1 /*
2 * arch/arm/mach-ixp4xx/miccpt-pci.c
3 *
4 * MICCPT board-level PCI initialization
5 *
6 * Copyright (C) 2002 Intel Corporation.
7 * Copyright (C) 2003-2004 MontaVista Software, Inc.
8 * Copyright (C) 2006 OMICRON electronics GmbH
9 *
10 * Author: Michael Jochum <michael.jochum@omicron.at>
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/kernel.h>
19 #include <linux/pci.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22 #include <linux/irq.h>
23 #include <asm/mach/pci.h>
24 #include <asm/irq.h>
25 #include <mach/hardware.h>
26 #include <asm/mach-types.h>
27
28 #define MAX_DEV 4
29 #define IRQ_LINES 4
30
31 /* PCI controller GPIO to IRQ pin mappings */
32 #define INTA 1
33 #define INTB 2
34 #define INTC 3
35 #define INTD 4
36
37
miccpt_pci_preinit(void)38 void __init miccpt_pci_preinit(void)
39 {
40 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
41 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
42 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
43 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
44 ixp4xx_pci_preinit();
45 }
46
miccpt_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)47 static int __init miccpt_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
48 {
49 static int pci_irq_table[IRQ_LINES] = {
50 IXP4XX_GPIO_IRQ(INTA),
51 IXP4XX_GPIO_IRQ(INTB),
52 IXP4XX_GPIO_IRQ(INTC),
53 IXP4XX_GPIO_IRQ(INTD)
54 };
55
56 if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
57 return pci_irq_table[(slot + pin - 2) % 4];
58
59 return -1;
60 }
61
62 struct hw_pci miccpt_pci __initdata = {
63 .nr_controllers = 1,
64 .ops = &ixp4xx_ops,
65 .preinit = miccpt_pci_preinit,
66 .setup = ixp4xx_setup,
67 .map_irq = miccpt_map_irq,
68 };
69
miccpt_pci_init(void)70 int __init miccpt_pci_init(void)
71 {
72 if (machine_is_miccpt())
73 pci_common_init(&miccpt_pci);
74 return 0;
75 }
76
77 subsys_initcall(miccpt_pci_init);
78
