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rtc: da9063: RTC driver

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Add the RTC driver for DA9063.

[akpm@linux-foundation.org: coding-style tweaks]
Signed-off-by: Opensource [Steve Twiss] <stwiss.opensource@diasemi.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Mark Brown <broonie@linaro.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: David Dajun Chen <david.chen@diasemi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Opensource [Steve Twiss] 2014-06-06 14:36:03 -07:00 committed by Linus Torvalds
parent 1fcbe42c1b
commit c2a57550fe
3 changed files with 344 additions and 0 deletions
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10
drivers/rtc/Kconfig
View File

@ -777,6 +777,16 @@ config RTC_DRV_DA9055
This driver can also be built as a module. If so, the module
will be called rtc-da9055
config RTC_DRV_DA9063
tristate "Dialog Semiconductor DA9063 RTC"
depends on MFD_DA9063
help
If you say yes here you will get support for the RTC subsystem
of the Dialog Semiconductor DA9063.
This driver can also be built as a module. If so, the module
will be called "rtc-da9063".
config RTC_DRV_EFI
tristate "EFI RTC"
depends on IA64

1
drivers/rtc/Makefile
View File

@ -32,6 +32,7 @@ obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o
obj-$(CONFIG_RTC_DRV_DA9052) += rtc-da9052.o
obj-$(CONFIG_RTC_DRV_DA9055) += rtc-da9055.o
obj-$(CONFIG_RTC_DRV_DA9063) += rtc-da9063.o
obj-$(CONFIG_RTC_DRV_DAVINCI) += rtc-davinci.o
obj-$(CONFIG_RTC_DRV_DM355EVM) += rtc-dm355evm.o
obj-$(CONFIG_RTC_DRV_VRTC) += rtc-mrst.o

