[SPARC64]: Synchronize RTC clock via timer just like x86.

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

1 files changed, 48 insertions, 18 deletions

diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c
index f84da4f1b706..d457079118dc 100644
--- a/arch/sparc64/kernel/time.c
+++ b/arch/sparc64/kernel/time.c
@@ -435,22 +435,56 @@ static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
 
 #define TICK_SIZE (tick_nsec / 1000)
 
-static inline void timer_check_rtc(void)
+#define USEC_AFTER      500000
+#define USEC_BEFORE     500000
+
+static void sync_cmos_clock(unsigned long dummy);
+
+static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+
+static void sync_cmos_clock(unsigned long dummy)
 {
-        /* last time the cmos clock got updated */
-        static long last_rtc_update;
-
-        /* Determine when to update the Mostek clock. */
-        if (ntp_synced() &&
-            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 */
+        struct timeval now, next;
+        int fail = 1;
+
+        /*
+         * 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.
+         * This code is run on a timer.  If the clock is set, that timer
+         * may not expire at the correct time.  Thus, we adjust...
+         */
+        if (!ntp_synced())
+                /*
+                 * Not synced, exit, do not restart a timer (if one is
+                 * running, let it run out).
+                 */
+                return;
+
+        do_gettimeofday(&now);
+        if (now.tv_usec >= USEC_AFTER - ((unsigned) TICK_SIZE) / 2 &&
+            now.tv_usec <= USEC_BEFORE + ((unsigned) TICK_SIZE) / 2)
+                fail = set_rtc_mmss(now.tv_sec);
+
+        next.tv_usec = USEC_AFTER - now.tv_usec;
+        if (next.tv_usec <= 0)
+                next.tv_usec += USEC_PER_SEC;
+
+        if (!fail)
+                next.tv_sec = 659;
+        else
+                next.tv_sec = 0;
+
+        if (next.tv_usec >= USEC_PER_SEC) {
+                next.tv_sec++;
+                next.tv_usec -= USEC_PER_SEC;
         }
+        mod_timer(&sync_cmos_timer, jiffies + timeval_to_jiffies(&next));
+}
+
+void notify_arch_cmos_timer(void)
+{
+        mod_timer(&sync_cmos_timer, jiffies + 1);
 }
 
 irqreturn_t timer_interrupt(int irq, void *dev_id)
@@ -483,8 +517,6 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
                                      : "r" (pstate));
         } while (time_after_eq(ticks, compare));
 
-        timer_check_rtc();
-
         write_sequnlock(&xtime_lock);
 
         return IRQ_HANDLED;
@@ -497,8 +529,6 @@ void timer_tick_interrupt(struct pt_regs *regs)
 
         do_timer(1);
 
-        timer_check_rtc();
-
         write_sequnlock(&xtime_lock);
 }
 #endif