1 // SPDX-License-Identifier: GPL-2.0+
3 * Watchdog driver for DA9063 PMICs.
5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
7 * Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/watchdog.h>
14 #include <linux/platform_device.h>
15 #include <linux/uaccess.h>
16 #include <linux/slab.h>
17 #include <linux/delay.h>
18 #include <linux/mfd/da9063/registers.h>
19 #include <linux/mfd/da9063/core.h>
20 #include <linux/regmap.h>
23 * Watchdog selector to timeout in seconds.
25 * others: timeout = 2048 ms * 2^(TWDSCALE-1).
27 static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
28 #define DA9063_TWDSCALE_DISABLE 0
29 #define DA9063_TWDSCALE_MIN 1
30 #define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
31 #define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN]
32 #define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX]
33 #define DA9063_WDG_TIMEOUT wdt_timeout[3]
34 #define DA9063_RESET_PROTECTION_MS 256
36 static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
40 for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) {
41 if (wdt_timeout[i] >= secs)
45 return DA9063_TWDSCALE_MAX;
48 static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval)
50 return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
51 DA9063_TWDSCALE_MASK, regval);
54 static int da9063_wdt_start(struct watchdog_device *wdd)
56 struct da9063 *da9063 = watchdog_get_drvdata(wdd);
57 unsigned int selector;
60 selector = da9063_wdt_timeout_to_sel(wdd->timeout);
61 ret = _da9063_wdt_set_timeout(da9063, selector);
63 dev_err(da9063->dev, "Watchdog failed to start (err = %d)\n",
69 static int da9063_wdt_stop(struct watchdog_device *wdd)
71 struct da9063 *da9063 = watchdog_get_drvdata(wdd);
74 ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
75 DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE);
77 dev_alert(da9063->dev, "Watchdog failed to stop (err = %d)\n",
83 static int da9063_wdt_ping(struct watchdog_device *wdd)
85 struct da9063 *da9063 = watchdog_get_drvdata(wdd);
88 ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F,
91 dev_alert(da9063->dev, "Failed to ping the watchdog (err = %d)\n",
97 static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
100 struct da9063 *da9063 = watchdog_get_drvdata(wdd);
101 unsigned int selector;
104 selector = da9063_wdt_timeout_to_sel(timeout);
105 ret = _da9063_wdt_set_timeout(da9063, selector);
107 dev_err(da9063->dev, "Failed to set watchdog timeout (err = %d)\n",
110 wdd->timeout = wdt_timeout[selector];
115 static int da9063_wdt_restart(struct watchdog_device *wdd, unsigned long action,
118 struct da9063 *da9063 = watchdog_get_drvdata(wdd);
121 ret = regmap_write(da9063->regmap, DA9063_REG_CONTROL_F,
124 dev_alert(da9063->dev, "Failed to shutdown (err = %d)\n",
130 static const struct watchdog_info da9063_watchdog_info = {
131 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
132 .identity = "DA9063 Watchdog",
135 static const struct watchdog_ops da9063_watchdog_ops = {
136 .owner = THIS_MODULE,
137 .start = da9063_wdt_start,
138 .stop = da9063_wdt_stop,
139 .ping = da9063_wdt_ping,
140 .set_timeout = da9063_wdt_set_timeout,
141 .restart = da9063_wdt_restart,
144 static int da9063_wdt_probe(struct platform_device *pdev)
146 struct da9063 *da9063;
147 struct watchdog_device *wdd;
149 if (!pdev->dev.parent)
152 da9063 = dev_get_drvdata(pdev->dev.parent);
156 wdd = devm_kzalloc(&pdev->dev, sizeof(*wdd), GFP_KERNEL);
160 wdd->info = &da9063_watchdog_info;
161 wdd->ops = &da9063_watchdog_ops;
162 wdd->min_timeout = DA9063_WDT_MIN_TIMEOUT;
163 wdd->max_timeout = DA9063_WDT_MAX_TIMEOUT;
164 wdd->min_hw_heartbeat_ms = DA9063_RESET_PROTECTION_MS;
165 wdd->timeout = DA9063_WDG_TIMEOUT;
166 wdd->parent = &pdev->dev;
168 wdd->status = WATCHDOG_NOWAYOUT_INIT_STATUS;
170 watchdog_set_restart_priority(wdd, 128);
172 watchdog_set_drvdata(wdd, da9063);
174 return devm_watchdog_register_device(&pdev->dev, wdd);
177 static struct platform_driver da9063_wdt_driver = {
178 .probe = da9063_wdt_probe,
180 .name = DA9063_DRVNAME_WATCHDOG,
183 module_platform_driver(da9063_wdt_driver);
185 MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>");
186 MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063");
187 MODULE_LICENSE("GPL");
188 MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);