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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Renesas R-Mobile Reset Driver
*
* Copyright (C) 2014 Glider bvba
*/
#include <linux/io.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/reboot.h>
/* SYSC Register Bank 2 */
#define RESCNT2 0x20 /* Reset Control Register 2 */
/* Reset Control Register 2 */
#define RESCNT2_PRES 0x80000000 /* Soft power-on reset */
static int rmobile_reset_handler(struct sys_off_data *data)
{
void __iomem *sysc_base2 = (void __iomem *)data->cb_data;
/* Let's assume we have acquired the HPB semaphore */
writel(RESCNT2_PRES, sysc_base2 + RESCNT2);
return NOTIFY_DONE;
}
static int rmobile_reset_probe(struct platform_device *pdev)
{
void __iomem *sysc_base2;
int error;
sysc_base2 = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(sysc_base2))
return PTR_ERR(sysc_base2);
error = devm_register_sys_off_handler(&pdev->dev,
SYS_OFF_MODE_RESTART,
SYS_OFF_PRIO_HIGH,
rmobile_reset_handler,
(__force void *)sysc_base2);
if (error) {
dev_err(&pdev->dev,
"cannot register restart handler (err=%d)\n", error);
return error;
}
return 0;
}
static const struct of_device_id rmobile_reset_of_match[] = {
{ .compatible = "renesas,sysc-rmobile", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, rmobile_reset_of_match);
static struct platform_driver rmobile_reset_driver = {
.probe = rmobile_reset_probe,
.driver = {
.name = "rmobile_reset",
.of_match_table = rmobile_reset_of_match,
},
};
module_platform_driver(rmobile_reset_driver);
MODULE_DESCRIPTION("Renesas R-Mobile Reset Driver");
MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
MODULE_LICENSE("GPL v2");
|
