#ifndef _ASM_LINUX_DMA_MAPPING_H
  #define _ASM_LINUX_DMA_MAPPING_H
  
  #include <linux/device.h>
  #include <linux/err.h>
  
  /* These definitions mirror those in pci.h, so they can be used
   * interchangeably with their PCI_ counterparts */
  enum dma_data_direction {
  	DMA_BIDIRECTIONAL = 0,
  	DMA_TO_DEVICE = 1,
  	DMA_FROM_DEVICE = 2,
  	DMA_NONE = 3,
  };
  
  #define DMA_64BIT_MASK	0xffffffffffffffffULL

  #define DMA_48BIT_MASK	0x0000ffffffffffffULL

  #define DMA_40BIT_MASK	0x000000ffffffffffULL
  #define DMA_39BIT_MASK	0x0000007fffffffffULL

  #define DMA_32BIT_MASK	0x00000000ffffffffULL

  #define DMA_31BIT_MASK	0x000000007fffffffULL
  #define DMA_30BIT_MASK	0x000000003fffffffULL
  #define DMA_29BIT_MASK	0x000000001fffffffULL

  #define DMA_28BIT_MASK	0x000000000fffffffULL

  #define DMA_24BIT_MASK	0x0000000000ffffffULL

  static inline int valid_dma_direction(int dma_direction)
  {
  	return ((dma_direction == DMA_BIDIRECTIONAL) ||
  		(dma_direction == DMA_TO_DEVICE) ||
  		(dma_direction == DMA_FROM_DEVICE));
  }

  #ifdef CONFIG_HAS_DMA

  #include <asm/dma-mapping.h>

  #else
  #include <asm-generic/dma-mapping-broken.h>
  #endif

  
  /* Backwards compat, remove in 2.7.x */
  #define dma_sync_single		dma_sync_single_for_cpu
  #define dma_sync_sg		dma_sync_sg_for_cpu
  
  extern u64 dma_get_required_mask(struct device *dev);
  
  /* flags for the coherent memory api */
  #define	DMA_MEMORY_MAP			0x01
  #define DMA_MEMORY_IO			0x02
  #define DMA_MEMORY_INCLUDES_CHILDREN	0x04
  #define DMA_MEMORY_EXCLUSIVE		0x08
  
  #ifndef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  static inline int
  dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  			    dma_addr_t device_addr, size_t size, int flags)
  {
  	return 0;
  }
  
  static inline void
  dma_release_declared_memory(struct device *dev)
  {
  }
  
  static inline void *
  dma_mark_declared_memory_occupied(struct device *dev,
  				  dma_addr_t device_addr, size_t size)
  {
  	return ERR_PTR(-EBUSY);
  }
  #endif

  /*
   * Managed DMA API
   */
  extern void *dmam_alloc_coherent(struct device *dev, size_t size,
  				 dma_addr_t *dma_handle, gfp_t gfp);
  extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
  			       dma_addr_t dma_handle);
  extern void *dmam_alloc_noncoherent(struct device *dev, size_t size,
  				    dma_addr_t *dma_handle, gfp_t gfp);
  extern void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,
  				  dma_addr_t dma_handle);
  #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
  extern int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
  					dma_addr_t device_addr, size_t size,
  					int flags);
  extern void dmam_release_declared_memory(struct device *dev);
  #else /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
  static inline int dmam_declare_coherent_memory(struct device *dev,
  				dma_addr_t bus_addr, dma_addr_t device_addr,
  				size_t size, gfp_t gfp)
  {
  	return 0;
  }

  static inline void dmam_release_declared_memory(struct device *dev)
  {
  }
  #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */

  #endif