1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * arch/arm/mach-ixp4xx/miccpt-pci.c
4 *
5 * MICCPT board-level PCI initialization
6 *
7 * Copyright (C) 2002 Intel Corporation.
8 * Copyright (C) 2003-2004 MontaVista Software, Inc.
9 * Copyright (C) 2006 OMICRON electronics GmbH
10 *
11 * Author: Michael Jochum <michael.jochum@omicron.at>
12 */
13
14#include <linux/kernel.h>
15#include <linux/pci.h>
16#include <linux/init.h>
17#include <linux/delay.h>
18#include <linux/irq.h>
19#include <asm/mach/pci.h>
20#include <asm/irq.h>
21#include <mach/hardware.h>
22#include <asm/mach-types.h>
23
24#include "irqs.h"
25
26#define MAX_DEV		4
27#define IRQ_LINES	4
28
29/* PCI controller GPIO to IRQ pin mappings */
30#define INTA		1
31#define INTB		2
32#define INTC		3
33#define INTD		4
34
35
36void __init miccpt_pci_preinit(void)
37{
38	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
39	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
40	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
41	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
42	ixp4xx_pci_preinit();
43}
44
45static int __init miccpt_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
46{
47	static int pci_irq_table[IRQ_LINES] = {
48		IXP4XX_GPIO_IRQ(INTA),
49		IXP4XX_GPIO_IRQ(INTB),
50		IXP4XX_GPIO_IRQ(INTC),
51		IXP4XX_GPIO_IRQ(INTD)
52	};
53
54	if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
55		return pci_irq_table[(slot + pin - 2) % 4];
56
57	return -1;
58}
59
60struct hw_pci miccpt_pci __initdata = {
61	.nr_controllers = 1,
62	.ops		= &ixp4xx_ops,
63	.preinit	= miccpt_pci_preinit,
64	.setup		= ixp4xx_setup,
65	.map_irq	= miccpt_map_irq,
66};
67
68int __init miccpt_pci_init(void)
69{
70	if (machine_is_miccpt())
71		pci_common_init(&miccpt_pci);
72	return 0;
73}
74
75subsys_initcall(miccpt_pci_init);
76