2 * Copyright (C) ST-Ericsson SA 2011-2013
4 * License Terms: GNU General Public License v2
6 * Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson
7 * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/moduleparam.h>
15 #include <linux/err.h>
16 #include <linux/uaccess.h>
17 #include <linux/watchdog.h>
18 #include <linux/platform_device.h>
19 #include <linux/platform_data/ux500_wdt.h>
21 #include <linux/mfd/dbx500-prcmu.h>
23 #define WATCHDOG_TIMEOUT 600 /* 10 minutes */
25 #define WATCHDOG_MIN 0
26 #define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */
27 #define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */
29 static unsigned int timeout
= WATCHDOG_TIMEOUT
;
30 module_param(timeout
, uint
, 0);
31 MODULE_PARM_DESC(timeout
,
32 "Watchdog timeout in seconds. default="
33 __MODULE_STRING(WATCHDOG_TIMEOUT
) ".");
35 static bool nowayout
= WATCHDOG_NOWAYOUT
;
36 module_param(nowayout
, bool, 0);
37 MODULE_PARM_DESC(nowayout
,
38 "Watchdog cannot be stopped once started (default="
39 __MODULE_STRING(WATCHDOG_NOWAYOUT
) ")");
41 static int ux500_wdt_start(struct watchdog_device
*wdd
)
43 return prcmu_enable_a9wdog(PRCMU_WDOG_ALL
);
46 static int ux500_wdt_stop(struct watchdog_device
*wdd
)
48 return prcmu_disable_a9wdog(PRCMU_WDOG_ALL
);
51 static int ux500_wdt_keepalive(struct watchdog_device
*wdd
)
53 return prcmu_kick_a9wdog(PRCMU_WDOG_ALL
);
56 static int ux500_wdt_set_timeout(struct watchdog_device
*wdd
,
60 prcmu_load_a9wdog(PRCMU_WDOG_ALL
, timeout
* 1000);
66 static const struct watchdog_info ux500_wdt_info
= {
67 .options
= WDIOF_SETTIMEOUT
| WDIOF_KEEPALIVEPING
| WDIOF_MAGICCLOSE
,
68 .identity
= "Ux500 WDT",
69 .firmware_version
= 1,
72 static const struct watchdog_ops ux500_wdt_ops
= {
74 .start
= ux500_wdt_start
,
75 .stop
= ux500_wdt_stop
,
76 .ping
= ux500_wdt_keepalive
,
77 .set_timeout
= ux500_wdt_set_timeout
,
80 static struct watchdog_device ux500_wdt
= {
81 .info
= &ux500_wdt_info
,
82 .ops
= &ux500_wdt_ops
,
83 .min_timeout
= WATCHDOG_MIN
,
84 .max_timeout
= WATCHDOG_MAX32
,
87 static int ux500_wdt_probe(struct platform_device
*pdev
)
90 struct ux500_wdt_data
*pdata
= dev_get_platdata(&pdev
->dev
);
93 if (pdata
->timeout
> 0)
94 timeout
= pdata
->timeout
;
95 if (pdata
->has_28_bits_resolution
)
96 ux500_wdt
.max_timeout
= WATCHDOG_MAX28
;
99 ux500_wdt
.parent
= &pdev
->dev
;
100 watchdog_set_nowayout(&ux500_wdt
, nowayout
);
102 /* disable auto off on sleep */
103 prcmu_config_a9wdog(PRCMU_WDOG_CPU1
, false);
105 /* set HW initial value */
106 prcmu_load_a9wdog(PRCMU_WDOG_ALL
, timeout
* 1000);
108 ret
= watchdog_register_device(&ux500_wdt
);
112 dev_info(&pdev
->dev
, "initialized\n");
117 static int ux500_wdt_remove(struct platform_device
*dev
)
119 watchdog_unregister_device(&ux500_wdt
);
125 static int ux500_wdt_suspend(struct platform_device
*pdev
,
128 if (watchdog_active(&ux500_wdt
)) {
129 ux500_wdt_stop(&ux500_wdt
);
130 prcmu_config_a9wdog(PRCMU_WDOG_CPU1
, true);
132 prcmu_load_a9wdog(PRCMU_WDOG_ALL
, timeout
* 1000);
133 ux500_wdt_start(&ux500_wdt
);
138 static int ux500_wdt_resume(struct platform_device
*pdev
)
140 if (watchdog_active(&ux500_wdt
)) {
141 ux500_wdt_stop(&ux500_wdt
);
142 prcmu_config_a9wdog(PRCMU_WDOG_CPU1
, false);
144 prcmu_load_a9wdog(PRCMU_WDOG_ALL
, timeout
* 1000);
145 ux500_wdt_start(&ux500_wdt
);
150 #define ux500_wdt_suspend NULL
151 #define ux500_wdt_resume NULL
154 static struct platform_driver ux500_wdt_driver
= {
155 .probe
= ux500_wdt_probe
,
156 .remove
= ux500_wdt_remove
,
157 .suspend
= ux500_wdt_suspend
,
158 .resume
= ux500_wdt_resume
,
164 module_platform_driver(ux500_wdt_driver
);
166 MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
167 MODULE_DESCRIPTION("Ux500 Watchdog Driver");
168 MODULE_LICENSE("GPL");
169 MODULE_ALIAS("platform:ux500_wdt");