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06470651 MR |
1 | /* |
2 | * linux/drivers/clocksource/dummy_timer.c | |
3 | * | |
4 | * Copyright (C) 2013 ARM Ltd. | |
5 | * All Rights Reserved | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/clockchips.h> | |
12 | #include <linux/cpu.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/percpu.h> | |
15 | #include <linux/cpumask.h> | |
16 | ||
17 | static DEFINE_PER_CPU(struct clock_event_device, dummy_timer_evt); | |
18 | ||
8c37bb3a | 19 | static void dummy_timer_setup(void) |
06470651 MR |
20 | { |
21 | int cpu = smp_processor_id(); | |
22127e93 | 22 | struct clock_event_device *evt = raw_cpu_ptr(&dummy_timer_evt); |
06470651 MR |
23 | |
24 | evt->name = "dummy_timer"; | |
25 | evt->features = CLOCK_EVT_FEAT_PERIODIC | | |
26 | CLOCK_EVT_FEAT_ONESHOT | | |
27 | CLOCK_EVT_FEAT_DUMMY; | |
28 | evt->rating = 100; | |
06470651 MR |
29 | evt->cpumask = cpumask_of(cpu); |
30 | ||
31 | clockevents_register_device(evt); | |
32 | } | |
33 | ||
8c37bb3a | 34 | static int dummy_timer_cpu_notify(struct notifier_block *self, |
06470651 MR |
35 | unsigned long action, void *hcpu) |
36 | { | |
37 | if ((action & ~CPU_TASKS_FROZEN) == CPU_STARTING) | |
38 | dummy_timer_setup(); | |
39 | ||
40 | return NOTIFY_OK; | |
41 | } | |
42 | ||
8c37bb3a | 43 | static struct notifier_block dummy_timer_cpu_nb = { |
06470651 MR |
44 | .notifier_call = dummy_timer_cpu_notify, |
45 | }; | |
46 | ||
47 | static int __init dummy_timer_register(void) | |
48 | { | |
8daa127f SB |
49 | int err = 0; |
50 | ||
51 | cpu_notifier_register_begin(); | |
52 | err = __register_cpu_notifier(&dummy_timer_cpu_nb); | |
06470651 | 53 | if (err) |
8daa127f | 54 | goto out; |
06470651 MR |
55 | |
56 | /* We won't get a call on the boot CPU, so register immediately */ | |
57 | if (num_possible_cpus() > 1) | |
58 | dummy_timer_setup(); | |
59 | ||
8daa127f SB |
60 | out: |
61 | cpu_notifier_register_done(); | |
62 | return err; | |
06470651 MR |
63 | } |
64 | early_initcall(dummy_timer_register); |