From mboxrd@z Thu Jan 1 00:00:00 1970 From: tony@atomide.com (Tony Lindgren) Date: Fri, 7 Oct 2011 12:05:12 -0700 Subject: [PATCH] ARM: mmp: map sram as MT_MEMORY rather than MT_DEVICE In-Reply-To: <20110822191335.3dbe99b9@debxo> References: <1313377794-26721-1-git-send-email-leoy@marvell.com> <1313377794-26721-2-git-send-email-leoy@marvell.com> <20110822164740.5682541b@queued.net> <20110823000755.GE3895@n2100.arm.linux.org.uk> <20110822191335.3dbe99b9@debxo> Message-ID: <20111007190512.GL6324@atomide.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org * Andres Salomon [110822 18:40]: > On Tue, 23 Aug 2011 01:07:55 +0100 > Russell King - ARM Linux 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