// SPDX-License-Identifier: GPL-2.0+

  /*

   * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
   * TsiChung Liew (Tsi-Chung.Liew@freescale.com)

   */
  
  #include <common.h>

  #include <command.h>
  #include <rtc.h>

  #include <asm/immap.h>
  #include <asm/rtc.h>

  #undef RTC_DEBUG

  #ifndef CONFIG_SYS_MCFRTC_BASE

  #error RTC_BASE is not defined!
  #endif
  
  #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  #define	STARTOFTIME		1970

  int rtc_get(struct rtc_time *tmp)

  {

  	volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);

  
  	int rtc_days, rtc_hrs, rtc_mins;
  	int tim;
  
  	rtc_days = rtc->days;
  	rtc_hrs = rtc->hourmin >> 8;
  	rtc_mins = RTC_HOURMIN_MINUTES(rtc->hourmin);
  
  	tim = (rtc_days * 24) + rtc_hrs;
  	tim = (tim * 60) + rtc_mins;
  	tim = (tim * 60) + rtc->seconds;

  	rtc_to_tm(tim, tmp);

  
  	tmp->tm_yday = 0;
  	tmp->tm_isdst = 0;
  
  #ifdef RTC_DEBUG
  	printf("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d
  ",
  	       tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  	       tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  #endif

  
  	return 0;

  }

  int rtc_set(struct rtc_time *tmp)

  {

  	volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);

  
  	static int month_days[12] = {
  		31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
  	};
  	int days, i, months;
  
  	if (tmp->tm_year > 2037) {
  		printf("Unable to handle. Exceeding integer limitation!
  ");
  		tmp->tm_year = 2027;
  	}
  #ifdef RTC_DEBUG
  	printf("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d
  ",
  	       tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  	       tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  #endif
  
  	/* calculate days by years */
  	for (i = STARTOFTIME, days = 0; i < tmp->tm_year; i++) {
  		days += 365 + isleap(i);
  	}
  
  	/* calculate days by months */
  	months = tmp->tm_mon - 1;
  	for (i = 0; i < months; i++) {
  		days += month_days[i];
  
  		if (i == 1)
  			days += isleap(i);
  	}
  
  	days += tmp->tm_mday - 1;
  
  	rtc->days = days;
  	rtc->hourmin = (tmp->tm_hour << 8) | tmp->tm_min;
  	rtc->seconds = tmp->tm_sec;

  
  	return 0;

  }
  
  void rtc_reset(void)
  {

  	volatile rtc_t *rtc = (rtc_t *) (CONFIG_SYS_MCFRTC_BASE);

  
  	if ((rtc->cr & RTC_CR_EN) == 0) {
  		printf("real-time-clock was stopped. Now starting...
  ");
  		rtc->cr |= RTC_CR_EN;
  	}
  
  	rtc->cr |= RTC_CR_SWR;
  }