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[POWERPC] Workaround oldworld OF bug with IRQs & P2P bridges

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On some oldworld PowerMacs, OF doesn't assign interrupts properly
beyond P2P bridges. Fortunately, the fix is easy as all those machines
just wire all IRQ lines together to one IRQ which is assigned to the
bridge itself. We already have a special function for parsing Apple
OldWorld interrupts which are special, so let's add to it the ability
to walk up the PCI tree to find interrupts.

This fixes irqs on the lower slots of s900 clones among others.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt 2006-12-15 07:13:26 +11:00 committed by Paul Mackerras
parent 3cd7613e25
commit 6f67f9d26f
1 changed files with 13 additions and 2 deletions
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15
arch/powerpc/kernel/prom_parse.c
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@ -920,9 +920,20 @@ static int of_irq_map_oldworld(struct device_node *device, int index,
/*
* Old machines just have a list of interrupt numbers
* and no interrupt-controller nodes.
* and no interrupt-controller nodes. We also have dodgy
* cases where the APPL,interrupts property is completely
* missing behind pci-pci bridges and we have to get it
* from the parent (the bridge itself, as apple just wired
* everything together on these)
*/
ints = get_property(device, "AAPL,interrupts", &intlen);
while (device) {
ints = get_property(device, "AAPL,interrupts", &intlen);
if (ints != NULL)
break;
device = device->parent;
if (device && strcmp(device->type, "pci") != 0)
break;
}
if (ints == NULL)
return -EINVAL;
intlen /= sizeof(u32);