| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * linux/drivers/clocksource/dummy_timer.c |
| 4 | * |
| 5 | * Copyright (C) 2013 ARM Ltd. |
| 6 | * All Rights Reserved |
| 7 | */ |
| 8 | #include <linux/clockchips.h> |
| 9 | #include <linux/cpu.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/percpu.h> |
| 12 | #include <linux/cpumask.h> |
| 13 | |
| 14 | static DEFINE_PER_CPU(struct clock_event_device, dummy_timer_evt); |
| 15 | |
| 16 | static int dummy_timer_starting_cpu(unsigned int cpu) |
| 17 | { |
| 18 | struct clock_event_device *evt = per_cpu_ptr(&dummy_timer_evt, cpu); |
| 19 | |
| 20 | evt->name = "dummy_timer"; |
| 21 | evt->features = CLOCK_EVT_FEAT_PERIODIC | |
| 22 | CLOCK_EVT_FEAT_ONESHOT | |
| 23 | CLOCK_EVT_FEAT_DUMMY; |
| 24 | evt->rating = 100; |
| 25 | evt->cpumask = cpumask_of(cpu); |
| 26 | |
| 27 | clockevents_register_device(dev: evt); |
| 28 | return 0; |
| 29 | } |
| 30 | |
| 31 | static int __init dummy_timer_register(void) |
| 32 | { |
| 33 | return cpuhp_setup_state(state: CPUHP_AP_DUMMY_TIMER_STARTING, |
| 34 | name: "clockevents/dummy_timer:starting", |
| 35 | startup: dummy_timer_starting_cpu, NULL); |
| 36 | } |
| 37 | early_initcall(dummy_timer_register); |
| 38 |