// SPDX-License-Identifier: GPL-2.0/* * Driver for the RTC in Marvell SoCs. */ #include <linux/init.h>#include <linux/kernel.h>#include <linux/rtc.h>#include <linux/bcd.h>#include <linux/bitops.h>#include <linux/io.h>#include <linux/platform_device.h>#include <linux/of.h>#include <linux/delay.h>#include <linux/clk.h>#include <linux/gfp.h>#include <linux/module.h>  #define RTC_TIME_REG_OFFS	0#define RTC_SECONDS_OFFS	0#define RTC_MINUTES_OFFS	8#define RTC_HOURS_OFFS		16#define RTC_WDAY_OFFS		24#define RTC_HOURS_12H_MODE	BIT(22) /* 12 hour mode */ #define RTC_DATE_REG_OFFS	4#define RTC_MDAY_OFFS		0#define RTC_MONTH_OFFS		8#define RTC_YEAR_OFFS		16 #define RTC_ALARM_TIME_REG_OFFS	8#define RTC_ALARM_DATE_REG_OFFS	0xc#define RTC_ALARM_VALID		BIT(7) #define RTC_ALARM_INTERRUPT_MASK_REG_OFFS	0x10#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS	0x14 struct rtc_plat_data {	struct rtc_device *rtc;	void __iomem *ioaddr;	int		irq;	struct clk	*clk;}; static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm){	struct rtc_plat_data *pdata = dev_get_drvdata(dev);	void __iomem *ioaddr = pdata->ioaddr;	u32	rtc_reg; 	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |		(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |		(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |		(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS); 	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |		(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |		(bin2bcd(tm->tm_year - 100) << RTC_YEAR_OFFS);	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS); 	return 0;} static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm){	struct rtc_plat_data *pdata = dev_get_drvdata(dev);	void __iomem *ioaddr = pdata->ioaddr;	u32	rtc_time, rtc_date;	unsigned int year, month, day, hour, minute, second, wday; 	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS); 	second = rtc_time & 0x7f;	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7; 	day = rtc_date & 0x3f;	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff; 	tm->tm_sec = bcd2bin(second);	tm->tm_min = bcd2bin(minute);	tm->tm_hour = bcd2bin(hour);	tm->tm_mday = bcd2bin(day);	tm->tm_wday = bcd2bin(wday);	tm->tm_mon = bcd2bin(month) - 1;	/* hw counts from year 2000, but tm_year is relative to 1900 */	tm->tm_year = bcd2bin(year) + 100; 	return 0;} static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm){	struct rtc_plat_data *pdata = dev_get_drvdata(dev);	void __iomem *ioaddr = pdata->ioaddr;	u32	rtc_time, rtc_date;	unsigned int year, month, day, hour, minute, second, wday; 	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS); 	second = rtc_time & 0x7f;	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7; 	day = rtc_date & 0x3f;	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff; 	alm->time.tm_sec = bcd2bin(second);	alm->time.tm_min = bcd2bin(minute);	alm->time.tm_hour = bcd2bin(hour);	alm->time.tm_mday = bcd2bin(day);	alm->time.tm_wday = bcd2bin(wday);	alm->time.tm_mon = bcd2bin(month) - 1;	/* hw counts from year 2000, but tm_year is relative to 1900 */	alm->time.tm_year = bcd2bin(year) + 100; 	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS); 	return rtc_valid_tm(&alm->time);} static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm){	struct rtc_plat_data *pdata = dev_get_drvdata(dev);	void __iomem *ioaddr = pdata->ioaddr;	u32 rtc_reg = 0; 	if (alm->time.tm_sec >= 0)		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))			<< RTC_SECONDS_OFFS;	if (alm->time.tm_min >= 0)		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))			<< RTC_MINUTES_OFFS;	if (alm->time.tm_hour >= 0)		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))			<< RTC_HOURS_OFFS; 	writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS); 	if (alm->time.tm_mday >= 0)		rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))			<< RTC_MDAY_OFFS;	else		rtc_reg = 0; 	if (alm->time.tm_mon >= 0)		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))			<< RTC_MONTH_OFFS; 	if (alm->time.tm_year >= 0)		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year - 100))			<< RTC_YEAR_OFFS; 	writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);	writel(alm->enabled ? 