[PATCH 6/6] [ARM] Introduce common definition for __io()

Wed Jun 23 15:54:56 EDT 2010

On Wed, Jun 23, 2010 at 07:52:18PM +0800, Eric Miao wrote:
> Signed-off-by: Eric Miao <eric.miao at canonical.com>
> ---
>  arch/arm/include/asm/io.h                 |    4 ++++
>  arch/arm/mach-aaec2000/include/mach/io.h  |    1 -
>  arch/arm/mach-at91/include/mach/io.h      |    1 -
>  arch/arm/mach-bcmring/include/mach/io.h   |    1 -
>  arch/arm/mach-clps711x/include/mach/io.h  |    1 -
>  arch/arm/mach-cns3xxx/include/mach/io.h   |    1 -
>  arch/arm/mach-davinci/include/mach/io.h   |    1 -
>  arch/arm/mach-ep93xx/include/mach/io.h    |    1 -

Again, ebsa110 is missing.

That's because __io() is a two-state definition.  It means something
if a platform does _not_ define it.  It also means something _if_ a
platform defines it.

You can't move it to asm/io.h because that precludes the first state
from ever occuring.  It's not a simple case that those platforms can
provide some subsitute definition for __io() - they have to supply
their own inb() et.al. accessors because they need to do something
uniquely special there.