43 #define wdt_read(wdt, field) \  argument
44 	readl_relaxed((wdt)->base + (field))
46 	writel_relaxed((val), (wdt)->base + (field))
101 	struct at91wdt *wdt = (struct at91wdt *)dev_id;  in wdt_interrupt()  local
103 	if (wdt_read(wdt, AT91_WDT_SR)) {  in wdt_interrupt()
115 static inline void at91_wdt_reset(struct at91wdt *wdt)  in at91_wdt_reset()  argument
117 	wdt_write(wdt, AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);  in at91_wdt_reset()
125 	struct at91wdt *wdt = (struct at91wdt *)data;  in at91_ping()  local
126 	if (time_before(jiffies, wdt->next_heartbeat) ||  in at91_ping()
127 	    !watchdog_active(&wdt->wdd)) {  in at91_ping()
128 		at91_wdt_reset(wdt);  in at91_ping()
129 		mod_timer(&wdt->timer, jiffies + wdt->heartbeat);  in at91_ping()
137 	struct at91wdt *wdt = to_wdt(wdd);  in at91_wdt_start()  local
139 	wdt->next_heartbeat = jiffies + wdd->timeout * HZ;  in at91_wdt_start()
155 static int at91_wdt_init(struct platform_device *pdev, struct at91wdt *wdt)  in at91_wdt_init()  argument
161 	u32 mask = wdt->mr_mask;  in at91_wdt_init()
166 	tmp = wdt_read(wdt, AT91_WDT_MR);  in at91_wdt_init()
167 	if ((tmp & mask) != (wdt->mr & mask)) {  in at91_wdt_init()
169 			wdt_write(wdt, AT91_WDT_MR, wdt->mr);  in at91_wdt_init()
170 			tmp = wdt_read(wdt, AT91_WDT_MR);  in at91_wdt_init()
175 		if (wdt->mr & AT91_WDT_WDDIS)  in at91_wdt_init()
201 		wdt->heartbeat = max_heartbeat / 4;  in at91_wdt_init()
203 		wdt->heartbeat = max_heartbeat / 2;  in at91_wdt_init()
205 		wdt->heartbeat = min_heartbeat;  in at91_wdt_init()
211 	if ((tmp & AT91_WDT_WDFIEN) && wdt->irq) {  in at91_wdt_init()
212 		err = request_irq(wdt->irq, wdt_interrupt,  in at91_wdt_init()
215 				  pdev->name, wdt);  in at91_wdt_init()
220 	if ((tmp & wdt->mr_mask) != (wdt->mr & wdt->mr_mask))  in at91_wdt_init()
223 			 tmp & wdt->mr_mask, wdt->mr & wdt->mr_mask);  in at91_wdt_init()
225 	setup_timer(&wdt->timer, at91_ping, (unsigned long)wdt);  in at91_wdt_init()
234 	mod_timer(&wdt->timer, jiffies + min_heartbeat);  in at91_wdt_init()
237 	if (watchdog_init_timeout(&wdt->wdd, 0, dev))  in at91_wdt_init()
238 		watchdog_init_timeout(&wdt->wdd, heartbeat, dev);  in at91_wdt_init()
239 	watchdog_set_nowayout(&wdt->wdd, wdt->nowayout);  in at91_wdt_init()
240 	err = watchdog_register_device(&wdt->wdd);  in at91_wdt_init()
244 	wdt->next_heartbeat = jiffies + wdt->wdd.timeout * HZ;  in at91_wdt_init()
249 	del_timer(&wdt->timer);  in at91_wdt_init()
269 static int of_at91wdt_init(struct device_node *np, struct at91wdt *wdt)  in of_at91wdt_init()  argument
276 	wdt->irq = irq_of_parse_and_map(np, 0);  in of_at91wdt_init()
277 	if (!wdt->irq)  in of_at91wdt_init()
278 		dev_warn(wdt->wdd.parent, "failed to get IRQ from DT\n");  in of_at91wdt_init()
295 	wdt->mr_mask = 0x3FFFFFFF;  in of_at91wdt_init()
296 	wdt->mr = 0;  in of_at91wdt_init()
299 		wdt->mr |= AT91_WDT_WDFIEN;  in of_at91wdt_init()
300 		wdt->mr_mask &= ~AT91_WDT_WDRPROC;  in of_at91wdt_init()
302 		wdt->mr |= AT91_WDT_WDRSTEN;  in of_at91wdt_init()
307 		wdt->mr |= AT91_WDT_WDRPROC;  in of_at91wdt_init()
310 		wdt->mr |= AT91_WDT_WDDIS;  in of_at91wdt_init()
311 		wdt->mr_mask &= AT91_WDT_WDDIS;  in of_at91wdt_init()
315 		wdt->mr |= AT91_WDT_WDIDLEHLT;  in of_at91wdt_init()
318 		wdt->mr |= AT91_WDT_WDDBGHLT;  in of_at91wdt_init()
320 	wdt->mr |= max | ((max - min) << 16);  in of_at91wdt_init()
325 static inline int of_at91wdt_init(struct device_node *np, struct at91wdt *wdt)  in of_at91wdt_init()  argument
335 	struct at91wdt *wdt;  in at91wdt_probe()  local
337 	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);  in at91wdt_probe()
338 	if (!wdt)  in at91wdt_probe()
341 	wdt->mr = (WDT_HW_TIMEOUT * 256) | AT91_WDT_WDRSTEN | AT91_WDT_WDD |  in at91wdt_probe()
343 	wdt->mr_mask = 0x3FFFFFFF;  in at91wdt_probe()
344 	wdt->nowayout = nowayout;  in at91wdt_probe()
345 	wdt->wdd.parent = &pdev->dev;  in at91wdt_probe()
346 	wdt->wdd.info = &at91_wdt_info;  in at91wdt_probe()
347 	wdt->wdd.ops = &at91_wdt_ops;  in at91wdt_probe()
348 	wdt->wdd.timeout = WDT_HEARTBEAT;  in at91wdt_probe()
349 	wdt->wdd.min_timeout = 1;  in at91wdt_probe()
350 	wdt->wdd.max_timeout = 0xFFFF;  in at91wdt_probe()
353 	wdt->base = devm_ioremap_resource(&pdev->dev, r);  in at91wdt_probe()
354 	if (IS_ERR(wdt->base))  in at91wdt_probe()
355 		return PTR_ERR(wdt->base);  in at91wdt_probe()
357 	wdt->sclk = devm_clk_get(&pdev->dev, NULL);  in at91wdt_probe()
358 	if (IS_ERR(wdt->sclk))  in at91wdt_probe()
359 		return PTR_ERR(wdt->sclk);  in at91wdt_probe()
361 	err = clk_prepare_enable(wdt->sclk);  in at91wdt_probe()
368 		err = of_at91wdt_init(pdev->dev.of_node, wdt);  in at91wdt_probe()
373 	err = at91_wdt_init(pdev, wdt);  in at91wdt_probe()
377 	platform_set_drvdata(pdev, wdt);  in at91wdt_probe()
380 		wdt->wdd.timeout, wdt->nowayout);  in at91wdt_probe()
385 	clk_disable_unprepare(wdt->sclk);  in at91wdt_probe()
392 	struct at91wdt *wdt = platform_get_drvdata(pdev);  in at91wdt_remove()  local
393 	watchdog_unregister_device(&wdt->wdd);  in at91wdt_remove()
396 	del_timer(&wdt->timer);  in at91wdt_remove()
397 	clk_disable_unprepare(wdt->sclk);  in at91wdt_remove()