linux/include/linux/dma-mapping.h
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   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
  11struct 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
  63static 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
  70static 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
  81static 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
  89int dma_set_coherent_mask(struct device *dev, u64 mask);
  90#else
  91static 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
 100extern u64 dma_get_required_mask(struct device *dev);
 101
 102static 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
 107static 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
 117static 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
 123static 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
 132static 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, flag);
 136        if (ret)
 137                memset(ret, 0, size);
 138        return ret;
 139}
 140
 141#ifdef CONFIG_HAS_DMA
 142static inline int dma_get_cache_alignment(void)
 143{
 144#ifdef ARCH_DMA_MINALIGN
 145        return ARCH_DMA_MINALIGN;
 146#endif
 147        return 1;
 148}
 149#endif
 150
 151/* flags for the coherent memory api */
 152#define DMA_MEMORY_MAP                  0x01
 153#define DMA_MEMORY_IO                   0x02
 154#define DMA_MEMORY_INCLUDES_CHILDREN    0x04
 155#define DMA_MEMORY_EXCLUSIVE            0x08
 156
 157#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 158static inline int
 159dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 160                            dma_addr_t device_addr, size_t size, int flags)
 161{
 162        return 0;
 163}
 164
 165static inline void
 166dma_release_declared_memory(struct device *dev)
 167{
 168}
 169
 170static inline void *
 171dma_mark_declared_memory_occupied(struct device *dev,
 172                                  dma_addr_t device_addr, size_t size)
 173{
 174        return ERR_PTR(-EBUSY);
 175}
 176#endif
 177
 178/*
 179 * Managed DMA API
 180 */
 181extern void *dmam_alloc_coherent(struct device *dev, size_t size,
 182                                 dma_addr_t *dma_handle, gfp_t gfp);
 183extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
 184                               dma_addr_t dma_handle);
 185extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
 186                                    dma_addr_t *dma_handle, gfp_t gfp);
 187extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
 188                                  dma_addr_t dma_handle);
 189#ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
 190extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 191                                        dma_addr_t device_addr, size_t size,
 192                                        int flags);
 193extern void dmam_release_declared_memory(struct device *dev);
 194#else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 195static inline int dmam_declare_coherent_memory(struct device *dev,
 196                                dma_addr_t bus_addr, dma_addr_t device_addr,
 197                                size_t size, gfp_t gfp)
 198{
 199        return 0;
 200}
 201
 202static inline void dmam_release_declared_memory(struct device *dev)
 203{
 204}
 205#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 206
 207#ifndef CONFIG_HAVE_DMA_ATTRS
 208struct dma_attrs;
 209
 210#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
 211        dma_map_single(dev, cpu_addr, size, dir)
 212
 213#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
 214        dma_unmap_single(dev, dma_addr, size, dir)
 215
 216#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
 217        dma_map_sg(dev, sgl, nents, dir)
 218
 219#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
 220        dma_unmap_sg(dev, sgl, nents, dir)
 221
 222#endif /* CONFIG_HAVE_DMA_ATTRS */
 223
 224#ifdef CONFIG_NEED_DMA_MAP_STATE
 225#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME
 226#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME
 227#define dma_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
 228#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
 229#define dma_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
 230#define dma_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
 231#else
 232#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
 233#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
 234#define dma_unmap_addr(PTR, ADDR_NAME)           (0)
 235#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
 236#define dma_unmap_len(PTR, LEN_NAME)             (0)
 237#define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
 238#endif
 239
 240#endif
 241
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