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|
/*
* RTC Driver for Freescale MC34708 PMIC
*
* Copyright (C) 2004-2011 Freescale Semiconductor, Inc.
*
* Based on mc13xxx rtc driver :
* Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
* Copyright 2009 Pengutronix, Uwe Kleine-Koenig
* <u.kleine-koenig@pengutronix.de>
*
* 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/platform_device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/mfd/mc-pmic.h>
#define DRIVER_NAME "mc34708-rtc"
#define MC34708_RTCTOD 20
#define MC34708_RTCTODA 21
#define MC34708_RTCDAY 22
#define MC34708_RTCDAYA 23
struct mc34708_rtc {
struct rtc_device *rtc;
struct mc_pmic *mc_pmic;
int valid;
int hz_alarm; /*workaround the 1hz_alarm loss interrupt */
};
static int
mc34708_rtc_irq_enable_unlocked(struct device *dev,
unsigned int enabled, int irq)
{
struct mc34708_rtc *priv = dev_get_drvdata(dev);
int (*func) (struct mc_pmic *mc_pmic, int irq);
if (!priv->valid)
return -ENODATA;
func = enabled ? mc_pmic_irq_unmask : mc_pmic_irq_mask;
return func(priv->mc_pmic, irq);
}
static int
mc34708_rtc_irq_enable(struct device *dev, unsigned int enabled, int irq)
{
struct mc34708_rtc *priv = dev_get_drvdata(dev);
int ret;
mc_pmic_lock(priv->mc_pmic);
ret = mc34708_rtc_irq_enable_unlocked(dev, enabled, irq);
mc_pmic_unlock(priv->mc_pmic);
return ret;
}
static int mc34708_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct mc34708_rtc *priv = dev_get_drvdata(dev);
unsigned int seconds, days1, days2;
unsigned long s1970;
int ret;
mc_pmic_lock(priv->mc_pmic);
if (!priv->valid) {
ret = -ENODATA;
goto out;
}
ret = mc_pmic_reg_read(priv->mc_pmic, MC34708_RTCDAY, &days1);
if (unlikely(ret))
goto out;
ret = mc_pmic_reg_read(priv->mc_pmic, MC34708_RTCTOD, &seconds);
if (unlikely(ret))
goto out;
ret = mc_pmic_reg_read(priv->mc_pmic, MC34708_RTCDAY, &days2);
out:
mc_pmic_unlock(priv->mc_pmic);
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 mc34708_rtc_set_mmss(struct device *dev, unsigned long secs)
{
struct mc34708_rtc *priv = dev_get_drvdata(dev);
unsigned int seconds, days;
unsigned int alarmseconds;
int ret;
seconds = secs % 86400;
days = secs / 86400;
mc_pmic_lock(priv->mc_pmic);
/*
* temporarily invalidate alarm to prevent triggering it when the day is
* already updated while the time isn't yet.
*/
ret = mc_pmic_reg_read(priv->mc_pmic, MC34708_RTCTODA, &alarmseconds);
if (unlikely(ret))
goto out;
if (alarmseconds < 86400) {
ret =
mc_pmic_reg_write(priv->mc_pmic, MC34708_RTCTODA, 0x1ffff);
if (unlikely(ret))
goto out;
}
/*
* write seconds=0 to prevent a day switch between writing days
* and seconds below
*/
ret = mc_pmic_reg_write(priv->mc_pmic, MC34708_RTCTOD, 0);
if (unlikely(ret))
goto out;
ret = mc_pmic_reg_write(priv->mc_pmic, MC34708_RTCDAY, days);
if (unlikely(ret))
goto out;
ret = mc_pmic_reg_write(priv->mc_pmic, MC34708_RTCTOD, seconds);
if (unlikely(ret))
goto out;
/* restore alarm */
if (alarmseconds < 86400) {
ret =
mc_pmic_reg_write(priv->mc_pmic, MC34708_RTCTODA,
alarmseconds);
if (unlikely(ret))
goto out;
}
ret = mc_pmic_irq_ack(priv->mc_pmic, MC_PMIC_IRQ_RTCRST);
if (unlikely(ret))
goto out;
ret = mc_pmic_irq_unmask(priv->mc_pmic, MC_PMIC_IRQ_RTCRST);
out:
priv->valid = !ret;
mc_pmic_unlock(priv->mc_pmic);
return ret;
}
