From: Vineet Gupta <vgupta@synopsys.com>
Date: Tue, 22 Jan 2013 11:23:57 +0000 (+0530)
Subject: ARC: [Review] Multi-platform image #6: cpu-to-dma-addr optional
X-Git-Tag: v3.9-rc1~25^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fc7943d29e9f6f5f6d4b111120b66ec86501673e;p=pandora-kernel.git

ARC: [Review] Multi-platform image #6: cpu-to-dma-addr optional

All the current platforms can work with 0x8000_0000 based dma_addr_t
since the Bus Bridges typically ignore the top bit (the only excpetion
was Angel4 PCI-AHB bridge which we no longer care for).
That way we don't need plat-specific cpu-addr to bus-addr conversion.

Hooks still provided - just in case a platform has an obscure device
which say needs 0 based bus address.

That way <asm/dma_mapping.h> no longer needs to unconditinally include
<plat/dma_addr.h>

Also verfied that on Angel4 board, other peripherals (IDE-disk / EMAC)
work fine with 0x8000_0000 based dma addresses.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
---

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