1 // SPDX-License-Identifier: GPL-2.0
5  * Watchdog driver for the TI OMAP 16xx & 24xx/34xx 32KHz (non-secure) watchdog
15  *	Initially based on linux-2.4.19-rmk7-pxa1/drivers/char/sa1100_wdt.c
20  *	1. Modified to support OMAP1610 32-KHz watchdog timer
42 #include <linux/platform_data/omap-wd-timer.h>
73 	void __iomem    *base = wdev->base;  in omap_wdt_reload()
79 	wdev->wdt_trgr_pattern = ~wdev->wdt_trgr_pattern;  in omap_wdt_reload()
80 	writel_relaxed(wdev->wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));  in omap_wdt_reload()
90 	void __iomem *base = wdev->base;  in omap_wdt_enable()
104 	void __iomem *base = wdev->base;  in omap_wdt_disable()
120 	void __iomem *base = wdev->base;  in omap_wdt_set_timer()
134 	void __iomem *base = wdev->base;  in omap_wdt_start()
136 	mutex_lock(&wdev->lock);  in omap_wdt_start()
138 	wdev->omap_wdt_users = true;  in omap_wdt_start()
140 	pm_runtime_get_sync(wdev->dev);  in omap_wdt_start()
157 	omap_wdt_set_timer(wdev, wdog->timeout);  in omap_wdt_start()
161 	mutex_unlock(&wdev->lock);  in omap_wdt_start()
170 	mutex_lock(&wdev->lock);  in omap_wdt_stop()
172 	pm_runtime_put_sync(wdev->dev);  in omap_wdt_stop()
173 	wdev->omap_wdt_users = false;  in omap_wdt_stop()
174 	mutex_unlock(&wdev->lock);  in omap_wdt_stop()
182 	mutex_lock(&wdev->lock);  in omap_wdt_ping()
184 	mutex_unlock(&wdev->lock);  in omap_wdt_ping()
194 	mutex_lock(&wdev->lock);  in omap_wdt_set_timeout()
199 	wdog->timeout = timeout;  in omap_wdt_set_timeout()
200 	mutex_unlock(&wdev->lock);  in omap_wdt_set_timeout()
208 	void __iomem *base = wdev->base;  in omap_wdt_get_timeleft()
231 	struct omap_wd_timer_platform_data *pdata = dev_get_platdata(&pdev->dev);  in omap_wdt_probe()
235 	wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);  in omap_wdt_probe()
237 		return -ENOMEM;  in omap_wdt_probe()
239 	wdev->omap_wdt_users	= false;  in omap_wdt_probe()
240 	wdev->dev		= &pdev->dev;  in omap_wdt_probe()
241 	wdev->wdt_trgr_pattern	= 0x1234;  in omap_wdt_probe()
242 	mutex_init(&wdev->lock);  in omap_wdt_probe()
245 	wdev->base = devm_platform_ioremap_resource(pdev, 0);  in omap_wdt_probe()
246 	if (IS_ERR(wdev->base))  in omap_wdt_probe()
247 		return PTR_ERR(wdev->base);  in omap_wdt_probe()
249 	wdev->wdog.info = &omap_wdt_info;  in omap_wdt_probe()
250 	wdev->wdog.ops = &omap_wdt_ops;  in omap_wdt_probe()
251 	wdev->wdog.min_timeout = TIMER_MARGIN_MIN;  in omap_wdt_probe()
252 	wdev->wdog.max_timeout = TIMER_MARGIN_MAX;  in omap_wdt_probe()
253 	wdev->wdog.timeout = TIMER_MARGIN_DEFAULT;  in omap_wdt_probe()
254 	wdev->wdog.parent = &pdev->dev;  in omap_wdt_probe()
256 	watchdog_init_timeout(&wdev->wdog, timer_margin, &pdev->dev);  in omap_wdt_probe()
258 	watchdog_set_nowayout(&wdev->wdog, nowayout);  in omap_wdt_probe()
262 	pm_runtime_enable(wdev->dev);  in omap_wdt_probe()
263 	pm_runtime_get_sync(wdev->dev);  in omap_wdt_probe()
265 	if (pdata && pdata->read_reset_sources) {  in omap_wdt_probe()
266 		u32 rs = pdata->read_reset_sources();  in omap_wdt_probe()
268 			wdev->wdog.bootstatus = WDIOF_CARDRESET;  in omap_wdt_probe()
272 		omap_wdt_start(&wdev->wdog);  in omap_wdt_probe()
273 		set_bit(WDOG_HW_RUNNING, &wdev->wdog.status);  in omap_wdt_probe()
278 	ret = watchdog_register_device(&wdev->wdog);  in omap_wdt_probe()
280 		pm_runtime_put(wdev->dev);  in omap_wdt_probe()
281 		pm_runtime_disable(wdev->dev);  in omap_wdt_probe()
285 	pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",  in omap_wdt_probe()
286 		readl_relaxed(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,  in omap_wdt_probe()
287 		wdev->wdog.timeout);  in omap_wdt_probe()
290 		omap_wdt_start(&wdev->wdog);  in omap_wdt_probe()
292 	pm_runtime_put(wdev->dev);  in omap_wdt_probe()
301 	mutex_lock(&wdev->lock);  in omap_wdt_shutdown()
302 	if (wdev->omap_wdt_users) {  in omap_wdt_shutdown()
304 		pm_runtime_put_sync(wdev->dev);  in omap_wdt_shutdown()
306 	mutex_unlock(&wdev->lock);  in omap_wdt_shutdown()
313 	pm_runtime_disable(wdev->dev);  in omap_wdt_remove()
314 	watchdog_unregister_device(&wdev->wdog);  in omap_wdt_remove()
327 	mutex_lock(&wdev->lock);  in omap_wdt_suspend()
328 	if (wdev->omap_wdt_users) {  in omap_wdt_suspend()
330 		pm_runtime_put_sync(wdev->dev);  in omap_wdt_suspend()
332 	mutex_unlock(&wdev->lock);  in omap_wdt_suspend()
341 	mutex_lock(&wdev->lock);  in omap_wdt_resume()
342 	if (wdev->omap_wdt_users) {  in omap_wdt_resume()
343 		pm_runtime_get_sync(wdev->dev);  in omap_wdt_resume()
347 	mutex_unlock(&wdev->lock);  in omap_wdt_resume()
353 	{ .compatible = "ti,omap3-wdt", },
373 MODULE_DESCRIPTION("Driver for the TI OMAP 16xx/24xx/34xx 32KHz (non-secure) watchdog");