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  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10
  11 /* This test verifies if the reason of last reset was an abnormal voltage
  12  * condition, than it performs watchdog test, measuing time required to
  13  * trigger watchdog reset.
  14  */
  15
  16 #include <post.h>
  17
  18 #if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG
  19
  20 #include <watchdog.h>
  21 #include <asm/ppc4xx-gpio.h>
  22 #include <asm/io.h>
  23
  24 static uint watchdog_magic_read(void)
  25 {
  26         return in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
  27                 CONFIG_SYS_WATCHDOG_MAGIC_MASK;
  28 }
  29
  30 static void watchdog_magic_write(uint value)
  31 {
  32         out_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR, value |
  33                 (in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
  34                         ~CONFIG_SYS_WATCHDOG_MAGIC_MASK));
  35 }
  36
  37 int sysmon1_post_test(int flags)
  38 {
  39         if (gpio_read_in_bit(CONFIG_SYS_GPIO_SYSMON_STATUS) == 0) {
  40                 /*
  41                  * 3.1. GPIO62 is low
  42                  * Assuming system voltage failure.
  43                  */
  44                 post_log("sysmon1 Abnormal voltage detected (GPIO62)\n");
  45                 post_log("POST sysmon1 FAILED\n");
  46                 return 1;
  47         } else {
  48                 post_log("sysmon1 PASSED\n");
  49         }
  50
  51         return 0;
  52 }
  53
  54 int lwmon5_watchdog_post_test(int flags)
  55 {
  56         /* On each reset scratch register 1 should be tested,
  57          * but first test GPIO62:
  58          */
  59         if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) {
  60                 /* 3.1. GPIO62 is low
  61                  * Assuming system voltage failure.
  62                  */
  63                 /* 3.1.1. Set scratch register 1 to 0x0000xxxx */
  64                 watchdog_magic_write(0);
  65                 /* 3.1.2. Mark test as failed due to voltage?! */
  66                 return 1;
  67         }
  68
  69         if (watchdog_magic_read() != CONFIG_SYS_WATCHDOG_MAGIC) {
  70                 /* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
  71                  * Assuming PowerOn
  72                  */
  73                 int ints;
  74                 ulong base;
  75                 ulong time;
  76
  77                 /* 3.2.1. Set magic value to scratch register */
  78                 watchdog_magic_write(CONFIG_SYS_WATCHDOG_MAGIC);
  79
  80                 ints = disable_interrupts ();
  81                 /* 3.2.2. strobe watchdog once */
  82                 WATCHDOG_RESET();
  83                 out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, 0);
  84                 /* 3.2.3. save time of strobe in scratch register 2 */
  85                 base = post_time_ms (0);
  86
  87                 /* 3.2.4. Wait for 150 ms (enough for reset to happen) */
  88                 while ((time = post_time_ms (base)) < 150)
  89                         out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, time);
  90                 if (ints)
  91                         enable_interrupts ();
  92
  93                 /* 3.2.5. Reset didn't happen. - Set 0x0000xxxx
  94                  * into scratch register 1
  95                  */
  96                 watchdog_magic_write(0);
  97                 /* 3.2.6. Mark test as failed. */
  98                 post_log("hw watchdog time : %u ms, failed ", time);
  99                 return 2;
 100         } else {
 101                 /* 3.3. Scratch register matches magic value 0x1248xxxx
 102                  * Assume this is watchdog-initiated reset
 103                  */
 104                 ulong time;
 105                 /* 3.3.1. So, the test succeed, save measured time to syslog. */
 106                 time = in_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR);
 107                 if (time > 90 ) { /* ms*/
 108                         post_log("hw watchdog time : %u ms, passed ", time);
 109                         /* 3.3.2. Set scratch register 1 to 0x0000xxxx */
 110                         watchdog_magic_write(0);
 111                         return 0;
 112                 } else {
 113                         /*test minimum watchdogtime */
 114                         post_log("hw watchdog time : %u ms, failed ", time);
 115                         return 2;
 116                 }
 117         }
 118         return -1;
 119 }
 120
 121 #endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */