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Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Alessandro Zummoa7918f32005-11-10 14:05:04 +00002/*
3 * arch/arm/mach-ixp4xx/nslu2-pci.c
4 *
5 * NSLU2 board-level PCI initialization
6 *
7 * based on ixdp425-pci.c:
8 * Copyright (C) 2002 Intel Corporation.
9 * Copyright (C) 2003-2004 MontaVista Software, Inc.
10 *
11 * Maintainer: http://www.nslu2-linux.org/
Alessandro Zummoa7918f32005-11-10 14:05:04 +000012 */
13
Alessandro Zummoa7918f32005-11-10 14:05:04 +000014#include <linux/pci.h>
15#include <linux/init.h>
Martin Michlmayrf64c2c02006-09-06 19:03:24 +010016#include <linux/irq.h>
Alessandro Zummoa7918f32005-11-10 14:05:04 +000017#include <asm/mach/pci.h>
18#include <asm/mach-types.h>
19
Linus Walleijdc8ef8cd2018-12-29 15:47:52 +010020#include "irqs.h"
21
Krzysztof Hałasa8d3fdf32009-11-17 18:48:23 +010022#define MAX_DEV 3
23#define IRQ_LINES 3
Krzysztof Hałasac1117c62009-11-16 16:02:02 +010024
25/* PCI controller GPIO to IRQ pin mappings */
Krzysztof Hałasa8d3fdf32009-11-17 18:48:23 +010026#define INTA 11
27#define INTB 10
28#define INTC 9
29#define INTD 8
Krzysztof Hałasac1117c62009-11-16 16:02:02 +010030
Alessandro Zummoa7918f32005-11-10 14:05:04 +000031void __init nslu2_pci_preinit(void)
32{
Thomas Gleixner6845664a2011-03-24 13:25:22 +010033 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
34 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
35 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
Alessandro Zummoa7918f32005-11-10 14:05:04 +000036 ixp4xx_pci_preinit();
37}
38
Ralf Baechled5341942011-06-10 15:30:21 +010039static int __init nslu2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
Alessandro Zummoa7918f32005-11-10 14:05:04 +000040{
Krzysztof Hałasa8d3fdf32009-11-17 18:48:23 +010041 static int pci_irq_table[IRQ_LINES] = {
42 IXP4XX_GPIO_IRQ(INTA),
43 IXP4XX_GPIO_IRQ(INTB),
44 IXP4XX_GPIO_IRQ(INTC),
Alessandro Zummoa7918f32005-11-10 14:05:04 +000045 };
46
Krzysztof Hałasa8d3fdf32009-11-17 18:48:23 +010047 if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
48 return pci_irq_table[(slot + pin - 2) % IRQ_LINES];
Alessandro Zummoa7918f32005-11-10 14:05:04 +000049
Krzysztof Hałasa8d3fdf32009-11-17 18:48:23 +010050 return -1;
Alessandro Zummoa7918f32005-11-10 14:05:04 +000051}
52
53struct hw_pci __initdata nslu2_pci = {
54 .nr_controllers = 1,
Russell Kingc23bfc32012-03-10 12:49:16 +000055 .ops = &ixp4xx_ops,
Alessandro Zummoa7918f32005-11-10 14:05:04 +000056 .preinit = nslu2_pci_preinit,
Alessandro Zummoa7918f32005-11-10 14:05:04 +000057 .setup = ixp4xx_setup,
Alessandro Zummoa7918f32005-11-10 14:05:04 +000058 .map_irq = nslu2_map_irq,
59};
60
61int __init nslu2_pci_init(void) /* monkey see, monkey do */
62{
63 if (machine_is_nslu2())
64 pci_common_init(&nslu2_pci);
65
66 return 0;
67}
68
69subsys_initcall(nslu2_pci_init);