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Date:   Fri, 25 Jan 2019 13:05:36 +0200
From:   Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
To:     mazziesaccount@gmail.com, matti.vaittinen@fi.rohmeurope.com
Cc:     heikki.haikola@fi.rohmeurope.com, mikko.mutanen@fi.rohmeurope.com,
        lee.jones@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com,
        broonie@kernel.org, gregkh@linuxfoundation.org, rafael@kernel.org,
        mturquette@baylibre.com, sboyd@kernel.org,
        linus.walleij@linaro.org, bgolaszewski@baylibre.com,
        sre@kernel.org, lgirdwood@gmail.com, a.zummo@towertech.it,
        alexandre.belloni@bootlin.com, wim@linux-watchdog.org,
        linux@roeck-us.net, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org,
        linux-gpio@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-rtc@vger.kernel.org, linux-watchdog@vger.kernel.org
Subject: [RFC PATCH v2 08/10] rtc: bd70528: Initial support for ROHM bd70528
 RTC
Message-ID: <20190125110536.GA29321@localhost.localdomain>
MIME-Version: 1.0
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User-Agent: Mutt/1.9.2 (2017-12-15)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Support RTC block in ROHM bd70528 power management IC. Support
getting and setting the time and date as well as arming an alarm
which can also be used to wake the PMIC from standby state.

HW supports wake interrupt only for the next 24 hours (sec, minute
and hour information only) so we limit also the alarm interrupt to
this 24 hours for the sake of consistency.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
---
 drivers/rtc/Kconfig       |   8 +
 drivers/rtc/Makefile      |   1 +
 drivers/rtc/rtc-bd70528.c | 451 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 460 insertions(+)
 create mode 100644 drivers/rtc/rtc-bd70528.c

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 225b0b8516f3..df6211cbd83f 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -487,6 +487,14 @@ config RTC_DRV_M41T80_WDT
 	help
 	  If you say Y here you will get support for the
 	  watchdog timer in the ST M41T60 and M41T80 RTC chips series.
+config RTC_DRV_BD70528
+	tristate "ROHM BD70528 PMIC RTC"
+	help
+	  If you say Y here you will get support for the RTC
+	  on ROHM BD70528 Power Management IC.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-bd70528.
 
