]> git.ipfire.org Git - people/ms/u-boot.git/blob - post/board/lwmon5/watchdog.c
rename CFG_ macros to CONFIG_SYS
[people/ms/u-boot.git] / 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/gpio.h>
38 #include <asm/io.h>
39
40 static uint watchdog_magic_read(void)
41 {
42 return in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) &
43 CONFIG_SYS_WATCHDOG_MAGIC_MASK;
44 }
45
46 static 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
53 int 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("Abnormal voltage detected (GPIO62)\n");
61 return 1;
62 }
63
64 return 0;
65 }
66
67 int lwmon5_watchdog_post_test(int flags)
68 {
69 /* On each reset scratch register 1 should be tested,
70 * but first test GPIO62:
71 */
72 if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) {
73 /* 3.1. GPIO62 is low
74 * Assuming system voltage failure.
75 */
76 /* 3.1.1. Set scratch register 1 to 0x0000xxxx */
77 watchdog_magic_write(0);
78 /* 3.1.2. Mark test as failed due to voltage?! */
79 return 1;
80 }
81
82 if (watchdog_magic_read() != CONFIG_SYS_WATCHDOG_MAGIC) {
83 /* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
84 * Assuming PowerOn
85 */
86 int ints;
87 ulong base;
88 ulong time;
89
90 /* 3.2.1. Set magic value to scratch register */
91 watchdog_magic_write(CONFIG_SYS_WATCHDOG_MAGIC);
92
93 ints = disable_interrupts ();
94 /* 3.2.2. strobe watchdog once */
95 WATCHDOG_RESET();
96 out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, 0);
97 /* 3.2.3. save time of strobe in scratch register 2 */
98 base = post_time_ms (0);
99
100 /* 3.2.4. Wait for 150 ms (enough for reset to happen) */
101 while ((time = post_time_ms (base)) < 150)
102 out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, time);
103 if (ints)
104 enable_interrupts ();
105
106 /* 3.2.5. Reset didn't happen. - Set 0x0000xxxx
107 * into scratch register 1
108 */
109 watchdog_magic_write(0);
110 /* 3.2.6. Mark test as failed. */
111 post_log("hw watchdog time : %u ms, failed ", time);
112 return 2;
113 } else {
114 /* 3.3. Scratch register matches magic value 0x1248xxxx
115 * Assume this is watchdog-initiated reset
116 */
117 ulong time;
118 /* 3.3.1. So, the test succeed, save measured time to syslog. */
119 time = in_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR);
120 post_log("hw watchdog time : %u ms, passed ", time);
121 /* 3.3.2. Set scratch register 1 to 0x0000xxxx */
122 watchdog_magic_write(0);
123 return 0;
124 }
125 return -1;
126 }
127
128 #endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */