drivers/rtc/mcfrtc.c

   1 /*
   2  * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
   3  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25
  26 #if defined(CONFIG_MCFRTC) && defined(CONFIG_CMD_DATE)
  27
  28 #include <command.h>
  29 #include <rtc.h>
  30 #include <asm/immap.h>
  31 #include <asm/rtc.h>
  32
  33 #undef RTC_DEBUG
  34
  35 #ifndef CFG_MCFRTC_BASE
  36 #error RTC_BASE is not defined!
  37 #endif
  38
  39 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  40 #define STARTOFTIME             1970
  41
  42 void rtc_get(struct rtc_time *tmp)
  43 {
  44         volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
  45
  46         int rtc_days, rtc_hrs, rtc_mins;
  47         int tim;
  48
  49         rtc_days = rtc->days;
  50         rtc_hrs = rtc->hourmin >> 8;
  51         rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
  52
  53         tim = (rtc_days * 24) + rtc_hrs;
  54         tim = (tim * 60) + rtc_mins;
  55         tim = (tim * 60) + rtc->seconds;
  56
  57         to_tm(tim, tmp);
  58
  59         tmp->tm_yday = 0;
  60         tmp->tm_isdst = 0;
  61
  62 #ifdef RTC_DEBUG
  63         printf("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  64                tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  65                tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  66 #endif
  67 }
  68
  69 void rtc_set(struct rtc_time *tmp)
  70 {
  71         volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
  72
  73         static int month_days[12] = {
  74                 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
  75         };
  76         int days, i, months;
  77
  78         if (tmp->tm_year > 2037) {
  79                 printf("Unable to handle. Exceeding integer limitation!\n");
  80                 tmp->tm_year = 2027;
  81         }
  82 #ifdef RTC_DEBUG
  83         printf("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  84                tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  85                tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  86 #endif
  87
  88         /* calculate days by years */
  89         for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
  90                 days += 365 + isleap(i);
  91         }
  92
  93         /* calculate days by months */
  94         months = tmp->tm_mon - 1;
  95         for (i = 0; i < months; i++) {
  96                 days += month_days[i];
  97
  98                 if (i == 1)
  99                         days += isleap(i);
 100         }
 101
 102         days += tmp->tm_mday - 1;
 103
 104         rtc->days = days;
 105         rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
 106         rtc->seconds = tmp->tm_sec;
 107 }
 108
 109 void rtc_reset(void)
 110 {
 111         volatile rtc_t *rtc = (rtc_t *) (CFG_MCFRTC_BASE);
 112
 113         if ((rtc->cr & RTC_CR_EN) == 0) {
 114                 printf("real-time-clock was stopped. Now starting...\n");
 115                 rtc->cr |= RTC_CR_EN;
 116         }
 117
 118         rtc->cr |= RTC_CR_SWR;
 119 }
 120
 121 #endif                          /* CONFIG_MCFRTC && CONFIG_CMD_DATE */