drivers/rtc/mc13783-rtc.c

   1 /*
   2  * Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #include <common.h>
  24 #include <rtc.h>
  25 #include <spi.h>
  26 #include <fsl_pmic.h>
  27
  28 int rtc_get(struct rtc_time *rtc)
  29 {
  30         u32 day1, day2, time;
  31         int tim, i = 0;
  32
  33         do {
  34                 day1 = pmic_reg_read(REG_RTC_DAY);
  35                 if (day1 < 0)
  36                         return -1;
  37
  38                 time = pmic_reg_read(REG_RTC_TIME);
  39                 if (time < 0)
  40                         return -1;
  41
  42                 day2 = pmic_reg_read(REG_RTC_DAY);
  43                 if (day2 < 0)
  44                         return -1;
  45
  46         } while (day1 != day2 && i++ < 3);
  47
  48         tim = day1 * 86400 + time;
  49
  50         to_tm(tim, rtc);
  51
  52         rtc->tm_yday = 0;
  53         rtc->tm_isdst = 0;
  54
  55         return 0;
  56 }
  57
  58 int rtc_set(struct rtc_time *rtc)
  59 {
  60         u32 time, day;
  61
  62         time = mktime(rtc->tm_year, rtc->tm_mon, rtc->tm_mday,
  63                       rtc->tm_hour, rtc->tm_min, rtc->tm_sec);
  64         day = time / 86400;
  65         time %= 86400;
  66
  67         pmic_reg_write(REG_RTC_DAY, day);
  68         pmic_reg_write(REG_RTC_TIME, time);
  69
  70         return 0;
  71 }
  72
  73 void rtc_reset(void)
  74 {
  75 }