blob: 81318bdbf5d3a2fb25f49be67335201bbb56b047 [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -04001/* SPDX-License-Identifier: GPL-2.0+ */
Stephen Warren11636252016-05-12 12:03:35 -06002/*
3 * Copyright (c) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
Stephen Warren11636252016-05-12 12:03:35 -06005 */
6
7#ifndef __SYSRESET_H
8#define __SYSRESET_H
9
10enum sysreset_t {
11 SYSRESET_WARM, /* Reset CPU, keep GPIOs active */
12 SYSRESET_COLD, /* Reset CPU and GPIOs */
13 SYSRESET_POWER, /* Reset PMIC (remove and restore power) */
14
15 SYSRESET_COUNT,
16};
17
18struct sysreset_ops {
19 /**
20 * request() - request a sysreset of the given type
21 *
22 * Note that this function may return before the reset takes effect.
23 *
24 * @type: Reset type to request
25 * @return -EINPROGRESS if the reset has been started and
26 * will complete soon, -EPROTONOSUPPORT if not supported
27 * by this device, 0 if the reset has already happened
28 * (in which case this method will not actually return)
29 */
30 int (*request)(struct udevice *dev, enum sysreset_t type);
31};
32
33#define sysreset_get_ops(dev) ((struct sysreset_ops *)(dev)->driver->ops)
34
35/**
36 * sysreset_request() - request a sysreset
37 *
38 * @type: Reset type to request
39 * @return 0 if OK, -EPROTONOSUPPORT if not supported by this device
40 */
41int sysreset_request(struct udevice *dev, enum sysreset_t type);
42
43/**
44 * sysreset_walk() - cause a system reset
45 *
46 * This works through the available sysreset devices until it finds one that can
47 * perform a reset. If the provided sysreset type is not available, the next one
48 * will be tried.
49 *
50 * If this function fails to reset, it will display a message and halt
51 *
52 * @type: Reset type to request
53 * @return -EINPROGRESS if a reset is in progress, -ENOSYS if not available
54 */
55int sysreset_walk(enum sysreset_t type);
56
57/**
58 * sysreset_walk_halt() - try to reset, otherwise halt
59 *
60 * This calls sysreset_walk(). If it returns, indicating that reset is not
61 * supported, it prints a message and halts.
62 */
63void sysreset_walk_halt(enum sysreset_t type);
64
65/**
66 * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
67 */
68void reset_cpu(ulong addr);
69
70#endif