1 // SPDX-License-Identifier: GPL-2.0
5  * (c) Copyright 2019-2020 Texas Instruments Inc.
25 #define MAX_HEARTBEAT	1000
59  * @base - base io address of WD device
60  * @freq - source clock frequency of WDT
61  * @wdd  - hold watchdog device as is in WDT core
64 	void __iomem		*base;  member
75 	timer_margin = (u64)wdd->timeout * wdt->freq;  in rti_wdt_start()
79 	writel_relaxed(timer_margin, wdt->base + RTIDWDPRLD);  in rti_wdt_start()
88 	wdd->min_hw_heartbeat_ms = 500 * wdd->timeout;  in rti_wdt_start()
91 	writel_relaxed(RTIWWDRX_NMI, wdt->base + RTIWWDRXCTRL);  in rti_wdt_start()
94 	writel_relaxed(RTIWWDSIZE_50P, wdt->base + RTIWWDSIZECTRL);  in rti_wdt_start()
96 	readl_relaxed(wdt->base + RTIWWDSIZECTRL);  in rti_wdt_start()
99 	writel_relaxed(WDENABLE_KEY, wdt->base + RTIDWDCTRL);  in rti_wdt_start()
108 	writel_relaxed(WDKEY_SEQ0, wdt->base + RTIWDKEY);  in rti_wdt_ping()
110 	writel_relaxed(WDKEY_SEQ1, wdt->base + RTIWDKEY);  in rti_wdt_ping()
126 		wdd->min_hw_heartbeat_ms = 500 * heartbeat;  in rti_wdt_setup_hw_hb()
131 		wdd->min_hw_heartbeat_ms = 750 * heartbeat;  in rti_wdt_setup_hw_hb()
136 		wdd->min_hw_heartbeat_ms = 875 * heartbeat;  in rti_wdt_setup_hw_hb()
141 		wdd->min_hw_heartbeat_ms = 935 * heartbeat;  in rti_wdt_setup_hw_hb()
146 		wdd->min_hw_heartbeat_ms = 969 * heartbeat;  in rti_wdt_setup_hw_hb()
150 		return -EINVAL;  in rti_wdt_setup_hw_hb()
163 	val = readl_relaxed(wdt->base + RTIWDSTATUS);  in rti_wdt_get_timeleft_ms()
167 	timer_counter = readl_relaxed(wdt->base + RTIDWDCNTR);  in rti_wdt_get_timeleft_ms()
169 	timer_counter *= 1000;  in rti_wdt_get_timeleft_ms()
171 	do_div(timer_counter, wdt->freq);  in rti_wdt_get_timeleft_ms()
178 	return rti_wdt_get_timeleft_ms(wdd) / 1000;  in rti_wdt_get_timeleft()
196 	struct device *dev = &pdev->dev;  in rti_wdt_probe()
205 		return -ENOMEM;  in rti_wdt_probe()
211 	wdt->freq = clk_get_rate(clk);  in rti_wdt_probe()
215 	if (!wdt->freq) {  in rti_wdt_probe()
217 		return -EINVAL;  in rti_wdt_probe()
222 	 * Adjust frequency down in this case so that we don't pet  in rti_wdt_probe()
225 	if (wdt->freq < 32768)  in rti_wdt_probe()
226 		wdt->freq = wdt->freq * 9 / 10;  in rti_wdt_probe()
232 		pm_runtime_disable(&pdev->dev);  in rti_wdt_probe()
238 	wdd = &wdt->wdd;  in rti_wdt_probe()
239 	wdd->info = &rti_wdt_info;  in rti_wdt_probe()
240 	wdd->ops = &rti_wdt_ops;  in rti_wdt_probe()
241 	wdd->min_timeout = 1;  in rti_wdt_probe()
242 	wdd->max_hw_heartbeat_ms = (WDT_PRELOAD_MAX << WDT_PRELOAD_SHIFT) /  in rti_wdt_probe()
243 		wdt->freq * 1000;  in rti_wdt_probe()
244 	wdd->parent = dev;  in rti_wdt_probe()
251 	wdt->base = devm_ioremap_resource(dev, wdt_mem);  in rti_wdt_probe()
252 	if (IS_ERR(wdt->base)) {  in rti_wdt_probe()
253 		ret = PTR_ERR(wdt->base);  in rti_wdt_probe()
257 	if (readl(wdt->base + RTIDWDCTRL) == WDENABLE_KEY) {  in rti_wdt_probe()
262 		set_bit(WDOG_HW_RUNNING, &wdd->status);  in rti_wdt_probe()
264 		heartbeat_ms = readl(wdt->base + RTIDWDPRLD);  in rti_wdt_probe()
266 		heartbeat_ms *= 1000;  in rti_wdt_probe()
267 		do_div(heartbeat_ms, wdt->freq);  in rti_wdt_probe()
268 		if (heartbeat_ms != heartbeat * 1000)  in rti_wdt_probe()
272 		heartbeat /= 1000;  in rti_wdt_probe()
274 		wsize = readl(wdt->base + RTIWWDSIZECTRL);  in rti_wdt_probe()
281 		last_ping = heartbeat_ms - time_left_ms;  in rti_wdt_probe()
302 	pm_runtime_put_sync(&pdev->dev);  in rti_wdt_probe()
303 	pm_runtime_disable(&pdev->dev);  in rti_wdt_probe()
312 	watchdog_unregister_device(&wdt->wdd);  in rti_wdt_remove()
313 	pm_runtime_put(&pdev->dev);  in rti_wdt_remove()
314 	pm_runtime_disable(&pdev->dev);  in rti_wdt_remove()
320 	{ .compatible = "ti,j7-rti-wdt", },
327 		.name = "rti-wdt",
336 MODULE_AUTHOR("Tero Kristo <t-kristo@ti.com>");
346 MODULE_ALIAS("platform:rti-wdt");