333
drivers/rtc/rtc-da9063.c Normal file
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@ -0,0 +1,333 @@
/* rtc-da9063.c - Real time clock device driver for DA9063
* Copyright (C) 2013-14 Dialog Semiconductor Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h>
#define YEARS_TO_DA9063(year) ((year) - 100)
#define MONTHS_TO_DA9063(month) ((month) + 1)
#define YEARS_FROM_DA9063(year) ((year) + 100)
#define MONTHS_FROM_DA9063(month) ((month) - 1)
#define RTC_DATA_LEN (DA9063_REG_COUNT_Y - DA9063_REG_COUNT_S + 1)
#define RTC_SEC 0
#define RTC_MIN 1
#define RTC_HOUR 2
#define RTC_DAY 3
#define RTC_MONTH 4
#define RTC_YEAR 5
struct da9063_rtc {
struct rtc_device *rtc_dev;
struct da9063 *hw;
struct rtc_time alarm_time;
bool rtc_sync;
};
static void da9063_data_to_tm(u8 *data, struct rtc_time *tm)
{
tm->tm_sec = data[RTC_SEC] & DA9063_COUNT_SEC_MASK;
tm->tm_min = data[RTC_MIN] & DA9063_COUNT_MIN_MASK;
tm->tm_hour = data[RTC_HOUR] & DA9063_COUNT_HOUR_MASK;
tm->tm_mday = data[RTC_DAY] & DA9063_COUNT_DAY_MASK;
tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] &
DA9063_COUNT_MONTH_MASK);
tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
DA9063_COUNT_YEAR_MASK);
}
static void da9063_tm_to_data(struct rtc_time *tm, u8 *data)
{
data[RTC_SEC] &= ~DA9063_COUNT_SEC_MASK;
data[RTC_SEC] |= tm->tm_sec & DA9063_COUNT_SEC_MASK;
data[RTC_MIN] &= ~DA9063_COUNT_MIN_MASK;
data[RTC_MIN] |= tm->tm_min & DA9063_COUNT_MIN_MASK;
data[RTC_HOUR] &= ~DA9063_COUNT_HOUR_MASK;
data[RTC_HOUR] |= tm->tm_hour & DA9063_COUNT_HOUR_MASK;
data[RTC_DAY] &= ~DA9063_COUNT_DAY_MASK;
data[RTC_DAY] |= tm->tm_mday & DA9063_COUNT_DAY_MASK;
data[RTC_MONTH] &= ~DA9063_COUNT_MONTH_MASK;
data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) &
DA9063_COUNT_MONTH_MASK;
data[RTC_YEAR] &= ~DA9063_COUNT_YEAR_MASK;
data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) &
DA9063_COUNT_YEAR_MASK;
}
static int da9063_rtc_stop_alarm(struct device *dev)
{
struct da9063_rtc *rtc = dev_get_drvdata(dev);
return regmap_update_bits(rtc->hw->regmap, DA9063_REG_ALARM_Y,
DA9063_ALARM_ON, 0);
}
static int da9063_rtc_start_alarm(struct device *dev)
{
struct da9063_rtc *rtc = dev_get_drvdata(dev);
return regmap_update_bits(rtc->hw->regmap, DA9063_REG_ALARM_Y,
DA9063_ALARM_ON, DA9063_ALARM_ON);
}
static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct da9063_rtc *rtc = dev_get_drvdata(dev);
unsigned long tm_secs;
unsigned long al_secs;
u8 data[RTC_DATA_LEN];
int ret;
ret = regmap_bulk_read(rtc->hw->regmap, DA9063_REG_COUNT_S,
data, RTC_DATA_LEN);
if (ret < 0) {
dev_err(dev, "Failed to read RTC time data: %d\n", ret);
return ret;
}
if (!(data[RTC_SEC] & DA9063_RTC_READ)) {
dev_dbg(dev, "RTC not yet ready to be read by the host\n");
return -EINVAL;
}
da9063_data_to_tm(data, tm);
rtc_tm_to_time(tm, &tm_secs);
rtc_tm_to_time(&rtc->alarm_time, &al_secs);
/* handle the rtc synchronisation delay */
if (rtc->rtc_sync == true && al_secs - tm_secs == 1)
memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
else
rtc->rtc_sync = false;
return rtc_valid_tm(tm);
}
static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct da9063_rtc *rtc = dev_get_drvdata(dev);
u8 data[RTC_DATA_LEN];
int ret;
da9063_tm_to_data(tm, data);
ret = regmap_bulk_write(rtc->hw->regmap, DA9063_REG_COUNT_S,
data, RTC_DATA_LEN);
if (ret < 0)
dev_err(dev, "Failed to set RTC time data: %d\n", ret);
return ret;
}
static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct da9063_rtc *rtc = dev_get_drvdata(dev);
u8 data[RTC_DATA_LEN];
int ret;
unsigned int val;
ret = regmap_bulk_read(rtc->hw->regmap, DA9063_REG_ALARM_S,
&data[RTC_SEC], RTC_DATA_LEN);
if (ret < 0)
return ret;
da9063_data_to_tm(data, &alrm->time);
alrm->enabled = !!(data[RTC_YEAR] & DA9063_ALARM_ON);
ret = regmap_read(rtc->hw->regmap, DA9063_REG_EVENT_A, &val);
if (ret < 0)
return ret;
if (val & (DA9063_E_ALARM))
alrm->pending = 1;
else
alrm->pending = 0;
return 0;
}
static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct da9063_rtc *rtc = dev_get_drvdata(dev);
u8 data[RTC_DATA_LEN];
int ret;
da9063_tm_to_data(&alrm->time, data);
ret = da9063_rtc_stop_alarm(dev);
if (ret < 0) {
dev_err(dev, "Failed to stop alarm: %d\n", ret);
return ret;
}
ret = regmap_bulk_write(rtc->hw->regmap, DA9063_REG_ALARM_S,
data, RTC_DATA_LEN);
if (ret < 0) {
dev_err(dev, "Failed to write alarm: %d\n", ret);
return ret;
}
rtc->alarm_time = alrm->time;
if (alrm->enabled) {
ret = da9063_rtc_start_alarm(dev);
if (ret < 0) {
dev_err(dev, "Failed to start alarm: %d\n", ret);
return ret;
}
}
return ret;
}
static int da9063_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
if (enabled)
return da9063_rtc_start_alarm(dev);
else
return da9063_rtc_stop_alarm(dev);
}
static irqreturn_t da9063_alarm_event(int irq, void *data)
{
struct da9063_rtc *rtc = data;
regmap_update_bits(rtc->hw->regmap, DA9063_REG_ALARM_Y,
DA9063_ALARM_ON, 0);
rtc->rtc_sync = true;
rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;
}
static const struct rtc_class_ops da9063_rtc_ops = {
.read_time = da9063_rtc_read_time,
.set_time = da9063_rtc_set_time,
.read_alarm = da9063_rtc_read_alarm,
.set_alarm = da9063_rtc_set_alarm,
.alarm_irq_enable = da9063_rtc_alarm_irq_enable,
};
static int da9063_rtc_probe(struct platform_device *pdev)
{
struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
struct da9063_rtc *rtc;
int irq_alarm;
u8 data[RTC_DATA_LEN];
int ret;
ret = regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_E,
DA9063_RTC_EN, DA9063_RTC_EN);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to enable RTC\n");
goto err;
}
ret = regmap_update_bits(da9063->regmap, DA9063_REG_EN_32K,
DA9063_CRYSTAL, DA9063_CRYSTAL);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
goto err;
}
ret = regmap_update_bits(da9063->regmap, DA9063_REG_ALARM_S,
DA9063_ALARM_STATUS_TICK | DA9063_ALARM_STATUS_ALARM,
0);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
goto err;
}
ret = regmap_update_bits(da9063->regmap, DA9063_REG_ALARM_S,
DA9063_ALARM_STATUS_ALARM,
DA9063_ALARM_STATUS_ALARM);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
goto err;
}
ret = regmap_update_bits(da9063->regmap, DA9063_REG_ALARM_Y,
DA9063_TICK_ON, 0);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to disable TICKs\n");
goto err;
}
ret = regmap_bulk_read(da9063->regmap, DA9063_REG_ALARM_S,
data, RTC_DATA_LEN);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
ret);
goto err;
}
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (!rtc)
return -ENOMEM;
platform_set_drvdata(pdev, rtc);
irq_alarm = platform_get_irq_byname(pdev, "ALARM");
ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
da9063_alarm_event,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"ALARM", rtc);
if (ret) {
dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
irq_alarm, ret);
goto err;
}
rtc->hw = da9063;
rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC,
&da9063_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc->rtc_dev))
return PTR_ERR(rtc->rtc_dev);
da9063_data_to_tm(data, &rtc->alarm_time);
rtc->rtc_sync = false;
err:
return ret;
}
static struct platform_driver da9063_rtc_driver = {
.probe = da9063_rtc_probe,
.driver = {
.name = DA9063_DRVNAME_RTC,
.owner = THIS_MODULE,
},
};
module_platform_driver(da9063_rtc_driver);
MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);