linux-kernel - Re: [PATCH RFC v1] ARM: olpc: Add support for calling into the XO-1.75's OpenFirmware (OFW)

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Date:	Fri, 5 Aug 2011 00:32:06 +0100
From:	Eric Miao <eric.y.miao@...il.com>
To:	Andres Salomon <dilinger@...ued.net>,
	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	Russell King <linux@....linux.org.uk>,
	Mitch Bradley <wmb@...top.org>,
	"H. Peter Anvin" <hpa@...or.com>, dsd@...top.org
Subject: Re: [PATCH RFC v1] ARM: olpc: Add support for calling into the
 XO-1.75's OpenFirmware (OFW)

On Fri, Aug 5, 2011 at 12:25 AM, Andres Salomon <dilinger@...ued.net> wrote:
> Add support for saving OFW's cif, and later calling into it to run OFW
> commands from the kernel.  OFW remains resident in memory after boot,
> and the physical/virtual addresses are passed in a boot tag.  We parse
> that, and map the addresses.
>
> This is currently only used by the OLPC XO-1.75, so it's named olpc_ofw().
>
> Signed-off-by: Andres Salomon <dilinger@...ued.net>
> ---
>  Documentation/arm/Setup                  |    2 +
>  arch/arm/Kconfig                         |    8 ++
>  arch/arm/include/asm/olpc_ofw.h          |   23 ++++++
>  arch/arm/include/asm/setup.h             |   24 ++++++
>  arch/arm/mach-mmp/Makefile               |    1 +
>  arch/arm/mach-mmp/include/mach/vmalloc.h |    2 +-
>  arch/arm/mach-mmp/olpc-xo-1-75.c         |    7 ++
>  arch/arm/mach-mmp/olpc_ofw.c             |  118 ++++++++++++++++++++++++++++++
>  8 files changed, 184 insertions(+), 1 deletions(-)
>  create mode 100644 arch/arm/include/asm/olpc_ofw.h
>  create mode 100644 arch/arm/mach-mmp/olpc_ofw.c
>
>
> I'm looking for input on our mechanism for calling into OLPC's openfirmware
> on arm.  Some of the x86 folks are cc'd
> as they had lots of comment when we did this for x86 OLPC machines.
>
> There's a device tree patch on top of this that can be seen here:
> http://dev.laptop.org/git/olpc-3.0/patch/?id=12377851f9a64a9e2098adf09f858bed7d3eae7c
>
> Unlike the XO-1, I'd like to get this OFW communication mechanism ACKed prior to
> OLPC's mass production of these units.

Not really sure if it's the standard way of calling back into GFW, Grant?
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