51 #define wdt_enabled (!(wdt->mr & AT91_WDT_WDDIS))
53 #define wdt_read(wdt, field) \  argument
54 	readl_relaxed((wdt)->reg_base + (field))
59 static void wdt_write(struct sama5d4_wdt *wdt, u32 field, u32 val)  in wdt_write()  argument
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()
72 static void wdt_write_nosleep(struct sama5d4_wdt *wdt, u32 field, u32 val)  in wdt_write_nosleep()  argument
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()
82 	struct sama5d4_wdt *wdt = watchdog_get_drvdata(wdd);  in sama5d4_wdt_start()  local
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()
97 	struct sama5d4_wdt *wdt = watchdog_get_drvdata(wdd);  in sama5d4_wdt_stop()  local
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()
112 	struct sama5d4_wdt *wdt = watchdog_get_drvdata(wdd);  in sama5d4_wdt_ping()  local
114 	wdt_write(wdt, AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);  in sama5d4_wdt_ping()
122 	struct sama5d4_wdt *wdt = watchdog_get_drvdata(wdd);  in sama5d4_wdt_set_timeout()  local
125 	if (wdt->sam9x60_support) {  in sama5d4_wdt_set_timeout()
126 		wdt_write(wdt, AT91_SAM9X60_WLR,  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()
166 	struct sama5d4_wdt *wdt = platform_get_drvdata(dev_id);  in sama5d4_wdt_irq_handler()  local
169 	if (wdt->sam9x60_support)  in sama5d4_wdt_irq_handler()
170 		reg = wdt_read(wdt, AT91_SAM9X60_ISR);  in sama5d4_wdt_irq_handler()
172 		reg = wdt_read(wdt, AT91_WDT_SR);  in sama5d4_wdt_irq_handler()
183 static int of_sama5d4_wdt_init(struct device_node *np, struct sama5d4_wdt *wdt)  in of_sama5d4_wdt_init()  argument
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()
194 		wdt->need_irq = true;  in of_sama5d4_wdt_init()
197 		wdt->mr |= AT91_WDT_WDIDLEHLT;  in of_sama5d4_wdt_init()
200 		wdt->mr |= AT91_WDT_WDDBGHLT;  in of_sama5d4_wdt_init()
205 static int sama5d4_wdt_init(struct sama5d4_wdt *wdt)  in sama5d4_wdt_init()  argument
217 		reg = wdt_read(wdt, AT91_WDT_MR);  in sama5d4_wdt_init()
218 		if (wdt->sam9x60_support && (!(reg & AT91_SAM9X60_WDDIS)))  in sama5d4_wdt_init()
219 			wdt_write_nosleep(wdt, AT91_WDT_MR,  in sama5d4_wdt_init()
221 		else if (!wdt->sam9x60_support &&  in sama5d4_wdt_init()
223 			wdt_write_nosleep(wdt, AT91_WDT_MR,  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()
234 		wdt_write(wdt, AT91_SAM9X60_WLR, AT91_SAM9X60_SET_COUNTER(val));  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()
254 	struct sama5d4_wdt *wdt;  in sama5d4_wdt_probe()  local
260 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);  in sama5d4_wdt_probe()
261 	if (!wdt)  in sama5d4_wdt_probe()
264 	wdd = &wdt->wdd;  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()
276 	watchdog_set_drvdata(wdd, wdt);  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()
292 			wdt->need_irq = false;  in sama5d4_wdt_probe()
296 	if (wdt->need_irq) {  in sama5d4_wdt_probe()
308 	reg = wdt_read(wdt, AT91_WDT_MR);  in sama5d4_wdt_probe()
310 		wdt->mr &= ~AT91_WDT_WDDIS;  in sama5d4_wdt_probe()
314 	ret = sama5d4_wdt_init(wdt);  in sama5d4_wdt_probe()
325 	platform_set_drvdata(pdev, wdt);  in sama5d4_wdt_probe()
335 		.compatible = "atmel,sama5d4-wdt",
338 		.compatible = "microchip,sam9x60-wdt",
341 		.compatible = "microchip,sama7g5-wdt",
350 	struct sama5d4_wdt *wdt = dev_get_drvdata(dev);  in sama5d4_wdt_suspend_late()  local
352 	if (watchdog_active(&wdt->wdd))  in sama5d4_wdt_suspend_late()
353 		sama5d4_wdt_stop(&wdt->wdd);  in sama5d4_wdt_suspend_late()
360 	struct sama5d4_wdt *wdt = dev_get_drvdata(dev);  in sama5d4_wdt_resume_early()  local
367 	sama5d4_wdt_init(wdt);  in sama5d4_wdt_resume_early()
369 	if (watchdog_active(&wdt->wdd))  in sama5d4_wdt_resume_early()
370 		sama5d4_wdt_start(&wdt->wdd);  in sama5d4_wdt_resume_early()