Re: [PATCH] alpha build fixes

[Ivan Kokshaysky <ink@jurassic.park.msu.ru>]

On Mon, Mar 21, 2005 at 11:27:39PM +1100, Benjamin Herrenschmidt wrote:
> IRQs on IDE in legacy mode is sort of an out-of-spec piece of junk that
> was invented to make PCI based peecees "look like" good old rotten
> hardware, unfortunately, some modern and non-x86 HW vendors still don't
> haev a clue and configure (wire in some case) their on board IDE in
> legacy mode, but with IRQs that, on those archs, aren't 14 and 15. That
> hook fixes the problem on some ppc64 machines but should be extended to
> cover various other cases where similar shit happens.

Indeed, such setup is quite typical for southbridge chips with
integrated IDE controller - they still simulate sort of ISA IRQ
routing...

> It's in PCI because I figured it was as bad there than anywhere else. In
> this case, it's the IDE layer asking the PCI layer "hey, that guy
> doesn't respect the normal PCI IRQ mapping, can you tell me how it's
> routed ?" :) Back then, I didn't know of a header shared between ide and
> libata so I put it there.

Ok, but asm-generic/pci.h is not a good place for default IRQ 14/15 case -
this header cannot be included on non-x86 without additional #ifdef's.
Perhaps we can move it to linux/pci.h or linux/ata.h (as Bart noted)?

Ivan.