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alistair23-linux/drivers/rtc/rtc-da9063.c
Opensource [Steve Twiss] 9cb42e2a8e mfd: da9063: Add support for AD silicon variant 
Add register definitions for DA9063 AD (0x3) silicon variant ID
the ability to choose the silicon variant at run-time using regmap
configuration. This patch also adds RTC support for the AD silicon
changes.

It adds both BB and AD support as regmap ranges and then makes the
distinction between the two tables at run-time. This allows both AD
and BB silicon variants to be supported at the same time.

Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Opensource [Steve Twiss] <stwiss.opensource@diasemi.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2014-07-28 08:09:25 +01:00

354 lines
9.1 KiB
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/* 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_ALARM_DATA_LEN (DA9063_AD_REG_ALARM_Y - DA9063_AD_REG_ALARM_MI + 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;
int alarm_year;
int alarm_start;
int alarm_len;
int data_start;
};
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, rtc->alarm_year,
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, rtc->alarm_year,
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;
data[RTC_SEC] = 0;
ret = regmap_bulk_read(rtc->hw->regmap, rtc->alarm_start,
&data[rtc->data_start], rtc->alarm_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, rtc->alarm_start,
&data[rtc->data_start], rtc->alarm_len);
if (ret < 0) {
dev_err(dev, "Failed to write alarm: %d\n", ret);
return ret;
}
da9063_data_to_tm(data, &rtc->alarm_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, rtc->alarm_year,
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;
}
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (!rtc)
return -ENOMEM;
if (da9063->variant_code == PMIC_DA9063_AD) {
rtc->alarm_year = DA9063_AD_REG_ALARM_Y;
rtc->alarm_start = DA9063_AD_REG_ALARM_MI;
rtc->alarm_len = RTC_ALARM_DATA_LEN;
rtc->data_start = RTC_MIN;
} else {
rtc->alarm_year = DA9063_BB_REG_ALARM_Y;
rtc->alarm_start = DA9063_BB_REG_ALARM_S;
rtc->alarm_len = RTC_DATA_LEN;
rtc->data_start = RTC_SEC;
}
ret = regmap_update_bits(da9063->regmap, rtc->alarm_start,
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, rtc->alarm_start,
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, rtc->alarm_year,
DA9063_TICK_ON, 0);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to disable TICKs\n");
goto err;
}
data[RTC_SEC] = 0;
ret = regmap_bulk_read(da9063->regmap, rtc->alarm_start,
&data[rtc->data_start], rtc->alarm_len);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
ret);
goto err;
}
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);
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