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Diffstat (limited to 'arch/mn10300/kernel/rtc.c')
-rw-r--r--arch/mn10300/kernel/rtc.c41
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;
}