1 // SPDX-License-Identifier: GPL-2.0
25  * One-time writable lock bit. If set forbids
39 #define INTEL_OC_WDT_CTRL_REG(wdt)	((wdt)->ctrl_res->start)
45 	bool locked;  member
62 	if (oc_wdt->locked)  in intel_oc_wdt_start()
96 	outl((inl(INTEL_OC_WDT_CTRL_REG(oc_wdt)) & ~INTEL_OC_WDT_TOV) | (t - 1),  in intel_oc_wdt_set_timeout()
99 	wdd->timeout = t;  in intel_oc_wdt_set_timeout()
124 		oc_wdt->wdd.bootstatus |= WDIOF_CARDRESET;  in intel_oc_wdt_setup()
126 	oc_wdt->locked = !!(val & INTEL_OC_WDT_CTL_LCK);  in intel_oc_wdt_setup()
134 		set_bit(WDOG_HW_RUNNING, &oc_wdt->wdd.status);  in intel_oc_wdt_setup()
136 		if (oc_wdt->locked) {  in intel_oc_wdt_setup()
143 			 * If we are locked read the current timeout value  in intel_oc_wdt_setup()
146 			oc_wdt->wdd.timeout = (val & INTEL_OC_WDT_TOV) + 1;  in intel_oc_wdt_setup()
147 			oc_wdt->info.options &= ~WDIOF_SETTIMEOUT;  in intel_oc_wdt_setup()
149 			dev_info(oc_wdt->wdd.parent,  in intel_oc_wdt_setup()
150 				 "Register access locked, heartbeat fixed at: %u s\n",  in intel_oc_wdt_setup()
151 				 oc_wdt->wdd.timeout);  in intel_oc_wdt_setup()
153 	} else if (oc_wdt->locked) {  in intel_oc_wdt_setup()
155 		 * In case the watchdog is disabled and locked there  in intel_oc_wdt_setup()
158 		return -EACCES;  in intel_oc_wdt_setup()
162 	outl(val | (oc_wdt->wdd.timeout - 1), INTEL_OC_WDT_CTRL_REG(oc_wdt));  in intel_oc_wdt_setup()
169 	struct device *dev = &pdev->dev;  in intel_oc_wdt_probe()
174 	oc_wdt = devm_kzalloc(&pdev->dev, sizeof(*oc_wdt), GFP_KERNEL);  in intel_oc_wdt_probe()
176 		return -ENOMEM;  in intel_oc_wdt_probe()
178 	oc_wdt->ctrl_res = platform_get_resource(pdev, IORESOURCE_IO, 0);  in intel_oc_wdt_probe()
179 	if (!oc_wdt->ctrl_res) {  in intel_oc_wdt_probe()
180 		dev_err(&pdev->dev, "missing I/O resource\n");  in intel_oc_wdt_probe()
181 		return -ENODEV;  in intel_oc_wdt_probe()
184 	if (!devm_request_region(&pdev->dev, oc_wdt->ctrl_res->start,  in intel_oc_wdt_probe()
185 				 resource_size(oc_wdt->ctrl_res), pdev->name)) {  in intel_oc_wdt_probe()
187 			oc_wdt->ctrl_res);  in intel_oc_wdt_probe()
188 		return -EBUSY;  in intel_oc_wdt_probe()
191 	wdd = &oc_wdt->wdd;  in intel_oc_wdt_probe()
192 	wdd->min_timeout = INTEL_OC_WDT_MIN_TOV;  in intel_oc_wdt_probe()
193 	wdd->max_timeout = INTEL_OC_WDT_MAX_TOV;  in intel_oc_wdt_probe()
194 	wdd->timeout = INTEL_OC_WDT_DEF_TOV;  in intel_oc_wdt_probe()
195 	oc_wdt->info = intel_oc_wdt_info;  in intel_oc_wdt_probe()
196 	wdd->info = &oc_wdt->info;  in intel_oc_wdt_probe()
197 	wdd->ops = &intel_oc_wdt_ops;  in intel_oc_wdt_probe()
198 	wdd->parent = dev;  in intel_oc_wdt_probe()