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 static inline int valid_dma_direction(int dma_direction)
  28 {
  29         return ((dma_direction == DMA_BIDIRECTIONAL) ||
  30                 (dma_direction == DMA_TO_DEVICE) ||
  31                 (dma_direction == DMA_FROM_DEVICE));
  32 }
  33
  34 #include <asm/dma-mapping.h>
  35
  36 /* Backwards compat, remove in 2.7.x */
  37 #define dma_sync_single         dma_sync_single_for_cpu
  38 #define dma_sync_sg             dma_sync_sg_for_cpu
  39
  40 extern u64 dma_get_required_mask(struct device *dev);
  41
  42 /* flags for the coherent memory api */
  43 #define DMA_MEMORY_MAP                  0x01
  44 #define DMA_MEMORY_IO                   0x02
  45 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
  46 #define DMA_MEMORY_EXCLUSIVE            0x08
  47
  48 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  49 static inline int
  50 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  51                             dma_addr_t device_addr, size_t size, int flags)
  52 {
  53         return 0;
  54 }
  55
  56 static inline void
  57 dma_release_declared_memory(struct device *dev)
  58 {
  59 }
  60
  61 static inline void *
  62 dma_mark_declared_memory_occupied(struct device *dev,
  63                                   dma_addr_t device_addr, size_t size)
  64 {
  65         return ERR_PTR(-EBUSY);
  66 }
  67 #endif
  68
  69 /*
  70  * Managed DMA API
  71  */
  72 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
  73                                  dma_addr_t *dma_handle, gfp_t gfp);
  74 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
  75                                dma_addr_t dma_handle);
  76 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
  77                                     dma_addr_t *dma_handle, gfp_t gfp);
  78 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
  79                                   dma_addr_t dma_handle);
  80 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  81 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  82                                         dma_addr_t device_addr, size_t size,
  83                                         int flags);
  84 extern void dmam_release_declared_memory(struct device *dev);
  85 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
  86 static inline int dmam_declare_coherent_memory(struct device *dev,
  87                                 dma_addr_t bus_addr, dma_addr_t device_addr,
  88                                 size_t size, gfp_t gfp)
  89 {
  90         return 0;
  91 }
  92
  93 static inline void dmam_release_declared_memory(struct device *dev)
  94 {
  95 }
  96 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
  97
  98 #endif