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linux-sg2042/drivers/rtc/rtc-bd70528.c

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// SPDX-License-Identifier: GPL-2.0-or-later
//
// Copyright (C) 2018 ROHM Semiconductors
//
// RTC driver for ROHM BD70528 PMIC
#include <linux/bcd.h>
#include <linux/mfd/rohm-bd70528.h>
#include <linux/mfd/rohm-bd71828.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
/*
* We read regs RTC_SEC => RTC_YEAR
* this struct is ordered according to chip registers.
* Keep it u8 only (or packed) to avoid padding issues.
*/
struct bd70528_rtc_day {
u8 sec;
u8 min;
u8 hour;
} __packed;
struct bd70528_rtc_data {
struct bd70528_rtc_day time;
u8 week;
u8 day;
u8 month;
u8 year;
} __packed;
struct bd70528_rtc_wake {
struct bd70528_rtc_day time;
u8 ctrl;
} __packed;
struct bd71828_rtc_alm {
struct bd70528_rtc_data alm0;
struct bd70528_rtc_data alm1;
u8 alm_mask;
u8 alm1_mask;
} __packed;
struct bd70528_rtc_alm {
struct bd70528_rtc_data data;
u8 alm_mask;
u8 alm_repeat;
} __packed;
struct bd70528_rtc {
struct rohm_regmap_dev *parent;
struct device *dev;
u8 reg_time_start;
bool has_rtc_timers;
};
static int bd70528_set_wake(struct rohm_regmap_dev *bd70528,
int enable, int *old_state)
{
int ret;
unsigned int ctrl_reg;
ret = regmap_read(bd70528->regmap, BD70528_REG_WAKE_EN, &ctrl_reg);
if (ret)
return ret;
if (old_state) {
if (ctrl_reg & BD70528_MASK_WAKE_EN)
*old_state |= BD70528_WAKE_STATE_BIT;
else
*old_state &= ~BD70528_WAKE_STATE_BIT;
if (!enable == !(*old_state & BD70528_WAKE_STATE_BIT))
return 0;
}
if (enable)
ctrl_reg |= BD70528_MASK_WAKE_EN;
else
ctrl_reg &= ~BD70528_MASK_WAKE_EN;
return regmap_write(bd70528->regmap, BD70528_REG_WAKE_EN,
ctrl_reg);
}
static int bd70528_set_elapsed_tmr(struct rohm_regmap_dev *bd70528,
int enable, int *old_state)
{
int ret;
unsigned int ctrl_reg;
/*
* TBD
* What is the purpose of elapsed timer ?
* Is the timeout registers counting down, or is the disable - re-enable
* going to restart the elapsed-time counting? If counting is restarted
* the timeout should be decreased by the amount of time that has
* elapsed since starting the timer. Maybe we should store the monotonic
* clock value when timer is started so that if RTC is set while timer
* is armed we could do the compensation. This is a hack if RTC/system
* clk are drifting. OTOH, RTC controlled via I2C is in any case
* inaccurate...
