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)