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>

1 files changed, 262 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-mc13783.c b/drivers/rtc/rtc-mc13783.c
new file mode 100644
index 000000000000..850f983c039c
--- /dev/null
+++ b/drivers/rtc/rtc-mc13783.c
@@ -0,0 +1,262 @@
+/*
+ * Real Time Clock driver for Freescale MC13783 PMIC
+ *
+ * (C) 2009 Sascha Hauer, Pengutronix
+ * (C) 2009 Uwe Kleine-Koenig, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/mfd/mc13783.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/rtc.h>
+
+#define DRIVER_NAME "mc13783-rtc"
+
+#define MC13783_RTCTOD  20
+#define MC13783_RTCTODA 21
+#define MC13783_RTCDAY  22
+#define MC13783_RTCDAYA 23
+
+struct mc13783_rtc {
+        struct rtc_device *rtc;
+        struct mc13783 *mc13783;
+        int valid;
+};
+
+static int mc13783_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+        struct mc13783_rtc *priv = dev_get_drvdata(dev);
+        unsigned int seconds, days1, days2;
+        unsigned long s1970;
+        int ret;
+
+        mc13783_lock(priv->mc13783);
+
+        if (!priv->valid) {
+                ret = -ENODATA;
+                goto out;
+        }
+
+        ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days1);
+        if (unlikely(ret))
+                goto out;
+
+        ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTOD, &seconds);
+        if (unlikely(ret))
+                goto out;
+
+        ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days2);
+out:
+        mc13783_unlock(priv->mc13783);
+
+        if (ret)
+                return ret;
+
+        if (days2 == days1 + 1) {
+                if (seconds >= 86400 / 2)
+                        days2 = days1;
+                else
+                        days1 = days2;
+        }
+
+        if (days1 != days2)
+                return -EIO;
+
+        s1970 = days1 * 86400 + seconds;
+
+        rtc_time_to_tm(s1970, tm);
+
+        return rtc_valid_tm(tm);
+}
+
+static int mc13783_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+        struct mc13783_rtc *priv = dev_get_drvdata(dev);
+        unsigned int seconds, days;
+        int ret;
+
+        seconds = secs % 86400;
+        days = secs / 86400;
+
+        mc13783_lock(priv->mc13783);
+
+        /*
+         * first write seconds=0 to prevent a day switch between writing days
+         * and seconds below
+         */
+        ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTOD, 0);
+        if (unlikely(ret))
+                goto out;
+
+        ret = mc13783_reg_write(priv->mc13783, MC13783_RTCDAY, days);
+        if (unlikely(ret))
+                goto out;
+
+        ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTOD, seconds);
+        if (unlikely(ret))
+                goto out;
+
+        ret = mc13783_ackirq(priv->mc13783, MC13783_IRQ_RTCRST);
+        if (unlikely(ret))
+                goto out;
+
+        ret = mc13783_unmask(priv->mc13783, MC13783_IRQ_RTCRST);
+out:
+        priv->valid = !ret;
+
+        mc13783_unlock(priv->mc13783);
+
+        return ret;
+}
+
+static irqreturn_t mc13783_rtc_update_handler(int irq, void *dev)
+{
+        struct mc13783_rtc *priv = dev;
+        struct mc13783 *mc13783 = priv->mc13783;
+
+        dev_dbg(&priv->rtc->dev, "1HZ\n");
+
+        rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);
+
+        mc13783_ackirq(mc13783, irq);
+
+        return IRQ_HANDLED;
+}
+
+static int mc13783_rtc_update_irq_enable(struct device *dev,
+                unsigned int enabled)
+{
+        struct mc13783_rtc *priv = dev_get_drvdata(dev);
+        int ret = -ENODATA;
+
+        mc13783_lock(priv->mc13783);
+        if (!priv->valid)
+                goto out;
+
+        ret = (enabled ? mc13783_unmask : mc13783_mask)(priv->mc13783,
+                        MC13783_IRQ_1HZ);
+out:
+        mc13783_unlock(priv->mc13783);
+
+        return ret;
+}
+
+static const struct rtc_class_ops mc13783_rtc_ops = {
+        .read_time = mc13783_rtc_read_time,
+        .set_mmss = mc13783_rtc_set_mmss,
+        .update_irq_enable = mc13783_rtc_update_irq_enable,
+};
+
+static irqreturn_t mc13783_rtc_reset_handler(int irq, void *dev)
+{
+        struct mc13783_rtc *priv = dev;
+        struct mc13783 *mc13783 = priv->mc13783;
+
+        dev_dbg(&priv->rtc->dev, "RTCRST\n");
+        priv->valid = 0;
+
+        mc13783_mask(mc13783, irq);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct mc13783_rtc *priv;
+
+        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
+        platform_set_drvdata(pdev, priv);
+
+        priv->valid = 1;
+
+        mc13783_lock(priv->mc13783);
+
+        ret = mc13783_irq_request(priv->mc13783, MC13783_IRQ_RTCRST,
+                        mc13783_rtc_reset_handler, DRIVER_NAME, priv);
+        if (ret)
+                goto err_reset_irq_request;
+
+        ret = mc13783_irq_request_nounmask(priv->mc13783, MC13783_IRQ_1HZ,
+                        mc13783_rtc_update_handler, DRIVER_NAME, priv);
+        if (ret)
+                goto err_update_irq_request;
+
+        mc13783_unlock(priv->mc13783);
+
+        priv->rtc = rtc_device_register(pdev->name,
+                        &pdev->dev, &mc13783_rtc_ops, THIS_MODULE);
+
+        if (IS_ERR(priv->rtc)) {
+                ret = PTR_ERR(priv->rtc);
+
+                mc13783_lock(priv->mc13783);
+
+                mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
+err_update_irq_request:
+
+                mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);
+err_reset_irq_request:
+
+                mc13783_unlock(priv->mc13783);
+
+                platform_set_drvdata(pdev, NULL);
+                kfree(priv);
+        }
+
+        return ret;
+}
+
+static int __devexit mc13783_rtc_remove(struct platform_device *pdev)
+{
+        struct mc13783_rtc *priv = platform_get_drvdata(pdev);
+
+        rtc_device_unregister(priv->rtc);
+
+        mc13783_lock(priv->mc13783);
+
+        mc13783_irq_free(priv->mc13783, MC13783_IRQ_1HZ, priv);
+        mc13783_irq_free(priv->mc13783, MC13783_IRQ_RTCRST, priv);
+
+        mc13783_unlock(priv->mc13783);
+
+        platform_set_drvdata(pdev, NULL);
+
+        kfree(priv);
+
+        return 0;
+}
+
+static struct platform_driver mc13783_rtc_driver = {
+        .remove = __devexit_p(mc13783_rtc_remove),
+        .driver = {
+                .name = DRIVER_NAME,
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init mc13783_rtc_init(void)
+{
+        return platform_driver_probe(&mc13783_rtc_driver, &mc13783_rtc_probe);
+}
+module_init(mc13783_rtc_init);
+
+static void __exit mc13783_rtc_exit(void)
+{
+        platform_driver_unregister(&mc13783_rtc_driver);
+}
+module_exit(mc13783_rtc_exit);
+
+MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
+MODULE_DESCRIPTION("RTC driver for Freescale MC13783 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);