*/
ret = regmap_read(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
&ctrl_reg);
if (ret)
return ret;
if (old_state) {
if (ctrl_reg & BD70528_MASK_ELAPSED_TIMER_EN)
*old_state |= BD70528_ELAPSED_STATE_BIT;
else
*old_state &= ~BD70528_ELAPSED_STATE_BIT;
if ((!enable) == (!(*old_state & BD70528_ELAPSED_STATE_BIT)))
return 0;
}
if (enable)
ctrl_reg |= BD70528_MASK_ELAPSED_TIMER_EN;
else
ctrl_reg &= ~BD70528_MASK_ELAPSED_TIMER_EN;
return regmap_write(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
ctrl_reg);
}
static int bd70528_set_rtc_based_timers(struct bd70528_rtc *r, int new_state,
int *old_state)
{
int ret;
ret = bd70528_wdt_set(r->parent, new_state & BD70528_WDT_STATE_BIT,
old_state);
if (ret) {
dev_err(r->dev,
"Failed to disable WDG for RTC setting (%d)\n", ret);
return ret;
}
ret = bd70528_set_elapsed_tmr(r->parent,
new_state & BD70528_ELAPSED_STATE_BIT,
old_state);
if (ret) {
dev_err(r->dev,
"Failed to disable 'elapsed timer' for RTC setting\n");
return ret;
}
ret = bd70528_set_wake(r->parent, new_state & BD70528_WAKE_STATE_BIT,
old_state);
if (ret) {
dev_err(r->dev,
"Failed to disable 'wake timer' for RTC setting\n");
return ret;
}
return ret;
}
static int bd70528_re_enable_rtc_based_timers(struct bd70528_rtc *r,
int old_state)
{
if (!r->has_rtc_timers)
return 0;
return bd70528_set_rtc_based_timers(r, old_state, NULL);
}
static int bd70528_disable_rtc_based_timers(struct bd70528_rtc *r,
int *old_state)
{
if (!r->has_rtc_timers)
return 0;
return bd70528_set_rtc_based_timers(r, 0, old_state);
}
static inline void tmday2rtc(struct rtc_time *t, struct bd70528_rtc_day *d)
{
d->sec &= ~BD70528_MASK_RTC_SEC;
d->min &= ~BD70528_MASK_RTC_MINUTE;
d->hour &= ~BD70528_MASK_RTC_HOUR;
d->sec |= bin2bcd(t->tm_sec);
d->min |= bin2bcd(t->tm_min);
d->hour |= bin2bcd(t->tm_hour);
}
static inline void tm2rtc(struct rtc_time *t, struct bd70528_rtc_data *r)
{
r->day &= ~BD70528_MASK_RTC_DAY;
r->week &= ~BD70528_MASK_RTC_WEEK;
r->month &= ~BD70528_MASK_RTC_MONTH;
/*
* PM and 24H bits are not used by Wake - thus we clear them
* here and not in tmday2rtc() which is also used by wake.
*/
r->time.hour &= ~(BD70528_MASK_RTC_HOUR_PM | BD70528_MASK_RTC_HOUR_24H);
tmday2rtc(t, &r->time);
/*
* We do always set time in 24H mode.
*/
r->time.hour |= BD70528_MASK_RTC_HOUR_24H;
r->day |= bin2bcd(t->tm_mday);
r->week |= bin2bcd(t->tm_wday);
r->month |= bin2bcd(t->tm_mon + 1);
r->year = bin2bcd(t->tm_year - 100);
}
static inline void rtc2tm(struct bd70528_rtc_data *r, struct rtc_time *t)
{
t->tm_sec = bcd2bin(r->time.sec & BD70528_MASK_RTC_SEC);
t->tm_min = bcd2bin(r->time.min & BD70528_MASK_RTC_MINUTE);
t->tm_hour = bcd2bin(r->time.hour & BD70528_MASK_RTC_HOUR);
/*
* If RTC is in 12H mode, then bit BD70528_MASK_RTC_HOUR_PM
* is not BCD value but tells whether it is AM or PM
*/
if (!(r->time.hour & BD70528_MASK_RTC_HOUR_24H)) {
t->tm_hour %= 12;
if (r->time.hour & BD70528_MASK_RTC_HOUR_PM)
t->tm_hour += 12;
}
t->tm_mday = bcd2bin(r->day & BD70528_MASK_RTC_DAY);
t->tm_mon = bcd2bin(r->month & BD70528_MASK_RTC_MONTH) - 1;
