Enable a way to provide the reason for "being here"

Many architectures support a way to detect why the bootloader is running.
This patch adds a global variable to be able to use the cause in some kind of
shell code to do special things on demand. For example to do an emergency boot,
when the last boot fails and the watchdog reactivate the hanging system.

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 27 insertions, 0 deletions

diff --git a/include/reset_source.h b/include/reset_source.h
new file mode 100644
index 0000000000..6734fbdee6
--- /dev/null
+++ b/include/reset_source.h
@@ -0,0 +1,27 @@
+/*
+ * 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.
+ */
+
+#ifndef __INCLUDE_RESET_SOURCE_H
+# define __INCLUDE_RESET_SOURCE_H
+
+enum reset_src_type {
+	RESET_UKWN,	/* maybe the SoC cannot detect the reset source */
+	RESET_POR,	/* Power On Reset (cold start) */
+	RESET_RST,	/* generic ReSeT (warm start) */
+	RESET_WDG,	/* watchdog */
+	RESET_WKE,	/* wake-up (some SoCs can handle this) */
+	RESET_JTAG,	/* JTAG reset */
+};
+
+void set_reset_source(enum reset_src_type);
+
+#endif /* __INCLUDE_RESET_SOURCE_H */