reboot-mode: add support for reboot mode control

A new driver uclass is created to handle the reboot mode control.

The new uclass driver is updating an environment variable with the
configured reboot mode. The mode is extracted from a map provided
at initialization time. The map contains a list of modes
and associated ids.

Signed-off-by: Nandor Han <nandor.han@vaisala.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/include/reboot-mode/reboot-mode.h b/include/reboot-mode/reboot-mode.h
new file mode 100644
index 00000000000..86b51f881ca
--- /dev/null
+++ b/include/reboot-mode/reboot-mode.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c), Vaisala Oyj
+ */
+
+#ifndef REBOOT_MODE_REBOOT_MODE_H__
+#define REBOOT_MODE_REBOOT_MODE_H__
+
+#include <asm/types.h>
+#include <dm/device.h>
+
+struct reboot_mode_mode {
+	const char *mode_name;
+	u32 mode_id;
+};
+
+struct reboot_mode_uclass_platdata {
+	struct reboot_mode_mode *modes;
+	u8 count;
+	const char *env_variable;
+};
+
+struct reboot_mode_ops {
+	/**
+	 * get() - get the current reboot mode value
+	 *
+	 * Returns the current value from the reboot mode backing store.
+	 *
+	 * @dev:	Device to read from
+	 * @rebootmode:	Address to save the current reboot mode value
+	 */
+	int (*get)(struct udevice *dev, u32 *rebootmode);
+
+	/**
+	 * set() - set a reboot mode value
+	 *
+	 * Sets the value in the reboot mode backing store.
+	 *
+	 * @dev:	Device to read from
+	 * @rebootmode:	New reboot mode value to store
+	 */
+	int (*set)(struct udevice *dev, u32 rebootmode);
+};
+
+/* Access the operations for a reboot mode device */
+#define reboot_mode_get_ops(dev) ((struct reboot_mode_ops *)(dev)->driver->ops)
+
+/**
+ * dm_reboot_mode_update() - Update the reboot mode env variable.
+ *
+ * @dev:	Device to read from
+ * @return 0 if OK, -ve on error
+ */
+int dm_reboot_mode_update(struct udevice *dev);
+
+#endif /* REBOOT_MODE_REBOOT_MODE_H__ */