1 #ifndef _LINUX_DMA_MAPPING_H 2 #define _LINUX_DMA_MAPPING_H 3 4 #include <linux/device.h> 5 #include <linux/err.h> 6 #include <linux/dma-attrs.h> 7 #include <linux/scatterlist.h> 8 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, 13 DMA_TO_DEVICE = 1, 14 DMA_FROM_DEVICE = 2, 15 DMA_NONE = 3, 16 }; 17 18 struct dma_map_ops { 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, 45 unsigned long offset, 46 size_t size, 47 enum dma_data_direction dir); 48 void (*sync_single_range_for_device)(struct device *dev, 49 dma_addr_t dma_handle, 50 unsigned long offset, 51 size_t size, 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); 61 int is_phys; 62 }; 63 64 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) 65 66 typedef u64 DMA_nnBIT_MASK __deprecated; 67 68 /* 69 * NOTE: do not use the below macros in new code and do not add new definitions 70 * here. 71 * 72 * Instead, just open-code DMA_BIT_MASK(n) within your driver 73 */ 74 #define DMA_64BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(64) 75 #define DMA_48BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(48) 76 #define DMA_47BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(47) 77 #define DMA_40BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(40) 78 #define DMA_39BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(39) 79 #define DMA_35BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(35) 80 #define DMA_32BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(32) 81 #define DMA_31BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(31) 82 #define DMA_30BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(30) 83 #define DMA_29BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(29) 84 #define DMA_28BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(28) 85 #define DMA_24BIT_MASK (DMA_nnBIT_MASK)DMA_BIT_MASK(24) 86 87 #define DMA_MASK_NONE 0x0ULL 88 89 static inline int valid_dma_direction(int dma_direction) 90 { 91 return ((dma_direction == DMA_BIDIRECTIONAL) || 92 (dma_direction == DMA_TO_DEVICE) || 93 (dma_direction == DMA_FROM_DEVICE)); 94 } 95 96 static inline int is_device_dma_capable(struct device *dev) 97 { 98 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; 99 } 100 101 static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size) 102 { 103 return addr + size <= mask; 104 } 105 106 #ifdef CONFIG_HAS_DMA 107 #include <asm/dma-mapping.h> 108 #else 109 #include <asm-generic/dma-mapping-broken.h> 110 #endif 111 112 /* for backwards compatibility, removed soon */ 113 static inline void __deprecated dma_sync_single(struct device *dev, 114 dma_addr_t addr, size_t size, 115 enum dma_data_direction dir) 116 { 117 dma_sync_single_for_cpu(dev, addr, size, dir); 118 } 119 120 static inline void __deprecated dma_sync_sg(struct device *dev, 121 struct scatterlist *sg, int nelems, 122 enum dma_data_direction dir) 123 { 124 dma_sync_sg_for_cpu(dev, sg, nelems, dir); 125 } 126 127 static inline u64 dma_get_mask(struct device *dev) 128 { 129 if (dev && dev->dma_mask && *dev->dma_mask) 130 return *dev->dma_mask; 131 return DMA_BIT_MASK(32); 132 } 133 134 extern u64 dma_get_required_mask(struct device *dev); 135 136 static inline unsigned int dma_get_max_seg_size(struct device *dev) 137 { 138 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536; 139 } 140 141 static inline unsigned int dma_set_max_seg_size(struct device *dev, 142 unsigned int size) 143 { 144 if (dev->dma_parms) { 145 dev->dma_parms->max_segment_size = size; 146 return 0; 147 } else 148 return -EIO; 149 } 150 151 static inline unsigned long dma_get_seg_boundary(struct device *dev) 152 { 153 return dev->dma_parms ? 154 dev->dma_parms->segment_boundary_mask : 0xffffffff; 155 } 156 157 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) 158 { 159 if (dev->dma_parms) { 160 dev->dma_parms->segment_boundary_mask = mask; 161 return 0; 162 } else 163 return -EIO; 164 } 165 166 /* flags for the coherent memory api */ 167 #define DMA_MEMORY_MAP 0x01 168 #define DMA_MEMORY_IO 0x02 169 #define DMA_MEMORY_INCLUDES_CHILDREN 0x04 170 #define DMA_MEMORY_EXCLUSIVE 0x08 171 172 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 173 static inline int 174 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 175 dma_addr_t device_addr, size_t size, int flags) 176 { 177 return 0; 178 } 179 180 static inline void 181 dma_release_declared_memory(struct device *dev) 182 { 183 } 184 185 static inline void * 186 dma_mark_declared_memory_occupied(struct device *dev, 187 dma_addr_t device_addr, size_t size) 188 { 189 return ERR_PTR(-EBUSY); 190 } 191 #endif 192 193 /* 194 * Managed DMA API 195 */ 196 extern void *dmam_alloc_coherent(struct device *dev, size_t size, 197 dma_addr_t *dma_handle, gfp_t gfp); 198 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, 199 dma_addr_t dma_handle); 200 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size, 201 dma_addr_t *dma_handle, gfp_t gfp); 202 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, 203 dma_addr_t dma_handle); 204 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 205 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 206 dma_addr_t device_addr, size_t size, 207 int flags); 208 extern void dmam_release_declared_memory(struct device *dev); 209 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 210 static inline int dmam_declare_coherent_memory(struct device *dev, 211 dma_addr_t bus_addr, dma_addr_t device_addr, 212 size_t size, gfp_t gfp) 213 { 214 return 0; 215 } 216 217 static inline void dmam_release_declared_memory(struct device *dev) 218 { 219 } 220 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 221 222 #ifndef CONFIG_HAVE_DMA_ATTRS 223 struct dma_attrs; 224 225 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \ 226 dma_map_single(dev, cpu_addr, size, dir) 227 228 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ 229 dma_unmap_single(dev, dma_addr, size, dir) 230 231 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ 232 dma_map_sg(dev, sgl, nents, dir) 233 234 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ 235 dma_unmap_sg(dev, sgl, nents, dir) 236 237 #endif /* CONFIG_HAVE_DMA_ATTRS */ 238 239 #endif 240