Eric Lee / smarc-uboot

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drivers/rtc/ftrtc010.c 2.59 KB
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d41ce506b   Eric Lee   Initial Release, ... 
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  /*
   * Faraday FTRTC010 Real Time Clock
   *
   * (C) Copyright 2009 Faraday Technology
   * Po-Yu Chuang <ratbert@faraday-tech.com>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <config.h>
  #include <common.h>
  #include <rtc.h>
  #include <asm/io.h>
  
  struct ftrtc010 {
  	unsigned int sec;		/* 0x00 */
  	unsigned int min;		/* 0x04 */
  	unsigned int hour;		/* 0x08 */
  	unsigned int day;		/* 0x0c */
  	unsigned int alarm_sec;		/* 0x10 */
  	unsigned int alarm_min;		/* 0x14 */
  	unsigned int alarm_hour;	/* 0x18 */
  	unsigned int record;		/* 0x1c */
  	unsigned int cr;		/* 0x20 */
  	unsigned int wsec;		/* 0x24 */
  	unsigned int wmin;		/* 0x28 */
  	unsigned int whour;		/* 0x2c */
  	unsigned int wday;		/* 0x30 */
  	unsigned int intr;		/* 0x34 */
  	unsigned int div;		/* 0x38 */
  	unsigned int rev;		/* 0x3c */
  };
  
  /*
   * RTC Control Register
   */
  #define FTRTC010_CR_ENABLE		(1 << 0)
  #define FTRTC010_CR_INTERRUPT_SEC	(1 << 1)	/* per second irq */
  #define FTRTC010_CR_INTERRUPT_MIN	(1 << 2)	/* per minute irq */
  #define FTRTC010_CR_INTERRUPT_HR	(1 << 3)	/* per hour   irq */
  #define FTRTC010_CR_INTERRUPT_DAY	(1 << 4)	/* per day    irq */
  
  static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE;
  
  static void ftrtc010_enable(void)
  {
  	writel(FTRTC010_CR_ENABLE, &rtc->cr);
  }
  
  /*
   * return current time in seconds
   */
  static unsigned long ftrtc010_time(void)
  {
  	unsigned long day;
  	unsigned long hour;
  	unsigned long minute;
  	unsigned long second;
  	unsigned long second2;
  
  	do {
  		second	= readl(&rtc->sec);
  		day	= readl(&rtc->day);
  		hour	= readl(&rtc->hour);
  		minute	= readl(&rtc->min);
  		second2	= readl(&rtc->sec);
  	} while (second != second2);
  
  	return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second;
  }
  
  /*
   * Get the current time from the RTC
   */
  
  int rtc_get(struct rtc_time *tmp)
  {
  	unsigned long now;
  
  	debug("%s(): record register: %x
  ",
  	      __func__, readl(&rtc->record));
  
  #ifdef CONFIG_FTRTC010_PCLK
  	now = (ftrtc010_time() + readl(&rtc->record)) / RTC_DIV_COUNT;
  #else /* CONFIG_FTRTC010_EXTCLK */
  	now = ftrtc010_time() + readl(&rtc->record);
  #endif
  
  	rtc_to_tm(now, tmp);
  
  	return 0;
  }
  
  /*
   * Set the RTC
   */
  int rtc_set(struct rtc_time *tmp)
  {
  	unsigned long new;
  	unsigned long now;
  
  	debug("%s(): DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d
  ",
  	      __func__,
  	      tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  	      tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  
  	new = rtc_mktime(tmp);
  
  	now = ftrtc010_time();
  
  	debug("%s(): write %lx to record register
  ", __func__, new - now);
  
  	writel(new - now, &rtc->record);
  
  	return 0;
  }
  
  void rtc_reset(void)
  {
  	debug("%s()
  ", __func__);
  	ftrtc010_enable();
  }