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