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[SPARC64]: Fix PCI interrupts on E450 et al.

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When the PCI controller OBP node lacks an interrupt-map
and interrupt-map-mask property, we need to form the
INO by hand.  The PCI swizzle logic was not doing that
properly.

This was a regression added by the of_device code.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-02-26 14:55:06 -08:00
parent d3dcc2cb2c
commit bb4c18cbba
1 changed files with 38 additions and 2 deletions
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40
arch/sparc64/kernel/of_device.c
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@ -708,7 +708,7 @@ static unsigned int __init pci_irq_swizzle(struct device_node *dp,
unsigned int irq)
{
struct linux_prom_pci_registers *regs;
unsigned int devfn, slot, ret;
unsigned int bus, devfn, slot, ret;
if (irq < 1 || irq > 4)
return irq;
@ -717,10 +717,46 @@ static unsigned int __init pci_irq_swizzle(struct device_node *dp,
if (!regs)
return irq;
bus = (regs->phys_hi >> 16) & 0xff;
devfn = (regs->phys_hi >> 8) & 0xff;
slot = (devfn >> 3) & 0x1f;
ret = ((irq - 1 + (slot & 3)) & 3) + 1;
if (pp->irq_trans) {
/* Derived from Table 8-3, U2P User's Manual. This branch
* is handling a PCI controller that lacks a proper set of
* interrupt-map and interrupt-map-mask properties. The
* Ultra-E450 is one example.
*
* The bit layout is BSSLL, where:
* B: 0 on bus A, 1 on bus B
* D: 2-bit slot number, derived from PCI device number as
* (dev - 1) for bus A, or (dev - 2) for bus B
* L: 2-bit line number
*
* Actually, more "portable" way to calculate the funky
* slot number is to subtract pbm->pci_first_slot from the
* device number, and that's exactly what the pre-OF
* sparc64 code did, but we're building this stuff generically
* using the OBP tree, not in the PCI controller layer.
*/
if (bus & 0x80) {
/* PBM-A */
bus = 0x00;
slot = (slot - 1) << 2;
} else {
/* PBM-B */
bus = 0x10;
slot = (slot - 2) << 2;
}
irq -= 1;
ret = (bus | slot | irq);
} else {
/* Going through a PCI-PCI bridge that lacks a set of
* interrupt-map and interrupt-map-mask properties.
*/
ret = ((irq - 1 + (slot & 3)) & 3) + 1;
}
return ret;
}