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1 /*
2  * Dummy local timer
3  *
4  * Copyright (C) 2008  Paul Mundt
5  *
6  * cloned from:
7  *
8  *  linux/arch/arm/mach-realview/localtimer.c
9  *
10  *  Copyright (C) 2002 ARM Ltd.
11  *  All Rights Reserved
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the GNU General Public License version 2 as
15  * published by the Free Software Foundation.
16  */
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/delay.h>
20 #include <linux/device.h>
21 #include <linux/smp.h>
22 #include <linux/jiffies.h>
23 #include <linux/percpu.h>
24 #include <linux/clockchips.h>
25 #include <linux/hardirq.h>
26 #include <linux/irq.h>
27 
28 static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
29 
30 /*
31  * Used on SMP for either the local timer or SMP_MSG_TIMER
32  */
local_timer_interrupt(void)33 void local_timer_interrupt(void)
34 {
35 	struct clock_event_device *clk = this_cpu_ptr(&local_clockevent);
36 
37 	irq_enter();
38 	clk->event_handler(clk);
39 	irq_exit();
40 }
41 
local_timer_setup(unsigned int cpu)42 void local_timer_setup(unsigned int cpu)
43 {
44 	struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
45 
46 	clk->name		= "dummy_timer";
47 	clk->features		= CLOCK_EVT_FEAT_ONESHOT |
48 				  CLOCK_EVT_FEAT_PERIODIC |
49 				  CLOCK_EVT_FEAT_DUMMY;
50 	clk->rating		= 400;
51 	clk->mult		= 1;
52 	clk->broadcast		= smp_timer_broadcast;
53 	clk->cpumask		= cpumask_of(cpu);
54 
55 	clockevents_register_device(clk);
56 }
57 
local_timer_stop(unsigned int cpu)58 void local_timer_stop(unsigned int cpu)
59 {
60 }
61