 dma_addr_t
*dma_handle
, gfp_t gfp
);
21 void (*free_coherent
)(struct device
*dev
, size_t size
,
22 void *vaddr
, dma_addr_t dma_handle
);
23 dma_addr_t (*map_page
)(struct device
*dev
, struct page
*page
,
24 unsigned long offset
, size_t size
,
25 enum dma_data_direction dir
,
26 struct dma_attrs
*attrs
);
27 void (*unmap_page
)(struct device
*dev
, dma_addr_t dma_handle
,
28 size_t size
, enum dma_data_direction dir
,
29 struct dma_attrs
*attrs
);
30 int (*map_sg
)(struct device
*dev
, struct scatterlist
*sg
,
31 int nents
, enum dma_data_direction dir
,
32 struct dma_attrs
*attrs
);
33 void (*unmap_sg
)(struct device
*dev
,
34 struct scatterlist
*sg
, int nents
,
35 enum dma_data_direction dir
,
36 struct dma_attrs
*attrs
);
37 void (*sync_single_for_cpu
)(struct device
*dev
,
38 dma_addr_t dma_handle
, size_t size
,
39 enum dma_data_direction dir
);
40 void (*sync_single_for_device
)(struct device
*dev
,
41 dma_addr_t dma_handle
, size_t size
,
42 enum dma_data_direction dir
);
43 void (*sync_single_range_for_cpu
)(struct device
*dev
,
44 dma_addr_t dma_handle
,
47 enum dma_data_direction dir
);
48 void (*sync_single_range_for_device
)(struct device
*dev
,
49 dma_addr_t dma_handle
,
52 enum dma_data_direction dir
);
53 void (*sync_sg_for_cpu
)(struct device
*dev
,
54 struct scatterlist
*sg
, int nents
,
55 enum dma_data_direction dir
);
56 void (*sync_sg_for_device
)(struct device
*dev
,
57 struct scatterlist
*sg
, int nents
,
58 enum dma_data_direction dir
);
59 int (*mapping_error
)(struct device
*dev
, dma_addr_t dma_addr
);
60 int (*dma_supported
)(struct device
*dev
, u64 mask
);
61 int (*set_dma_mask
)(struct device
*dev
, u64 mask
);
65 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
67 typedef u64 DMA_nnBIT_MASK __deprecated
;
70 * NOTE: do not use the below macros in new code and do not add new definitions
73 * Instead, just open-code DMA_BIT_MASK(n) within your driver
75 #define DMA_64BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(64)
76 #define DMA_48BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(48)
77 #define DMA_47BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(47)
78 #define DMA_40BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(40)
79 #define DMA_39BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(39)
80 #define DMA_35BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(35)
81 #define DMA_32BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(32)
82 #define DMA_31BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(31)
83 #define DMA_30BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(30)
84 #define DMA_29BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(29)
85 #define DMA_28BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(28)
86 #define DMA_24BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(24)
88 #define DMA_MASK_NONE 0x0ULL
90 static inline int valid_dma_direction(int dma_direction
)
92 return ((dma_direction
== DMA_BIDIRECTIONAL
) ||
93 (dma_direction
== DMA_TO_DEVICE
) ||
94 (dma_direction
== DMA_FROM_DEVICE
));
97 static inline int is_device_dma_capable(struct device
*dev
)
99 return dev
->dma_mask
!= NULL
&& *dev
->dma_mask
!= DMA_MASK_NONE
;
102 #ifdef CONFIG_HAS_DMA
103 #include <asm/dma-mapping.h>
105 #include <asm-generic/dma-mapping-broken.h>
108 /* for backwards compatibility, removed soon */
109 static inline void __deprecated
dma_sync_single(struct device
*dev
,
110 dma_addr_t addr
, size_t size
,
111 enum dma_data_direction dir
)
113 dma_sync_single_for_cpu(dev
, addr
, size
, dir
);
116 static inline void __deprecated
dma_sync_sg(struct device
*dev
,
117 struct scatterlist
*sg
, int nelems
,
118 enum dma_data_direction dir
)
120 dma_sync_sg_for_cpu(dev
, sg
, nelems
, dir
);
123 static inline u64
