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