Commit | Line | Data |
---|---|---|
e7ba176b HS |
1 | /* |
2 | * Copyright (C) 2007 Atmel Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | #include <linux/delay.h> | |
9 | #include <linux/kdebug.h> | |
10 | #include <linux/notifier.h> | |
11 | #include <linux/sched.h> | |
12 | ||
13 | #include <asm/irq.h> | |
14 | ||
15 | enum nmi_action { | |
16 | NMI_SHOW_STATE = 1 << 0, | |
17 | NMI_SHOW_REGS = 1 << 1, | |
18 | NMI_DIE = 1 << 2, | |
19 | NMI_DEBOUNCE = 1 << 3, | |
20 | }; | |
21 | ||
22 | static unsigned long nmi_actions; | |
23 | ||
24 | static int nmi_debug_notify(struct notifier_block *self, | |
25 | unsigned long val, void *data) | |
26 | { | |
27 | struct die_args *args = data; | |
28 | ||
29 | if (likely(val != DIE_NMI)) | |
30 | return NOTIFY_DONE; | |
31 | ||
32 | if (nmi_actions & NMI_SHOW_STATE) | |
33 | show_state(); | |
34 | if (nmi_actions & NMI_SHOW_REGS) | |
35 | show_regs(args->regs); | |
36 | if (nmi_actions & NMI_DEBOUNCE) | |
37 | mdelay(10); | |
38 | if (nmi_actions & NMI_DIE) | |
39 | return NOTIFY_BAD; | |
40 | ||
41 | return NOTIFY_OK; | |
42 | } | |
43 | ||
44 | static struct notifier_block nmi_debug_nb = { | |
45 | .notifier_call = nmi_debug_notify, | |
46 | }; | |
47 | ||
48 | static int __init nmi_debug_setup(char *str) | |
49 | { | |
50 | char *p, *sep; | |
51 | ||
52 | register_die_notifier(&nmi_debug_nb); | |
53 | if (nmi_enable()) { | |
54 | printk(KERN_WARNING "Unable to enable NMI.\n"); | |
55 | return 0; | |
56 | } | |
57 | ||
58 | if (*str != '=') | |
59 | return 0; | |
60 | ||
61 | for (p = str + 1; *p; p = sep + 1) { | |
62 | sep = strchr(p, ','); | |
63 | if (sep) | |
64 | *sep = 0; | |
65 | if (strcmp(p, "state") == 0) | |
66 | nmi_actions |= NMI_SHOW_STATE; | |
67 | else if (strcmp(p, "regs") == 0) | |
68 | nmi_actions |= NMI_SHOW_REGS; | |
69 | else if (strcmp(p, "debounce") == 0) | |
70 | nmi_actions |= NMI_DEBOUNCE; | |
71 | else if (strcmp(p, "die") == 0) | |
72 | nmi_actions |= NMI_DIE; | |
73 | else | |
74 | printk(KERN_WARNING "NMI: Unrecognized action `%s'\n", | |
75 | p); | |
76 | if (!sep) | |
77 | break; | |
78 | } | |
79 | ||
80 | return 0; | |
81 | } | |
82 | __setup("nmi_debug", nmi_debug_setup); |