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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/arm/mach-ixp4xx/nslu2-pci.c
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/*

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 * arch/arm/mach-ixp4xx/nslu2-pci.c

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 *

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 * NSLU2 board-level PCI initialization

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 *

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 * based on ixdp425-pci.c:

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 *	Copyright (C) 2002 Intel Corporation.

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 *	Copyright (C) 2003-2004 MontaVista Software, Inc.

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 *

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 * Maintainer: http://www.nslu2-linux.org/

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License version 2 as

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 * published by the Free Software Foundation.

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 *

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 */

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#include <linux/pci.h>

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#include <linux/init.h>

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#include <linux/irq.h>

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#include <asm/mach/pci.h>

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#include <asm/mach-types.h>

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#define MAX_DEV		3

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#define IRQ_LINES	3

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/* PCI controller GPIO to IRQ pin mappings */

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#define INTA		11

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#define INTB		10

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#define INTC		9

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#define INTD		8

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void __init nslu2_pci_preinit(void)

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{

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	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);

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	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);

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	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);

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	ixp4xx_pci_preinit();

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}

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static int __init nslu2_map_irq(struct pci_dev *dev, u8 slot, u8 pin)

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{

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	static int pci_irq_table[IRQ_LINES] = {

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		IXP4XX_GPIO_IRQ(INTA),

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		IXP4XX_GPIO_IRQ(INTB),

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		IXP4XX_GPIO_IRQ(INTC),

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	};

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	if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)

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		return pci_irq_table[(slot + pin - 2) % IRQ_LINES];

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	return -1;

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}

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struct hw_pci __initdata nslu2_pci = {

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	.nr_controllers = 1,

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	.preinit	= nslu2_pci_preinit,

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	.swizzle	= pci_std_swizzle,

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	.setup		= ixp4xx_setup,

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	.scan		= ixp4xx_scan_bus,

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	.map_irq	= nslu2_map_irq,

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};

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int __init nslu2_pci_init(void) /* monkey see, monkey do */

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{

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	if (machine_is_nslu2())

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		pci_common_init(&nslu2_pci);

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	return 0;

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}

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subsys_initcall(nslu2_pci_init);

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