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-rw-r--r--post/board/lwmon5/watchdog.c131
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diff --git a/post/board/lwmon5/watchdog.c b/post/board/lwmon5/watchdog.c
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+/*
+ * (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)
+{
+ /* 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;
+ ulong time;
+
+ /* 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;
+ } else {
+ /* 3.3. Scratch register matches magic value 0x1248xxxx
+ * Assume this is watchdog-initiated reset
+ */
+ ulong time;
+ /* 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;
+ }
+ return -1;
+}
+
+
+#endif /* CONFIG_POST & CFG_POST_WATCHDOG */
+#endif /* CONFIG_POST */