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| author | Dmitry Baryshkov <dbaryshkov@gmail.com> | 2008-06-29 14:18:46 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-30 14:51:05 +0400 |
| commit | ee7e5516be4f2107535ad5a3d47d9c79f93661a2 (patch) | |
| tree | 57bdb330864036d6241deb8e69f351ee5ee01adb /include/asm-generic | |
| parent | 543cf4cb3fe6f6cae3651ba918b9c56200b257d0 (diff) | |
| download | linux-ee7e5516be4f2107535ad5a3d47d9c79f93661a2.tar.xz | |
generic: per-device coherent dma allocator
Currently x86_32, sh and cris-v32 provide per-device coherent dma
memory allocator.
However their implementation is nearly identical. Refactor out
common code to be reused by them.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/dma-coherent.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/asm-generic/dma-coherent.h b/include/asm-generic/dma-coherent.h new file mode 100644 index 000000000000..85a3ffaa0242 --- /dev/null +++ b/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 two 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); + +/* + * Standard interface + */ +#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY +extern int +dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, + dma_addr_t device_addr, size_t size, int flags); + +extern void +dma_release_declared_memory(struct device *dev); + +extern 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) +#endif + +#endif |