text: // SPDX-License-Identifier: GPL-2.0+
  /*
   * Copyright (C) 2019 Frank Wunderlich <frank-w@public-files.de>
   */
  
  #include <common.h>
  #include <command.h>
  #include <asm/io.h>
  #include <linux/delay.h>
  
  #define PWRAP_BASE		0x1000d000
  #define PWRAP_WACS2_CMD		0x9c
  
  #define PWRAP_CALC(adr, wdata) ((1 << 31) | (((adr) >> 1) << 16) | (wdata))
  
  #define MT6323_PWRC_BASE	0x8000
  #define RTC_BBPU		0x0000
  #define RTC_BBPU_KEY		(0x43 << 8)
  #define RTC_WRTGR		0x003c
  
  int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  {
  	u32 addr, val;
  
  	addr = PWRAP_BASE + PWRAP_WACS2_CMD;
  	val = PWRAP_CALC(MT6323_PWRC_BASE + RTC_BBPU, RTC_BBPU_KEY);
  	writel(val, addr);
  
  	mdelay(10);
  
  	val = PWRAP_CALC(MT6323_PWRC_BASE + RTC_WRTGR, 1);
  	writel(val, addr);
  
  	// wait some time and then print error
  	mdelay(10000);
  	printf("Failed to power off!!!\n");
  	return 1;
  }
  