Re: [parisc-linux] EISA support

[Matthew Wilcox <willy@debian.org>]

On Wed, Oct 10, 2001 at 03:28:07PM +0100, Matthew Wilcox wrote:
> I haven't written that code yet.  Basically, I need to allocate a new IRQ
> region for EISA interrupts, then on receipt of Asp irq 21 read the EISA
> interrupt number from 0xfc01f000.  It seems there may be some extra gunk
> needed to handle the TI chipset, but I'll have a go at getting interrupts
> to work later today.

Turns out it's unsufferably ugly to do this right now, due to Mongoose
being a _sibling_ of Asp, not a _child_.  So I've put a nasty patch at
ftp://puffin.external.hp.com/pub/parisc/src/eisa-irq.c which works enough
that it seems to claim the IRQs; but the hp100 driver just allocates
IRQ3 and doesn't allow any kind of fixup, so I haven't actually tested it.

I have a plan to allocate Mongoose's IRQ in a nicer way, but that will
have to wait until tomorrow.  What do you think the best way would be
to fix EISA card IRQs?  I have a couple of thoughts:

 * Introduce a new EISA_IRQ_BASE macro that most architectures
   define to 0.
 * Reserve IRQ region 0 for EISA

Any better ideas?

-- 
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