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pci-irq.c

/* pci-irq.c: PCI IRQ routing on the FRV motherboard
 *
 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * derived from: arch/i386/kernel/pci-irq.c: (c) 1999--2000 Martin Mares <mj@suse.cz>
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/io.h>
#include <asm/smp.h>

#include "pci-frv.h"

/*
 *    DEVICE      DEVNO INT#A INT#B INT#C INT#D
 *    =======     =======     =======     =======     =======     =======
 *    MB86943     0     fpga.10     -     -     -
 *    RTL8029     16    fpga.12     -     -     -
 *    SLOT 1      19    fpga.6      fpga.5      fpga.4      fpga.3
 *    SLOT 2      18    fpga.5      fpga.4      fpga.3      fpga.6
 *    SLOT 3      17    fpga.4      fpga.3      fpga.6      fpga.5
 *
 */

static const uint8_t __initdata pci_bus0_irq_routing[32][4] = {
      [0 ] = { IRQ_FPGA_MB86943_PCI_INTA },
      [16] = { IRQ_FPGA_RTL8029_INTA },
      [17] = { IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB },
      [18] = { IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA },
      [19] = { IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD },
};

void __init pcibios_irq_init(void)
{
}

void __init pcibios_fixup_irqs(void)
{
      struct pci_dev *dev = NULL;
      uint8_t line, pin;

      for_each_pci_dev(dev) {
            pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
            if (pin) {
                  dev->irq = pci_bus0_irq_routing[PCI_SLOT(dev->devfn)][pin - 1];
                  pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
            }
            pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
      }
}

void __init pcibios_penalize_isa_irq(int irq)
{
}

void pcibios_enable_irq(struct pci_dev *dev)
{
      pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
}

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