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 /*
  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_BIT_MASK(32);
 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