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_40BIT_MASK  0x000000ffffffffffULL
  18 #define DMA_39BIT_MASK  0x0000007fffffffffULL
  19 #define DMA_32BIT_MASK  0x00000000ffffffffULL
  20 #define DMA_31BIT_MASK  0x000000007fffffffULL
  21 #define DMA_30BIT_MASK  0x000000003fffffffULL
  22 #define DMA_29BIT_MASK  0x000000001fffffffULL
  23
  24 #include <asm/dma-mapping.h>
  25
  26 /* Backwards compat, remove in 2.7.x */
  27 #define dma_sync_single         dma_sync_single_for_cpu
  28 #define dma_sync_sg             dma_sync_sg_for_cpu
  29
  30 extern u64 dma_get_required_mask(struct device *dev);
  31
  32 /* flags for the coherent memory api */
  33 #define DMA_MEMORY_MAP                  0x01
  34 #define DMA_MEMORY_IO                   0x02
  35 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
  36 #define DMA_MEMORY_EXCLUSIVE            0x08
  37
  38 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  39 static inline int
  40 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  41                             dma_addr_t device_addr, size_t size, int flags)
  42 {
  43         return 0;
  44 }
  45
  46 static inline void
  47 dma_release_declared_memory(struct device *dev)
  48 {
  49 }
  50
  51 static inline void *
  52 dma_mark_declared_memory_occupied(struct device *dev,
  53                                   dma_addr_t device_addr, size_t size)
  54 {
  55         return ERR_PTR(-EBUSY);
  56 }
  57 #endif
  58
  59 #endif
  60
  61