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fsg-pci.c

/*
 * arch/arch/mach-ixp4xx/fsg-pci.c
 *
 * FSG board-level PCI initialization
 *
 * Author: Rod Whitby <rod@whitby.id.au>
 * Maintainer: http://www.nslu2-linux.org/
 *
 * based on ixdp425-pci.c:
 *    Copyright (C) 2002 Intel Corporation.
 *    Copyright (C) 2003-2004 MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

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

#define MAX_DEV         3
#define IRQ_LINES 3

/* PCI controller GPIO to IRQ pin mappings */
#define INTA      6
#define INTB      7
#define INTC      5

void __init fsg_pci_preinit(void)
{
      set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
      set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
      set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
      ixp4xx_pci_preinit();
}

static int __init fsg_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
      static int pci_irq_table[IRQ_LINES] = {
            IXP4XX_GPIO_IRQ(INTC),
            IXP4XX_GPIO_IRQ(INTB),
            IXP4XX_GPIO_IRQ(INTA),
      };

      int irq = -1;
      slot -= 11;

      if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
            irq = pci_irq_table[slot - 1];
      printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
             __func__, slot, pin, irq);

      return irq;
}

struct hw_pci fsg_pci __initdata = {
      .nr_controllers = 1,
      .preinit =    fsg_pci_preinit,
      .swizzle =    pci_std_swizzle,
      .setup =      ixp4xx_setup,
      .scan =             ixp4xx_scan_bus,
      .map_irq =    fsg_map_irq,
};

int __init fsg_pci_init(void)
{
      if (machine_is_fsg())
            pci_common_init(&fsg_pci);
      return 0;
}

subsys_initcall(fsg_pci_init);

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