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/dma-direction.h>
8 #include <linux/scatterlist.h>
11 void* (*alloc_coherent)(struct device *dev, size_t size,
12 dma_addr_t *dma_handle, gfp_t gfp);
13 void (*free_coherent)(struct device *dev, size_t size,
14 void *vaddr, dma_addr_t dma_handle);
15 dma_addr_t (*map_page)(struct device *dev, struct page *page,
16 unsigned long offset, size_t size,
17 enum dma_data_direction dir,
18 struct dma_attrs *attrs);
19 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
20 size_t size, enum dma_data_direction dir,
21 struct dma_attrs *attrs);
22 int (*map_sg)(struct device *dev, struct scatterlist *sg,
23 int nents, enum dma_data_direction dir,
24 struct dma_attrs *attrs);
25 void (*unmap_sg)(struct device *dev,
26 struct scatterlist *sg, int nents,
27 enum dma_data_direction dir,
28 struct dma_attrs *attrs);
29 void (*sync_single_for_cpu)(struct device *dev,
30 dma_addr_t dma_handle, size_t size,
31 enum dma_data_direction dir);
32 void (*sync_single_for_device)(struct device *dev,
33 dma_addr_t dma_handle, size_t size,
34 enum dma_data_direction dir);
35 void (*sync_sg_for_cpu)(struct device *dev,
36 struct scatterlist *sg, int nents,
37 enum dma_data_direction dir);
38 void (*sync_sg_for_device)(struct device *dev,
39 struct scatterlist *sg, int nents,
40 enum dma_data_direction dir);
41 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
42 int (*dma_supported)(struct device *dev, u64 mask);
43 int (*set_dma_mask)(struct device *dev, u64 mask);
44 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
45 u64 (*get_required_mask)(struct device *dev);
50 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
52 #define DMA_MASK_NONE 0x0ULL
54 static inline int valid_dma_direction(int dma_direction)
56 return ((dma_direction == DMA_BIDIRECTIONAL) ||
57 (dma_direction == DMA_TO_DEVICE) ||
58 (dma_direction == DMA_FROM_DEVICE));
61 static inline int is_device_dma_capable(struct device *dev)
63 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
67 #include <asm/dma-mapping.h>
69 #include <asm-generic/dma-mapping-broken.h>
72 static inline u64 dma_get_mask(struct device *dev)
74 if (dev && dev->dma_mask && *dev->dma_mask)
75 return *dev->dma_mask;
76 return DMA_BIT_MASK(32);
79 #ifdef ARCH_HAS_DMA_SET_COHERENT_MASK
80 int dma_set_coherent_mask(struct device *dev, u64 mask);
82 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
84 if (!dma_supported(dev, mask))
86 dev->coherent_dma_mask = mask;
91 extern u64 dma_get_required_mask(struct device *dev);
93 static inline unsigned int dma_get_max_seg_size(struct device *dev)
95 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
98 static inline unsigned int dma_set_max_seg_size(struct device *dev,
101 if (dev->dma_parms) {
102 dev->dma_parms->max_segment_size = size;
108 static inline unsigned long dma_get_seg_boundary(struct device *dev)
110 return dev->dma_parms ?
111 dev->dma_parms->segment_boundary_mask : 0xffffffff;
114 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
116 if (dev->dma_parms) {
117 dev->dma_parms->segment_boundary_mask = mask;
123 #ifdef CONFIG_HAS_DMA
124 static inline int dma_get_cache_alignment(void)
126 #ifdef ARCH_DMA_MINALIGN
127 return ARCH_DMA_MINALIGN;
133 /* flags for the coherent memory api */
134 #define DMA_MEMORY_MAP 0x01
135 #define DMA_MEMORY_IO 0x02
136 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
137 #define DMA_MEMORY_EXCLUSIVE 0x08
139 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
141 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
142 dma_addr_t device_addr, size_t size, int flags)
148 dma_release_declared_memory(struct device *dev)
153 dma_mark_declared_memory_occupied(struct device *dev,
154 dma_addr_t device_addr, size_t size)
156 return ERR_PTR(-EBUSY);
163 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
164 dma_addr_t *dma_handle, gfp_t gfp);
165 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
166 dma_addr_t dma_handle);
167 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
168 dma_addr_t *dma_handle, gfp_t gfp);
169 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
170 dma_addr_t dma_handle);
171 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
172 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
173 dma_addr_t device_addr, size_t size,
175 extern void dmam_release_declared_memory(struct device *dev);
176 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
177 static inline int dmam_declare_coherent_memory(struct device *dev,
178 dma_addr_t bus_addr, dma_addr_t device_addr,
179 size_t size, gfp_t gfp)
184 static inline void dmam_release_declared_memory(struct device *dev)
187 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
189 #ifndef CONFIG_HAVE_DMA_ATTRS
192 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
193 dma_map_single(dev, cpu_addr, size, dir)
195 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
196 dma_unmap_single(dev, dma_addr, size, dir)
198 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
199 dma_map_sg(dev, sgl, nents, dir)
201 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
202 dma_unmap_sg(dev, sgl, nents, dir)
204 #endif /* CONFIG_HAVE_DMA_ATTRS */
206 #ifdef CONFIG_NEED_DMA_MAP_STATE
207 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
208 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
209 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
210 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
211 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
212 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
214 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
215 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
216 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
217 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
218 #define dma_unmap_len(PTR, LEN_NAME) (0)
219 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)