1 /*
2 * arch/arm/mach-ixp4xx/ixdp425-pci.c
3 *
4 * IXDP425 board-level PCI initialization
5 *
6 * Copyright (C) 2002 Intel Corporation.
7 * Copyright (C) 2003-2004 MontaVista Software, Inc.
8 *
9 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pci.h>
19 #include <linux/init.h>
20 #include <linux/irq.h>
21 #include <linux/delay.h>
22 #include <asm/mach/pci.h>
23 #include <asm/irq.h>
24 #include <mach/hardware.h>
25 #include <asm/mach-types.h>
26
27 #define MAX_DEV 4
28 #define IRQ_LINES 4
29
30 /* PCI controller GPIO to IRQ pin mappings */
31 #define INTA 11
32 #define INTB 10
33 #define INTC 9
34 #define INTD 8
35
36
ixdp425_pci_preinit(void)37 void __init ixdp425_pci_preinit(void)
38 {
39 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
40 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
41 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
42 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
43 ixp4xx_pci_preinit();
44 }
45
ixdp425_map_irq(struct pci_dev * dev,u8 slot,u8 pin)46 static int __init ixdp425_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
47 {
48 static int pci_irq_table[IRQ_LINES] = {
49 IXP4XX_GPIO_IRQ(INTA),
50 IXP4XX_GPIO_IRQ(INTB),
51 IXP4XX_GPIO_IRQ(INTC),
52 IXP4XX_GPIO_IRQ(INTD)
53 };
54
55 if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
56 return pci_irq_table[(slot + pin - 2) % 4];
57
58 return -1;
59 }
60
61 struct hw_pci ixdp425_pci __initdata = {
62 .nr_controllers = 1,
63 .preinit = ixdp425_pci_preinit,
64 .swizzle = pci_std_swizzle,
65 .setup = ixp4xx_setup,
66 .scan = ixp4xx_scan_bus,
67 .map_irq = ixdp425_map_irq,
68 };
69
ixdp425_pci_init(void)70 int __init ixdp425_pci_init(void)
71 {
72 if (machine_is_ixdp425() || machine_is_ixcdp1100() ||
73 machine_is_ixdp465() || machine_is_kixrp435())
74 pci_common_init(&ixdp425_pci);
75 return 0;
76 }
77
78 subsys_initcall(ixdp425_pci_init);
79