include/linux/dma-mapping.h

   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