linux-kernel - Re: [PATCH V2 5/6] x86: add CONFIG_ARM

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Message-ID: <20120701105934.GD16319@n2100.arm.linux.org.uk>
Date:	Sun, 1 Jul 2012 11:59:35 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Alessandro Rubini <rubini@...dd.com>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org,
	giancarlo.asnaghi@...com, alan@...ux.intel.com, x86@...nel.org,
	gregkh@...uxfoundation.org, arnd@...db.de,
	linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH V2 5/6] x86: add CONFIG_ARM_AMBA, selected by STA2X11

On Sun, Jul 01, 2012 at 12:44:01PM +0200, Alessandro Rubini wrote:
> How should I address the problem? (original code, published on
> sourceforge was simply replicating a number of amba drivers into pci
> drivers, but I don't think massive code duplication is ever sensible,
> thus I preferred to reuse the existing drivers).

I think the answer is... those primecell drivers need fixing in some way.
Re-defining CS, DS and ES in drivers is rather silly given that they're
x86 segment register names - so if PL330 can be fixed to make its names
more specific, that sorts it out.

As for PL08x, which depends on asm/hardware/pl080.h, I think that's going
to have to be a config dependency - it would be nice to move that header
into drivers/dma and make it private to the amba-pl08x driver, but we have
definitions in there which platforms supply to the pl08x driver via
platform data.  I'd rather not stuff the register definitions into
include/linux/platform_data/...

Note also that hpa has only reported the first errors he encountered, so
there may be more, and that's somehting which needs checking.
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