1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) STMicroelectronics 2019 - All Rights Reserved
11 #include <linux/mfd/stm32-lptimer.h>
40 	regmap_write(priv->reg, STM32_LPTIM_CR, 0);  in stm32_clkevent_lp_shutdown()
41 	regmap_write(priv->reg, STM32_LPTIM_IER, 0);  in stm32_clkevent_lp_shutdown()
43 	regmap_write(priv->reg, STM32_LPTIM_ICR, STM32_LPTIM_ARRMCF);  in stm32_clkevent_lp_shutdown()
55 	regmap_write(priv->reg, STM32_LPTIM_CR, 0);  in stm32_clkevent_lp_set_timer()
57 	regmap_write(priv->reg, STM32_LPTIM_IER, STM32_LPTIM_ARRMIE);  in stm32_clkevent_lp_set_timer()
59 	regmap_write(priv->reg, STM32_LPTIM_CR, STM32_LPTIM_ENABLE);  in stm32_clkevent_lp_set_timer()
60 	/* set next event counter */  in stm32_clkevent_lp_set_timer()
61 	regmap_write(priv->reg, STM32_LPTIM_ARR, evt);  in stm32_clkevent_lp_set_timer()
63 	/* start counter */  in stm32_clkevent_lp_set_timer()
65 		regmap_write(priv->reg, STM32_LPTIM_CR,  in stm32_clkevent_lp_set_timer()
68 		regmap_write(priv->reg, STM32_LPTIM_CR,  in stm32_clkevent_lp_set_timer()
85 	return stm32_clkevent_lp_set_timer(priv->period, clkevt, true);  in stm32_clkevent_lp_set_periodic()
92 	return stm32_clkevent_lp_set_timer(priv->period, clkevt, false);  in stm32_clkevent_lp_set_oneshot()
100 	regmap_write(priv->reg, STM32_LPTIM_ICR, STM32_LPTIM_ARRMCF);  in stm32_clkevent_lp_irq_handler()
102 	if (clkevt->event_handler)  in stm32_clkevent_lp_irq_handler()
103 		clkevt->event_handler(clkevt);  in stm32_clkevent_lp_irq_handler()
118 	regmap_write(priv->reg, STM32_LPTIM_CFGR, i << CFGR_PSC_OFFSET);  in stm32_clkevent_lp_set_prescaler()
122 	priv->period = DIV_ROUND_UP(*rate, HZ);  in stm32_clkevent_lp_set_prescaler()
128 	priv->clkevt.name = np->full_name;  in stm32_clkevent_lp_init()
129 	priv->clkevt.cpumask = cpu_possible_mask;  in stm32_clkevent_lp_init()
130 	priv->clkevt.features = CLOCK_EVT_FEAT_PERIODIC |  in stm32_clkevent_lp_init()
132 	priv->clkevt.set_state_shutdown = stm32_clkevent_lp_shutdown;  in stm32_clkevent_lp_init()
133 	priv->clkevt.set_state_periodic = stm32_clkevent_lp_set_periodic;  in stm32_clkevent_lp_init()
134 	priv->clkevt.set_state_oneshot = stm32_clkevent_lp_set_oneshot;  in stm32_clkevent_lp_init()
135 	priv->clkevt.set_next_event = stm32_clkevent_lp_set_next_event;  in stm32_clkevent_lp_init()
136 	priv->clkevt.rating = STM32_LP_RATING;  in stm32_clkevent_lp_init()
138 	clockevents_config_and_register(&priv->clkevt, rate, 0x1,  in stm32_clkevent_lp_init()
144 	struct stm32_lptimer *ddata = dev_get_drvdata(pdev->dev.parent);  in stm32_clkevent_lp_probe()
149 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in stm32_clkevent_lp_probe()
151 		return -ENOMEM;  in stm32_clkevent_lp_probe()
153 	priv->reg = ddata->regmap;  in stm32_clkevent_lp_probe()
154 	ret = clk_prepare_enable(ddata->clk);  in stm32_clkevent_lp_probe()
156 		return -EINVAL;  in stm32_clkevent_lp_probe()
158 	rate = clk_get_rate(ddata->clk);  in stm32_clkevent_lp_probe()
160 		ret = -EINVAL;  in stm32_clkevent_lp_probe()
164 	irq = platform_get_irq(to_platform_device(pdev->dev.parent), 0);  in stm32_clkevent_lp_probe()
170 	if (of_property_read_bool(pdev->dev.parent->of_node, "wakeup-source")) {  in stm32_clkevent_lp_probe()
171 		ret = device_init_wakeup(&pdev->dev, true);  in stm32_clkevent_lp_probe()
175 		ret = dev_pm_set_wake_irq(&pdev->dev, irq);  in stm32_clkevent_lp_probe()
180 	ret = devm_request_irq(&pdev->dev, irq, stm32_clkevent_lp_irq_handler,  in stm32_clkevent_lp_probe()
181 			       IRQF_TIMER, pdev->name, &priv->clkevt);  in stm32_clkevent_lp_probe()
187 	stm32_clkevent_lp_init(priv, pdev->dev.parent->of_node, rate);  in stm32_clkevent_lp_probe()
189 	priv->dev = &pdev->dev;  in stm32_clkevent_lp_probe()
194 	clk_disable_unprepare(ddata->clk);  in stm32_clkevent_lp_probe()
199 	{ .compatible = "st,stm32-lptimer-timer", },
207 		.name = "stm32-lptimer-timer",
214 MODULE_ALIAS("platform:stm32-lptimer-timer");
215 MODULE_DESCRIPTION("STMicroelectronics STM32 clockevent low power driver");