LXR uboot/post/board/lwmon5/watchdog.c

   1/*
   2 * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
   3 *
   4 * Developed for DENX Software Engineering GmbH
   5 *
   6 * See file CREDITS for list of people who contributed to this
   7 * project.
   8 *
   9 * This program is free software; you can redistribute it and/or
  10 * modify it under the terms of the GNU General Public License as
  11 * published by the Free Software Foundation; either version 2 of
  12 * the License, or (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22 * MA 02111-1307 USA
  23 */
  24
  25#include <common.h>
  26
  27/* This test verifies if the reason of last reset was an abnormal voltage
  28 * condition, than it performs watchdog test, measuing time required to
  29 * trigger watchdog reset.
  30 */
  31
  32#include <post.h>
  33
  34#if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG
  35
  36#include <watchdog.h>
  37#include <asm/ppc4xx-gpio.h>
  38#include <asm/io.h>
  39
  40static uint watchdog_magic_read(void)
  41{
  42        return in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
  43                CONFIG_SYS_WATCHDOG_MAGIC_MASK;
  44}
  45
  46static void watchdog_magic_write(uint value)
  47{
  48        out_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR, value |
  49                (in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
  50                        ~CONFIG_SYS_WATCHDOG_MAGIC_MASK));
  51}
  52
  53int sysmon1_post_test(int flags)
  54{
  55        if (gpio_read_in_bit(CONFIG_SYS_GPIO_SYSMON_STATUS) == 0) {
  56                /*
  57                 * 3.1. GPIO62 is low
  58                 * Assuming system voltage failure.
  59                 */
  60                post_log("sysmon1 Abnormal voltage detected (GPIO62)\n");
  61                post_log("POST sysmon1 FAILED\n");
  62                return 1;
  63        } else {
  64                post_log("sysmon1 PASSED\n");
  65        }
  66
  67        return 0;
  68}
  69
  70int lwmon5_watchdog_post_test(int flags)
  71{
  72        /* On each reset scratch register 1 should be tested,
  73         * but first test GPIO62:
  74         */
  75        if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) {
  76                /* 3.1. GPIO62 is low
  77                 * Assuming system voltage failure.
  78                 */
  79                /* 3.1.1. Set scratch register 1 to 0x0000xxxx */
  80                watchdog_magic_write(0);
  81                /* 3.1.2. Mark test as failed due to voltage?! */
  82                return 1;
  83        }
  84
  85        if (watchdog_magic_read() != CONFIG_SYS_WATCHDOG_MAGIC) {
  86                /* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
  87                 * Assuming PowerOn
  88                 */
  89                int ints;
  90                ulong base;
  91                ulong time;
  92
  93                /* 3.2.1. Set magic value to scratch register */
  94                watchdog_magic_write(CONFIG_SYS_WATCHDOG_MAGIC);
  95
  96                ints = disable_interrupts ();
  97                /* 3.2.2. strobe watchdog once */
  98                WATCHDOG_RESET();
  99                out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, 0);
 100                /* 3.2.3. save time of strobe in scratch register 2 */
 101                base = post_time_ms (0);
 102
 103                /* 3.2.4. Wait for 150 ms (enough for reset to happen) */
 104                while ((time = post_time_ms (base)) < 150)
 105                        out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, time);
 106                if (ints)
 107                        enable_interrupts ();
 108
 109                /* 3.2.5. Reset didn't happen. - Set 0x0000xxxx
 110                 * into scratch register 1
 111                 */
 112                watchdog_magic_write(0);
 113                /* 3.2.6. Mark test as failed. */
 114                post_log("hw watchdog time : %u ms, failed ", time);
 115                return 2;
 116        } else {
 117                /* 3.3. Scratch register matches magic value 0x1248xxxx
 118                 * Assume this is watchdog-initiated reset
 119                 */
 120                ulong time;
 121                /* 3.3.1. So, the test succeed, save measured time to syslog. */
 122                time = in_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR);
 123                if (time > 90 ) { /* ms*/
 124                        post_log("hw watchdog time : %u ms, passed ", time);
 125                        /* 3.3.2. Set scratch register 1 to 0x0000xxxx */
 126                        watchdog_magic_write(0);
 127                        return 0;
 128                } else {
 129                        /*test minimum watchdogtime */
 130                        post_log("hw watchdog time : %u ms, failed ", time);
 131                        return 2;
 132                }
 133        }
 134        return -1;
 135}
 136
 137#endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */
 138