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

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

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 *

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 * Gateworks Avila board-level PCI initialization

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 *

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 * Author: Michael-Luke Jones <[email protected]>

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 *

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 * Based on ixdp-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: Deepak Saxena <[email protected]>

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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/kernel.h>

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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 <linux/delay.h>

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#include <asm/mach/pci.h>

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#include <asm/irq.h>

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#include <mach/hardware.h>

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#include <asm/mach-types.h>

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#define AVILA_MAX_DEV	4

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#define LOFT_MAX_DEV	6

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#define IRQ_LINES	4

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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 avila_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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	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);

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	ixp4xx_pci_preinit();

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}

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static int __init avila_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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		IXP4XX_GPIO_IRQ(INTD)

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	};

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	if (slot >= 1 &&

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	    slot <= (machine_is_loft() ? LOFT_MAX_DEV : AVILA_MAX_DEV) &&

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	    pin >= 1 && pin <= IRQ_LINES)

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		return pci_irq_table[(slot + pin - 2) % 4];

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	return -1;

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}

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struct hw_pci avila_pci __initdata = {

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	.nr_controllers = 1,

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	.preinit	= avila_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	= avila_map_irq,

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};

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int __init avila_pci_init(void)

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{

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	if (machine_is_avila() || machine_is_loft())

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		pci_common_init(&avila_pci);

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	return 0;

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}

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subsys_initcall(avila_pci_init);

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