[PATCH] Fix Maple PATA IRQ assignment.

[Jeff Garzik]

David Woodhouse wrote:
> On the Maple board, the AMD8111 IDE is in legacy mode... except that it
> appears on IRQ 20 instead of IRQ 15. For drivers/ide this was handled by
> the architecture's "pci_get_legacy_ide_irq()" function, but in libata we
> just hard-code the numbers 14 and 15.
> 
> This patch provides asm-powerpc/libata-portmap.h which maps the IRQ as
> appropriate, having added a pci_dev argument to the
> ATA_{PRIM,SECOND}ARY_IRQ macros.
> 
> There's probably a better way to do this -- especially if we observe
> that the _only_ case in which this seemingly-generic
> "pci_get_legacy_ide_irq()" function returns anything other than 14 and
> 15 for primary and secondary respectively is the case of the AMD8111 on
> the Maple board -- couldn't we handle that with a special case in the
> pata_amd driver, or perhaps with a PCI quirk for Maple to switch it into
> native mode during early boot and assign resources properly?
> 
> Signed-off-by: David Woodhouse <dwmw2 at infradead.org>

applied