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);
64 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
67 * NOTE: do not use the below macros in new code and do not add new definitions
70 * Instead, just open-code DMA_BIT_MASK(n) within your driver
72 #define DMA_64BIT_MASK DMA_BIT_MASK(64)
73 #define DMA_48BIT_MASK DMA_BIT_MASK(48)
74 #define DMA_47BIT_MASK DMA_BIT_MASK(47)
75 #define DMA_40BIT_MASK DMA_BIT_MASK(40)
76 #define DMA_39BIT_MASK DMA_BIT_MASK(39)
77 #define DMA_35BIT_MASK DMA_BIT_MASK(35)
78 #define DMA_32BIT_MASK DMA_BIT_MASK(32)
79 #define DMA_31BIT_MASK DMA_BIT_MASK(31)
80 #define DMA_30BIT_MASK DMA_BIT_MASK(30)
81 #define DMA_29BIT_MASK DMA_BIT_MASK(29)
82 #define DMA_28BIT_MASK DMA_BIT_MASK(28)
83 #define DMA_24BIT_MASK DMA_BIT_MASK(24)
85 #define DMA_MASK_NONE 0x0ULL
87 static inline int valid_dma_direction(int dma_direction)
89 return ((dma_direction == DMA_BIDIRECTIONAL) ||
90 (dma_direction == DMA_TO_DEVICE) ||
91 (dma_direction == DMA_FROM_DEVICE));
94 static inline int is_device_dma_capable(struct device *dev)
96 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
99 static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
101 return addr + size <= mask;
104 #ifdef CONFIG_HAS_DMA
105 #include <asm/dma-mapping.h>
107 #include <asm-generic/dma-mapping-broken.h>
110 /* Backwards compat, remove in 2.7.x */
111 #define dma_sync_single dma_sync_single_for_cpu
112 #define dma_sync_sg dma_sync_sg_for_cpu
114 static inline u64 dma_get_mask(struct device *dev)
116 if (dev && dev->dma_mask && *dev->dma_mask)
117 return *dev->dma_mask;
118 return DMA_BIT_MASK(32);
121 extern u64 dma_get_required_mask(struct device *dev);
123 static inline unsigned int dma_get_max_seg_size(struct device *dev)
125 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
128 static inline unsigned int dma_set_max_seg_size(struct device *dev,
131 if (dev->dma_parms) {
132 dev->dma_parms->max_segment_size = size;
138 static inline unsigned long dma_get_seg_boundary(struct device *dev)
140 return dev->dma_parms ?
141 dev->dma_parms->segment_boundary_mask : 0xffffffff;
144 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
146 if (dev->dma_parms) {
147 dev->dma_parms->segment_boundary_mask = mask;
153 /* flags for the coherent memory api */
154 #define DMA_MEMORY_MAP 0x01
155 #define DMA_MEMORY_IO 0x02
156 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04
157 #define DMA_MEMORY_EXCLUSIVE 0x08
159 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
161 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
162 dma_addr_t device_addr, size_t size, int flags)
168 dma_release_declared_memory(struct device *dev)
173 dma_mark_declared_memory_occupied(struct device *dev,
174 dma_addr_t device_addr, size_t size)
176 return ERR_PTR(-EBUSY);
183 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
184 dma_addr_t *dma_handle, gfp_t gfp);
185 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
186 dma_addr_t dma_handle);
187 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
188 dma_addr_t *dma_handle, gfp_t gfp);
189 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
190 dma_addr_t dma_handle);
191 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
192 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
193 dma_addr_t device_addr, size_t size,
195 extern void dmam_release_declared_memory(struct device *dev);
196 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
197 static inline int dmam_declare_coherent_memory(struct device *dev,
198 dma_addr_t bus_addr, dma_addr_t device_addr,
199 size_t size, gfp_t gfp)
204 static inline void dmam_release_declared_memory(struct device *dev)
207 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
209 #ifndef CONFIG_HAVE_DMA_ATTRS
212 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
213 dma_map_single(dev, cpu_addr, size, dir)
215 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
216 dma_unmap_single(dev, dma_addr, size, dir)
218 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
219 dma_map_sg(dev, sgl, nents, dir)
221 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
222 dma_unmap_sg(dev, sgl, nents, dir)
224 #endif /* CONFIG_HAVE_DMA_ATTRS */