lib: 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@chromium.org> Original-Commit-Id: 3b02dbcd7d9023ce0acabebcf904e70007428d27 Original-Change-Id: I344c385e2e4cb995d3a374025c205f01c38b660d Original-Signed-off-by: Simon Glass <sjg@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/351782 Original-Commit-Ready: Vadim Bendebury <vbendeb@chromium.org> Original-Tested-by: Vadim Bendebury <vbendeb@chromium.org> Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://review.coreboot.org/15301 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
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@ -27,7 +27,13 @@ struct rtc_time
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int wday;
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};
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/* Implemented by the RTC driver (there can be only one) */
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int rtc_set(const struct rtc_time *time);
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int rtc_get(struct rtc_time *time);
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/* Common functions */
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int rtc_to_tm(int tim, struct rtc_time *tm);
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unsigned long rtc_mktime(const struct rtc_time *tm);
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void rtc_display(const struct rtc_time *tm);
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#endif /* _RTC_H_ */
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@ -79,6 +79,7 @@ ramstage-$(CONFIG_PRIMITIVE_MEMTEST) += primitive_memtest.c
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romstage-$(CONFIG_CACHE_AS_RAM) += ramtest.c
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romstage-$(CONFIG_GENERIC_GPIO_LIB) += gpio.c
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romstage-y += stack.c
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ramstage-y += rtc.c
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ifeq ($(CONFIG_EARLY_CBMEM_INIT),y)
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romstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
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@ -0,0 +1,154 @@
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/*
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* This file is part of the coreboot project.
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*
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* (C) Copyright 2001 Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* From U-Boot 2016.05
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*/
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#include <console/console.h>
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#include <rtc.h>
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#define FEBRUARY 2
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#define STARTOFTIME 1970
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#define SECDAY 86400L
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#define SECYR (SECDAY * 365)
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#define LEAP_YEAR(year) ((year) % 4 == 0)
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#define DAYS_IN_YEAR(a) (LEAP_YEAR(a) ? 366 : 365)
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#define DAYS_IN_MONTH(a) (month_days[(a) - 1])
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static const int month_offset[] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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static const char * const weekdays[] = {
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"Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
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};
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static int leaps_to_year(int year)
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{
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return year / 4 - year / 100 + year / 400;
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}
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/* This only works for the Gregorian calendar after Jan 1 1971. */
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static int rtc_calc_weekday(struct rtc_time *tm)
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{
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int leaps_to_date;
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int day;
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if (tm->year < 1971)
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return -1;
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day = 4; /* Jan 1 1970 was a Thursday. */
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/* Number of leap corrections to apply up to end of last year */
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leaps_to_date = leaps_to_year(tm->year - 1) - leaps_to_year(1970);
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/*
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* This year is a leap year if it is divisible by 4 except when it is
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* divisible by 100 unless it is divisible by 400
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*
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* e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 is.
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*/
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if ((tm->year % 4) &&
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((tm->year % 100 != 0) || (tm->year % 400 == 0)) &&
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(tm->mon > 2)) {
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/* We are past Feb. 29 in a leap year */
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day++;
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}
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day += (tm->year - 1970) * 365 + leaps_to_date +
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month_offset[tm->mon-1] + tm->mday;
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tm->wday = day % 7;
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return 0;
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}
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int rtc_to_tm(int tim, struct rtc_time *tm)
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{
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int month_days[12] = {
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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register int i;
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register long hms, day;
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day = tim / SECDAY;
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hms = tim % SECDAY;
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/* Hours, minutes, seconds are easy */
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tm->hour = hms / 3600;
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tm->min = (hms % 3600) / 60;
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tm->sec = (hms % 3600) % 60;
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/* Number of years in days */
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for (i = STARTOFTIME; day >= DAYS_IN_YEAR(i); i++)
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day -= DAYS_IN_YEAR(i);
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tm->year = i;
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/* Number of months in days left */
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if (LEAP_YEAR(tm->year))
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DAYS_IN_MONTH(FEBRUARY) = 29;
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for (i = 1; day >= DAYS_IN_MONTH(i); i++)
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day -= DAYS_IN_MONTH(i);
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DAYS_IN_MONTH(FEBRUARY) = 28;
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tm->mon = i;
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/* Days are what is left over (+1) from all that */
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tm->mday = day + 1;
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/* Determine the day of week */
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return rtc_calc_weekday(tm);
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}
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/*
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* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
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* Assumes input in normal date format, i.e. 1980-12-31 23:59:59
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* => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
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*
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* [For the Julian calendar (which was used in Russia before 1917,
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* Britain & colonies before 1752, anywhere else before 1582,
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* and is still in use by some communities) leave out the
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* -year / 100 + year / 400 terms, and add 10.]
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*
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* This algorithm was first published by Gauss (I think).
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*
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* WARNING: this function will overflow on 2106-02-07 06:28:16 on
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* machines where long is 32-bit! (However, as time_t is signed, we
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* will already get problems at other places on 2038-01-19 03:14:08)
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*/
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unsigned long rtc_mktime(const struct rtc_time *tm)
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{
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int mon = tm->mon;
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int year = tm->year;
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int days, hours;
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mon -= 2;
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if (0 >= (int)mon) { /* 1..12 -> 11, 12, 1..10 */
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mon += 12; /* Puts Feb last since it has leap day */
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year -= 1;
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}
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days = (unsigned long)(year / 4 - year / 100 + year / 400 +
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367 * mon / 12 + tm->mday) +
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year * 365 - 719499;
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hours = days * 24 + tm->hour;
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return (hours * 60 + tm->min) * 60 + tm->sec;
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}
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void rtc_display(const struct rtc_time *tm)
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{
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printk(BIOS_INFO, "Date: %4d-%02d-%02d (%sday) Time: %2d:%02d:%02d\n",
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tm->year, tm->mon, tm->mday,
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(tm->wday < 0 || tm->wday > 6) ? "unknown " : weekdays[tm->wday],
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tm->hour, tm->min, tm->sec);
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}
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