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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * arch/arm/mach-ixp4xx/nslu2-pci.c
   4 *
   5 * NSLU2 board-level PCI initialization
   6 *
   7 * based on ixdp425-pci.c:
   8 *      Copyright (C) 2002 Intel Corporation.
   9 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  10 *
  11 * Maintainer: http://www.nslu2-linux.org/
  12 */
  13
  14#include <linux/pci.h>
  15#include <linux/init.h>
  16#include <linux/irq.h>
  17#include <asm/mach/pci.h>
  18#include <asm/mach-types.h>
  19
  20#include "irqs.h"
  21
  22#define MAX_DEV         3
  23#define IRQ_LINES       3
  24
  25/* PCI controller GPIO to IRQ pin mappings */
  26#define INTA            11
  27#define INTB            10
  28#define INTC            9
  29#define INTD            8
  30
  31void __init nslu2_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 nslu2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  40{
  41        static int pci_irq_table[IRQ_LINES] = {
  42                IXP4XX_GPIO_IRQ(INTA),
  43                IXP4XX_GPIO_IRQ(INTB),
  44                IXP4XX_GPIO_IRQ(INTC),
  45        };
  46
  47        if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  48                return pci_irq_table[(slot + pin - 2) % IRQ_LINES];
  49
  50        return -1;
  51}
  52
  53struct hw_pci __initdata nslu2_pci = {
  54        .nr_controllers = 1,
  55        .ops            = &ixp4xx_ops,
  56        .preinit        = nslu2_pci_preinit,
  57        .setup          = ixp4xx_setup,
  58        .map_irq        = nslu2_map_irq,
  59};
  60
  61int __init nslu2_pci_init(void) /* monkey see, monkey do */
  62{
  63        if (machine_is_nslu2())
  64                pci_common_init(&nslu2_pci);
  65
  66        return 0;
  67}
  68
  69subsys_initcall(nslu2_pci_init);
  70