linux-kernel - Re: [PATCH v2 73/76] ARC: [Review] Multi-platform image #6: cpu-to-dma-addr optional

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Date:	Fri, 18 Jan 2013 15:07:32 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 73/76] ARC: [Review] Multi-platform image #6: cpu-to-dma-addr optional

On Friday 18 January 2013, Vineet Gupta wrote:
> 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-AHM 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@...opsys.com>
> Cc: Arnd Bergmann <arnd@...db.de>

Acked-by: Arnd Bergmann <arnd@...db.de>
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