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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * arch/arch/mach-ixp4xx/fsg-pci.c
   4 *
   5 * FSG board-level PCI initialization
   6 *
   7 * Author: Rod Whitby <rod@whitby.id.au>
   8 * Maintainer: http://www.nslu2-linux.org/
   9 *
  10 * based on ixdp425-pci.c:
  11 *      Copyright (C) 2002 Intel Corporation.
  12 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  13 */
  14
  15#include <linux/pci.h>
  16#include <linux/init.h>
  17#include <linux/irq.h>
  18#include <asm/mach/pci.h>
  19#include <asm/mach-types.h>
  20
  21#include "irqs.h"
  22
  23#define MAX_DEV         3
  24#define IRQ_LINES       3
  25
  26/* PCI controller GPIO to IRQ pin mappings */
  27#define INTA    6
  28#define INTB    7
  29#define INTC    5
  30
  31void __init fsg_pci_preinit(void)
  32{
  33        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  34        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  35        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  36        ixp4xx_pci_preinit();
  37}
  38
  39static int __init fsg_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  40{
  41        static int pci_irq_table[IRQ_LINES] = {
  42                IXP4XX_GPIO_IRQ(INTC),
  43                IXP4XX_GPIO_IRQ(INTB),
  44                IXP4XX_GPIO_IRQ(INTA),
  45        };
  46
  47        int irq = -1;
  48        slot -= 11;
  49
  50        if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  51                irq = pci_irq_table[slot - 1];
  52        printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
  53               __func__, slot, pin, irq);
  54
  55        return irq;
  56}
  57
  58struct hw_pci fsg_pci __initdata = {
  59        .nr_controllers = 1,
  60        .ops            = &ixp4xx_ops,
  61        .preinit =        fsg_pci_preinit,
  62        .setup =          ixp4xx_setup,
  63        .map_irq =        fsg_map_irq,
  64};
  65
  66int __init fsg_pci_init(void)
  67{
  68        if (machine_is_fsg())
  69                pci_common_init(&fsg_pci);
  70        return 0;
  71}
  72
  73subsys_initcall(fsg_pci_init);
  74