1 files changed, 198 insertions, 0 deletions

diff --git a/arch/m68knommu/kernel/time.c b/arch/m68knommu/kernel/time.c
new file mode 100644
index 000000000000..5c3ca671627c
--- /dev/null
+++ b/arch/m68knommu/kernel/time.c
@@ -0,0 +1,198 @@
+/*
+ *  linux/arch/m68knommu/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/config.h>
+#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/profile.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+
+#include <asm/machdep.h>
+#include <asm/io.h>
+
+#define TICK_SIZE (tick_nsec / 1000)
+
+u64 jiffies_64 = INITIAL_JIFFIES;
+
+EXPORT_SYMBOL(jiffies_64);
+
+extern unsigned long wall_jiffies;
+
+
+static inline int set_rtc_mmss(unsigned long nowtime)
+{
+        if (mach_set_clock_mmss)
+                return mach_set_clock_mmss (nowtime);
+        return -1;
+}
+
+/*
+ * timer_interrupt() needs to keep up the real-time clock,
+ * as well as call the "do_timer()" routine every clocktick
+ */
+static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
+{
+        /* last time the cmos clock got updated */
+        static long last_rtc_update=0;
+
+        /* may need to kick the hardware timer */
+        if (mach_tick)
+          mach_tick();
+
+        write_seqlock(&xtime_lock);
+
+        do_timer(regs);
+#ifndef CONFIG_SMP
+        update_process_times(user_mode(regs));
+#endif
+        if (current->pid)
+                profile_tick(CPU_PROFILING, regs);
+
+        /*
+         * If we have an externally synchronized Linux clock, then update
+         * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
+         * called as close as possible to 500 ms before the new second starts.
+         */
+        if ((time_status & STA_UNSYNC) == 0 &&
+            xtime.tv_sec > last_rtc_update + 660 &&
+            (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
+            (xtime.tv_nsec  / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
+          if (set_rtc_mmss(xtime.tv_sec) == 0)
+            last_rtc_update = xtime.tv_sec;
+          else
+            last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
+        }
+#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 */
+
+        write_sequnlock(&xtime_lock);
+        return(IRQ_HANDLED);
+}
+
+void time_init(void)
+{
+        unsigned int year, mon, day, hour, min, sec;
+
+        extern void arch_gettod(int *year, int *mon, int *day, int *hour,
+                                int *min, int *sec);
+
+        arch_gettod(&year, &mon, &day, &hour, &min, &sec);
+
+        if ((year += 1900) < 1970)
+                year += 100;
+        xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
+        xtime.tv_nsec = 0;
+        wall_to_monotonic.tv_sec = -xtime.tv_sec;
+
+        mach_sched_init(timer_interrupt);
+}
+
+/*
+ * This version of gettimeofday has near microsecond resolution.
+ */
+void do_gettimeofday(struct timeval *tv)
+{
+        unsigned long flags;
+        unsigned long lost, seq;
+        unsigned long usec, sec;
+
+        do {
+                seq = read_seqbegin_irqsave(&xtime_lock, flags);
+                usec = mach_gettimeoffset ? mach_gettimeoffset() : 0;
+                lost = jiffies - wall_jiffies;
+                if (lost)
+                        usec += lost * (1000000 / HZ);
+                sec = xtime.tv_sec;
+                usec += (xtime.tv_nsec / 1000);
+        } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
+
+        while (usec >= 1000000) {
+                usec -= 1000000;
+                sec++;
+        }
+
+        tv->tv_sec = sec;
+        tv->tv_usec = usec;
+}
+
+EXPORT_SYMBOL(do_gettimeofday);
+
+int do_settimeofday(struct timespec *tv)
+{
+        time_t wtm_sec, sec = tv->tv_sec;
+        long wtm_nsec, nsec = tv->tv_nsec;
+
+        if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
+                return -EINVAL;
+
+        write_seqlock_irq(&xtime_lock);
+        /*
+         * This is revolting. We need to set the xtime.tv_usec
+         * correctly. However, the value in this location is
+         * is value at the last tick.
+         * Discover what correction gettimeofday
+         * would have done, and then undo it!
+         */
+        if (mach_gettimeoffset)
+                nsec -= (mach_gettimeoffset() * 1000);
+
+        wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
+        wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
+
+        set_normalized_timespec(&xtime, sec, nsec);
+        set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
+
+        time_adjust = 0;                /* stop active adjtime() */
+        time_status |= STA_UNSYNC;
+        time_maxerror = NTP_PHASE_LIMIT;
+        time_esterror = NTP_PHASE_LIMIT;
+        write_sequnlock_irq(&xtime_lock);
+        clock_was_set();
+        return 0;
+}
+
+/*
+ * Scheduler clock - returns current time in nanosec units.
+ */
+unsigned long long sched_clock(void)
+{
+        return (unsigned long long)jiffies * (1000000000 / HZ);
+}
+
+EXPORT_SYMBOL(do_settimeofday);