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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * arch/arm/mach-ixp4xx/miccpt-pci.c
   4 *
   5 * MICCPT board-level PCI initialization
   6 *
   7 * Copyright (C) 2002 Intel Corporation.
   8 * Copyright (C) 2003-2004 MontaVista Software, Inc.
   9 * Copyright (C) 2006 OMICRON electronics GmbH
  10 *
  11 * Author: Michael Jochum <michael.jochum@omicron.at>
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/pci.h>
  16#include <linux/init.h>
  17#include <linux/delay.h>
  18#include <linux/irq.h>
  19#include <asm/mach/pci.h>
  20#include <asm/irq.h>
  21#include <mach/hardware.h>
  22#include <asm/mach-types.h>
  23
  24#include "irqs.h"
  25
  26#define MAX_DEV         4
  27#define IRQ_LINES       4
  28
  29/* PCI controller GPIO to IRQ pin mappings */
  30#define INTA            1
  31#define INTB            2
  32#define INTC            3
  33#define INTD            4
  34
  35
  36void __init miccpt_pci_preinit(void)
  37{
  38        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  39        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  40        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  41        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  42        ixp4xx_pci_preinit();
  43}
  44
  45static int __init miccpt_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  46{
  47        static int pci_irq_table[IRQ_LINES] = {
  48                IXP4XX_GPIO_IRQ(INTA),
  49                IXP4XX_GPIO_IRQ(INTB),
  50                IXP4XX_GPIO_IRQ(INTC),
  51                IXP4XX_GPIO_IRQ(INTD)
  52        };
  53
  54        if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  55                return pci_irq_table[(slot + pin - 2) % 4];
  56
  57        return -1;
  58}
  59
  60struct hw_pci miccpt_pci __initdata = {
  61        .nr_controllers = 1,
  62        .ops            = &ixp4xx_ops,
  63        .preinit        = miccpt_pci_preinit,
  64        .setup          = ixp4xx_setup,
  65        .map_irq        = miccpt_map_irq,
  66};
  67
  68int __init miccpt_pci_init(void)
  69{
  70        if (machine_is_miccpt())
  71                pci_common_init(&miccpt_pci);
  72        return 0;
  73}
  74
  75subsys_initcall(miccpt_pci_init);
  76