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(irq: data->irq, desc); |
23 | ack_bad_irq(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 | |