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/dma-direction.h>
   8 #include <linux/scatterlist.h>
   9
  10 struct dma_map_ops {
  11         void* (*alloc_coherent)(struct device *dev, size_t size,
  12                                 dma_addr_t *dma_handle, gfp_t gfp);
  13         void (*free_coherent)(struct device *dev, size_t size,
  14                               void *vaddr, dma_addr_t dma_handle);
  15         dma_addr_t (*map_page)(struct device *dev, struct page *page,
  16                                unsigned long offset, size_t size,
  17                                enum dma_data_direction dir,
  18                                struct dma_attrs *attrs);
  19         void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
  20                            size_t size, enum dma_data_direction dir,
  21                            struct dma_attrs *attrs);
  22         int (*map_sg)(struct device *dev, struct scatterlist *sg,
  23                       int nents, enum dma_data_direction dir,
  24                       struct dma_attrs *attrs);
  25         void (*unmap_sg)(struct device *dev,
  26                          struct scatterlist *sg, int nents,
  27                          enum dma_data_direction dir,
  28                          struct dma_attrs *attrs);
  29         void (*sync_single_for_cpu)(struct device *dev,
  30                                     dma_addr_t dma_handle, size_t size,
  31                                     enum dma_data_direction dir);
  32         void (*sync_single_for_device)(struct device *dev,
  33                                        dma_addr_t dma_handle, size_t size,
  34                                        enum dma_data_direction dir);
  35         void (*sync_sg_for_cpu)(struct device *dev,
  36                                 struct scatterlist *sg, int nents,
  37                                 enum dma_data_direction dir);
  38         void (*sync_sg_for_device)(struct device *dev,
  39                                    struct scatterlist *sg, int nents,
  40                                    enum dma_data_direction dir);
  41         int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
  42         int (*dma_supported)(struct device *dev, u64 mask);
  43         int (*set_dma_mask)(struct device *dev, u64 mask);
  44         int is_phys;
  45 };
  46
  47 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
  48
  49 #define DMA_MASK_NONE   0x0ULL
  50
  51 static inline int valid_dma_direction(int dma_direction)
  52 {
  53         return ((dma_direction == DMA_BIDIRECTIONAL) ||
  54                 (dma_direction == DMA_TO_DEVICE) ||
  55                 (dma_direction == DMA_FROM_DEVICE));
  56 }
  57
  58 static inline int is_device_dma_capable(struct device *dev)
  59 {
  60         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
  61 }
  62
  63 #ifdef CONFIG_HAS_DMA
  64 #include <asm/dma-mapping.h>
  65 #else
  66 #include <asm-generic/dma-mapping-broken.h>
  67 #endif
  68
  69 static inline u64 dma_get_mask(struct device *dev)
  70 {
  71         if (dev && dev->dma_mask && *dev->dma_mask)
  72                 return *dev->dma_mask;
  73         return DMA_BIT_MASK(32);
  74 }
  75
  76 #ifdef ARCH_HAS_DMA_SET_COHERENT_MASK
  77 int dma_set_coherent_mask(struct device *dev, u64 mask);
  78 #else
  79 static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
  80 {
  81         if (!dma_supported(dev, mask))
  82                 return -EIO;
  83         dev->coherent_dma_mask = mask;
  84         return 0;
  85 }
  86 #endif
  87
  88 extern u64 dma_get_required_mask(struct device *dev);
  89
  90 static inline unsigned int dma_get_max_seg_size(struct device *dev)
  91 {
  92         return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
  93 }
  94
  95 static inline unsigned int dma_set_max_seg_size(struct device *dev,
  96                                                 unsigned int size)
  97 {
  98         if (dev->dma_parms) {
  99                 dev->dma_parms->max_segment_size = size;
 100                 return 0;
 101         } else
 102                 return -EIO;
 103 }
 104
 105 static inline unsigned long dma_get_seg_boundary(struct device *dev)
 106 {
 107         return dev->dma_parms ?
 108                 dev->dma_parms->segment_boundary_mask : 0xffffffff;
 109 }
 110
 111 static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 112 {
 113         if (dev->dma_parms) {
 114                 dev->dma_parms->segment_boundary_mask = mask;
 115                 return 0;
 116         } else
 117                 return -EIO;
 118 }
 119
 120 #ifdef CONFIG_HAS_DMA
 121 static inline int dma_get_cache_alignment(void)
 122 {
 123 #ifdef ARCH_DMA_MINALIGN
 124         return ARCH_DMA_MINALIGN;
 125 #endif
 126         return 1;
 127 }
 128 #endif
 129
 130 /* flags for the coherent memory api */
 131 #define DMA_MEMORY_MAP                  0x01
 132 #define DMA_MEMORY_IO                   0x02
 133 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
 134 #define DMA_MEMORY_EXCLUSIVE            0x08
 135
 136 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 137 static inline int
 138 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 139                             dma_addr_t device_addr, size_t size, int flags)
 140 {
 141         return 0;
 142 }
 143
 144 static inline void
 145 dma_release_declared_memory(struct device *dev)
 146 {
 147 }
 148
 149 static inline void *
 150 dma_mark_declared_memory_occupied(struct device *dev,
 151                                   dma_addr_t device_addr, size_t size)
 152 {
 153         return ERR_PTR(-EBUSY);
 154 }
 155 #endif
 156
 157 /*
 158  * Managed DMA API
 159  */
 160 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 161                                  dma_addr_t *dma_handle, gfp_t gfp);
 162 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 163                                dma_addr_t dma_handle);
 164 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
 165                                     dma_addr_t *dma_handle, gfp_t gfp);
 166 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 167                                   dma_addr_t dma_handle);
 168 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 169 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 170                                         dma_addr_t device_addr, size_t size,
 171                                         int flags);
 172 extern void dmam_release_declared_memory(struct device *dev);
 173 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 174 static inline int dmam_declare_coherent_memory(struct device *dev,
 175                                 dma_addr_t bus_addr, dma_addr_t device_addr,
 176                                 size_t size, gfp_t gfp)
 177 {
 178         return 0;
 179 }
 180
 181 static inline void dmam_release_declared_memory(struct device *dev)
 182 {
 183 }
 184 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 185
 186 #ifndef CONFIG_HAVE_DMA_ATTRS
 187 struct dma_attrs;
 188
 189 #define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
 190         dma_map_single(dev, cpu_addr, size, dir)
 191
 192 #define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
 193         dma_unmap_single(dev, dma_addr, size, dir)
 194
 195 #define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
 196         dma_map_sg(dev, sgl, nents, dir)
 197
 198 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
 199         dma_unmap_sg(dev, sgl, nents, dir)
 200
 201 #endif /* CONFIG_HAVE_DMA_ATTRS */
 202
 203 #ifdef CONFIG_NEED_DMA_MAP_STATE
 204 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 205 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 206 #define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 207 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 208 #define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 209 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 210 #else
 211 #define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 212 #define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 213 #define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 214 #define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 215 #define dma_unmap_len(PTR, LEN_NAME)             (0)
 216 #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 217 #endif
 218
 219 #endif