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Tip revision: 09b56adc98e0f8a21644fcb4d20ad367c3fceb55 authored by Linus Torvalds on 04 December 2007, 04:26:10 UTC
Linux 2.6.24-rc4
Linux 2.6.24-rc4
Tip revision: 09b56ad
setup-irq.c
/*
* 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);
}
}