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 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
22 dma_addr_t, size_t, struct dma_attrs *attrs);
24 dma_addr_t (*map_page)(struct device *dev, struct page *page,
25 unsigned long offset, size_t size,
26 enum dma_data_direction dir,
27 struct dma_attrs *attrs);
28 void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
29 size_t size, enum dma_data_direction dir,
30 struct dma_attrs *attrs);
31 int (*map_sg)(struct device *dev, struct scatterlist *sg,
32 int nents, enum dma_data_direction dir,
33 struct dma_attrs *attrs);
34 void (*unmap_sg)(struct device *dev,
35 struct scatterlist *sg, int nents,
36 enum dma_data_direction dir,
37 struct dma_attrs *attrs);
38 void (*sync_single_for_cpu)(struct device *dev,
39 dma_addr_t dma_handle, size_t size,
40 enum dma_data_direction dir);
41 void (*sync_single_for_device)(struct device *dev,
42 dma_addr_t dma_handle, size_t size,
43 enum dma_data_direction dir);
44 void (*sync_sg_for_cpu)(struct device *dev,
45 struct scatterlist *sg, int nents,
46 enum dma_data_direction dir);
47 void (*sync_sg_for_device)(struct device *dev,
48 struct scatterlist *sg, int nents,
49 enum dma_data_direction dir);
50 int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
51 int (*dma_supported)(struct device *dev, u64 mask);
52 int (*set_dma_mask)(struct device *dev, u64 mask);
53 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
54 u64 (*get_required_mask)(struct device *dev);
59 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
61 #define DMA_MASK_NONE 0x0ULL
63 static inline int valid_dma_direction(int dma_direction)
65 return ((dma_direction == DMA_BIDIRECTIONAL) ||
66 (dma_direction == DMA_TO_DEVICE) ||
67 (dma_direction == DMA_FROM_DEVICE));
70 static inline int is_device_dma_capable(struct device *dev)
72 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
76 #include <asm/dma-mapping.h>
78 #include <asm-generic/dma-mapping-broken.h>
81 static inline u64 dma_get_mask(struct device *dev)
83 if (dev && dev->dma_mask && *dev->dma_mask)
84 return *dev->dma_mask;
85 return DMA_BIT_MASK(32);
88 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
89 int dma_set_coherent_mask(struct device *dev, u64 mask);
91 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
93 if (!dma_supported(dev, mask))
95 dev->coherent_dma_mask = mask;
101 * Set both the DMA mask and the coherent DMA mask to the same thing.
102 * Note that we don't check the return value from dma_set_coherent_mask()
103 * as the DMA API guarantees that the coherent DMA mask can be set to
104 * the same or smaller than the streaming DMA mask.
106 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
108 int rc = dma_set_mask(dev, mask);
110 dma_set_coherent_mask(dev, mask);
115 * Similar to the above, except it deals with the case where the device
116 * does not have dev->dma_mask appropriately setup.
118 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
120 dev->dma_mask = &dev->coherent_dma_mask;
121 return dma_set_mask_and_coherent(dev, mask);
124 extern u64 dma_get_required_mask(struct device *dev);
126 static inline unsigned int dma_get_max_seg_size(struct device *dev)
128 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
131 static inline unsigned int dma_set_max_seg_size(struct device *dev,
134 if (dev->dma_parms) {
135 dev->dma_parms->max_segment_size = size;
141 static inline unsigned long dma_get_seg_boundary(struct device *dev)
143 return dev->dma_parms ?
144 dev->dma_parms->segment_boundary_mask : 0xffffffff;
147 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
149 if (dev->dma_parms) {
150 dev->dma_parms->segment_boundary_mask = mask;
157 static inline unsigned long dma_max_pfn(struct device *dev)
159 return *dev->dma_mask >> PAGE_SHIFT;
163 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
164 dma_addr_t *dma_handle, gfp_t flag)
166 void *ret = dma_alloc_coherent(dev, size, dma_handle,
171 #ifdef CONFIG_HAS_DMA
172 static inline int dma_get_cache_alignment(void)
174 #ifdef ARCH_DMA_MINALIGN
175 return ARCH_DMA_MINALIGN;
181 /* flags for the coherent memory api */
182 #define DMA_MEMORY_MAP 0x01
183 #define DMA_MEMORY_IO 0x02
184 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
185 #define DMA_MEMORY_EXCLUSIVE 0x08
187 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
189 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
190 dma_addr_t device_addr, size_t size, int flags)
196 dma_release_declared_memory(struct device *dev)
201 dma_mark_declared_memory_occupied(struct device *dev,
202 dma_addr_t device_addr, size_t size)
204 return ERR_PTR(-EBUSY);
211 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
212 dma_addr_t *dma_handle, gfp_t gfp);
213 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
214 dma_addr_t dma_handle);
215 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
216 dma_addr_t *dma_handle, gfp_t gfp);
217 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
218 dma_addr_t dma_handle);
219 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
220 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
221 dma_addr_t device_addr, size_t size,
223 extern void dmam_release_declared_memory(struct device *dev);
224 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
225 static inline int dmam_declare_coherent_memory(struct device *dev,
226 dma_addr_t bus_addr, dma_addr_t device_addr,
227 size_t size, gfp_t gfp)
232 static inline void dmam_release_declared_memory(struct device *dev)
235 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
237 #ifndef CONFIG_HAVE_DMA_ATTRS
240 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
241 dma_map_single(dev, cpu_addr, size, dir)
243 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
244 dma_unmap_single(dev, dma_addr, size, dir)
246 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
247 dma_map_sg(dev, sgl, nents, dir)
249 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
250 dma_unmap_sg(dev, sgl, nents, dir)
252 #endif /* CONFIG_HAVE_DMA_ATTRS */
254 #ifdef CONFIG_NEED_DMA_MAP_STATE
255 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
256 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
257 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
258 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
259 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
260 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
262 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
263 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
264 #define dma_unmap_addr(PTR, ADDR_NAME) (0)
265 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
266 #define dma_unmap_len(PTR, LEN_NAME) (0)
267 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)