1 // SPDX-License-Identifier: GPL-2.0
76 		return -ETIMEDOUT;  in imx7ulp_wdt_wait_ulk()
81 static int imx7ulp_wdt_wait_rcs(struct imx7ulp_wdt_device *wdt)  in imx7ulp_wdt_wait_rcs()  argument
84 	u32 val = readl(wdt->base + WDOG_CS);  in imx7ulp_wdt_wait_rcs()
91 	    readl_poll_timeout(wdt->base + WDOG_CS, val, val & WDOG_CS_RCS, 100,  in imx7ulp_wdt_wait_rcs()
93 		ret = -ETIMEDOUT;  in imx7ulp_wdt_wait_rcs()
96 	if (wdt->post_rcs_wait)  in imx7ulp_wdt_wait_rcs()
102 static int _imx7ulp_wdt_enable(struct imx7ulp_wdt_device *wdt, bool enable)  in _imx7ulp_wdt_enable()  argument
104 	u32 val = readl(wdt->base + WDOG_CS);  in _imx7ulp_wdt_enable()
108 	writel(UNLOCK, wdt->base + WDOG_CNT);  in _imx7ulp_wdt_enable()
109 	ret = imx7ulp_wdt_wait_ulk(wdt->base);  in _imx7ulp_wdt_enable()
113 		writel(val | WDOG_CS_EN, wdt->base + WDOG_CS);  in _imx7ulp_wdt_enable()
115 		writel(val & ~WDOG_CS_EN, wdt->base + WDOG_CS);  in _imx7ulp_wdt_enable()
118 	ret = imx7ulp_wdt_wait_rcs(wdt);  in _imx7ulp_wdt_enable()
129 	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);  in imx7ulp_wdt_enable()  local
135 		ret = _imx7ulp_wdt_enable(wdt, enable);  in imx7ulp_wdt_enable()
136 		val = readl(wdt->base + WDOG_CS);  in imx7ulp_wdt_enable()
137 	} while (--loop > 0 && ((!!(val & WDOG_CS_EN)) != enable || ret));  in imx7ulp_wdt_enable()
140 		return -EBUSY;  in imx7ulp_wdt_enable()
147 	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);  in imx7ulp_wdt_ping()  local
149 	writel(REFRESH, wdt->base + WDOG_CNT);  in imx7ulp_wdt_ping()
164 static int _imx7ulp_wdt_set_timeout(struct imx7ulp_wdt_device *wdt,  in _imx7ulp_wdt_set_timeout()  argument
170 	writel(UNLOCK, wdt->base + WDOG_CNT);  in _imx7ulp_wdt_set_timeout()
171 	ret = imx7ulp_wdt_wait_ulk(wdt->base);  in _imx7ulp_wdt_set_timeout()
174 	writel(toval, wdt->base + WDOG_TOVAL);  in _imx7ulp_wdt_set_timeout()
176 	ret = imx7ulp_wdt_wait_rcs(wdt);  in _imx7ulp_wdt_set_timeout()
187 	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);  in imx7ulp_wdt_set_timeout()  local
188 	u32 toval = wdt->hw->wdog_clock_rate * timeout;  in imx7ulp_wdt_set_timeout()
194 		ret = _imx7ulp_wdt_set_timeout(wdt, toval);  in imx7ulp_wdt_set_timeout()
195 		val = readl(wdt->base + WDOG_TOVAL);  in imx7ulp_wdt_set_timeout()
196 	} while (--loop > 0 && (val != toval || ret));  in imx7ulp_wdt_set_timeout()
199 		return -EBUSY;  in imx7ulp_wdt_set_timeout()
201 	wdog->timeout = timeout;  in imx7ulp_wdt_set_timeout()
208 	struct imx7ulp_wdt_device *wdt = watchdog_get_drvdata(wdog);  in imx7ulp_wdt_restart()  local
215 	ret = imx7ulp_wdt_set_timeout(&wdt->wdd, 1);  in imx7ulp_wdt_restart()
241 static int _imx7ulp_wdt_init(struct imx7ulp_wdt_device *wdt, unsigned int timeout, unsigned int cs)  in _imx7ulp_wdt_init()  argument
248 	val = readl(wdt->base + WDOG_CS);  in _imx7ulp_wdt_init()
250 		writel(UNLOCK, wdt->base + WDOG_CNT);  in _imx7ulp_wdt_init()
254 		writel_relaxed(UNLOCK_SEQ0, wdt->base + WDOG_CNT);  in _imx7ulp_wdt_init()
255 		writel_relaxed(UNLOCK_SEQ1, wdt->base + WDOG_CNT);  in _imx7ulp_wdt_init()
259 	ret = imx7ulp_wdt_wait_ulk(wdt->base);  in _imx7ulp_wdt_init()
