include/linux/dma-mapping.h

   1 #ifndef _LINUX_DMA_MAPPING_H
   2 #define _LINUX_DMA_MAPPING_H
   3
   4 #include <linux/string.h>
   5 #include <linux/device.h>
   6 #include <linux/err.h>
   7 #include <linux/dma-attrs.h>
   8 #include <linux/dma-direction.h>
   9 #include <linux/scatterlist.h>
  10
  11 struct dma_map_ops {
  12         void* (*alloc)(struct device *dev, size_t size,
  13                                 dma_addr_t *dma_handle, gfp_t gfp,
  14                                 struct dma_attrs *attrs);
  15         void (*free)(struct device *dev, size_t size,
  16                               void *vaddr, dma_addr_t dma_handle,
  17                               struct dma_attrs *attrs);
  18         int (*mmap)(struct device *, struct vm_area_struct *,
  19                           void *, dma_addr_t, size_t, struct dma_attrs *attrs);
  20
  21         int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
  22                            dma_addr_t, size_t, struct dma_attrs *attrs);
  23
  24         dma_addr_t (*map_page)(struct device *dev, struct page *page,
  25                                unsigned long offset, size_t size,
  26                                enum dma_data_direction dir,
  27                                struct dma_attrs *attrs);
  28         void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
  29                            size_t size, enum dma_data_direction dir,
  30                            struct dma_attrs *attrs);
  31         int (*map_sg)(struct device *dev, struct scatterlist *sg,
  32                       int nents, enum dma_data_direction dir,
  33                       struct dma_attrs *attrs);
  34         void (*unmap_sg)(struct device *dev,
  35                          struct scatterlist *sg, int nents,
  36                          enum dma_data_direction dir,
  37                          struct dma_attrs *attrs);
  38         void (*sync_single_for_cpu)(struct device *dev,
  39                                     dma_addr_t dma_handle, size_t size,
  40                                     enum dma_data_direction dir);
  41         void (*sync_single_for_device)(struct device *dev,
  42                                        dma_addr_t dma_handle, size_t size,
  43                                        enum dma_data_direction dir);
  44         void (*sync_sg_for_cpu)(struct device *dev,
  45                                 struct scatterlist *sg, int nents,
  46                                 enum dma_data_direction dir);
  47         void (*sync_sg_for_device)(struct device *dev,
  48                                    struct scatterlist *sg, int nents,
  49                                    enum dma_data_direction dir);
  50         int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
  51         int (*dma_supported)(struct device *dev, u64 mask);
  52         int (*set_dma_mask)(struct device *dev, u64 mask);
  53 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
  54         u64 (*get_required_mask)(struct device *dev);
  55 #endif
  56         int is_phys;
  57 };
  58
  59 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
  60
  61 #define DMA_MASK_NONE   0x0ULL
  62
  63 static inline int valid_dma_direction(int dma_direction)
  64 {
  65         return ((dma_direction == DMA_BIDIRECTIONAL) ||
  66                 (dma_direction == DMA_TO_DEVICE) ||
  67                 (dma_direction == DMA_FROM_DEVICE));
  68 }
  69
  70 static inline int is_device_dma_capable(struct device *dev)
  71 {
  72         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
  73 }
  74
  75 #ifdef CONFIG_HAS_DMA
  76 #include <asm/dma-mapping.h>
  77 #else
  78 #include <asm-generic/dma-mapping-broken.h>
  79 #endif
  80
  81 static inline u64 dma_get_mask(struct device *dev)
  82 {
  83         if (dev && dev->dma_mask && *dev->dma_mask)
  84                 return *dev->dma_mask;
  85         return DMA_BIT_MASK(32);
  86 }
  87
  88 #ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
  89 int dma_set_coherent_mask(struct device *dev, u64 mask);
  90 #else
  91 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
  92 {
  93         if (!dma_supported(dev, mask))
  94                 return -EIO;
  95         dev->coherent_dma_mask = mask;
  96         return 0;
  97 }
  98 #endif
  99
 100 /*
 101  * Set both the DMA mask and the coherent DMA mask to the same thing.
 102  * Note that we don't check the return value from dma_set_coherent_mask()
 103  * as the DMA API guarantees that the coherent DMA mask can be set to
 104  * the same or smaller than the streaming DMA mask.
