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