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2e62c498 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
7a7cb009 | 2 | /* |
72106c18 | 3 | * Watchdog device driver for DA9062 and DA9061 PMICs |
7a7cb009 T |
4 | * Copyright (C) 2015 Dialog Semiconductor Ltd. |
5 | * | |
7a7cb009 T |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/watchdog.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/uaccess.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/jiffies.h> | |
16 | #include <linux/mfd/da9062/registers.h> | |
17 | #include <linux/mfd/da9062/core.h> | |
18 | #include <linux/regmap.h> | |
19 | #include <linux/of.h> | |
20 | ||
21 | static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 }; | |
22 | #define DA9062_TWDSCALE_DISABLE 0 | |
23 | #define DA9062_TWDSCALE_MIN 1 | |
24 | #define DA9062_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1) | |
25 | #define DA9062_WDT_MIN_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MIN] | |
26 | #define DA9062_WDT_MAX_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MAX] | |
27 | #define DA9062_WDG_DEFAULT_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MAX-1] | |
28 | #define DA9062_RESET_PROTECTION_MS 300 | |
29 | ||
30 | struct da9062_watchdog { | |
31 | struct da9062 *hw; | |
32 | struct watchdog_device wdtdev; | |
7a7cb009 T |
33 | }; |
34 | ||
7a7cb009 T |
35 | static unsigned int da9062_wdt_timeout_to_sel(unsigned int secs) |
36 | { | |
37 | unsigned int i; | |
38 | ||
39 | for (i = DA9062_TWDSCALE_MIN; i <= DA9062_TWDSCALE_MAX; i++) { | |
40 | if (wdt_timeout[i] >= secs) | |
41 | return i; | |
42 | } | |
43 | ||
44 | return DA9062_TWDSCALE_MAX; | |
45 | } | |
46 | ||
47 | static int da9062_reset_watchdog_timer(struct da9062_watchdog *wdt) | |
48 | { | |
6e8a7c75 GR |
49 | return regmap_update_bits(wdt->hw->regmap, DA9062AA_CONTROL_F, |
50 | DA9062AA_WATCHDOG_MASK, | |
51 | DA9062AA_WATCHDOG_MASK); | |
7a7cb009 T |
52 | } |
53 | ||
54 | static int da9062_wdt_update_timeout_register(struct da9062_watchdog *wdt, | |
55 | unsigned int regval) | |
56 | { | |
57 | struct da9062 *chip = wdt->hw; | |
58 | int ret; | |
59 | ||
60 | ret = da9062_reset_watchdog_timer(wdt); | |
61 | if (ret) | |
62 | return ret; | |
63 | ||
f31b2a9b MG |
64 | regmap_update_bits(chip->regmap, |
65 | DA9062AA_CONTROL_D, | |
66 | DA9062AA_TWDSCALE_MASK, | |
67 | DA9062_TWDSCALE_DISABLE); | |
68 | ||
69 | usleep_range(150, 300); | |
70 | ||
7a7cb009 T |
71 | return regmap_update_bits(chip->regmap, |
72 | DA9062AA_CONTROL_D, | |
73 | DA9062AA_TWDSCALE_MASK, | |
74 | regval); | |
75 | } | |
76 | ||
77 | static int da9062_wdt_start(struct watchdog_device *wdd) | |
78 | { | |
79 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); | |
80 | unsigned int selector; | |
81 | int ret; | |
82 | ||
83 | selector = da9062_wdt_timeout_to_sel(wdt->wdtdev.timeout); | |
84 | ret = da9062_wdt_update_timeout_register(wdt, selector); | |
85 | if (ret) | |
86 | dev_err(wdt->hw->dev, "Watchdog failed to start (err = %d)\n", | |
87 | ret); | |
88 | ||
89 | return ret; | |
90 | } | |
91 | ||
92 | static int da9062_wdt_stop(struct watchdog_device *wdd) | |
93 | { | |
94 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); | |
95 | int ret; | |
96 | ||
97 | ret = da9062_reset_watchdog_timer(wdt); | |
98 | if (ret) { | |
99 | dev_err(wdt->hw->dev, "Failed to ping the watchdog (err = %d)\n", | |
100 | ret); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | ret = regmap_update_bits(wdt->hw->regmap, | |
105 | DA9062AA_CONTROL_D, | |
106 | DA9062AA_TWDSCALE_MASK, | |
107 | DA9062_TWDSCALE_DISABLE); | |
108 | if (ret) | |
109 | dev_err(wdt->hw->dev, "Watchdog failed to stop (err = %d)\n", | |
110 | ret); | |
111 | ||
112 | return ret; | |
113 | } | |
114 | ||
115 | static int da9062_wdt_ping(struct watchdog_device *wdd) | |
116 | { | |
117 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); | |
118 | int ret; | |
119 | ||
120 | ret = da9062_reset_watchdog_timer(wdt); | |
121 | if (ret) | |
122 | dev_err(wdt->hw->dev, "Failed to ping the watchdog (err = %d)\n", | |
123 | ret); | |
124 | ||
