1 // SPDX-License-Identifier: GPL-2.0-only
54 static void __iomem *wdt_addr(struct qcom_wdt *wdt, enum wdt_reg reg)  in wdt_addr()  argument
56 	return wdt->base + wdt->layout[reg];  in wdt_addr()
76 	struct qcom_wdt *wdt = to_qcom_wdt(wdd);  in qcom_wdt_start()  local
77 	unsigned int bark = wdd->timeout - wdd->pretimeout;  in qcom_wdt_start()
79 	writel(0, wdt_addr(wdt, WDT_EN));  in qcom_wdt_start()
80 	writel(1, wdt_addr(wdt, WDT_RST));  in qcom_wdt_start()
81 	writel(bark * wdt->rate, wdt_addr(wdt, WDT_BARK_TIME));  in qcom_wdt_start()
82 	writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BITE_TIME));  in qcom_wdt_start()
83 	writel(QCOM_WDT_ENABLE, wdt_addr(wdt, WDT_EN));  in qcom_wdt_start()
89 	struct qcom_wdt *wdt = to_qcom_wdt(wdd);  in qcom_wdt_stop()  local
91 	writel(0, wdt_addr(wdt, WDT_EN));  in qcom_wdt_stop()
97 	struct qcom_wdt *wdt = to_qcom_wdt(wdd);  in qcom_wdt_ping()  local
99 	writel(1, wdt_addr(wdt, WDT_RST));  in qcom_wdt_ping()
106 	wdd->timeout = timeout;  in qcom_wdt_set_timeout()
113 	wdd->pretimeout = timeout;  in qcom_wdt_set_pretimeout()
120 	struct qcom_wdt *wdt = to_qcom_wdt(wdd);  in qcom_wdt_restart()  local
125 	 *    Setup BITE_TIME to be 128ms, and enable WDT.  in qcom_wdt_restart()
127 	timeout = 128 * wdt->rate / 1000;  in qcom_wdt_restart()
129 	writel(0, wdt_addr(wdt, WDT_EN));  in qcom_wdt_restart()
130 	writel(1, wdt_addr(wdt, WDT_RST));  in qcom_wdt_restart()
131 	writel(timeout, wdt_addr(wdt, WDT_BARK_TIME));  in qcom_wdt_restart()
132 	writel(timeout, wdt_addr(wdt, WDT_BITE_TIME));  in qcom_wdt_restart()
133 	writel(QCOM_WDT_ENABLE, wdt_addr(wdt, WDT_EN));  in qcom_wdt_restart()
146 	struct qcom_wdt *wdt = to_qcom_wdt(wdd);  in qcom_wdt_is_running()  local
148 	return (readl(wdt_addr(wdt, WDT_EN)) & QCOM_WDT_ENABLE);  in qcom_wdt_is_running()
198 	struct device *dev = &pdev->dev;  in qcom_wdt_probe()
199 	struct qcom_wdt *wdt;  in qcom_wdt_probe()  local
201 	struct device_node *np = dev->of_node;  in qcom_wdt_probe()
209 		dev_err(dev, "Unsupported QCOM WDT module\n");  in qcom_wdt_probe()
210 		return -ENODEV;  in qcom_wdt_probe()
213 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);  in qcom_wdt_probe()
214 	if (!wdt)  in qcom_wdt_probe()
215 		return -ENOMEM;  in qcom_wdt_probe()
219 		return -ENOMEM;  in qcom_wdt_probe()
222 	if (of_property_read_u32(np, "cpu-offset", &percpu_offset))  in qcom_wdt_probe()
225 	res->start += percpu_offset;  in qcom_wdt_probe()
226 	res->end += percpu_offset;  in qcom_wdt_probe()
228 	wdt->base = devm_ioremap_resource(dev, res);  in qcom_wdt_probe()
229 	if (IS_ERR(wdt->base))  in qcom_wdt_probe()
230 		return PTR_ERR(wdt->base);  in qcom_wdt_probe()
