[MIPS] IP27: Switch to dynamic interrupt routing avoding panic on error.
pcibios_map_irq is no way of returning an error but on IP27 an interrupt
is possibly not routable when running out of resources. So do the
interrupt routing at pcibios_enable_device time.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/pci/pci-ip27.c b/arch/mips/pci/pci-ip27.c
index bd78368..f97ab14 100644
--- a/arch/mips/pci/pci-ip27.c
+++ b/arch/mips/pci/pci-ip27.c
@@ -143,25 +143,47 @@
*/
int __devinit pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
- struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
- int irq = bc->pci_int[slot];
+ return 0;
+}
- if (irq == -1) {
- irq = bc->pci_int[slot] = request_bridge_irq(bc);
- if (irq < 0)
- panic("Can't allocate interrupt for PCI device %s\n",
- pci_name(dev));
+/* Most MIPS systems have straight-forward swizzling needs. */
+static inline u8 bridge_swizzle(u8 pin, u8 slot)
+{
+ return (((pin - 1) + slot) % 4) + 1;
+}
+
+static inline struct pci_dev *bridge_root_dev(struct pci_dev *dev)
+{
+ while (dev->bus->parent) {
+ /* Move up the chain of bridges. */
+ dev = dev->bus->self;
}
- irq_to_bridge[irq] = bc;
- irq_to_slot[irq] = slot;
-
- return irq;
+ return dev;
}
/* Do platform specific device initialization at pci_enable_device() time */
int pcibios_plat_dev_init(struct pci_dev *dev)
{
+ struct bridge_controller *bc = BRIDGE_CONTROLLER(dev->bus);
+ struct pci_dev *rdev = bridge_root_dev(dev);
+ int slot = PCI_SLOT(rdev->devfn);
+ int irq;
+
+ irq = bc->pci_int[slot];
+ if (irq == -1) {
+ irq = request_bridge_irq(bc);
+ if (irq < 0)
+ return irq;
+
+ bc->pci_int[slot] = irq;
+ }
+
+ irq_to_bridge[irq] = bc;
+ irq_to_slot[irq] = slot;
+
+ dev->irq = irq;
+
return 0;
}