1 // SPDX-License-Identifier: GPL-2.0
5  * (c) Copyright 2019-2020 Texas Instruments Inc.
66  * @base - base io address of WD device
67  * @freq - source clock frequency of WDT
68  * @wdd  - hold watchdog device as is in WDT core
72 	unsigned long		freq;  member
82 	ret = pm_runtime_resume_and_get(wdd->parent);  in rti_wdt_start()
87 	timer_margin = (u64)wdd->timeout * wdt->freq;  in rti_wdt_start()
91 	writel_relaxed(timer_margin, wdt->base + RTIDWDPRLD);  in rti_wdt_start()
100 	wdd->min_hw_heartbeat_ms = 500 * wdd->timeout;  in rti_wdt_start()
103 	writel_relaxed(RTIWWDRX_NMI, wdt->base + RTIWWDRXCTRL);  in rti_wdt_start()
106 	writel_relaxed(RTIWWDSIZE_50P, wdt->base + RTIWWDSIZECTRL);  in rti_wdt_start()
108 	readl_relaxed(wdt->base + RTIWWDSIZECTRL);  in rti_wdt_start()
111 	writel_relaxed(WDENABLE_KEY, wdt->base + RTIDWDCTRL);  in rti_wdt_start()
120 	writel_relaxed(WDKEY_SEQ0, wdt->base + RTIWDKEY);  in rti_wdt_ping()
122 	writel_relaxed(WDKEY_SEQ1, wdt->base + RTIWDKEY);  in rti_wdt_ping()
137 		/* 50% open window => 50% min heartbeat */  in rti_wdt_setup_hw_hb()
138 		wdd->min_hw_heartbeat_ms = 500 * heartbeat;  in rti_wdt_setup_hw_hb()
142 		/* 25% open window => 75% min heartbeat */  in rti_wdt_setup_hw_hb()
143 		wdd->min_hw_heartbeat_ms = 750 * heartbeat;  in rti_wdt_setup_hw_hb()
147 		/* 12.5% open window => 87.5% min heartbeat */  in rti_wdt_setup_hw_hb()
148 		wdd->min_hw_heartbeat_ms = 875 * heartbeat;  in rti_wdt_setup_hw_hb()
152 		/* 6.5% open window => 93.5% min heartbeat */  in rti_wdt_setup_hw_hb()
153 		wdd->min_hw_heartbeat_ms = 935 * heartbeat;  in rti_wdt_setup_hw_hb()
157 		/* 3.125% open window => 96.9% min heartbeat */  in rti_wdt_setup_hw_hb()
158 		wdd->min_hw_heartbeat_ms = 969 * heartbeat;  in rti_wdt_setup_hw_hb()
162 		return -EINVAL;  in rti_wdt_setup_hw_hb()
175 	val = readl_relaxed(wdt->base + RTIWDSTATUS);  in rti_wdt_get_timeleft_ms()
179 	timer_counter = readl_relaxed(wdt->base + RTIDWDCNTR);  in rti_wdt_get_timeleft_ms()
183 	do_div(timer_counter, wdt->freq);  in rti_wdt_get_timeleft_ms()
208 	struct device *dev = &pdev->dev;  in rti_wdt_probe()
221 		return -ENOMEM;  in rti_wdt_probe()
227 	wdt->freq = clk_get_rate(clk);  in rti_wdt_probe()
231 	if (!wdt->freq) {  in rti_wdt_probe()
233 		return -EINVAL;  in rti_wdt_probe()
241 	if (wdt->freq < 32768)  in rti_wdt_probe()
242 		wdt->freq = wdt->freq * 9 / 10;  in rti_wdt_probe()
247 		pm_runtime_disable(&pdev->dev);  in rti_wdt_probe()
253 	wdd = &wdt->wdd;  in rti_wdt_probe()
254 	wdd->info = &rti_wdt_info;  in rti_wdt_probe()
255 	wdd->ops = &rti_wdt_ops;  in rti_wdt_probe()
256 	wdd->min_timeout = 1;  in rti_wdt_probe()
257 	wdd->max_hw_heartbeat_ms = (WDT_PRELOAD_MAX << WDT_PRELOAD_SHIFT) /  in rti_wdt_probe()
258 		wdt->freq * 1000;  in rti_wdt_probe()
259 	wdd->parent = dev;  in rti_wdt_probe()
265 	wdt->base = devm_platform_ioremap_resource(pdev, 0);  in rti_wdt_probe()
266 	if (IS_ERR(wdt->base)) {  in rti_wdt_probe()
267 		ret = PTR_ERR(wdt->base);  in rti_wdt_probe()
271 	if (readl(wdt->base + RTIDWDCTRL) == WDENABLE_KEY) {  in rti_wdt_probe()
277 		set_bit(WDOG_HW_RUNNING, &wdd->status);  in rti_wdt_probe()
279 		heartbeat_ms = readl(wdt->base + RTIDWDPRLD);  in rti_wdt_probe()
282 		do_div(heartbeat_ms, wdt->freq);  in rti_wdt_probe()
290 		wsize = readl(wdt->base + RTIWWDSIZECTRL);  in rti_wdt_probe()
297 		last_ping = heartbeat_ms - time_left_ms;  in rti_wdt_probe()
304 	node = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);  in rti_wdt_probe()
314 		 * Readout the Power-on(PON) reason and pass to bootstatus.  in rti_wdt_probe()
320 			ret = -EINVAL;  in rti_wdt_probe()
326 			dev_err(dev, "Failed to map memory-region.\n");  in rti_wdt_probe()
327 			ret = -ENOMEM;  in rti_wdt_probe()
334 			wdd->bootstatus |= WDIOF_CARDRESET;  in rti_wdt_probe()
352 		pm_runtime_put_sync(&pdev->dev);  in rti_wdt_probe()
357 	pm_runtime_put_sync(&pdev->dev);  in rti_wdt_probe()
358 	pm_runtime_disable(&pdev->dev);  in rti_wdt_probe()
367 	watchdog_unregister_device(&wdt->wdd);  in rti_wdt_remove()
369 	if (!pm_runtime_suspended(&pdev->dev))  in rti_wdt_remove()
370 		pm_runtime_put(&pdev->dev);  in rti_wdt_remove()
372 	pm_runtime_disable(&pdev->dev);  in rti_wdt_remove()
376 	{ .compatible = "ti,j7-rti-wdt", },
383 		.name = "rti-wdt",
392 MODULE_AUTHOR("Tero Kristo <t-kristo@ti.com>");
402 MODULE_ALIAS("platform:rti-wdt");