linux-kernel - Re: [PATCH] ARM: mmp: map sram as MT_MEMORY rather than MT

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Message-ID: <20111007190512.GL6324@atomide.com>
Date:	Fri, 7 Oct 2011 12:05:12 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Leo Yan <leoy@...vell.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Haojian Zhuang <hzhuang1@...vell.com>,
	Jon Nettleton <jon.nettleton@...il.com>,
	Eric Miao <eric.y.miao@...il.com>
Subject: Re: [PATCH] ARM: mmp: map sram as MT_MEMORY rather than MT_DEVICE

* Andres Salomon <dilinger@...ued.net> [110822 18:40]:
> On Tue, 23 Aug 2011 01:07:55 +0100
> Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> [...]
> > > @@ -87,7 +88,8 @@ static int __devinit sram_probe(struct
> > > platform_device *pdev) 
> > >  	info->sram_phys   = (phys_addr_t)res->start;
> > >  	info->sram_size   = resource_size(res);
> > > -	info->sram_virt   = ioremap(info->sram_phys,
> > > info->sram_size);
> > > +	info->sram_virt   = __arm_ioremap(info->sram_phys,
> > > info->sram_size,
> > > +					  MT_MEMORY);
> > 
> > Not a good idea fiddling about under the covers like that.  The reason
> > that MT_MEMORY is not in asm/io.h is to stop it being used like this -
> > MT_MEMORY etc are not meant for general purpose use.
> > 
> > It needs to be looked at properly rather than working behind the APIs,
> > and making my life a misery by doing so, preventing me from making
> > changes where necessary by this kind of back-door use.
> > 
> > I guess we need a new ioremap_xxx() variant to cope with this.
> 
> Something like ioremap_exec()?  I have no idea what the related MT_
> entry would be (as someone who's new to the ARM world, it's not
> entirely clear what the semantic distinctions are between the various
> MT_ entries).

Andres, care to ack this patch:

http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7126/1

Looks like that should do what you want. And after the related
SRAM/map_io fixes for omap, it really seems that we could have
a generic SRAM driver..

Regards,

Tony
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