118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
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/*
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* (C) Copyright 2008, 2009
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* Andreas Pfefferle, DENX Software Engineering, ap@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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#include <asm/io.h>
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#include <common.h>
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#include <command.h>
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#include <config.h>
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#include <rtc.h>
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#include <tws.h>
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#if defined(CONFIG_CMD_DATE)
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/*
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* Note: The acrobatics below is due to the hideously ingenius idea of
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* the chip designers. As the chip does not allow register
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* addressing, all values need to be read and written in one go. Sure
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* enough, the 'wday' field (0-6) is transferred using the economic
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* number of 4 bits right in the middle of the packet.....
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*/
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int rtc_get(struct rtc_time *tm)
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{
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int rel = 0;
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uchar buffer[7];
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memset(buffer, 0, 7);
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/* Read 52 bits into our buffer */
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tws_read(buffer, 52);
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tm->tm_sec = bcd2bin( buffer[0] & 0x7F);
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tm->tm_min = bcd2bin( buffer[1] & 0x7F);
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tm->tm_hour = bcd2bin( buffer[2] & 0x3F);
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tm->tm_wday = bcd2bin( buffer[3] & 0x07);
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tm->tm_mday = bcd2bin((buffer[3] & 0xF0) >> 4 | (buffer[4] & 0x0F) << 4);
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tm->tm_mon = bcd2bin((buffer[4] & 0x30) >> 4 | (buffer[5] & 0x0F) << 4);
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tm->tm_year = bcd2bin((buffer[5] & 0xF0) >> 4 | (buffer[6] & 0x0F) << 4) + 2000;
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tm->tm_yday = 0;
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tm->tm_isdst = 0;
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if (tm->tm_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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debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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return rel;
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}
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int rtc_set(struct rtc_time *tm)
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{
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uchar buffer[7];
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uchar tmp;
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debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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memset(buffer, 0, 7);
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buffer[0] = bin2bcd(tm->tm_sec);
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buffer[1] = bin2bcd(tm->tm_min);
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buffer[2] = bin2bcd(tm->tm_hour);
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buffer[3] = bin2bcd(tm->tm_wday);
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tmp = bin2bcd(tm->tm_mday);
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buffer[3] |= (tmp & 0x0F) << 4;
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buffer[4] = (tmp & 0xF0) >> 4;
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tmp = bin2bcd(tm->tm_mon);
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buffer[4] |= (tmp & 0x0F) << 4;
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buffer[5] = (tmp & 0xF0) >> 4;
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tmp = bin2bcd(tm->tm_year % 100);
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buffer[5] |= (tmp & 0x0F) << 4;
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buffer[6] = (tmp & 0xF0) >> 4;
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/* Write the resulting 52 bits to device */
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tws_write(buffer, 52);
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return 0;
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}
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void rtc_reset(void)
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{
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struct rtc_time tmp;
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tmp.tm_sec = 0;
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tmp.tm_min = 0;
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tmp.tm_hour = 0;
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tmp.tm_wday = 4;
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tmp.tm_mday = 1;
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tmp.tm_mon = 1;
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tmp.tm_year = 2000;
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rtc_set(&tmp);
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}
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#endif
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