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  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 /*
  12  * S3C44B0 CPU specific code
  13  */
  14
  15 #include <common.h>
  16 #include <command.h>
  17 #include <asm/hardware.h>
  18 #include <rtc.h>
  19
  20 int rtc_get (struct rtc_time* tm)
  21 {
  22         RTCCON |= 1;
  23         tm->tm_year  = bcd2bin(BCDYEAR);
  24         tm->tm_mon   = bcd2bin(BCDMON);
  25         tm->tm_wday   = bcd2bin(BCDDATE);
  26         tm->tm_mday   = bcd2bin(BCDDAY);
  27         tm->tm_hour  = bcd2bin(BCDHOUR);
  28         tm->tm_min  = bcd2bin(BCDMIN);
  29         tm->tm_sec  = bcd2bin(BCDSEC);
  30
  31         if (tm->tm_sec==0) {
  32                 /* we have to re-read the rtc data because of the "one second deviation" problem */
  33                 /* see RTC datasheet for more info about it */
  34                 tm->tm_year  = bcd2bin(BCDYEAR);
  35                 tm->tm_mon   = bcd2bin(BCDMON);
  36                 tm->tm_mday   = bcd2bin(BCDDAY);
  37                 tm->tm_wday   = bcd2bin(BCDDATE);
  38                 tm->tm_hour  = bcd2bin(BCDHOUR);
  39                 tm->tm_min  = bcd2bin(BCDMIN);
  40                 tm->tm_sec  = bcd2bin(BCDSEC);
  41         }
  42
  43         RTCCON &= ~1;
  44
  45         if(tm->tm_year >= 70)
  46                 tm->tm_year += 1900;
  47         else
  48                 tm->tm_year += 2000;
  49
  50         return 0;
  51 }
  52
  53 int rtc_set (struct rtc_time* tm)
  54 {
  55         if(tm->tm_year < 2000)
  56                 tm->tm_year -= 1900;
  57         else
  58                 tm->tm_year -= 2000;
  59
  60         RTCCON |= 1;
  61         BCDYEAR = bin2bcd(tm->tm_year);
  62         BCDMON = bin2bcd(tm->tm_mon);
  63         BCDDAY = bin2bcd(tm->tm_mday);
  64         BCDDATE = bin2bcd(tm->tm_wday);
  65         BCDHOUR = bin2bcd(tm->tm_hour);
  66         BCDMIN = bin2bcd(tm->tm_min);
  67         BCDSEC = bin2bcd(tm->tm_sec);
  68         RTCCON &= 1;
  69
  70         return 0;
  71 }
  72
  73 void rtc_reset (void)
  74 {
  75         RTCCON |= 1;
  76         BCDYEAR = 0;
  77         BCDMON = 0;
  78         BCDDAY = 0;
  79         BCDDATE = 0;
  80         BCDHOUR = 0;
  81         BCDMIN = 0;
  82         BCDSEC = 0;
  83         RTCCON &= 1;
  84 }