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Commit 9d86b89c authored by Masahiro Yamada's avatar Masahiro Yamada Committed by Peng Fan
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dma-mapping: move dma_map_(un)single() to <linux/dma-mapping.h>


The implementation of dma_map_single() and dma_unmap_single() is
exactly the same for all the architectures that support them.

Factor them out to <linux/dma-mapping.h>, and make all drivers to
include <linux/dma-mapping.h> instead of <asm/dma-mapping.h>.

If we need to differentiate them for some architectures, we can
move the generic definitions to <asm-generic/dma-mapping.h>.

Add some comments to the helpers. The concept is quite similar to
the DMA-API of Linux kernel. Drivers are agnostic about what is
going on behind the scene. Just call dma_map_single() before the
DMA, and dma_unmap_single() after it.

Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
parent 950c5968
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