83 struct dw_wdt {  struct
101 #define to_dw_wdt(wdd)	container_of(wdd, struct dw_wdt, wdd)  argument
103 static inline int dw_wdt_is_enabled(struct dw_wdt *dw_wdt)  in dw_wdt_is_enabled()  argument
105 	return readl(dw_wdt->regs + WDOG_CONTROL_REG_OFFSET) &  in dw_wdt_is_enabled()
109 static void dw_wdt_update_mode(struct dw_wdt *dw_wdt, enum dw_wdt_rmod rmod)  in dw_wdt_update_mode()  argument
113 	val = readl(dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);  in dw_wdt_update_mode()
118 	writel(val, dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);  in dw_wdt_update_mode()
120 	dw_wdt->rmod = rmod;  in dw_wdt_update_mode()
123 static unsigned int dw_wdt_find_best_top(struct dw_wdt *dw_wdt,  in dw_wdt_find_best_top()  argument
134 		if (dw_wdt->timeouts[idx].sec >= timeout)  in dw_wdt_find_best_top()
141 	*top_val = dw_wdt->timeouts[idx].top_val;  in dw_wdt_find_best_top()
143 	return dw_wdt->timeouts[idx].sec;  in dw_wdt_find_best_top()
146 static unsigned int dw_wdt_get_min_timeout(struct dw_wdt *dw_wdt)  in dw_wdt_get_min_timeout()  argument
155 		if (dw_wdt->timeouts[idx].sec)  in dw_wdt_get_min_timeout()
159 	return dw_wdt->timeouts[idx].sec;  in dw_wdt_get_min_timeout()
162 static unsigned int dw_wdt_get_max_timeout_ms(struct dw_wdt *dw_wdt)  in dw_wdt_get_max_timeout_ms()  argument
164 	struct dw_wdt_timeout *timeout = &dw_wdt->timeouts[DW_WDT_NUM_TOPS - 1];  in dw_wdt_get_max_timeout_ms()
172 static unsigned int dw_wdt_get_timeout(struct dw_wdt *dw_wdt)  in dw_wdt_get_timeout()  argument
174 	int top_val = readl(dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET) & 0xF;  in dw_wdt_get_timeout()
178 		if (dw_wdt->timeouts[idx].top_val == top_val)  in dw_wdt_get_timeout()
186 	return dw_wdt->timeouts[idx].sec * dw_wdt->rmod;  in dw_wdt_get_timeout()
191 	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);  in dw_wdt_ping()  local
193 	writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt->regs +  in dw_wdt_ping()
201 	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);  in dw_wdt_set_timeout()  local
213 	timeout = dw_wdt_find_best_top(dw_wdt, DIV_ROUND_UP(top_s, dw_wdt->rmod),  in dw_wdt_set_timeout()
215 	if (dw_wdt->rmod == DW_WDT_RMOD_IRQ)  in dw_wdt_set_timeout()
227 	       dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);  in dw_wdt_set_timeout()
239 		wdd->timeout = timeout * dw_wdt->rmod;  in dw_wdt_set_timeout()
248 	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);  in dw_wdt_set_pretimeout()  local
255 	dw_wdt_update_mode(dw_wdt, req ? DW_WDT_RMOD_IRQ : DW_WDT_RMOD_RESET);  in dw_wdt_set_pretimeout()
261 static void dw_wdt_arm_system_reset(struct dw_wdt *dw_wdt)  in dw_wdt_arm_system_reset()  argument
263 	u32 val = readl(dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);  in dw_wdt_arm_system_reset()
266 	if (dw_wdt->rmod == DW_WDT_RMOD_IRQ)  in dw_wdt_arm_system_reset()
272 	writel(val, dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);  in dw_wdt_arm_system_reset()
277 	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);  in dw_wdt_start()  local
280 	dw_wdt_ping(&dw_wdt->wdd);  in dw_wdt_start()
281 	dw_wdt_arm_system_reset(dw_wdt);  in dw_wdt_start()
288 	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);  in dw_wdt_stop()  local
