static int __init visws_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
int irq, bus = dev->bus->number;
pin--;
/* Nothing useful at PIIX4 pin 1 */
if (bus == pci_bus0 && slot == 4 && pin == 0)
return -1;
/* PIIX4 USB is on Bus 0, Slot 4, Line 3 */
if (bus == pci_bus0 && slot == 4 && pin == 3) {
irq = CO_IRQ(CO_APIC_PIIX4_USB);
goto out;
}
/* First pin spread down 1 APIC entry per slot */
if (pin == 0) {
irq = CO_IRQ((bus == pci_bus0 ? CO_APIC_PCIB_BASE0 :
CO_APIC_PCIA_BASE0) + slot);
goto out;
}
/* lines 1,2,3 from any slot is shared in this twirly pattern */
if (bus == pci_bus1) {
/* lines 1-3 from devices 0 1 rotate over 2 apic entries */
irq = CO_IRQ(CO_APIC_PCIA_BASE123 + ((slot + (pin - 1)) % 2));
} else { /* bus == pci_bus0 */
/* lines 1-3 from devices 0-3 rotate over 3 apic entries */
if (slot == 0)
slot = 3; /* same pattern */
irq = CO_IRQ(CO_APIC_PCIA_BASE123 + ((3 - slot) + (pin - 1) % 3));
}
out:
printk(KERN_DEBUG "PCI: Bus %d Slot %d Line %d -> IRQ %d\n", bus, slot, pin, irq);
return irq;
}
static int __init visws_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
int irq, bus = dev->bus->number;
pin--;
if (bus == pci_bus0 && slot == 4 && pin == 0)
return -1;
if (bus == pci_bus0 && slot == 4 && pin == 3) {
irq = CO_IRQ(CO_APIC_PIIX4_USB);
goto out;
}
if (pin == 0) {
irq = CO_IRQ((bus == pci_bus0 ? CO_APIC_PCIB_BASE0 :
CO_APIC_PCIA_BASE0) + slot);
goto out;
}
if (bus == pci_bus1) {
irq = CO_IRQ(CO_APIC_PCIA_BASE123 + ((slot + (pin - 1)) % 2));
} else {
if (slot == 0)
slot = 3;
irq = CO_IRQ(CO_APIC_PCIA_BASE123 + ((3 - slot) + (pin - 1) % 3));
}
out:
printk(KERN_DEBUG "PCI: Bus %d Slot %d Line %d -> IRQ %d\n", bus, slot, pin, irq);
return irq;
}
