443 lines
9.9 KiB
C
443 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* drivers/rtc/rtc-rc5t619.c
|
|
*
|
|
* Real time clock driver for RICOH RC5T619 power management chip.
|
|
*
|
|
* Copyright (C) 2019 Andreas Kemnade
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/device.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mfd/rn5t618.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/bcd.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/irqdomain.h>
|
|
|
|
struct rc5t619_rtc {
|
|
int irq;
|
|
struct rtc_device *rtc;
|
|
struct rn5t618 *rn5t618;
|
|
};
|
|
|
|
#define CTRL1_ALARM_ENABLED 0x40
|
|
#define CTRL1_24HR 0x20
|
|
#define CTRL1_PERIODIC_MASK 0xf
|
|
|
|
#define CTRL2_PON 0x10
|
|
#define CTRL2_ALARM_STATUS 0x80
|
|
#define CTRL2_CTFG 0x4
|
|
#define CTRL2_CTC 0x1
|
|
|
|
#define MONTH_CENTFLAG 0x80
|
|
#define HOUR_PMFLAG 0x20
|
|
#define MDAY_DAL_EXT 0x80
|
|
|
|
static uint8_t rtc5t619_12hour_bcd2bin(uint8_t hour)
|
|
{
|
|
if (hour & HOUR_PMFLAG) {
|
|
hour = bcd2bin(hour & ~HOUR_PMFLAG);
|
|
return hour == 12 ? 12 : 12 + hour;
|
|
}
|
|
|
|
hour = bcd2bin(hour);
|
|
return hour == 12 ? 0 : hour;
|
|
}
|
|
|
|
static uint8_t rtc5t619_12hour_bin2bcd(uint8_t hour)
|
|
{
|
|
if (!hour)
|
|
return 0x12;
|
|
|
|
if (hour < 12)
|
|
return bin2bcd(hour);
|
|
|
|
if (hour == 12)
|
|
return 0x12 | HOUR_PMFLAG;
|
|
|
|
return bin2bcd(hour - 12) | HOUR_PMFLAG;
|
|
}
|
|
|
|
static int rc5t619_rtc_periodic_disable(struct device *dev)
|
|
{
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
int err;
|
|
|
|
/* disable function */
|
|
err = regmap_update_bits(rtc->rn5t618->regmap,
|
|
RN5T618_RTC_CTRL1, CTRL1_PERIODIC_MASK, 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* clear alarm flag and CTFG */
|
|
err = regmap_update_bits(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2,
|
|
CTRL2_ALARM_STATUS | CTRL2_CTFG | CTRL2_CTC,
|
|
0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* things to be done once after power on */
|
|
static int rc5t619_rtc_pon_setup(struct device *dev)
|
|
{
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
int err;
|
|
unsigned int reg_data;
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, ®_data);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* clear VDET PON */
|
|
reg_data &= ~(CTRL2_PON | CTRL2_CTC | 0x4a); /* 0101-1011 */
|
|
reg_data |= 0x20; /* 0010-0000 */
|
|
err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, reg_data);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* clearing RTC Adjust register */
|
|
err = regmap_write(rtc->rn5t618->regmap, RN5T618_RTC_ADJUST, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
return regmap_update_bits(rtc->rn5t618->regmap,
|
|
RN5T618_RTC_CTRL1,
|
|
CTRL1_24HR, CTRL1_24HR);
|
|
}
|
|
|
|
static int rc5t619_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
u8 buff[7];
|
|
int err;
|
|
int cent_flag;
|
|
unsigned int ctrl1;
|
|
unsigned int ctrl2;
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (ctrl2 & CTRL2_PON)
|
|
return -EINVAL;
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
|
|
buff, sizeof(buff));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (buff[5] & MONTH_CENTFLAG)
|
|
cent_flag = 1;
|
|
else
|
|
cent_flag = 0;
|
|
|
|
tm->tm_sec = bcd2bin(buff[0]);
|
|
tm->tm_min = bcd2bin(buff[1]);
|
|
|
|
if (ctrl1 & CTRL1_24HR)
|
|
tm->tm_hour = bcd2bin(buff[2]);
|
|
else
|
|
tm->tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
|
|
|
|
tm->tm_wday = bcd2bin(buff[3]);
|
|
