[coreboot-gerrit] Patch set updated for coreboot: commonlib: Add real-time-clock functions
Martin Roth (martinroth@google.com)
gerrit at coreboot.org
Wed Jun 22 18:17:00 CEST 2016
Martin Roth (martinroth at google.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15301
-gerrit
commit 702bb567a16d20f36a08f4254bf0d0dc841479e7
Author: Simon Glass <sjg at chromium.org>
Date: Fri Jun 10 20:58:24 2016 -0600
commonlib: Add real-time-clock functions
Add functions to convert between seconds and a struct rtc_time. Also
add a function that can display the time on the console.
BUG=chrome-os-partner:52220
BRANCH=none
TEST=(partial) with future commits and after setting RTC on the EC:
boot on gru into linux shell, check firmware log:
localhost ~ # grep Date: /sys/firmware/log
Date: 2016-06-20 (Monday) Time: 18:01:44
Then reboot ~10 seconds and check again:
localhost ~ # grep Date: /sys/firmware/log
Date: 2016-06-20 (Monday) Time: 18:01:54
Change-Id: Id148ccb7a18a05865b903307358666ff6c7b4a3d
Signed-off-by: Martin Roth <martinroth at chromium.org>
Original-Commit-Id: 3b02dbcd7d9023ce0acabebcf904e70007428d27
Original-Change-Id: I344c385e2e4cb995d3a374025c205f01c38b660d
Original-Signed-off-by: Simon Glass <sjg at chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/351782
Original-Commit-Ready: Vadim Bendebury <vbendeb at chromium.org>
Original-Tested-by: Vadim Bendebury <vbendeb at chromium.org>
Original-Reviewed-by: Vadim Bendebury <vbendeb at chromium.org>
---
src/commonlib/Makefile.inc | 2 +
src/commonlib/rtc.c | 154 +++++++++++++++++++++++++++++++++++++++++++++
src/include/rtc.h | 6 ++
3 files changed, 162 insertions(+)
diff --git a/src/commonlib/Makefile.inc b/src/commonlib/Makefile.inc
index be22e00..ad55794 100644
--- a/src/commonlib/Makefile.inc
+++ b/src/commonlib/Makefile.inc
@@ -25,3 +25,5 @@ verstage-y += lz4_wrapper.c
romstage-y += lz4_wrapper.c
ramstage-y += lz4_wrapper.c
postcar-y += lz4_wrapper.c
+
+ramstage-y += rtc.c
diff --git a/src/commonlib/rtc.c b/src/commonlib/rtc.c
new file mode 100644
index 0000000..bd98590
--- /dev/null
+++ b/src/commonlib/rtc.c
@@ -0,0 +1,154 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * (C) Copyright 2001 Wolfgang Denk, DENX Software Engineering, wd at denx.de.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * From U-Boot 2016.05
+ */
+
+#include <console/console.h>
+#include <rtc.h>
+
+#define FEBRUARY 2
+#define STARTOFTIME 1970
+#define SECDAY 86400L
+#define SECYR (SECDAY * 365)
+#define LEAP_YEAR(year) ((year) % 4 == 0)
+#define DAYS_IN_YEAR(a) (LEAP_YEAR(a) ? 366 : 365)
+#define DAYS_IN_MONTH(a) (month_days[(a) - 1])
+
+static const int month_offset[] = {
+ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
+};
+
+static const char * const weekdays[] = {
+ "Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
+};
+
+static int leaps_to_year(int year)
+{
+ return year / 4 - year / 100 + year / 400;
+}
+
+/* This only works for the Gregorian calendar after Jan 1 1971. */
+static int rtc_calc_weekday(struct rtc_time *tm)
+{
+ int leaps_to_date;
+ int day;
+
+ if (tm->year < 1971)
+ return -1;
+
+ day = 4; /* Jan 1 1970 was a Thursday. */
+
+ /* Number of leap corrections to apply up to end of last year */
+ leaps_to_date = leaps_to_year(tm->year - 1) - leaps_to_year(1970);
+
+ /*
+ * This year is a leap year if it is divisible by 4 except when it is
+ * divisible by 100 unless it is divisible by 400
+ *
+ * e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 is.
