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 /* 67 * NOTE: do not use the below macros in new code and do not add new definitions 68 * here. 69 * 70 * Instead, just open-code DMA_BIT_MASK(n) within your driver 71 */ 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) 84 85 #define DMA_MASK_NONE 0x0ULL 86 87 static inline int valid_dma_direction(int dma_direction) 88 { 89 return ((dma_direction == DMA_BIDIRECTIONAL) || 90 (dma_direction == DMA_TO_DEVICE) || 91 (dma_direction == DMA_FROM_DEVICE)); 92 } 93 94 static inline int is_device_dma_capable(struct device *dev) 95 { 96 return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE; 97 } 98 99 static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size) 100 { 101 return addr + size <= mask; 102 } 103 104 #ifdef CONFIG_HAS_DMA 105 #include <asm/dma-mapping.h> 106 #else 107 #include <asm-generic/dma-mapping-broken.h> 108 #endif 109 110 /* 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 113 114 static inline u64 dma_get_mask(struct device *dev) 115 { 116 if (dev && dev->dma_mask && *dev->dma_mask) 117 return *dev->dma_mask; 118 return DMA_32BIT_MASK; 119 } 120 121 extern u64 dma_get_required_mask(struct device *dev); 122 123 static inline unsigned int dma_get_max_seg_size(struct device *dev) 124 { 125 return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536; 126 } 127 128 static inline unsigned int dma_set_max_seg_size(struct device *dev, 129 unsigned int size) 130 { 131 if (dev->dma_parms) { 132 dev->dma_parms->max_segment_size = size; 133 return 0; 134 } else 135 return -EIO; 136 } 137 138 static inline unsigned long dma_get_seg_boundary(struct device *dev) 139 { 140 return dev->dma_parms ? 141 dev->dma_parms->segment_boundary_mask : 0xffffffff; 142 } 143 144 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask) 145 { 146 if (dev->dma_parms) { 147 dev->dma_parms->segment_boundary_mask = mask; 148 return 0; 149 } else 150 return -EIO; 151 } 152 153 /* 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 158 159 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 160 static inline int 161 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 162 dma_addr_t device_addr, size_t size, int flags) 163 { 164 return 0; 165 } 166 167 static inline void 168 dma_release_declared_memory(struct device *dev) 169 { 170 } 171 172 static inline void * 173 dma_mark_declared_memory_occupied(struct device *dev, 174 dma_addr_t device_addr, size_t size) 175 { 176 return ERR_PTR(-EBUSY); 177 } 178 #endif 179 180 /* 181 * Managed DMA API 182 */ 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, 194 int flags); 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) 200 { 201 return 0; 202 } 203 204 static inline void dmam_release_declared_memory(struct device *dev) 205 { 206 } 207 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ 208 209 #ifndef CONFIG_HAVE_DMA_ATTRS 210 struct dma_attrs; 211 212 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \ 213 dma_map_single(dev, cpu_addr, size, dir) 214 215 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \ 216 dma_unmap_single(dev, dma_addr, size, dir) 217 218 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \ 219 dma_map_sg(dev, sgl, nents, dir) 220 221 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ 222 dma_unmap_sg(dev, sgl, nents, dir) 223 224 #endif /* CONFIG_HAVE_DMA_ATTRS */ 225 226 #endif 227