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 * A dma_addr_t can hold any valid DMA or bus address for the platform.
13 * It can be given to a device to use as a DMA source or target. A CPU cannot
14 * reference a dma_addr_t directly because there may be translation between
15 * its physical address space and the bus address space.
18 void* (*alloc
)(struct device
*dev
, size_t size
,
19 dma_addr_t
*dma_handle
, gfp_t gfp
,
20 struct dma_attrs
*attrs
);
21 void (*free
)(struct device
*dev
, size_t size
,
22 void *vaddr
, dma_addr_t dma_handle
,
23 struct dma_attrs
*attrs
);
24 int (*mmap
)(struct device
*, struct vm_area_struct
*,
25 void *, dma_addr_t
, size_t, struct dma_attrs
*attrs
);
27 int (*get_sgtable
)(struct device
*dev
, struct sg_table
*sgt
, void *,
28 dma_addr_t
, size_t, struct dma_attrs
*attrs
);
30 dma_addr_t (*map_page
)(struct device
*dev
, struct page
*page
,
31 unsigned long offset
, size_t size
,
32 enum dma_data_direction dir
,
33 struct dma_attrs
*attrs
);
34 void (*unmap_page
)(struct device
*dev
, dma_addr_t dma_handle
,
35 size_t size
, enum dma_data_direction dir
,
36 struct dma_attrs
*attrs
);
38 * map_sg returns 0 on error and a value > 0 on success.
39 * It should never return a value < 0.
41 int (*map_sg
)(struct device
*dev
, struct scatterlist
*sg
,
42 int nents
, enum dma_data_direction dir
,
43 struct dma_attrs
*attrs
);
44 void (*unmap_sg
)(struct device
*dev
,
45 struct scatterlist
*sg
, int nents
,
46 enum dma_data_direction dir
,
47 struct dma_attrs
*attrs
);
48 void (*sync_single_for_cpu
)(struct device
*dev
,
49 dma_addr_t dma_handle
, size_t size
,
50 enum dma_data_direction dir
);
51 void (*sync_single_for_device
)(struct device
*dev
,
52 dma_addr_t dma_handle
, size_t size
,
53 enum dma_data_direction dir
);
54 void (*sync_sg_for_cpu
)(struct device
*dev
,
55 struct scatterlist
*sg
, int nents
,
56 enum dma_data_direction dir
);
57 void (*sync_sg_for_device
)(struct device
*dev
,
58 struct scatterlist
*sg
, int nents
,
59 enum dma_data_direction dir
);
60 int (*mapping_error
)(struct device
*dev
, dma_addr_t dma_addr
);
61 int (*dma_supported
)(struct device
*dev
, u64 mask
);
62 int (*set_dma_mask
)(struct device
*dev
, u64 mask
);
63 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
64 u64 (*get_required_mask
)(struct device
*dev
);
69 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
71 #define DMA_MASK_NONE 0x0ULL
73 static inline int valid_dma_direction(int dma_direction
)
75 return ((dma_direction
== DMA_BIDIRECTIONAL
) ||
76 (dma_direction
== DMA_TO_DEVICE
) ||
77 (dma_direction
== DMA_FROM_DEVICE
));
80 static inline int is_device_dma_capable(struct device
*dev
)
82 return dev
->dma_mask
!= NULL
&& *dev
->dma_mask
!= DMA_MASK_NONE
;
86 #include <asm/dma-mapping.h>
88 #include <asm-generic/dma-mapping-broken.h>
91 static inline u64
dma_get_mask(struct device
*dev
)
93 if (dev
&& dev
->dma_mask
&& *dev
->dma_mask
)
94 return *dev
->dma_mask
;
95 return DMA_BIT_MASK(32);
98 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
99 int dma_set_coherent_mask(struct device
*dev
, u64 mask
);
101 static inline int dma_set_coherent_mask(struct device
*dev
, u64 mask
)
103 if (!dma_supported(dev
, mask
))
105 dev
->coherent_dma_mask
= mask
;
111 * Set both the DMA mask and the coherent DMA mask to the same thing.
112 * Note that we don't check the return value from dma_set_coherent_mask()
113 * as the DMA API guarantees that the coherent DMA mask can be set to
114 * the same or smaller than the streaming DMA mask.
116 static inline int dma_set_mask_and_coherent(struct device
*dev
, u64 mask
)
118 int rc
= dma_set_mask(dev
, mask
);
120 dma_set_coherent_mask(dev
, mask
);
125 * Similar to the above, except it deals with the case where the device
126 * does not have dev->dma_mask appropriately setup.
128 static inline int dma_coerce_mask_and_coherent(struct device
*dev
, u64 mask
)
130 dev
->dma_mask
= &dev
->coherent_dma_mask
;
131 return dma_set_mask_and_coherent(dev
, mask
);
134 extern u64
dma_get_required_mask(struct device
*dev
);
136 #ifndef arch_setup_dma_ops
137 static inline void arch_setup_dma_ops(struct device
*dev
, u64 dma_base
,
138 u64 size
, struct iommu_ops
*iommu
,
142 #ifndef arch_teardown_dma_ops
143 static inline void arch_teardown_dma_ops(struct device
*dev
) { }
146 static inline unsigned int dma_get_max_seg_size(struct device
*dev
)
148 return dev
->dma_parms
? dev
->dma_parms
->max_segment_size
: 65536;
151 static inline unsigned int dma_set_max_seg_size(struct device
*dev
,
154 if (dev
->dma_parms
) {
155 dev
->dma_parms
->max_segment_size
= size
;
161 static inline unsigned long dma_get_seg_boundary(struct device
*dev
)
163 return dev
->dma_parms
?
