1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2015-2019 Microchip Technology Inc. and its subsidiaries
26 #define WDT_SEC2TICKS(s)	((s) ? (((s) << 8) - 1) : 0)
51 #define wdt_enabled (!(wdt->mr & AT91_WDT_WDDIS))
54 	readl_relaxed((wdt)->reg_base + (field))
66 	while (time_before(jiffies, wdt->last_ping + WDT_DELAY))  in wdt_write()
68 	writel_relaxed(val, wdt->reg_base + field);  in wdt_write()
69 	wdt->last_ping = jiffies;  in wdt_write()
74 	if (time_before(jiffies, wdt->last_ping + WDT_DELAY))  in wdt_write_nosleep()
76 	writel_relaxed(val, wdt->reg_base + field);  in wdt_write_nosleep()
77 	wdt->last_ping = jiffies;  in wdt_write_nosleep()
84 	if (wdt->sam9x60_support) {  in sama5d4_wdt_start()
85 		writel_relaxed(wdt->ir, wdt->reg_base + AT91_SAM9X60_IER);  in sama5d4_wdt_start()
86 		wdt->mr &= ~AT91_SAM9X60_WDDIS;  in sama5d4_wdt_start()
88 		wdt->mr &= ~AT91_WDT_WDDIS;  in sama5d4_wdt_start()
90 	wdt_write(wdt, AT91_WDT_MR, wdt->mr);  in sama5d4_wdt_start()
99 	if (wdt->sam9x60_support) {  in sama5d4_wdt_stop()
100 		writel_relaxed(wdt->ir, wdt->reg_base + AT91_SAM9X60_IDR);  in sama5d4_wdt_stop()
101 		wdt->mr |= AT91_SAM9X60_WDDIS;  in sama5d4_wdt_stop()
103 		wdt->mr |= AT91_WDT_WDDIS;  in sama5d4_wdt_stop()
105 	wdt_write(wdt, AT91_WDT_MR, wdt->mr);  in sama5d4_wdt_stop()
125 	if (wdt->sam9x60_support) {  in sama5d4_wdt_set_timeout()
129 		wdd->timeout = timeout;  in sama5d4_wdt_set_timeout()
133 	wdt->mr &= ~AT91_WDT_WDV;  in sama5d4_wdt_set_timeout()
134 	wdt->mr |= AT91_WDT_SET_WDV(value);  in sama5d4_wdt_set_timeout()
144 		wdt_write(wdt, AT91_WDT_MR, wdt->mr & ~AT91_WDT_WDDIS);  in sama5d4_wdt_set_timeout()
146 	wdd->timeout = timeout;  in sama5d4_wdt_set_timeout()
169 	if (wdt->sam9x60_support)  in sama5d4_wdt_irq_handler()
187 	if (wdt->sam9x60_support)  in of_sama5d4_wdt_init()
188 		wdt->mr = AT91_SAM9X60_WDDIS;  in of_sama5d4_wdt_init()
190 		wdt->mr = AT91_WDT_WDDIS;  in of_sama5d4_wdt_init()
192 	if (!of_property_read_string(np, "atmel,watchdog-type", &tmp) &&  in of_sama5d4_wdt_init()
194 		wdt->need_irq = true;  in of_sama5d4_wdt_init()
196 	if (of_property_read_bool(np, "atmel,idle-halt"))  in of_sama5d4_wdt_init()
197 		wdt->mr |= AT91_WDT_WDIDLEHLT;  in of_sama5d4_wdt_init()
199 	if (of_property_read_bool(np, "atmel,dbg-halt"))  in of_sama5d4_wdt_init()
200 		wdt->mr |= AT91_WDT_WDDBGHLT;  in of_sama5d4_wdt_init()
218 		if (wdt->sam9x60_support && (!(reg & AT91_SAM9X60_WDDIS)))  in sama5d4_wdt_init()
221 		else if (!wdt->sam9x60_support &&  in sama5d4_wdt_init()
