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common: add dma_mmap_from_coherent() function

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Add a common helper for dma-mapping core for mapping a coherent buffer
to userspace.

Reported-by: Subash Patel <subashrp@gmail.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Tested-By: Subash Patel <subash.ramaswamy@linaro.org>
This commit is contained in:
Marek Szyprowski
2012-03-23 13:05:14 +01:00
parent 76e10d158e
commit bca0fa5f12
2 changed files with 45 additions and 1 deletions
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4
include/asm-generic/dma-coherent.h
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@@ -3,13 +3,15 @@
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
/*
* These two functions are only for dma allocator.
* 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
*/