[PATCH] ARM: Orion5x - Restore parts of io.h

[arnd@arndb.de (Arnd Bergmann)]

On Wednesday 20 June 2012, Andrew Lunn wrote:
> Commit 4d5fc58dbe34b78157c05b319669bb3e064ba8bd remove the orion5x
> io.h. Unfortunetely, this is still needed for the definition of
> IO_SPACE_LIMIT which overrides the default 64K. All Orion based
> systems have 1Mbyte of IO space per PCI[e] bus, and try to
> request_resource() this size.

> diff --git a/arch/arm/mach-orion5x/include/mach/io.h b/arch/arm/mach-orion5x/include/mach/io.h
> new file mode 100644
> index 0000000..f017fe2
> --- /dev/null
> +++ b/arch/arm/mach-orion5x/include/mach/io.h
> @@ -0,0 +1,14 @@
> +/*
> + * arch/arm/mach-orion5x/include/mach/io.h
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2.  This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#ifndef __ASM_ARCH_IO_H
> +#define __ASM_ARCH_IO_H
> +
> +#define IO_SPACE_LIMIT		0xffffffff
> +#define __io(a)			__typesafe_io(a)
> +#endif

So if you need 1 MB per bus, why do you make the limit 4GB? Also,
the __io function does not actually point to the IO window at all,
which also appears to be horribly wrong.

My guess is that you actually want this to be

#define IO_SPACE_LIMIT SZ_2MB
#define __io(a)	((void __iomem *)ORION5X_PCI_IO_VIRT_BASE + a)

Your patch otherwise would make the kernel build again, but has
no chance of doing the right thing.

	Arnd