1 // SPDX-License-Identifier: GPL-2.0
21 #define NPCM_WTIS	(BIT(4) | BIT(5))	/* Interval selection */
57 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);  in npcm_wdt_ping()  local
60 	val = readl(wdt->reg);  in npcm_wdt_ping()
61 	writel(val | NPCM_WTR, wdt->reg);  in npcm_wdt_ping()
68 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);  in npcm_wdt_start()  local
71 	if (wdt->clk)  in npcm_wdt_start()
72 		clk_prepare_enable(wdt->clk);  in npcm_wdt_start()
74 	if (wdd->timeout < 2)  in npcm_wdt_start()
76 	else if (wdd->timeout < 3)  in npcm_wdt_start()
78 	else if (wdd->timeout < 6)  in npcm_wdt_start()
80 	else if (wdd->timeout < 11)  in npcm_wdt_start()
82 	else if (wdd->timeout < 22)  in npcm_wdt_start()
84 	else if (wdd->timeout < 44)  in npcm_wdt_start()
86 	else if (wdd->timeout < 87)  in npcm_wdt_start()
88 	else if (wdd->timeout < 173)  in npcm_wdt_start()
90 	else if (wdd->timeout < 688)  in npcm_wdt_start()
97 	writel(val, wdt->reg);  in npcm_wdt_start()
104 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);  in npcm_wdt_stop()  local
106 	writel(0, wdt->reg);  in npcm_wdt_stop()
108 	if (wdt->clk)  in npcm_wdt_stop()
109 		clk_disable_unprepare(wdt->clk);  in npcm_wdt_stop()
118 		wdd->timeout = 1;  in npcm_wdt_set_timeout()
120 		wdd->timeout = 2;  in npcm_wdt_set_timeout()
122 		wdd->timeout = 5;  in npcm_wdt_set_timeout()
124 		wdd->timeout = 10;  in npcm_wdt_set_timeout()
126 		wdd->timeout = 21;  in npcm_wdt_set_timeout()
128 		wdd->timeout = 43;  in npcm_wdt_set_timeout()
130 		wdd->timeout = 86;  in npcm_wdt_set_timeout()
132 		wdd->timeout = 172;  in npcm_wdt_set_timeout()
134 		wdd->timeout = 687;  in npcm_wdt_set_timeout()
136 		wdd->timeout = 2750;  in npcm_wdt_set_timeout()
146 	struct npcm_wdt *wdt = data;  in npcm_wdt_interrupt()  local
148 	watchdog_notify_pretimeout(&wdt->wdd);  in npcm_wdt_interrupt()
156 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);  in npcm_wdt_restart()  local
158 	/* For reset, we start the WDT clock and leave it running. */  in npcm_wdt_restart()
159 	if (wdt->clk)  in npcm_wdt_restart()
160 		clk_prepare_enable(wdt->clk);  in npcm_wdt_restart()
162 	writel(NPCM_WTR | NPCM_WTRE | NPCM_WTE, wdt->reg);  in npcm_wdt_restart()
170 	struct npcm_wdt *wdt = to_npcm_wdt(wdd);  in npcm_is_running()  local
172 	return readl(wdt->reg) & NPCM_WTE;  in npcm_is_running()
193 	struct device *dev = &pdev->dev;  in npcm_wdt_probe()
194 	struct npcm_wdt *wdt;  in npcm_wdt_probe()  local
198 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);  in npcm_wdt_probe()
199 	if (!wdt)  in npcm_wdt_probe()
200 		return -ENOMEM;  in npcm_wdt_probe()
202 	wdt->reg = devm_platform_ioremap_resource(pdev, 0);  in npcm_wdt_probe()
203 	if (IS_ERR(wdt->reg))  in npcm_wdt_probe()
204 		return PTR_ERR(wdt->reg);  in npcm_wdt_probe()
206 	wdt->clk = devm_clk_get_optional(&pdev->dev, NULL);  in npcm_wdt_probe()
207 	if (IS_ERR(wdt->clk))  in npcm_wdt_probe()
208 		return PTR_ERR(wdt->clk);  in npcm_wdt_probe()
214 	wdt->wdd.info = &npcm_wdt_info;  in npcm_wdt_probe()
215 	wdt->wdd.ops = &npcm_wdt_ops;  in npcm_wdt_probe()
216 	wdt->wdd.min_timeout = 1;  in npcm_wdt_probe()
217 	wdt->wdd.max_timeout = 2750;  in npcm_wdt_probe()
218 	wdt->wdd.parent = dev;  in npcm_wdt_probe()
220 	wdt->wdd.timeout = 86;  in npcm_wdt_probe()
221 	watchdog_init_timeout(&wdt->wdd, 0, dev);  in npcm_wdt_probe()
224 	npcm_wdt_set_timeout(&wdt->wdd, wdt->wdd.timeout);  in npcm_wdt_probe()
226 	if (npcm_is_running(&wdt->wdd)) {  in npcm_wdt_probe()
227 		/* Restart with the default or device-tree specified timeout */  in npcm_wdt_probe()
228 		npcm_wdt_start(&wdt->wdd);  in npcm_wdt_probe()
229 		set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);  in npcm_wdt_probe()
233 			       wdt);  in npcm_wdt_probe()
237 	ret = devm_watchdog_register_device(dev, &wdt->wdd);  in npcm_wdt_probe()
248 	{.compatible = "nuvoton,wpcm450-wdt"},
249 	{.compatible = "nuvoton,npcm750-wdt"},
258 		.name	= "npcm-wdt",