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/* 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 {
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(void);
#endif
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