arch/mn10300/unit-asb2305/pci-irq.c

   1 /* PCI IRQ routing on the MN103E010 based ASB2305
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  *
  11  * This is simple: All PCI interrupts route through the CPU's XIRQ1 pin [IRQ 35]
  12  */
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/pci.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/irq.h>
  19 #include <asm/io.h>
  20 #include <asm/smp.h>
  21 #include "pci-asb2305.h"
  22
  23 void __init pcibios_irq_init(void)
  24 {
  25 }
  26
  27 void __init pcibios_fixup_irqs(void)
  28 {
  29         struct pci_dev *dev = NULL;
  30         u8 line, pin;
  31
  32         for_each_pci_dev(dev) {
  33                 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
  34                 if (pin) {
  35                         dev->irq = XIRQ1;
  36                         pci_write_config_byte(dev, PCI_INTERRUPT_LINE,
  37                                               dev->irq);
  38                 }
  39                 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
  40         }
  41 }
  42
  43 void pcibios_enable_irq(struct pci_dev *dev)
  44 {
  45         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
  46 }