1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/kernel/arch_timer.c 4 * 5 * Copyright (C) 2011 ARM Ltd. 6 * All Rights Reserved 7 */ 8 #include <linux/init.h> 9 #include <linux/types.h> 10 #include <linux/errno.h> 11 12 #include <asm/delay.h> 13 14 #include <clocksource/arm_arch_timer.h> 15 16 static unsigned long arch_timer_read_counter_long(void) 17 { 18 return arch_timer_read_counter(); 19 } 20 21 static struct delay_timer arch_delay_timer; 22 23 static void __init arch_timer_delay_timer_register(void) 24 { 25 /* Use the architected timer for the delay loop. */ 26 arch_delay_timer.read_current_timer = arch_timer_read_counter_long; 27 arch_delay_timer.freq = arch_timer_get_rate(); 28 register_current_timer_delay(&arch_delay_timer); 29 } 30 31 int __init arch_timer_arch_init(void) 32 { 33 u32 arch_timer_rate = arch_timer_get_rate(); 34 35 if (arch_timer_rate == 0) 36 return -ENXIO; 37 38 arch_timer_delay_timer_register(); 39 40 return 0; 41 } 42