1 // SPDX-License-Identifier: GPL-2.0+
14 #include <linux/rtc.h>
36 	struct rtc_device *rtc;  member
42 static u32 bbnsm_read_counter(struct bbnsm_rtc *bbnsm)  in bbnsm_read_counter()  argument
52 		regmap_read(bbnsm->regmap, BBNSM_RTC_MS, &rtc_msb);  in bbnsm_read_counter()
54 		regmap_read(bbnsm->regmap, BBNSM_RTC_LS, &rtc_lsb);  in bbnsm_read_counter()
57 	} while (tmp != time && --timeout);  in bbnsm_read_counter()
64 	struct bbnsm_rtc *bbnsm = dev_get_drvdata(dev);  in bbnsm_rtc_read_time()  local
68 	regmap_read(bbnsm->regmap, BBNSM_CTRL, &val);  in bbnsm_rtc_read_time()
70 		return -EINVAL;  in bbnsm_rtc_read_time()
72 	time = bbnsm_read_counter(bbnsm);  in bbnsm_rtc_read_time()
80 	struct bbnsm_rtc *bbnsm = dev_get_drvdata(dev);  in bbnsm_rtc_set_time()  local
83 	/* disable the RTC first */  in bbnsm_rtc_set_time()
84 	regmap_update_bits(bbnsm->regmap, BBNSM_CTRL, RTC_EN_MSK, 0);  in bbnsm_rtc_set_time()
87 	regmap_write(bbnsm->regmap, BBNSM_RTC_LS, time << CNTR_TO_SECS_SH);  in bbnsm_rtc_set_time()
88 	regmap_write(bbnsm->regmap, BBNSM_RTC_MS, time >> (32 - CNTR_TO_SECS_SH));  in bbnsm_rtc_set_time()
90 	/* Enable the RTC again */  in bbnsm_rtc_set_time()
91 	regmap_update_bits(bbnsm->regmap, BBNSM_CTRL, RTC_EN_MSK, RTC_EN);  in bbnsm_rtc_set_time()
98 	struct bbnsm_rtc *bbnsm = dev_get_drvdata(dev);  in bbnsm_rtc_read_alarm()  local
101 	regmap_read(bbnsm->regmap, BBNSM_TA, &bbnsm_ta);  in bbnsm_rtc_read_alarm()
102 	rtc_time64_to_tm(bbnsm_ta, &alrm->time);  in bbnsm_rtc_read_alarm()
104 	regmap_read(bbnsm->regmap, BBNSM_EVENTS, &bbnsm_events);  in bbnsm_rtc_read_alarm()
105 	alrm->pending = (bbnsm_events & BBNSM_EVENT_TA) ? 1 : 0;  in bbnsm_rtc_read_alarm()
112 	struct bbnsm_rtc *bbnsm = dev_get_drvdata(dev);  in bbnsm_rtc_alarm_irq_enable()  local
115 	regmap_update_bits(bbnsm->regmap, BBNSM_CTRL, TA_EN_MSK, enable ? TA_EN : TA_DIS);  in bbnsm_rtc_alarm_irq_enable()
117 	regmap_update_bits(bbnsm->regmap, BBNSM_INT_EN, TA_EN_MSK, enable ? TA_EN : TA_DIS);  in bbnsm_rtc_alarm_irq_enable()
124 	struct bbnsm_rtc *bbnsm = dev_get_drvdata(dev);  in bbnsm_rtc_set_alarm()  local
125 	unsigned long time = rtc_tm_to_time64(&alrm->time);  in bbnsm_rtc_set_alarm()
128 	regmap_update_bits(bbnsm->regmap, BBNSM_CTRL, TA_EN, TA_EN);  in bbnsm_rtc_set_alarm()
131 	regmap_write(bbnsm->regmap, BBNSM_TA, time);  in bbnsm_rtc_set_alarm()
133 	return bbnsm_rtc_alarm_irq_enable(dev, alrm->enabled);  in bbnsm_rtc_set_alarm()