 105  */
 106 static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
 107 {
 108         int rc = dma_set_mask(dev, mask);
 109         if (rc == 0)
 110                 dma_set_coherent_mask(dev, mask);
 111         return rc;
 112 }
 113
 114 /*
 115  * Similar to the above, except it deals with the case where the device
 116  * does not have dev->dma_mask appropriately setup.
 117  */
 118 static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
 119 {
 120         dev->dma_mask = &dev->coherent_dma_mask;
 121         return dma_set_mask_and_coherent(dev, mask);
 122 }
 123
 124 extern u64 dma_get_required_mask(struct device *dev);
 125
 126 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 127 {
 128         return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
 129 }
 130
 131 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 132                                                 unsigned int size)
 133 {
 134         if (dev->dma_parms) {
 135                 dev->dma_parms->max_segment_size = size;
 136                 return 0;
 137         } else
 138                 return -EIO;
 139 }
 140
 141 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 142 {
 143         return dev->dma_parms ?
 144                 dev->dma_parms->segment_boundary_mask : 0xffffffff;
 145 }
 146
 147 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 148 {
 149         if (dev->dma_parms) {
 150                 dev->dma_parms->segment_boundary_mask = mask;
 151                 return 0;
 152         } else
 153                 return -EIO;
 154 }
 155
 156 #ifndef dma_max_pfn
 157 static inline unsigned long dma_max_pfn(struct device *dev)
 158 {
 159         return *dev->dma_mask >> PAGE_SHIFT;
 160 }
 161 #endif
 162
 163 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 164                                         dma_addr_t *dma_handle, gfp_t flag)
 165 {
 166         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 167                                        flag | __GFP_ZERO);
 168         return ret;
 169 }
 170
 171 #ifdef CONFIG_HAS_DMA
 172 static inline int dma_get_cache_alignment(void)
 173 {
 174 #ifdef ARCH_DMA_MINALIGN
 175         return ARCH_DMA_MINALIGN;
 176 #endif
 177         return 1;
 178 }
 179 #endif
 180
 181 /* flags for the coherent memory api */
 182 #define DMA_MEMORY_MAP                  0x01
 183 #define DMA_MEMORY_IO                   0x02
 184 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
 185 #define DMA_MEMORY_EXCLUSIVE            0x08
 186
 187 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 188 static inline int
 189 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 190                             dma_addr_t device_addr, size_t size, int flags)
 191 {
 192         return 0;
 193 }
 194
 195 static inline void
 196 dma_release_declared_memory(struct device *dev)
 197 {
 198 }
 199
 200 static inline void *
 201 dma_mark_declared_memory_occupied(struct device *dev,
 202                                   dma_addr_t device_addr, size_t size)
 203 {
 204         return ERR_PTR(-EBUSY);
 205 }
 206 #endif
 207
 208 /*
 209  * Managed DMA API
 210  */
 211 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 212                                  dma_addr_t *dma_handle, gfp_t gfp);
 213 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 214                                dma_addr_t dma_handle);
 215 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
 216                                     dma_addr_t *dma_handle, gfp_t gfp);
 217 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 218                                   dma_addr_t dma_handle);
 219 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 220 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 221                                         dma_addr_t device_addr, size_t size,
 222                                         int flags);
 223 extern void dmam_release_declared_memory(struct device *dev);
 224 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 225 static inline int dmam_declare_coherent_memory(struct device *dev,
 226                                 dma_addr_t bus_addr, dma_addr_t device_addr,
 227                                 size_t size, gfp_t gfp)
 228 {
 229         return 0;
 230 }
 231
 232 static inline void dmam_release_declared_memory(struct device *dev)
 233 {
 234 }
 235 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 236
 237 #ifndef CONFIG_HAVE_DMA_ATTRS
 238 struct dma_attrs;
 239
 240 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
 241         dma_map_single(dev, cpu_addr, size, dir)
 242
 243 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
 244         dma_unmap_single(dev, dma_addr, size, dir)
 245
 246 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
 247         dma_map_sg(dev, sgl, nents, dir)
 248
 249 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
 250         dma_unmap_sg(dev, sgl, nents, dir)
 251
 252 #endif /* CONFIG_HAVE_DMA_ATTRS */
 253
 254 #ifdef CONFIG_NEED_DMA_MAP_STATE
 255 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 256 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 257 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 258 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 259 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 260 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 261 #else
 262 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 263 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 264 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 265 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 266 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 267 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 268 #endif
 269
 270 #endif