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rtc-mv: add support for Alarm
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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: Saeed Bishara <saeed@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Saeed Bishara authored and Linus Torvalds committed Dec 16, 2009
1 parent a766ae3 commit aeedaca
Showing 1 changed file with 154 additions and 3 deletions.
157 changes: 154 additions & 3 deletions drivers/rtc/rtc-mv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -130,19 +259,41 @@ static int __init mv_rtc_probe(struct platform_device *pdev)
}
}

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

platform_set_drvdata(pdev, pdata);
pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
&mv_rtc_ops, THIS_MODULE);

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;
}

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;
}
Expand Down

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