projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 21 | static void __init | |
| 22 | pdev_fixup_irq(struct pci_dev *dev, | |
| 23 | u8 (*swizzle)(struct pci_dev *, u8 *), | |
| 24 | int (*map_irq)(struct pci_dev *, u8, u8)) | |
| 25 | { | |
| 26 | u8 pin, slot; | |
| 27 | int irq; | |
| 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 0 and illegal. */ | |
| 37 | if (pin == 0 || pin > 4) | |
| 38 | pin = 1; | |
| 39 | ||
| 40 | /* Follow the chain of bridges, swizzling as we go. */ | |
| 41 | slot = (*swizzle)(dev, &pin); | |
| 42 | ||
| 43 | irq = (*map_irq)(dev, slot, pin); | |
| 44 | if (irq == -1) | |
| 45 | irq = 0; | |
| 46 | dev->irq = irq; | |
| 47 | ||
| 48 | pr_debug("PCI: fixup irq: (%s) got %d\n", | |
| 49 | dev->dev.kobj.name, dev->irq); | |
| 50 | ||
| 51 | /* Always tell the device, so the driver knows what is | |
| 52 | the real IRQ to use; the device does not use it. */ | |
| 53 | pcibios_update_irq(dev, irq); | |
| 54 | } | |
| 55 | ||
| 56 | void __init | |
| 57 | pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *), | |
| 58 | int (*map_irq)(struct pci_dev *, u8, u8)) | |
| 59 | { | |
| 60 | struct pci_dev *dev = NULL; | |
| 61 | while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { | |
| 62 | pdev_fixup_irq(dev, swizzle, map_irq); | |
| 63 | } | |
| 64 | } |