t->tm_year = 100 + bcd2bin(r->year & BD70528_MASK_RTC_YEAR);
t->tm_wday = bcd2bin(r->week & BD70528_MASK_RTC_WEEK);
}
static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a)
{
int ret;
struct bd71828_rtc_alm alm;
struct bd70528_rtc *r = dev_get_drvdata(dev);
struct rohm_regmap_dev *parent = r->parent;
ret = regmap_bulk_read(parent->regmap, BD71828_REG_RTC_ALM_START,
&alm, sizeof(alm));
if (ret) {
dev_err(dev, "Failed to read alarm regs\n");
return ret;
}
tm2rtc(&a->time, &alm.alm0);
if (!a->enabled)
alm.alm_mask &= ~BD70528_MASK_ALM_EN;
else
alm.alm_mask |= BD70528_MASK_ALM_EN;
ret = regmap_bulk_write(parent->regmap, BD71828_REG_RTC_ALM_START,
&alm, sizeof(alm));
if (ret)
dev_err(dev, "Failed to set alarm time\n");
return ret;
}
static int bd70528_set_alarm(struct device *dev, struct rtc_wkalrm *a)
{
struct bd70528_rtc_wake wake;
struct bd70528_rtc_alm alm;
int ret;
struct bd70528_rtc *r = dev_get_drvdata(dev);
struct rohm_regmap_dev *parent = r->parent;
ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_WAKE_START,
&wake, sizeof(wake));
if (ret) {
dev_err(dev, "Failed to read wake regs\n");
return ret;
}
ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_ALM_START,
&alm, sizeof(alm));
if (ret) {
dev_err(dev, "Failed to read alarm regs\n");
return ret;
}
tm2rtc(&a->time, &alm.data);
tmday2rtc(&a->time, &wake.time);
if (a->enabled) {
alm.alm_mask &= ~BD70528_MASK_ALM_EN;
wake.ctrl |= BD70528_MASK_WAKE_EN;
} else {
alm.alm_mask |= BD70528_MASK_ALM_EN;
wake.ctrl &= ~BD70528_MASK_WAKE_EN;
}
ret = regmap_bulk_write(parent->regmap,
BD70528_REG_RTC_WAKE_START, &wake,
sizeof(wake));
if (ret) {
dev_err(dev, "Failed to set wake time\n");
return ret;
}
ret = regmap_bulk_write(parent->regmap, BD70528_REG_RTC_ALM_START,
&alm, sizeof(alm));
if (ret)
dev_err(dev, "Failed to set alarm time\n");
return ret;
}
static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a)
{
int ret;
struct bd71828_rtc_alm alm;
struct bd70528_rtc *r = dev_get_drvdata(dev);
struct rohm_regmap_dev *parent = r->parent;
ret = regmap_bulk_read(parent->regmap, BD71828_REG_RTC_ALM_START,
&alm, sizeof(alm));
if (ret) {
dev_err(dev, "Failed to read alarm regs\n");
return ret;
}
rtc2tm(&alm.alm0, &a->time);
a->time.tm_mday = -1;
a->time.tm_mon = -1;
a->time.tm_year = -1;
a->enabled = !!(alm.alm_mask & BD70528_MASK_ALM_EN);
a->pending = 0;
return 0;
}
static int bd70528_read_alarm(struct device *dev, struct rtc_wkalrm *a)
{
struct bd70528_rtc_alm alm;
int ret;
struct bd70528_rtc *r = dev_get_drvdata(dev);
struct rohm_regmap_dev *parent = r->parent;
ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_ALM_START,
&alm, sizeof(alm));
if (ret) {
dev_err(dev, "Failed to read alarm regs\n");
return ret;
}
rtc2tm(&alm.data, &a->time);
a->time.tm_mday = -1;
a->time.tm_mon = -1;
a->time.tm_year = -1;
a->enabled = !(alm.alm_mask & BD70528_MASK_ALM_EN);
a->pending = 0;
return 0;
}
static int bd70528_set_time_locked(struct device *dev, struct rtc_time *t)
{
int ret, tmpret, old_states;
struct bd70528_rtc_data rtc_data;
struct bd70528_rtc *r = dev_get_drvdata(dev);
