429 строки
9.3 KiB
C
429 строки
9.3 KiB
C
/*
|
|
* 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/slab.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_irq_enable_unlocked(struct device *dev,
|
|
unsigned int enabled, int irq)
|
|
{
|
|
struct mc13783_rtc *priv = dev_get_drvdata(dev);
|
|
int (*func)(struct mc13783 *mc13783, int irq);
|
|
|
|
if (!priv->valid)
|
|
return -ENODATA;
|
|
|
|
func = enabled ? mc13783_irq_unmask : mc13783_irq_mask;
|
|
return func(priv->mc13783, irq);
|
|
}
|
|
|
|
static int mc13783_rtc_irq_enable(struct device *dev,
|
|
unsigned int enabled, int irq)
|
|
{
|
|
struct mc13783_rtc *priv = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
mc13783_lock(priv->mc13783);
|
|
|
|
ret = mc13783_rtc_irq_enable_unlocked(dev, enabled, irq);
|
|
|
|
mc13783_unlock(priv->mc13783);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
unsigned int alarmseconds;
|
|
int ret;
|
|
|
|
seconds = secs % 86400;
|
|
days = secs / 86400;
|
|
|
|
mc13783_lock(priv->mc13783);
|
|
|
|
/*
|
|
* temporarily invalidate alarm to prevent triggering it when the day is
|
|
* already updated while the time isn't yet.
|
|
*/
|
|
ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTODA, &alarmseconds);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
if (alarmseconds < 86400) {
|
|
ret = mc13783_reg_write(priv->mc13783,
|
|
MC13783_RTCTODA, 0x1ffff);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/* restore alarm */
|
|
if (alarmseconds < 86400) {
|
|
ret = mc13783_reg_write(priv->mc13783,
|
|
MC13783_RTCTODA, alarmseconds);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
}
|
|
|
|
ret = mc13783_irq_ack(priv->mc13783, MC13783_IRQ_RTCRST);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
ret = mc13783_irq_unmask(priv->mc13783, MC13783_IRQ_RTCRST);
|
|
out:
|
|
priv->valid = !ret;
|
|
|
|
mc13783_unlock(priv->mc13783);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mc13783_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
|
{
|
|
struct mc13783_rtc *priv = dev_get_drvdata(dev);
|
|
unsigned seconds, days;
|
|
unsigned long s1970;
|
|
int enabled, pending;
|
|
int ret;
|
|
|
|
mc13783_lock(priv->mc13783);
|
|
|
|
ret = mc13783_reg_read(priv->mc13783, MC13783_RTCTODA, &seconds);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
if (seconds >= 86400) {
|
|
ret = -ENODATA;
|
|
goto out;
|
|
}
|
|
|
|
ret = mc13783_reg_read(priv->mc13783, MC13783_RTCDAY, &days);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
ret = mc13783_irq_status(priv->mc13783, MC13783_IRQ_TODA,
|
|
&enabled, &pending);
|
|
|
|
out:
|
|
mc13783_unlock(priv->mc13783);
|
|
|
|
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 mc13783_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
|
{
|
|
struct mc13783_rtc *priv = dev_get_drvdata(dev);
|
|
unsigned long s1970;
|
|
unsigned seconds, days;
|
|
int ret;
|
|
|
|
mc13783_lock(priv->mc13783);
|
|
|
|
/* disable alarm to prevent false triggering */
|
|
ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTODA, 0x1ffff);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
ret = mc13783_irq_ack(priv->mc13783, MC13783_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 = mc13783_rtc_irq_enable_unlocked(dev, alarm->enabled,
|
|
MC13783_IRQ_TODA);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
seconds = s1970 % 86400;
|
|
days = s1970 / 86400;