dma_get_mask(struct device
*dev
)
125 if (dev
&& dev
->dma_mask
&& *dev
->dma_mask
)
126 return *dev
->dma_mask
;
127 return DMA_BIT_MASK(32);
130 static inline int dma_set_coherent_mask(struct device
*dev
, u64 mask
)
132 if (!dma_supported(dev
, mask
))
134 dev
->coherent_dma_mask
= mask
;
138 extern u64
dma_get_required_mask(struct device
*dev
);
140 static inline unsigned int dma_get_max_seg_size(struct device
*dev
)
142 return dev
->dma_parms
? dev
->dma_parms
->max_segment_size
: 65536;
145 static inline unsigned int dma_set_max_seg_size(struct device
*dev
,
148 if (dev
->dma_parms
) {
149 dev
->dma_parms
->max_segment_size
= size
;
155 static inline unsigned long dma_get_seg_boundary(struct device
*dev
)
157 return dev
->dma_parms
?
158 dev
->dma_parms
->segment_boundary_mask
: 0xffffffff;
161 static inline int dma_set_seg_boundary(struct device
*dev
, unsigned long mask
)
163 if (dev
->dma_parms
) {
164 dev
->dma_parms
->segment_boundary_mask
= mask
;
170 /* flags for the coherent memory api */
171 #define DMA_MEMORY_MAP 0x01
172 #define DMA_MEMORY_IO 0x02
173 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
174 #define DMA_MEMORY_EXCLUSIVE 0x08
176 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
178 dma_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
179 dma_addr_t device_addr
, size_t size
, int flags
)
185 dma_release_declared_memory(struct device
*dev
)
190 dma_mark_declared_memory_occupied(struct device
*dev
,
191 dma_addr_t device_addr
, size_t size
)
193 return ERR_PTR(-EBUSY
);
200 extern void *dmam_alloc_coherent(struct device
*dev
, size_t size
,
201 dma_addr_t
*dma_handle
, gfp_t gfp
);
202 extern void dmam_free_coherent(struct device
*dev
, size_t size
, void *vaddr
,
203 dma_addr_t dma_handle
);
204 extern void *dmam_alloc_noncoherent(struct device
*dev
, size_t size
,
205 dma_addr_t
*dma_handle
, gfp_t gfp
);
206 extern void dmam_free_noncoherent(struct device
*dev
, size_t size
, void *vaddr
,
207 dma_addr_t dma_handle
);
208 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
209 extern int dmam_declare_coherent_memory(struct device
*dev
, dma_addr_t bus_addr
,
210 dma_addr_t device_addr
, size_t size
,
212 extern void dmam_release_declared_memory(struct device
*dev
);
213 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
214 static inline int dmam_declare_coherent_memory(struct device
*dev
,
215 dma_addr_t bus_addr
, dma_addr_t device_addr
,
216 size_t size
, gfp_t gfp
)
221 static inline void dmam_release_declared_memory(struct device
*dev
)
224 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
226 #ifndef CONFIG_HAVE_DMA_ATTRS
229 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
230 dma_map_single(dev, cpu_addr, size, dir)
232 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
233 dma_unmap_single(dev, dma_addr, size, dir)
235 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
236 dma_map_sg(dev, sgl, nents, dir)
238 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
239 dma_unmap_sg(dev, sgl, nents, dir)
241 #endif /* CONFIG_HAVE_DMA_ATTRS */
243 #ifdef CONFIG_NEED_DMA_MAP_STATE
244 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
245 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
246 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
247 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
248 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
249 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
251 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
252 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
253 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
254 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
255 #define dma_unmap_len(PTR, LEN_NAME) (0)
256 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)