1 // SPDX-License-Identifier: GPL-2.0-only
3  * Ralink MT7621/MT7628 built-in hardware watchdog timer
38 	struct watchdog_device wdt;  member
44 		 "Watchdog cannot be stopped once started (default="
61 	rt_wdt_w32(drvdata->base, TIMER_REG_TMRSTAT, TMR1CTL_RESTART);  in mt7621_wdt_ping()
70 	w->timeout = t;  in mt7621_wdt_set_timeout()
71 	rt_wdt_w32(drvdata->base, TIMER_REG_TMR1LOAD, t * 1000);  in mt7621_wdt_set_timeout()
83 	rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, 1000 << TMR1CTL_PRESCALE_SHIFT);  in mt7621_wdt_start()
85 	mt7621_wdt_set_timeout(w, w->timeout);  in mt7621_wdt_start()
87 	t = rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL);  in mt7621_wdt_start()
89 	rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, t);  in mt7621_wdt_start()
101 	t = rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL);  in mt7621_wdt_stop()
103 	rt_wdt_w32(drvdata->base, TIMER_REG_TMR1CTL, t);  in mt7621_wdt_stop()
112 	regmap_read(d->sysc, SYSC_RSTSTAT, &val);  in mt7621_wdt_bootcause()
123 	return !!(rt_wdt_r32(drvdata->base, TIMER_REG_TMR1CTL) & TMR1CTL_ENABLE);  in mt7621_wdt_is_running()
141 	struct device_node *np = pdev->dev.of_node;  in mt7621_wdt_probe()
142 	struct device *dev = &pdev->dev;  in mt7621_wdt_probe()
149 		return -ENOMEM;  in mt7621_wdt_probe()
151 	drvdata->sysc = syscon_regmap_lookup_by_phandle(np, "mediatek,sysctl");  in mt7621_wdt_probe()
152 	if (IS_ERR(drvdata->sysc)) {  in mt7621_wdt_probe()
153 		drvdata->sysc = syscon_regmap_lookup_by_compatible("mediatek,mt7621-sysc");  in mt7621_wdt_probe()
154 		if (IS_ERR(drvdata->sysc))  in mt7621_wdt_probe()
155 			return PTR_ERR(drvdata->sysc);  in mt7621_wdt_probe()
158 	drvdata->base = devm_platform_ioremap_resource(pdev, 0);  in mt7621_wdt_probe()
159 	if (IS_ERR(drvdata->base))  in mt7621_wdt_probe()
160 		return PTR_ERR(drvdata->base);  in mt7621_wdt_probe()
162 	drvdata->rst = devm_reset_control_get_exclusive(dev, NULL);  in mt7621_wdt_probe()
163 	if (!IS_ERR(drvdata->rst))  in mt7621_wdt_probe()
164 		reset_control_deassert(drvdata->rst);  in mt7621_wdt_probe()
166 	mt7621_wdt = &drvdata->wdt;  in mt7621_wdt_probe()
167 	mt7621_wdt->info = &mt7621_wdt_info;  in mt7621_wdt_probe()
168 	mt7621_wdt->ops = &mt7621_wdt_ops;  in mt7621_wdt_probe()
169 	mt7621_wdt->min_timeout = 1;  in mt7621_wdt_probe()
170 	mt7621_wdt->max_timeout = 0xfffful / 1000;  in mt7621_wdt_probe()
171 	mt7621_wdt->parent = dev;  in mt7621_wdt_probe()
173 	mt7621_wdt->bootstatus = mt7621_wdt_bootcause(drvdata);  in mt7621_wdt_probe()
175 	watchdog_init_timeout(mt7621_wdt, mt7621_wdt->max_timeout, dev);  in mt7621_wdt_probe()
187 		 * and timeout, and then re-enable the watchdog.  in mt7621_wdt_probe()
191 		set_bit(WDOG_HW_RUNNING, &mt7621_wdt->status);  in mt7621_wdt_probe()
194 	err = devm_watchdog_register_device(dev, &drvdata->wdt);  in mt7621_wdt_probe()
207 	mt7621_wdt_stop(&drvdata->wdt);  in mt7621_wdt_shutdown()
211 	{ .compatible = "mediatek,mt7621-wdt" },