From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/m68k/kernel/time.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 arch/m68k/kernel/time.c

(limited to 'arch/m68k/kernel/time.c')

diff --git a/arch/m68k/kernel/time.c b/arch/m68k/kernel/time.c
new file mode 100644
index 00000000..bea6bcf8
--- /dev/null
+++ b/arch/m68k/kernel/time.c
@@ -0,0 +1,103 @@
+/*
+ *  linux/arch/m68k/kernel/time.c
+ *
+ *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ *
+ * This file contains the m68k-specific time handling details.
+ * Most of the stuff is located in the machine specific files.
+ *
+ * 1997-09-10	Updated NTP code according to technical memorandum Jan '96
+ *		"A Kernel Model for Precision Timekeeping" by Dave Mills
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/irq_regs.h>
+
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/profile.h>
+
+/*
+ * timer_interrupt() needs to keep up the real-time clock,
+ * as well as call the "xtime_update()" routine every clocktick
+ */
+static irqreturn_t timer_interrupt(int irq, void *dummy)
+{
+	xtime_update(1);
+	update_process_times(user_mode(get_irq_regs()));
+	profile_tick(CPU_PROFILING);
+
+#ifdef CONFIG_HEARTBEAT
+	/* use power LED as a heartbeat instead -- much more useful
+	   for debugging -- based on the version for PReP by Cort */
+	/* acts like an actual heart beat -- ie thump-thump-pause... */
+	if (mach_heartbeat) {
+	    static unsigned cnt = 0, period = 0, dist = 0;
+
+	    if (cnt == 0 || cnt == dist)
+		mach_heartbeat( 1 );
+	    else if (cnt == 7 || cnt == dist+7)
+		mach_heartbeat( 0 );
+
+	    if (++cnt > period) {
+		cnt = 0;
+		/* The hyperbolic function below modifies the heartbeat period
+		 * length in dependency of the current (5min) load. It goes
+		 * through the points f(0)=126, f(1)=86, f(5)=51,
+		 * f(inf)->30. */
+		period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
+		dist = period / 4;
+	    }
+	}
+#endif /* CONFIG_HEARTBEAT */
+	return IRQ_HANDLED;
+}
+
+void read_persistent_clock(struct timespec *ts)
+{
+	struct rtc_time time;
+	ts->tv_sec = 0;
+	ts->tv_nsec = 0;
+
+	if (mach_hwclk) {
+		mach_hwclk(0, &time);
+
+		if ((time.tm_year += 1900) < 1970)
+			time.tm_year += 100;
+		ts->tv_sec = mktime(time.tm_year, time.tm_mon, time.tm_mday,
+				      time.tm_hour, time.tm_min, time.tm_sec);
+	}
+}
+
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
+
+static int __init rtc_init(void)
+{
+	struct platform_device *pdev;
+
+	if (!mach_hwclk)
+		return -ENODEV;
+
+	pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
+	return PTR_RET(pdev);
+}
+
+module_init(rtc_init);
+
+#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
+
+void __init time_init(void)
+{
+	mach_sched_init(timer_interrupt);
+}
-- 
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