1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) STMicroelectronics 2019 - All Rights Reserved
11 #include <linux/mfd/stm32-lptimer.h>
42 	regmap_write(priv->reg, STM32_LPTIM_CR, 0);  in stm32_clkevent_lp_shutdown()
43 	regmap_write(priv->reg, STM32_LPTIM_IER, 0);  in stm32_clkevent_lp_shutdown()
45 	regmap_write(priv->reg, STM32_LPTIM_ICR, STM32_LPTIM_ARRMCF);  in stm32_clkevent_lp_shutdown()
57 	regmap_write(priv->reg, STM32_LPTIM_CR, 0);  in stm32_clkevent_lp_set_timer()
59 	regmap_write(priv->reg, STM32_LPTIM_IER, STM32_LPTIM_ARRMIE);  in stm32_clkevent_lp_set_timer()
61 	regmap_write(priv->reg, STM32_LPTIM_CR, STM32_LPTIM_ENABLE);  in stm32_clkevent_lp_set_timer()
62 	/* set next event counter */  in stm32_clkevent_lp_set_timer()
63 	regmap_write(priv->reg, STM32_LPTIM_ARR, evt);  in stm32_clkevent_lp_set_timer()
65 	/* start counter */  in stm32_clkevent_lp_set_timer()
67 		regmap_write(priv->reg, STM32_LPTIM_CR,  in stm32_clkevent_lp_set_timer()
70 		regmap_write(priv->reg, STM32_LPTIM_CR,  in stm32_clkevent_lp_set_timer()
87 	return stm32_clkevent_lp_set_timer(priv->period, clkevt, true);  in stm32_clkevent_lp_set_periodic()
94 	return stm32_clkevent_lp_set_timer(priv->period, clkevt, false);  in stm32_clkevent_lp_set_oneshot()
102 	regmap_write(priv->reg, STM32_LPTIM_ICR, STM32_LPTIM_ARRMCF);  in stm32_clkevent_lp_irq_handler()
104 	if (clkevt->event_handler)  in stm32_clkevent_lp_irq_handler()
105 		clkevt->event_handler(clkevt);  in stm32_clkevent_lp_irq_handler()
120 	regmap_write(priv->reg, STM32_LPTIM_CFGR, i << CFGR_PSC_OFFSET);  in stm32_clkevent_lp_set_prescaler()
124 	priv->period = DIV_ROUND_UP(*rate, HZ);  in stm32_clkevent_lp_set_prescaler()
125 	priv->psc = i;  in stm32_clkevent_lp_set_prescaler()
135 	clk_disable_unprepare(priv->clk);  in stm32_clkevent_lp_suspend()
142 	clk_prepare_enable(priv->clk);  in stm32_clkevent_lp_resume()
145 	regmap_write(priv->reg, STM32_LPTIM_CFGR, priv->psc << CFGR_PSC_OFFSET);  in stm32_clkevent_lp_resume()
151 	priv->clkevt.name = np->full_name;  in stm32_clkevent_lp_init()
152 	priv->clkevt.cpumask = cpu_possible_mask;  in stm32_clkevent_lp_init()
153 	priv->clkevt.features = CLOCK_EVT_FEAT_PERIODIC |  in stm32_clkevent_lp_init()
155 	priv->clkevt.set_state_shutdown = stm32_clkevent_lp_shutdown;  in stm32_clkevent_lp_init()
156 	priv->clkevt.set_state_periodic = stm32_clkevent_lp_set_periodic;  in stm32_clkevent_lp_init()
157 	priv->clkevt.set_state_oneshot = stm32_clkevent_lp_set_oneshot;  in stm32_clkevent_lp_init()
158 	priv->clkevt.set_next_event = stm32_clkevent_lp_set_next_event;  in stm32_clkevent_lp_init()
159 	priv->clkevt.rating = STM32_LP_RATING;  in stm32_clkevent_lp_init()
160 	priv->clkevt.suspend = stm32_clkevent_lp_suspend;  in stm32_clkevent_lp_init()
161 	priv->clkevt.resume = stm32_clkevent_lp_resume;  in stm32_clkevent_lp_init()
163 	clockevents_config_and_register(&priv->clkevt, rate, 0x1,  in stm32_clkevent_lp_init()
169 	struct stm32_lptimer *ddata = dev_get_drvdata(pdev->dev.parent);  in stm32_clkevent_lp_probe()
174 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in stm32_clkevent_lp_probe()
176 		return -ENOMEM;  in stm32_clkevent_lp_probe()
178 	priv->reg = ddata->regmap;  in stm32_clkevent_lp_probe()
179 	priv->clk = ddata->clk;  in stm32_clkevent_lp_probe()
180 	ret = clk_prepare_enable(priv->clk);  in stm32_clkevent_lp_probe()
182 		return -EINVAL;  in stm32_clkevent_lp_probe()
184 	rate = clk_get_rate(priv->clk);  in stm32_clkevent_lp_probe()
186 		ret = -EINVAL;  in stm32_clkevent_lp_probe()
190 	irq = platform_get_irq(to_platform_device(pdev->dev.parent), 0);  in stm32_clkevent_lp_probe()
196 	if (of_property_read_bool(pdev->dev.parent->of_node, "wakeup-source")) {  in stm32_clkevent_lp_probe()
197 		device_set_wakeup_capable(&pdev->dev, true);  in stm32_clkevent_lp_probe()
199 		ret = dev_pm_set_wake_irq(&pdev->dev, irq);  in stm32_clkevent_lp_probe()
204 	ret = devm_request_irq(&pdev->dev, irq, stm32_clkevent_lp_irq_handler,  in stm32_clkevent_lp_probe()
205 			       IRQF_TIMER, pdev->name, &priv->clkevt);  in stm32_clkevent_lp_probe()
211 	stm32_clkevent_lp_init(priv, pdev->dev.parent->of_node, rate);  in stm32_clkevent_lp_probe()
213 	priv->dev = &pdev->dev;  in stm32_clkevent_lp_probe()
218 	clk_disable_unprepare(priv->clk);  in stm32_clkevent_lp_probe()
223 	{ .compatible = "st,stm32-lptimer-timer", },
231 		.name = "stm32-lptimer-timer",
238 MODULE_ALIAS("platform:stm32-lptimer-timer");
239 MODULE_DESCRIPTION("STMicroelectronics STM32 clockevent low power driver");