tm->tm_mday = bcd2bin(buff[4]);
|
|
tm->tm_mon = bcd2bin(buff[5] & 0x1f) - 1; /* back to system 0-11 */
|
|
tm->tm_year = bcd2bin(buff[6]) + 100 * cent_flag;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rc5t619_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
u8 buff[7];
|
|
int err;
|
|
int cent_flag;
|
|
unsigned int ctrl1;
|
|
unsigned int ctrl2;
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (ctrl2 & CTRL2_PON)
|
|
rc5t619_rtc_pon_setup(dev);
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (tm->tm_year >= 100)
|
|
cent_flag = 1;
|
|
else
|
|
cent_flag = 0;
|
|
|
|
buff[0] = bin2bcd(tm->tm_sec);
|
|
buff[1] = bin2bcd(tm->tm_min);
|
|
|
|
if (ctrl1 & CTRL1_24HR)
|
|
buff[2] = bin2bcd(tm->tm_hour);
|
|
else
|
|
buff[2] = rtc5t619_12hour_bin2bcd(tm->tm_hour);
|
|
|
|
buff[3] = bin2bcd(tm->tm_wday);
|
|
buff[4] = bin2bcd(tm->tm_mday);
|
|
buff[5] = bin2bcd(tm->tm_mon + 1); /* system set 0-11 */
|
|
buff[6] = bin2bcd(tm->tm_year - cent_flag * 100);
|
|
|
|
if (cent_flag)
|
|
buff[5] |= MONTH_CENTFLAG;
|
|
|
|
err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_SECONDS,
|
|
buff, sizeof(buff));
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to program new time: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 0-disable, 1-enable */
|
|
static int rc5t619_rtc_alarm_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
return regmap_update_bits(rtc->rn5t618->regmap,
|
|
RN5T618_RTC_CTRL1,
|
|
CTRL1_ALARM_ENABLED,
|
|
enabled ? CTRL1_ALARM_ENABLED : 0);
|
|
}
|
|
|
|
static int rc5t619_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
u8 buff[6];
|
|
unsigned int buff_cent;
|
|
int err;
|
|
int cent_flag;
|
|
unsigned int ctrl1;
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
|
|
if (err)
|
|
return err;
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_MONTH, &buff_cent);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to read time: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
if (buff_cent & MONTH_CENTFLAG)
|
|
cent_flag = 1;
|
|
else
|
|
cent_flag = 0;
|
|
|
|
err = regmap_bulk_read(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
|
|
buff, sizeof(buff));
|
|
if (err)
|
|
return err;
|
|
|
|
buff[3] = buff[3] & 0x3f;
|
|
|
|
alrm->time.tm_sec = bcd2bin(buff[0]);
|
|
alrm->time.tm_min = bcd2bin(buff[1]);
|
|
|
|
if (ctrl1 & CTRL1_24HR)
|
|
alrm->time.tm_hour = bcd2bin(buff[2]);
|
|
else
|
|
alrm->time.tm_hour = rtc5t619_12hour_bcd2bin(buff[2]);
|
|
|
|
alrm->time.tm_mday = bcd2bin(buff[3]);
|
|
alrm->time.tm_mon = bcd2bin(buff[4]) - 1;
|
|
alrm->time.tm_year = bcd2bin(buff[5]) + 100 * cent_flag;
|
|
alrm->enabled = !!(ctrl1 & CTRL1_ALARM_ENABLED);
|
|
dev_dbg(dev, "read alarm: %ptR\n", &alrm->time);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rc5t619_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
u8 buff[6];
|
|
int err;
|
|
int cent_flag;
|
|
unsigned int ctrl1;
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL1, &ctrl1);
|
|
if (err)
|
|
return err;
|
|
|
|
err = rc5t619_rtc_alarm_enable(dev, 0);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (rtc->irq == -1)
|
|
return -EINVAL;
|
|
|
|
if (alrm->enabled == 0)
|
|
return 0;
|
|
|
|
if (alrm->time.tm_year >= 100)
|
|
cent_flag = 1;
|
|
else
|
|
cent_flag = 0;
|
|
|
|
alrm->time.tm_mon += 1;
|
|
buff[0] = bin2bcd(alrm->time.tm_sec);
|
|
buff[1] = bin2bcd(alrm->time.tm_min);
|
|
|
|
if (ctrl1 & CTRL1_24HR)
|
|
buff[2] = bin2bcd(alrm->time.tm_hour);
|
|
else
|
|
buff[2] = rtc5t619_12hour_bin2bcd(alrm->time.tm_hour);
|
|
|
|
