diff options
Diffstat (limited to 'kernel/include/asm-generic/dma-coherent.h')
| -rw-r--r-- | kernel/include/asm-generic/dma-coherent.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/kernel/include/asm-generic/dma-coherent.h b/kernel/include/asm-generic/dma-coherent.h new file mode 100644 index 000000000..0297e5875 --- /dev/null +++ b/kernel/include/asm-generic/dma-coherent.h @@ -0,0 +1,32 @@ +#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 |