drivers/rtc/mcfrtc.c

   1 /*
   2  * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
   3  * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9
  10 #if defined(CONFIG_CMD_DATE)
  11
  12 #include <command.h>
  13 #include <rtc.h>
  14 #include <asm/immap.h>
  15 #include <asm/rtc.h>
  16
  17 #undef RTC_DEBUG
  18
  19 #ifndef CONFIG_SYS_MCFRTC_BASE
  20 #error RTC_BASE is not defined!
  21 #endif
  22
  23 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  24 #define STARTOFTIME             1970
  25
  26 int rtc_get(struct rtc_time *tmp)
  27 {
  28         volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
  29
  30         int rtc_days, rtc_hrs, rtc_mins;
  31         int tim;
  32
  33         rtc_days = rtc->days;
  34         rtc_hrs = rtc->hourmin >> 8;
  35         rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
  36
  37         tim = (rtc_days * 24) + rtc_hrs;
  38         tim = (tim * 60) + rtc_mins;
  39         tim = (tim * 60) + rtc->seconds;
  40
  41         rtc_to_tm(tim, tmp);
  42
  43         tmp->tm_yday = 0;
  44         tmp->tm_isdst = 0;
  45
  46 #ifdef RTC_DEBUG
  47         printf("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  48                tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  49                tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  50 #endif
  51
  52         return 0;
  53 }
  54
  55 int rtc_set(struct rtc_time *tmp)
  56 {
  57         volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
  58
  59         static int month_days[12] = {
  60                 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
  61         };
  62         int days, i, months;
  63
  64         if (tmp->tm_year > 2037) {
  65                 printf("Unable to handle. Exceeding integer limitation!\n");
  66                 tmp->tm_year = 2027;
  67         }
  68 #ifdef RTC_DEBUG
  69         printf("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  70                tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  71                tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  72 #endif
  73
  74         /* calculate days by years */
  75         for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
  76                 days += 365 + isleap(i);
  77         }
  78
  79         /* calculate days by months */
  80         months = tmp->tm_mon - 1;
  81         for (i = 0; i < months; i++) {
  82                 days += month_days[i];
  83
  84                 if (i == 1)
  85                         days += isleap(i);
  86         }
  87
  88         days += tmp->tm_mday - 1;
  89
  90         rtc->days = days;
  91         rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
  92         rtc->seconds = tmp->tm_sec;
  93
  94         return 0;
  95 }
  96
  97 void rtc_reset(void)
  98 {
  99         volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);
 100
 101         if ((rtc->cr & RTC_CR_EN) == 0) {
 102                 printf("real-time-clock was stopped. Now starting...\n");
 103                 rtc->cr |= RTC_CR_EN;
 104         }
 105
 106         rtc->cr |= RTC_CR_SWR;
 107 }
 108
 109 #endif                          /* CONFIG_MCFRTC && CONFIG_CMD_DATE */