1/*
2 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
3 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
4 *
5 * This file contains the dummy interrupt chip implementation
6 */
7#include <linux/interrupt.h>
8#include <linux/irq.h>
9#include <linux/export.h>
10
11#include "internals.h"
12
13/*
14 * What should we do if we get a hw irq event on an illegal vector?
15 * Each architecture has to answer this themself.
16 */
17static void ack_bad(struct irq_data *data)
18{
19	struct irq_desc *desc = irq_data_to_desc(data);
20
21	print_irq_desc(data->irq, desc);
22	ack_bad_irq(data->irq);
23}
24
25/*
26 * NOP functions
27 */
28static void noop(struct irq_data *data) { }
29
30static unsigned int noop_ret(struct irq_data *data)
31{
32	return 0;
33}
34
35/*
36 * Generic no controller implementation
37 */
38struct irq_chip no_irq_chip = {
39	.name		= "none",
40	.irq_startup	= noop_ret,
41	.irq_shutdown	= noop,
42	.irq_enable	= noop,
43	.irq_disable	= noop,
44	.irq_ack	= ack_bad,
45};
46
47/*
48 * Generic dummy implementation which can be used for
49 * real dumb interrupt sources
50 */
51struct irq_chip dummy_irq_chip = {
52	.name		= "dummy",
53	.irq_startup	= noop_ret,
54	.irq_shutdown	= noop,
55	.irq_enable	= noop,
56	.irq_disable	= noop,
57	.irq_ack	= noop,
58	.irq_mask	= noop,
59	.irq_unmask	= noop,
60	.flags		= IRQCHIP_SKIP_SET_WAKE,
61};
62EXPORT_SYMBOL_GPL(dummy_irq_chip);
63