1 // SPDX-License-Identifier: GPL-2.0
3  * Renesas RZ/G2L WDT Watchdog Driver
42 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
64 	ndelay(priv->delay);  in rzg2l_wdt_wait_delay()
79 	writel_relaxed(val, priv->base + reg);  in rzg2l_wdt_write()
93 	time_out = (wdev->timeout * (MICRO / 2)) /  in rzg2l_wdt_init_timeout()
94 		   rzg2l_wdt_get_cycle_usec(priv->osc_clk_rate, 0);  in rzg2l_wdt_init_timeout()
103 	ret = pm_runtime_resume_and_get(wdev->parent);  in rzg2l_wdt_start()
107 	ret = reset_control_deassert(priv->rstc);  in rzg2l_wdt_start()
109 		pm_runtime_put(wdev->parent);  in rzg2l_wdt_start()
119 	/* Enable watchdog timer*/  in rzg2l_wdt_start()
130 	ret = reset_control_assert(priv->rstc);  in rzg2l_wdt_stop()
134 	ret = pm_runtime_put(wdev->parent);  in rzg2l_wdt_stop()
145 	wdev->timeout = timeout;  in rzg2l_wdt_set_timeout()
169 	clk_prepare_enable(priv->pclk);  in rzg2l_wdt_restart()
170 	clk_prepare_enable(priv->osc_clk);  in rzg2l_wdt_restart()
172 	if (priv->devtype == WDT_RZG2L) {  in rzg2l_wdt_restart()
173 		ret = reset_control_deassert(priv->rstc);  in rzg2l_wdt_restart()
184 		ret = reset_control_reset(priv->rstc);  in rzg2l_wdt_restart()
188 		wdev->timeout = 0;  in rzg2l_wdt_restart()
196 		/* Enable watchdog timer*/  in rzg2l_wdt_restart()
200 		mdelay(DIV_ROUND_UP(2 * 0xFFFFF * 1000, priv->osc_clk_rate));  in rzg2l_wdt_restart()
208 	.identity = "Renesas RZ/G2L WDT Watchdog",
233 	pm_runtime_disable(wdev->parent);  in rzg2l_wdt_pm_disable()
238 	struct device *dev = &pdev->dev;  in rzg2l_wdt_probe()
245 		return -ENOMEM;  in rzg2l_wdt_probe()
247 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in rzg2l_wdt_probe()
248 	if (IS_ERR(priv->base))  in rzg2l_wdt_probe()
249 		return PTR_ERR(priv->base);  in rzg2l_wdt_probe()
252 	priv->osc_clk = devm_clk_get(&pdev->dev, "oscclk");  in rzg2l_wdt_probe()
253 	if (IS_ERR(priv->osc_clk))  in rzg2l_wdt_probe()
254 		return dev_err_probe(&pdev->dev, PTR_ERR(priv->osc_clk), "no oscclk");  in rzg2l_wdt_probe()
256 	priv->osc_clk_rate = clk_get_rate(priv->osc_clk);  in rzg2l_wdt_probe()
257 	if (!priv->osc_clk_rate)  in rzg2l_wdt_probe()
258 		return dev_err_probe(&pdev->dev, -EINVAL, "oscclk rate is 0");  in rzg2l_wdt_probe()
261 	priv->pclk = devm_clk_get(&pdev->dev, "pclk");  in rzg2l_wdt_probe()
262 	if (IS_ERR(priv->pclk))  in rzg2l_wdt_probe()
263 		return dev_err_probe(&pdev->dev, PTR_ERR(priv->pclk), "no pclk");  in rzg2l_wdt_probe()
265 	pclk_rate = clk_get_rate(priv->pclk);  in rzg2l_wdt_probe()
267 		return dev_err_probe(&pdev->dev, -EINVAL, "pclk rate is 0");  in rzg2l_wdt_probe()
269 	priv->delay = F2CYCLE_NSEC(priv->osc_clk_rate) * 6 + F2CYCLE_NSEC(pclk_rate) * 9;  in rzg2l_wdt_probe()
271 	priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);  in rzg2l_wdt_probe()
272 	if (IS_ERR(priv->rstc))  in rzg2l_wdt_probe()
273 		return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc),  in rzg2l_wdt_probe()
276 	priv->devtype = (uintptr_t)of_device_get_match_data(dev);  in rzg2l_wdt_probe()
278 	pm_runtime_enable(&pdev->dev);  in rzg2l_wdt_probe()
280 	priv->wdev.info = &rzg2l_wdt_ident;  in rzg2l_wdt_probe()
281 	priv->wdev.ops = &rzg2l_wdt_ops;  in rzg2l_wdt_probe()
282 	priv->wdev.parent = dev;  in rzg2l_wdt_probe()
283 	priv->wdev.min_timeout = 1;  in rzg2l_wdt_probe()
284 	priv->wdev.max_timeout = rzg2l_wdt_get_cycle_usec(priv->osc_clk_rate, 0xfff) /  in rzg2l_wdt_probe()
286 	priv->wdev.timeout = WDT_DEFAULT_TIMEOUT;  in rzg2l_wdt_probe()
288 	watchdog_set_drvdata(&priv->wdev, priv);  in rzg2l_wdt_probe()
290 	ret = devm_add_action_or_reset(&pdev->dev, rzg2l_wdt_pm_disable, &priv->wdev);  in rzg2l_wdt_probe()
294 	watchdog_set_nowayout(&priv->wdev, nowayout);  in rzg2l_wdt_probe()
295 	watchdog_stop_on_unregister(&priv->wdev);  in rzg2l_wdt_probe()
297 	ret = watchdog_init_timeout(&priv->wdev, 0, dev);  in rzg2l_wdt_probe()
301 	return devm_watchdog_register_device(&pdev->dev, &priv->wdev);  in rzg2l_wdt_probe()
305 	{ .compatible = "renesas,rzg2l-wdt", .data = (void *)WDT_RZG2L },
306 	{ .compatible = "renesas,rzv2m-wdt", .data = (void *)WDT_RZV2M },
315 	if (!watchdog_active(&priv->wdev))  in rzg2l_wdt_suspend_late()
318 	return rzg2l_wdt_stop(&priv->wdev);  in rzg2l_wdt_suspend_late()
325 	if (!watchdog_active(&priv->wdev))  in rzg2l_wdt_resume_early()
328 	return rzg2l_wdt_start(&priv->wdev);  in rzg2l_wdt_resume_early()
345 MODULE_DESCRIPTION("Renesas RZ/G2L WDT Watchdog Driver");