1 // SPDX-License-Identifier: GPL-2.0+
13 #include <linux/mfd/rave-sp.h>
15 #include <linux/nvmem-consumer.h>
29  * struct rave_sp_wdt_variant - RAVE SP watchdog variant
31  * @max_timeout:	Largest possible watchdog timeout setting
32  * @min_timeout:	Smallest possible watchdog timeout setting
46  * struct rave_sp_wdt - RAVE SP watchdog
68 	return rave_sp_exec(to_rave_sp_wdt(wdd)->sp,  in rave_sp_wdt_exec()
74 	u8 cmd[] = {  in rave_sp_wdt_legacy_configure()  local
79 		[4] = on ? wdd->timeout : 0,  in rave_sp_wdt_legacy_configure()
82 	return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));  in rave_sp_wdt_legacy_configure()
87 	u8 cmd[] = {  in rave_sp_wdt_rdu_configure()  local
91 		[3] = (u8)wdd->timeout,  in rave_sp_wdt_rdu_configure()
92 		[4] = (u8)(wdd->timeout >> 8),  in rave_sp_wdt_rdu_configure()
95 	return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));  in rave_sp_wdt_rdu_configure()
99  * rave_sp_wdt_configure - Configure watchdog device
106  *  - Wheither it is ON or OFF
107  *  - Its timeout duration
110  * the value of 'wdd->timeout'.
114 	return to_rave_sp_wdt(wdd)->variant->configure(wdd, on);  in rave_sp_wdt_configure()
119 	u8 cmd[] = {  in rave_sp_wdt_legacy_restart()  local
125 	return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));  in rave_sp_wdt_legacy_restart()
130 	u8 cmd[] = {  in rave_sp_wdt_rdu_restart()  local
137 	return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));  in rave_sp_wdt_rdu_restart()
146 	 * wait 500ms before actually resetting us, so we ask it to do  in rave_sp_wdt_reboot_notifier()
154 		const int ret = sp_wd->variant->restart(&sp_wd->wdd);  in rave_sp_wdt_reboot_notifier()
157 			dev_err(sp_wd->wdd.parent,  in rave_sp_wdt_reboot_notifier()
170 	 * firmware waits 500 ms before issuing reset, so let's hang  in rave_sp_wdt_restart()
176 	return -EIO;  in rave_sp_wdt_restart()
185 		set_bit(WDOG_HW_RUNNING, &wdd->status);  in rave_sp_wdt_start()
196 				   unsigned int timeout)  in rave_sp_wdt_set_timeout()  argument
198 	wdd->timeout = timeout;  in rave_sp_wdt_set_timeout()
205 	u8 cmd[] = {  in rave_sp_wdt_ping()  local
210 	return rave_sp_wdt_exec(wdd, cmd, sizeof(cmd));  in rave_sp_wdt_ping()
243 		.compatible = "zii,rave-sp-watchdog-legacy",
247 		.compatible = "zii,rave-sp-watchdog",
255 	struct device *dev = &pdev->dev;  in rave_sp_wdt_probe()
259 	__le16 timeout = 0;  in rave_sp_wdt_probe()  local
264 		return -ENOMEM;  in rave_sp_wdt_probe()
266 	sp_wd->variant = of_device_get_match_data(dev);  in rave_sp_wdt_probe()
267 	sp_wd->sp      = dev_get_drvdata(dev->parent);  in rave_sp_wdt_probe()
269 	wdd              = &sp_wd->wdd;  in rave_sp_wdt_probe()
270 	wdd->parent      = dev;  in rave_sp_wdt_probe()
271 	wdd->info        = &rave_sp_wdt_info;  in rave_sp_wdt_probe()
272 	wdd->ops         = &rave_sp_wdt_ops;  in rave_sp_wdt_probe()
273 	wdd->min_timeout = sp_wd->variant->min_timeout;  in rave_sp_wdt_probe()
274 	wdd->max_timeout = sp_wd->variant->max_timeout;  in rave_sp_wdt_probe()
275 	wdd->status      = WATCHDOG_NOWAYOUT_INIT_STATUS;  in rave_sp_wdt_probe()
276 	wdd->timeout     = 60;  in rave_sp_wdt_probe()
278 	cell = nvmem_cell_get(dev, "wdt-timeout");  in rave_sp_wdt_probe()
284 			memcpy(&timeout, value, min(len, sizeof(timeout)));  in rave_sp_wdt_probe()
289 	watchdog_init_timeout(wdd, le16_to_cpu(timeout), dev);  in rave_sp_wdt_probe()
293 	sp_wd->reboot_notifier.notifier_call = rave_sp_wdt_reboot_notifier;  in rave_sp_wdt_probe()
294 	ret = devm_register_reboot_notifier(dev, &sp_wd->reboot_notifier);  in rave_sp_wdt_probe()
304 	wdd->max_hw_heartbeat_ms = wdd->max_timeout * 1000;  in rave_sp_wdt_probe()
336 MODULE_ALIAS("platform:rave-sp-watchdog");