firmware/drivers/rtc/rtc_s3c2440.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing, Uwe Freese, Laurent Baum
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include "config.h"
  22 #include "i2c.h"
  23 #include "rtc.h"
  24 #include "kernel.h"
  25 #include "system.h"
  26
  27 void rtc_init(void)
  28 {
  29     /* RTC Enable */
  30     RTCCON |= 1;
  31 }
  32
  33 int rtc_read_datetime(struct tm *tm)
  34 {
  35     tm->tm_sec = BCD2DEC(BCDSEC);
  36     tm->tm_min = BCD2DEC(BCDMIN);
  37     tm->tm_hour = BCD2DEC(BCDHOUR);
  38     tm->tm_wday = BCD2DEC(BCDDAY) - 1; /* timefuncs wants 0..6 for wday */
  39     tm->tm_mday = BCD2DEC(BCDDATE);
  40     tm->tm_mon = BCD2DEC(BCDMON) - 1;
  41     tm->tm_year = BCD2DEC(BCDYEAR) + 100;
  42
  43     return 1;
  44 }
  45
  46 int rtc_write_datetime(const struct tm *tm)
  47 {
  48     BCDSEC  = DEC2BCD(tm->tm_sec);
  49     BCDMIN  = DEC2BCD(tm->tm_min);
  50     BCDHOUR = DEC2BCD(tm->tm_hour);
  51     BCDDAY  = DEC2BCD(tm->tm_wday) + 1; /* chip wants 1..7 for wday */
  52     BCDDATE = DEC2BCD(tm->tm_mday);
  53     BCDMON  = DEC2BCD(tm->tm_mon + 1);
  54     BCDYEAR = DEC2BCD(tm->tm_year - 100);
  55
  56     return 1;
  57 }
  58
  59 #ifdef HAVE_RTC_ALARM
  60 /* This alarm code works with a flashed bootloader.  This will not work with
  61  * the OF bootloader.
  62  */
  63
  64 /* Check whether the unit has been started by the RTC alarm function */
  65 bool rtc_check_alarm_started(bool release_alarm)
  66 {
  67     if (GSTATUS3)
  68     {
  69         GSTATUS3 &= ~release_alarm;
  70         return true;
  71     }
  72     else
  73     {
  74         return false;
  75     }
  76 }
  77
  78 /* Check to see if the alarm has flaged since the last it was checked */
  79 bool rtc_check_alarm_flag(void)
  80 {
  81     bool ret=SRCPND & 0x40000000;
  82
  83     SRCPND=RTC_MASK;
  84
  85     return ret;
  86 }
  87
  88 /* set alarm time registers to the given time (repeat once per day) */
  89 void rtc_set_alarm(int h, int m)
  90 {
  91     ALMMIN = DEC2BCD(m); /* minutes */
  92     ALMHOUR = DEC2BCD(h); /* hour */
  93 }
  94
  95 /* read out the current alarm time */
  96 void rtc_get_alarm(int *h, int *m)
  97 {
  98     *m = BCD2DEC(ALMMIN);
  99     *h = BCD2DEC(ALMHOUR);
 100 }
 101
 102 /* turn alarm on or off by setting the alarm flag enable
 103  * returns false if alarm was set and alarm flag (output) is off
 104  */
 105 bool rtc_enable_alarm(bool enable)
 106 {
 107     if (enable)
 108     {
 109         RTCALM=0x46;
 110     }
 111     else
 112     {
 113         RTCALM=0x00;
 114     }
 115
 116     return false; /* all ok */
 117 }
 118 #endif