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1 /*
2 * Copyright (c) 2015 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8 #ifndef __RESET_H
9 #define __RESET_H
10
11 enum reset_t {
12 RESET_WARM, /* Reset CPU, keep GPIOs active */
13 RESET_COLD, /* Reset CPU and GPIOs */
14 RESET_POWER, /* Reset PMIC (remove and restore power) */
15
16 RESET_COUNT,
17 };
18
19 struct reset_ops {
20 /**
21 * request() - request a reset of the given type
22 *
23 * Note that this function may return before the reset takes effect.
24 *
25 * @type: Reset type to request
26 * @return -EINPROGRESS if the reset has been started and
27 * will complete soon, -EPROTONOSUPPORT if not supported
28 * by this device, 0 if the reset has already happened
29 * (in which case this method will not actually return)
30 */
31 int (*request)(struct udevice *dev, enum reset_t type);
32 };
33
34 #define reset_get_ops(dev) ((struct reset_ops *)(dev)->driver->ops)
35
36 /**
37 * reset_request() - request a reset
38 *
39 * @type: Reset type to request
40 * @return 0 if OK, -EPROTONOSUPPORT if not supported by this device
41 */
42 int reset_request(struct udevice *dev, enum reset_t type);
43
44 /**
45 * reset_walk() - cause a reset
46 *
47 * This works through the available reset devices until it finds one that can
48 * perform a reset. If the provided reset type is not available, the next one
49 * will be tried.
50 *
51 * If this function fails to reset, it will display a message and halt
52 *
53 * @type: Reset type to request
54 * @return -EINPROGRESS if a reset is in progress, -ENOSYS if not available
55 */
56 int reset_walk(enum reset_t type);
57
58 /**
59 * reset_walk_halt() - try to reset, otherwise halt
60 *
61 * This calls reset_walk(). If it returns, indicating that reset is not
62 * supported, it prints a message and halts.
63 */
64 void reset_walk_halt(enum reset_t type);
65
66 /**
67 * reset_cpu() - calls reset_walk(RESET_WARM)
68 */
69 void reset_cpu(ulong addr);
70
71 #endif