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Diffstat (limited to 'post/board/lwmon5/watchdog.c')
| -rw-r--r-- | post/board/lwmon5/watchdog.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/post/board/lwmon5/watchdog.c b/post/board/lwmon5/watchdog.c new file mode 100644 index 0000000..48ff687 --- /dev/null +++ b/post/board/lwmon5/watchdog.c @@ -0,0 +1,136 @@ +/* + * (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)) { + /* + * 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 */ |