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authorCatalin Marinas <catalin.marinas@arm.com>2010-05-07 16:26:24 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-05-08 10:44:30 +0100
commitf4d6477f7f073b99220386d62f5bf54bec3482cc (patch)
tree4c6a13a762f54bfd30550a70226268edcb9d38a7 /arch/arm/mach-dove
parentb5a07faadeb4e0cfd6dcee359e501d4755cab875 (diff)
downloadblackbird-op-linux-f4d6477f7f073b99220386d62f5bf54bec3482cc.tar.gz
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ARM: 6111/1: Implement read/write for ownership in the ARMv6 DMA cache ops
The Snoop Control Unit on the ARM11MPCore hardware does not detect the cache operations and the dma_cache_maint*() functions may leave stale cache entries on other CPUs. The solution implemented in this patch performs a Read or Write For Ownership in the ARMv6 DMA cache maintenance functions. These LDR/STR instructions change the cache line state to shared or exclusive so that the cache maintenance operation has the desired effect. Tested-by: George G. Davis <gdavis@mvista.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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