[linux-2.6-block.git] / drivers / rtc / rtc-rk808.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * RTC driver for Rockchip RK808
 *
 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author: Chris Zhong <zyw@rock-chips.com>
 * Author: Zhang Qing <zhangqing@rock-chips.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/mfd/rk808.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>

/* RTC_CTRL_REG bitfields */
#define BIT_RTC_CTRL_REG_STOP_RTC_M		BIT(0)

/* RK808 has a shadowed register for saving a "frozen" RTC time.
 * When user setting "GET_TIME" to 1, the time will save in this shadowed
 * register. If set "READSEL" to 1, user read rtc time register, actually
 * get the time of that moment. If we need the real time, clr this bit.
 */
#define BIT_RTC_CTRL_REG_RTC_GET_TIME		BIT(6)
#define BIT_RTC_CTRL_REG_RTC_READSEL_M		BIT(7)
#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M	BIT(3)
#define RTC_STATUS_MASK		0xFE

#define SECONDS_REG_MSK		0x7F
#define MINUTES_REG_MAK		0x7F
#define HOURS_REG_MSK		0x3F
#define DAYS_REG_MSK		0x3F
#define MONTHS_REG_MSK		0x1F
#define YEARS_REG_MSK		0xFF
#define WEEKS_REG_MSK		0x7

/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */

#define NUM_TIME_REGS	(RK808_WEEKS_REG - RK808_SECONDS_REG + 1)
#define NUM_ALARM_REGS	(RK808_ALARM_YEARS_REG - RK808_ALARM_SECONDS_REG + 1)

struct rk_rtc_compat_reg {
	unsigned int ctrl_reg;
	unsigned int status_reg;
	unsigned int alarm_seconds_reg;
	unsigned int int_reg;
	unsigned int seconds_reg;
};

struct rk808_rtc {
	struct rk808 *rk808;
	struct rtc_device *rtc;
	struct rk_rtc_compat_reg *creg;
	int irq;
};

/*
 * The Rockchip calendar used by the RK808 counts November with 31 days. We use
 * these translation functions to convert its dates to/from the Gregorian
 * calendar used by the rest of the world. We arbitrarily define Jan 1st, 2016
 * as the day when both calendars were in sync, and treat all other dates
 * relative to that.
 * NOTE: Other system software (e.g. firmware) that reads the same hardware must
 * implement this exact same conversion algorithm, with the same anchor date.
 */
static time64_t nov2dec_transitions(struct rtc_time *tm)
{
	return (tm->tm_year + 1900) - 2016 + (tm->tm_mon + 1 > 11 ? 1 : 0);
}

static void rockchip_to_gregorian(struct rtc_time *tm)
{
	/* If it's Nov 31st, rtc_tm_to_time64() will count that like Dec 1st */
	time64_t time = rtc_tm_to_time64(tm);
	rtc_time64_to_tm(time + nov2dec_transitions(tm) * 86400, tm);
}

static void gregorian_to_rockchip(struct rtc_time *tm)
{
	time64_t extra_days = nov2dec_transitions(tm);
	time64_t time = rtc_tm_to_time64(tm);
	rtc_time64_to_tm(time - extra_days * 86400, tm);

	/* Compensate if we went back over Nov 31st (will work up to 2381) */
	if (nov2dec_transitions(tm) < extra_days) {
		if (tm->tm_mon + 1 == 11)
			tm->tm_mday++;	/* This may result in 31! */
		else
			rtc_time64_to_tm(time - (extra_days - 1) * 86400, tm);
	}
}

/* Read current time and date in RTC */
static int rk808_rtc_readtime(struct device *dev, struct rtc_time *tm)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	struct rk808 *rk808 = rk808_rtc->rk808;
	u8 rtc_data[NUM_TIME_REGS];
	int ret;

	/* Force an update of the shadowed registers right now */
	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
				 BIT_RTC_CTRL_REG_RTC_GET_TIME,
				 BIT_RTC_CTRL_REG_RTC_GET_TIME);
	if (ret) {
		dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
		return ret;
	}

