pci-irq.c

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/* pci-irq.c: PCI IRQ routing on the FRV motherboard
 *
 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 * derived from: arch/i386/kernel/pci-irq.c: (c) 1999--2000 Martin Mares <[email protected]>
 */

#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 __initconst 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);
}