Commit | Line | Data |
---|---|---|
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 KG |
38 | |
39 | struct da9063_watchdog { | |
40 | struct da9063 *da9063; | |
41 | struct watchdog_device wdtdev; | |
42 | }; | |
43 | ||
44 | static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs) | |
45 | { | |
46 | unsigned int i; | |
47 | ||
48 | for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) { | |
49 | if (wdt_timeout[i] >= secs) | |
50 | return i; | |
51 | } | |
52 | ||
53 | return DA9063_TWDSCALE_MAX; | |
54 | } | |
55 | ||
56 | static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval) | |
57 | { | |
58 | return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D, | |
59 | DA9063_TWDSCALE_MASK, regval); | |
60 | } | |
61 | ||
62 | static int da9063_wdt_start(struct watchdog_device *wdd) | |
63 | { | |
64 | struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); | |
65 | unsigned int selector; | |
66 | int ret; | |
67 | ||
68 | selector = da9063_wdt_timeout_to_sel(wdt->wdtdev.timeout); | |
69 | ret = _da9063_wdt_set_timeout(wdt->da9063, selector); | |
70 | if (ret) | |
71 | dev_err(wdt->da9063->dev, "Watchdog failed to start (err = %d)\n", | |
72 | ret); | |
73 | ||
74 | return ret; | |
75 | } | |
76 | ||
77 | static int da9063_wdt_stop(struct watchdog_device *wdd) | |
78 | { | |
79 | struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); | |
80 | int ret; | |
81 | ||
82 | ret = regmap_update_bits(wdt->da9063->regmap, DA9063_REG_CONTROL_D, | |
83 | DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE); | |
84 | if (ret) | |
85 | dev_alert(wdt->da9063->dev, "Watchdog failed to stop (err = %d)\n", | |
86 | ret); | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | static int da9063_wdt_ping(struct watchdog_device *wdd) | |
92 | { | |
93 | struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); | |
94 | int ret; | |
95 | ||
96 | ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F, | |
97 | DA9063_WATCHDOG); | |
98 | if (ret) | |
99 | dev_alert(wdt->da9063->dev, "Failed to ping the watchdog (err = %d)\n", | |
100 | ret); | |
101 | ||
102 | return ret; | |
103 | } | |
104 | ||
105 | static int da9063_wdt_set_timeout(struct watchdog_device *wdd, | |
106 | unsigned int timeout) | |
107 | { | |
108 | struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); | |
109 | unsigned int selector; | |
110 | int ret; | |
111 | ||
112 | selector = da9063_wdt_timeout_to_sel(timeout); | |
113 | ret = _da9063_wdt_set_timeout(wdt->da9063, selector); | |
114 | if (ret) | |
115 | dev_err(wdt->da9063->dev, "Failed to set watchdog timeout (err = %d)\n", | |
116 | ret); | |
117 | else | |
118 | wdd->timeout = wdt_timeout[selector]; | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
4d8b229d GR |
123 | static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action, |
124 | void *data) | |
396f163c | 125 | { |
f79781ce | 126 | struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd); |
396f163c GU |
127 | int ret; |
128 | ||
129 | ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F, | |
130 | DA9063_SHUTDOWN); | |
131 | if (ret) | |
132 | dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n", | |
133 | ret); | |
134 | ||
f79781ce | 135 | return ret; |
396f163c GU |
136 | } |
137 | ||
5e9c16e3 KG |
138 | static const struct watchdog_info da9063_watchdog_info = { |
139 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, | |
140 | .identity = "DA9063 Watchdog", | |
141 | }; | |
142 | ||
143 | static const struct watchdog_ops da9063_watchdog_ops = { | |
144 | .owner = THIS_MODULE, | |
145 | .start = da9063_wdt_start, | |
146 | .stop = da9063_wdt_stop, | |
147 | .ping = da9063_wdt_ping, | |
148 | .set_timeout = da9063_wdt_set_timeout, | |
f79781ce | 149 | .restart = da9063_wdt_restart, |
5e9c16e3 KG |
150 | }; |
151 | ||
152 | static int da9063_wdt_probe(struct platform_device *pdev) | |
153 | { | |
154 | int ret; | |
155 | struct da9063 *da9063; | |
156 | struct da9063_watchdog *wdt; | |
157 | ||
158 | if (!pdev->dev.parent) | |
159 | return -EINVAL; | |
160 | ||
161 | da9063 = dev_get_drvdata(pdev->dev.parent); | |
162 | if (!da9063) | |
163 | return -EINVAL; | |
164 | ||
165 | wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); | |
166 | if (!wdt) | |
167 | return -ENOMEM; | |
168 | ||
169 | wdt->da9063 = da9063; | |
170 | ||
171 | wdt->wdtdev.info = &da9063_watchdog_info; | |
172 | wdt->wdtdev.ops = &da9063_watchdog_ops; | |
173 | wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT; | |
174 | wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT; | |
a74cab40 | 175 | wdt->wdtdev.min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS; |
5e9c16e3 | 176 | wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT; |
6551881c | 177 | wdt->wdtdev.parent = &pdev->dev; |
5e9c16e3 KG |
178 | |
179 | wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS; | |
180 | ||
f79781ce DR |
181 | watchdog_set_restart_priority(&wdt->wdtdev, 128); |
182 | ||
5e9c16e3 KG |
183 | watchdog_set_drvdata(&wdt->wdtdev, wdt); |
184 | dev_set_drvdata(&pdev->dev, wdt); | |
185 | ||
186 | ret = watchdog_register_device(&wdt->wdtdev); | |
396f163c GU |
187 | if (ret) |
188 | return ret; | |
5e9c16e3 | 189 | |
396f163c | 190 | return 0; |
5e9c16e3 KG |
191 | } |
192 | ||
193 | static int da9063_wdt_remove(struct platform_device *pdev) | |
194 | { | |
195 | struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev); | |
196 | ||
197 | watchdog_unregister_device(&wdt->wdtdev); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static struct platform_driver da9063_wdt_driver = { | |
203 | .probe = da9063_wdt_probe, | |
204 | .remove = da9063_wdt_remove, | |
205 | .driver = { | |
206 | .name = DA9063_DRVNAME_WATCHDOG, | |
207 | }, | |
208 | }; | |
209 | module_platform_driver(da9063_wdt_driver); | |
210 | ||
211 | MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>"); | |
212 | MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063"); | |
213 | MODULE_LICENSE("GPL"); | |
214 | MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG); |