240 	 * not zero to avoid a divide-by-zero exception.  in qcom_wdt_probe()
242 	 * WATCHDOG_CORE assumes units of seconds, if the WDT is clocked such  in qcom_wdt_probe()
246 	wdt->rate = clk_get_rate(clk);  in qcom_wdt_probe()
247 	if (wdt->rate == 0 ||  in qcom_wdt_probe()
248 	    wdt->rate > data->max_tick_count) {  in qcom_wdt_probe()
250 		return -EINVAL;  in qcom_wdt_probe()
255 	if (data->pretimeout && irq > 0) {  in qcom_wdt_probe()
257 				       "wdt_bark", &wdt->wdd);  in qcom_wdt_probe()
261 		wdt->wdd.info = &qcom_wdt_pt_info;  in qcom_wdt_probe()
262 		wdt->wdd.pretimeout = 1;  in qcom_wdt_probe()
264 		if (irq == -EPROBE_DEFER)  in qcom_wdt_probe()
265 			return -EPROBE_DEFER;  in qcom_wdt_probe()
267 		wdt->wdd.info = &qcom_wdt_info;  in qcom_wdt_probe()
270 	wdt->wdd.ops = &qcom_wdt_ops;  in qcom_wdt_probe()
271 	wdt->wdd.min_timeout = 1;  in qcom_wdt_probe()
272 	wdt->wdd.max_timeout = data->max_tick_count / wdt->rate;  in qcom_wdt_probe()
273 	wdt->wdd.parent = dev;  in qcom_wdt_probe()
274 	wdt->layout = data->offset;  in qcom_wdt_probe()
276 	if (readl(wdt_addr(wdt, WDT_STS)) & 1)  in qcom_wdt_probe()
277 		wdt->wdd.bootstatus = WDIOF_CARDRESET;  in qcom_wdt_probe()
280 	 * If 'timeout-sec' unspecified in devicetree, assume a 30 second  in qcom_wdt_probe()
284 	wdt->wdd.timeout = min(wdt->wdd.max_timeout, 30U);  in qcom_wdt_probe()
285 	watchdog_init_timeout(&wdt->wdd, 0, dev);  in qcom_wdt_probe()
288 	 * If WDT is already running, call WDT start which  in qcom_wdt_probe()
289 	 * will stop the WDT, set timeouts as bootloader  in qcom_wdt_probe()
291 	 * to inform the WDT subsystem to ping the WDT  in qcom_wdt_probe()
293 	if (qcom_wdt_is_running(&wdt->wdd)) {  in qcom_wdt_probe()
294 		qcom_wdt_start(&wdt->wdd);  in qcom_wdt_probe()
295 		set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);  in qcom_wdt_probe()
298 	ret = devm_watchdog_register_device(dev, &wdt->wdd);  in qcom_wdt_probe()
302 	platform_set_drvdata(pdev, wdt);  in qcom_wdt_probe()
308 	struct qcom_wdt *wdt = dev_get_drvdata(dev);  in qcom_wdt_suspend()  local
310 	if (watchdog_active(&wdt->wdd))  in qcom_wdt_suspend()
311 		qcom_wdt_stop(&wdt->wdd);  in qcom_wdt_suspend()
318 	struct qcom_wdt *wdt = dev_get_drvdata(dev);  in qcom_wdt_resume()  local
320 	if (watchdog_active(&wdt->wdd))  in qcom_wdt_resume()
321 		qcom_wdt_start(&wdt->wdd);  in qcom_wdt_resume()
331 	{ .compatible = "qcom,apss-wdt-ipq5424", .data = &match_data_ipq5424 },
332 	{ .compatible = "qcom,kpss-timer", .data = &match_data_apcs_tmr },
333 	{ .compatible = "qcom,scss-timer", .data = &match_data_apcs_tmr },
334 	{ .compatible = "qcom,kpss-wdt", .data = &match_data_kpss },
349 MODULE_DESCRIPTION("QCOM KPSS Watchdog Driver");