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https://github.com/AsahiLinux/u-boot
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b73a19e160
Modify the RTC API to provide one a status for the time reported by
the rtc_get() function:
0 - a reliable time is guaranteed,
< 0 - a reliable time isn't guaranteed (power fault, clock issues,
and so on).
The RTC chip drivers are responsible for providing this info if the
corresponding chip supports such functionality. If not - always
report that the time is reliable.
The POST RTC test was modified to detect the RTC faults utilizing
this new rtc_get() feature.
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
123 lines
3 KiB
C
123 lines
3 KiB
C
/*
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* Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
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* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#if defined(CONFIG_MCFRTC) && defined(CONFIG_CMD_DATE)
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#include <command.h>
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#include <rtc.h>
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#include <asm/immap.h>
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#include <asm/rtc.h>
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#undef RTC_DEBUG
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#ifndef CFG_MCFRTC_BASE
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#error RTC_BASE is not defined!
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#endif
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#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
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#define STARTOFTIME 1970
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int rtc_get(struct rtc_time *tmp)
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{
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volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
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int rtc_days, rtc_hrs, rtc_mins;
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int tim;
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rtc_days = rtc->days;
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rtc_hrs = rtc->hourmin >> 8;
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rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
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tim = (rtc_days * 24) + rtc_hrs;
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tim = (tim * 60) + rtc_mins;
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tim = (tim * 60) + rtc->seconds;
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to_tm(tim, tmp);
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tmp->tm_yday = 0;
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tmp->tm_isdst = 0;
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#ifdef RTC_DEBUG
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printf("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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#endif
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return 0;
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}
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void rtc_set(struct rtc_time *tmp)
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{
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volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
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static 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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int days, i, months;
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if (tmp->tm_year > 2037) {
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printf("Unable to handle. Exceeding integer limitation!\n");
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tmp->tm_year = 2027;
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}
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#ifdef RTC_DEBUG
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printf("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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#endif
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/* calculate days by years */
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for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
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days += 365 + isleap(i);
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}
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/* calculate days by months */
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months = tmp->tm_mon - 1;
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for (i = 0; i < months; i++) {
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days += month_days[i];
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if (i == 1)
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days += isleap(i);
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}
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days += tmp->tm_mday - 1;
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rtc->days = days;
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rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
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rtc->seconds = tmp->tm_sec;
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}
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void rtc_reset(void)
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{
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volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
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if ((rtc->cr & RTC_CR_EN) == 0) {
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printf("real-time-clock was stopped. Now starting...\n");
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rtc->cr |= RTC_CR_EN;
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}
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rtc->cr |= RTC_CR_SWR;
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}
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#endif /* CONFIG_MCFRTC && CONFIG_CMD_DATE */
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