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bootloader/u-boot_2015_04/drivers/rtc/mvrtc.c 2.83 KB
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6b13f685e   김민수   BSP 최초 추가 
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  /*
   * Copyright (C) 2011
   * Jason Cooper <u-boot@lakedaemon.net>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  /*
   * Date & Time support for Marvell Integrated RTC
   */
  
  #include <common.h>
  #include <command.h>
  #include <rtc.h>
  #include <asm/io.h>
  #include "mvrtc.h"
  
  /* This RTC does not support century, so we assume 20 */
  #define CENTURY 20
  
  int rtc_get(struct rtc_time *t)
  {
  	u32 time;
  	u32 date;
  	struct mvrtc_registers *mvrtc_regs;
  
  	mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
  
  	/* read the time register */
  	time = readl(&mvrtc_regs->time);
  
  	/* read the date register */
  	date = readl(&mvrtc_regs->date);
  
  	/* test for 12 hour clock (can't tell if it's am/pm) */
  	if (time & MVRTC_HRFMT_MSK) {
  		printf("Error: RTC in 12 hour mode, can't determine AM/PM.
  ");
  		return -1;
  	}
  
  	/* time */
  	t->tm_sec  = bcd2bin((time >> MVRTC_SEC_SFT)  & MVRTC_SEC_MSK);
  	t->tm_min  = bcd2bin((time >> MVRTC_MIN_SFT)  & MVRTC_MIN_MSK);
  	t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
  	t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT)  & MVRTC_DAY_MSK);
  	t->tm_wday--;
  
  	/* date */
  	t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
  	t->tm_mon  = bcd2bin((date >> MVRTC_MON_SFT)  & MVRTC_MON_MSK);
  	t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
  	t->tm_year += CENTURY * 100;
  
  	/* not supported in this RTC */
  	t->tm_yday  = 0;
  	t->tm_isdst = 0;
  
  	return 0;
  }
  
  int rtc_set(struct rtc_time *t)
  {
  	u32 time = 0; /* sets hour format bit to zero, 24hr format. */
  	u32 date = 0;
  	struct mvrtc_registers *mvrtc_regs;
  
  	mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
  
  	/* check that this code isn't 80+ years old ;-) */
  	if ((t->tm_year / 100) != CENTURY)
  		printf("Warning: Only century %d supported.
  ", CENTURY);
  
  	/* time */
  	time |= (bin2bcd(t->tm_sec)      & MVRTC_SEC_MSK)  << MVRTC_SEC_SFT;
  	time |= (bin2bcd(t->tm_min)      & MVRTC_MIN_MSK)  << MVRTC_MIN_SFT;
  	time |= (bin2bcd(t->tm_hour)     & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
  	time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK)  << MVRTC_DAY_SFT;
  
  	/* date */
  	date |= (bin2bcd(t->tm_mday)       & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
  	date |= (bin2bcd(t->tm_mon)        & MVRTC_MON_MSK)  << MVRTC_MON_SFT;
  	date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
  
  	/* write the time register */
  	writel(time, &mvrtc_regs->time);
  
  	/* write the date register */
  	writel(date, &mvrtc_regs->date);
  
  	return 0;
  }
  
  void rtc_reset(void)
  {
  	u32 time;
  	u32 sec;
  	struct mvrtc_registers *mvrtc_regs;
  
  	mvrtc_regs = (struct mvrtc_registers *)KW_RTC_BASE;
  
  	/* no init routine for this RTC needed, just check that it's working */
  	time = readl(&mvrtc_regs->time);
  	sec  = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
  	udelay(1000000);
  	time = readl(&mvrtc_regs->time);
  
  	if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
  		printf("Error: RTC did not increment.
  ");
  }