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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> | |
057b52b4 | 14 | #include <linux/i2c.h> |
7a7cb009 T |
15 | #include <linux/delay.h> |
16 | #include <linux/jiffies.h> | |
17 | #include <linux/mfd/da9062/registers.h> | |
18 | #include <linux/mfd/da9062/core.h> | |
8541673d | 19 | #include <linux/property.h> |
7a7cb009 T |
20 | #include <linux/regmap.h> |
21 | #include <linux/of.h> | |
22 | ||
23 | static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 }; | |
24 | #define DA9062_TWDSCALE_DISABLE 0 | |
25 | #define DA9062_TWDSCALE_MIN 1 | |
26 | #define DA9062_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1) | |
27 | #define DA9062_WDT_MIN_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MIN] | |
28 | #define DA9062_WDT_MAX_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MAX] | |
29 | #define DA9062_WDG_DEFAULT_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MAX-1] | |
30 | #define DA9062_RESET_PROTECTION_MS 300 | |
31 | ||
32 | struct da9062_watchdog { | |
33 | struct da9062 *hw; | |
34 | struct watchdog_device wdtdev; | |
8541673d | 35 | bool use_sw_pm; |
7a7cb009 T |
36 | }; |
37 | ||
e8799ce8 SR |
38 | static unsigned int da9062_wdt_read_timeout(struct da9062_watchdog *wdt) |
39 | { | |
40 | unsigned int val; | |
41 | ||
42 | regmap_read(wdt->hw->regmap, DA9062AA_CONTROL_D, &val); | |
43 | ||
44 | return wdt_timeout[val & DA9062AA_TWDSCALE_MASK]; | |
45 | } | |
46 | ||
7a7cb009 T |
47 | static unsigned int da9062_wdt_timeout_to_sel(unsigned int secs) |
48 | { | |
49 | unsigned int i; | |
50 | ||
51 | for (i = DA9062_TWDSCALE_MIN; i <= DA9062_TWDSCALE_MAX; i++) { | |
52 | if (wdt_timeout[i] >= secs) | |
53 | return i; | |
54 | } | |
55 | ||
56 | return DA9062_TWDSCALE_MAX; | |
57 | } | |
58 | ||
59 | static int da9062_reset_watchdog_timer(struct da9062_watchdog *wdt) | |
60 | { | |
6e8a7c75 GR |
61 | return regmap_update_bits(wdt->hw->regmap, DA9062AA_CONTROL_F, |
62 | DA9062AA_WATCHDOG_MASK, | |
63 | DA9062AA_WATCHDOG_MASK); | |
7a7cb009 T |
64 | } |
65 | ||
66 | static int da9062_wdt_update_timeout_register(struct da9062_watchdog *wdt, | |
67 | unsigned int regval) | |
68 | { | |
69 | struct da9062 *chip = wdt->hw; | |
7a7cb009 | 70 | |
f31b2a9b MG |
71 | regmap_update_bits(chip->regmap, |
72 | DA9062AA_CONTROL_D, | |
73 | DA9062AA_TWDSCALE_MASK, | |
74 | DA9062_TWDSCALE_DISABLE); | |
75 | ||
76 | usleep_range(150, 300); | |
77 | ||
7a7cb009 T |
78 | return regmap_update_bits(chip->regmap, |
79 | DA9062AA_CONTROL_D, | |
80 | DA9062AA_TWDSCALE_MASK, | |
81 | regval); | |
82 | } | |
83 | ||
84 | static int da9062_wdt_start(struct watchdog_device *wdd) | |
85 | { | |
86 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); | |
87 | unsigned int selector; | |
88 | int ret; | |
89 | ||
90 | selector = da9062_wdt_timeout_to_sel(wdt->wdtdev.timeout); | |
91 | ret = da9062_wdt_update_timeout_register(wdt, selector); | |
92 | if (ret) | |
93 | dev_err(wdt->hw->dev, "Watchdog failed to start (err = %d)\n", | |
94 | ret); | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | static int da9062_wdt_stop(struct watchdog_device *wdd) | |
100 | { | |
101 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); | |
102 | int ret; | |
103 | ||
7a7cb009 T |
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); | |
057b52b4 | 150 | struct i2c_client *client = to_i2c_client(wdt->hw->dev); |
540f6351 MG |
151 | int ret; |
152 | ||
057b52b4 MF |
153 | /* Don't use regmap because it is not atomic safe */ |
154 | ret = i2c_smbus_write_byte_data(client, DA9062AA_CONTROL_F, | |
155 | DA9062AA_SHUTDOWN_MASK); | |
156 | if (ret < 0) | |
540f6351 MG |
157 | dev_alert(wdt->hw->dev, "Failed to shutdown (err = %d)\n", |
158 | ret); | |
159 | ||
160 | /* wait for reset to assert... */ | |
161 | mdelay(500); | |
162 | ||
163 | return ret; | |
164 | } | |
165 | ||
7a7cb009 T |
166 | static const struct watchdog_info da9062_watchdog_info = { |
167 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, | |
168 | .identity = "DA9062 WDT", | |
169 | }; | |
170 | ||