	/*
	 * After we set the GET_TIME bit, the rtc time can't be read
	 * immediately. So we should wait up to 31.25 us, about one cycle of
	 * 32khz. If we clear the GET_TIME bit here, the time of i2c transfer
	 * certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency.
	 */
	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
				 BIT_RTC_CTRL_REG_RTC_GET_TIME,
				 0);
	if (ret) {
		dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
		return ret;
	}

	ret = regmap_bulk_read(rk808->regmap, rk808_rtc->creg->seconds_reg,
			       rtc_data, NUM_TIME_REGS);
	if (ret) {
		dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret);
		return ret;
	}

	tm->tm_sec = bcd2bin(rtc_data[0] & SECONDS_REG_MSK);
	tm->tm_min = bcd2bin(rtc_data[1] & MINUTES_REG_MAK);
	tm->tm_hour = bcd2bin(rtc_data[2] & HOURS_REG_MSK);
	tm->tm_mday = bcd2bin(rtc_data[3] & DAYS_REG_MSK);
	tm->tm_mon = (bcd2bin(rtc_data[4] & MONTHS_REG_MSK)) - 1;
	tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 100;
	tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK);
	rockchip_to_gregorian(tm);
	dev_dbg(dev, "RTC date/time %ptRd(%d) %ptRt\n", tm, tm->tm_wday, tm);

	return ret;
}

/* Set current time and date in RTC */
static int rk808_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	struct rk808 *rk808 = rk808_rtc->rk808;
	u8 rtc_data[NUM_TIME_REGS];
	int ret;

	dev_dbg(dev, "set RTC date/time %ptRd(%d) %ptRt\n", tm, tm->tm_wday, tm);
	gregorian_to_rockchip(tm);
	rtc_data[0] = bin2bcd(tm->tm_sec);
	rtc_data[1] = bin2bcd(tm->tm_min);
	rtc_data[2] = bin2bcd(tm->tm_hour);
	rtc_data[3] = bin2bcd(tm->tm_mday);
	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	rtc_data[5] = bin2bcd(tm->tm_year - 100);
	rtc_data[6] = bin2bcd(tm->tm_wday);

	/* Stop RTC while updating the RTC registers */
	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
				 BIT_RTC_CTRL_REG_STOP_RTC_M,
				 BIT_RTC_CTRL_REG_STOP_RTC_M);
	if (ret) {
		dev_err(dev, "Failed to update RTC control: %d\n", ret);
		return ret;
	}

	ret = regmap_bulk_write(rk808->regmap, rk808_rtc->creg->seconds_reg,
				rtc_data, NUM_TIME_REGS);
	if (ret) {
		dev_err(dev, "Failed to bull write rtc_data: %d\n", ret);
		return ret;
	}
	/* Start RTC again */
	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
				 BIT_RTC_CTRL_REG_STOP_RTC_M, 0);
	if (ret) {
		dev_err(dev, "Failed to update RTC control: %d\n", ret);
		return ret;
	}
	return 0;
}

/* Read alarm time and date in RTC */
static int rk808_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	struct rk808 *rk808 = rk808_rtc->rk808;
	u8 alrm_data[NUM_ALARM_REGS];
	uint32_t int_reg;
	int ret;

	ret = regmap_bulk_read(rk808->regmap,
			       rk808_rtc->creg->alarm_seconds_reg,
			       alrm_data, NUM_ALARM_REGS);
	if (ret) {
		dev_err(dev, "Failed to read RTC alarm date REG: %d\n", ret);
		return ret;
	}

	alrm->time.tm_sec = bcd2bin(alrm_data[0] & SECONDS_REG_MSK);
	alrm->time.tm_min = bcd2bin(alrm_data[1] & MINUTES_REG_MAK);
	alrm->time.tm_hour = bcd2bin(alrm_data[2] & HOURS_REG_MSK);
	alrm->time.tm_mday = bcd2bin(alrm_data[3] & DAYS_REG_MSK);
	alrm->time.tm_mon = (bcd2bin(alrm_data[4] & MONTHS_REG_MSK)) - 1;
	alrm->time.tm_year = (bcd2bin(alrm_data[5] & YEARS_REG_MSK)) + 100;
	rockchip_to_gregorian(&alrm->time);