227 	if (wdt->sam9x60_support) {  in sama5d4_wdt_init()
228 		if (wdt->need_irq)  in sama5d4_wdt_init()
229 			wdt->ir = AT91_SAM9X60_PERINT;  in sama5d4_wdt_init()
231 			wdt->mr |= AT91_SAM9X60_PERIODRST;  in sama5d4_wdt_init()
233 		wdt_write(wdt, AT91_SAM9X60_IER, wdt->ir);  in sama5d4_wdt_init()
236 		wdt->mr |= AT91_WDT_SET_WDD(WDT_SEC2TICKS(MAX_WDT_TIMEOUT));  in sama5d4_wdt_init()
237 		wdt->mr |= AT91_WDT_SET_WDV(val);  in sama5d4_wdt_init()
239 		if (wdt->need_irq)  in sama5d4_wdt_init()
240 			wdt->mr |= AT91_WDT_WDFIEN;  in sama5d4_wdt_init()
242 			wdt->mr |= AT91_WDT_WDRSTEN;  in sama5d4_wdt_init()
245 	wdt_write_nosleep(wdt, AT91_WDT_MR, wdt->mr);  in sama5d4_wdt_init()
252 	struct device *dev = &pdev->dev;  in sama5d4_wdt_probe()
262 		return -ENOMEM;  in sama5d4_wdt_probe()
264 	wdd = &wdt->wdd;  in sama5d4_wdt_probe()
265 	wdd->timeout = WDT_DEFAULT_TIMEOUT;  in sama5d4_wdt_probe()
266 	wdd->info = &sama5d4_wdt_info;  in sama5d4_wdt_probe()
267 	wdd->ops = &sama5d4_wdt_ops;  in sama5d4_wdt_probe()
268 	wdd->min_timeout = MIN_WDT_TIMEOUT;  in sama5d4_wdt_probe()
269 	wdd->max_timeout = MAX_WDT_TIMEOUT;  in sama5d4_wdt_probe()
270 	wdt->last_ping = jiffies;  in sama5d4_wdt_probe()
272 	if (of_device_is_compatible(dev->of_node, "microchip,sam9x60-wdt") ||  in sama5d4_wdt_probe()
273 	    of_device_is_compatible(dev->of_node, "microchip,sama7g5-wdt"))  in sama5d4_wdt_probe()
274 		wdt->sam9x60_support = true;  in sama5d4_wdt_probe()
282 	wdt->reg_base = regs;  in sama5d4_wdt_probe()
284 	ret = of_sama5d4_wdt_init(dev->of_node, wdt);  in sama5d4_wdt_probe()
288 	if (wdt->need_irq) {  in sama5d4_wdt_probe()
289 		irq = irq_of_parse_and_map(dev->of_node, 0);  in sama5d4_wdt_probe()
292 			wdt->need_irq = false;  in sama5d4_wdt_probe()
296 	if (wdt->need_irq) {  in sama5d4_wdt_probe()
299 				       IRQF_NO_SUSPEND, pdev->name, pdev);  in sama5d4_wdt_probe()
310 		wdt->mr &= ~AT91_WDT_WDDIS;  in sama5d4_wdt_probe()
311 		set_bit(WDOG_HW_RUNNING, &wdd->status);  in sama5d4_wdt_probe()
328 		 wdd->timeout, nowayout);  in sama5d4_wdt_probe()
335 		.compatible = "atmel,sama5d4-wdt",
338 		.compatible = "microchip,sam9x60-wdt",
341 		.compatible = "microchip,sama7g5-wdt",
352 	if (watchdog_active(&wdt->wdd))  in sama5d4_wdt_suspend_late()
353 		sama5d4_wdt_stop(&wdt->wdd);  in sama5d4_wdt_suspend_late()
369 	if (watchdog_active(&wdt->wdd))  in sama5d4_wdt_resume_early()
370 		sama5d4_wdt_start(&wdt->wdd);  in sama5d4_wdt_resume_early()