linux-kernel - Re: [PATCH 6/6] mfd: Differentiate between u8500 and u9540 TCDM address mapping

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 11 Oct 2012 09:59:51 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linus.walleij@...ricsson.com
Subject: Re: [PATCH 6/6] mfd: Differentiate between u8500 and u9540 TCDM
 address mapping

On Wed, 10 Oct 2012, Arnd Bergmann wrote:

> On Wednesday 10 October 2012, Lee Jones wrote:
> > @@ -2688,7 +2688,11 @@ void __init db8500_prcmu_early_init(void)
> >                         iounmap(tcpm_base);
> >                 }
> >  
> > -               tcdm_base = __io_address(U8500_PRCMU_TCDM_BASE);
> > +               if (cpu_is_u9540())
> > +                       tcdm_base = ioremap_nocache(U8500_PRCMU_TCDM_BASE,
> > +                                               SZ_4K + SZ_8K) + SZ_8K;
> > +               else
> > +                       tcdm_base = __io_address(U8500_PRCMU_TCDM_BASE);
> >         } else {
> >                 pr_err("prcmu: Unsupported chip version\n");
> >                 BUG();
> 
> Would it be possible to get the base out of the device tree and always
> map it from there? Adding another dependency on a fixed constant is
> just going to make the conversion to multiplatform harder, since it
> was decided that device drivers should not have access to platform
> header files in the multiplatform case.

>From what I understand, this code has to be called before Device
Tree kicks in. Actually, this code is mearly a stand-in until Loic
has finished with the PRCMU re-vamp. Once that's complete, this
stuff will be passed from init_IRQ(), which is invoked directly in
start_kernel().

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/