290 	if (!dw_wdt->rst) {  in dw_wdt_stop()
295 	reset_control_assert(dw_wdt->rst);  in dw_wdt_stop()
296 	reset_control_deassert(dw_wdt->rst);  in dw_wdt_stop()
304 	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);  in dw_wdt_restart()  local
306 	writel(0, dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);  in dw_wdt_restart()
307 	dw_wdt_update_mode(dw_wdt, DW_WDT_RMOD_RESET);  in dw_wdt_restart()
308 	if (dw_wdt_is_enabled(dw_wdt))  in dw_wdt_restart()
310 		       dw_wdt->regs + WDOG_COUNTER_RESTART_REG_OFFSET);  in dw_wdt_restart()
312 		dw_wdt_arm_system_reset(dw_wdt);  in dw_wdt_restart()
322 	struct dw_wdt *dw_wdt = to_dw_wdt(wdd);  in dw_wdt_get_timeleft()  local
326 	val = readl(dw_wdt->regs + WDOG_CURRENT_COUNT_REG_OFFSET);  in dw_wdt_get_timeleft()
327 	sec = val / dw_wdt->rate;  in dw_wdt_get_timeleft()
329 	if (dw_wdt->rmod == DW_WDT_RMOD_IRQ) {  in dw_wdt_get_timeleft()
330 		val = readl(dw_wdt->regs + WDOG_INTERRUPT_STATUS_REG_OFFSET);  in dw_wdt_get_timeleft()
363 	struct dw_wdt *dw_wdt = devid;  in dw_wdt_irq()  local
370 	val = readl(dw_wdt->regs + WDOG_INTERRUPT_STATUS_REG_OFFSET);  in dw_wdt_irq()
374 	watchdog_notify_pretimeout(&dw_wdt->wdd);  in dw_wdt_irq()
382 	struct dw_wdt *dw_wdt = dev_get_drvdata(dev);  in dw_wdt_suspend()  local
384 	dw_wdt->control = readl(dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);  in dw_wdt_suspend()
385 	dw_wdt->timeout = readl(dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);  in dw_wdt_suspend()
387 	clk_disable_unprepare(dw_wdt->pclk);  in dw_wdt_suspend()
388 	clk_disable_unprepare(dw_wdt->clk);  in dw_wdt_suspend()
395 	struct dw_wdt *dw_wdt = dev_get_drvdata(dev);  in dw_wdt_resume()  local
396 	int err = clk_prepare_enable(dw_wdt->clk);  in dw_wdt_resume()
401 	err = clk_prepare_enable(dw_wdt->pclk);  in dw_wdt_resume()
403 		clk_disable_unprepare(dw_wdt->clk);  in dw_wdt_resume()
407 	writel(dw_wdt->timeout, dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);  in dw_wdt_resume()
408 	writel(dw_wdt->control, dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);  in dw_wdt_resume()
410 	dw_wdt_ping(&dw_wdt->wdd);  in dw_wdt_resume()
426 static void dw_wdt_handle_tops(struct dw_wdt *dw_wdt, const u32 *tops)  in dw_wdt_handle_tops()  argument
440 		tout.sec = tops[val] / dw_wdt->rate;  in dw_wdt_handle_tops()
442 		do_div(msec, dw_wdt->rate);  in dw_wdt_handle_tops()
450 			dst = &dw_wdt->timeouts[tidx];  in dw_wdt_handle_tops()
458 		dw_wdt->timeouts[val] = tout;  in dw_wdt_handle_tops()
462 static int dw_wdt_init_timeouts(struct dw_wdt *dw_wdt, struct device *dev)  in dw_wdt_init_timeouts()  argument
473 	data = readl(dw_wdt->regs + WDOG_COMP_PARAMS_1_REG_OFFSET);  in dw_wdt_init_timeouts()
489 	dw_wdt_handle_tops(dw_wdt, tops);  in dw_wdt_init_timeouts()
490 	if (!dw_wdt->timeouts[DW_WDT_NUM_TOPS - 1].sec) {  in dw_wdt_init_timeouts()
521 static void dw_wdt_dbgfs_init(struct dw_wdt *dw_wdt)  in dw_wdt_dbgfs_init()  argument
523 	struct device *dev = dw_wdt->wdd.parent;  in dw_wdt_dbgfs_init()
532 	regset->base = dw_wdt->regs;  in dw_wdt_dbgfs_init()
534 	dw_wdt->dbgfs_dir = debugfs_create_dir(dev_name(dev), NULL);  in dw_wdt_dbgfs_init()
