Yuri Tikhonov | 65b20dc | 2008-02-04 14:10:42 +0100 | [diff] [blame^] | 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 | #ifdef CONFIG_POST |
| 33 | |
| 34 | #include <post.h> |
| 35 | |
| 36 | #if CONFIG_POST & CFG_POST_WATCHDOG |
| 37 | |
| 38 | #include <watchdog.h> |
| 39 | #include <asm/gpio.h> |
| 40 | #include <asm/io.h> |
| 41 | |
| 42 | static uint watchdog_magic_read(void) |
| 43 | { |
| 44 | return in_be32((void *)CFG_WATCHDOG_FLAGS_ADDR) & |
| 45 | CFG_WATCHDOG_MAGIC_MASK; |
| 46 | } |
| 47 | |
| 48 | static void watchdog_magic_write(uint value) |
| 49 | { |
| 50 | out_be32((void *)CFG_WATCHDOG_FLAGS_ADDR, value | |
| 51 | (in_be32((void *)CFG_WATCHDOG_FLAGS_ADDR) & |
| 52 | ~CFG_WATCHDOG_MAGIC_MASK)); |
| 53 | } |
| 54 | |
| 55 | int sysmon1_post_test(int flags) |
| 56 | { |
| 57 | if (gpio_read_in_bit(CFG_GPIO_SYSMON_STATUS)) { |
| 58 | /* 3.1. GPIO62 is low |
| 59 | * Assuming system voltage failure. |
| 60 | */ |
| 61 | post_log("Abnormal voltage detected (GPIO62)\n"); |
| 62 | return 1; |
| 63 | } |
| 64 | |
| 65 | return 0; |
| 66 | } |
| 67 | |
| 68 | int lwmon5_watchdog_post_test(int flags) |
| 69 | { |
| 70 | /* On each reset scratch register 1 should be tested, |
| 71 | * but first test GPIO62: |
| 72 | */ |
| 73 | if (!(flags & POST_MANUAL) && sysmon1_post_test(flags)) { |
| 74 | /* 3.1. GPIO62 is low |
| 75 | * Assuming system voltage failure. |
| 76 | */ |
| 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?! */ |
| 80 | return 1; |
| 81 | } |
| 82 | |
| 83 | if (watchdog_magic_read() != CFG_WATCHDOG_MAGIC) { |
| 84 | /* 3.2. Scratch register 1 differs from magic value 0x1248xxxx |
| 85 | * Assuming PowerOn |
| 86 | */ |
| 87 | int ints; |
| 88 | ulong base; |
| 89 | ulong time; |
| 90 | |
| 91 | /* 3.2.1. Set magic value to scratch register */ |
| 92 | watchdog_magic_write(CFG_WATCHDOG_MAGIC); |
| 93 | |
| 94 | ints = disable_interrupts (); |
| 95 | /* 3.2.2. strobe watchdog once */ |
| 96 | WATCHDOG_RESET(); |
| 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); |
| 100 | |
| 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); |
| 104 | if (ints) |
| 105 | enable_interrupts (); |
| 106 | |
| 107 | /* 3.2.5. Reset didn't happen. - Set 0x0000xxxx |
| 108 | * into scratch register 1 |
| 109 | */ |
| 110 | watchdog_magic_write(0); |
| 111 | /* 3.2.6. Mark test as failed. */ |
| 112 | post_log("hw watchdog time : %u ms, failed ", time); |
| 113 | return 2; |
| 114 | } else { |
| 115 | /* 3.3. Scratch register matches magic value 0x1248xxxx |
| 116 | * Assume this is watchdog-initiated reset |
| 117 | */ |
| 118 | ulong time; |
| 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); |
| 124 | return 0; |
| 125 | } |
| 126 | return -1; |
| 127 | } |
| 128 | |
| 129 | |
| 130 | #endif /* CONFIG_POST & CFG_POST_WATCHDOG */ |
| 131 | #endif /* CONFIG_POST */ |
| 132 | |