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

   1/*
   2 * arch/arm/mach-ixp4xx/avila-pci.c
   3 *
   4 * Gateworks Avila board-level PCI initialization
   5 *
   6 * Author: Michael-Luke Jones <mlj28@cam.ac.uk>
   7 *
   8 * Based on ixdp-pci.c
   9 * Copyright (C) 2002 Intel Corporation.
  10 * Copyright (C) 2003-2004 MontaVista Software, Inc.
  11 *
  12 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License version 2 as
  16 * published by the Free Software Foundation.
  17 *
  18 */
  19
  20#include <linux/kernel.h>
  21#include <linux/pci.h>
  22#include <linux/init.h>
  23#include <linux/irq.h>
  24#include <linux/delay.h>
  25#include <asm/mach/pci.h>
  26#include <asm/irq.h>
  27#include <mach/hardware.h>
  28#include <asm/mach-types.h>
  29
  30#define AVILA_MAX_DEV   4
  31#define LOFT_MAX_DEV    6
  32#define IRQ_LINES       4
  33
  34/* PCI controller GPIO to IRQ pin mappings */
  35#define INTA            11
  36#define INTB            10
  37#define INTC            9
  38#define INTD            8
  39
  40void __init avila_pci_preinit(void)
  41{
  42        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  43        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  44        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  45        irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  46        ixp4xx_pci_preinit();
  47}
  48
  49static int __init avila_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  50{
  51        static int pci_irq_table[IRQ_LINES] = {
  52                IXP4XX_GPIO_IRQ(INTA),
  53                IXP4XX_GPIO_IRQ(INTB),
  54                IXP4XX_GPIO_IRQ(INTC),
  55                IXP4XX_GPIO_IRQ(INTD)
  56        };
  57
  58        if (slot >= 1 &&
  59            slot <= (machine_is_loft() ? LOFT_MAX_DEV : AVILA_MAX_DEV) &&
  60            pin >= 1 && pin <= IRQ_LINES)
  61                return pci_irq_table[(slot + pin - 2) % 4];
  62
  63        return -1;
  64}
  65
  66struct hw_pci avila_pci __initdata = {
  67        .nr_controllers = 1,
  68        .ops            = &ixp4xx_ops,
  69        .preinit        = avila_pci_preinit,
  70        .setup          = ixp4xx_setup,
  71        .map_irq        = avila_map_irq,
  72};
  73
  74int __init avila_pci_init(void)
  75{
  76        if (machine_is_avila() || machine_is_loft())
  77                pci_common_init(&avila_pci);
  78        return 0;
  79}
  80
  81subsys_initcall(avila_pci_init);
  82