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63216d3c23
The rtc_lock is used by both the nvram and rtc drivers, so we need to export it if at least one of the two is built, not just for the rtc driver. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
157 lines
3.1 KiB
C
157 lines
3.1 KiB
C
/*
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* linux/arch/arm/kernel/time.c
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*
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* Copyright (C) 1991, 1992, 1995 Linus Torvalds
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* Modifications for ARM (C) 1994-2001 Russell King
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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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* This file contains the ARM-specific time handling details:
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* reading the RTC at bootup, etc...
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/timex.h>
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#include <linux/errno.h>
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#include <linux/profile.h>
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#include <linux/syscore_ops.h>
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#include <linux/timer.h>
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#include <linux/irq.h>
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#include <linux/mc146818rtc.h>
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#include <asm/leds.h>
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#include <asm/thread_info.h>
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#include <asm/sched_clock.h>
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#include <asm/stacktrace.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/time.h>
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/*
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* Our system timer.
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*/
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static struct sys_timer *system_timer;
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#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || \
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defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE)
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/* this needs a better home */
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DEFINE_SPINLOCK(rtc_lock);
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EXPORT_SYMBOL(rtc_lock);
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#endif /* pc-style 'CMOS' RTC support */
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/* change this if you have some constant time drift */
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#define USECS_PER_JIFFY (1000000/HZ)
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#ifdef CONFIG_SMP
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unsigned long profile_pc(struct pt_regs *regs)
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{
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struct stackframe frame;
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if (!in_lock_functions(regs->ARM_pc))
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return regs->ARM_pc;
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frame.fp = regs->ARM_fp;
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frame.sp = regs->ARM_sp;
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frame.lr = regs->ARM_lr;
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frame.pc = regs->ARM_pc;
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do {
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int ret = unwind_frame(&frame);
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if (ret < 0)
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return 0;
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} while (in_lock_functions(frame.pc));
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return frame.pc;
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}
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EXPORT_SYMBOL(profile_pc);
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#endif
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#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
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u32 arch_gettimeoffset(void)
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{
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if (system_timer->offset != NULL)
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return system_timer->offset() * 1000;
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return 0;
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}
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#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
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#ifdef CONFIG_LEDS_TIMER
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static inline void do_leds(void)
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{
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static unsigned int count = HZ/2;
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if (--count == 0) {
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count = HZ/2;
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leds_event(led_timer);
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}
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}
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#else
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#define do_leds()
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#endif
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#ifndef CONFIG_GENERIC_CLOCKEVENTS
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/*
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* Kernel system timer support.
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*/
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void timer_tick(void)
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{
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profile_tick(CPU_PROFILING);
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do_leds();
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xtime_update(1);
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#ifndef CONFIG_SMP
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update_process_times(user_mode(get_irq_regs()));
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#endif
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}
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#endif
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#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
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static int timer_suspend(void)
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{
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if (system_timer->suspend)
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system_timer->suspend();
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return 0;
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}
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static void timer_resume(void)
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{
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if (system_timer->resume)
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system_timer->resume();
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}
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#else
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#define timer_suspend NULL
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#define timer_resume NULL
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#endif
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static struct syscore_ops timer_syscore_ops = {
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.suspend = timer_suspend,
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.resume = timer_resume,
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};
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static int __init timer_init_syscore_ops(void)
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{
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register_syscore_ops(&timer_syscore_ops);
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return 0;
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}
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device_initcall(timer_init_syscore_ops);
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void __init time_init(void)
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{
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system_timer = machine_desc->timer;
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system_timer->init();
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#ifdef CONFIG_HAVE_SCHED_CLOCK
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sched_clock_postinit();
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#endif
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}
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