drivers/rtc/s3c44b0_rtc.c

   1 /*
   2  * (C) Copyright 2004
   3  * DAVE Srl
   4  * http://www.dave-tech.it
   5  * http://www.wawnet.biz
   6  * mailto:info@wawnet.biz
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 /*
  28  * S3C44B0 CPU specific code
  29  */
  30
  31 #include <common.h>
  32 #include <command.h>
  33 #include <asm/hardware.h>
  34 #include <rtc.h>
  35
  36 int rtc_get (struct rtc_time* tm)
  37 {
  38         RTCCON |= 1;
  39         tm->tm_year  = bcd2bin(BCDYEAR);
  40         tm->tm_mon   = bcd2bin(BCDMON);
  41         tm->tm_wday   = bcd2bin(BCDDATE);
  42         tm->tm_mday   = bcd2bin(BCDDAY);
  43         tm->tm_hour  = bcd2bin(BCDHOUR);
  44         tm->tm_min  = bcd2bin(BCDMIN);
  45         tm->tm_sec  = bcd2bin(BCDSEC);
  46
  47         if (tm->tm_sec==0) {
  48                 /* we have to re-read the rtc data because of the "one second deviation" problem */
  49                 /* see RTC datasheet for more info about it */
  50                 tm->tm_year  = bcd2bin(BCDYEAR);
  51                 tm->tm_mon   = bcd2bin(BCDMON);
  52                 tm->tm_mday   = bcd2bin(BCDDAY);
  53                 tm->tm_wday   = bcd2bin(BCDDATE);
  54                 tm->tm_hour  = bcd2bin(BCDHOUR);
  55                 tm->tm_min  = bcd2bin(BCDMIN);
  56                 tm->tm_sec  = bcd2bin(BCDSEC);
  57         }
  58
  59         RTCCON &= ~1;
  60
  61         if(tm->tm_year >= 70)
  62                 tm->tm_year += 1900;
  63         else
  64                 tm->tm_year += 2000;
  65
  66         return 0;
  67 }
  68
  69 int rtc_set (struct rtc_time* tm)
  70 {
  71         if(tm->tm_year < 2000)
  72                 tm->tm_year -= 1900;
  73         else
  74                 tm->tm_year -= 2000;
  75
  76         RTCCON |= 1;
  77         BCDYEAR = bin2bcd(tm->tm_year);
  78         BCDMON = bin2bcd(tm->tm_mon);
  79         BCDDAY = bin2bcd(tm->tm_mday);
  80         BCDDATE = bin2bcd(tm->tm_wday);
  81         BCDHOUR = bin2bcd(tm->tm_hour);
  82         BCDMIN = bin2bcd(tm->tm_min);
  83         BCDSEC = bin2bcd(tm->tm_sec);
  84         RTCCON &= 1;
  85
  86         return 0;
  87 }
  88
  89 void rtc_reset (void)
  90 {
  91         RTCCON |= 1;
  92         BCDYEAR = 0;
  93         BCDMON = 0;
  94         BCDDAY = 0;
  95         BCDDATE = 0;
  96         BCDHOUR = 0;
  97         BCDMIN = 0;
  98         BCDSEC = 0;
  99         RTCCON &= 1;
 100 }