LXR linux/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 */
  11enum dma_data_direction {
  12        DMA_BIDIRECTIONAL = 0,
  13        DMA_TO_DEVICE = 1,
  14        DMA_FROM_DEVICE = 2,
  15        DMA_NONE = 3,
  16};
  17
  18struct 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 (*set_dma_mask)(struct device *dev, u64 mask);
  62        int is_phys;
  63};
  64
  65#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
  66
  67typedef u64 DMA_nnBIT_MASK __deprecated;
  68
  69/*
  70 * NOTE: do not use the below macros in new code and do not add new definitions
  71 * here.
  72 *
  73 * Instead, just open-code DMA_BIT_MASK(n) within your driver
  74 */
  75#define DMA_64BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(64)
  76#define DMA_48BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(48)
  77#define DMA_47BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(47)
  78#define DMA_40BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(40)
  79#define DMA_39BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(39)
  80#define DMA_35BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(35)
  81#define DMA_32BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(32)
  82#define DMA_31BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(31)
  83#define DMA_30BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(30)
  84#define DMA_29BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(29)
  85#define DMA_28BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(28)
  86#define DMA_24BIT_MASK  (DMA_nnBIT_MASK)DMA_BIT_MASK(24)
  87
  88#define DMA_MASK_NONE   0x0ULL
  89
  90static inline int valid_dma_direction(int dma_direction)
  91{
  92        return ((dma_direction == DMA_BIDIRECTIONAL) ||
  93                (dma_direction == DMA_TO_DEVICE) ||
  94                (dma_direction == DMA_FROM_DEVICE));
  95}
  96
  97static inline int is_device_dma_capable(struct device *dev)
  98{
  99        return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
 100}
 101
 102#ifdef CONFIG_HAS_DMA
 103#include <asm/dma-mapping.h>
 104#else
 105#include <asm-generic/dma-mapping-broken.h>
 106#endif
 107
 108/* for backwards compatibility, removed soon */
 109static inline void __deprecated dma_sync_single(struct device *dev,
 110                                                dma_addr_t addr, size_t size,
 111                                                enum dma_data_direction dir)
 112{
 113        dma_sync_single_for_cpu(dev, addr, size, dir);
 114}
 115
 116static inline void __deprecated dma_sync_sg(struct device *dev,
 117                                            struct scatterlist *sg, int nelems,
 118                                            enum dma_data_direction dir)
 119{
 120        dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 121}
 122
 123static inline u64 dma_get_mask(struct device *dev)
 124{
 125        if (dev && dev->dma_mask && *dev->dma_mask)
 126                return *dev->dma_mask;
 127        return DMA_BIT_MASK(32);
 128}
 129
 130extern u64 dma_get_required_mask(struct device *dev);
 131
 132static inline unsigned int dma_get_max_seg_size(struct device *dev)
 133{
 134        return dev->dma_parms ? dev->dma_parms->max_segment_size : 65536;
 135}
 136
 137static inline unsigned int dma_set_max_seg_size(struct device *dev,
 138                                                unsigned int size)
 139{
 140        if (dev->dma_parms) {
 141                dev->dma_parms->max_segment_size = size;
 142                return 0;
 143        } else
 144                return -EIO;
 145}
 146
 147static inline unsigned long dma_get_seg_boundary(struct device *dev)
 148{
 149        return dev->dma_parms ?
 150                dev->dma_parms->segment_boundary_mask : 0xffffffff;
 151}
 152
 153static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
 154{
 155        if (dev->dma_parms) {
 156                dev->dma_parms->segment_boundary_mask = mask;
 157                return 0;
 158        } else
 159                return -EIO;
 160}
 161
 162/* flags for the coherent memory api */
 163#define DMA_MEMORY_MAP                  0x01
 164#define DMA_MEMORY_IO                   0x02
 165#define DMA_MEMORY_INCLUDES_CHILDREN    0x04
 166#define DMA_MEMORY_EXCLUSIVE            0x08
 167
 168#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 169static inline int
 170dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 171                            dma_addr_t device_addr, size_t size, int flags)
 172{
 173        return 0;
 174}
 175
 176static inline void
 177dma_release_declared_memory(struct device *dev)
 178{
 179}
 180
 181static inline void *
 182dma_mark_declared_memory_occupied(struct device *dev,
 183                                  dma_addr_t device_addr, size_t size)
 184{
 185        return ERR_PTR(-EBUSY);
 186}
 187#endif
 188
 189/*
 190 * Managed DMA API
 191 */
 192extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 193                                 dma_addr_t *dma_handle, gfp_t gfp);
 194extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 195                               dma_addr_t dma_handle);
 196extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
 197                                    dma_addr_t *dma_handle, gfp_t gfp);
 198extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 199                                  dma_addr_t dma_handle);
 200#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 201extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 202                                        dma_addr_t device_addr, size_t size,
 203                                        int flags);
 204extern void dmam_release_declared_memory(struct device *dev);
 205#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 206static inline int dmam_declare_coherent_memory(struct device *dev,
 207                                dma_addr_t bus_addr, dma_addr_t device_addr,
 208                                size_t size, gfp_t gfp)
 209{
 210        return 0;
 211}
 212
 213static inline void dmam_release_declared_memory(struct device *dev)
 214{
 215}
 216#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 217
 218#ifndef CONFIG_HAVE_DMA_ATTRS
 219struct dma_attrs;
 220
 221#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
 222        dma_map_single(dev, cpu_addr, size, dir)
 223
 224#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
 225        dma_unmap_single(dev, dma_addr, size, dir)
 226
 227#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
 228        dma_map_sg(dev, sgl, nents, dir)
 229
 230#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
 231        dma_unmap_sg(dev, sgl, nents, dir)
 232
 233#endif /* CONFIG_HAVE_DMA_ATTRS */
 234
 235#endif
 236