2 * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
4 * Developed for DENX Software Engineering GmbH
6 * See file CREDITS for list of people who contributed to this
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.
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.
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,
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.
36 #if CONFIG_POST & CFG_POST_WATCHDOG
42 static uint watchdog_magic_read(void)
44 return in_be32((void *)CFG_WATCHDOG_FLAGS_ADDR) &
45 CFG_WATCHDOG_MAGIC_MASK;
48 static void watchdog_magic_write(uint value)
50 out_be32((void *)CFG_WATCHDOG_FLAGS_ADDR, value |
51 (in_be32((void *)CFG_WATCHDOG_FLAGS_ADDR) &
52 ~CFG_WATCHDOG_MAGIC_MASK));
55 int sysmon1_post_test(int flags)
57 if (gpio_read_in_bit(CFG_GPIO_SYSMON_STATUS)) {
59 * Assuming system voltage failure.
61 post_log("Abnormal voltage detected (GPIO62)\n");
68 int lwmon5_watchdog_post_test(int flags)
70 /* On each reset scratch register 1 should be tested,
71 * but first test GPIO62:
73 if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) {
75 * Assuming system voltage failure.
77 /* 3.1.1. Set scratch register 1 to 0x0000xxxx */
78 watchdog_magic_write(0);
79 /* 3.1.2. Mark test as failed due to voltage?! */
83 if (watchdog_magic_read() != CFG_WATCHDOG_MAGIC) {
84 /* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
91 /* 3.2.1. Set magic value to scratch register */
92 watchdog_magic_write(CFG_WATCHDOG_MAGIC);
94 ints = disable_interrupts ();
95 /* 3.2.2. strobe watchdog once */
97 out_be32((void *)CFG_WATCHDOG_TIME_ADDR, 0);
98 /* 3.2.3. save time of strobe in scratch register 2 */
99 base = post_time_ms (0);
101 /* 3.2.4. Wait for 150 ms (enough for reset to happen) */
102 while ((time = post_time_ms (base)) < 150)
103 out_be32((void *)CFG_WATCHDOG_TIME_ADDR, time);
105 enable_interrupts ();
107 /* 3.2.5. Reset didn't happen. - Set 0x0000xxxx
108 * into scratch register 1
110 watchdog_magic_write(0);
111 /* 3.2.6. Mark test as failed. */
112 post_log("hw watchdog time : %u ms, failed ", time);
115 /* 3.3. Scratch register matches magic value 0x1248xxxx
116 * Assume this is watchdog-initiated reset
119 /* 3.3.1. So, the test succeed, save measured time to syslog. */
120 time = in_be32((void *)CFG_WATCHDOG_TIME_ADDR);
121 post_log("hw watchdog time : %u ms, passed ", time);
122 /* 3.3.2. Set scratch register 1 to 0x0000xxxx */
123 watchdog_magic_write(0);
130 #endif /* CONFIG_POST & CFG_POST_WATCHDOG */
131 #endif /* CONFIG_POST */