1 // SPDX-License-Identifier: GPL-2.0-only
14 #include <linux/reset.h>
33 #define DEVICE_NAME		"sunplus-wdt"
55 	void __iomem *base = priv->base;  in sp_wdt_restart()
69 	void __iomem *base = priv->base;  in sp_wdt_ping()
72 	if (wdev->timeout > SP_WDT_MAX_TIMEOUT) {  in sp_wdt_ping()
73 		/* WDT_CONMAX sets the count to the maximum (down-counting). */  in sp_wdt_ping()
78 		 * Watchdog timer is a 20-bit down-counting based on STC_CLK.  in sp_wdt_ping()
82 		count = (wdev->timeout * STC_CLK) >> 4;  in sp_wdt_ping()
93 	void __iomem *base = priv->base;  in sp_wdt_stop()
103 	void __iomem *base = priv->base;  in sp_wdt_start()
113 	void __iomem *base = priv->base;  in sp_wdt_get_timeleft()
146 	struct device *dev = &pdev->dev;  in sp_wdt_probe()
152 		return -ENOMEM;  in sp_wdt_probe()
154 	priv->clk = devm_clk_get_enabled(dev, NULL);  in sp_wdt_probe()
155 	if (IS_ERR(priv->clk))  in sp_wdt_probe()
156 		return dev_err_probe(dev, PTR_ERR(priv->clk), "Failed to enable clock\n");  in sp_wdt_probe()
158 	/* The timer and watchdog shared the STC reset */  in sp_wdt_probe()
159 	priv->rstc = devm_reset_control_get_shared(dev, NULL);  in sp_wdt_probe()
160 	if (IS_ERR(priv->rstc))  in sp_wdt_probe()
161 		return dev_err_probe(dev, PTR_ERR(priv->rstc), "Failed to get reset\n");  in sp_wdt_probe()
163 	reset_control_deassert(priv->rstc);  in sp_wdt_probe()
165 	ret = devm_add_action_or_reset(dev, sp_reset_control_assert, priv->rstc);  in sp_wdt_probe()
169 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in sp_wdt_probe()
170 	if (IS_ERR(priv->base))  in sp_wdt_probe()
171 		return PTR_ERR(priv->base);  in sp_wdt_probe()
173 	priv->wdev.info = &sp_wdt_info;  in sp_wdt_probe()
174 	priv->wdev.ops = &sp_wdt_ops;  in sp_wdt_probe()
175 	priv->wdev.timeout = SP_WDT_DEFAULT_TIMEOUT;  in sp_wdt_probe()
176 	priv->wdev.max_hw_heartbeat_ms = SP_WDT_MAX_TIMEOUT * 1000;  in sp_wdt_probe()
177 	priv->wdev.min_timeout = 1;  in sp_wdt_probe()
178 	priv->wdev.parent = dev;  in sp_wdt_probe()
180 	watchdog_set_drvdata(&priv->wdev, priv);  in sp_wdt_probe()
181 	watchdog_init_timeout(&priv->wdev, timeout, dev);  in sp_wdt_probe()
182 	watchdog_set_nowayout(&priv->wdev, nowayout);  in sp_wdt_probe()
183 	watchdog_stop_on_reboot(&priv->wdev);  in sp_wdt_probe()
184 	watchdog_set_restart_priority(&priv->wdev, 128);  in sp_wdt_probe()
186 	return devm_watchdog_register_device(dev, &priv->wdev);  in sp_wdt_probe()
190 	{.compatible = "sunplus,sp7021-wdt", },