 config RTC_DRV_BQ32K
 	tristate "TI BQ32000"
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index df022d820bee..740b13840913 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_RTC_DRV_ASM9260)	+= rtc-asm9260.o
 obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
 obj-$(CONFIG_RTC_DRV_AT91SAM9)	+= rtc-at91sam9.o
 obj-$(CONFIG_RTC_DRV_AU1XXX)	+= rtc-au1xxx.o
+obj-$(CONFIG_RTC_DRV_BD70528)	+= rtc-bd70528.o
 obj-$(CONFIG_RTC_DRV_BQ32K)	+= rtc-bq32k.o
 obj-$(CONFIG_RTC_DRV_BQ4802)	+= rtc-bq4802.o
 obj-$(CONFIG_RTC_DRV_BRCMSTB)	+= rtc-brcmstb-waketimer.o
diff --git a/drivers/rtc/rtc-bd70528.c b/drivers/rtc/rtc-bd70528.c
new file mode 100644
index 000000000000..250fb218c784
--- /dev/null
+++ b/drivers/rtc/rtc-bd70528.c
@@ -0,0 +1,451 @@
+// 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/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 to avoid padding issues.
+ */
+struct bd70528_rtc_day {
+	u8 sec;
+	u8 min;
+	u8 hour;
+};
+
+struct bd70528_rtc_data {
+	struct bd70528_rtc_day time;
+	u8 week;
+	u8 day;
+	u8 month;
+	u8 year;
+};
+
+struct bd70528_rtc_wake {
+	struct bd70528_rtc_day time;
+	u8 ctrl;
+};
+
+struct bd70528_rtc_alm {
+	struct bd70528_rtc_data data;
+	u8 alm_mask;
+	u8 alm_repeat;
+};
+
+struct bd70528_rtc {
+	struct bd70528 *mfd;
+	struct device *dev;
+};
+
+static int bd70528_set_wake(struct bd70528 *bd70528,
+			    int enable, int *old_state)
+{
+	int ret;
+	unsigned int ctrl_reg;
+
+	ret = regmap_read(bd70528->chip.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->chip.regmap, BD70528_REG_WAKE_EN,
+			    ctrl_reg);
+}
+
+static int bd70528_set_elapsed_tmr(struct bd70528 *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->chip.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->chip.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 = r->mfd->wdt_set(r->mfd, 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->mfd,
+				      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->mfd, 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)
+{
+	int ret;
+
+	ret = bd70528_set_rtc_based_timers(r, old_state, NULL);
+	mutex_unlock(&r->mfd->rtc_timer_lock);
+
+	return ret;
+}
+
+static int bd70528_disable_rtc_based_timers(struct bd70528_rtc *r,
+							int *old_state)
+{
+	mutex_lock(&r->mfd->rtc_timer_lock);
+
+	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 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 bd70528 *bd70528 = r->mfd;
+
+	ret = regmap_bulk_read(bd70528->chip.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(bd70528->chip.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(bd70528->chip.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(bd70528->chip.regmap, BD70528_REG_RTC_ALM_START,
+				&alm, sizeof(alm));
+	if (ret)
+		dev_err(dev, "Failed to set alarm time\n");
+
+	return ret;
+}
+
+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 bd70528 *bd70528 = r->mfd;
+
+	ret = regmap_bulk_read(bd70528->chip.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;
+	if (alm.alm_mask & BD70528_MASK_ALM_EN)
+		a->enabled = 0;
+	else
+		a->enabled = 1;
+
+	a->pending = 0;
+
+	return 0;
+}
+
+static int bd70528_set_time(struct device *dev, struct rtc_time *t)
+{
+	int ret, old_states;
+	struct bd70528_rtc_data rtc_data;
+	struct bd70528_rtc *r = dev_get_drvdata(dev);
+	struct bd70528 *bd70528 = r->mfd;
+
+	ret = bd70528_disable_rtc_based_timers(r, &old_states);
+
+	ret = regmap_bulk_read(bd70528->chip.regmap,
+			       BD70528_REG_RTC_START, &rtc_data,
+			       sizeof(rtc_data));
+
+	tm2rtc(t, &rtc_data);
+
+	ret = regmap_bulk_write(bd70528->chip.regmap,
+				BD70528_REG_RTC_START, &rtc_data,
+				sizeof(rtc_data));
+
+	ret = bd70528_re_enable_rtc_based_timers(r, old_states);
+
+	return 0;
+}
+static int bd70528_get_time(struct device *dev, struct rtc_time *t)
+{
+	struct bd70528_rtc *r = dev_get_drvdata(dev);
+	struct bd70528 *bd70528 = r->mfd;
+	struct bd70528_rtc_data rtc_data;
+	int ret;
+
+	/* read the RTC date and time registers all at once */
+	ret = regmap_bulk_read(bd70528->chip.regmap,
+			       BD70528_REG_RTC_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 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,
+};
+
+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;
+	struct bd70528 *mfd;
+	int ret;
+	struct rtc_device *rtc;
+	int irq;
+	unsigned int hr;
+
+	mfd = dev_get_drvdata(pdev->dev.parent);
+	if (!mfd) {
+		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->mfd = mfd;
+	bd_rtc->dev = &pdev->dev;
+
+	irq = platform_get_irq_byname(pdev, "bd70528-rtc-alm");
+
+	if (irq < 0) {
+		dev_err(&pdev->dev, "Failed to get irq\n");
+		return irq;
+	}
+
+	platform_set_drvdata(pdev, bd_rtc);
+
+	ret = regmap_read(mfd->chip.regmap, BD70528_REG_RTC_HOUR, &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 = bd70528_get_time(&pdev->dev, &t);
+		if (ret)
+			return ret;
+
+		ret = bd70528_set_time(&pdev->dev, &t);
+		if (ret)
+			return ret;
+	}
+
+	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_device_register(&pdev->dev, "bd70528-rtc",
+				       &bd70528_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc)) {
+		dev_err(&pdev->dev, "Registering RTC failed\n");
+		return PTR_ERR(rtc);
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, &alm_hndlr,
+					IRQF_ONESHOT, "bd70528-rtc", rtc);
+
+	/*
+	 *  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.
+	 */
+	ret = regmap_update_bits(mfd->chip.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;
+}
+
+static struct platform_driver bd70528_rtc = {
+	.driver = {
+		.name = "bd70528-rtc"
+	},
+	.probe = bd70528_probe,
+};
+
+module_platform_driver(bd70528_rtc);
+
+MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
+MODULE_DESCRIPTION("BD70528 RTC driver");
+MODULE_LICENSE("GPL");
-- 
2.14.3


-- 
Matti Vaittinen
ROHM Semiconductors

~~~ "I don't think so," said Rene Descartes.  Just then, he vanished ~~~