1 : 0,	       ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS); 	return 0;} static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled){	struct rtc_plat_data *pdata = dev_get_drvdata(dev);	void __iomem *ioaddr = pdata->ioaddr; 	if (pdata->irq < 0)		return -EINVAL; /* fall back into rtc-dev's emulation */ 	if (enabled)		writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);	else		writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);	return 0;} static irqreturn_t mv_rtc_interrupt(int irq, void *data){	struct rtc_plat_data *pdata = data;	void __iomem *ioaddr = pdata->ioaddr; 	/* alarm irq? */	if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))		return IRQ_NONE; 	/* clear interrupt */	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);	rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);	return IRQ_HANDLED;} static const struct rtc_class_ops mv_rtc_ops = {	.read_time	= mv_rtc_read_time,	.set_time	= mv_rtc_set_time,	.read_alarm	= mv_rtc_read_alarm,	.set_alarm	= mv_rtc_set_alarm,	.alarm_irq_enable = mv_rtc_alarm_irq_enable,}; static int __init mv_rtc_probe(struct platform_device *pdev){	struct rtc_plat_data *pdata;	u32 rtc_time;	int ret = 0; 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);	if (!pdata)		return -ENOMEM; 	pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);	if (IS_ERR(pdata->ioaddr))		return PTR_ERR(pdata->ioaddr); 	pdata->clk = devm_clk_get_optional_prepared(&pdev->dev, NULL);	if (IS_ERR(pdata->clk))		return PTR_ERR(pdata->clk); 	/* make sure the 24 hour mode is enabled */	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);	if (rtc_time & RTC_HOURS_12H_MODE) {		dev_err(&pdev->dev, "12 Hour mode is enabled but not supported.\n");		return  -EINVAL;	} 	/* make sure it is actually functional */	if (rtc_time == 0x01000000) {		ssleep(1);		rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);		if (rtc_time == 0x01000000) {			dev_err(&pdev->dev, "internal RTC not ticking\n");			return -ENODEV;		}	} 	pdata->irq = platform_get_irq(pdev, 0); 	platform_set_drvdata(pdev, pdata); 	pdata->rtc = devm_rtc_allocate_device(&pdev->dev);	if (IS_ERR(pdata->rtc)) {		return PTR_ERR(pdata->rtc);	} 	if (pdata->irq >= 0) {		writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);		if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,				     IRQF_SHARED,				     pdev->name, pdata) < 0) {			dev_warn(&pdev->dev, "interrupt not available.\n");			pdata->irq = -1;		}	} 	if (pdata->irq >= 0)		devm_device_init_wakeup(&pdev->dev);	else		clear_bit(RTC_FEATURE_ALARM, pdata->rtc->features); 	pdata->rtc->ops = &mv_rtc_ops;	pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;	pdata->rtc->range_max = RTC_TIMESTAMP_END_2099; 	ret = devm_rtc_register_device(pdata->rtc);	if (!ret)		return 0; 	return ret;} #ifdef CONFIG_OFstatic const struct of_device_id rtc_mv_of_match_table[] = {	{ .compatible = "marvell,orion-rtc", },	{}};MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);#endif #ifdef CONFIG_PM_SLEEPstatic int mv_rtc_suspend(struct device *dev){	struct rtc_plat_data *pdata = dev_get_drvdata(dev); 	if (device_may_wakeup(dev) && pdata->irq >= 0)		enable_irq_wake(pdata->irq);	return 0;} static int mv_rtc_resume(struct device *dev){	struct rtc_plat_data *pdata = dev_get_drvdata(dev); 	if (device_may_wakeup(dev) && pdata->irq >= 0)		disable_irq_wake(pdata->irq);	return 0;}#endif static SIMPLE_DEV_PM_OPS(mv_rtc_pm_ops, mv_rtc_suspend, mv_rtc_resume); static struct platform_driver mv_rtc_driver = {	.driver		= {		.name	= "rtc-mv",		.of_match_table = of_match_ptr(rtc_mv_of_match_table),		.pm	= &mv_rtc_pm_ops,	},}; module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe); MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");MODULE_DESCRIPTION("Marvell RTC driver");MODULE_LICENSE("GPL");MODULE_ALIAS("platform:rtc-mv");