mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 01:38:22 +00:00
a8f63d18bb
Add an option to automatically register watchdog devices with the wdt_reboot driver for use with sysreset. This allows sysreset to be a drop-in replacement for platform-specific watchdog reset code, without needing any device tree changes. Signed-off-by: Samuel Holland <samuel@sholland.org> Reviewed-by: Stefan Roese <sr@denx.de>
146 lines
4 KiB
C
146 lines
4 KiB
C
/* 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
|