1 #ifndef _ASM_GENERIC_DMA_MAPPING_H

     2 #define _ASM_GENERIC_DMA_MAPPING_H

     3 

     4 /* define the dma api to allow compilation but not linking of

     5  * dma dependent code.  Code that depends on the dma-mapping

     6  * API needs to set 'depends on HAS_DMA' in its Kconfig

     7  */

     8 

     9 struct scatterlist;

    10 

    11 extern void *

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

    13 		   gfp_t flag);

    14 

    15 extern void

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

    17 		    dma_addr_t dma_handle);

    18 

    19 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)

    20 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)

    21 

    22 extern dma_addr_t

    23 dma_map_single(struct device *dev, void *ptr, size_t size,

    24 	       enum dma_data_direction direction);

    25 

    26 extern void

    27 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,

    28 		 enum dma_data_direction direction);

    29 

    30 extern int

    31 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,

    32 	   enum dma_data_direction direction);

    33 

    34 extern void

    35 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,

    36 	     enum dma_data_direction direction);

    37 

    38 extern dma_addr_t

    39 dma_map_page(struct device *dev, struct page *page, unsigned long offset,

    40 	     size_t size, enum dma_data_direction direction);

    41 

    42 extern void

    43 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,

    44 	       enum dma_data_direction direction);

    45 

    46 extern void

    47 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,

    48 			enum dma_data_direction direction);

    49 

    50 extern void

    51 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,

    52 			      unsigned long offset, size_t size,

    53 			      enum dma_data_direction direction);

    54 

    55 extern void

    56 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,

    57 		    enum dma_data_direction direction);

    58 

    59 #define dma_sync_single_for_device dma_sync_single_for_cpu

    60 #define dma_sync_single_range_for_device dma_sync_single_range_for_cpu

    61 #define dma_sync_sg_for_device dma_sync_sg_for_cpu

    62 

    63 extern int

    64 dma_mapping_error(struct device *dev, dma_addr_t dma_addr);

    65 

    66 extern int

    67 dma_supported(struct device *dev, u64 mask);

    68 

    69 extern int

    70 dma_set_mask(struct device *dev, u64 mask);

    71 

    72 extern int

    73 dma_get_cache_alignment(void);

    74 

    75 extern int

    76 dma_is_consistent(struct device *dev, dma_addr_t dma_handle);

    77 

    78 extern void

    79 dma_cache_sync(struct device *dev, void *vaddr, size_t size,

    80 	       enum dma_data_direction direction);

    81 

    82 #endif /* _ASM_GENERIC_DMA_MAPPING_H */