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/*
* Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pmic_status.h>
#include <linux/pmic_external.h>
#define RTC_TIME_LSH 0
#define RTC_DAY_LSH 0
#define RTCALARM_TIME_LSH 0
#define RTCALARM_DAY_LSH 0
#define RTC_TIME_WID 17
#define RTC_DAY_WID 15
#define RTCALARM_TIME_WID 17
#define RTCALARM_DAY_WID 15
static unsigned long rtc_status;
static int mxc_rtc_open(struct device *dev)
{
if (test_and_set_bit(1, &rtc_status))
return -EBUSY;
return 0;
}
static void mxc_rtc_release(struct device *dev)
{
clear_bit(1, &rtc_status);
}
static int mxc_rtc_ioctl(struct device *dev, unsigned int cmd,
unsigned long arg)
{
switch (cmd) {
case RTC_AIE_OFF:
pr_debug("alarm off\n");
CHECK_ERROR(pmic_write_reg(REG_RTC_ALARM, 0x100000, 0x100000));
return 0;
case RTC_AIE_ON:
pr_debug("alarm on\n");
CHECK_ERROR(pmic_write_reg(REG_RTC_ALARM, 0, 0x100000));
return 0;
}
return -ENOIOCTLCMD;
}
static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
unsigned int tod_reg_val = 0;
unsigned int day_reg_val = 0, day_reg_val2;
unsigned int mask, value;
unsigned long time;
do {
mask = BITFMASK(RTC_DAY);
CHECK_ERROR(pmic_read_reg(REG_RTC_DAY, &value, mask));
day_reg_val = BITFEXT(value, RTC_DAY);
mask = BITFMASK(RTC_TIME);
CHECK_ERROR(pmic_read_reg(REG_RTC_TIME, &value, mask));
tod_reg_val = BITFEXT(value, RTC_TIME);
mask = BITFMASK(RTC_DAY);
CHECK_ERROR(pmic_read_reg(REG_RTC_DAY, &value, mask));
day_reg_val2 = BITFEXT(value, RTC_DAY);
} while (day_reg_val != day_reg_val2);
time = (unsigned long)((unsigned long)(tod_reg_val &
0x0001FFFF) +
(unsigned long)(day_reg_val * 86400));
rtc_time_to_tm(time, tm);
return 0;
}
static int mxc_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
unsigned int tod_reg_val = 0;
unsigned int day_reg_val, day_reg_val2 = 0;
unsigned int mask, value;
unsigned long time;
if (rtc_valid_tm(tm))
return -1;
rtc_tm_to_time(tm, &time);
tod_reg_val = time % 86400;
day_reg_val = time / 86400;
do {
mask = BITFMASK(RTC_DAY);
value = BITFVAL(RTC_DAY, day_reg_val);
CHECK_ERROR(pmic_write_reg(REG_RTC_DAY, value, mask));
mask = BITFMASK(RTC_TIME);
value = BITFVAL(RTC_TIME, tod_reg_val);
CHECK_ERROR(pmic_write_reg(REG_RTC_TIME, value, mask));
mask = BITFMASK(RTC_DAY);
CHECK_ERROR(pmic_read_reg(REG_RTC_DAY, &value, mask));
day_reg_val2 = BITFEXT(value, RTC_DAY);
} while (day_reg_val != day_reg_val2);
return 0;
}
static int mxc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
unsigned int tod_reg_val = 0;
unsigned int day_reg_val = 0;
unsigned int mask, value;
unsigned long time;
mask = BITFMASK(RTCALARM_TIME);
CHECK_ERROR(pmic_read_reg(REG_RTC_ALARM, &value, mask));
tod_reg_val = BITFEXT(value, RTCALARM_TIME);
mask = BITFMASK(RTCALARM_DAY);
CHECK_ERROR(pmic_read_reg(REG_RTC_DAY_ALARM, &value, mask));
day_reg_val = BITFEXT(value, RTCALARM_DAY);
time = (unsigned long)((unsigned long)(tod_reg_val &
0x0001FFFF) +
(unsigned long)(day_reg_val * 86400));
rtc_time_to_tm(time, &(alrm->time));
return 0;
}
static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
unsigned int tod_reg_val = 0;
unsigned int day_reg_val = 0;
unsigned int mask, value;
unsigned long time;
if (rtc_valid_tm(&alrm->time))
return -1;
rtc_tm_to_time(&alrm->time, &time);
tod_reg_val = time % 86400;
day_reg_val = time / 86400;
mask = BITFMASK(RTCALARM_TIME);
value = BITFVAL(RTCALARM_TIME, tod_reg_val);
CHECK_ERROR(pmic_write_reg(REG_RTC_ALARM, value, mask));
mask = BITFMASK(RTCALARM_DAY);
value = BITFVAL(RTCALARM_DAY, day_reg_val);
CHECK_ERROR(pmic_write_reg(REG_RTC_DAY_ALARM, value, mask));
return 0;
}
struct rtc_drv_data {
struct rtc_device *rtc;
pmic_event_callback_t event;
};
static struct rtc_class_ops mxc_rtc_ops = {
.open = mxc_rtc_open,
.release = mxc_rtc_release,
.ioctl = mxc_rtc_ioctl,
.read_time = mxc_rtc_read_time,
.set_time = mxc_rtc_set_time,
.read_alarm = mxc_rtc_read_alarm,
.set_alarm = mxc_rtc_set_alarm,
};
static void mxc_rtc_alarm_int(void *data)
{
struct rtc_drv_data *pdata = data;
rtc_update_irq(pdata->rtc, 1, RTC_AF | RTC_IRQF);
}
static int mxc_rtc_probe(struct platform_device *pdev)
{
struct rtc_drv_data *pdata = NULL;
printk(KERN_INFO "mc13892 rtc probe start\n");
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->event.func = mxc_rtc_alarm_int;
pdata->event.param = pdata;
CHECK_ERROR(pmic_event_subscribe(EVENT_TODAI, pdata->event));
device_init_wakeup(&pdev->dev, 1);
pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
&mxc_rtc_ops, THIS_MODULE);
platform_set_drvdata(pdev, pdata);
if (IS_ERR(pdata->rtc))
return -1;
printk(KERN_INFO "mc13892 rtc probe succeed\n");
return 0;
}
static int __exit mxc_rtc_remove(struct platform_device *pdev)
{
struct rtc_drv_data *pdata = platform_get_drvdata(pdev);
rtc_device_unregister(pdata->rtc);
CHECK_ERROR(pmic_event_unsubscribe(EVENT_TODAI, pdata->event));
return 0;
}
static struct platform_driver mxc_rtc_driver = {
.driver = {
.name = "pmic_rtc",
},
.probe = mxc_rtc_probe,
.remove = __exit_p(mxc_rtc_remove),
};
static int __init mxc_rtc_init(void)
{
return platform_driver_register(&mxc_rtc_driver);
}
static void __exit mxc_rtc_exit(void)
{
platform_driver_unregister(&mxc_rtc_driver);
}
module_init(mxc_rtc_init);
module_exit(mxc_rtc_exit);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("MC13892 Realtime Clock Driver (RTC)");
MODULE_LICENSE("GPL");
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