#ifndef _ASM_GENERIC_DMA_MAPPING_H
  #define _ASM_GENERIC_DMA_MAPPING_H

  /* define the dma api to allow compilation but not linking of
   * dma dependent code.  Code that depends on the dma-mapping
   * API needs to set 'depends on HAS_DMA' in its Kconfig
   */

  struct scatterlist;
  
  extern void *

  dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,

  		   gfp_t flag);

  extern void

  dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,

  		    dma_addr_t dma_handle);

  static inline void *dma_alloc_attrs(struct device *dev, size_t size,
  				    dma_addr_t *dma_handle, gfp_t flag,
  				    struct dma_attrs *attrs)
  {
  	/* attrs is not supported and ignored */
  	return dma_alloc_coherent(dev, size, dma_handle, flag);
  }
  
  static inline void dma_free_attrs(struct device *dev, size_t size,
  				  void *cpu_addr, dma_addr_t dma_handle,
  				  struct dma_attrs *attrs)
  {
  	/* attrs is not supported and ignored */
  	dma_free_coherent(dev, size, cpu_addr, dma_handle);
  }

  #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
  #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)

  extern dma_addr_t
  dma_map_single(struct device *dev, void *ptr, size_t size,
  	       enum dma_data_direction direction);
  
  extern void
  dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  		 enum dma_data_direction direction);
  
  extern int
  dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
  	   enum dma_data_direction direction);
  
  extern void
  dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  	     enum dma_data_direction direction);
  
  extern dma_addr_t
  dma_map_page(struct device *dev, struct page *page, unsigned long offset,
  	     size_t size, enum dma_data_direction direction);
  
  extern void
  dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  	       enum dma_data_direction direction);
  
  extern void
  dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
  			enum dma_data_direction direction);
  
  extern void
  dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
  			      unsigned long offset, size_t size,
  			      enum dma_data_direction direction);
  
  extern void
  dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
  		    enum dma_data_direction direction);
  
  #define dma_sync_single_for_device dma_sync_single_for_cpu
  #define dma_sync_single_range_for_device dma_sync_single_range_for_cpu
  #define dma_sync_sg_for_device dma_sync_sg_for_cpu
  
  extern int

  dma_mapping_error(struct device *dev, dma_addr_t dma_addr);

  
  extern int
  dma_supported(struct device *dev, u64 mask);
  
  extern int
  dma_set_mask(struct device *dev, u64 mask);
  
  extern int
  dma_get_cache_alignment(void);

  extern void
  dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  	       enum dma_data_direction direction);

  #endif /* _ASM_GENERIC_DMA_MAPPING_H */