147 	struct bbnsm_rtc  *bbnsm = dev_get_drvdata(dev);  in bbnsm_rtc_irq_handler()  local
150 	regmap_read(bbnsm->regmap, BBNSM_EVENTS, &val);  in bbnsm_rtc_irq_handler()
154 		regmap_write_bits(bbnsm->regmap, BBNSM_EVENTS, TA_EN_MSK, BBNSM_EVENT_TA);  in bbnsm_rtc_irq_handler()
155 		rtc_update_irq(bbnsm->rtc, 1, RTC_AF | RTC_IRQF);  in bbnsm_rtc_irq_handler()
165 	struct device_node *np = pdev->dev.of_node;  in bbnsm_rtc_probe()
166 	struct bbnsm_rtc *bbnsm;  in bbnsm_rtc_probe()  local
169 	bbnsm = devm_kzalloc(&pdev->dev, sizeof(*bbnsm), GFP_KERNEL);  in bbnsm_rtc_probe()
170 	if (!bbnsm)  in bbnsm_rtc_probe()
171 		return -ENOMEM;  in bbnsm_rtc_probe()
173 	bbnsm->rtc = devm_rtc_allocate_device(&pdev->dev);  in bbnsm_rtc_probe()
174 	if (IS_ERR(bbnsm->rtc))  in bbnsm_rtc_probe()
175 		return PTR_ERR(bbnsm->rtc);  in bbnsm_rtc_probe()
177 	bbnsm->regmap = syscon_node_to_regmap(np->parent);  in bbnsm_rtc_probe()
178 	if (IS_ERR(bbnsm->regmap)) {  in bbnsm_rtc_probe()
179 		dev_dbg(&pdev->dev, "bbnsm get regmap failed\n");  in bbnsm_rtc_probe()
180 		return PTR_ERR(bbnsm->regmap);  in bbnsm_rtc_probe()
183 	bbnsm->irq = platform_get_irq(pdev, 0);  in bbnsm_rtc_probe()
184 	if (bbnsm->irq < 0)  in bbnsm_rtc_probe()
185 		return bbnsm->irq;  in bbnsm_rtc_probe()
187 	platform_set_drvdata(pdev, bbnsm);  in bbnsm_rtc_probe()
190 	regmap_write(bbnsm->regmap, BBNSM_EVENTS, 0x7A);  in bbnsm_rtc_probe()
192 	device_init_wakeup(&pdev->dev, true);  in bbnsm_rtc_probe()
193 	dev_pm_set_wake_irq(&pdev->dev, bbnsm->irq);  in bbnsm_rtc_probe()
195 	ret = devm_request_irq(&pdev->dev, bbnsm->irq, bbnsm_rtc_irq_handler,  in bbnsm_rtc_probe()
196 			       IRQF_SHARED, "rtc alarm", &pdev->dev);  in bbnsm_rtc_probe()
198 		dev_err(&pdev->dev, "failed to request irq %d: %d\n",  in bbnsm_rtc_probe()
199 			bbnsm->irq, ret);  in bbnsm_rtc_probe()
203 	bbnsm->rtc->ops = &bbnsm_rtc_ops;  in bbnsm_rtc_probe()
204 	bbnsm->rtc->range_max = U32_MAX;  in bbnsm_rtc_probe()
206 	ret = devm_rtc_register_device(bbnsm->rtc);  in bbnsm_rtc_probe()
213 	dev_pm_clear_wake_irq(&pdev->dev);  in bbnsm_rtc_probe()
214 	device_init_wakeup(&pdev->dev, false);  in bbnsm_rtc_probe()
220 	dev_pm_clear_wake_irq(&pdev->dev);  in bbnsm_rtc_remove()
221 	device_init_wakeup(&pdev->dev, false);  in bbnsm_rtc_remove()
225 	{ .compatible = "nxp,imx93-bbnsm-rtc" },
241 MODULE_DESCRIPTION("NXP BBNSM RTC Driver");