2019-06-04 01:11:33 -07:00
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// SPDX-License-Identifier: GPL-2.0-only
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2012-01-11 10:25:17 -07:00
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/*
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* linux/arch/arm/kernel/arch_timer.c
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*
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* Copyright (C) 2011 ARM Ltd.
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* All Rights Reserved
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*/
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#include <linux/init.h>
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2012-11-12 07:33:44 -07:00
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#include <linux/types.h>
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2013-02-14 09:45:25 -07:00
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#include <linux/errno.h>
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2012-01-11 10:25:17 -07:00
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2012-09-21 10:51:44 -07:00
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#include <asm/delay.h>
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2019-10-07 06:56:40 -07:00
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#include <asm/arch_timer.h>
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2012-01-11 10:25:17 -07:00
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2012-11-12 07:33:44 -07:00
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#include <clocksource/arm_arch_timer.h>
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2012-09-07 10:09:57 -07:00
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2012-11-12 07:33:44 -07:00
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static unsigned long arch_timer_read_counter_long(void)
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{
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2012-11-14 02:50:19 -07:00
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return arch_timer_read_counter();
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2012-01-11 10:25:17 -07:00
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}
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2012-11-12 07:33:44 -07:00
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static struct delay_timer arch_delay_timer;
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2012-01-20 03:47:00 -07:00
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2012-11-12 07:33:44 -07:00
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static void __init arch_timer_delay_timer_register(void)
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2012-01-11 10:25:17 -07:00
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{
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2012-09-21 10:51:44 -07:00
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/* Use the architected timer for the delay loop. */
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2012-11-12 07:33:44 -07:00
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arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
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arch_delay_timer.freq = arch_timer_get_rate();
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2012-09-21 10:51:44 -07:00
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register_current_timer_delay(&arch_delay_timer);
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2012-01-11 10:25:17 -07:00
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}
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2011-01-14 08:32:36 -07:00
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2013-04-10 16:27:51 -07:00
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int __init arch_timer_arch_init(void)
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2011-01-14 08:32:36 -07:00
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{
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2013-03-11 14:23:46 -07:00
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u32 arch_timer_rate = arch_timer_get_rate();
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if (arch_timer_rate == 0)
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2012-11-12 07:33:44 -07:00
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return -ENXIO;
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2011-01-14 08:32:36 -07:00
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2013-04-10 16:27:51 -07:00
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arch_timer_delay_timer_register();
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2011-01-14 08:32:36 -07:00
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return 0;
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}
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