1 #ifndef _LINUX_DMA_MAPPING_H 2 #define _LINUX_DMA_MAPPING_H 3 4 #include <linux/string.h> 5 #include <linux/device.h> 6 #include <linux/err.h> 7 #include <linux/dma-attrs.h> 8 #include <linux/dma-direction.h> 9 #include <linux/scatterlist.h> 10 11 struct dma_map_ops { 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); 20 21 int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *, 22 dma_addr_t, size_t, struct dma_attrs *attrs); 23 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); 55 #endif 56 int is_phys; 57 }; 58 59 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) 60 61 #define DMA_MASK_NONE 0x0ULL 62 63 static inline int valid_dma_direction(int dma_direction) 64 { 65 return ((dma_direction == DMA_BIDIRECTIONAL) || 66 (dma_direction == DMA_TO_DEVICE) || 67 (dma_direction == DMA_FROM_DEVICE)); 68 } 69 70 static inline int is_device_dma_capable(struct device *dev) 71 { 72 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; 73 } 74 75 #ifdef CONFIG_HAS_DMA 76 #include <asm/dma-mapping.h> 77 #else 78 #include <asm-generic/dma-mapping-broken.h> 79 #endif 80 81 static inline u64 dma_get_mask(struct device *dev) 82 { 83 if (dev && dev->dma_mask && *dev->dma_mask) 84 return *dev->dma_mask; 85 return DMA_BIT_MASK(32); 86 } 87 88 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK 89 int dma_set_coherent_mask(struct device *dev, u64 mask); 90 #else 91 static inline int dma_set_coherent_mask(struct device *dev, u64 mask) 92 { 93 if (!dma_supported(dev, mask)) 94 return -EIO; 95 dev->coherent_dma_mask = mask; 96 return 0; 97 } 98 #endif 99 100 extern u64 dma_get_required_mask(struct device *dev); 101 102 static inline unsigned int dma_get_max_seg_size(struct device *dev) 103 { 104 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536; 105 } 106 107 static inline unsigned int dma_set_max_seg_size(struct device *dev, 108 unsigned int size) 109 { 110 if (dev->dma_parms) { 111 dev->dma_parms->max_segment_size = size; 112 return 0; 113 } else 114 return -EIO; 115 } 116 117 static inline unsigned long dma_get_seg_boundary(struct device *dev) 118 { 119 return dev->dma_parms ? 120 dev->dma_parms->segment_boundary_mask : 0xffffffff; 121 } 122 123 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) 124 { 125 if (dev->dma_parms) { 126 dev->dma_parms->segment_boundary_mask = mask; 127 return 0; 128 } else 129 return -EIO; 130 } 131 132 static inline void *dma_zalloc_coherent(struct device *dev, size_t size, 133 dma_addr_t *dma_handle, gfp_t flag) 134 { 135 void *ret = dma_alloc_coherent(dev, size, dma_handle, flag); 136 if (ret) 137 memset(ret, 0, size); 138 return ret; 139 } 140 141 #ifdef CONFIG_HAS_DMA 142 static inline int dma_get_cache_alignment(void) 143 { 144 #ifdef ARCH_DMA_MINALIGN 145 return ARCH_DMA_MINALIGN; 146 #endif 147 return 1; 148 } 149 #endif 150 151 /* flags for the coherent memory api */ 152 #define DMA_MEMORY_MAP 0x01 153 #define DMA_MEMORY_IO 0x02 154 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 155 #define DMA_MEMORY_EXCLUSIVE 0x08 156 157 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 158 static inline int 159 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 160 dma_addr_t device_addr, size_t size, int flags) 161 { 162 return 0; 163 } 164 165 static inline void 166 dma_release_declared_memory(struct device *dev) 167 { 168 } 169 170 static inline void * 171 dma_mark_declared_memory_occupied(struct device *dev, 172 dma_addr_t device_addr, size_t size) 173 { 174 return ERR_PTR(-EBUSY); 175 } 176 #endif 177 178 /* 179 * Managed DMA API 180 */ 181 extern void *dmam_alloc_coherent(struct device *dev, size_t size, 182 dma_addr_t *dma_handle, gfp_t gfp); 183 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, 184 dma_addr_t dma_handle); 185 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, 186 dma_addr_t *dma_handle, gfp_t gfp); 187 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, 188 dma_addr_t dma_handle); 189 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 190 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 191 dma_addr_t device_addr, size_t size, 192 int flags); 193 extern void dmam_release_declared_memory(struct device *dev); 194 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 195 static inline int dmam_declare_coherent_memory(struct device *dev, 196 dma_addr_t bus_addr, dma_addr_t device_addr, 197 size_t size, gfp_t gfp) 198 { 199 return 0; 200 } 201 202 static inline void dmam_release_declared_memory(struct device *dev) 203 { 204 } 205 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 206 207 #ifndef CONFIG_HAVE_DMA_ATTRS 208 struct dma_attrs; 209 210 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \ 211 dma_map_single(dev, cpu_addr, size, dir) 212 213 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ 214 dma_unmap_single(dev, dma_addr, size, dir) 215 216 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ 217 dma_map_sg(dev, sgl, nents, dir) 218 219 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ 220 dma_unmap_sg(dev, sgl, nents, dir) 221 222 #endif /* CONFIG_HAVE_DMA_ATTRS */ 223 224 #ifdef CONFIG_NEED_DMA_MAP_STATE 225 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME 226 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME 227 #define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME) 228 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL)) 229 #define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME) 230 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL)) 231 #else 232 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) 233 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME) 234 #define dma_unmap_addr(PTR, ADDR_NAME) (0) 235 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0) 236 #define dma_unmap_len(PTR, LEN_NAME) (0) 237 #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) 238 #endif 239 240 #endif 241