Merge tag 'jfs-3.7' of git://github.com/kleikamp/linux-shaggy
[platform/adaptation/renesas_rcar/renesas_kernel.git] / kernel / irq / dummychip.c
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  */
17 static 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  */
28 static void noop(struct irq_data *data) { }
29
30 static unsigned int noop_ret(struct irq_data *data)
31 {
32         return 0;
33 }
34
35 /*
36  * Generic no controller implementation
37  */
38 struct 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  */
51 struct 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 };
61 EXPORT_SYMBOL_GPL(dummy_irq_chip);