1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
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
|
