text: /*
   * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
   *
   * Developed for DENX Software Engineering GmbH
   *
   * See file CREDITS for list of people who contributed to this
   * project.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation; either version 2 of
   * the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
   * MA 02111-1307 USA
   */
  
  #include <common.h>
  
  /* This test verifies if the reason of last reset was an abnormal voltage
   * condition, than it performs watchdog test, measuing time required to
   * trigger watchdog reset.
   */
  
  #include <post.h>
  
  #if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG
  
  #include <watchdog.h>
  #include <asm/gpio.h>
  #include <asm/io.h>
  
  static uint watchdog_magic_read(void)
  {
  	return in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
  		CONFIG_SYS_WATCHDOG_MAGIC_MASK;
  }
  
  static void watchdog_magic_write(uint value)
  {
  	out_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR, value |
  		(in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
  			~CONFIG_SYS_WATCHDOG_MAGIC_MASK));
  }
  
  int sysmon1_post_test(int flags)
  {
  	if (gpio_read_in_bit(CONFIG_SYS_GPIO_SYSMON_STATUS) == 0) {
  		/*
  		 * 3.1. GPIO62 is low
  		 * Assuming system voltage failure.
  		 */
  		post_log("Abnormal voltage detected (GPIO62)\n");
  		return 1;
  	}
  
  	return 0;
  }
  
  int lwmon5_watchdog_post_test(int flags)
  {
  	/* On each reset scratch register 1 should be tested,
  	 * but first test GPIO62:
  	 */
  	if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) {
  		/* 3.1. GPIO62 is low
  		 * Assuming system voltage failure.
  		 */
  		/* 3.1.1. Set scratch register 1 to 0x0000xxxx */
  		watchdog_magic_write(0);
  		/* 3.1.2. Mark test as failed due to voltage?! */
  		return 1;
  	}
  
  	if (watchdog_magic_read() != CONFIG_SYS_WATCHDOG_MAGIC) {
  		/* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
  		 * Assuming PowerOn
  		 */
  		int ints;
  		ulong base;
  		ulong time;
  
  		/* 3.2.1. Set magic value to scratch register */
  		watchdog_magic_write(CONFIG_SYS_WATCHDOG_MAGIC);
  
  		ints = disable_interrupts ();
  		/* 3.2.2. strobe watchdog once */
  		WATCHDOG_RESET();
  		out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, 0);
  		/* 3.2.3. save time of strobe in scratch register 2 */
  		base = post_time_ms (0);
  
  		/* 3.2.4. Wait for 150 ms (enough for reset to happen) */
  		while ((time = post_time_ms (base)) < 150)
  			out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, time);
  		if (ints)
  			enable_interrupts ();
  
  		/* 3.2.5. Reset didn't happen. - Set 0x0000xxxx
  		 * into scratch register 1
  		 */
  		watchdog_magic_write(0);
  		/* 3.2.6. Mark test as failed. */
  		post_log("hw watchdog time : %u ms, failed ", time);
  		return 2;
  	} else {
  		/* 3.3. Scratch register matches magic value 0x1248xxxx
  		 * Assume this is watchdog-initiated reset
  		 */
  		ulong time;
  		/* 3.3.1. So, the test succeed, save measured time to syslog. */
  		time = in_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR);
  		post_log("hw watchdog time : %u ms, passed ", time);
  		/* 3.3.2. Set scratch register 1 to 0x0000xxxx */
  		watchdog_magic_write(0);
  		return 0;
  	}
  	return -1;
  }
  
  #endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */
  