1 files changed, 10 insertions, 31 deletions

diff --git a/arch/mn10300/kernel/rtc.c b/arch/mn10300/kernel/rtc.c
index 4eef0e7224f6..e9e20f9a4dd3 100644
--- a/arch/mn10300/kernel/rtc.c
+++ b/arch/mn10300/kernel/rtc.c
@@ -20,18 +20,22 @@
 DEFINE_SPINLOCK(rtc_lock);
 EXPORT_SYMBOL(rtc_lock);
 
-/* time for RTC to update itself in ioclks */
-static unsigned long mn10300_rtc_update_period;
-
+/*
+ * Read the current RTC time
+ */
 void read_persistent_clock(struct timespec *ts)
 {
         struct rtc_time tm;
 
         get_rtc_time(&tm);
 
-        ts->tv_sec = mktime(tm.tm_year, tm.tm_mon, tm.tm_mday,
-                      tm.tm_hour, tm.tm_min, tm.tm_sec);
         ts->tv_nsec = 0;
+        ts->tv_sec = mktime(tm.tm_year, tm.tm_mon, tm.tm_mday,
+                            tm.tm_hour, tm.tm_min, tm.tm_sec);
+
+        /* if rtc is way off in the past, set something reasonable */
+        if (ts->tv_sec < 0)
+                ts->tv_sec = mktime(2009, 1, 1, 12, 0, 0);
 }
 
 /*
@@ -115,39 +119,14 @@ int update_persistent_clock(struct timespec now)
  */
 void __init calibrate_clock(void)
 {
-        unsigned long count0, counth, count1;
         unsigned char status;
 
         /* make sure the RTC is running and is set to operate in 24hr mode */
         status = RTSRC;
         RTCRB |= RTCRB_SET;
         RTCRB |= RTCRB_TM_24HR;
+        RTCRB &= ~RTCRB_DM_BINARY;
         RTCRA |= RTCRA_DVR;
         RTCRA &= ~RTCRA_DVR;
         RTCRB &= ~RTCRB_SET;
-
-        /* work out the clock speed by counting clock cycles between ends of
-         * the RTC update cycle - track the RTC through one complete update
-         * cycle (1 second)
-         */
-        startup_timestamp_counter();
-
-        while (!(RTCRA & RTCRA_UIP)) {}
-        while ((RTCRA & RTCRA_UIP)) {}
-
-        count0 = TMTSCBC;
-
-        while (!(RTCRA & RTCRA_UIP)) {}
-
-        counth = TMTSCBC;
-
-        while ((RTCRA & RTCRA_UIP)) {}
-
-        count1 = TMTSCBC;
-
-        shutdown_timestamp_counter();
-
-        MN10300_TSCCLK = count0 - count1; /* the timers count down */
-        mn10300_rtc_update_period = counth - count1;
-        MN10300_TSC_PER_HZ = MN10300_TSCCLK / HZ;
 }