1 // SPDX-License-Identifier: GPL-2.0-only
3  * Watchdog driver for Intel Keem Bay non-secure watchdog.
8 #include <linux/arm-smccc.h>
20 /* Non-secure watchdog register offsets */
47 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default = "
59 static inline u32 keembay_wdt_readl(struct keembay_wdt *wdt, u32 offset)  in keembay_wdt_readl()  argument
61 	return readl(wdt->base + offset);  in keembay_wdt_readl()
64 static inline void keembay_wdt_writel(struct keembay_wdt *wdt, u32 offset, u32 val)  in keembay_wdt_writel()  argument
66 	writel(WDT_UNLOCK, wdt->base + TIM_SAFE);  in keembay_wdt_writel()
67 	writel(val, wdt->base + offset);  in keembay_wdt_writel()
72 	struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);  in keembay_wdt_set_timeout_reg()  local
74 	keembay_wdt_writel(wdt, TIM_WATCHDOG, wdog->timeout * wdt->rate);  in keembay_wdt_set_timeout_reg()
79 	struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);  in keembay_wdt_set_pretimeout_reg()  local
82 	if (wdog->pretimeout)  in keembay_wdt_set_pretimeout_reg()
83 		th_val = wdog->timeout - wdog->pretimeout;  in keembay_wdt_set_pretimeout_reg()
85 	keembay_wdt_writel(wdt, TIM_WATCHDOG_INT_THRES, th_val * wdt->rate);  in keembay_wdt_set_pretimeout_reg()
90 	struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);  in keembay_wdt_start()  local
92 	keembay_wdt_writel(wdt, TIM_WDOG_EN, WDT_ENABLE);  in keembay_wdt_start()
99 	struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);  in keembay_wdt_stop()  local
101 	keembay_wdt_writel(wdt, TIM_WDOG_EN, WDT_DISABLE);  in keembay_wdt_stop()
115 	wdog->timeout = t;  in keembay_wdt_set_timeout()
124 	if (t > wdog->timeout)  in keembay_wdt_set_pretimeout()
125 		return -EINVAL;  in keembay_wdt_set_pretimeout()
127 	wdog->pretimeout = t;  in keembay_wdt_set_pretimeout()
135 	struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);  in keembay_wdt_get_timeleft()  local
137 	return keembay_wdt_readl(wdt, TIM_WATCHDOG) / wdt->rate;  in keembay_wdt_get_timeleft()
146 	struct keembay_wdt *wdt = dev_id;  in keembay_wdt_to_isr()  local
150 	dev_crit(wdt->wdd.parent, "Intel Keem Bay non-secure wdt timeout.\n");  in keembay_wdt_to_isr()
158 	struct keembay_wdt *wdt = dev_id;  in keembay_wdt_th_isr()  local
161 	keembay_wdt_set_pretimeout(&wdt->wdd, 0x0);  in keembay_wdt_th_isr()
164 	dev_crit(wdt->wdd.parent, "Intel Keem Bay non-secure wdt pre-timeout.\n");  in keembay_wdt_th_isr()
165 	watchdog_notify_pretimeout(&wdt->wdd);  in keembay_wdt_th_isr()
190 	struct device *dev = &pdev->dev;  in keembay_wdt_probe()
191 	struct keembay_wdt *wdt;  in keembay_wdt_probe()  local
194 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);  in keembay_wdt_probe()
195 	if (!wdt)  in keembay_wdt_probe()
196 		return -ENOMEM;  in keembay_wdt_probe()
198 	wdt->base = devm_platform_ioremap_resource(pdev, 0);  in keembay_wdt_probe()
199 	if (IS_ERR(wdt->base))  in keembay_wdt_probe()
