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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Generic Syscon Poweroff Driver
*
* Copyright (c) 2015, National Instruments Corp.
* Author: Moritz Fischer <moritz.fischer@ettus.com>
*/
#include <common.h>
#include <init.h>
#include <poweroff.h>
#include <mfd/syscon.h>
static struct regmap *map;
static u32 offset;
static u32 value;
static u32 mask;
static void syscon_poweroff(struct poweroff_handler *handler)
{
/* Issue the poweroff */
regmap_update_bits(map, offset, mask, value);
mdelay(1000);
pr_emerg("Unable to poweroff system\n");
}
static int syscon_poweroff_probe(struct device_d *dev)
{
int mask_err, value_err;
map = syscon_regmap_lookup_by_phandle(dev->device_node, "regmap");
if (IS_ERR(map)) {
dev_err(dev, "unable to get syscon");
return PTR_ERR(map);
}
if (of_property_read_u32(dev->device_node, "offset", &offset)) {
dev_err(dev, "unable to read 'offset'");
return -EINVAL;
}
value_err = of_property_read_u32(dev->device_node, "value", &value);
mask_err = of_property_read_u32(dev->device_node, "mask", &mask);
if (value_err && mask_err) {
dev_err(dev, "unable to read 'value' and 'mask'");
return -EINVAL;
}
if (value_err) {
/* support old binding */
value = mask;
mask = 0xFFFFFFFF;
} else if (mask_err) {
/* support value without mask*/
mask = 0xFFFFFFFF;
}
poweroff_handler_register_fn(syscon_poweroff);
return 0;
}
static const struct of_device_id syscon_poweroff_of_match[] = {
{ .compatible = "syscon-poweroff" },
{}
};
static struct driver_d syscon_poweroff_driver = {
.name = "syscon-poweroff",
.of_compatible = syscon_poweroff_of_match,
.probe = syscon_poweroff_probe,
};
coredevice_platform_driver(syscon_poweroff_driver);
|
