include/linux/dma-mapping.h

   1 #ifndef _ASM_LINUX_DMA_MAPPING_H
   2 #define _ASM_LINUX_DMA_MAPPING_H
   3
   4 #include <linux/device.h>
   5 #include <linux/err.h>
   6
   7 /* These definitions mirror those in pci.h, so they can be used
   8  * interchangeably with their PCI_ counterparts */
   9 enum dma_data_direction {
  10         DMA_BIDIRECTIONAL = 0,
  11         DMA_TO_DEVICE = 1,
  12         DMA_FROM_DEVICE = 2,
  13         DMA_NONE = 3,
  14 };
  15
  16 #define DMA_64BIT_MASK  0xffffffffffffffffULL
  17 #define DMA_48BIT_MASK  0x0000ffffffffffffULL
  18 #define DMA_40BIT_MASK  0x000000ffffffffffULL
  19 #define DMA_39BIT_MASK  0x0000007fffffffffULL
  20 #define DMA_32BIT_MASK  0x00000000ffffffffULL
  21 #define DMA_31BIT_MASK  0x000000007fffffffULL
  22 #define DMA_30BIT_MASK  0x000000003fffffffULL
  23 #define DMA_29BIT_MASK  0x000000001fffffffULL
  24 #define DMA_28BIT_MASK  0x000000000fffffffULL
  25 #define DMA_24BIT_MASK  0x0000000000ffffffULL
  26
  27 #define DMA_MASK_NONE   0x0ULL
  28
  29 static inline int valid_dma_direction(int dma_direction)
  30 {
  31         return ((dma_direction == DMA_BIDIRECTIONAL) ||
  32                 (dma_direction == DMA_TO_DEVICE) ||
  33                 (dma_direction == DMA_FROM_DEVICE));
  34 }
  35
  36 static inline int is_device_dma_capable(struct device *dev)
  37 {
  38         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
  39 }
  40
  41 #ifdef CONFIG_HAS_DMA
  42 #include <asm/dma-mapping.h>
  43 #else
  44 #include <asm-generic/dma-mapping-broken.h>
  45 #endif
  46
  47 /* Backwards compat, remove in 2.7.x */
  48 #define dma_sync_single         dma_sync_single_for_cpu
  49 #define dma_sync_sg             dma_sync_sg_for_cpu
  50
  51 extern u64 dma_get_required_mask(struct device *dev);
  52
  53 /* flags for the coherent memory api */
  54 #define DMA_MEMORY_MAP                  0x01
  55 #define DMA_MEMORY_IO                   0x02
  56 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
  57 #define DMA_MEMORY_EXCLUSIVE            0x08
  58
  59 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  60 static inline int
  61 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  62                             dma_addr_t device_addr, size_t size, int flags)
  63 {
  64         return 0;
  65 }
  66
  67 static inline void
  68 dma_release_declared_memory(struct device *dev)
  69 {
  70 }
  71
  72 static inline void *
  73 dma_mark_declared_memory_occupied(struct device *dev,
  74                                   dma_addr_t device_addr, size_t size)
  75 {
  76         return ERR_PTR(-EBUSY);
  77 }
  78 #endif
  79
  80 /*
  81  * Managed DMA API
  82  */
  83 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
  84                                  dma_addr_t *dma_handle, gfp_t gfp);
  85 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
  86                                dma_addr_t dma_handle);
  87 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
  88                                     dma_addr_t *dma_handle, gfp_t gfp);
  89 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
  90                                   dma_addr_t dma_handle);
  91 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  92 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  93                                         dma_addr_t device_addr, size_t size,
  94                                         int flags);
  95 extern void dmam_release_declared_memory(struct device *dev);
  96 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
  97 static inline int dmam_declare_coherent_memory(struct device *dev,
  98                                 dma_addr_t bus_addr, dma_addr_t device_addr,
  99                                 size_t size, gfp_t gfp)
 100 {
 101         return 0;
 102 }
 103
 104 static inline void dmam_release_declared_memory(struct device *dev)
 105 {
 106 }
 107 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 108
 109 #endif