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avila-pci.c

/*
 * arch/arm/mach-ixp4xx/avila-pci.c
 *
 * Gateworks Avila board-level PCI initialization
 *
 * Author: Michael-Luke Jones <mlj28@cam.ac.uk>
 *
 * Based on ixdp-pci.c
 * Copyright (C) 2002 Intel Corporation.
 * Copyright (C) 2003-2004 MontaVista Software, Inc.
 *
 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <asm/mach/pci.h>
#include <asm/irq.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>

#define AVILA_MAX_DEV   4
#define LOFT_MAX_DEV    6
#define IRQ_LINES 4

/* PCI controller GPIO to IRQ pin mappings */
#define INTA            11
#define INTB            10
#define INTC            9
#define INTD            8

void __init avila_pci_preinit(void)
{
      set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
      set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
      set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
      set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
      ixp4xx_pci_preinit();
}

static int __init avila_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
      static int pci_irq_table[IRQ_LINES] = {
            IXP4XX_GPIO_IRQ(INTA),
            IXP4XX_GPIO_IRQ(INTB),
            IXP4XX_GPIO_IRQ(INTC),
            IXP4XX_GPIO_IRQ(INTD)
      };

      if (slot >= 1 &&
          slot <= (machine_is_loft() ? LOFT_MAX_DEV : AVILA_MAX_DEV) &&
          pin >= 1 && pin <= IRQ_LINES)
            return pci_irq_table[(slot + pin - 2) % 4];

      return -1;
}

struct hw_pci avila_pci __initdata = {
      .nr_controllers = 1,
      .preinit    = avila_pci_preinit,
      .swizzle    = pci_std_swizzle,
      .setup            = ixp4xx_setup,
      .scan       = ixp4xx_scan_bus,
      .map_irq    = avila_map_irq,
};

int __init avila_pci_init(void)
{
      if (machine_is_avila() || machine_is_loft())
            pci_common_init(&avila_pci);
      return 0;
}

subsys_initcall(avila_pci_init);

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