/*
   * Freescale i.MX27 RTC Driver
   *
   * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <rtc.h>
  #include <asm/io.h>
  #include <asm/arch/imx-regs.h>
  
  #define HOUR_SHIFT 8
  #define HOUR_MASK  0x1f
  #define MIN_SHIFT  0
  #define MIN_MASK   0x3f
  
  int rtc_get(struct rtc_time *time)
  {
  	struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  	uint32_t day, hour, min, sec;
  
  	day  = readl(&rtc_regs->dayr);
  	hour = readl(&rtc_regs->hourmin);
  	sec  = readl(&rtc_regs->seconds);
  
  	min  = (hour >> MIN_SHIFT) & MIN_MASK;
  	hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
  
  	sec += min * 60 + hour * 3600 + day * 24 * 3600;
  
  	rtc_to_tm(sec, time);
  
  	return 0;
  }
  
  int rtc_set(struct rtc_time *time)
  {
  	struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  	uint32_t day, hour, min, sec;
  
  	sec = rtc_mktime(time);
  
  	day  = sec / (24 * 3600);
  	sec  = sec % (24 * 3600);
  	hour = sec / 3600;
  	sec  = sec % 3600;
  	min  = sec / 60;
  	sec  = sec % 60;
  
  	hour  = (hour & HOUR_MASK) << HOUR_SHIFT;
  	hour |= (min & MIN_MASK) << MIN_SHIFT;
  
  	writel(day, &rtc_regs->dayr);
  	writel(hour, &rtc_regs->hourmin);
  	writel(sec, &rtc_regs->seconds);
  
  	return 0;
  }
  
  void rtc_reset(void)
  {
  	struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  
  	writel(0, &rtc_regs->dayr);
  	writel(0, &rtc_regs->hourmin);
  	writel(0, &rtc_regs->seconds);
  }