+ */
+ if ((tm->year % 4) &&
+ ((tm->year % 100 != 0) || (tm->year % 400 == 0)) &&
+ (tm->mon > 2)) {
+ /* We are past Feb. 29 in a leap year */
+ day++;
+ }
+
+ day += (tm->year - 1970) * 365 + leaps_to_date +
+ month_offset[tm->mon-1] + tm->mday;
+ tm->wday = day % 7;
+
+ return 0;
+}
+
+int rtc_to_tm(int tim, struct rtc_time *tm)
+{
+ int month_days[12] = {
+ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+ };
+ register int i;
+ register long hms, day;
+
+ day = tim / SECDAY;
+ hms = tim % SECDAY;
+
+ /* Hours, minutes, seconds are easy */
+ tm->hour = hms / 3600;
+ tm->min = (hms % 3600) / 60;
+ tm->sec = (hms % 3600) % 60;
+
+ /* Number of years in days */
+ for (i = STARTOFTIME; day >= DAYS_IN_YEAR(i); i++)
+ day -= DAYS_IN_YEAR(i);
+ tm->year = i;
+
+ /* Number of months in days left */
+ if (LEAP_YEAR(tm->year))
+ DAYS_IN_MONTH(FEBRUARY) = 29;
+ for (i = 1; day >= DAYS_IN_MONTH(i); i++)
+ day -= DAYS_IN_MONTH(i);
+ DAYS_IN_MONTH(FEBRUARY) = 28;
+ tm->mon = i;
+
+ /* Days are what is left over (+1) from all that */
+ tm->mday = day + 1;
+
+ /* Determine the day of week */
+ return rtc_calc_weekday(tm);
+}
+
+/*
+ * Converts Gregorian date to seconds since 1970-01-01 00:00:00.
+ * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
+ * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
+ *
+ * [For the Julian calendar (which was used in Russia before 1917,
+ * Britain & colonies before 1752, anywhere else before 1582,
+ * and is still in use by some communities) leave out the
+ * -year / 100 + year / 400 terms, and add 10.]
+ *
+ * This algorithm was first published by Gauss (I think).
+ *
+ * WARNING: this function will overflow on 2106-02-07 06:28:16 on
+ * machines where long is 32-bit! (However, as time_t is signed, we
+ * will already get problems at other places on 2038-01-19 03:14:08)
+ */
+unsigned long rtc_mktime(const struct rtc_time *tm)
+{
+ int mon = tm->mon;
+ int year = tm->year;
+ int days, hours;
+
+ mon -= 2;
+ if (0 >= (int)mon) { /* 1..12 -> 11, 12, 1..10 */
+ mon += 12; /* Puts Feb last since it has leap day */
+ year -= 1;
+ }
+
+ days = (unsigned long)(year / 4 - year / 100 + year / 400 +
+ 367 * mon / 12 + tm->mday) +
+ year * 365 - 719499;
+ hours = days * 24 + tm->hour;
+ return (hours * 60 + tm->min) * 60 + tm->sec;
+}
+
+void rtc_display(const struct rtc_time *tm)
+{
+ printk(BIOS_INFO, "Date: %4d-%02d-%02d (%sday) Time: %2d:%02d:%02d\n",
+ tm->year, tm->mon, tm->mday,
+ (tm->wday < 0 || tm->wday > 6) ? "unknown " : weekdays[tm->wday],
+ tm->hour, tm->min, tm->sec);
+}
diff --git a/src/include/rtc.h b/src/include/rtc.h
index 53e03c1..e654785 100644
--- a/src/include/rtc.h
+++ b/src/include/rtc.h
@@ -27,7 +27,13 @@ struct rtc_time
int wday;
};
+/* Implemented by the RTC driver (there can be only one) */
int rtc_set(const struct rtc_time *time);
int rtc_get(struct rtc_time *time);
+/* Common functions */
+int rtc_to_tm(int tim, struct rtc_time *tm);
+unsigned long rtc_mktime(const struct rtc_time *tm);
+void rtc_display(const struct rtc_time *tm);
+
#endif /* _RTC_H_ */
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