125 | return ret; | |
126 | } | |
127 | ||
128 | static int da9062_wdt_set_timeout(struct watchdog_device *wdd, | |
129 | unsigned int timeout) | |
130 | { | |
131 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); | |
132 | unsigned int selector; | |
133 | int ret; | |
134 | ||
135 | selector = da9062_wdt_timeout_to_sel(timeout); | |
136 | ret = da9062_wdt_update_timeout_register(wdt, selector); | |
137 | if (ret) | |
138 | dev_err(wdt->hw->dev, "Failed to set watchdog timeout (err = %d)\n", | |
139 | ret); | |
140 | else | |
141 | wdd->timeout = wdt_timeout[selector]; | |
142 | ||
143 | return ret; | |
144 | } | |
145 | ||
540f6351 MG |
146 | static int da9062_wdt_restart(struct watchdog_device *wdd, unsigned long action, |
147 | void *data) | |
148 | { | |
149 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); | |
150 | int ret; | |
151 | ||
152 | ret = regmap_write(wdt->hw->regmap, | |
153 | DA9062AA_CONTROL_F, | |
154 | DA9062AA_SHUTDOWN_MASK); | |
155 | if (ret) | |
156 | dev_alert(wdt->hw->dev, "Failed to shutdown (err = %d)\n", | |
157 | ret); | |
158 | ||
159 | /* wait for reset to assert... */ | |
160 | mdelay(500); | |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
7a7cb009 T |
165 | static const struct watchdog_info da9062_watchdog_info = { |
166 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, | |
167 | .identity = "DA9062 WDT", | |
168 | }; | |
169 | ||
170 | static const struct watchdog_ops da9062_watchdog_ops = { | |
171 | .owner = THIS_MODULE, | |
172 | .start = da9062_wdt_start, | |
173 | .stop = da9062_wdt_stop, | |
174 | .ping = da9062_wdt_ping, | |
175 | .set_timeout = da9062_wdt_set_timeout, | |
540f6351 | 176 | .restart = da9062_wdt_restart, |
7a7cb009 T |
177 | }; |
178 | ||
72106c18 ST |
179 | static const struct of_device_id da9062_compatible_id_table[] = { |
180 | { .compatible = "dlg,da9062-watchdog", }, | |
181 | { }, | |
182 | }; | |
183 | ||
184 | MODULE_DEVICE_TABLE(of, da9062_compatible_id_table); | |
185 | ||
7a7cb009 T |
186 | static int da9062_wdt_probe(struct platform_device *pdev) |
187 | { | |
6e8a7c75 | 188 | struct device *dev = &pdev->dev; |
7a7cb009 T |
189 | int ret; |
190 | struct da9062 *chip; | |
191 | struct da9062_watchdog *wdt; | |
192 | ||
6e8a7c75 | 193 | chip = dev_get_drvdata(dev->parent); |
7a7cb009 T |
194 | if (!chip) |
195 | return -EINVAL; | |
196 | ||
6e8a7c75 | 197 | wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); |
7a7cb009 T |
198 | if (!wdt) |
199 | return -ENOMEM; | |
200 | ||
201 | wdt->hw = chip; | |
202 | ||
203 | wdt->wdtdev.info = &da9062_watchdog_info; | |
204 | wdt->wdtdev.ops = &da9062_watchdog_ops; | |
205 | wdt->wdtdev.min_timeout = DA9062_WDT_MIN_TIMEOUT; | |
206 | wdt->wdtdev.max_timeout = DA9062_WDT_MAX_TIMEOUT; | |
fb484262 | 207 | wdt->wdtdev.min_hw_heartbeat_ms = DA9062_RESET_PROTECTION_MS; |
7a7cb009 T |
208 | wdt->wdtdev.timeout = DA9062_WDG_DEFAULT_TIMEOUT; |
209 | wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS; | |
6e8a7c75 | 210 | wdt->wdtdev.parent = dev; |
7a7cb009 | 211 | |
540f6351 MG |
212 | watchdog_set_restart_priority(&wdt->wdtdev, 128); |
213 | ||
7a7cb009 | 214 | watchdog_set_drvdata(&wdt->wdtdev, wdt); |
7a7cb009 | 215 | |
6e8a7c75 | 216 | ret = devm_watchdog_register_device(dev, &wdt->wdtdev); |
7a7cb009 T |
217 | if (ret < 0) { |
218 | dev_err(wdt->hw->dev, | |
219 | "watchdog registration failed (%d)\n", ret); | |
220 | return ret; | |
221 | } | |
222 | ||
528eff34 | 223 | return da9062_wdt_ping(&wdt->wdtdev); |
7a7cb009 T |
224 | } |
225 | ||
226 | static struct platform_driver da9062_wdt_driver = { | |
227 | .probe = da9062_wdt_probe, | |
7a7cb009 T |
228 | .driver = { |
229 | .name = "da9062-watchdog", | |
72106c18 | 230 | .of_match_table = da9062_compatible_id_table, |
7a7cb009 T |
231 | }, |
232 | }; | |
233 | module_platform_driver(da9062_wdt_driver); | |
234 | ||
235 | MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); | |
72106c18 | 236 | MODULE_DESCRIPTION("WDT device driver for Dialog DA9062 and DA9061"); |
7a7cb009 T |
237 | MODULE_LICENSE("GPL"); |
238 | MODULE_ALIAS("platform:da9062-watchdog"); |