LXR linux/arch/arm/mach-ixp4xx/nslu2-pci.c

   1/*
   2 * arch/arm/mach-ixp4xx/nslu2-pci.c
   3 *
   4 * NSLU2 board-level PCI initialization
   5 *
   6 * based on ixdp425-pci.c:
   7 *      Copyright (C) 2002 Intel Corporation.
   8 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
   9 *
  10 * Maintainer: http://www.nslu2-linux.org/
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of the GNU General Public License version 2 as
  14 * published by the Free Software Foundation.
  15 *
  16 */
  17
  18#include <linux/pci.h>
  19#include <linux/init.h>
  20#include <linux/irq.h>
  21#include <asm/mach/pci.h>
  22#include <asm/mach-types.h>
  23
  24#define MAX_DEV         3
  25#define IRQ_LINES       3
  26
  27/* PCI controller GPIO to IRQ pin mappings */
  28#define INTA            11
  29#define INTB            10
  30#define INTC            9
  31#define INTD            8
  32
  33void __init nslu2_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 nslu2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  42{
  43        static int pci_irq_table[IRQ_LINES] = {
  44                IXP4XX_GPIO_IRQ(INTA),
  45                IXP4XX_GPIO_IRQ(INTB),
  46                IXP4XX_GPIO_IRQ(INTC),
  47        };
  48
  49        if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  50                return pci_irq_table[(slot + pin - 2) % IRQ_LINES];
  51
  52        return -1;
  53}
  54
  55struct hw_pci __initdata nslu2_pci = {
  56        .nr_controllers = 1,
  57        .ops            = &ixp4xx_ops,
  58        .preinit        = nslu2_pci_preinit,
  59        .setup          = ixp4xx_setup,
  60        .map_irq        = nslu2_map_irq,
  61};
  62
  63int __init nslu2_pci_init(void) /* monkey see, monkey do */
  64{
  65        if (machine_is_nslu2())
  66                pci_common_init(&nslu2_pci);
  67
  68        return 0;
  69}
  70
  71subsys_initcall(nslu2_pci_init);
  72