1 // SPDX-License-Identifier: GPL-2.0
3  * MStar WDT driver
5  * Copyright (C) 2019 - 2021 Daniel Palmer
41 	err = clk_prepare_enable(priv->clk);  in msc313e_wdt_start()
45 	timeout = wdev->timeout * clk_get_rate(priv->clk);  in msc313e_wdt_start()
46 	writew(timeout & 0xffff, priv->base + REG_WDT_MAX_PRD_L);  in msc313e_wdt_start()
47 	writew((timeout >> 16) & 0xffff, priv->base + REG_WDT_MAX_PRD_H);  in msc313e_wdt_start()
48 	writew(1, priv->base + REG_WDT_CLR);  in msc313e_wdt_start()
56 	writew(1, priv->base + REG_WDT_CLR);  in msc313e_wdt_ping()
64 	writew(0, priv->base + REG_WDT_MAX_PRD_L);  in msc313e_wdt_stop()
65 	writew(0, priv->base + REG_WDT_MAX_PRD_H);  in msc313e_wdt_stop()
66 	writew(0, priv->base + REG_WDT_CLR);  in msc313e_wdt_stop()
67 	clk_disable_unprepare(priv->clk);  in msc313e_wdt_stop()
73 	wdev->timeout = new_time;  in msc313e_wdt_settimeout()
79 	.identity = "MSC313e watchdog",
92 	{ .compatible = "mstar,msc313e-wdt", },
99 	struct device *dev = &pdev->dev;  in msc313e_wdt_probe()
102 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in msc313e_wdt_probe()
104 		return -ENOMEM;  in msc313e_wdt_probe()
106 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in msc313e_wdt_probe()
107 	if (IS_ERR(priv->base))  in msc313e_wdt_probe()
108 		return PTR_ERR(priv->base);  in msc313e_wdt_probe()
110 	priv->clk = devm_clk_get(dev, NULL);  in msc313e_wdt_probe()
111 	if (IS_ERR(priv->clk)) {  in msc313e_wdt_probe()
113 		return PTR_ERR(priv->clk);  in msc313e_wdt_probe()
116 	priv->wdev.info = &msc313e_wdt_ident,  in msc313e_wdt_probe()
117 	priv->wdev.ops = &msc313e_wdt_ops,  in msc313e_wdt_probe()
118 	priv->wdev.parent = dev;  in msc313e_wdt_probe()
119 	priv->wdev.min_timeout = MSC313E_WDT_MIN_TIMEOUT;  in msc313e_wdt_probe()
120 	priv->wdev.max_timeout = U32_MAX / clk_get_rate(priv->clk);  in msc313e_wdt_probe()
121 	priv->wdev.timeout = MSC313E_WDT_DEFAULT_TIMEOUT;  in msc313e_wdt_probe()
123 	/* If the period is non-zero the WDT is running */  in msc313e_wdt_probe()
124 	if (readw(priv->base + REG_WDT_MAX_PRD_L) | (readw(priv->base + REG_WDT_MAX_PRD_H) << 16))  in msc313e_wdt_probe()
125 		set_bit(WDOG_HW_RUNNING, &priv->wdev.status);  in msc313e_wdt_probe()
127 	watchdog_set_drvdata(&priv->wdev, priv);  in msc313e_wdt_probe()
129 	watchdog_init_timeout(&priv->wdev, timeout, dev);  in msc313e_wdt_probe()
130 	watchdog_stop_on_reboot(&priv->wdev);  in msc313e_wdt_probe()
131 	watchdog_stop_on_unregister(&priv->wdev);  in msc313e_wdt_probe()
133 	return devm_watchdog_register_device(dev, &priv->wdev);  in msc313e_wdt_probe()
140 	if (watchdog_active(&priv->wdev))  in msc313e_wdt_suspend()
141 		msc313e_wdt_stop(&priv->wdev);  in msc313e_wdt_suspend()
150 	if (watchdog_active(&priv->wdev))  in msc313e_wdt_resume()
151 		msc313e_wdt_start(&priv->wdev);  in msc313e_wdt_resume()
160 		.name = "msc313e-wdt",
169 MODULE_DESCRIPTION("Watchdog driver for MStar MSC313e");