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: 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>
This commit is contained in:
Saeed Bishara
Linus Torvalds
parent
a766ae3ebd
commit
aeedacaeaf
@ -27,10 +27,17 @@
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#define RTC_MONTH_OFFS 8
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#define RTC_YEAR_OFFS 16
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#define RTC_ALARM_TIME_REG_OFFS 8
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#define RTC_ALARM_DATE_REG_OFFS 0xc
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#define RTC_ALARM_VALID (1 << 7)
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#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
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#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
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struct rtc_plat_data {
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struct rtc_device *rtc;
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void __iomem *ioaddr;
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int irq;
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};
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static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
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@ -84,12 +91,134 @@ static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
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return rtc_valid_tm(tm);
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}
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static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct rtc_plat_data *pdata = dev_get_drvdata(dev);
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void __iomem *ioaddr = pdata->ioaddr;
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u32 rtc_time, rtc_date;
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unsigned int year, month, day, hour, minute, second, wday;
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rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
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rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
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second = rtc_time & 0x7f;
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minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
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hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
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wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
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day = rtc_date & 0x3f;
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month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
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year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
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alm->time.tm_sec = bcd2bin(second);
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alm->time.tm_min = bcd2bin(minute);
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alm->time.tm_hour = bcd2bin(hour);
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alm->time.tm_mday = bcd2bin(day);
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alm->time.tm_wday = bcd2bin(wday);
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alm->time.tm_mon = bcd2bin(month) - 1;
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/* hw counts from year 2000, but tm_year is relative to 1900 */
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alm->time.tm_year = bcd2bin(year) + 100;
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if (rtc_valid_tm(&alm->time) < 0) {
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dev_err(dev, "retrieved alarm date/time is not valid.\n");
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rtc_time_to_tm(0, &alm->time);
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}
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alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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return 0;
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}
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static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct rtc_plat_data *pdata = dev_get_drvdata(dev);
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void __iomem *ioaddr = pdata->ioaddr;
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u32 rtc_reg = 0;
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if (alm->time.tm_sec >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
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<< RTC_SECONDS_OFFS;
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if (alm->time.tm_min >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
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<< RTC_MINUTES_OFFS;
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if (alm->time.tm_hour >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
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<< RTC_HOURS_OFFS;
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writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
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if (alm->time.tm_mday >= 0)
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rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
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<< RTC_MDAY_OFFS;
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else
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rtc_reg = 0;
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if (alm->time.tm_mon >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
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<< RTC_MONTH_OFFS;
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if (alm->time.tm_year >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year % 100))
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<< RTC_YEAR_OFFS;
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writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
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writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
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writel(alm->enabled ? 1 : 0,
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ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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return 0;
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}
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static int mv_rtc_ioctl(struct device *dev, unsigned int cmd,
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unsigned long arg)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
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void __iomem *ioaddr = pdata->ioaddr;
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if (pdata->irq < 0)
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return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
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switch (cmd) {
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case RTC_AIE_OFF:
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writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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break;
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case RTC_AIE_ON:
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writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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break;
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default:
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return -ENOIOCTLCMD;
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}
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return 0;
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}
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static irqreturn_t mv_rtc_interrupt(int irq, void *data)
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{
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struct rtc_plat_data *pdata = data;
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void __iomem *ioaddr = pdata->ioaddr;
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/* alarm irq? */
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if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
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return IRQ_NONE;
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/* clear interrupt */
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writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
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rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops mv_rtc_ops = {
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.read_time = mv_rtc_read_time,
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.set_time = mv_rtc_set_time,
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};
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static int __init mv_rtc_probe(struct platform_device *pdev)
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static const struct rtc_class_ops mv_rtc_alarm_ops = {
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.read_time = mv_rtc_read_time,
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.set_time = mv_rtc_set_time,
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.read_alarm = mv_rtc_read_alarm,
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.set_alarm = mv_rtc_set_alarm,
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.ioctl = mv_rtc_ioctl,
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};
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static int __devinit mv_rtc_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct rtc_plat_data *pdata;
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@ -130,12 +259,31 @@ static int __init mv_rtc_probe(struct platform_device *pdev)
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}
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}
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pdata->irq = platform_get_irq(pdev, 0);
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platform_set_drvdata(pdev, pdata);
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pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
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&mv_rtc_ops, THIS_MODULE);
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if (pdata->irq >= 0) {
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device_init_wakeup(&pdev->dev, 1);
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pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
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&mv_rtc_alarm_ops,
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THIS_MODULE);
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} else
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pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
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&mv_rtc_ops, THIS_MODULE);
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if (IS_ERR(pdata->rtc))
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return PTR_ERR(pdata->rtc);
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if (pdata->irq >= 0) {
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writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
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IRQF_DISABLED | IRQF_SHARED,
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pdev->name, pdata) < 0) {
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dev_warn(&pdev->dev, "interrupt not available.\n");
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pdata->irq = -1;
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}
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}
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return 0;
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}
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@ -143,6 +291,9 @@ static int __exit mv_rtc_remove(struct platform_device *pdev)
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{
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struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
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if (pdata->irq >= 0)
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device_init_wakeup(&pdev->dev, 0);
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rtc_device_unregister(pdata->rtc);
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return 0;
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}
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