1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7 #include <common.h>
8 #include <sysreset.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <regmap.h>
12 #include <dm/device-internal.h>
13 #include <dm/lists.h>
14 #include <dm/root.h>
15 #include <linux/err.h>
16
sysreset_request(struct udevice * dev,enum sysreset_t type)17 int sysreset_request(struct udevice *dev, enum sysreset_t type)
18 {
19 struct sysreset_ops *ops = sysreset_get_ops(dev);
20
21 if (!ops->request)
22 return -ENOSYS;
23
24 return ops->request(dev, type);
25 }
26
sysreset_walk(enum sysreset_t type)27 int sysreset_walk(enum sysreset_t type)
28 {
29 struct udevice *dev;
30 int ret = -ENOSYS;
31
32 while (ret != -EINPROGRESS && type < SYSRESET_COUNT) {
33 for (uclass_first_device(UCLASS_SYSRESET, &dev);
34 dev;
35 uclass_next_device(&dev)) {
36 ret = sysreset_request(dev, type);
37 if (ret == -EINPROGRESS)
38 break;
39 }
40 type++;
41 }
42
43 return ret;
44 }
45
sysreset_walk_halt(enum sysreset_t type)46 void sysreset_walk_halt(enum sysreset_t type)
47 {
48 int ret;
49
50 ret = sysreset_walk(type);
51
52 /* Wait for the reset to take effect */
53 if (ret == -EINPROGRESS)
54 mdelay(100);
55
56 /* Still no reset? Give up */
57 debug("System reset not supported on this platform\n");
58 hang();
59 }
60
61 /**
62 * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
63 */
reset_cpu(ulong addr)64 void reset_cpu(ulong addr)
65 {
66 sysreset_walk_halt(SYSRESET_WARM);
67 }
68
69
do_reset(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])70 int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
71 {
72 sysreset_walk_halt(SYSRESET_COLD);
73
74 return 0;
75 }
76
77 UCLASS_DRIVER(sysreset) = {
78 .id = UCLASS_SYSRESET,
79 .name = "sysreset",
80 };
81