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/*

 *      drivers/pci/setup-irq.c

 *

 * Extruded from code written by

 *      Dave Rusling (david.rusling@reo.mts.dec.com)

 *      David Mosberger (davidm@cs.arizona.edu)

 *      David Miller (davem@redhat.com)

 *

 * Support routines for initializing a PCI subsystem.

 */

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/pci.h>

#include <linux/errno.h>

#include <linux/ioport.h>

#include <linux/cache.h>

static void __init

pdev_fixup_irq(struct pci_dev *dev,

               u8 (*swizzle)(struct pci_dev *, u8 *),

               int (*map_irq)(struct pci_dev *, u8, u8))

{

        u8 pin, slot;

        int irq = 0;

        /* If this device is not on the primary bus, we need to figure out

           which interrupt pin it will come in on.   We know which slot it

           will come in on 'cos that slot is where the bridge is.   Each

           time the interrupt line passes through a PCI-PCI bridge we must

           apply the swizzle function.  */

        pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);

        /* Cope with illegal. */

        if (pin > 4)

                pin = 1;

        if (pin != 0) {

                /* Follow the chain of bridges, swizzling as we go.  */

                slot = (*swizzle)(dev, &pin);

                irq = (*map_irq)(dev, slot, pin);

                if (irq == -1)

                        irq = 0;

        }

        dev->irq = irq;

        pr_debug("PCI: fixup irq: (%s) got %d\n",

                kobject_name(&dev->dev.kobj), dev->irq);

        /* Always tell the device, so the driver knows what is

           the real IRQ to use; the device does not use it. */

        pcibios_update_irq(dev, irq);

}

void __init

pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *),

               int (*map_irq)(struct pci_dev *, u8, u8))

{

        struct pci_dev *dev = NULL;

        while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {

                pdev_fixup_irq(dev, swizzle, map_irq);

        }

}