1 // SPDX-License-Identifier: GPL-2.0-only
11  * -----
25  * The following table shows how the user-configured timeout relates
29  * -----------------------------------
79 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
91 	struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);  in pdc_wdt_keepalive()  local
93 	writel(PDC_WDT_TICKLE1_MAGIC, wdt->base + PDC_WDT_TICKLE1);  in pdc_wdt_keepalive()
94 	writel(PDC_WDT_TICKLE2_MAGIC, wdt->base + PDC_WDT_TICKLE2);  in pdc_wdt_keepalive()
102 	struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);  in pdc_wdt_stop()  local
104 	val = readl(wdt->base + PDC_WDT_CONFIG);  in pdc_wdt_stop()
106 	writel(val, wdt->base + PDC_WDT_CONFIG);  in pdc_wdt_stop()
114 static void __pdc_wdt_set_timeout(struct pdc_wdt_dev *wdt)  in __pdc_wdt_set_timeout()  argument
116 	unsigned long clk_rate = clk_get_rate(wdt->wdt_clk);  in __pdc_wdt_set_timeout()
119 	val = readl(wdt->base + PDC_WDT_CONFIG) & ~PDC_WDT_CONFIG_DELAY_MASK;  in __pdc_wdt_set_timeout()
120 	val |= order_base_2(wdt->wdt_dev.timeout * clk_rate) - 1;  in __pdc_wdt_set_timeout()
121 	writel(val, wdt->base + PDC_WDT_CONFIG);  in __pdc_wdt_set_timeout()
127 	struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);  in pdc_wdt_set_timeout()  local
129 	wdt->wdt_dev.timeout = new_timeout;  in pdc_wdt_set_timeout()
131 	__pdc_wdt_set_timeout(wdt);  in pdc_wdt_set_timeout()
140 	struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);  in pdc_wdt_start()  local
142 	__pdc_wdt_set_timeout(wdt);  in pdc_wdt_start()
144 	val = readl(wdt->base + PDC_WDT_CONFIG);  in pdc_wdt_start()
146 	writel(val, wdt->base + PDC_WDT_CONFIG);  in pdc_wdt_start()
154 	struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);  in pdc_wdt_restart()  local
157 	writel(0x1, wdt->base + PDC_WDT_SOFT_RESET);  in pdc_wdt_restart()
185 	struct device *dev = &pdev->dev;  in pdc_wdt_probe()
193 		return -ENOMEM;  in pdc_wdt_probe()
195 	pdc_wdt->base = devm_platform_ioremap_resource(pdev, 0);  in pdc_wdt_probe()
196 	if (IS_ERR(pdc_wdt->base))  in pdc_wdt_probe()
197 		return PTR_ERR(pdc_wdt->base);  in pdc_wdt_probe()
199 	pdc_wdt->sys_clk = devm_clk_get(dev, "sys");  in pdc_wdt_probe()
200 	if (IS_ERR(pdc_wdt->sys_clk)) {  in pdc_wdt_probe()
202 		return PTR_ERR(pdc_wdt->sys_clk);  in pdc_wdt_probe()
205 	pdc_wdt->wdt_clk = devm_clk_get(dev, "wdt");  in pdc_wdt_probe()
206 	if (IS_ERR(pdc_wdt->wdt_clk)) {  in pdc_wdt_probe()
207 		dev_err(dev, "failed to get the wdt clock\n");  in pdc_wdt_probe()
208 		return PTR_ERR(pdc_wdt->wdt_clk);  in pdc_wdt_probe()
211 	ret = clk_prepare_enable(pdc_wdt->sys_clk);  in pdc_wdt_probe()
213 		dev_err(dev, "could not prepare or enable sys clock\n");  in pdc_wdt_probe()
217 				       pdc_wdt->sys_clk);  in pdc_wdt_probe()
221 	ret = clk_prepare_enable(pdc_wdt->wdt_clk);  in pdc_wdt_probe()
223 		dev_err(dev, "could not prepare or enable wdt clock\n");  in pdc_wdt_probe()
227 				       pdc_wdt->wdt_clk);  in pdc_wdt_probe()
232 	clk_rate = clk_get_rate(pdc_wdt->wdt_clk);  in pdc_wdt_probe()
235 		return -EINVAL;  in pdc_wdt_probe()
240 		return -EINVAL;  in pdc_wdt_probe()
244 		pdc_wdt->wdt_dev.min_timeout = PDC_WDT_MIN_TIMEOUT + 1;  in pdc_wdt_probe()
246 		pdc_wdt->wdt_dev.min_timeout = PDC_WDT_MIN_TIMEOUT;  in pdc_wdt_probe()
248 	pdc_wdt->wdt_dev.info = &pdc_wdt_info;  in pdc_wdt_probe()
249 	pdc_wdt->wdt_dev.ops = &pdc_wdt_ops;  in pdc_wdt_probe()
253 	pdc_wdt->wdt_dev.max_timeout = div;  in pdc_wdt_probe()
254 	pdc_wdt->wdt_dev.timeout = PDC_WDT_DEF_TIMEOUT;  in pdc_wdt_probe()
255 	pdc_wdt->wdt_dev.parent = dev;  in pdc_wdt_probe()
256 	watchdog_set_drvdata(&pdc_wdt->wdt_dev, pdc_wdt);  in pdc_wdt_probe()
258 	watchdog_init_timeout(&pdc_wdt->wdt_dev, heartbeat, dev);  in pdc_wdt_probe()
260 	pdc_wdt_stop(&pdc_wdt->wdt_dev);  in pdc_wdt_probe()
263 	val = readl(pdc_wdt->base + PDC_WDT_TICKLE1);  in pdc_wdt_probe()
268 		pdc_wdt->wdt_dev.bootstatus |= WDIOF_CARDRESET;  in pdc_wdt_probe()
288 	watchdog_set_nowayout(&pdc_wdt->wdt_dev, nowayout);  in pdc_wdt_probe()
289 	watchdog_set_restart_priority(&pdc_wdt->wdt_dev, 128);  in pdc_wdt_probe()
293 	watchdog_stop_on_reboot(&pdc_wdt->wdt_dev);  in pdc_wdt_probe()
294 	watchdog_stop_on_unregister(&pdc_wdt->wdt_dev);  in pdc_wdt_probe()
295 	return devm_watchdog_register_device(dev, &pdc_wdt->wdt_dev);  in pdc_wdt_probe()
299 	{ .compatible = "img,pdc-wdt" },
306 		.name = "imgpdc-wdt",