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5e9c16e3 KG |
1 | /* |
2 | * Watchdog driver for DA9063 PMICs. | |
3 | * | |
4 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
5 | * | |
6 | * Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/watchdog.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/mfd/da9063/registers.h> | |
22 | #include <linux/mfd/da9063/core.h> | |
23 | #include <linux/regmap.h> | |
24 | ||
25 | /* | |
26 | * Watchdog selector to timeout in seconds. | |
27 | * 0: WDT disabled; | |
28 | * others: timeout = 2048 ms * 2^(TWDSCALE-1). | |
29 | */ | |
30 | static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 }; | |
31 | #define DA9063_TWDSCALE_DISABLE 0 | |
32 | #define DA9063_TWDSCALE_MIN 1 | |
33 | #define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1) | |
34 | #define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN] | |
35 | #define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX] | |
36 | #define DA9063_WDG_TIMEOUT wdt_timeout[3] | |
a74cab40 | 37 | #define DA9063_RESET_PROTECTION_MS 256 |
5e9c16e3 | 38 | |
5e9c16e3 KG |
39 | static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs) |
40 | { | |
41 | unsigned int i; | |
42 | ||
43 | for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) { | |
44 | if (wdt_timeout[i] >= secs) | |
45 | return i; | |
46 | } | |
47 | ||
48 | return DA9063_TWDSCALE_MAX; | |
49 | } | |
50 | ||
51 | static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval) | |
52 | { | |
53 | return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D, | |
54 | DA9063_TWDSCALE_MASK, regval); | |
55 | } | |
56 | ||
57 | static int da9063_wdt_start(struct watchdog_device *wdd) | |
58 | { | |
a1f2a820 | 59 | struct da9063 *da9063 = watchdog_get_drvdata(wdd); |
5e9c16e3 KG |
60 | unsigned int selector; |
61 | int ret; | |
62 | ||
a1f2a820 | 63 | selector = da9063_wdt_timeout_to_sel(wdd->timeout); |
64 | ret = _da9063_wdt_set_timeout(da9063, selector); | |
5e9c16e3 | 65 | if (ret) |
a1f2a820 | 66 | dev_err(da9063->dev, "Watchdog failed to start (err = %d)\n", |
5e9c16e3 KG |
67 | ret); |
68 | ||
69 | return ret; | |
70 | } | |
71 | ||
72 | static int da9063_wdt_stop(struct watchdog_device *wdd) | |
73 | { | |
a1f2a820 | 74 | struct da9063 *da9063 = watchdog_get_drvdata(wdd); |
5e9c16e3 KG |
75 | int ret; |
76 | ||
a1f2a820 | 77 | ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D, |
5e9c16e3 KG |
78 | DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE); |
79 | if (ret) | |
a1f2a820 | 80 | dev_alert(da9063->dev, "Watchdog failed to stop (err = %d)\n", |
5e9c16e3 KG |
81 | ret); |
82 | ||
83 | return ret; | |
84 | } | |
85 | ||
86 | static int da9063_wdt_ping(struct watchdog_device *wdd) | |
87 | { | |
a1f2a820 | 88 | struct da9063 *da9063 = watchdog_get_drvdata(wdd); |
5e9c16e3 KG |
89 | int ret; |
90 | ||
a1f2a820 | 91 | ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F, |
5e9c16e3 KG |
92 | DA9063_WATCHDOG); |
93 | if (ret) | |
a1f2a820 | 94 | dev_alert(da9063->dev, "Failed to ping the watchdog (err = %d)\n", |
5e9c16e3 KG |
95 | ret); |
96 | ||
97 | return ret; | |
98 | } | |
99 | ||
100 | static int da9063_wdt_set_timeout(struct watchdog_device *wdd, | |
101 | unsigned int timeout) | |
102 | { | |
a1f2a820 | 103 | struct da9063 *da9063 = watchdog_get_drvdata(wdd); |
