diff options
Diffstat (limited to 'payloads/libpayload/drivers/nvram.c')
| -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); + } +} |