Various PMac PCI patches

Hi all,

Here are some PMac PCI patches and fixes:

1. On the PowerMac, OpenBugware explicitly ignores PCI_INTERRUPT_LINE.
However, a quick grep shows that numerous drivers rely on its value for
driver initialization. Therefore, I've added a config_write to the
existing IRQ fixup code, so that the IRQ gets written back into
the PCI config register. By the way, the fixup function (fix_intr) is
in a general file (pci.c), but only called from PMac-specific code. 

Can those of you with PCI add-on boards see if this breaks anything?

Patch is below (pci.c-patch).

Andre: not sure, but this might have helped for the Promise as well...

2. I've hacked pmac_pcibios_fixup with a few changes:

- It now checks for PCI buses other than the first one, on all bridges.
This should help on the 7x00/8x00 machines (bandit and chaos host
bridges) as well as on the 9x00 (two bandit bridges; second bus would
be invisible up to now). If anyone has a 9x00, can  you test if this
works? For me it only detects one of two devices on bus 1....

- The IRQ fixup code already checks for the presence of interrupts, so
I'v changed Martin's comment. Also, I'm not sure if PMac PCI boards can
ever use more than one interrupt, as all PCI interrupt lines are OR'ed
together on the bridge....

- I've added IO and memory space enable code from i386's fixup code,
minus some port address checks.This should be safe on all concerned
machines.

Patch for all this is below (pmac_pci.c-patch).

If no one objects to these patches, who volounteers to get them into
the mainstream? ;-)

Thanks

Michel

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