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 #ifdef CONFIG_HAS_DMA
  35 #include <asm/dma-mapping.h>
  36 #else
  37 #include <asm-generic/dma-mapping-broken.h>
  38 #endif
  39
  40 /* Backwards compat, remove in 2.7.x */
  41 #define dma_sync_single         dma_sync_single_for_cpu
  42 #define dma_sync_sg             dma_sync_sg_for_cpu
  43
  44 extern u64 dma_get_required_mask(struct device *dev);
  45
  46 /* flags for the coherent memory api */
  47 #define DMA_MEMORY_MAP                  0x01
  48 #define DMA_MEMORY_IO                   0x02
  49 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
  50 #define DMA_MEMORY_EXCLUSIVE            0x08
  51
  52 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  53 static inline int
  54 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  55                             dma_addr_t device_addr, size_t size, int flags)
  56 {
  57         return 0;
  58 }
  59
  60 static inline void
  61 dma_release_declared_memory(struct device *dev)
  62 {
  63 }
  64
  65 static inline void *
  66 dma_mark_declared_memory_occupied(struct device *dev,
  67                                   dma_addr_t device_addr, size_t size)
  68 {
  69         return ERR_PTR(-EBUSY);
  70 }
  71 #endif
  72
  73 /*
  74  * Managed DMA API
  75  */
  76 extern void *dmam_alloc_coherent(struct device *dev, size_t size,
  77                                  dma_addr_t *dma_handle, gfp_t gfp);
  78 extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
  79                                dma_addr_t dma_handle);
  80 extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
  81                                     dma_addr_t *dma_handle, gfp_t gfp);
  82 extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
  83                                   dma_addr_t dma_handle);
  84 #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  85 extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  86                                         dma_addr_t device_addr, size_t size,
  87                                         int flags);
  88 extern void dmam_release_declared_memory(struct device *dev);
  89 #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
  90 static inline int dmam_declare_coherent_memory(struct device *dev,
  91                                 dma_addr_t bus_addr, dma_addr_t device_addr,
  92                                 size_t size, gfp_t gfp)
  93 {
  94         return 0;
  95 }
  96
  97 static inline void dmam_release_declared_memory(struct device *dev)
  98 {
  99 }
 100 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 101
 102 #endif