1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
4 * Copyright (C) 2005-2006, Thomas Gleixner, Russell King
5 *
6 * This file contains the dummy interrupt chip implementation
7 */
8 #include <linux/interrupt.h>
9 #include <linux/irq.h>
10 #include <linux/export.h>
11
12 #include "internals.h"
13
14 /*
15 * What should we do if we get a hw irq event on an illegal vector?
16 * Each architecture has to answer this themselves.
17 */
18 static void ack_bad(struct irq_data *data)
19 {
20 struct irq_desc *desc = irq_data_to_desc(data);
21
22 print_irq_desc(data->irq, desc);
23 ack_bad_irq(data->irq);
24 }
25
26 /*
27 * NOP functions
28 */
29 static void noop(struct irq_data *data) { }
30
31 static unsigned int noop_ret(struct irq_data *data)
32 {
33 return 0;
34 }
35
36 /*
37 * Generic no controller implementation
38 */
39 struct irq_chip no_irq_chip = {
40 .name = "none",
41 .irq_startup = noop_ret,
42 .irq_shutdown = noop,
43 .irq_enable = noop,
44 .irq_disable = noop,
45 .irq_ack = ack_bad,
46 .flags = IRQCHIP_SKIP_SET_WAKE,
47 };
48
49 /*
50 * Generic dummy implementation which can be used for
51 * real dumb interrupt sources
52 */
53 struct irq_chip dummy_irq_chip = {
54 .name = "dummy",
55 .irq_startup = noop_ret,
56 .irq_shutdown = noop,
57 .irq_enable = noop,
58 .irq_disable = noop,
59 .irq_ack = noop,
60 .irq_mask = noop,
61 .irq_unmask = noop,
62 .flags = IRQCHIP_SKIP_SET_WAKE,
63 };
64 EXPORT_SYMBOL_GPL(dummy_irq_chip);
65
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