1 /*
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
18 #include <linux/pci.h>
19 #include <linux/init.h>
20 #include <linux/irq.h>
21 #include <asm/mach/pci.h>
22 #include <asm/mach-types.h>
23
24 #define MAX_DEV 3
25 #define IRQ_LINES 3
26
27 /* PCI controller GPIO to IRQ pin mappings */
28 #define INTA 11
29 #define INTB 10
30 #define INTC 9
31 #define INTD 8
32
nslu2_pci_preinit(void)33 void __init nslu2_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
nslu2_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)41 static int __init nslu2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
42 {
43 static int pci_irq_table[IRQ_LINES] = {
44 IXP4XX_GPIO_IRQ(INTA),
45 IXP4XX_GPIO_IRQ(INTB),
46 IXP4XX_GPIO_IRQ(INTC),
47 };
48
49 if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
50 return pci_irq_table[(slot + pin - 2) % IRQ_LINES];
51
52 return -1;
53 }
54
55 struct hw_pci __initdata nslu2_pci = {
56 .nr_controllers = 1,
57 .preinit = nslu2_pci_preinit,
58 .swizzle = pci_std_swizzle,
59 .setup = ixp4xx_setup,
60 .scan = ixp4xx_scan_bus,
61 .map_irq = nslu2_map_irq,
62 };
63
nslu2_pci_init(void)64 int __init nslu2_pci_init(void) /* monkey see, monkey do */
65 {
66 if (machine_is_nslu2())
67 pci_common_init(&nslu2_pci);
68
69 return 0;
70 }
71
72 subsys_initcall(nslu2_pci_init);
73