tree f33ea6faa4f8d9409098654354548fa28c7b41ad
parent acaac256b3a14a09ab278409a72d119f2d75b02b
author Russell King <rmk+kernel@arm.linux.org.uk> 1258751203 +0000
committer Russell King <rmk+kernel@arm.linux.org.uk> 1259084496 +0000

ARM: dma-mapping: switch ARMv7 DMA mappings to retain 'memory' attribute

On ARMv7, it is invalid to map the same physical address multiple times
with different memory types.  Since system RAM is already mapped as
'memory', subsequent remapping of it must retain this attribute.

However, DMA memory maps it as "strongly ordered".  Fix this by introducing
'pgprot_dmacoherent()' which provides the necessary page table bits for
DMA mappings.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>