cats-pci.c

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/*
 * linux/arch/arm/mach-footbridge/cats-pci.c
 *
 * PCI bios-type initialisation for PCI machines
 *
 * Bits taken from various places.
 */
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>

#include <asm/irq.h>
#include <asm/mach/pci.h>
#include <asm/mach-types.h>

/* cats host-specific stuff */
static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };

static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin)
{
    return 0;
}

static int __init cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
    if (dev->irq >= 255)
        return -1;  /* not a valid interrupt. */

    if (dev->irq >= 128)
        return dev->irq & 0x1f;

    if (dev->irq >= 1 && dev->irq <= 4)
        return irqmap_cats[dev->irq - 1];

    if (dev->irq != 0)
        printk("PCI: device %02x:%02x has unknown irq line %x\n",
               dev->bus->number, dev->devfn, dev->irq);

    return -1;
}

/*
 * why not the standard PCI swizzle?  does this prevent 4-port tulip
 * cards being used (ie, pci-pci bridge based cards)?
 */
static struct hw_pci cats_pci __initdata = {
    .swizzle        = cats_no_swizzle,
    .map_irq        = cats_map_irq,
    .nr_controllers     = 1,
    .ops            = &dc21285_ops,
    .setup          = dc21285_setup,
    .preinit        = dc21285_preinit,
    .postinit       = dc21285_postinit,
};

static int __init cats_pci_init(void)
{
    if (machine_is_cats())
        pci_common_init(&cats_pci);
    return 0;
}

subsys_initcall(cats_pci_init);