1 // SPDX-License-Identifier: GPL-2.0-or-later
15 #include <linux/watchdog.h>
17 #define DRV_NAME "pseries-wdt"
24  *         Bits 48-55: "operation"
31  *         Bits 56-63: "timeoutAction" (for "Start Watchdog" only)
65  * - For the "Query Watchdog Capabilities" operation, a 64-bit
80 MODULE_PARM_DESC(action, "Action taken when watchdog expires (default="
85 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
91 MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds (default="
97 	unsigned long num;		/* Watchdog numbers are 1-based */
103 	struct device *dev = wdd->parent;  in pseries_wdt_start()
107 	flags = pw->action | PSERIES_WDTF_OP_START;  in pseries_wdt_start()
108 	msecs = wdd->timeout * MSEC_PER_SEC;  in pseries_wdt_start()
109 	rc = plpar_hcall_norets(H_WATCHDOG, flags, pw->num, msecs);  in pseries_wdt_start()
112 			 rc, pw->num);  in pseries_wdt_start()
113 		return -EIO;  in pseries_wdt_start()
121 	struct device *dev = wdd->parent;  in pseries_wdt_stop()
124 	rc = plpar_hcall_norets(H_WATCHDOG, PSERIES_WDTF_OP_STOP, pw->num);  in pseries_wdt_stop()
127 			 rc, pw->num);  in pseries_wdt_stop()
128 		return -EIO;  in pseries_wdt_stop()
155 		return -ENODEV;  in pseries_wdt_probe()
157 		return -EIO;  in pseries_wdt_probe()
160 	pw = devm_kzalloc(&pdev->dev, sizeof(*pw), GFP_KERNEL);  in pseries_wdt_probe()
162 		return -ENOMEM;  in pseries_wdt_probe()
166 	 * multiple timers we will need to devise a way to choose a  in pseries_wdt_probe()
170 	pw->num = 1;  in pseries_wdt_probe()
171 	if (PSERIES_WDTQ_MAX_NUMBER(cap) < pw->num)  in pseries_wdt_probe()
172 		return -ENODEV;  in pseries_wdt_probe()
175 		return -EINVAL;  in pseries_wdt_probe()
176 	pw->action = pseries_wdt_action[action];  in pseries_wdt_probe()
178 	pw->wd.parent = &pdev->dev;  in pseries_wdt_probe()
179 	pw->wd.info = &pseries_wdt_info;  in pseries_wdt_probe()
180 	pw->wd.ops = &pseries_wdt_ops;  in pseries_wdt_probe()
182 	pw->wd.min_timeout = DIV_ROUND_UP(msecs, MSEC_PER_SEC);  in pseries_wdt_probe()
183 	pw->wd.max_timeout = UINT_MAX / 1000;	/* from linux/watchdog.h */  in pseries_wdt_probe()
184 	pw->wd.timeout = timeout;  in pseries_wdt_probe()
185 	if (watchdog_init_timeout(&pw->wd, 0, NULL))  in pseries_wdt_probe()
186 		return -EINVAL;  in pseries_wdt_probe()
187 	watchdog_set_nowayout(&pw->wd, nowayout);  in pseries_wdt_probe()
188 	watchdog_stop_on_reboot(&pw->wd);  in pseries_wdt_probe()
189 	watchdog_stop_on_unregister(&pw->wd);  in pseries_wdt_probe()
190 	watchdog_set_drvdata(&pw->wd, pw);  in pseries_wdt_probe()
192 	err = devm_watchdog_register_device(&pdev->dev, &pw->wd);  in pseries_wdt_probe()
196 	platform_set_drvdata(pdev, &pw->wd);  in pseries_wdt_probe()
220 	{ .name = "pseries-wdt" },
238 MODULE_DESCRIPTION("POWER Architecture Platform Watchdog Driver");