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
|
/*
* Watchdog driver for Technologic Systems TS-72xx based SBCs
* (TS-7200, TS-7250 and TS-7260). These boards have external
* glue logic CPLD chip, which includes programmable watchdog
* timer.
*
* Copyright (c) 2009 Mika Westerberg <mika.westerberg@iki.fi>
*
* This driver is based on ep93xx_wdt and wm831x_wdt drivers.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/watchdog.h>
#include <linux/io.h>
#define TS72XX_WDT_DEFAULT_TIMEOUT 30
static int timeout;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds.");
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
/* priv->control_reg */
#define TS72XX_WDT_CTRL_DISABLE 0x00
#define TS72XX_WDT_CTRL_250MS 0x01
#define TS72XX_WDT_CTRL_500MS 0x02
#define TS72XX_WDT_CTRL_1SEC 0x03
#define TS72XX_WDT_CTRL_RESERVED 0x04
#define TS72XX_WDT_CTRL_2SEC 0x05
#define TS72XX_WDT_CTRL_4SEC 0x06
#define TS72XX_WDT_CTRL_8SEC 0x07
/* priv->feed_reg */
#define TS72XX_WDT_FEED_VAL 0x05
struct ts72xx_wdt_priv {
void __iomem *control_reg;
void __iomem *feed_reg;
struct watchdog_device wdd;
unsigned char regval;
};
static int ts72xx_wdt_start(struct watchdog_device *wdd)
{
struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
writeb(priv->regval, priv->control_reg);
return 0;
}
static int ts72xx_wdt_stop(struct watchdog_device *wdd)
{
struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
writeb(TS72XX_WDT_CTRL_DISABLE, priv->control_reg);
return 0;
}
static int ts72xx_wdt_ping(struct watchdog_device *wdd)
{
struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
return 0;
}
static int ts72xx_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
{
struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
if (to == 1) {
priv->regval = TS72XX_WDT_CTRL_1SEC;
} else if (to == 2) {
priv->regval = TS72XX_WDT_CTRL_2SEC;
} else if (to <= 4) {
priv->regval = TS72XX_WDT_CTRL_4SEC;
to = 4;
} else {
priv->regval = TS72XX_WDT_CTRL_8SEC;
if (to <= 8)
to = 8;
}
wdd->timeout = to;
if (watchdog_active(wdd)) {
ts72xx_wdt_stop(wdd);
ts72xx_wdt_start(wdd);
}
return 0;
}
static const struct watchdog_info ts72xx_wdt_ident = {
.options = WDIOF_KEEPALIVEPING |
WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE,
.firmware_version = 1,
.identity = "TS-72XX WDT",
};
static const struct watchdog_ops ts72xx_wdt_ops = {
.owner = THIS_MODULE,
.start = ts72xx_wdt_start,
.stop = ts72xx_wdt_stop,
.ping = ts72xx_wdt_ping,
.set_timeout = ts72xx_wdt_settimeout,
};
static int ts72xx_wdt_probe(struct platform_device *pdev)
{
struct ts72xx_wdt_priv *priv;
struct watchdog_device *wdd;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->control_reg = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->control_reg))
return PTR_ERR(priv->control_reg);
priv->feed_reg = devm_platform_ioremap_resource(pdev, 1);
if (IS_ERR(priv->feed_reg))
return PTR_ERR(priv->feed_reg);
wdd = &priv->wdd;
wdd->info = &ts72xx_wdt_ident;
wdd->ops = &ts72xx_wdt_ops;
wdd->min_timeout = 1;
wdd->max_hw_heartbeat_ms = 8000;
wdd->parent = &pdev->dev;
watchdog_set_nowayout(wdd, nowayout);
wdd->timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
watchdog_init_timeout(wdd, timeout, &pdev->dev);
watchdog_set_drvdata(wdd, priv);
ret = devm_watchdog_register_device(&pdev->dev, wdd);
if (ret)
return ret;
dev_info(&pdev->dev, "TS-72xx Watchdog driver\n");
return 0;
}
static struct platform_driver ts72xx_wdt_driver = {
.probe = ts72xx_wdt_probe,
.driver = {
.name = "ts72xx-wdt",
},
};
module_platform_driver(ts72xx_wdt_driver);
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>");
MODULE_DESCRIPTION("TS-72xx SBC Watchdog");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ts72xx-wdt");
|
