arch/frv/mb93090-mb00/pci-irq.c

   1 /* pci-irq.c: PCI IRQ routing on the FRV motherboard
   2  *
   3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  * derived from: arch/i386/kernel/pci-irq.c: (c) 1999--2000 Martin Mares <mj@suse.cz>
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/pci.h>
  11 #include <linux/init.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/irq.h>
  14
  15 #include <asm/io.h>
  16 #include <asm/smp.h>
  17
  18 #include "pci-frv.h"
  19
  20 /*
  21  *      DEVICE  DEVNO   INT#A   INT#B   INT#C   INT#D
  22  *      ======= ======= ======= ======= ======= =======
  23  *      MB86943 0       fpga.10 -       -       -
  24  *      RTL8029 16      fpga.12 -       -       -
  25  *      SLOT 1  19      fpga.6  fpga.5  fpga.4  fpga.3
  26  *      SLOT 2  18      fpga.5  fpga.4  fpga.3  fpga.6
  27  *      SLOT 3  17      fpga.4  fpga.3  fpga.6  fpga.5
  28  *
  29  */
  30
  31 static const uint8_t __initconst pci_bus0_irq_routing[32][4] = {
  32         [0 ] = { IRQ_FPGA_MB86943_PCI_INTA },
  33         [16] = { IRQ_FPGA_RTL8029_INTA },
  34         [17] = { IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB },
  35         [18] = { IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA },
  36         [19] = { IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD },
  37 };
  38
  39 void __init pcibios_irq_init(void)
  40 {
  41 }
  42
  43 void __init pcibios_fixup_irqs(void)
  44 {
  45         struct pci_dev *dev = NULL;
  46         uint8_t line, pin;
  47
  48         for_each_pci_dev(dev) {
  49                 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
  50                 if (pin) {
  51                         dev->irq = pci_bus0_irq_routing[PCI_SLOT(dev->devfn)][pin - 1];
  52                         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
  53                 }
  54                 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
  55         }
  56 }
  57
  58 void pcibios_enable_irq(struct pci_dev *dev)
  59 {
  60         pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
  61 }