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
10 #include "internals.h"
11
12 /*
13 * What should we do if we get a hw irq event on an illegal vector?
14 * Each architecture has to answer this themself.
15 */
ack_bad(struct irq_data * data)16 static void ack_bad(struct irq_data *data)
17 {
18 struct irq_desc *desc = irq_data_to_desc(data);
19
20 print_irq_desc(data->irq, desc);
21 ack_bad_irq(data->irq);
22 }
23
24 /*
25 * NOP functions
26 */
noop(struct irq_data * data)27 static void noop(struct irq_data *data) { }
28
noop_ret(struct irq_data * data)29 static unsigned int noop_ret(struct irq_data *data)
30 {
31 return 0;
32 }
33
34 /*
35 * Generic no controller implementation
36 */
37 struct irq_chip no_irq_chip = {
38 .name = "none",
39 .irq_startup = noop_ret,
40 .irq_shutdown = noop,
41 .irq_enable = noop,
42 .irq_disable = noop,
43 .irq_ack = ack_bad,
44 };
45
46 /*
47 * Generic dummy implementation which can be used for
48 * real dumb interrupt sources
49 */
50 struct irq_chip dummy_irq_chip = {
51 .name = "dummy",
52 .irq_startup = noop_ret,
53 .irq_shutdown = noop,
54 .irq_enable = noop,
55 .irq_disable = noop,
56 .irq_ack = noop,
57 .irq_mask = noop,
58 .irq_unmask = noop,
59 };
60