From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/kernel/time.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 arch/arm/kernel/time.c

(limited to 'arch/arm/kernel/time.c')

diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
new file mode 100644
index 00000000..cb634c3e
--- /dev/null
+++ b/arch/arm/kernel/time.c
@@ -0,0 +1,158 @@
+/*
+ *  linux/arch/arm/kernel/time.c
+ *
+ *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ *  Modifications for ARM (C) 1994-2001 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  This file contains the ARM-specific time handling details:
+ *  reading the RTC at bootup, etc...
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/timex.h>
+#include <linux/errno.h>
+#include <linux/profile.h>
+#include <linux/syscore_ops.h>
+#include <linux/timer.h>
+#include <linux/irq.h>
+
+#include <linux/mc146818rtc.h>
+
+#include <asm/leds.h>
+#include <asm/thread_info.h>
+#include <asm/sched_clock.h>
+#include <asm/stacktrace.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+
+/*
+ * Our system timer.
+ */
+static struct sys_timer *system_timer;
+
+#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
+/* this needs a better home */
+DEFINE_SPINLOCK(rtc_lock);
+
+#ifdef CONFIG_RTC_DRV_CMOS_MODULE
+EXPORT_SYMBOL(rtc_lock);
+#endif
+#endif	/* pc-style 'CMOS' RTC support */
+
+/* change this if you have some constant time drift */
+#define USECS_PER_JIFFY	(1000000/HZ)
+
+#ifdef CONFIG_SMP
+unsigned long profile_pc(struct pt_regs *regs)
+{
+	struct stackframe frame;
+
+	if (!in_lock_functions(regs->ARM_pc))
+		return regs->ARM_pc;
+
+	frame.fp = regs->ARM_fp;
+	frame.sp = regs->ARM_sp;
+	frame.lr = regs->ARM_lr;
+	frame.pc = regs->ARM_pc;
+	do {
+		int ret = unwind_frame(&frame);
+		if (ret < 0)
+			return 0;
+	} while (in_lock_functions(frame.pc));
+
+	return frame.pc;
+}
+EXPORT_SYMBOL(profile_pc);
+#endif
+
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
+u32 arch_gettimeoffset(void)
+{
+	if (system_timer->offset != NULL)
+		return system_timer->offset() * 1000;
+
+	return 0;
+}
+#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
+
+#ifdef CONFIG_LEDS_TIMER
+static inline void do_leds(void)
+{
+	static unsigned int count = HZ/2;
+
+	if (--count == 0) {
+		count = HZ/2;
+		leds_event(led_timer);
+	}
+}
+#else
+#define	do_leds()
+#endif
+
+
+#ifndef CONFIG_GENERIC_CLOCKEVENTS
+/*
+ * Kernel system timer support.
+ */
+void timer_tick(void)
+{
+	profile_tick(CPU_PROFILING);
+	do_leds();
+	xtime_update(1);
+#ifndef CONFIG_SMP
+	update_process_times(user_mode(get_irq_regs()));
+#endif
+}
+#endif
+
+#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
+static int timer_suspend(void)
+{
+	if (system_timer->suspend)
+		system_timer->suspend();
+
+	return 0;
+}
+
+static void timer_resume(void)
+{
+	if (system_timer->resume)
+		system_timer->resume();
+}
+#else
+#define timer_suspend NULL
+#define timer_resume NULL
+#endif
+
+static struct syscore_ops timer_syscore_ops = {
+	.suspend	= timer_suspend,
+	.resume		= timer_resume,
+};
+
+static int __init timer_init_syscore_ops(void)
+{
+	register_syscore_ops(&timer_syscore_ops);
+
+	return 0;
+}
+
+device_initcall(timer_init_syscore_ops);
+
+void __init time_init(void)
+{
+	system_timer = machine_desc->timer;
+	system_timer->init();
+#ifdef CONFIG_HAVE_SCHED_CLOCK
+	sched_clock_postinit();
+#endif
+}
+
-- 
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