1/*
 2 *	drivers/pci/setup-irq.c
 3 *
 4 * Extruded from code written by
 5 *      Dave Rusling (david.rusling@reo.mts.dec.com)
 6 *      David Mosberger (davidm@cs.arizona.edu)
 7 *	David Miller (davem@redhat.com)
 8 *
 9 * Support routines for initializing a PCI subsystem.
10 */
11
12
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/pci.h>
16#include <linux/errno.h>
17#include <linux/ioport.h>
18#include <linux/cache.h>
19
 
 
 
 
 
20
21static void __init
22pdev_fixup_irq(struct pci_dev *dev,
23	       u8 (*swizzle)(struct pci_dev *, u8 *),
24	       int (*map_irq)(const struct pci_dev *, u8, u8))
25{
26	u8 pin, slot;
27	int irq = 0;
28
29	/* If this device is not on the primary bus, we need to figure out
30	   which interrupt pin it will come in on.   We know which slot it
31	   will come in on 'cos that slot is where the bridge is.   Each
32	   time the interrupt line passes through a PCI-PCI bridge we must
33	   apply the swizzle function.  */
34
35	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
36	/* Cope with illegal. */
37	if (pin > 4)
38		pin = 1;
39
40	if (pin != 0) {
41		/* Follow the chain of bridges, swizzling as we go.  */
42		slot = (*swizzle)(dev, &pin);
43
44		irq = (*map_irq)(dev, slot, pin);
45		if (irq == -1)
46			irq = 0;
47	}
48	dev->irq = irq;
49
50	dev_dbg(&dev->dev, "fixup irq: got %d\n", dev->irq);
51
52	/* Always tell the device, so the driver knows what is
53	   the real IRQ to use; the device does not use it. */
54	pcibios_update_irq(dev, irq);
55}
56
57void __init
58pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *),
59	       int (*map_irq)(const struct pci_dev *, u8, u8))
60{
61	struct pci_dev *dev = NULL;
62	for_each_pci_dev(dev)
63		pdev_fixup_irq(dev, swizzle, map_irq);
64}

 1/*
 2 *	drivers/pci/setup-irq.c
 3 *
 4 * Extruded from code written by
 5 *      Dave Rusling (david.rusling@reo.mts.dec.com)
 6 *      David Mosberger (davidm@cs.arizona.edu)
 7 *	David Miller (davem@redhat.com)
 8 *
 9 * Support routines for initializing a PCI subsystem.
10 */
11
12
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/pci.h>
16#include <linux/errno.h>
17#include <linux/ioport.h>
18#include <linux/cache.h>
19
20void __weak pcibios_update_irq(struct pci_dev *dev, int irq)
21{
22	dev_dbg(&dev->dev, "assigning IRQ %02d\n", irq);
23	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
24}
25
26static void
27pdev_fixup_irq(struct pci_dev *dev,
28	       u8 (*swizzle)(struct pci_dev *, u8 *),
29	       int (*map_irq)(const struct pci_dev *, u8, u8))
30{
31	u8 pin, slot;
32	int irq = 0;
33
34	/* If this device is not on the primary bus, we need to figure out
35	   which interrupt pin it will come in on.   We know which slot it
36	   will come in on 'cos that slot is where the bridge is.   Each
37	   time the interrupt line passes through a PCI-PCI bridge we must
38	   apply the swizzle function.  */
39
40	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
41	/* Cope with illegal. */
42	if (pin > 4)
43		pin = 1;
44
45	if (pin != 0) {
46		/* Follow the chain of bridges, swizzling as we go.  */
47		slot = (*swizzle)(dev, &pin);
48
49		irq = (*map_irq)(dev, slot, pin);
50		if (irq == -1)
51			irq = 0;
52	}
53	dev->irq = irq;
54
55	dev_dbg(&dev->dev, "fixup irq: got %d\n", dev->irq);
56
57	/* Always tell the device, so the driver knows what is
58	   the real IRQ to use; the device does not use it. */
59	pcibios_update_irq(dev, irq);
60}
61
62void
63pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *),
64	       int (*map_irq)(const struct pci_dev *, u8, u8))
65{
66	struct pci_dev *dev = NULL;
67	for_each_pci_dev(dev)
68		pdev_fixup_irq(dev, swizzle, map_irq);
69}