/*
   * Freescale i.MX28 RTC Driver
   *
   * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
   * on behalf of DENX Software Engineering GmbH
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #include <common.h>
  #include <rtc.h>
  #include <asm/io.h>
  #include <asm/arch/imx-regs.h>
  #include <asm/arch/sys_proto.h>
  
  #define	MXS_RTC_MAX_TIMEOUT	1000000
  
  /* Set time in seconds since 1970-01-01 */
  int mxs_rtc_set_time(uint32_t secs)
  {
  	struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE;
  	int ret;
  
  	writel(secs, &rtc_regs->hw_rtc_seconds);
  
  	/*
  	 * The 0x80 here means seconds were copied to analog. This information
  	 * is taken from the linux kernel driver for the STMP37xx RTC since
  	 * documentation doesn't mention it.
  	 */
  	ret = mxs_wait_mask_clr(&rtc_regs->hw_rtc_stat_reg,
  		0x80 << RTC_STAT_STALE_REGS_OFFSET, MXS_RTC_MAX_TIMEOUT);
  
  	if (ret)
  		printf("MXS RTC: Timeout waiting for update
  ");
  
  	return ret;
  }
  
  int rtc_get(struct rtc_time *time)
  {
  	struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE;
  	uint32_t secs;
  
  	secs = readl(&rtc_regs->hw_rtc_seconds);
  	to_tm(secs, time);
  
  	return 0;
  }
  
  int rtc_set(struct rtc_time *time)
  {
  	uint32_t secs;
  
  	secs = mktime(time->tm_year, time->tm_mon, time->tm_mday,
  		time->tm_hour, time->tm_min, time->tm_sec);
  
  	return mxs_rtc_set_time(secs);
  }
  
  void rtc_reset(void)
  {
  	struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE;
  	int ret;
  
  	/* Set time to 1970-01-01 */
  	mxs_rtc_set_time(0);
  
  	/* Reset the RTC block */
  	ret = mxs_reset_block(&rtc_regs->hw_rtc_ctrl_reg);
  	if (ret)
  		printf("MXS RTC: Block reset timeout
  ");
  }