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bootloader/u-boot_2015_04/drivers/rtc/mpc5xxx.c 3.76 KB
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  /*
   * (C) Copyright 2004
   * Reinhard Meyer, EMK Elektronik GmbH
   * r.meyer@emk-elektronik.de
   * www.emk-elektronik.de
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  /*****************************************************************************
   * Date & Time support for internal RTC of MPC52xx
   *****************************************************************************/
  /*#define	DEBUG*/
  
  #include <common.h>
  #include <command.h>
  #include <rtc.h>
  
  #if defined(CONFIG_CMD_DATE)
  
  /*****************************************************************************
   * this structure should be defined in mpc5200.h ...
   *****************************************************************************/
  typedef struct rtc5200 {
  	volatile ulong	tsr;	/* MBAR+0x800: time set register */
  	volatile ulong	dsr;	/* MBAR+0x804: data set register */
  	volatile ulong	nysr;	/* MBAR+0x808: new year and stopwatch register */
  	volatile ulong	aier;	/* MBAR+0x80C: alarm and interrupt enable register */
  	volatile ulong	ctr;	/* MBAR+0x810: current time register */
  	volatile ulong	cdr;	/* MBAR+0x814: current data register */
  	volatile ulong	asir;	/* MBAR+0x818: alarm and stopwatch interrupt register */
  	volatile ulong	piber;	/* MBAR+0x81C: periodic interrupt and bus error register */
  	volatile ulong	trdr;	/* MBAR+0x820: test register/divides register */
  } RTC5200;
  
  #define	RTC_SET		0x02000000
  #define	RTC_PAUSE	0x01000000
  
  /*****************************************************************************
   * get time
   *****************************************************************************/
  int rtc_get (struct rtc_time *tmp)
  {
  	RTC5200	*rtc = (RTC5200 *) (CONFIG_SYS_MBAR+0x800);
  	ulong time, date, time2;
  
  	/* read twice to avoid getting a funny time when the second is just changing */
  	do {
  		time = rtc->ctr;
  		date = rtc->cdr;
  		time2 = rtc->ctr;
  	} while (time != time2);
  
  	tmp->tm_year	= date & 0xfff;
  	tmp->tm_mon		= (date >> 24) & 0xf;
  	tmp->tm_mday	= (date >> 16) & 0x1f;
  	tmp->tm_wday	= (date >> 21) & 7;
  	/* sunday is 7 in 5200 but 0 in rtc_time */
  	if (tmp->tm_wday == 7)
  		tmp->tm_wday = 0;
  	tmp->tm_hour	= (time >> 16) & 0x1f;
  	tmp->tm_min		= (time >> 8) & 0x3f;
  	tmp->tm_sec		= time & 0x3f;
  
  	debug ( "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);
  
  	return 0;
  }
  
  /*****************************************************************************
   * set time
   *****************************************************************************/
  int rtc_set (struct rtc_time *tmp)
  {
  	RTC5200	*rtc = (RTC5200 *) (CONFIG_SYS_MBAR+0x800);
  	ulong time, date, year;
  
  	debug ( "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);
  
  	time = (tmp->tm_hour << 16) | (tmp->tm_min << 8) | tmp->tm_sec;
  	date = (tmp->tm_mon << 16) | tmp->tm_mday;
  	if (tmp->tm_wday == 0)
  		date |= (7 << 8);
  	else
  		date |= (tmp->tm_wday << 8);
  	year = tmp->tm_year;
  
  	/* mask unwanted bits that might show up when rtc_time is corrupt */
  	time &= 0x001f3f3f;
  	date &= 0x001f071f;
  	year &= 0x00000fff;
  
  	/* pause and set the RTC */
  	rtc->nysr = year;
  	rtc->dsr = date | RTC_PAUSE;
  	udelay (1000);
  	rtc->dsr = date | RTC_PAUSE | RTC_SET;
  	udelay (1000);
  	rtc->dsr = date | RTC_PAUSE;
  	udelay (1000);
  	rtc->dsr = date;
  	udelay (1000);
  
  	rtc->tsr = time | RTC_PAUSE;
  	udelay (1000);
  	rtc->tsr = time | RTC_PAUSE | RTC_SET;
  	udelay (1000);
  	rtc->tsr = time | RTC_PAUSE;
  	udelay (1000);
  	rtc->tsr = time;
  	udelay (1000);
  
  	return 0;
  }
  
  /*****************************************************************************
   * reset rtc circuit
   *****************************************************************************/
  void rtc_reset (void)
  {
  	return;	/* nothing to do */
  }
  
  #endif