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