struct rohm_regmap_dev *parent = r->parent;
ret = bd70528_disable_rtc_based_timers(r, &old_states);
if (ret)
return ret;
tmpret = regmap_bulk_read(parent->regmap,
r->reg_time_start, &rtc_data,
sizeof(rtc_data));
if (tmpret) {
dev_err(dev, "Failed to read RTC time registers\n");
goto renable_out;
}
tm2rtc(t, &rtc_data);
tmpret = regmap_bulk_write(parent->regmap,
r->reg_time_start, &rtc_data,
sizeof(rtc_data));
if (tmpret) {
dev_err(dev, "Failed to set RTC time\n");
goto renable_out;
}
renable_out:
ret = bd70528_re_enable_rtc_based_timers(r, old_states);
if (tmpret)
ret = tmpret;
return ret;
}
static int bd71828_set_time(struct device *dev, struct rtc_time *t)
{
return bd70528_set_time_locked(dev, t);
}
static int bd70528_set_time(struct device *dev, struct rtc_time *t)
{
int ret;
struct bd70528_rtc *r = dev_get_drvdata(dev);
bd70528_wdt_lock(r->parent);
ret = bd70528_set_time_locked(dev, t);
bd70528_wdt_unlock(r->parent);
return ret;
}
static int bd70528_get_time(struct device *dev, struct rtc_time *t)
{
struct bd70528_rtc *r = dev_get_drvdata(dev);
struct rohm_regmap_dev *parent = r->parent;
struct bd70528_rtc_data rtc_data;
int ret;
/* read the RTC date and time registers all at once */
ret = regmap_bulk_read(parent->regmap,
r->reg_time_start, &rtc_data,
sizeof(rtc_data));
if (ret) {
dev_err(dev, "Failed to read RTC time (err %d)\n", ret);
return ret;
}
rtc2tm(&rtc_data, t);
return 0;
}
static int bd70528_alm_enable(struct device *dev, unsigned int enabled)
{
int ret;
unsigned int enableval = BD70528_MASK_ALM_EN;
struct bd70528_rtc *r = dev_get_drvdata(dev);
if (enabled)
enableval = 0;
bd70528_wdt_lock(r->parent);
ret = bd70528_set_wake(r->parent, enabled, NULL);
if (ret) {
dev_err(dev, "Failed to change wake state\n");
goto out_unlock;
}
ret = regmap_update_bits(r->parent->regmap, BD70528_REG_RTC_ALM_MASK,
BD70528_MASK_ALM_EN, enableval);
if (ret)
dev_err(dev, "Failed to change alarm state\n");
out_unlock:
bd70528_wdt_unlock(r->parent);
return ret;
}
static int bd71828_alm_enable(struct device *dev, unsigned int enabled)
{
int ret;
struct bd70528_rtc *r = dev_get_drvdata(dev);
unsigned int enableval = BD70528_MASK_ALM_EN;
if (!enabled)
enableval = 0;
ret = regmap_update_bits(r->parent->regmap, BD71828_REG_RTC_ALM0_MASK,
BD70528_MASK_ALM_EN, enableval);
if (ret)
dev_err(dev, "Failed to change alarm state\n");
return ret;
}
static const struct rtc_class_ops bd70528_rtc_ops = {
.read_time = bd70528_get_time,
.set_time = bd70528_set_time,
.read_alarm = bd70528_read_alarm,
.set_alarm = bd70528_set_alarm,
.alarm_irq_enable = bd70528_alm_enable,
};
static const struct rtc_class_ops bd71828_rtc_ops = {
.read_time = bd70528_get_time,
.set_time = bd71828_set_time,
.read_alarm = bd71828_read_alarm,
.set_alarm = bd71828_set_alarm,
.alarm_irq_enable = bd71828_alm_enable,
};
static irqreturn_t alm_hndlr(int irq, void *data)
{
struct rtc_device *rtc = data;
rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF | RTC_PF);
return IRQ_HANDLED;
}
static int bd70528_probe(struct platform_device *pdev)
{
struct bd70528_rtc *bd_rtc;
