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Alessandro Zummoa7918f32005-11-10 14:05:04 +00001/*
2 * arch/arm/mach-ixp4xx/nslu2-pci.c
3 *
4 * NSLU2 board-level PCI initialization
5 *
6 * based on ixdp425-pci.c:
7 * Copyright (C) 2002 Intel Corporation.
8 * Copyright (C) 2003-2004 MontaVista Software, Inc.
9 *
10 * Maintainer: http://www.nslu2-linux.org/
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17
Alessandro Zummoa7918f32005-11-10 14:05:04 +000018#include <linux/pci.h>
19#include <linux/init.h>
Martin Michlmayrf64c2c02006-09-06 19:03:24 +010020#include <linux/irq.h>
Alessandro Zummoa7918f32005-11-10 14:05:04 +000021
22#include <asm/mach/pci.h>
23#include <asm/mach-types.h>
24
25void __init nslu2_pci_preinit(void)
26{
Dmitry Baryshkov6cab4862008-07-27 04:23:31 +010027 set_irq_type(IRQ_NSLU2_PCI_INTA, IRQ_TYPE_LEVEL_LOW);
28 set_irq_type(IRQ_NSLU2_PCI_INTB, IRQ_TYPE_LEVEL_LOW);
29 set_irq_type(IRQ_NSLU2_PCI_INTC, IRQ_TYPE_LEVEL_LOW);
Alessandro Zummoa7918f32005-11-10 14:05:04 +000030
Alessandro Zummoa7918f32005-11-10 14:05:04 +000031 ixp4xx_pci_preinit();
32}
33
34static int __init nslu2_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
35{
36 static int pci_irq_table[NSLU2_PCI_IRQ_LINES] = {
37 IRQ_NSLU2_PCI_INTA,
38 IRQ_NSLU2_PCI_INTB,
39 IRQ_NSLU2_PCI_INTC,
40 };
41
42 int irq = -1;
43
44 if (slot >= 1 && slot <= NSLU2_PCI_MAX_DEV &&
45 pin >= 1 && pin <= NSLU2_PCI_IRQ_LINES) {
46 irq = pci_irq_table[(slot + pin - 2) % NSLU2_PCI_IRQ_LINES];
47 }
48
49 return irq;
50}
51
52struct hw_pci __initdata nslu2_pci = {
53 .nr_controllers = 1,
54 .preinit = nslu2_pci_preinit,
55 .swizzle = pci_std_swizzle,
56 .setup = ixp4xx_setup,
57 .scan = ixp4xx_scan_bus,
58 .map_irq = nslu2_map_irq,
59};
60
61int __init nslu2_pci_init(void) /* monkey see, monkey do */
62{
63 if (machine_is_nslu2())
64 pci_common_init(&nslu2_pci);
65
66 return 0;
67}
68
69subsys_initcall(nslu2_pci_init);