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0376148f | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f0e5bd41 FB |
2 | /* |
3 | * Copyright (C) ST-Ericsson SA 2011-2013 | |
4 | * | |
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5 | * Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson |
6 | * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson | |
7 | */ | |
8 | ||
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/moduleparam.h> | |
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14 | #include <linux/err.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/watchdog.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/platform_data/ux500_wdt.h> | |
19 | ||
20 | #include <linux/mfd/dbx500-prcmu.h> | |
21 | ||
22 | #define WATCHDOG_TIMEOUT 600 /* 10 minutes */ | |
23 | ||
24 | #define WATCHDOG_MIN 0 | |
25 | #define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */ | |
26 | #define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */ | |
27 | ||
28 | static unsigned int timeout = WATCHDOG_TIMEOUT; | |
29 | module_param(timeout, uint, 0); | |
30 | MODULE_PARM_DESC(timeout, | |
31 | "Watchdog timeout in seconds. default=" | |
32 | __MODULE_STRING(WATCHDOG_TIMEOUT) "."); | |
33 | ||
34 | static bool nowayout = WATCHDOG_NOWAYOUT; | |
35 | module_param(nowayout, bool, 0); | |
36 | MODULE_PARM_DESC(nowayout, | |
37 | "Watchdog cannot be stopped once started (default=" | |
38 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
39 | ||
40 | static int ux500_wdt_start(struct watchdog_device *wdd) | |
41 | { | |
42 | return prcmu_enable_a9wdog(PRCMU_WDOG_ALL); | |
43 | } | |
44 | ||
45 | static int ux500_wdt_stop(struct watchdog_device *wdd) | |
46 | { | |
47 | return prcmu_disable_a9wdog(PRCMU_WDOG_ALL); | |
48 | } | |
49 | ||
50 | static int ux500_wdt_keepalive(struct watchdog_device *wdd) | |
51 | { | |
52 | return prcmu_kick_a9wdog(PRCMU_WDOG_ALL); | |
53 | } | |
54 | ||
55 | static int ux500_wdt_set_timeout(struct watchdog_device *wdd, | |
56 | unsigned int timeout) | |
57 | { | |
58 | ux500_wdt_stop(wdd); | |
59 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
60 | ux500_wdt_start(wdd); | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static const struct watchdog_info ux500_wdt_info = { | |
66 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, | |
67 | .identity = "Ux500 WDT", | |
68 | .firmware_version = 1, | |
69 | }; | |
70 | ||
71 | static const struct watchdog_ops ux500_wdt_ops = { | |
72 | .owner = THIS_MODULE, | |
73 | .start = ux500_wdt_start, | |
74 | .stop = ux500_wdt_stop, | |
75 | .ping = ux500_wdt_keepalive, | |
76 | .set_timeout = ux500_wdt_set_timeout, | |
77 | }; | |
78 | ||
79 | static struct watchdog_device ux500_wdt = { | |
80 | .info = &ux500_wdt_info, | |
81 | .ops = &ux500_wdt_ops, | |
82 | .min_timeout = WATCHDOG_MIN, | |
83 | .max_timeout = WATCHDOG_MAX32, | |
84 | }; | |
85 | ||
86 | static int ux500_wdt_probe(struct platform_device *pdev) | |
87 | { | |
89e5b7ac | 88 | struct device *dev = &pdev->dev; |
f0e5bd41 | 89 | int ret; |
89e5b7ac | 90 | struct ux500_wdt_data *pdata = dev_get_platdata(dev); |
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91 | |
92 | if (pdata) { | |
93 | if (pdata->timeout > 0) | |
94 | timeout = pdata->timeout; | |
95 | if (pdata->has_28_bits_resolution) | |
96 | ux500_wdt.max_timeout = WATCHDOG_MAX28; | |
97 | } | |
98 | ||
89e5b7ac | 99 | ux500_wdt.parent = dev; |
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100 | watchdog_set_nowayout(&ux500_wdt, nowayout); |
101 | ||
102 | /* disable auto off on sleep */ | |
103 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false); | |
104 | ||
105 | /* set HW initial value */ | |
106 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
107 | ||
89e5b7ac | 108 | ret = devm_watchdog_register_device(dev, &ux500_wdt); |
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109 | if (ret) |
110 | return ret; | |
111 | ||
89e5b7ac | 112 | dev_info(dev, "initialized\n"); |
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113 | |
114 | return 0; | |
115 | } | |
116 | ||
117 | #ifdef CONFIG_PM | |
118 | static int ux500_wdt_suspend(struct platform_device *pdev, | |
119 | pm_message_t state) | |
120 | { | |
121 | if (watchdog_active(&ux500_wdt)) { | |
122 | ux500_wdt_stop(&ux500_wdt); | |
123 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true); | |
124 | ||
125 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
126 | ux500_wdt_start(&ux500_wdt); | |
127 | } | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static int ux500_wdt_resume(struct platform_device *pdev) | |
132 | { | |
133 | if (watchdog_active(&ux500_wdt)) { | |
134 | ux500_wdt_stop(&ux500_wdt); | |
135 | prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false); | |
136 | ||
137 | prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); | |
138 | ux500_wdt_start(&ux500_wdt); | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | #else | |
143 | #define ux500_wdt_suspend NULL | |
144 | #define ux500_wdt_resume NULL | |
145 | #endif | |
146 | ||
147 | static struct platform_driver ux500_wdt_driver = { | |
148 | .probe = ux500_wdt_probe, | |
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149 | .suspend = ux500_wdt_suspend, |
150 | .resume = ux500_wdt_resume, | |
151 | .driver = { | |
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152 | .name = "ux500_wdt", |
153 | }, | |
154 | }; | |
155 | ||
156 | module_platform_driver(ux500_wdt_driver); | |
157 | ||
158 | MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>"); | |
159 | MODULE_DESCRIPTION("Ux500 Watchdog Driver"); | |
160 | MODULE_LICENSE("GPL"); | |
f0e5bd41 | 161 | MODULE_ALIAS("platform:ux500_wdt"); |