62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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/*
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* Real Time Clock (RTC) Cache
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*
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* Copyright 2013-2014 IBM Corp.
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*/
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#include <skiboot.h>
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#include <lock.h>
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#include <rtc.h>
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#include <timebase.h>
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static struct lock rtc_tod_lock = LOCK_UNLOCKED;
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static struct {
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struct tm tm;
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unsigned long tb;
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bool valid;
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} rtc_tod_cache;
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void rtc_cache_update(struct tm *tm)
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{
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lock(&rtc_tod_lock);
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rtc_tod_cache.tb = mftb();
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rtc_tod_cache.tm = *tm;
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rtc_tod_cache.valid = true;
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unlock(&rtc_tod_lock);
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}
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int rtc_cache_get(struct tm *tm)
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{
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unsigned long cache_age_sec;
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lock(&rtc_tod_lock);
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if (!rtc_tod_cache.valid) {
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unlock(&rtc_tod_lock);
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return -1;
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}
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cache_age_sec = tb_to_msecs(mftb() - rtc_tod_cache.tb) / 1000;
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*tm = rtc_tod_cache.tm;
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unlock(&rtc_tod_lock);
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tm->tm_sec += cache_age_sec;
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mktime(tm);
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return 0;
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}
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int rtc_cache_get_datetime(uint32_t *year_month_day,
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uint64_t *hour_minute_second_millisecond)
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{
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struct tm tm;
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if (rtc_cache_get(&tm) < 0)
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return -1;
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tm_to_datetime(&tm, year_month_day, hour_minute_second_millisecond);
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return 0;
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}
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