blob: 0747c52b607794fef9b4e2de4bc2e0d33dd319c2 [file] [log] [blame]
Stephen Warren11636252016-05-12 12:03:35 -06001/*
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#include <common.h>
9#include <sysreset.h>
10#include <dm.h>
11#include <errno.h>
12#include <regmap.h>
13#include <dm/device-internal.h>
14#include <dm/lists.h>
15#include <dm/root.h>
16#include <linux/err.h>
17
18int sysreset_request(struct udevice *dev, enum sysreset_t type)
19{
20 struct sysreset_ops *ops = sysreset_get_ops(dev);
21
22 if (!ops->request)
23 return -ENOSYS;
24
25 return ops->request(dev, type);
26}
27
28int sysreset_walk(enum sysreset_t type)
29{
30 struct udevice *dev;
31 int ret = -ENOSYS;
32
33 while (ret != -EINPROGRESS && type < SYSRESET_COUNT) {
34 for (uclass_first_device(UCLASS_SYSRESET, &dev);
35 dev;
36 uclass_next_device(&dev)) {
37 ret = sysreset_request(dev, type);
38 if (ret == -EINPROGRESS)
39 break;
40 }
41 type++;
42 }
43
44 return ret;
45}
46
47void sysreset_walk_halt(enum sysreset_t type)
48{
49 int ret;
50
51 ret = sysreset_walk(type);
52
53 /* Wait for the reset to take effect */
54 if (ret == -EINPROGRESS)
55 mdelay(100);
56
57 /* Still no reset? Give up */
Simon Glass5c086212016-05-14 14:02:54 -060058 debug("System reset not supported on this platform\n");
Stephen Warren11636252016-05-12 12:03:35 -060059 hang();
60}
61
62/**
63 * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
64 */
65void reset_cpu(ulong addr)
66{
67 sysreset_walk_halt(SYSRESET_WARM);
68}
69
70
71int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
72{
Philipp Tomsichb53f69922017-11-24 18:37:58 +010073 sysreset_walk_halt(SYSRESET_COLD);
Stephen Warren11636252016-05-12 12:03:35 -060074
75 return 0;
76}
77
78UCLASS_DRIVER(sysreset) = {
79 .id = UCLASS_SYSRESET,
80 .name = "sysreset",
81};