1 // SPDX-License-Identifier: GPL-2.0-only
11 #include <linux/mfd/rohm-bd96801.h>
12 #include <linux/mfd/rohm-generic.h>
43 /* 1.1 mS */
54  * timeout values. SHORT time is meaningful only in window mode where feeding
57  * timeout time is a multiple of (2, 4, 8 or 16 times) the SHORT timeout.
70 	return regmap_update_bits(w->regmap, BD96801_REG_WD_FEED,  in bd96801_wdt_ping()
78 	return regmap_update_bits(w->regmap, BD96801_REG_WD_CONF,  in bd96801_wdt_start()
86 	return regmap_update_bits(w->regmap, BD96801_REG_WD_CONF,  in bd96801_wdt_stop()
111 		return -EINVAL;  in find_closest_fast()
130 		return -EINVAL;  in find_closest_slow_by_fast()
159 		return -EINVAL;  in find_closest_slow()
170 	struct device *dev = w->dev;  in bd96801_set_wdt_mode()
174 		dev_err(dev, "Unsupported fast timeout %u uS [max %u]\n",  in bd96801_set_wdt_mode()
177 		return -EINVAL;  in bd96801_set_wdt_mode()
181 		dev_err(dev, "Unsupported slow timeout %u uS [max %u]\n",  in bd96801_set_wdt_mode()
184 		return -EINVAL;  in bd96801_set_wdt_mode()
206 				"can't support slow timeout %u uS using fast %u uS. [max slow %u uS]\n",  in bd96801_set_wdt_mode()
211 		w->wdt.min_hw_heartbeat_ms = min / 10;  in bd96801_set_wdt_mode()
220 	w->wdt.max_hw_heartbeat_ms = hw_margin / 10;  in bd96801_set_wdt_mode()
226 	ret = regmap_update_bits(w->regmap, BD96801_REG_WD_TMO,  in bd96801_set_wdt_mode()
231 	ret = regmap_update_bits(w->regmap, BD96801_REG_WD_CONF,  in bd96801_set_wdt_mode()
244 	 * The BD96801 supports a somewhat peculiar QA-mode, which we do not  in bd96801_set_heartbeat_from_hw()
245 	 * support in this driver. If the QA-mode is enabled then we just  in bd96801_set_heartbeat_from_hw()
246 	 * warn and bail-out.  in bd96801_set_heartbeat_from_hw()
249 		dev_err(w->dev, "watchdog set to Q&A mode - exiting\n");  in bd96801_set_heartbeat_from_hw()
250 		return -EINVAL;  in bd96801_set_heartbeat_from_hw()
253 	ret = regmap_read(w->regmap, BD96801_REG_WD_TMO, &val);  in bd96801_set_heartbeat_from_hw()
261 	w->wdt.max_hw_heartbeat_ms = (fast << sel) / USEC_PER_MSEC;  in bd96801_set_heartbeat_from_hw()
264 		w->wdt.min_hw_heartbeat_ms = fast / USEC_PER_MSEC;  in bd96801_set_heartbeat_from_hw()
275 	count = device_property_count_u32(w->dev->parent, "rohm,hw-timeout-ms");  in init_wdg_hw()
276 	if (count < 0 && count != -EINVAL)  in init_wdg_hw()
281 			return -EINVAL;  in init_wdg_hw()
283 		ret = device_property_read_u32_array(w->dev->parent,  in init_wdg_hw()
284 						     "rohm,hw-timeout-ms",  in init_wdg_hw()
307 	ret = device_property_match_string(w->dev->parent, "rohm,wdg-action",  in init_wdg_hw()
310 		ret = regmap_update_bits(w->regmap, BD96801_REG_WD_CONF,  in init_wdg_hw()
316 	ret = device_property_match_string(w->dev->parent, "rohm,wdg-action",  in init_wdg_hw()
317 					   "intb-only");  in init_wdg_hw()
319 		ret = regmap_update_bits(w->regmap, BD96801_REG_WD_CONF,  in init_wdg_hw()
341 	w = devm_kzalloc(&pdev->dev, sizeof(*w), GFP_KERNEL);  in bd96801_wdt_probe()
343 		return -ENOMEM;  in bd96801_wdt_probe()
345 	w->regmap = dev_get_regmap(pdev->dev.parent, NULL);  in bd96801_wdt_probe()
346 	w->dev = &pdev->dev;  in bd96801_wdt_probe()
348 	w->wdt.info = &bd96801_wdt_info;  in bd96801_wdt_probe()
349 	w->wdt.ops =  &bd96801_wdt_ops;  in bd96801_wdt_probe()
350 	w->wdt.parent = pdev->dev.parent;  in bd96801_wdt_probe()
351 	w->wdt.timeout = DEFAULT_TIMEOUT;  in bd96801_wdt_probe()
352 	watchdog_set_drvdata(&w->wdt, w);  in bd96801_wdt_probe()
354 	ret = regmap_read(w->regmap, BD96801_REG_WD_CONF, &val);  in bd96801_wdt_probe()
356 		return dev_err_probe(&pdev->dev, ret,  in bd96801_wdt_probe()
361 	 * In this case we just update the hw-timeout based on values set to  in bd96801_wdt_probe()
362 	 * the timeout / mode registers and leave the hardware configs  in bd96801_wdt_probe()
366 		dev_dbg(&pdev->dev, "watchdog was running during probe\n");  in bd96801_wdt_probe()
371 		set_bit(WDOG_HW_RUNNING, &w->wdt.status);  in bd96801_wdt_probe()
379 	dev_dbg(w->dev, "heartbeat set to %u - %u\n",  in bd96801_wdt_probe()
380 		w->wdt.min_hw_heartbeat_ms, w->wdt.max_hw_heartbeat_ms);  in bd96801_wdt_probe()
382 	watchdog_init_timeout(&w->wdt, 0, pdev->dev.parent);  in bd96801_wdt_probe()
383 	watchdog_set_nowayout(&w->wdt, nowayout);  in bd96801_wdt_probe()
384 	watchdog_stop_on_reboot(&w->wdt);  in bd96801_wdt_probe()
386 	irq = platform_get_irq_byname(pdev, "bd96801-wdg");  in bd96801_wdt_probe()
388 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,  in bd96801_wdt_probe()
390 						IRQF_ONESHOT,  "bd96801-wdg",  in bd96801_wdt_probe()
393 			return dev_err_probe(&pdev->dev, ret,  in bd96801_wdt_probe()
397 	return devm_watchdog_register_device(&pdev->dev, &w->wdt);  in bd96801_wdt_probe()
401 	{ "bd96801-wdt", },
408 		.name = "bd96801-wdt"