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