264 	writel(timeout, wdt->base + WDOG_TOVAL);  in _imx7ulp_wdt_init()
265 	writel(cs, wdt->base + WDOG_CS);  in _imx7ulp_wdt_init()
267 	ret = imx7ulp_wdt_wait_rcs(wdt);  in _imx7ulp_wdt_init()
276 static int imx7ulp_wdt_init(struct imx7ulp_wdt_device *wdt, unsigned int timeout)  in imx7ulp_wdt_init()  argument
285 	if (wdt->hw->prescaler_enable)  in imx7ulp_wdt_init()
289 		ret = _imx7ulp_wdt_init(wdt, timeout, val);  in imx7ulp_wdt_init()
290 		toval = readl(wdt->base + WDOG_TOVAL);  in imx7ulp_wdt_init()
291 		cs = readl(wdt->base + WDOG_CS);  in imx7ulp_wdt_init()
293 	} while (--loop > 0 && (cs != val || toval != timeout || ret));  in imx7ulp_wdt_init()
296 		return -EBUSY;  in imx7ulp_wdt_init()
304 	struct device *dev = &pdev->dev;  in imx7ulp_wdt_probe()
310 		return -ENOMEM;  in imx7ulp_wdt_probe()
314 	imx7ulp_wdt->base = devm_platform_ioremap_resource(pdev, 0);  in imx7ulp_wdt_probe()
315 	if (IS_ERR(imx7ulp_wdt->base))  in imx7ulp_wdt_probe()
316 		return PTR_ERR(imx7ulp_wdt->base);  in imx7ulp_wdt_probe()
318 	imx7ulp_wdt->clk = devm_clk_get_enabled(dev, NULL);  in imx7ulp_wdt_probe()
319 	if (IS_ERR(imx7ulp_wdt->clk)) {  in imx7ulp_wdt_probe()
321 		return PTR_ERR(imx7ulp_wdt->clk);  in imx7ulp_wdt_probe()
324 	imx7ulp_wdt->post_rcs_wait = true;  in imx7ulp_wdt_probe()
325 	if (of_device_is_compatible(dev->of_node,  in imx7ulp_wdt_probe()
326 				    "fsl,imx8ulp-wdt")) {  in imx7ulp_wdt_probe()
327 		dev_info(dev, "imx8ulp wdt probe\n");  in imx7ulp_wdt_probe()
328 		imx7ulp_wdt->post_rcs_wait = false;  in imx7ulp_wdt_probe()
330 		dev_info(dev, "imx7ulp wdt probe\n");  in imx7ulp_wdt_probe()
333 	wdog = &imx7ulp_wdt->wdd;  in imx7ulp_wdt_probe()
334 	wdog->info = &imx7ulp_wdt_info;  in imx7ulp_wdt_probe()
335 	wdog->ops = &imx7ulp_wdt_ops;  in imx7ulp_wdt_probe()
336 	wdog->min_timeout = 1;  in imx7ulp_wdt_probe()
337 	wdog->max_timeout = MAX_TIMEOUT;  in imx7ulp_wdt_probe()
338 	wdog->parent = dev;  in imx7ulp_wdt_probe()
339 	wdog->timeout = DEFAULT_TIMEOUT;  in imx7ulp_wdt_probe()
346 	imx7ulp_wdt->hw = of_device_get_match_data(dev);  in imx7ulp_wdt_probe()
347 	ret = imx7ulp_wdt_init(imx7ulp_wdt, wdog->timeout * imx7ulp_wdt->hw->wdog_clock_rate);  in imx7ulp_wdt_probe()
358 	if (watchdog_active(&imx7ulp_wdt->wdd))  in imx7ulp_wdt_suspend_noirq()
359 		imx7ulp_wdt_stop(&imx7ulp_wdt->wdd);  in imx7ulp_wdt_suspend_noirq()
361 	clk_disable_unprepare(imx7ulp_wdt->clk);  in imx7ulp_wdt_suspend_noirq()
369 	u32 timeout = imx7ulp_wdt->wdd.timeout * imx7ulp_wdt->hw->wdog_clock_rate;  in imx7ulp_wdt_resume_noirq()
372 	ret = clk_prepare_enable(imx7ulp_wdt->clk);  in imx7ulp_wdt_resume_noirq()
376 	if (watchdog_active(&imx7ulp_wdt->wdd)) {  in imx7ulp_wdt_resume_noirq()
378 		imx7ulp_wdt_start(&imx7ulp_wdt->wdd);  in imx7ulp_wdt_resume_noirq()
379 		imx7ulp_wdt_ping(&imx7ulp_wdt->wdd);  in imx7ulp_wdt_resume_noirq()
401 	{ .compatible = "fsl,imx8ulp-wdt", .data = &imx7ulp_wdt_hw, },
402 	{ .compatible = "fsl,imx7ulp-wdt", .data = &imx7ulp_wdt_hw, },
403 	{ .compatible = "fsl,imx93-wdt", .data = &imx93_wdt_hw, },
411 		.name	= "imx7ulp-wdt",