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8a4da6e36c
The core functionality of the arch_timer driver is not directly tied to anything under arch/arm, and can be split out. This patch factors out the core of the arch_timer driver, so it can be shared with other architectures. A couple of functions are added so that architecture-specific code can interact with the driver without needing to touch its internals. The ARM_ARCH_TIMER config variable is moved out to drivers/clocksource/Kconfig, existing uses in arch/arm are replaced with HAVE_ARM_ARCH_TIMER, which selects it. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <asm/delay.h>
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#include <asm/sched_clock.h>
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#include <clocksource/arm_arch_timer.h>
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static unsigned long arch_timer_read_counter_long(void)
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{
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return arch_timer_read_counter();
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}
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static u32 arch_timer_read_counter_u32(void)
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{
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return arch_timer_read_counter();
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}
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static struct delay_timer arch_delay_timer;
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static void __init arch_timer_delay_timer_register(void)
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{
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/* Use the architected timer for the delay loop. */
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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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register_current_timer_delay(&arch_delay_timer);
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}
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int __init arch_timer_of_register(void)
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{
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int ret;
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ret = arch_timer_init();
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if (ret)
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return ret;
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arch_timer_delay_timer_register();
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return 0;
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}
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int __init arch_timer_sched_clock_init(void)
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{
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if (arch_timer_get_rate() == 0)
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return -ENXIO;
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setup_sched_clock(arch_timer_read_counter_u32,
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32, arch_timer_get_rate());
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return 0;
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}
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