1 // SPDX-License-Identifier: GPL-2.0-only OR MIT
22  * This HW block has three separate watchdogs. WD0 resets the machine
71 	writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CUR_TIME);  in apple_wdt_start()
72 	writel_relaxed(APPLE_WDT_CTRL_RESET_EN, wdt->regs + APPLE_WDT_WD1_CTRL);  in apple_wdt_start()
81 	writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CTRL);  in apple_wdt_stop()
90 	writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CUR_TIME);  in apple_wdt_ping()
100 	writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CUR_TIME);  in apple_wdt_set_timeout()
102 	actual = min(s, wdd->max_hw_heartbeat_ms / 1000);  in apple_wdt_set_timeout()
103 	writel_relaxed(wdt->clk_rate * actual, wdt->regs + APPLE_WDT_WD1_BITE_TIME);  in apple_wdt_set_timeout()
105 	wdd->timeout = s;  in apple_wdt_set_timeout()
115 	cur_time = readl_relaxed(wdt->regs + APPLE_WDT_WD1_CUR_TIME);  in apple_wdt_get_timeleft()
116 	reset_time = readl_relaxed(wdt->regs + APPLE_WDT_WD1_BITE_TIME);  in apple_wdt_get_timeleft()
118 	return (reset_time - cur_time) / wdt->clk_rate;  in apple_wdt_get_timeleft()
126 	writel_relaxed(APPLE_WDT_CTRL_RESET_EN, wdt->regs + APPLE_WDT_WD1_CTRL);  in apple_wdt_restart()
127 	writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_BITE_TIME);  in apple_wdt_restart()
128 	writel_relaxed(0, wdt->regs + APPLE_WDT_WD1_CUR_TIME);  in apple_wdt_restart()
133 	 * can take up to ~120-125ms until the SoC is actually reset. Just  in apple_wdt_restart()
134 	 * wait 150ms here to be safe.  in apple_wdt_restart()
136 	(void)readl(wdt->regs + APPLE_WDT_WD1_CUR_TIME);  in apple_wdt_restart()
159 	struct device *dev = &pdev->dev;  in apple_wdt_probe()
166 		return -ENOMEM;  in apple_wdt_probe()
168 	wdt->regs = devm_platform_ioremap_resource(pdev, 0);  in apple_wdt_probe()
169 	if (IS_ERR(wdt->regs))  in apple_wdt_probe()
170 		return PTR_ERR(wdt->regs);  in apple_wdt_probe()
175 	wdt->clk_rate = clk_get_rate(clk);  in apple_wdt_probe()
176 	if (!wdt->clk_rate)  in apple_wdt_probe()
177 		return -EINVAL;  in apple_wdt_probe()
181 	wdt->wdd.ops = &apple_wdt_ops;  in apple_wdt_probe()
182 	wdt->wdd.info = &apple_wdt_info;  in apple_wdt_probe()
183 	wdt->wdd.max_hw_heartbeat_ms = U32_MAX / wdt->clk_rate * 1000;  in apple_wdt_probe()
184 	wdt->wdd.timeout = APPLE_WDT_TIMEOUT_DEFAULT;  in apple_wdt_probe()
186 	wdt_ctrl = readl_relaxed(wdt->regs + APPLE_WDT_WD1_CTRL);  in apple_wdt_probe()
188 		set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);  in apple_wdt_probe()
190 	watchdog_init_timeout(&wdt->wdd, 0, dev);  in apple_wdt_probe()
191 	apple_wdt_set_timeout(&wdt->wdd, wdt->wdd.timeout);  in apple_wdt_probe()
192 	watchdog_stop_on_unregister(&wdt->wdd);  in apple_wdt_probe()
193 	watchdog_set_restart_priority(&wdt->wdd, 128);  in apple_wdt_probe()
195 	return devm_watchdog_register_device(dev, &wdt->wdd);  in apple_wdt_probe()
202 	if (watchdog_active(&wdt->wdd) || watchdog_hw_running(&wdt->wdd))  in apple_wdt_resume()
203 		apple_wdt_start(&wdt->wdd);  in apple_wdt_resume()
212 	if (watchdog_active(&wdt->wdd) || watchdog_hw_running(&wdt->wdd))  in apple_wdt_suspend()
213 		apple_wdt_stop(&wdt->wdd);  in apple_wdt_suspend()
228 		.name = "apple-watchdog",