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| author | Patrick Rudolph <siro@das-labor.org> | 2018-02-03 11:50:56 +0100 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-03-23 08:35:31 +0000 |
| commit | 77e0baa6e99761462af4c69c7beda0af9571525e (patch) | |
| tree | 734a29e0d1e681ad1d1fa251e9cdbb7862e7e5bc /payloads/libpayload/drivers | |
| parent | 0beddb5e237f23c59399b1c93f25230a6eab3372 (diff) | |
| download | coreboot-77e0baa6e99761462af4c69c7beda0af9571525e.tar.xz | |
libpayload/drivers/nvram: Add function to write RTC
Add a function to set the RTC to provided struct tm.
Change-Id: I17b4c1ee0dcc649738ac6a7400b087d07213eaf0
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/23585
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'payloads/libpayload/drivers')
| -rw-r--r-- | payloads/libpayload/drivers/nvram.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/nvram.c b/payloads/libpayload/drivers/nvram.c index 34ee0331e1..0196bb5c7c 100644 --- a/payloads/libpayload/drivers/nvram.c +++ b/payloads/libpayload/drivers/nvram.c @@ -160,3 +160,55 @@ void rtc_read_clock(struct tm *time) if (time->tm_year < 80) time->tm_year += 100; } + +/** + * Write the current time and date to the RTC + * + * @param time A pointer to a broken-down time structure + */ +void rtc_write_clock(const struct tm *time) +{ + u16 timeout = 10000; + u8 statusB; + u8 reg8, year; + + while (nvram_updating()) + if (!timeout--) + return; + + statusB = nvram_read(NVRAM_RTC_STATUSB); + + year = time->tm_year; + if (year > 100) + year -= 100; + + if (!(statusB & NVRAM_RTC_FORMAT_BINARY)) { + nvram_write(dec2bcd(time->tm_mon + 1), NVRAM_RTC_MONTH); + nvram_write(dec2bcd(time->tm_sec), NVRAM_RTC_SECONDS); + nvram_write(dec2bcd(time->tm_min), NVRAM_RTC_MINUTES); + nvram_write(dec2bcd(time->tm_mday), NVRAM_RTC_DAY); + if (!(statusB & NVRAM_RTC_FORMAT_24HOUR)) { + if (time->tm_hour > 12) + reg8 = dec2bcd(time->tm_hour - 12) | 0x80; + else + reg8 = dec2bcd(time->tm_hour); + } else + reg8 = dec2bcd(time->tm_hour); + nvram_write(reg8, NVRAM_RTC_HOURS); + nvram_write(dec2bcd(year), NVRAM_RTC_YEAR); + } else { + nvram_write(time->tm_mon + 1, NVRAM_RTC_MONTH); + nvram_write(time->tm_sec, NVRAM_RTC_SECONDS); + nvram_write(time->tm_min, NVRAM_RTC_MINUTES); + nvram_write(time->tm_mday, NVRAM_RTC_DAY); + if (!(statusB & NVRAM_RTC_FORMAT_24HOUR)) { + if (time->tm_hour > 12) + reg8 = (time->tm_hour - 12) | 0x80; + else + reg8 = time->tm_hour; + } else + reg8 = time->tm_hour; + nvram_write(reg8, NVRAM_RTC_HOURS); + nvram_write(year, NVRAM_RTC_YEAR); + } +} |