drivers/watchdog/cadence_wdt.c

85 static inline void cdns_wdt_writereg(struct cdns_wdt *wdt, u32 offset, u32 val)
87 	writel_relaxed(val, wdt->regs + offset);
126 	struct cdns_wdt *wdt = watchdog_get_drvdata(wdd);
128 	spin_lock(&wdt->io_lock);
129 	cdns_wdt_writereg(wdt, CDNS_WDT_ZMR_OFFSET,
131 	spin_unlock(&wdt->io_lock);
147 	struct cdns_wdt *wdt = watchdog_get_drvdata(wdd);
149 	spin_lock(&wdt->io_lock);
150 	cdns_wdt_writereg(wdt, CDNS_WDT_RESTART_OFFSET,
152 	spin_unlock(&wdt->io_lock);
177 	struct cdns_wdt *wdt = watchdog_get_drvdata(wdd);
180 	unsigned long clock_f = clk_get_rate(wdt->clk);
186 	count = (wdd->timeout * (clock_f / wdt->prescaler)) /
192 	spin_lock(&wdt->io_lock);
193 	cdns_wdt_writereg(wdt, CDNS_WDT_ZMR_OFFSET,
199 	data = count | CDNS_WDT_REGISTER_ACCESS_KEY | wdt->ctrl_clksel;
200 	cdns_wdt_writereg(wdt, CDNS_WDT_CCR_OFFSET, data);
205 	if (wdt->rst) {
212 	cdns_wdt_writereg(wdt, CDNS_WDT_ZMR_OFFSET, data);
213 	cdns_wdt_writereg(wdt, CDNS_WDT_RESTART_OFFSET,
215 	spin_unlock(&wdt->io_lock);
291 	struct cdns_wdt *wdt;
294 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
295 	if (!wdt)
298 	cdns_wdt_device = &wdt->cdns_wdt_device;
305 	wdt->regs = devm_platform_ioremap_resource(pdev, 0);
306 	if (IS_ERR(wdt->regs))
307 		return PTR_ERR(wdt->regs);
310 	wdt->rst = of_property_read_bool(dev->of_node, "reset-on-timeout");
312 	if (!wdt->rst && irq >= 0) {
329 	watchdog_set_drvdata(cdns_wdt_device, wdt);
331 	wdt->clk = devm_clk_get_enabled(dev, NULL);
332 	if (IS_ERR(wdt->clk))
333 		return dev_err_probe(dev, PTR_ERR(wdt->clk),
336 	clock_f = clk_get_rate(wdt->clk);
338 		wdt->prescaler = CDNS_WDT_PRESCALE_512;
339 		wdt->ctrl_clksel = CDNS_WDT_PRESCALE_SELECT_512;
341 		wdt->prescaler = CDNS_WDT_PRESCALE_4096;
342 		wdt->ctrl_clksel = CDNS_WDT_PRESCALE_SELECT_4096;
345 	spin_lock_init(&wdt->io_lock);
352 	platform_set_drvdata(pdev, wdt);
368 	struct cdns_wdt *wdt = dev_get_drvdata(dev);
370 	if (watchdog_active(&wdt->cdns_wdt_device)) {
371 		cdns_wdt_stop(&wdt->cdns_wdt_device);
372 		clk_disable_unprepare(wdt->clk);
387 	struct cdns_wdt *wdt = dev_get_drvdata(dev);
389 	if (watchdog_active(&wdt->cdns_wdt_device)) {
390 		ret = clk_prepare_enable(wdt->clk);
395 		cdns_wdt_start(&wdt->cdns_wdt_device);
404 	{ .compatible = "cdns,wdt-r1p2", },
413 		.name	= "cdns-wdt",