|
|
|
|
ret = mc13783_reg_write(priv->mc13783, MC13783_RTCDAYA, days);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
ret = mc13783_reg_write(priv->mc13783, MC13783_RTCTODA, seconds);
|
|
|
|
out:
|
|
mc13783_unlock(priv->mc13783);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static irqreturn_t mc13783_rtc_alarm_handler(int irq, void *dev)
|
|
{
|
|
struct mc13783_rtc *priv = dev;
|
|
struct mc13783 *mc13783 = priv->mc13783;
|
|
|
|
dev_dbg(&priv->rtc->dev, "Alarm\n");
|
|
|
|
rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);
|
|
|
|
mc13783_irq_ack(mc13783, irq);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
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_irq_ack(mc13783, irq);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int mc13783_rtc_update_irq_enable(struct device *dev,
|
|
unsigned int enabled)
|
|
{
|
|
return mc13783_rtc_irq_enable(dev, enabled, MC13783_IRQ_1HZ);
|
|
}
|
|
|
|
static int mc13783_rtc_alarm_irq_enable(struct device *dev,
|
|
unsigned int enabled)
|
|
{
|
|
return mc13783_rtc_irq_enable(dev, enabled, MC13783_IRQ_TODA);
|
|
}
|
|
|
|
static const struct rtc_class_ops mc13783_rtc_ops = {
|
|
.read_time = mc13783_rtc_read_time,
|
|
.set_mmss = mc13783_rtc_set_mmss,
|
|
.read_alarm = mc13783_rtc_read_alarm,
|
|
.set_alarm = mc13783_rtc_set_alarm,
|
|
.alarm_irq_enable = mc13783_rtc_alarm_irq_enable,
|
|
.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_irq_mask(mc13783, irq);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int __devinit mc13783_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct mc13783_rtc *priv;
|
|
struct mc13783 *mc13783;
|
|
int rtcrst_pending;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
mc13783 = dev_get_drvdata(pdev->dev.parent);
|
|
priv->mc13783 = mc13783;
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
mc13783_lock(mc13783);
|
|
|
|
ret = mc13783_irq_request(mc13783, MC13783_IRQ_RTCRST,
|
|
mc13783_rtc_reset_handler, DRIVER_NAME, priv);
|
|
if (ret)
|
|
goto err_reset_irq_request;
|
|
|
|
ret = mc13783_irq_status(mc13783, MC13783_IRQ_RTCRST,
|
|
NULL, &rtcrst_pending);
|
|
if (ret)
|
|
goto err_reset_irq_status;
|
|
|
|
priv->valid = !rtcrst_pending;
|
|
|
|
ret = mc13783_irq_request_nounmask(mc13783, MC13783_IRQ_1HZ,
|
|
mc13783_rtc_update_handler, DRIVER_NAME, priv);
|
|
if (ret)
|
|
goto err_update_irq_request;
|
|
|
|
ret = mc13783_irq_request_nounmask(mc13783, MC13783_IRQ_TODA,
|
|
mc13783_rtc_alarm_handler, DRIVER_NAME, priv);
|
|
if (ret)
|
|
goto err_alarm_irq_request;
|
|
|
|
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_irq_free(mc13783, MC13783_IRQ_TODA, priv);
|
|
err_alarm_irq_request:
|
|
|
|
mc13783_irq_free(mc13783, MC13783_IRQ_1HZ, priv);
|
|
err_update_irq_request:
|
|
|
|
err_reset_irq_status:
|
|
|
|
mc13783_irq_free(mc13783, MC13783_IRQ_RTCRST, priv);
|
|
err_reset_irq_request:
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
kfree(priv);
|
|
}
|
|
|
|
mc13783_unlock(mc13783);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit mc13783_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct mc13783_rtc *priv = platform_get_drvdata(pdev);
|
|
|
|
mc13783_lock(priv->mc13783);
|
|
|
|
rtc_device_unregister(priv->rtc);
|
|
|
|
mc13783_irq_free(priv->mc13783, MC13783_IRQ_TODA, priv);
|
|
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);
|