From: Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: "Tom Lendacky" <thomas.lendacky-5C7GfCeVMHo@public.gmane.org>,
"Brijesh Singh" <brijesh.singh-5C7GfCeVMHo@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Albert Herranz" <albert_herranz-mRCrAkd8dF0@public.gmane.org>,
"Jonathan Neuschäfer"
<j.neuschaefer-hi6Y0CQ0nG0@public.gmane.org>,
linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Thomas Gleixner" <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
"Borislav Petkov" <bp-l3A5Bk7waGM@public.gmane.org>,
linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
Subject: Re: [PATCH v2 1/6] resource: Extend the PPC32 reserved memory hack
Date: Tue, 23 Jan 2018 23:58:06 +1100 [thread overview]
Message-ID: <871sigwx41.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <20180122050411.32460-2-j.neuschaefer-hi6Y0CQ0nG0@public.gmane.org>
Jonathan Neuschäfer <j.neuschaefer-hi6Y0CQ0nG0@public.gmane.org> writes:
> On the Nintendo Wii, there are two ranges of physical memory, and MMIO
> in between, but Linux on ppc32 doesn't support discontiguous memory.
> Therefore a hack was introduced in commit c5df7f775148 ("powerpc: allow
> ioremap within reserved memory regions") and commit de32400dd26e ("wii:
> use both mem1 and mem2 as ram"):
>
> - Treat the area from the start of the first memory area (MEM1) to the
> end of the second (MEM2) as one big memory area, but mark the part
> that doesn't belong to MEM1 or MEM2 as reserved.
> - Only on the Wii, allow ioremap to be used on reserved memory.
>
> This hack, however, doesn't account for the "resource"-based API in
> kernel/resource.c, because __request_region performs its own checks.
>
> Extend the hack to kernel/resource.c, to allow more drivers to allocate
> their MMIO regions on the Wii.
Hi Jonathan,
Sorry but I can't merge a hack like this in generic code.
Has anyone looked at adding proper discontig mem support to PPC32?
Or can we punch a hole in the resource in the right place? Maybe from
add_system_ram_resources() ?
cheers
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next prev parent reply other threads:[~2018-01-23 12:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-22 5:04 [PATCH v2 0/6] Nintendo Wii GPIO driver Jonathan Neuschäfer
2018-01-22 5:04 ` [PATCH v2 1/6] resource: Extend the PPC32 reserved memory hack Jonathan Neuschäfer
[not found] ` <20180122050411.32460-2-j.neuschaefer-hi6Y0CQ0nG0@public.gmane.org>
2018-01-23 12:58 ` Michael Ellerman [this message]
2018-01-23 16:37 ` Jonathan Neuschäfer
2018-01-24 1:23 ` Michael Ellerman
2018-01-27 8:00 ` Jonathan Neuschäfer
2018-01-22 5:04 ` [PATCH v2 2/6] powerpc: wii: Explicitly configure GPIO owner for poweroff pin Jonathan Neuschäfer
2018-01-22 5:04 ` [PATCH v2 3/6] gpio: Add GPIO driver for Nintendo Wii Jonathan Neuschäfer
2018-01-28 17:31 ` Andy Shevchenko
2018-01-31 8:37 ` Jonathan Neuschäfer
2018-02-07 12:29 ` Linus Walleij
2018-02-07 12:54 ` Jonathan Neuschäfer
2018-01-22 5:04 ` [PATCH v2 4/6] dt-bindings: gpio: Add binding for Wii GPIO controller Jonathan Neuschäfer
2018-02-07 12:26 ` Linus Walleij
2018-01-22 5:04 ` [PATCH v2 5/6] powerpc: wii.dts: Add ngpios property Jonathan Neuschäfer
[not found] ` <20180122050411.32460-1-j.neuschaefer-hi6Y0CQ0nG0@public.gmane.org>
2018-01-22 5:04 ` [PATCH v2 6/6] powerpc: wii.dts: Add GPIO line names Jonathan Neuschäfer
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