1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* (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.
*/
#ifdef CONFIG_POST
#include <post.h>
#if CONFIG_POST & CFG_POST_WATCHDOG
#include <watchdog.h>
#include <asm/gpio.h>
#include <asm/io.h>
static uint watchdog_magic_read(void)
{
return in_be32((void *)CFG_WATCHDOG_FLAGS_ADDR) &
CFG_WATCHDOG_MAGIC_MASK;
}
static void watchdog_magic_write(uint value)
{
out_be32((void *)CFG_WATCHDOG_FLAGS_ADDR, value |
(in_be32((void *)CFG_WATCHDOG_FLAGS_ADDR) &
~CFG_WATCHDOG_MAGIC_MASK));
}
int sysmon1_post_test(int flags)
{
if (gpio_read_in_bit(CFG_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)
{
ulong time;
/* 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() != CFG_WATCHDOG_MAGIC) {
/*
* 3.2. Scratch register 1 differs from magic value 0x1248xxxx
* Assuming PowerOn
*/
int ints;
ulong base;
/* 3.2.1. Set magic value to scratch register */
watchdog_magic_write(CFG_WATCHDOG_MAGIC);
ints = disable_interrupts ();
/* 3.2.2. strobe watchdog once */
WATCHDOG_RESET();
out_be32((void *)CFG_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 *)CFG_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;
}
/*
* 3.3. Scratch register matches magic value 0x1248xxxx
* Assume this is watchdog-initiated reset
*/
/* 3.3.1. So, the test succeed, save measured time to syslog. */
time = in_be32((void *)CFG_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;
}
#endif /* CONFIG_POST & CFG_POST_WATCHDOG */
#endif /* CONFIG_POST */
|
