Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit aeedacae authored by Saeed Bishara's avatar Saeed Bishara Committed by Linus Torvalds
Browse files

rtc-mv: add support for Alarm 



This patch adds the Alarm support, this mode enabled when adding
IORESOURCE_IRQ to the platform device resources.

The patch also enables the wakeup mode, so the wakealarm sysfs file (under
/sys/class/rtc/rtcX/) can be used to configure the alarm clock.

Signed-off-by: default avatarSaeed Bishara <saeed@marvell.com>
Signed-off-by: default avatarNicolas Pitre <nico@marvell.com>
Signed-off-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a766ae3e

drivers/rtc/rtc-mv.c

+154 −3
Original line number Diff line number Diff line
@@ -27,10 +27,17 @@ 
#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		(1 << 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;

};



static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
@@ -84,12 +91,134 @@ static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm) 
	return rtc_valid_tm(tm);

}



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 hours 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;



	if (rtc_valid_tm(&alm->time) < 0) {

		dev_err(dev, "retrieved alarm date/time is not valid.\n");

		rtc_time_to_tm(0, &alm->time);

	}



	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

	return 0;

}



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_ioctl(struct device *dev, unsigned int cmd,

			unsigned long arg)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	void __iomem *ioaddr = pdata->ioaddr;



	if (pdata->irq < 0)

		return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */

	switch (cmd) {

	case RTC_AIE_OFF:

		writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

		break;

	case RTC_AIE_ON:

		writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

		break;

	default:

		return -ENOIOCTLCMD;

	}

	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,

};



static int __init mv_rtc_probe(struct platform_device *pdev)

static const struct rtc_class_ops mv_rtc_alarm_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,

	.ioctl		= mv_rtc_ioctl,

};



static int __devinit mv_rtc_probe(struct platform_device *pdev)

{

	struct resource *res;

	struct rtc_plat_data *pdata;
@@ -130,12 +259,31 @@ static int __init mv_rtc_probe(struct platform_device *pdev) 
		}

	}



	pdata->irq = platform_get_irq(pdev, 0);



	platform_set_drvdata(pdev, pdata);



	if (pdata->irq >= 0) {

		device_init_wakeup(&pdev->dev, 1);

		pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,

						 &mv_rtc_alarm_ops,

						 THIS_MODULE);

	} else

		pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,

						 &mv_rtc_ops, THIS_MODULE);

	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_DISABLED | IRQF_SHARED,

				     pdev->name, pdata) < 0) {

			dev_warn(&pdev->dev, "interrupt not available.\n");

			pdata->irq = -1;

		}

	}



	return 0;

}
@@ -143,6 +291,9 @@ static int __exit mv_rtc_remove(struct platform_device *pdev) 
{

	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);



	if (pdata->irq >= 0)

		device_init_wakeup(&pdev->dev, 0);



	rtc_device_unregister(pdata->rtc);

	return 0;

}