From mboxrd@z Thu Jan  1 00:00:00 1970
From: mb@bu3sch.de (Michael =?ISO-8859-1?Q?B=FCsch?=)
Date: Wed, 06 Apr 2011 22:57:08 +0200
Subject: [RFC][PATCH] bcmai: introduce AI driver
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To: linux-arm-kernel@lists.infradead.org
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On Wed, 2011-04-06 at 22:42 +0200, Rafa? Mi?ecki wrote: 
> 2011/4/6 Rafa? Mi?ecki <zajec5@gmail.com>:
> > If we want to have two drivers working on two (different) cores
> > simultaneously, we will have to add trivial mutex to group core
> > switching with core operation (read/write).
> 
> With a little of work we could avoid switching and mutexes on no-host
> boards. MMIO is not limited to one core at once in such a case.

I don't think that this is a problem at all.
All that magic does happen inside of the bus I/O handlers.
Just like SSB does it.