536 	debugfs_create_regset32("registers", 0444, dw_wdt->dbgfs_dir, regset);  in dw_wdt_dbgfs_init()
539 static void dw_wdt_dbgfs_clear(struct dw_wdt *dw_wdt)  in dw_wdt_dbgfs_clear()  argument
541 	debugfs_remove_recursive(dw_wdt->dbgfs_dir);  in dw_wdt_dbgfs_clear()
546 static void dw_wdt_dbgfs_init(struct dw_wdt *dw_wdt) {}  in dw_wdt_dbgfs_init()  argument
547 static void dw_wdt_dbgfs_clear(struct dw_wdt *dw_wdt) {}  in dw_wdt_dbgfs_clear()  argument
555 	struct dw_wdt *dw_wdt;  in dw_wdt_drv_probe()  local
558 	dw_wdt = devm_kzalloc(dev, sizeof(*dw_wdt), GFP_KERNEL);  in dw_wdt_drv_probe()
559 	if (!dw_wdt)  in dw_wdt_drv_probe()
562 	dw_wdt->regs = devm_platform_ioremap_resource(pdev, 0);  in dw_wdt_drv_probe()
563 	if (IS_ERR(dw_wdt->regs))  in dw_wdt_drv_probe()
564 		return PTR_ERR(dw_wdt->regs);  in dw_wdt_drv_probe()
572 	dw_wdt->clk = devm_clk_get(dev, "tclk");  in dw_wdt_drv_probe()
573 	if (IS_ERR(dw_wdt->clk)) {  in dw_wdt_drv_probe()
574 		dw_wdt->clk = devm_clk_get(dev, NULL);  in dw_wdt_drv_probe()
575 		if (IS_ERR(dw_wdt->clk))  in dw_wdt_drv_probe()
576 			return PTR_ERR(dw_wdt->clk);  in dw_wdt_drv_probe()
579 	ret = clk_prepare_enable(dw_wdt->clk);  in dw_wdt_drv_probe()
583 	dw_wdt->rate = clk_get_rate(dw_wdt->clk);  in dw_wdt_drv_probe()
584 	if (dw_wdt->rate == 0) {  in dw_wdt_drv_probe()
596 	dw_wdt->pclk = devm_clk_get_optional(dev, "pclk");  in dw_wdt_drv_probe()
597 	if (IS_ERR(dw_wdt->pclk)) {  in dw_wdt_drv_probe()
598 		ret = PTR_ERR(dw_wdt->pclk);  in dw_wdt_drv_probe()
602 	ret = clk_prepare_enable(dw_wdt->pclk);  in dw_wdt_drv_probe()
606 	dw_wdt->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL);  in dw_wdt_drv_probe()
607 	if (IS_ERR(dw_wdt->rst)) {  in dw_wdt_drv_probe()
608 		ret = PTR_ERR(dw_wdt->rst);  in dw_wdt_drv_probe()
613 	dw_wdt_update_mode(dw_wdt, DW_WDT_RMOD_RESET);  in dw_wdt_drv_probe()
625 				       pdev->name, dw_wdt);  in dw_wdt_drv_probe()
629 		dw_wdt->wdd.info = &dw_wdt_pt_ident;  in dw_wdt_drv_probe()
634 		dw_wdt->wdd.info = &dw_wdt_ident;  in dw_wdt_drv_probe()
637 	reset_control_deassert(dw_wdt->rst);  in dw_wdt_drv_probe()
639 	ret = dw_wdt_init_timeouts(dw_wdt, dev);  in dw_wdt_drv_probe()
643 	wdd = &dw_wdt->wdd;  in dw_wdt_drv_probe()
645 	wdd->min_timeout = dw_wdt_get_min_timeout(dw_wdt);  in dw_wdt_drv_probe()
646 	wdd->max_hw_heartbeat_ms = dw_wdt_get_max_timeout_ms(dw_wdt);  in dw_wdt_drv_probe()
649 	watchdog_set_drvdata(wdd, dw_wdt);  in dw_wdt_drv_probe()
658 	if (dw_wdt_is_enabled(dw_wdt)) {  in dw_wdt_drv_probe()
659 		wdd->timeout = dw_wdt_get_timeout(dw_wdt);  in dw_wdt_drv_probe()
666 	platform_set_drvdata(pdev, dw_wdt);  in dw_wdt_drv_probe()
674 	dw_wdt_dbgfs_init(dw_wdt);  in dw_wdt_drv_probe()
679 	clk_disable_unprepare(dw_wdt->pclk);  in dw_wdt_drv_probe()
682 	clk_disable_unprepare(dw_wdt->clk);  in dw_wdt_drv_probe()
688 	struct dw_wdt *dw_wdt = platform_get_drvdata(pdev);  in dw_wdt_drv_remove()  local
690 	dw_wdt_dbgfs_clear(dw_wdt);  in dw_wdt_drv_remove()
692 	watchdog_unregister_device(&dw_wdt->wdd);  in dw_wdt_drv_remove()
693 	reset_control_assert(dw_wdt->rst);  in dw_wdt_drv_remove()
694 	clk_disable_unprepare(dw_wdt->pclk);  in dw_wdt_drv_remove()
695 	clk_disable_unprepare(dw_wdt->clk);  in dw_wdt_drv_remove()