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 void 76 dma_cache_sync(struct device *dev, void *vaddr, size_t size, 77 enum dma_data_direction direction); 78 79 #endif /* _ASM_GENERIC_DMA_MAPPING_H */ 80