1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * arch/arm/mach-ixp4xx/avila-pci.c
4 *
5 * Gateworks Avila board-level PCI initialization
6 *
7 * Author: Michael-Luke Jones <mlj28@cam.ac.uk>
8 *
9 * Based on ixdp-pci.c
10 * Copyright (C) 2002 Intel Corporation.
11 * Copyright (C) 2003-2004 MontaVista Software, Inc.
12 *
13 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
14 */
15
16#include <linux/kernel.h>
17#include <linux/pci.h>
18#include <linux/init.h>
19#include <linux/irq.h>
20#include <linux/delay.h>
21#include <asm/mach/pci.h>
22#include <asm/irq.h>
23#include <mach/hardware.h>
24#include <asm/mach-types.h>
25
26#include "irqs.h"
27
28#define AVILA_MAX_DEV	4
29#define LOFT_MAX_DEV	6
30#define IRQ_LINES	4
31
32/* PCI controller GPIO to IRQ pin mappings */
33#define INTA		11
34#define INTB		10
35#define INTC		9
36#define INTD		8
37
38void __init avila_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
47static int __init avila_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 &&
57	    slot <= (machine_is_loft() ? LOFT_MAX_DEV : AVILA_MAX_DEV) &&
58	    pin >= 1 && pin <= IRQ_LINES)
59		return pci_irq_table[(slot + pin - 2) % 4];
60
61	return -1;
62}
63
64struct hw_pci avila_pci __initdata = {
65	.nr_controllers = 1,
66	.ops		= &ixp4xx_ops,
67	.preinit	= avila_pci_preinit,
68	.setup		= ixp4xx_setup,
69	.map_irq	= avila_map_irq,
70};
71
72int __init avila_pci_init(void)
73{
74	if (machine_is_avila() || machine_is_loft())
75		pci_common_init(&avila_pci);
76	return 0;
77}
78
79subsys_initcall(avila_pci_init);
80