rtc: add Freescale MC13783 RTC driver
This driver provides support for the RTC part integrated into the Freescale MC13783 PMIC and bases on patch created earlier by Sascha Hauer. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Valentin Longchamp <valentin.longchamp@epfl.ch> Cc: Paul Gortmaker <p_gortmaker@yahoo.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:
Uwe Kleine-König
Linus Torvalds
parent
6f38b0436f
commit
43299f2859
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@ -846,4 +846,10 @@ config RTC_DRV_PCAP
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If you say Y here you will get support for the RTC found on
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the PCAP2 ASIC used on some Motorola phones.
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config RTC_DRV_MC13783
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depends on MFD_MC13783
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tristate "Freescale MC13783 RTC"
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help
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This enables support for the Freescale MC13783 PMIC RTC
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endif # RTC_CLASS
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@ -52,6 +52,7 @@ obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
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obj-$(CONFIG_RTC_MXC) += rtc-mxc.o
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obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
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obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
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obj-$(CONFIG_RTC_DRV_MC13783) += rtc-mc13783.o
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obj-$(CONFIG_RTC_DRV_MSM6242) += rtc-msm6242.o
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obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
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obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
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@ -0,0 +1,262 @@
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/*
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* Real Time Clock driver for Freescale MC13783 PMIC
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*
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* (C) 2009 Sascha Hauer, Pengutronix
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* (C) 2009 Uwe Kleine-Koenig, Pengutronix
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/mfd/mc13783.h>
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#include <linux/platform_device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rtc.h>
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#define DRIVER_NAME "mc13783-rtc"
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#define MC13783_RTCTOD 20
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#define MC13783_RTCTODA 21
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#define MC13783_RTCDAY 22
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#define MC13783_RTCDAYA 23
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struct mc13783_rtc {
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struct rtc_device *rtc;
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struct mc13783 *mc13783;
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int valid;
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};
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static int mc13783_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct mc13783_rtc *priv = dev_get_drvdata(dev);
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unsigned int seconds, days1, days2;
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unsigned long s1970;
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int ret;
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mc13783_lock(priv->mc13783);
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if (!priv->valid) {
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ret = -ENODATA;
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goto out;
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}
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ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days1);
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if (unlikely(ret))
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goto out;
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ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTOD, &seconds);
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if (unlikely(ret))
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goto out;
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ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days2);
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out:
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mc13783_unlock(priv->mc13783);
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if (ret)
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return ret;
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if (days2 == days1 + 1) {
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if (seconds >= 86400 / 2)
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days2 = days1;
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else
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days1 = days2;
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}
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if (days1 != days2)
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return -EIO;
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s1970 = days1 * 86400 + seconds;
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rtc_time_to_tm(s1970, tm);
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return rtc_valid_tm(tm);
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}
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static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs)
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{
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struct mc13783_rtc *priv = dev_get_drvdata(dev);
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unsigned int seconds, days;
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int ret;
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seconds = secs % 86400;
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days = secs / 86400;
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mc13783_lock(priv->mc13783);
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/*
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* first write seconds=0 to prevent a day switch between writing days
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* and seconds below
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*/
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ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTOD, 0);
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if (unlikely(ret))
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goto out;
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ret = mc13783_reg_write(priv->mc13783, MC13783_RTCDAY, days);
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if (unlikely(ret))
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goto out;
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ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTOD, seconds);
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if (unlikely(ret))
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goto out;
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ret = mc13783_ackirq(priv->mc13783, MC13783_IRQ_RTCRST);
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if (unlikely(ret))
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goto out;
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ret = mc13783_unmask(priv->mc13783, MC13783_IRQ_RTCRST);
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out:
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priv->valid = !ret;
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mc13783_unlock(priv->mc13783);
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return ret;
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}
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static irqreturn_t mc13783_rtc_update_handler(int irq, void *dev)
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{
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struct mc13783_rtc *priv = dev;
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struct mc13783 *mc13783 = priv->mc13783;
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dev_dbg(&priv->rtc->dev, "1HZ\n");
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rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);
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mc13783_ackirq(mc13783, irq);
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return IRQ_HANDLED;
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}
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static int mc13783_rtc_update_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct mc13783_rtc *priv = dev_get_drvdata(dev);
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int ret = -ENODATA;
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mc13783_lock(priv->mc13783);
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if (!priv->valid)
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goto out;
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ret = (enabled ? mc13783_unmask : mc13783_mask)(priv->mc13783,
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MC13783_IRQ_1HZ);
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out:
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mc13783_unlock(priv->mc13783);
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return ret;
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}
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static const struct rtc_class_ops mc13783_rtc_ops = {
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.read_time = mc13783_rtc_read_time,
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.set_mmss = mc13783_rtc_set_mmss,
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.update_irq_enable = mc13783_rtc_update_irq_enable,
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};
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static irqreturn_t mc13783_rtc_reset_handler(int irq, void *dev)
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{
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struct mc13783_rtc *priv = dev;
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struct mc13783 *mc13783 = priv->mc13783;
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dev_dbg(&priv->rtc->dev, "RTCRST\n");
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priv->valid = 0;
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mc13783_mask(mc13783, irq);
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return IRQ_HANDLED;
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}
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static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
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{
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int ret;
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struct mc13783_rtc *priv;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
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platform_set_drvdata(pdev, priv);
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priv->valid = 1;
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mc13783_lock(priv->mc13783);
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ret = mc13783_irq_request(priv->mc13783, MC13783_IRQ_RTCRST,
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mc13783_rtc_reset_handler, DRIVER_NAME, priv);
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if (ret)
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goto err_reset_irq_request;
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ret = mc13783_irq_request_nounmask(priv->mc13783, MC13783_IRQ_1HZ,
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mc13783_rtc_update_handler, DRIVER_NAME, priv);
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if (ret)
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goto err_update_irq_request;
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mc13783_unlock(priv->mc13783);
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priv->rtc = rtc_device_register(pdev->name,
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&pdev->dev, &mc13783_rtc_ops, THIS_MODULE);
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if (IS_ERR(priv->rtc)) {
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ret = PTR_ERR(priv->rtc);
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mc13783_lock(priv->mc13783);
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mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
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err_update_irq_request:
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mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);
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err_reset_irq_request:
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mc13783_unlock(priv->mc13783);
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platform_set_drvdata(pdev, NULL);
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kfree(priv);
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}
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return ret;
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}
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static int __devexit mc13783_rtc_remove(struct platform_device *pdev)
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{
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struct mc13783_rtc *priv = platform_get_drvdata(pdev);
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rtc_device_unregister(priv->rtc);
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mc13783_lock(priv->mc13783);
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mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
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mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);
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mc13783_unlock(priv->mc13783);
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platform_set_drvdata(pdev, NULL);
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kfree(priv);
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return 0;
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}
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static struct platform_driver mc13783_rtc_driver = {
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.remove = __devexit_p(mc13783_rtc_remove),
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init mc13783_rtc_init(void)
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{
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return platform_driver_probe(&mc13783_rtc_driver, &mc13783_rtc_probe);
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}
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module_init(mc13783_rtc_init);
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static void __exit mc13783_rtc_exit(void)
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{
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platform_driver_unregister(&mc13783_rtc_driver);
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}
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module_exit(mc13783_rtc_exit);
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MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
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MODULE_DESCRIPTION("RTC driver for Freescale MC13783 PMIC");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" DRIVER_NAME);
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