164 dev
->dma_parms
->segment_boundary_mask
: 0xffffffff;
167 static inline int dma_set_seg_boundary(struct device
*dev
, unsigned long mask
)
169 if (dev
->dma_parms
) {
170 dev
->dma_parms
->segment_boundary_mask
= mask
;
177 static inline unsigned long dma_max_pfn(struct device
*dev
)
179 return *dev
->dma_mask
>> PAGE_SHIFT
;
183 static inline void *dma_zalloc_coherent(struct device
*dev
, size_t size
,
184 dma_addr_t
*dma_handle
, gfp_t flag
)
186 void *ret
= dma_alloc_coherent(dev
, size
, dma_handle
,
191 #ifdef CONFIG_HAS_DMA
192 static inline int dma_get_cache_alignment(void)
194 #ifdef ARCH_DMA_MINALIGN
195 return ARCH_DMA_MINALIGN
;
201 /* flags for the coherent memory api */
202 #define DMA_MEMORY_MAP 0x01
203 #define DMA_MEMORY_IO 0x02
204 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
205 #define DMA_MEMORY_EXCLUSIVE 0x08
207 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
209 dma_declare_coherent_memory(struct device
*dev
, phys_addr_t phys_addr
,
210 dma_addr_t device_addr
, size_t size
, int flags
)
216 dma_release_declared_memory(struct device
*dev
)
221 dma_mark_declared_memory_occupied(struct device
*dev
,
222 dma_addr_t device_addr
, size_t size
)
224 return ERR_PTR(-EBUSY
);
231 extern void *dmam_alloc_coherent(struct device
*dev
, size_t size
,
232 dma_addr_t
*dma_handle
, gfp_t gfp
);
233 extern void dmam_free_coherent(struct device
*dev
, size_t size
, void *vaddr
,
234 dma_addr_t dma_handle
);
235 extern void *dmam_alloc_noncoherent(struct device
*dev
, size_t size
,
236 dma_addr_t
*dma_handle
, gfp_t gfp
);
237 extern void dmam_free_noncoherent(struct device
*dev
, size_t size
, void *vaddr
,
238 dma_addr_t dma_handle
);
239 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
240 extern int dmam_declare_coherent_memory(struct device
*dev
,
241 phys_addr_t phys_addr
,
242 dma_addr_t device_addr
, size_t size
,
244 extern void dmam_release_declared_memory(struct device
*dev
);
245 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
246 static inline int dmam_declare_coherent_memory(struct device
*dev
,
247 phys_addr_t phys_addr
, dma_addr_t device_addr
,
248 size_t size
, gfp_t gfp
)
253 static inline void dmam_release_declared_memory(struct device
*dev
)
256 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
258 #ifndef CONFIG_HAVE_DMA_ATTRS
261 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
262 dma_map_single(dev, cpu_addr, size, dir)
264 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
265 dma_unmap_single(dev, dma_addr, size, dir)
267 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
268 dma_map_sg(dev, sgl, nents, dir)
270 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
271 dma_unmap_sg(dev, sgl, nents, dir)
274 static inline void *dma_alloc_writecombine(struct device
*dev
, size_t size
,
275 dma_addr_t
*dma_addr
, gfp_t gfp
)
277 DEFINE_DMA_ATTRS(attrs
);
278 dma_set_attr(DMA_ATTR_WRITE_COMBINE
, &attrs
);
279 return dma_alloc_attrs(dev
, size
, dma_addr
, gfp
, &attrs
);
282 static inline void dma_free_writecombine(struct device
*dev
, size_t size
,
283 void *cpu_addr
, dma_addr_t dma_addr
)
285 DEFINE_DMA_ATTRS(attrs
);
286 dma_set_attr(DMA_ATTR_WRITE_COMBINE
, &attrs
);
287 return dma_free_attrs(dev
, size
, cpu_addr
, dma_addr
, &attrs
);
290 static inline int dma_mmap_writecombine(struct device
*dev
,
291 struct vm_area_struct
*vma
,
292 void *cpu_addr
, dma_addr_t dma_addr
,
295 DEFINE_DMA_ATTRS(attrs
);
296 dma_set_attr(DMA_ATTR_WRITE_COMBINE
, &attrs
);
297 return dma_mmap_attrs(dev
, vma
, cpu_addr
, dma_addr
, size
, &attrs
);
299 #endif /* CONFIG_HAVE_DMA_ATTRS */
301 #ifdef CONFIG_NEED_DMA_MAP_STATE
302 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
303 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
304 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
305 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
306 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
307 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
309 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
310 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
311 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
312 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
313 #define dma_unmap_len(PTR, LEN_NAME) (0)
314 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
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