1 files changed, 119 insertions, 0 deletions
diff --git a/include/sysreset.h b/include/sysreset.h
new file mode 100644
index 0000000..61295e3
--- /dev/null
+++ b/include/sysreset.h
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef __SYSRESET_H
+#define __SYSRESET_H
+
+enum sysreset_t {
+	SYSRESET_WARM,	/* Reset CPU, keep GPIOs active */
+	SYSRESET_COLD,	/* Reset CPU and GPIOs */
+	SYSRESET_POWER,	/* Reset PMIC (remove and restore power) */
+	SYSRESET_POWER_OFF,	/* Turn off power */
+
+	SYSRESET_COUNT,
+};
+
+struct sysreset_ops {
+	/**
+	 * request() - request a sysreset of the given type
+	 *
+	 * Note that this function may return before the reset takes effect.
+	 *
+	 * @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 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
+ *
+ * @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.
+ */
+void sysreset_walk_halt(enum sysreset_t type);
+
+/**
+ * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
+ */
+void reset_cpu(ulong addr);
+
+#endif