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 #define DMA_28BIT_MASK  0x000000000fffffffULL
  24 #define DMA_24BIT_MASK 0x0000000000ffffffULL
  25
  26 #include <asm/dma-mapping.h>
  27
  28 /* Backwards compat, remove in 2.7.x */
  29 #define dma_sync_single         dma_sync_single_for_cpu
  30 #define dma_sync_sg             dma_sync_sg_for_cpu
  31
  32 extern u64 dma_get_required_mask(struct device *dev);
  33
  34 /* flags for the coherent memory api */
  35 #define DMA_MEMORY_MAP                  0x01
  36 #define DMA_MEMORY_IO                   0x02
  37 #define DMA_MEMORY_INCLUDES_CHILDREN    0x04
  38 #define DMA_MEMORY_EXCLUSIVE            0x08
  39
  40 #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  41 static inline int
  42 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  43                             dma_addr_t device_addr, size_t size, int flags)
  44 {
  45         return 0;
  46 }
  47
  48 static inline void
  49 dma_release_declared_memory(struct device *dev)
  50 {
  51 }
  52
  53 static inline void *
  54 dma_mark_declared_memory_occupied(struct device *dev,
  55                                   dma_addr_t device_addr, size_t size)
  56 {
  57         return ERR_PTR(-EBUSY);
  58 }
  59 #endif
  60
  61 #endif
  62
  63