ARM: 6111/1: Implement read/write for ownership in the ARMv6 DMA cache ops

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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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Catalin Marinas 2010-05-07 16:26:24 +01:00 • committed by Russell King

parent b5a07faade

commit f4d6477f7f

1 changed files with 13 additions and 4 deletions

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arch/arm/mm/cache-v6.S

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