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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
* Watchdog driver for DA9063 PMICs.
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
/*
* Watchdog selector to timeout in seconds.
* 0: WDT disabled;
* others: timeout = 2048 ms * 2^(TWDSCALE-1).
*/
static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
#define DA9063_TWDSCALE_DISABLE 0
#define DA9063_TWDSCALE_MIN 1
#define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
#define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN]
#define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX]
#define DA9063_WDG_TIMEOUT wdt_timeout[3]
struct da9063_watchdog {
struct da9063 *da9063;
struct watchdog_device wdtdev;
struct notifier_block restart_handler;
};
static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
{
unsigned int i;
for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) {
if (wdt_timeout[i] >= secs)
return i;
}
return DA9063_TWDSCALE_MAX;
}
static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval)
{
return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
DA9063_TWDSCALE_MASK, regval);
}
static int da9063_wdt_start(struct watchdog_device *wdd)
{
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
unsigned int selector;
int ret;
selector = da9063_wdt_timeout_to_sel(wdt->wdtdev.timeout);
ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
if (ret)
dev_err(wdt->da9063->dev, "Watchdog failed to start (err = %d)\n",
ret);
return ret;
}
static int da9063_wdt_stop(struct watchdog_device *wdd)
{
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
int ret;
ret = regmap_update_bits(wdt->da9063->regmap, DA9063_REG_CONTROL_D,
DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE);
if (ret)
dev_alert(wdt->da9063->dev, "Watchdog failed to stop (err = %d)\n",
ret);
return ret;
}
static int da9063_wdt_ping(struct watchdog_device *wdd)
{
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
int ret;
ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
DA9063_WATCHDOG);
if (ret)
dev_alert(wdt->da9063->dev, "Failed to ping the watchdog (err = %d)\n",
ret);
return ret;
}
static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
unsigned int timeout)
{
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
unsigned int selector;
int ret;
selector = da9063_wdt_timeout_to_sel(timeout);
ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
if (ret)
dev_err(wdt->da9063->dev, "Failed to set watchdog timeout (err = %d)\n",
ret);
else
wdd->timeout = wdt_timeout[selector];
return ret;
}
static int da9063_wdt_restart_handler(struct notifier_block *this,
unsigned long mode, void *cmd)
{
struct da9063_watchdog *wdt = container_of(this,
struct da9063_watchdog,
restart_handler);
int ret;
ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
DA9063_SHUTDOWN);
if (ret)
dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n",
ret);
return NOTIFY_DONE;
}
static const struct watchdog_info da9063_watchdog_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
.identity = "DA9063 Watchdog",
};
static const struct watchdog_ops da9063_watchdog_ops = {
.owner = THIS_MODULE,
.start = da9063_wdt_start,
.stop = da9063_wdt_stop,
.ping = da9063_wdt_ping,
.set_timeout = da9063_wdt_set_timeout,
};
static int da9063_wdt_probe(struct platform_device *pdev)
{
int ret;
struct da9063 *da9063;
struct da9063_watchdog *wdt;
if (!pdev->dev.parent)
return -EINVAL;
da9063 = dev_get_drvdata(pdev->dev.parent);
if (!da9063)
return -EINVAL;
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
wdt->da9063 = da9063;
wdt->wdtdev.info = &da9063_watchdog_info;
wdt->wdtdev.ops = &da9063_watchdog_ops;
wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT;
wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT;
wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT;
wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
watchdog_set_drvdata(&wdt->wdtdev, wdt);
dev_set_drvdata(&pdev->dev, wdt);
ret = watchdog_register_device(&wdt->wdtdev);
if (ret)
return ret;
wdt->restart_handler.notifier_call = da9063_wdt_restart_handler;
wdt->restart_handler.priority = 128;
ret = register_restart_handler(&wdt->restart_handler);
if (ret)
dev_err(wdt->da9063->dev,
"Failed to register restart handler (err = %d)\n", ret);
return 0;
}
static int da9063_wdt_remove(struct platform_device *pdev)
{
struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev);
unregister_restart_handler(&wdt->restart_handler);
watchdog_unregister_device(&wdt->wdtdev);
return 0;
}
static struct platform_driver da9063_wdt_driver = {
.probe = da9063_wdt_probe,
.remove = da9063_wdt_remove,
.driver = {
.name = DA9063_DRVNAME_WATCHDOG,
},
};
module_platform_driver(da9063_wdt_driver);
MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>");
MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);
|
