drivers/rtc/mc13xxx-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 <power/pmic.h>
  27 #include <fsl_pmic.h>
  28
  29 int rtc_get(struct rtc_time *rtc)
  30 {
  31         u32 day1, day2, time;
  32         int tim, i = 0;
  33         struct pmic *p = pmic_get("FSL_PMIC");
  34         int ret;
  35
  36         if (!p)
  37                 return -1;
  38         do {
  39                 ret = pmic_reg_read(p, REG_RTC_DAY, &day1);
  40                 if (ret < 0)
  41                         return -1;
  42
  43                 ret = pmic_reg_read(p, REG_RTC_TIME, &time);
  44                 if (ret < 0)
  45                         return -1;
  46
  47                 ret = pmic_reg_read(p, REG_RTC_DAY, &day2);
  48                 if (ret < 0)
  49                         return -1;
  50
  51         } while (day1 != day2 && i++ < 3);
  52
  53         tim = day1 * 86400 + time;
  54
  55         to_tm(tim, rtc);
  56
  57         rtc->tm_yday = 0;
  58         rtc->tm_isdst = 0;
  59
  60         return 0;
  61 }
  62
  63 int rtc_set(struct rtc_time *rtc)
  64 {
  65         u32 time, day;
  66         struct pmic *p = pmic_get("FSL_PMIC");
  67         if (!p)
  68                 return -1;
  69
  70         time = mktime(rtc->tm_year, rtc->tm_mon, rtc->tm_mday,
  71                       rtc->tm_hour, rtc->tm_min, rtc->tm_sec);
  72         day = time / 86400;
  73         time %= 86400;
  74
  75         pmic_reg_write(p, REG_RTC_DAY, day);
  76         pmic_reg_write(p, REG_RTC_TIME, time);
  77
  78         return 0;
  79 }
  80
  81 void rtc_reset(void)
  82 {
  83 }