static int mc34708_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct mc34708_rtc *priv = dev_get_drvdata(dev);
unsigned seconds, days;
unsigned long s1970;
int enabled, pending;
int ret;
mc_pmic_lock(priv->mc_pmic);
ret = mc_pmic_reg_read(priv->mc_pmic, MC34708_RTCTODA, &seconds);
if (unlikely(ret))
goto out;
if (seconds >= 86400) {
ret = -ENODATA;
goto out;
}
ret = mc_pmic_reg_read(priv->mc_pmic, MC34708_RTCDAY, &days);
if (unlikely(ret))
goto out;
ret = mc_pmic_irq_status(priv->mc_pmic, MC_PMIC_IRQ_TODA,
&enabled, &pending);
out:
mc_pmic_unlock(priv->mc_pmic);
if (ret)
return ret;
alarm->enabled = enabled;
alarm->pending = pending;
s1970 = days * 86400 + seconds;
rtc_time_to_tm(s1970, &alarm->time);
dev_dbg(dev, "%s: %lu\n", __func__, s1970);
return 0;
}
static int mc34708_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct mc34708_rtc *priv = dev_get_drvdata(dev);
unsigned long s1970;
unsigned seconds, days, seconds_now, days_now;
int ret;
mc_pmic_lock(priv->mc_pmic);
/* disable alarm to prevent false triggering */
ret = mc_pmic_reg_write(priv->mc_pmic, MC34708_RTCTODA, 0x1ffff);
if (unlikely(ret))
goto out;
ret = mc_pmic_irq_ack(priv->mc_pmic, MC_PMIC_IRQ_TODA);
if (unlikely(ret))
goto out;
ret = rtc_tm_to_time(&alarm->time, &s1970);
if (unlikely(ret))
goto out;
dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff",
s1970);
ret = mc34708_rtc_irq_enable_unlocked(dev, alarm->enabled,
MC_PMIC_IRQ_TODA);
if (unlikely(ret))
goto out;
seconds = s1970 % 86400;
days = s1970 / 86400;
ret = mc_pmic_reg_read(priv->mc_pmic, MC34708_RTCDAY, &days_now);
if (unlikely(ret))
goto out;
ret = mc_pmic_reg_read(priv->mc_pmic, MC34708_RTCTOD, &seconds_now);
if (unlikely(ret))
goto out;
if ((days_now == days) && (seconds == seconds_now + 1)) {
priv->hz_alarm = 1;
/*enable 1hz */
mc34708_rtc_irq_enable_unlocked(dev, 1, MC_PMIC_IRQ_1HZ);
dev_dbg(dev, "1HZ_ALARM enabled!\n");
goto out;
}
ret = mc_pmic_reg_write(priv->mc_pmic, MC34708_RTCDAYA, days);
if (unlikely(ret))
goto out;
ret = mc_pmic_reg_write(priv->mc_pmic, MC34708_RTCTODA, seconds);
out:
mc_pmic_unlock(priv->mc_pmic);
return ret;
}
static irqreturn_t mc34708_rtc_alarm_handler(int irq, void *dev)
{
struct mc34708_rtc *priv = dev;
struct mc_pmic *mc_pmic = priv->mc_pmic;
dev_dbg(&priv->rtc->dev, "Alarm\n");
rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);
mc_pmic_irq_ack(mc_pmic, irq);
return IRQ_HANDLED;
}
static irqreturn_t mc34708_rtc_update_handler(int irq, void *dev)
{
struct mc34708_rtc *priv = dev;
struct mc_pmic *mc_pmic = priv->mc_pmic;
if (priv->hz_alarm == 1) { /*replace alarm irq with 1hz irq */
rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);
priv->hz_alarm = 0;
mc_pmic_irq_ack(mc_pmic, irq);
mc_pmic_irq_mask(mc_pmic, irq); /*disable 1Hz */
dev_dbg(&priv->rtc->dev, "1HZ_ALARM!\n");
} else {
dev_dbg(&priv->rtc->dev, "1HZ\n");
rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF);
mc_pmic_irq_ack(mc_pmic, irq);
}
return IRQ_HANDLED;
}
static int
mc34708_rtc_update_irq_enable(struct device *dev, unsigned int enabled)
{
return mc34708_rtc_irq_enable(dev, enabled, MC_PMIC_IRQ_1HZ);
}
static int
mc34708_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
return mc34708_rtc_irq_enable(dev, enabled, MC_PMIC_IRQ_TODA);
}
static const struct rtc_class_ops mc34708_rtc_ops = {