buff[3] = bin2bcd(alrm->time.tm_mday);
|
|
buff[4] = bin2bcd(alrm->time.tm_mon);
|
|
buff[5] = bin2bcd(alrm->time.tm_year - 100 * cent_flag);
|
|
buff[3] |= MDAY_DAL_EXT;
|
|
|
|
err = regmap_bulk_write(rtc->rn5t618->regmap, RN5T618_RTC_ALARM_Y_SEC,
|
|
buff, sizeof(buff));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return rc5t619_rtc_alarm_enable(dev, alrm->enabled);
|
|
}
|
|
|
|
static const struct rtc_class_ops rc5t619_rtc_ops = {
|
|
.read_time = rc5t619_rtc_read_time,
|
|
.set_time = rc5t619_rtc_set_time,
|
|
.set_alarm = rc5t619_rtc_set_alarm,
|
|
.read_alarm = rc5t619_rtc_read_alarm,
|
|
.alarm_irq_enable = rc5t619_rtc_alarm_enable,
|
|
};
|
|
|
|
static int rc5t619_rtc_alarm_flag_clr(struct device *dev)
|
|
{
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
/* clear alarm-D status bits.*/
|
|
return regmap_update_bits(rtc->rn5t618->regmap,
|
|
RN5T618_RTC_CTRL2,
|
|
CTRL2_ALARM_STATUS | CTRL2_CTC, 0);
|
|
}
|
|
|
|
static irqreturn_t rc5t619_rtc_irq(int irq, void *data)
|
|
{
|
|
struct device *dev = data;
|
|
struct rc5t619_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
rc5t619_rtc_alarm_flag_clr(dev);
|
|
|
|
rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int rc5t619_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct rn5t618 *rn5t618 = dev_get_drvdata(pdev->dev.parent);
|
|
struct rc5t619_rtc *rtc;
|
|
unsigned int ctrl2;
|
|
int err;
|
|
|
|
rtc = devm_kzalloc(dev, sizeof(*rtc), GFP_KERNEL);
|
|
if (!rtc)
|
|
return -ENOMEM;
|
|
|
|
rtc->rn5t618 = rn5t618;
|
|
|
|
dev_set_drvdata(dev, rtc);
|
|
rtc->irq = -1;
|
|
|
|
if (rn5t618->irq_data)
|
|
rtc->irq = regmap_irq_get_virq(rn5t618->irq_data,
|
|
RN5T618_IRQ_RTC);
|
|
|
|
if (rtc->irq < 0)
|
|
rtc->irq = -1;
|
|
|
|
err = regmap_read(rtc->rn5t618->regmap, RN5T618_RTC_CTRL2, &ctrl2);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* disable rtc periodic function */
|
|
err = rc5t619_rtc_periodic_disable(&pdev->dev);
|
|
if (err)
|
|
return err;
|
|
|
|
if (ctrl2 & CTRL2_PON) {
|
|
err = rc5t619_rtc_alarm_flag_clr(&pdev->dev);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
|
|
if (IS_ERR(rtc->rtc)) {
|
|
err = PTR_ERR(rtc->rtc);
|
|
dev_err(dev, "RTC device register: err %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
rtc->rtc->ops = &rc5t619_rtc_ops;
|
|
rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
|
|
rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
|
|
|
|
/* set interrupt and enable it */
|
|
if (rtc->irq != -1) {
|
|
err = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
|
|
rc5t619_rtc_irq,
|
|
IRQF_ONESHOT,
|
|
"rtc-rc5t619",
|
|
&pdev->dev);
|
|
if (err < 0) {
|
|
dev_err(&pdev->dev, "request IRQ:%d fail\n", rtc->irq);
|
|
rtc->irq = -1;
|
|
|
|
err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
} else {
|
|
/* enable wake */
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
enable_irq_wake(rtc->irq);
|
|
}
|
|
} else {
|
|
/* system don't want to using alarm interrupt, so close it */
|
|
err = rc5t619_rtc_alarm_enable(&pdev->dev, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
dev_warn(&pdev->dev, "rc5t619 interrupt is disabled\n");
|
|
}
|
|
|
|
return devm_rtc_register_device(rtc->rtc);
|
|
}
|
|
|
|
static struct platform_driver rc5t619_rtc_driver = {
|
|
.driver = {
|
|
.name = "rc5t619-rtc",
|
|
},
|
|
.probe = rc5t619_rtc_probe,
|
|
};
|
|
|
|
module_platform_driver(rc5t619_rtc_driver);
|
|
MODULE_ALIAS("platform:rc5t619-rtc");
|
|
MODULE_DESCRIPTION("RICOH RC5T619 RTC driver");
|
|
MODULE_LICENSE("GPL");
|