1/*
2 * arch/arch/mach-ixp4xx/fsg-pci.c
3 *
4 * FSG board-level PCI initialization
5 *
6 * Author: Rod Whitby <rod@whitby.id.au>
7 * Maintainer: http://www.nslu2-linux.org/
8 *
9 * based on ixdp425-pci.c:
10 *	Copyright (C) 2002 Intel Corporation.
11 *	Copyright (C) 2003-2004 MontaVista Software, Inc.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 *
17 */
18
19#include <linux/pci.h>
20#include <linux/init.h>
21#include <linux/irq.h>
22#include <asm/mach/pci.h>
23#include <asm/mach-types.h>
24
25#define MAX_DEV		3
26#define IRQ_LINES	3
27
28/* PCI controller GPIO to IRQ pin mappings */
29#define INTA	6
30#define INTB	7
31#define INTC	5
32
33void __init fsg_pci_preinit(void)
34{
35	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
36	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
37	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
38	ixp4xx_pci_preinit();
39}
40
41static int __init fsg_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
42{
43	static int pci_irq_table[IRQ_LINES] = {
44		IXP4XX_GPIO_IRQ(INTC),
45		IXP4XX_GPIO_IRQ(INTB),
46		IXP4XX_GPIO_IRQ(INTA),
47	};
48
49	int irq = -1;
50	slot -= 11;
51
52	if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
53		irq = pci_irq_table[slot - 1];
54	printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
55	       __func__, slot, pin, irq);
56
57	return irq;
58}
59
60struct hw_pci fsg_pci __initdata = {
61	.nr_controllers = 1,
62	.ops		= &ixp4xx_ops,
63	.preinit =	  fsg_pci_preinit,
64	.setup =	  ixp4xx_setup,
65	.map_irq =	  fsg_map_irq,
66};
67
68int __init fsg_pci_init(void)
69{
70	if (machine_is_fsg())
71		pci_common_init(&fsg_pci);
72	return 0;
73}
74
75subsys_initcall(fsg_pci_init);
76