1 #ifndef DMA_COHERENT_H 2 #define DMA_COHERENT_H 3 4 #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT 5 /* 6 * These two functions are only for dma allocator. 7 * Don't use them in device drivers. 8 */ 9 int dma_alloc_from_coherent(struct device *dev, ssize_t size, 10 dma_addr_t *dma_handle, void **ret); 11 int dma_release_from_coherent(struct device *dev, int order, void *vaddr); 12 13 /* 14 * Standard interface 15 */ 16 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 17 extern int 18 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 19 dma_addr_t device_addr, size_t size, int flags); 20 21 extern void 22 dma_release_declared_memory(struct device *dev); 23 24 extern void * 25 dma_mark_declared_memory_occupied(struct device *dev, 26 dma_addr_t device_addr, size_t size); 27 #else 28 #define dma_alloc_from_coherent(dev, size, handle, ret) (0) 29 #define dma_release_from_coherent(dev, order, vaddr) (0) 30 #endif 31 32 #endif 33