171 | static const struct watchdog_ops da9062_watchdog_ops = { | |
172 | .owner = THIS_MODULE, | |
173 | .start = da9062_wdt_start, | |
174 | .stop = da9062_wdt_stop, | |
175 | .ping = da9062_wdt_ping, | |
176 | .set_timeout = da9062_wdt_set_timeout, | |
540f6351 | 177 | .restart = da9062_wdt_restart, |
7a7cb009 T |
178 | }; |
179 | ||
72106c18 ST |
180 | static const struct of_device_id da9062_compatible_id_table[] = { |
181 | { .compatible = "dlg,da9062-watchdog", }, | |
182 | { }, | |
183 | }; | |
184 | ||
185 | MODULE_DEVICE_TABLE(of, da9062_compatible_id_table); | |
186 | ||
7a7cb009 T |
187 | static int da9062_wdt_probe(struct platform_device *pdev) |
188 | { | |
6e8a7c75 | 189 | struct device *dev = &pdev->dev; |
e8799ce8 | 190 | unsigned int timeout; |
7a7cb009 T |
191 | struct da9062 *chip; |
192 | struct da9062_watchdog *wdt; | |
193 | ||
6e8a7c75 | 194 | chip = dev_get_drvdata(dev->parent); |
7a7cb009 T |
195 | if (!chip) |
196 | return -EINVAL; | |
197 | ||
6e8a7c75 | 198 | wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); |
7a7cb009 T |
199 | if (!wdt) |
200 | return -ENOMEM; | |
201 | ||
8541673d MF |
202 | wdt->use_sw_pm = device_property_present(dev, "dlg,use-sw-pm"); |
203 | ||
7a7cb009 T |
204 | wdt->hw = chip; |
205 | ||
206 | wdt->wdtdev.info = &da9062_watchdog_info; | |
207 | wdt->wdtdev.ops = &da9062_watchdog_ops; | |
208 | wdt->wdtdev.min_timeout = DA9062_WDT_MIN_TIMEOUT; | |
209 | wdt->wdtdev.max_timeout = DA9062_WDT_MAX_TIMEOUT; | |
fb484262 | 210 | wdt->wdtdev.min_hw_heartbeat_ms = DA9062_RESET_PROTECTION_MS; |
7a7cb009 T |
211 | wdt->wdtdev.timeout = DA9062_WDG_DEFAULT_TIMEOUT; |
212 | wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS; | |
6e8a7c75 | 213 | wdt->wdtdev.parent = dev; |
7a7cb009 | 214 | |
540f6351 MG |
215 | watchdog_set_restart_priority(&wdt->wdtdev, 128); |
216 | ||
7a7cb009 | 217 | watchdog_set_drvdata(&wdt->wdtdev, wdt); |
f6c98b08 | 218 | dev_set_drvdata(dev, &wdt->wdtdev); |
7a7cb009 | 219 | |
e8799ce8 SR |
220 | timeout = da9062_wdt_read_timeout(wdt); |
221 | if (timeout) | |
222 | wdt->wdtdev.timeout = timeout; | |
223 | ||
224 | /* Set timeout from DT value if available */ | |
225 | watchdog_init_timeout(&wdt->wdtdev, 0, dev); | |
226 | ||
227 | if (timeout) { | |
228 | da9062_wdt_set_timeout(&wdt->wdtdev, wdt->wdtdev.timeout); | |
229 | set_bit(WDOG_HW_RUNNING, &wdt->wdtdev.status); | |
230 | } | |
7a7cb009 | 231 | |
e8799ce8 | 232 | return devm_watchdog_register_device(dev, &wdt->wdtdev); |
7a7cb009 T |
233 | } |
234 | ||
f6c98b08 MF |
235 | static int __maybe_unused da9062_wdt_suspend(struct device *dev) |
236 | { | |
237 | struct watchdog_device *wdd = dev_get_drvdata(dev); | |
8541673d MF |
238 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); |
239 | ||
240 | if (!wdt->use_sw_pm) | |
241 | return 0; | |
f6c98b08 MF |
242 | |
243 | if (watchdog_active(wdd)) | |
244 | return da9062_wdt_stop(wdd); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | static int __maybe_unused da9062_wdt_resume(struct device *dev) | |
250 | { | |
251 | struct watchdog_device *wdd = dev_get_drvdata(dev); | |
8541673d MF |
252 | struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); |
253 | ||
254 | if (!wdt->use_sw_pm) | |
255 | return 0; | |
f6c98b08 MF |
256 | |
257 | if (watchdog_active(wdd)) | |
258 | return da9062_wdt_start(wdd); | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | static SIMPLE_DEV_PM_OPS(da9062_wdt_pm_ops, | |
264 | da9062_wdt_suspend, da9062_wdt_resume); | |
265 | ||
7a7cb009 T |
266 | static struct platform_driver da9062_wdt_driver = { |
267 | .probe = da9062_wdt_probe, | |
7a7cb009 T |
268 | .driver = { |
269 | .name = "da9062-watchdog", | |
f6c98b08 | 270 | .pm = &da9062_wdt_pm_ops, |
72106c18 | 271 | .of_match_table = da9062_compatible_id_table, |
7a7cb009 T |
272 | }, |
273 | }; | |
274 | module_platform_driver(da9062_wdt_driver); | |
275 | ||
276 | MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); | |
72106c18 | 277 | MODULE_DESCRIPTION("WDT device driver for Dialog DA9062 and DA9061"); |
7a7cb009 T |
278 | MODULE_LICENSE("GPL"); |
279 | MODULE_ALIAS("platform:da9062-watchdog"); |