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

   1/*
   2 * arch/arch/mach-ixp4xx/vulcan-pci.c
   3 *
   4 * Vulcan board-level PCI initialization
   5 *
   6 * Copyright (C) 2010 Marc Zyngier <maz@misterjones.org>
   7 *
   8 * based on ixdp425-pci.c:
   9 *      Copyright (C) 2002 Intel Corporation.
  10 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  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/* PCI controller GPIO to IRQ pin mappings */
  25#define INTA    2
  26#define INTB    3
  27
  28void __init vulcan_pci_preinit(void)
  29{
  30#ifndef CONFIG_IXP4XX_INDIRECT_PCI
  31        /*
  32         * Cardbus bridge wants way more than the SoC can actually offer,
  33         * and leaves the whole PCI bus in a mess. Artificially limit it
  34         * to 8MB per region. Of course indirect mode doesn't have this
  35         * limitation...
  36         */
  37        pci_cardbus_mem_size = SZ_8M;
  38        pr_info("Vulcan PCI: limiting CardBus memory size to %dMB\n",
  39                (int)(pci_cardbus_mem_size >> 20));
  40#endif
  41        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  42        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  43        ixp4xx_pci_preinit();
  44}
  45
  46static int __init vulcan_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  47{
  48        if (slot == 1)
  49                return IXP4XX_GPIO_IRQ(INTA);
  50
  51        if (slot == 2)
  52                return IXP4XX_GPIO_IRQ(INTB);
  53
  54        return -1;
  55}
  56
  57struct hw_pci vulcan_pci __initdata = {
  58        .nr_controllers = 1,
  59        .ops            = &ixp4xx_ops,
  60        .preinit        = vulcan_pci_preinit,
  61        .setup          = ixp4xx_setup,
  62        .map_irq        = vulcan_map_irq,
  63};
  64
  65int __init vulcan_pci_init(void)
  66{
  67        if (machine_is_arcom_vulcan())
  68                pci_common_init(&vulcan_pci);
  69        return 0;
  70}
  71
  72subsys_initcall(vulcan_pci_init);
  73