1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
*
* Derived from linux/drivers/power/reset/syscon-reboot.c:
* Copyright (C) 2013, Applied Micro Circuits Corporation
* Author: Feng Kan <fkan@apm.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <regmap.h>
#include <sysreset.h>
#include <syscon.h>
DECLARE_GLOBAL_DATA_PTR;
struct syscon_reboot_priv {
struct regmap *regmap;
unsigned int offset;
unsigned int mask;
};
static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
{
struct syscon_reboot_priv *priv = dev_get_priv(dev);
regmap_write(priv->regmap, priv->offset, priv->mask);
return -EINPROGRESS;
}
static struct sysreset_ops syscon_reboot_ops = {
.request = syscon_reboot_request,
};
int syscon_reboot_probe(struct udevice *dev)
{
struct udevice *syscon;
struct syscon_reboot_priv *priv = dev_get_priv(dev);
int err;
err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
"regmap", &syscon);
if (err) {
error("unable to find syscon device\n");
return err;
}
priv->regmap = syscon_get_regmap(syscon);
if (!priv->regmap) {
error("unable to find regmap\n");
return -ENODEV;
}
priv->offset = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
"offset", 0);
priv->mask = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
"mask", 0);
return 0;
}
static const struct udevice_id syscon_reboot_ids[] = {
{ .compatible = "syscon-reboot" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(syscon_reboot) = {
.name = "syscon_reboot",
.id = UCLASS_SYSRESET,
.of_match = syscon_reboot_ids,
.probe = syscon_reboot_probe,
.priv_auto_alloc_size = sizeof(struct syscon_reboot_priv),
.ops = &syscon_reboot_ops,
};
|
