diff options
Diffstat (limited to 'arch/mn10300/kernel/rtc.c')
-rw-r--r-- | arch/mn10300/kernel/rtc.c | 46 |
1 files changed, 11 insertions, 35 deletions
diff --git a/arch/mn10300/kernel/rtc.c b/arch/mn10300/kernel/rtc.c index 815a933aafa8..e9e20f9a4dd3 100644 --- a/arch/mn10300/kernel/rtc.c +++ b/arch/mn10300/kernel/rtc.c @@ -20,21 +20,22 @@ DEFINE_SPINLOCK(rtc_lock); EXPORT_SYMBOL(rtc_lock); -/* last time the RTC got updated */ -static long last_rtc_update; - -/* 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); } /* @@ -110,7 +111,7 @@ static int set_rtc_mmss(unsigned long nowtime) int update_persistent_clock(struct timespec now) { - return set_rtc_mms(now.tv_sec); + return set_rtc_mmss(now.tv_sec); } /* @@ -118,39 +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; } |