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 extern u64 dma_get_required_mask(struct device *dev);
 101
 102 static inline unsigned int dma_get_max_seg_size(struct device *dev)
 103 {
 104         return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
 105 }
 106
 107 static inline unsigned int dma_set_max_seg_size(struct device *dev,
 108                                                 unsigned int size)
 109 {
 110         if (dev->dma_parms) {
 111                 dev->dma_parms->max_segment_size = size;
 112                 return 0;
 113         } else
 114                 return -EIO;
 115 }
 116
 117 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 118 {
 119         return dev->dma_parms ?
 120                 dev->dma_parms->segment_boundary_mask : 0xffffffff;
 121 }
 122
 123 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 124 {
 125         if (dev->dma_parms) {
 126                 dev->dma_parms->segment_boundary_mask = mask;
 127                 return 0;
 128         } else
 129                 return -EIO;
 130 }
 131
 132 static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
 133                                         dma_addr_t *dma_handle, gfp_t flag)
 134 {
 135         void *ret = dma_alloc_coherent(dev, size, dma_handle,
 136                                        flag | __GFP_ZERO);
 137         return ret;
 138 }
 139
 140 #ifdef CONFIG_HAS_DMA
 141 static inline int dma_get_cache_alignment(void)
 142 {
 143 #ifdef ARCH_DMA_MINALIGN
 144         return ARCH_DMA_MINALIGN;
 145 #endif
 146         return 1;
 147 }
 148 #endif
 149
 150 /* flags for the coherent memory api */
 151 #define DMA_MEMORY_MAP                  0x01
 152 #define DMA_MEMORY_IO                   0x02
 153 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
 154 #define DMA_MEMORY_EXCLUSIVE            0x08
 155
 156 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 157 static inline int
 158 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 159                             dma_addr_t device_addr, size_t size, int flags)
 160 {
 161         return 0;
 162 }
 163
 164 static inline void
 165 dma_release_declared_memory(struct device *dev)
 166 {
 167 }
 168
 169 static inline void *
 170 dma_mark_declared_memory_occupied(struct device *dev,
 171                                   dma_addr_t device_addr, size_t size)
 172 {
 173         return ERR_PTR(-EBUSY);
 174 }
 175 #endif
 176
 177 /*
 178  * Managed DMA API
 179  */
 180 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 181                                  dma_addr_t *dma_handle, gfp_t gfp);
 182 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 183                                dma_addr_t dma_handle);
 184 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
 185                                     dma_addr_t *dma_handle, gfp_t gfp);
 186 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 187                                   dma_addr_t dma_handle);
 188 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 189 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 190                                         dma_addr_t device_addr, size_t size,
 191                                         int flags);
 192 extern void dmam_release_declared_memory(struct device *dev);
 193 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 194 static inline int dmam_declare_coherent_memory(struct device *dev,
 195                                 dma_addr_t bus_addr, dma_addr_t device_addr,
 196                                 size_t size, gfp_t gfp)
 197 {
 198         return 0;
 199 }
 200
 201 static inline void dmam_release_declared_memory(struct device *dev)
 202 {
 203 }
 204 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 205
 206 #ifndef CONFIG_HAVE_DMA_ATTRS
 207 struct dma_attrs;
 208
 209 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
 210         dma_map_single(dev, cpu_addr, size, dir)
 211
 212 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
 213         dma_unmap_single(dev, dma_addr, size, dir)
 214
 215 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
 216         dma_map_sg(dev, sgl, nents, dir)
 217
 218 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
 219         dma_unmap_sg(dev, sgl, nents, dir)
 220
 221 #endif /* CONFIG_HAVE_DMA_ATTRS */
 222
 223 #ifdef CONFIG_NEED_DMA_MAP_STATE
 224 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 225 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 226 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 227 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 228 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 229 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 230 #else
 231 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 232 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 233 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 234 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 235 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 236 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 237 #endif
 238
 239 #endif