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125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/*
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* (C) Copyright 2010
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* Heiko Schocher, DENX Software Engineering, hs@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 <common.h>
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#include <command.h>
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#include <i2c.h>
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#include <rtc.h>
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#define RTC_RV3029_CTRL_RESET 0x04
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#define RTC_RV3029_CTRL_SYS_R (1 << 4)
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#define RTC_RV3029_CLOCK_PAGE 0x08
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#define RTC_RV3029_PAGE_LEN 7
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#define RV3029C2_W_SECONDS 0x00
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#define RV3029C2_W_MINUTES 0x01
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#define RV3029C2_W_HOURS 0x02
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#define RV3029C2_W_DATE 0x03
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#define RV3029C2_W_DAYS 0x04
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#define RV3029C2_W_MONTHS 0x05
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#define RV3029C2_W_YEARS 0x06
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#define RV3029C2_REG_HR_12_24 (1 << 6) /* 24h/12h mode */
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#define RV3029C2_REG_HR_PM (1 << 5) /* PM/AM bit in 12h mode */
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int rtc_get( struct rtc_time *tmp )
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{
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int ret;
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unsigned char buf[RTC_RV3029_PAGE_LEN];
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ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, buf, \
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RTC_RV3029_PAGE_LEN);
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if (ret) {
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printf("%s: error reading RTC: %x\n", __func__, ret);
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return -1;
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}
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tmp->tm_sec = bcd2bin( buf[RV3029C2_W_SECONDS] & 0x7f);
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tmp->tm_min = bcd2bin( buf[RV3029C2_W_MINUTES] & 0x7f);
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if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_12_24) {
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/* 12h format */
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tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x1f);
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if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_PM)
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/* PM flag set */
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tmp->tm_hour += 12;
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} else
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tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x3f);
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tmp->tm_mday = bcd2bin( buf[RV3029C2_W_DATE] & 0x3F );
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tmp->tm_mon = bcd2bin( buf[RV3029C2_W_MONTHS] & 0x1F );
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tmp->tm_wday = bcd2bin( buf[RV3029C2_W_DAYS] & 0x07 );
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/* RTC supports only years > 1999 */
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tmp->tm_year = bcd2bin( buf[RV3029C2_W_YEARS]) + 2000;
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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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int rtc_set( struct rtc_time *tmp )
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{
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int ret;
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unsigned char buf[RTC_RV3029_PAGE_LEN];
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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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if (tmp->tm_year < 2000) {
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printf("RTC: year %d < 2000 not possible\n", tmp->tm_year);
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return -1;
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}
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buf[RV3029C2_W_SECONDS] = bin2bcd(tmp->tm_sec);
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buf[RV3029C2_W_MINUTES] = bin2bcd(tmp->tm_min);
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buf[RV3029C2_W_HOURS] = bin2bcd(tmp->tm_hour);
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/* set 24h format */
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buf[RV3029C2_W_HOURS] &= ~RV3029C2_REG_HR_12_24;
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buf[RV3029C2_W_DATE] = bin2bcd(tmp->tm_mday);
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buf[RV3029C2_W_DAYS] = bin2bcd(tmp->tm_wday);
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buf[RV3029C2_W_MONTHS] = bin2bcd(tmp->tm_mon);
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tmp->tm_year -= 2000;
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buf[RV3029C2_W_YEARS] = bin2bcd(tmp->tm_year);
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ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1,
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buf, RTC_RV3029_PAGE_LEN);
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/* give the RTC some time to update */
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udelay(1000);
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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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int ret;
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unsigned char buf[RTC_RV3029_PAGE_LEN];
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buf[0] = RTC_RV3029_CTRL_SYS_R;
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ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_RESET, 1,
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buf, 1);
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}
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