.read_time = mc34708_rtc_read_time,
.set_mmss = mc34708_rtc_set_mmss,
.read_alarm = mc34708_rtc_read_alarm,
.set_alarm = mc34708_rtc_set_alarm,
.alarm_irq_enable = mc34708_rtc_alarm_irq_enable,
.update_irq_enable = mc34708_rtc_update_irq_enable,
};
static irqreturn_t mc34708_rtc_reset_handler(int irq, void *dev)
{
struct mc34708_rtc *priv = dev;
struct mc_pmic *mc_pmic = priv->mc_pmic;
dev_dbg(&priv->rtc->dev, "RTCRST\n");
priv->valid = 0;
mc_pmic_irq_mask(mc_pmic, irq);
return IRQ_HANDLED;
}
static int __devinit mc34708_rtc_probe(struct platform_device *pdev)
{
int ret;
struct mc34708_rtc *priv;
struct mc_pmic *mc_pmic;
int rtcrst_pending;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
mc_pmic = dev_get_drvdata(pdev->dev.parent);
priv->mc_pmic = mc_pmic;
platform_set_drvdata(pdev, priv);
mc_pmic_lock(mc_pmic);
ret = mc_pmic_irq_request_nounmask(mc_pmic, MC_PMIC_IRQ_RTCRST,
mc34708_rtc_reset_handler,
DRIVER_NAME, priv);
if (ret)
goto err_reset_irq_request;
ret = mc_pmic_irq_status(mc_pmic, MC_PMIC_IRQ_RTCRST,
NULL, &rtcrst_pending);
if (ret)
goto err_reset_irq_status;
priv->valid = rtcrst_pending;
if (priv->valid) {
/*if reset interrupt status have pending clear it */
ret = mc_pmic_irq_ack(priv->mc_pmic, MC_PMIC_IRQ_RTCRST);
if (ret)
goto err_reset_irq_status;
} else
priv->valid = 1;
mc34708_rtc_irq_enable_unlocked(&pdev->dev, 1, MC_PMIC_IRQ_RTCRST);
priv->hz_alarm = 0;
ret = mc_pmic_irq_request_nounmask(mc_pmic, MC_PMIC_IRQ_1HZ,
mc34708_rtc_update_handler,
DRIVER_NAME, priv);
if (ret)
goto err_update_irq_request;
ret = mc_pmic_irq_request_nounmask(mc_pmic, MC_PMIC_IRQ_TODA,
mc34708_rtc_alarm_handler,
DRIVER_NAME, priv);
if (ret)
goto err_alarm_irq_request;
priv->rtc = rtc_device_register(pdev->name,
&pdev->dev, &mc34708_rtc_ops,
THIS_MODULE);
if (IS_ERR(priv->rtc)) {
ret = PTR_ERR(priv->rtc);
mc_pmic_irq_free(mc_pmic, MC_PMIC_IRQ_TODA, priv);
err_alarm_irq_request:
mc_pmic_irq_free(mc_pmic, MC_PMIC_IRQ_1HZ, priv);
err_update_irq_request:
err_reset_irq_status:
mc_pmic_irq_free(mc_pmic, MC_PMIC_IRQ_RTCRST, priv);
err_reset_irq_request:
platform_set_drvdata(pdev, NULL);
kfree(priv);
}
mc_pmic_unlock(mc_pmic);
return ret;
}
static int __devexit mc34708_rtc_remove(struct platform_device *pdev)
{
struct mc34708_rtc *priv = platform_get_drvdata(pdev);
mc_pmic_lock(priv->mc_pmic);
rtc_device_unregister(priv->rtc);
mc_pmic_irq_free(priv->mc_pmic, MC_PMIC_IRQ_TODA, priv);
mc_pmic_irq_free(priv->mc_pmic, MC_PMIC_IRQ_1HZ, priv);
mc_pmic_irq_free(priv->mc_pmic, MC_PMIC_IRQ_RTCRST, priv);
mc_pmic_unlock(priv->mc_pmic);
platform_set_drvdata(pdev, NULL);
kfree(priv);
return 0;
}
const struct platform_device_id mc34708_rtc_idtable[] = {
{
.name = "mc34708-rtc",
},
};
static struct platform_driver mc34708_rtc_driver = {
.id_table = mc34708_rtc_idtable,
.remove = __devexit_p(mc34708_rtc_remove),
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
};
static int __init mc34708_rtc_init(void)
{
return platform_driver_probe(&mc34708_rtc_driver, &mc34708_rtc_probe);
}
module_init(mc34708_rtc_init);
static void __exit mc34708_rtc_exit(void)
{
platform_driver_unregister(&mc34708_rtc_driver);
}
module_exit(mc34708_rtc_exit);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("RTC driver for Freescale MC34708 PMIC");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
|