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Linux/arch/arm/kernel/arch_timer.c

  1 /*
  2  *  linux/arch/arm/kernel/arch_timer.c
  3  *
  4  *  Copyright (C) 2011 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/init.h>
 12 #include <linux/types.h>
 13 #include <linux/errno.h>
 14 
 15 #include <asm/delay.h>
 16 
 17 #include <clocksource/arm_arch_timer.h>
 18 
 19 static unsigned long arch_timer_read_counter_long(void)
 20 {
 21         return arch_timer_read_counter();
 22 }
 23 
 24 static struct delay_timer arch_delay_timer;
 25 
 26 static void __init arch_timer_delay_timer_register(void)
 27 {
 28         /* Use the architected timer for the delay loop. */
 29         arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
 30         arch_delay_timer.freq = arch_timer_get_rate();
 31         register_current_timer_delay(&arch_delay_timer);
 32 }
 33 
 34 int __init arch_timer_arch_init(void)
 35 {
 36         u32 arch_timer_rate = arch_timer_get_rate();
 37 
 38         if (arch_timer_rate == 0)
 39                 return -ENXIO;
 40 
 41         arch_timer_delay_timer_register();
 42 
 43         return 0;
 44 }
 45 

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