firmware/drivers/rtc/rtc_imx233.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2011 by Amaury Pouly
  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
  22 #include "config.h"
  23 #include "time.h"
  24 #include "system.h"
  25 #include "rtc.h"
  26 #include "timefuncs.h"
  27 #include "rtc-imx233.h"
  28
  29 #define YEAR1980    315532800   /* 1980/1/1 00:00:00 in UTC */
  30
  31 void rtc_init(void)
  32 {
  33     /* rtc-imx233 is initialized by the system */
  34 }
  35
  36 int rtc_read_datetime(struct tm *tm)
  37 {
  38     uint32_t seconds = imx233_rtc_read_seconds();
  39 #if defined(SANSA_FUZEPLUS) || defined(CREATIVE_ZENXFI3)
  40     /* The OF uses PERSISTENT2 register to keep the adjustment and only changes
  41      * SECONDS if necessary. */
  42     seconds += imx233_rtc_read_persistent(2);
  43 #else
  44     /* The Freescale recommended way of keeping time is the number of seconds
  45      * since 00:00 1/1/1980 */
  46     seconds += YEAR1980;
  47 #endif
  48
  49     gmtime_r(&seconds, tm);
  50
  51     return 0;
  52 }
  53
  54 int rtc_write_datetime(const struct tm *tm)
  55 {
  56     uint32_t seconds;
  57
  58     seconds = mktime((struct tm *)tm);
  59
  60 #if defined(SANSA_FUZEPLUS) || defined(CREATIVE_ZENXFI3)
  61     /* The OF uses PERSISTENT2 register to keep the adjustment and only changes
  62      * SECONDS if necessary.
  63      * NOTE: the OF uses this mechanism to prevent roll back in time. Although
  64      *       Rockbox will handle a negative PERSISTENT2 value, the OF will detect
  65      *       it and won't return in time before SECONDS */
  66     imx233_rtc_write_persistent(2, seconds - imx233_rtc_read_seconds());
  67 #else
  68     /* The Freescale recommended way of keeping time is the number of seconds
  69      * since 00:00 1/1/1980 */
  70     imx233_rtc_write_seconds(seconds - YEAR1980);
  71 #endif
  72
  73     return 0;
  74 }
  75
  76 void rtc_set_alarm(int h, int m)
  77 {
  78     (void) h;
  79     (void) m;
  80 }
  81
  82 void rtc_get_alarm(int *h, int *m)
  83 {
  84     (void) h;
  85     (void) m;
  86 }
  87
  88 void rtc_enable_alarm(bool enable)
  89 {
  90     (void) enable;
  91 }
  92
  93 bool rtc_check_alarm_started(bool release_alarm)
  94 {
  95     (void) release_alarm;
  96     return false;
  97 }
  98
  99 bool rtc_check_alarm_flag(void)
 100 {
 101     return false;
 102 }