1 files changed, 78 insertions, 0 deletions
diff --git a/post/watchdog.c b/post/watchdog.c
new file mode 100644
index 0000000..0cdfbf0
--- /dev/null
+++ b/post/watchdog.c
@@ -0,0 +1,78 @@
+/*
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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>
+
+/*
+ * Watchdog test
+ *
+ * The test verifies the watchdog timer operation.
+ * On the first iteration, the test routine disables interrupts and
+ * makes a 10-second delay. If the system does not reboot during this delay,
+ * the watchdog timer is not operational and the test fails. If the system
+ * reboots, on the second iteration the test routine reports a success.
+ */
+
+#ifdef CONFIG_POST
+
+#include <post.h>
+#include <watchdog.h>
+
+#if CONFIG_POST & CFG_POST_WATCHDOG
+
+static ulong gettbl (void)
+{
+	ulong r;
+
+  asm ("mftbl %0":"=r" (r));
+
+	return r;
+}
+
+int watchdog_post_test (int flags)
+{
+	if (flags & POST_REBOOT) {
+		/* Test passed */
+
+		return 0;
+	} else {
+		/* 10-second delay */
+		int ints = disable_interrupts ();
+		ulong base = gettbl ();
+		ulong clk = get_tbclk ();
+
+		while ((gettbl () - base) / 10 < clk);
+
+		if (ints)
+			enable_interrupts ();
+
+                /*
+                 * If we have reached this point, the watchdog timer
+		 * does not work
+		 */
+		return -1;
+	}
+}
+
+#endif /* CONFIG_POST & CFG_POST_WATCHDOG */
+#endif /* CONFIG_POST */