LXR uboot/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
  26int 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
  55int 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
  97void 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 */
 110