]>
Commit | Line | Data |
---|---|---|
8f15d4ad YT |
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 | ||
65b20dce | 27 | /* This test verifies if the reason of last reset was an abnormal voltage |
8f15d4ad YT |
28 | * condition, than it performs watchdog test, measuing time required to |
29 | * trigger watchdog reset. | |
30 | */ | |
31 | ||
8f15d4ad YT |
32 | #include <post.h> |
33 | ||
6d0f6bcf | 34 | #if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG |
8f15d4ad YT |
35 | |
36 | #include <watchdog.h> | |
37 | #include <asm/gpio.h> | |
38 | #include <asm/io.h> | |
39 | ||
40 | static uint watchdog_magic_read(void) | |
41 | { | |
6d0f6bcf JCPV |
42 | return in_be32((void *)CONFIG_SYS_WATCHDOG_FLAGS_ADDR) & |
43 | CONFIG_SYS_WATCHDOG_MAGIC_MASK; | |
8f15d4ad YT |
44 | } |
45 | ||
46 | static void watchdog_magic_write(uint value) | |
47 | { | |
6d0f6bcf JCPV |
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)); | |
8f15d4ad YT |
51 | } |
52 | ||
53 | int sysmon1_post_test(int flags) | |
54 | { | |
6d0f6bcf | 55 | if (gpio_read_in_bit(CONFIG_SYS_GPIO_SYSMON_STATUS) == 0) { |
3e4615ab SL |
56 | /* |
57 | * 3.1. GPIO62 is low | |
8f15d4ad YT |
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)) { | |
65b20dce | 73 | /* 3.1. GPIO62 is low |
8f15d4ad YT |
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 | ||
6d0f6bcf | 82 | if (watchdog_magic_read() != CONFIG_SYS_WATCHDOG_MAGIC) { |
65b20dce | 83 | /* 3.2. Scratch register 1 differs from magic value 0x1248xxxx |
8f15d4ad YT |
84 | * Assuming PowerOn |
85 | */ | |
86 | int ints; | |
87 | ulong base; | |
65b20dce | 88 | ulong time; |
8f15d4ad YT |
89 | |
90 | /* 3.2.1. Set magic value to scratch register */ | |
6d0f6bcf | 91 | watchdog_magic_write(CONFIG_SYS_WATCHDOG_MAGIC); |
8f15d4ad YT |
92 | |
93 | ints = disable_interrupts (); | |
94 | /* 3.2.2. strobe watchdog once */ | |
95 | WATCHDOG_RESET(); | |
6d0f6bcf | 96 | out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, 0); |
8f15d4ad YT |
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) | |
6d0f6bcf | 102 | out_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR, time); |
8f15d4ad YT |
103 | if (ints) |
104 | enable_interrupts (); | |
105 | ||
65b20dce | 106 | /* 3.2.5. Reset didn't happen. - Set 0x0000xxxx |
8f15d4ad YT |
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; | |
65b20dce YT |
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. */ | |
6d0f6bcf | 119 | time = in_be32((void *)CONFIG_SYS_WATCHDOG_TIME_ADDR); |
65b20dce YT |
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; | |
8f15d4ad | 124 | } |
65b20dce | 125 | return -1; |
81a0ac62 | 126 | } |
8f15d4ad | 127 | |
6d0f6bcf | 128 | #endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */ |