PCI: alpha: use generic INTx swizzle from PCI core

Use the generic pci_common_swizzle() instead of arch-specific code.

Note that pci_common_swizzle() loops based on dev->bus->self, not
dev->bus->parent as the alpha common_swizzle() did. I think they
are equivalent for this purpose.

Signed-off-by: Bjorn Helgaas <[e-mail]>
Signed-off-by: Jesse Barnes <[e-mail]>

arch/alpha/kernel/pci.c

···
 	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
 }
 
-/* Most Alphas have straight-forward swizzling needs.  */
-
-u8 __init
-common_swizzle(struct pci_dev *dev, u8 *pinp)
-{
-	u8 pin = *pinp;
-
-	while (dev->bus->parent) {
-		pin = pci_swizzle_interrupt_pin(dev, pin);
-		/* Move up the chain of bridges. */
-		dev = dev->bus->self;
-        }
-	*pinp = pin;
-
-	/* The slot is the slot of the last bridge. */
-	return PCI_SLOT(dev->devfn);
-}
-
 void
 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			 struct resource *res)

arch/alpha/kernel/pci_impl.h

···
  *   Thus, each swizzle is ((pin-1) + (device#-4)) % 4
  *
  *   pci_swizzle_interrupt_pin() swizzles for exactly one bridge.  The routine
- *   common_swizzle below handles multiple bridges.  But there are a
+ *   pci_common_swizzle() handles multiple bridges.  But there are a
  *   couple boards that do strange things.
  */
 
···
 extern unsigned long alpha_agpgart_size;
 
 extern void common_init_pci(void);
-extern u8 common_swizzle(struct pci_dev *, u8 *);
+#define common_swizzle pci_common_swizzle
 extern struct pci_controller *alloc_pci_controller(void);
 extern struct resource *alloc_resource(void);