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 #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 
18 int 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 
28 int 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 
47 void 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 */
58 	debug("System reset not supported on this platform\n");
59 	hang();
60 }
61 
62 /**
63  * reset_cpu() - calls sysreset_walk(SYSRESET_WARM)
64  */
65 void reset_cpu(ulong addr)
66 {
67 	sysreset_walk_halt(SYSRESET_WARM);
68 }
69 
70 
71 int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
72 {
73 	sysreset_walk_halt(SYSRESET_COLD);
74 
75 	return 0;
76 }
77 
78 UCLASS_DRIVER(sysreset) = {
79 	.id		= UCLASS_SYSRESET,
80 	.name		= "sysreset",
81 };
82