[SPARC64]: Use time interpolators.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc64/Kconfig

@@ -12,6 +12,10 @@ config MMU
 	bool
 	default y
 
+config TIME_INTERPOLATION
+	bool
+	default y
+
 source "init/Kconfig"
 
 menu "General machine setup"

arch/sparc64/kernel/time.c

@@ -431,7 +431,6 @@ static struct sparc64_tick_ops hbtick_operations = {
 unsigned long timer_tick_offset;
 unsigned long timer_tick_compare;
 
-static unsigned long timer_ticks_per_usec_quotient;
 static unsigned long timer_ticks_per_nsec_quotient;
 
 #define TICK_SIZE (tick_nsec / 1000)
@@ -1025,18 +1024,22 @@ static int sparc64_cpufreq_notifier(struct notifier_block *nb, unsigned long val
 static struct notifier_block sparc64_cpufreq_notifier_block = {
 	.notifier_call	= sparc64_cpufreq_notifier
 };
-#endif
+
+#endif /* CONFIG_CPU_FREQ */
+
+static struct time_interpolator sparc64_cpu_interpolator = {
+	.source		=	TIME_SOURCE_CPU,
+	.shift		=	16,
+};
 
 /* The quotient formula is taken from the IA64 port. */
-#define SPARC64_USEC_PER_CYC_SHIFT	30UL
 #define SPARC64_NSEC_PER_CYC_SHIFT	30UL
 void __init time_init(void)
 {
 	unsigned long clock = sparc64_init_timers(timer_interrupt);
 
-	timer_ticks_per_usec_quotient =
-		(((1000000UL << SPARC64_USEC_PER_CYC_SHIFT) +
-		  (clock / 2)) / clock);
+	sparc64_cpu_interpolator.frequency = clock;
+	register_time_interpolator(&sparc64_cpu_interpolator);
 
 	timer_ticks_per_nsec_quotient =
 		(((NSEC_PER_SEC << SPARC64_NSEC_PER_CYC_SHIFT) +
@@ -1048,17 +1051,6 @@ void __init time_init(void)
 #endif
 }
 
-static __inline__ unsigned long do_gettimeoffset(void)
-{
-	unsigned long ticks = tick_ops->get_tick();
-
-	ticks += timer_tick_offset;
-	ticks -= timer_tick_compare;
-
-	return (ticks * timer_ticks_per_usec_quotient)
-		>> SPARC64_USEC_PER_CYC_SHIFT;
-}
-
 unsigned long long sched_clock(void)
 {
 	unsigned long ticks = tick_ops->get_tick();
@@ -1067,100 +1059,6 @@ unsigned long long sched_clock(void)
 		>> SPARC64_NSEC_PER_CYC_SHIFT;
 }
 
-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;
-
-	if (this_is_starfire)
-		return 0;
-
-	write_seqlock_irq(&xtime_lock);
-	/*
-	 * This is revolting. We need to set "xtime" correctly. However, the
-	 * value in this location is the value at the most recent update of
-	 * wall time.  Discover what correction gettimeofday() would have
-	 * made, and then undo it!
-	 */
-	nsec -= do_gettimeoffset() * 1000;
-	nsec -= (jiffies - wall_jiffies) * (NSEC_PER_SEC / HZ);
-
-	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;
-}
-
-EXPORT_SYMBOL(do_settimeofday);
-
-/* Ok, my cute asm atomicity trick doesn't work anymore.
- * There are just too many variables that need to be protected
- * now (both members of xtime, wall_jiffies, et al.)
- */
-void do_gettimeofday(struct timeval *tv)
-{
-	unsigned long seq;
-	unsigned long usec, sec;
-	unsigned long max_ntp_tick = tick_usec - tickadj;
-
-	do {
-		unsigned long lost;
-
-		seq = read_seqbegin(&xtime_lock);
-		usec = do_gettimeoffset();
-		lost = jiffies - wall_jiffies;
-
-		/*
-		 * If time_adjust is negative then NTP is slowing the clock
-		 * so make sure not to go into next possible interval.
-		 * Better to lose some accuracy than have time go backwards..
-		 */
-		if (unlikely(time_adjust < 0)) {
-			usec = min(usec, max_ntp_tick);
-
-			if (lost)
-				usec += lost * max_ntp_tick;
-		}
-		else if (unlikely(lost))
-			usec += lost * tick_usec;
-
-		sec = xtime.tv_sec;
-
-		/* Believe it or not, this divide shows up on
-		 * kernel profiles.  The problem is that it is
-		 * both 64-bit and signed.  Happily, 32-bits
-		 * of precision is all we really need and in
-		 * doing so gcc ends up emitting a cheap multiply.
-		 *
-		 * XXX Why is tv_nsec 'long' and 'signed' in
-		 * XXX the first place, can it even be negative?
-		 */
-		usec += ((unsigned int) xtime.tv_nsec / 1000U);
-	} while (read_seqretry(&xtime_lock, seq));
-
-	while (usec >= 1000000) {
-		usec -= 1000000;
-		sec++;
-	}
-
-	tv->tv_sec = sec;
-	tv->tv_usec = usec;
-}
-
-EXPORT_SYMBOL(do_gettimeofday);
-
 static int set_rtc_mmss(unsigned long nowtime)
 {
 	int real_seconds, real_minutes, chip_minutes;