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#ifndef DMA_COHERENT_H #define DMA_COHERENT_H #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT /* * These three functions are only for dma allocator. * Don't use them in device drivers. */ int dma_alloc_from_coherent(struct device *dev, ssize_t size, dma_addr_t *dma_handle, void **ret); int dma_release_from_coherent(struct device *dev, int order, void *vaddr); int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, size_t size, int *ret); /* * Standard interface */ #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags); void dma_release_declared_memory(struct device *dev); void *dma_mark_declared_memory_occupied(struct device *dev, dma_addr_t device_addr, size_t size); #else #define dma_alloc_from_coherent(dev, size, handle, ret) (0) #define dma_release_from_coherent(dev, order, vaddr) (0) #define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0) #endif #endif