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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>
148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/*
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* (C) Copyright 2001
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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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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/*
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* Date & Time support for Philips PCF8563 RTC
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*/
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/* #define DEBUG */
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#include <common.h>
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#include <command.h>
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#include <rtc.h>
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#include <i2c.h>
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#if defined(CONFIG_RTC_PCF8563) && defined(CONFIG_CMD_DATE)
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static uchar rtc_read (uchar reg);
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static void rtc_write (uchar reg, uchar val);
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static uchar bin2bcd (unsigned int n);
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static unsigned bcd2bin(uchar c);
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/* ------------------------------------------------------------------------- */
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int rtc_get (struct rtc_time *tmp)
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{
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int rel = 0;
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uchar sec, min, hour, mday, wday, mon_cent, year;
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sec = rtc_read (0x02);
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min = rtc_read (0x03);
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hour = rtc_read (0x04);
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mday = rtc_read (0x05);
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wday = rtc_read (0x06);
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mon_cent= rtc_read (0x07);
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year = rtc_read (0x08);
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debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
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"hr: %02x min: %02x sec: %02x\n",
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year, mon_cent, mday, wday,
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hour, min, sec );
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debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
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rtc_read (0x0C),
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rtc_read (0x0B),
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rtc_read (0x0A),
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rtc_read (0x09) );
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if (sec & 0x80) {
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puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
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rel = -1;
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}
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tmp->tm_sec = bcd2bin (sec & 0x7F);
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tmp->tm_min = bcd2bin (min & 0x7F);
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tmp->tm_hour = bcd2bin (hour & 0x3F);
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tmp->tm_mday = bcd2bin (mday & 0x3F);
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tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
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tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 2000 : 1900);
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tmp->tm_wday = bcd2bin (wday & 0x07);
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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debug ( "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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return rel;
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}
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void rtc_set (struct rtc_time *tmp)
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{
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uchar century;
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debug ( "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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rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
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century = (tmp->tm_year >= 2000) ? 0x80 : 0;
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rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
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rtc_write (0x06, bin2bcd(tmp->tm_wday));
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rtc_write (0x05, bin2bcd(tmp->tm_mday));
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rtc_write (0x04, bin2bcd(tmp->tm_hour));
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rtc_write (0x03, bin2bcd(tmp->tm_min ));
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rtc_write (0x02, bin2bcd(tmp->tm_sec ));
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}
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void rtc_reset (void)
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{
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/* clear all control & status registers */
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rtc_write (0x00, 0x00);
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rtc_write (0x01, 0x00);
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rtc_write (0x0D, 0x00);
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/* clear Voltage Low bit */
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rtc_write (0x02, rtc_read (0x02) & 0x7F);
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/* reset all alarms */
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rtc_write (0x09, 0x00);
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rtc_write (0x0A, 0x00);
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rtc_write (0x0B, 0x00);
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rtc_write (0x0C, 0x00);
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}
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/* ------------------------------------------------------------------------- */
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static uchar rtc_read (uchar reg)
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{
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return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg));
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}
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static void rtc_write (uchar reg, uchar val)
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{
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i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val);
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}
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static unsigned bcd2bin (uchar n)
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{
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return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
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}
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static unsigned char bin2bcd (unsigned int n)
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{
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return (((n / 10) << 4) | (n % 10));
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}
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#endif
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