summaryrefslogtreecommitdiff
path: root/payloads/libpayload
diff options
context:
space:
mode:
Diffstat (limited to 'payloads/libpayload')
-rw-r--r--payloads/libpayload/drivers/nvram.c52
-rw-r--r--payloads/libpayload/include/libpayload.h1
2 files changed, 53 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);
+ }
+}
diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h
index 74969726bf..e3f8fd363f 100644
--- a/payloads/libpayload/include/libpayload.h
+++ b/payloads/libpayload/include/libpayload.h
@@ -151,6 +151,7 @@ u8 nvram_read(u8 addr);
void nvram_write(u8 val, u8 addr);
int nvram_updating(void);
void rtc_read_clock(struct tm *tm);
+void rtc_write_clock(const struct tm *tm);
/** @} */
/**