const struct rtc_class_ops *rtc_ops;
struct rohm_regmap_dev *parent;
const char *irq_name;
int ret;
struct rtc_device *rtc;
int irq;
unsigned int hr;
bool enable_main_irq = false;
u8 hour_reg;
enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
parent = dev_get_drvdata(pdev->dev.parent);
if (!parent) {
dev_err(&pdev->dev, "No MFD driver data\n");
return -EINVAL;
}
bd_rtc = devm_kzalloc(&pdev->dev, sizeof(*bd_rtc), GFP_KERNEL);
if (!bd_rtc)
return -ENOMEM;
bd_rtc->parent = parent;
bd_rtc->dev = &pdev->dev;
switch (chip) {
case ROHM_CHIP_TYPE_BD70528:
irq_name = "bd70528-rtc-alm";
bd_rtc->has_rtc_timers = true;
bd_rtc->reg_time_start = BD70528_REG_RTC_START;
hour_reg = BD70528_REG_RTC_HOUR;
enable_main_irq = true;
rtc_ops = &bd70528_rtc_ops;
break;
case ROHM_CHIP_TYPE_BD71828:
irq_name = "bd71828-rtc-alm-0";
bd_rtc->reg_time_start = BD71828_REG_RTC_START;
hour_reg = BD71828_REG_RTC_HOUR;
rtc_ops = &bd71828_rtc_ops;
break;
default:
dev_err(&pdev->dev, "Unknown chip\n");
return -ENOENT;
}
irq = platform_get_irq_byname(pdev, irq_name);
if (irq < 0)
return irq;
platform_set_drvdata(pdev, bd_rtc);
ret = regmap_read(parent->regmap, hour_reg, &hr);
if (ret) {
dev_err(&pdev->dev, "Failed to reag RTC clock\n");
return ret;
}
if (!(hr & BD70528_MASK_RTC_HOUR_24H)) {
struct rtc_time t;
ret = rtc_ops->read_time(&pdev->dev, &t);
if (!ret)
ret = rtc_ops->set_time(&pdev->dev, &t);
if (ret) {
dev_err(&pdev->dev,
"Setting 24H clock for RTC failed\n");
return ret;
}
}
device_set_wakeup_capable(&pdev->dev, true);
device_wakeup_enable(&pdev->dev);
rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc)) {
dev_err(&pdev->dev, "RTC device creation failed\n");
return PTR_ERR(rtc);
}
rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
rtc->range_max = RTC_TIMESTAMP_END_2099;
rtc->ops = rtc_ops;
/* Request alarm IRQ prior to registerig the RTC */
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, &alm_hndlr,
IRQF_ONESHOT, "bd70528-rtc", rtc);
if (ret)
return ret;
/*
* BD70528 irq controller is not touching the main mask register.
* So enable the RTC block interrupts at main level. We can just
* leave them enabled as irq-controller should disable irqs
* from sub-registers when IRQ is disabled or freed.
*/
if (enable_main_irq) {
ret = regmap_update_bits(parent->regmap,
BD70528_REG_INT_MAIN_MASK,
BD70528_INT_RTC_MASK, 0);
if (ret) {
dev_err(&pdev->dev, "Failed to enable RTC interrupts\n");
return ret;
}
}
return devm_rtc_register_device(rtc);
}
static const struct platform_device_id bd718x7_rtc_id[] = {
{ "bd70528-rtc", ROHM_CHIP_TYPE_BD70528 },
{ "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 },
{ },
};
MODULE_DEVICE_TABLE(platform, bd718x7_rtc_id);
static struct platform_driver bd70528_rtc = {
.driver = {
.name = "bd70528-rtc"
},
.probe = bd70528_probe,
.id_table = bd718x7_rtc_id,
};
module_platform_driver(bd70528_rtc);
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("ROHM BD70528 and BD71828 PMIC RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:bd70528-rtc");
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