200 		return PTR_ERR(wdt->base);  in keembay_wdt_probe()
202 	/* we do not need to enable the clock as it is enabled by default */  in keembay_wdt_probe()
203 	wdt->clk = devm_clk_get(dev, NULL);  in keembay_wdt_probe()
204 	if (IS_ERR(wdt->clk))  in keembay_wdt_probe()
205 		return dev_err_probe(dev, PTR_ERR(wdt->clk), "Failed to get clock\n");  in keembay_wdt_probe()
207 	wdt->rate = clk_get_rate(wdt->clk);  in keembay_wdt_probe()
208 	if (!wdt->rate)  in keembay_wdt_probe()
209 		return dev_err_probe(dev, -EINVAL, "Failed to get clock rate\n");  in keembay_wdt_probe()
211 	wdt->th_irq = platform_get_irq_byname(pdev, "threshold");  in keembay_wdt_probe()
212 	if (wdt->th_irq < 0)  in keembay_wdt_probe()
213 		return dev_err_probe(dev, wdt->th_irq, "Failed to get IRQ for threshold\n");  in keembay_wdt_probe()
215 	ret = devm_request_irq(dev, wdt->th_irq, keembay_wdt_th_isr, 0,  in keembay_wdt_probe()
216 			       "keembay-wdt", wdt);  in keembay_wdt_probe()
220 	wdt->to_irq = platform_get_irq_byname(pdev, "timeout");  in keembay_wdt_probe()
221 	if (wdt->to_irq < 0)  in keembay_wdt_probe()
222 		return dev_err_probe(dev, wdt->to_irq, "Failed to get IRQ for timeout\n");  in keembay_wdt_probe()
224 	ret = devm_request_irq(dev, wdt->to_irq, keembay_wdt_to_isr, 0,  in keembay_wdt_probe()
225 			       "keembay-wdt", wdt);  in keembay_wdt_probe()
229 	wdt->wdd.parent		= dev;  in keembay_wdt_probe()
230 	wdt->wdd.info		= &keembay_wdt_info;  in keembay_wdt_probe()
231 	wdt->wdd.ops		= &keembay_wdt_ops;  in keembay_wdt_probe()
232 	wdt->wdd.min_timeout	= WDT_LOAD_MIN;  in keembay_wdt_probe()
233 	wdt->wdd.max_timeout	= WDT_LOAD_MAX / wdt->rate;  in keembay_wdt_probe()
234 	wdt->wdd.timeout	= WDT_TIMEOUT;  in keembay_wdt_probe()
235 	wdt->wdd.pretimeout	= WDT_PRETIMEOUT;  in keembay_wdt_probe()
237 	watchdog_set_drvdata(&wdt->wdd, wdt);  in keembay_wdt_probe()
238 	watchdog_set_nowayout(&wdt->wdd, nowayout);  in keembay_wdt_probe()
239 	watchdog_init_timeout(&wdt->wdd, timeout, dev);  in keembay_wdt_probe()
240 	keembay_wdt_set_timeout(&wdt->wdd, wdt->wdd.timeout);  in keembay_wdt_probe()
241 	keembay_wdt_set_pretimeout(&wdt->wdd, wdt->wdd.pretimeout);  in keembay_wdt_probe()
243 	ret = devm_watchdog_register_device(dev, &wdt->wdd);  in keembay_wdt_probe()
247 	platform_set_drvdata(pdev, wdt);  in keembay_wdt_probe()
249 		 wdt->wdd.timeout, nowayout ? ", nowayout" : "");  in keembay_wdt_probe()
256 	struct keembay_wdt *wdt = dev_get_drvdata(dev);  in keembay_wdt_suspend()  local
258 	if (watchdog_active(&wdt->wdd))  in keembay_wdt_suspend()
259 		return keembay_wdt_stop(&wdt->wdd);  in keembay_wdt_suspend()
266 	struct keembay_wdt *wdt = dev_get_drvdata(dev);  in keembay_wdt_resume()  local
268 	if (watchdog_active(&wdt->wdd))  in keembay_wdt_resume()
269 		return keembay_wdt_start(&wdt->wdd);  in keembay_wdt_resume()
278 	{ .compatible = "intel,keembay-wdt" },