5e9c16e3 KG |
104 | unsigned int selector; |
105 | int ret; | |
106 | ||
107 | selector = da9063_wdt_timeout_to_sel(timeout); | |
a1f2a820 | 108 | ret = _da9063_wdt_set_timeout(da9063, selector); |
5e9c16e3 | 109 | if (ret) |
a1f2a820 | 110 | dev_err(da9063->dev, "Failed to set watchdog timeout (err = %d)\n", |
5e9c16e3 KG |
111 | ret); |
112 | else | |
113 | wdd->timeout = wdt_timeout[selector]; | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
4d8b229d GR |
118 | static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action, |
119 | void *data) | |
396f163c | 120 | { |
a1f2a820 | 121 | struct da9063 *da9063 = watchdog_get_drvdata(wdd); |
396f163c GU |
122 | int ret; |
123 | ||
a1f2a820 | 124 | ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F, |
396f163c GU |
125 | DA9063_SHUTDOWN); |
126 | if (ret) | |
a1f2a820 | 127 | dev_alert(da9063->dev, "Failed to shutdown (err = %d)\n", |
396f163c GU |
128 | ret); |
129 | ||
f79781ce | 130 | return ret; |
396f163c GU |
131 | } |
132 | ||
5e9c16e3 KG |
133 | static const struct watchdog_info da9063_watchdog_info = { |
134 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, | |
135 | .identity = "DA9063 Watchdog", | |
136 | }; | |
137 | ||
138 | static const struct watchdog_ops da9063_watchdog_ops = { | |
139 | .owner = THIS_MODULE, | |
140 | .start = da9063_wdt_start, | |
141 | .stop = da9063_wdt_stop, | |
142 | .ping = da9063_wdt_ping, | |
143 | .set_timeout = da9063_wdt_set_timeout, | |
f79781ce | 144 | .restart = da9063_wdt_restart, |
5e9c16e3 KG |
145 | }; |
146 | ||
147 | static int da9063_wdt_probe(struct platform_device *pdev) | |
148 | { | |
5e9c16e3 | 149 | struct da9063 *da9063; |
a1f2a820 | 150 | struct watchdog_device *wdd; |
5e9c16e3 KG |
151 | |
152 | if (!pdev->dev.parent) | |
153 | return -EINVAL; | |
154 | ||
155 | da9063 = dev_get_drvdata(pdev->dev.parent); | |
156 | if (!da9063) | |
157 | return -EINVAL; | |
158 | ||
a1f2a820 | 159 | wdd = devm_kzalloc(&pdev->dev, sizeof(*wdd), GFP_KERNEL); |
160 | if (!wdd) | |
5e9c16e3 KG |
161 | return -ENOMEM; |
162 | ||
a1f2a820 | 163 | wdd->info = &da9063_watchdog_info; |
164 | wdd->ops = &da9063_watchdog_ops; | |
165 | wdd->min_timeout = DA9063_WDT_MIN_TIMEOUT; | |
166 | wdd->max_timeout = DA9063_WDT_MAX_TIMEOUT; | |
167 | wdd->min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS; | |
168 | wdd->timeout = DA9063_WDG_TIMEOUT; | |
169 | wdd->parent = &pdev->dev; | |
5e9c16e3 | 170 | |
a1f2a820 | 171 | wdd->status = WATCHDOG_NOWAYOUT_INIT_STATUS; |
5e9c16e3 | 172 | |
a1f2a820 | 173 | watchdog_set_restart_priority(wdd, 128); |
f79781ce | 174 | |
a1f2a820 | 175 | watchdog_set_drvdata(wdd, da9063); |
5e9c16e3 | 176 | |
a1f2a820 | 177 | return devm_watchdog_register_device(&pdev->dev, wdd); |
5e9c16e3 KG |
178 | } |
179 | ||
180 | static struct platform_driver da9063_wdt_driver = { | |
181 | .probe = da9063_wdt_probe, | |
5e9c16e3 KG |
182 | .driver = { |
183 | .name = DA9063_DRVNAME_WATCHDOG, | |
184 | }, | |
185 | }; | |
186 | module_platform_driver(da9063_wdt_driver); | |
187 | ||
188 | MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>"); | |
189 | MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063"); | |
190 | MODULE_LICENSE("GPL"); | |
191 | MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG); |