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Lennert Buytenhek 23759dc643 [ARM] 3439/2: xsc3: add I/O coherency support ... Patch from Lennert Buytenhek This patch adds support for the I/O coherent cache available on the xsc3. The approach is to provide a simple API to determine whether the chipset supports coherency by calling arch_is_coherent() and then setting the appropriate system memory PTE and PMD bits. In addition, we call this API on dma_alloc_coherent() and dma_map_single() calls. A generic version exists that will compile out all the coherency-related code that is not needed on the majority of ARM systems. Note that we do not check for coherency in the dma_alloc_writecombine() function as that still requires a special PTE setting. We also don't touch dma_mmap_coherent() as that is a special ARM-only API that is by definition only used on non-coherent system. Signed-off-by: Deepak Saxena <dsaxena@plexity.net> Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>		19 years ago
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alpha	[PATCH] unexport get_wchan	19 years ago
arm	[ARM] 3439/2: xsc3: add I/O coherency support	19 years ago
arm26	[PATCH] unexport get_wchan	19 years ago
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x86_64	[PATCH] unexport get_wchan	19 years ago
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