LXR linux/arch/arm/mach-ixp4xx/fsg-pci.c

   1/*
   2 * arch/arch/mach-ixp4xx/fsg-pci.c
   3 *
   4 * FSG board-level PCI initialization
   5 *
   6 * Author: Rod Whitby <rod@whitby.id.au>
   7 * Maintainer: http://www.nslu2-linux.org/
   8 *
   9 * based on ixdp425-pci.c:
  10 *      Copyright (C) 2002 Intel Corporation.
  11 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License version 2 as
  15 * published by the Free Software Foundation.
  16 *
  17 */
  18
  19#include <linux/pci.h>
  20#include <linux/init.h>
  21#include <linux/irq.h>
  22#include <asm/mach/pci.h>
  23#include <asm/mach-types.h>
  24
  25#define MAX_DEV         3
  26#define IRQ_LINES       3
  27
  28/* PCI controller GPIO to IRQ pin mappings */
  29#define INTA    6
  30#define INTB    7
  31#define INTC    5
  32
  33void __init fsg_pci_preinit(void)
  34{
  35        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  36        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  37        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  38        ixp4xx_pci_preinit();
  39}
  40
  41static int __init fsg_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  42{
  43        static int pci_irq_table[IRQ_LINES] = {
  44                IXP4XX_GPIO_IRQ(INTC),
  45                IXP4XX_GPIO_IRQ(INTB),
  46                IXP4XX_GPIO_IRQ(INTA),
  47        };
  48
  49        int irq = -1;
  50        slot -= 11;
  51
  52        if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  53                irq = pci_irq_table[slot - 1];
  54        printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
  55               __func__, slot, pin, irq);
  56
  57        return irq;
  58}
  59
  60struct hw_pci fsg_pci __initdata = {
  61        .nr_controllers = 1,
  62        .ops            = &ixp4xx_ops,
  63        .preinit =        fsg_pci_preinit,
  64        .setup =          ixp4xx_setup,
  65        .map_irq =        fsg_map_irq,
  66};
  67
  68int __init fsg_pci_init(void)
  69{
  70        if (machine_is_fsg())
  71                pci_common_init(&fsg_pci);
  72        return 0;
  73}
  74
  75subsys_initcall(fsg_pci_init);
  76