[PATCH] ARM: Add Versatile Express CA9x4 processor support

[Will Deacon]

Hello Russell,

> On Fri, Mar 05, 2010 at 12:08:02PM -0000, Will Deacon wrote:
> > The only problem with adding the PMU interrupts here is that
> > they are not visible to kernel/pmu.c, which includes <linux/interrupt.h>.
> > Adding a conditional #include <mach/ct-ca9x4.h> worked, but it's not
> > very nice. Would it be possible to include the tile IRQs in the
> > include/mach/irqs.h?
> 
> Given that this platform can have multiple different tiles fitted, I
> don't think it's correct to publicise the interrupt numbers globally.
> 
> Currently, we have the situation where 99.9% of the tile dependencies
> are entirely separated from the motherboard - the only exception being
> the base of the motherboard IRQ numbers, and the base addresses of
> the motherboard CS regions.
> 
> It would be better if there was some way to allow board support to
> register their individual details with the PMU code.  The fact that
> the PMU interrupts on CA9x4 are 92-95 does not mean that on another
> Versatile Express tile, they will be the same - and in that case if
> you select the interrupts through ifdefs, you're tied to only one
> platform inspite of the rest of the kernel image supporting multiple
> platforms.

You're right. Adding a PMU IRQ registration mechanism might also help
to solve the problem of registering other event sources that a board may
have. I'll try and put something together this week as an RFC.

Cheers,

Will