LXR linux/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 */
   9enum 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_32BIT_MASK  0x00000000ffffffffULL
  18
  19#include <asm/dma-mapping.h>
  20
  21/* Backwards compat, remove in 2.7.x */
  22#define dma_sync_single         dma_sync_single_for_cpu
  23#define dma_sync_sg             dma_sync_sg_for_cpu
  24
  25extern u64 dma_get_required_mask(struct device *dev);
  26
  27/* flags for the coherent memory api */
  28#define DMA_MEMORY_MAP                  0x01
  29#define DMA_MEMORY_IO                   0x02
  30#define DMA_MEMORY_INCLUDES_CHILDREN    0x04
  31#define DMA_MEMORY_EXCLUSIVE            0x08
  32
  33#ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  34static inline int
  35dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  36                            dma_addr_t device_addr, size_t size, int flags)
  37{
  38        return 0;
  39}
  40
  41static inline void
  42dma_release_declared_memory(struct device *dev)
  43{
  44}
  45
  46static inline void *
  47dma_mark_declared_memory_occupied(struct device *dev,
  48                                  dma_addr_t device_addr, size_t size)
  49{
  50        return ERR_PTR(-EBUSY);
  51}
  52#endif
  53
  54#endif
  55
  56
  57