LXR linux/arch/arm/mach-ixp4xx/ixdp425-pci.c

   1/*
   2 * arch/arm/mach-ixp4xx/ixdp425-pci.c
   3 *
   4 * IXDP425 board-level PCI initialization
   5 *
   6 * Copyright (C) 2002 Intel Corporation.
   7 * Copyright (C) 2003-2004 MontaVista Software, Inc.
   8 *
   9 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License version 2 as
  13 * published by the Free Software Foundation.
  14 *
  15 */
  16
  17#include <linux/kernel.h>
  18#include <linux/pci.h>
  19#include <linux/init.h>
  20#include <linux/irq.h>
  21#include <linux/delay.h>
  22#include <asm/mach/pci.h>
  23#include <asm/irq.h>
  24#include <mach/hardware.h>
  25#include <asm/mach-types.h>
  26
  27#define MAX_DEV         4
  28#define IRQ_LINES       4
  29
  30/* PCI controller GPIO to IRQ pin mappings */
  31#define INTA            11
  32#define INTB            10
  33#define INTC            9
  34#define INTD            8
  35
  36
  37void __init ixdp425_pci_preinit(void)
  38{
  39        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  40        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  41        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  42        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  43        ixp4xx_pci_preinit();
  44}
  45
  46static int __init ixdp425_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  47{
  48        static int pci_irq_table[IRQ_LINES] = {
  49                IXP4XX_GPIO_IRQ(INTA),
  50                IXP4XX_GPIO_IRQ(INTB),
  51                IXP4XX_GPIO_IRQ(INTC),
  52                IXP4XX_GPIO_IRQ(INTD)
  53        };
  54
  55        if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  56                return pci_irq_table[(slot + pin - 2) % 4];
  57
  58        return -1;
  59}
  60
  61struct hw_pci ixdp425_pci __initdata = {
  62        .nr_controllers = 1,
  63        .ops            = &ixp4xx_ops,
  64        .preinit        = ixdp425_pci_preinit,
  65        .setup          = ixp4xx_setup,
  66        .map_irq        = ixdp425_map_irq,
  67};
  68
  69int __init ixdp425_pci_init(void)
  70{
  71        if (machine_is_ixdp425() || machine_is_ixcdp1100() ||
  72                        machine_is_ixdp465() || machine_is_kixrp435())
  73                pci_common_init(&ixdp425_pci);
  74        return 0;
  75}
  76
  77subsys_initcall(ixdp425_pci_init);
  78