1 files changed, 146 insertions, 0 deletions
diff --git a/include/sysreset.h b/include/sysreset.h
new file mode 100644
index 00000000000..ff20abdeed3
--- /dev/null
+++ b/include/sysreset.h
@@ -0,0 +1,146 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef __SYSRESET_H
+#define __SYSRESET_H
+
+struct udevice;
+
+/**
+ * enum sysreset_t - system reset types
+ */
+enum sysreset_t {
+	/** @SYSRESET_WARM: reset CPU, keep GPIOs active */
+	SYSRESET_WARM,
+	/** @SYSRESET_COLD: reset CPU and GPIOs */
+	SYSRESET_COLD,
+	/** @SYSRESET_POWER: reset PMIC (remove and restore power) */
+	SYSRESET_POWER,
+	/** @SYSRESET_POWER_OFF: turn off power */
+	SYSRESET_POWER_OFF,
+	/** @SYSRESET_COUNT: number of available reset types */
+	SYSRESET_COUNT,
+};
+
+/**
+ * struct sysreset_ops - operations of system reset drivers
+ */
+struct sysreset_ops {
+	/**
+	 * @request:	request a sysreset of the given type
+	 *
+	 * Note that this function may return before the reset takes effect.
+	 *
+	 * @dev:	Device to be used for system reset
+	 * @type:	Reset type to request
+	 * Return:
+	 * -EINPROGRESS if the reset has been started and
+	 * will complete soon, -EPROTONOSUPPORT if not supported
+	 * by this device, 0 if the reset has already happened
+	 * (in which case this method will not actually return)
+	 */
+	int (*request)(struct udevice *dev, enum sysreset_t type);
+	/**
+	 * @get_status:	get printable reset status information
+	 *
+	 * @dev:	Device to check
+	 * @buf:	Buffer to receive the textual reset information
+	 * @size:	Size of the passed buffer
+	 * Return:	0 if OK, -ve on error
+	 */
+	int (*get_status)(struct udevice *dev, char *buf, int size);
+
+	/**
+	 * @get_last:	get information on the last reset
+	 *
+	 * @dev:	Device to check
+	 * Return:	last reset state (enum :enum:`sysreset_t`) or -ve error
+	 */
+	int (*get_last)(struct udevice *dev);
+};
+
+#define sysreset_get_ops(dev)        ((struct sysreset_ops *)(dev)->driver->ops)
+
+/**
+ * sysreset_request() - request a sysreset
+ *
+ * @dev:	Device to be used for system reset
+ * @type:	Reset type to request
+ * Return:	0 if OK, -EPROTONOSUPPORT if not supported by this device
+ */
+int sysreset_request(struct udevice *dev, enum sysreset_t type);
+
+/**
+ * sysreset_get_status() - get printable reset status information
+ *
+ * @dev:	Device to check
+ * @buf:	Buffer to receive the textual reset information
+ * @size:	Size of the passed buffer
+ * Return:	 0 if OK, -ve on error
+ */
+int sysreset_get_status(struct udevice *dev, char *buf, int size);
+
+/**
+ * sysreset_get_last() - get information on the last reset
+ *
+ * @dev:	Device to check
+ * Return:	last reset state (enum sysreset_t) or -ve error
+ */
+int sysreset_get_last(struct udevice *dev);
+
+/**
+ * sysreset_walk() - cause a system reset
+ *
+ * This works through the available sysreset devices until it finds one that can
+ * perform a reset. If the provided sysreset type is not available, the next one
+ * will be tried.
+ *
+ * If this function fails to reset, it will display a message and halt
+ *
+ * @type:	Reset type to request
+ * Return:	-EINPROGRESS if a reset is in progress, -ENOSYS if not available
+ */
+int sysreset_walk(enum sysreset_t type);
+
+/**
+ * sysreset_get_last_walk() - get information on the last reset
+ *
+ * This works through the available sysreset devices until it finds one that can
+ * perform a reset. If the provided sysreset type is not available, the next one
+ * will be tried.
+ *
+ * If no device prives the information, this function returns -ENOENT
+ *
+ * Return:	last reset state (enum sysreset_t) or -ve error
+ */
+int sysreset_get_last_walk(void);
+
+/**
+ * sysreset_walk_halt() - try to reset, otherwise halt
+ *
+ * This calls sysreset_walk(). If it returns, indicating that reset is not
+ * supported, it prints a message and halts.
+ *
+ * @type:	Reset type to request
+ */
+void sysreset_walk_halt(enum sysreset_t type);
+
+/**
+ * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
+ */
+void reset_cpu(void);
+
+/**
+ * sysreset_register_wdt() - register a watchdog for use with sysreset
+ *
+ * This registers the given watchdog timer to be used to reset the system.
+ *
+ * @dev:	WDT device
+ * @return:	0 if OK, -errno if error
+ */
+int sysreset_register_wdt(struct udevice *dev);
+
+#endif