| 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 | } |