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

   1/*
   2 * arch/arm/mach-ixp4xx/miccpt-pci.c
   3 *
   4 * MICCPT board-level PCI initialization
   5 *
   6 * Copyright (C) 2002 Intel Corporation.
   7 * Copyright (C) 2003-2004 MontaVista Software, Inc.
   8 * Copyright (C) 2006 OMICRON electronics GmbH
   9 *
  10 * Author: Michael Jochum <michael.jochum@omicron.at>
  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/kernel.h>
  19#include <linux/pci.h>
  20#include <linux/init.h>
  21#include <linux/delay.h>
  22#include <linux/irq.h>
  23#include <asm/mach/pci.h>
  24#include <asm/irq.h>
  25#include <mach/hardware.h>
  26#include <asm/mach-types.h>
  27
  28#define MAX_DEV         4
  29#define IRQ_LINES       4
  30
  31/* PCI controller GPIO to IRQ pin mappings */
  32#define INTA            1
  33#define INTB            2
  34#define INTC            3
  35#define INTD            4
  36
  37
  38void __init miccpt_pci_preinit(void)
  39{
  40        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  41        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  42        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  43        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  44        ixp4xx_pci_preinit();
  45}
  46
  47static int __init miccpt_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  48{
  49        static int pci_irq_table[IRQ_LINES] = {
  50                IXP4XX_GPIO_IRQ(INTA),
  51                IXP4XX_GPIO_IRQ(INTB),
  52                IXP4XX_GPIO_IRQ(INTC),
  53                IXP4XX_GPIO_IRQ(INTD)
  54        };
  55
  56        if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  57                return pci_irq_table[(slot + pin - 2) % 4];
  58
  59        return -1;
  60}
  61
  62struct hw_pci miccpt_pci __initdata = {
  63        .nr_controllers = 1,
  64        .ops            = &ixp4xx_ops,
  65        .preinit        = miccpt_pci_preinit,
  66        .setup          = ixp4xx_setup,
  67        .map_irq        = miccpt_map_irq,
  68};
  69
  70int __init miccpt_pci_init(void)
  71{
  72        if (machine_is_miccpt())
  73                pci_common_init(&miccpt_pci);
  74        return 0;
  75}
  76
  77subsys_initcall(miccpt_pci_init);
  78