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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 428 | giacomo | 1 | /* |
| 2 | * drivers/pci/setup-irq.c |
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| 3 | * |
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| 4 | * Extruded from code written by |
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| 5 | * Dave Rusling (david.rusling@reo.mts.dec.com) |
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| 6 | * David Mosberger (davidm@cs.arizona.edu) |
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| 7 | * David Miller (davem@redhat.com) |
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| 8 | * |
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| 9 | * Support routines for initializing a PCI subsystem. |
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| 10 | */ |
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| 11 | |||
| 12 | |||
| 13 | #include <linux/init.h> |
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| 14 | #include <linux/kernel.h> |
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| 15 | #include <linux/pci.h> |
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| 16 | #include <linux/errno.h> |
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| 17 | #include <linux/ioport.h> |
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| 18 | #include <linux/cache.h> |
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| 19 | |||
| 20 | |||
| 21 | #define DEBUG_CONFIG 0 |
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| 22 | #if DEBUG_CONFIG |
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| 23 | # define DBGC(args) printk args |
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| 24 | #else |
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| 25 | # define DBGC(args) |
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| 26 | #endif |
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| 27 | |||
| 28 | |||
| 29 | static void __init |
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| 30 | pdev_fixup_irq(struct pci_dev *dev, |
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| 31 | u8 (*swizzle)(struct pci_dev *, u8 *), |
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| 32 | int (*map_irq)(struct pci_dev *, u8, u8)) |
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| 33 | { |
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| 34 | u8 pin, slot; |
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| 35 | int irq; |
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| 36 | |||
| 37 | /* If this device is not on the primary bus, we need to figure out |
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| 38 | which interrupt pin it will come in on. We know which slot it |
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| 39 | will come in on 'cos that slot is where the bridge is. Each |
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| 40 | time the interrupt line passes through a PCI-PCI bridge we must |
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| 41 | apply the swizzle function. */ |
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| 42 | |||
| 43 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); |
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| 44 | /* Cope with 0 and illegal. */ |
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| 45 | if (pin == 0 || pin > 4) |
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| 46 | pin = 1; |
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| 47 | |||
| 48 | /* Follow the chain of bridges, swizzling as we go. */ |
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| 49 | slot = (*swizzle)(dev, &pin); |
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| 50 | |||
| 51 | irq = (*map_irq)(dev, slot, pin); |
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| 52 | if (irq == -1) |
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| 53 | irq = 0; |
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| 54 | dev->irq = irq; |
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| 55 | |||
| 56 | DBGC((KERN_ERR "PCI fixup irq: (%s) got %d\n", dev->dev.name, dev->irq)); |
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| 57 | |||
| 58 | /* Always tell the device, so the driver knows what is |
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| 59 | the real IRQ to use; the device does not use it. */ |
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| 60 | pcibios_update_irq(dev, irq); |
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| 61 | } |
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| 62 | |||
| 63 | void __init |
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| 64 | pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *), |
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| 65 | int (*map_irq)(struct pci_dev *, u8, u8)) |
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| 66 | { |
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| 67 | struct pci_dev *dev = NULL; |
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| 68 | while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { |
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| 69 | pdev_fixup_irq(dev, swizzle, map_irq); |
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| 70 | } |
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| 71 | } |