linux-kernel - Re: [PATCH v3 4/7] of: configure the platform device dma parameters

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Message-ID: <CACRpkdaD6ZLFu7-tOeDRvKCAC6X6_W84Vsqs1o-xUzUZOjyvFQ@mail.gmail.com>
Date:	Thu, 29 May 2014 16:01:27 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v3 4/7] of: configure the platform device dma parameters

On Wed, May 28, 2014 at 4:04 PM, Santosh Shilimkar
<santosh.shilimkar@...com> wrote:
> On Wednesday 28 May 2014 09:32 AM, Linus Walleij wrote:

>>> I suspect what you want is
>>>
>>>         dma-ranges = <0x80000000 0 0x80000000>;
>>>
>>> to translate dma_addr_t 0x80000000-0xffffffff to phys_addr_t 0x0-0x7fffffff
>>> rather than phys_addr_t 0x800000000-0x87fffffff.
>>
> Interesting. Where does the ROM address space resides on integrator then considering
> address 0 is used for DMA.

The ROM is at physical address 0x20000000, don't ask me
why :-)

The RAM is typically at 0x00000000-0x0fffffff, on up to four parallell
tiles, i.e. up to four completely independent CPUs are booted off the
same ROM and using a set of shared peripherals.

>> Thanks, I'll fix up my patch.
>>
> Feel free to add my ack after the fixup if you need one.

Thanks!

Yours,
Linus Walleij
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