	ret = regmap_read(rk808->regmap, rk808_rtc->creg->int_reg, &int_reg);
	if (ret) {
		dev_err(dev, "Failed to read RTC INT REG: %d\n", ret);
		return ret;
	}

	dev_dbg(dev, "alrm read RTC date/time %ptRd(%d) %ptRt\n",
		&alrm->time, alrm->time.tm_wday, &alrm->time);

	alrm->enabled = (int_reg & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M) ? 1 : 0;

	return 0;
}

static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc)
{
	struct rk808 *rk808 = rk808_rtc->rk808;
	int ret;

	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->int_reg,
				 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, 0);

	return ret;
}

static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc)
{
	struct rk808 *rk808 = rk808_rtc->rk808;
	int ret;

	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->int_reg,
				 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M,
				 BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);

	return ret;
}

static int rk808_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	struct rk808 *rk808 = rk808_rtc->rk808;
	u8 alrm_data[NUM_ALARM_REGS];
	int ret;

	ret = rk808_rtc_stop_alarm(rk808_rtc);
	if (ret) {
		dev_err(dev, "Failed to stop alarm: %d\n", ret);
		return ret;
	}
	dev_dbg(dev, "alrm set RTC date/time %ptRd(%d) %ptRt\n",
		&alrm->time, alrm->time.tm_wday, &alrm->time);

	gregorian_to_rockchip(&alrm->time);
	alrm_data[0] = bin2bcd(alrm->time.tm_sec);
	alrm_data[1] = bin2bcd(alrm->time.tm_min);
	alrm_data[2] = bin2bcd(alrm->time.tm_hour);
	alrm_data[3] = bin2bcd(alrm->time.tm_mday);
	alrm_data[4] = bin2bcd(alrm->time.tm_mon + 1);
	alrm_data[5] = bin2bcd(alrm->time.tm_year - 100);

	ret = regmap_bulk_write(rk808->regmap,
				rk808_rtc->creg->alarm_seconds_reg,
				alrm_data, NUM_ALARM_REGS);
	if (ret) {
		dev_err(dev, "Failed to bulk write: %d\n", ret);
		return ret;
	}
	if (alrm->enabled) {
		ret = rk808_rtc_start_alarm(rk808_rtc);
		if (ret) {
			dev_err(dev, "Failed to start alarm: %d\n", ret);
			return ret;
		}
	}
	return 0;
}

static int rk808_rtc_alarm_irq_enable(struct device *dev,
				      unsigned int enabled)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);

	if (enabled)
		return rk808_rtc_start_alarm(rk808_rtc);

	return rk808_rtc_stop_alarm(rk808_rtc);
}

/*
 * We will just handle setting the frequency and make use the framework for
 * reading the periodic interupts.
 *
 * @freq: Current periodic IRQ freq:
 * bit 0: every second
 * bit 1: every minute
 * bit 2: every hour
 * bit 3: every day
 */
static irqreturn_t rk808_alarm_irq(int irq, void *data)
{
	struct rk808_rtc *rk808_rtc = data;
	struct rk808 *rk808 = rk808_rtc->rk808;
	struct i2c_client *client = rk808->i2c;
	int ret;

	ret = regmap_write(rk808->regmap, rk808_rtc->creg->status_reg,
			   RTC_STATUS_MASK);
	if (ret) {
		dev_err(&client->dev,
			"%s:Failed to update RTC status: %d\n", __func__, ret);
		return ret;
	}

	rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF | RTC_AF);
	dev_dbg(&client->dev,
		 "%s:irq=%d\n", __func__, irq);
	return IRQ_HANDLED;
}

static const struct rtc_class_ops rk808_rtc_ops = {
	.read_time = rk808_rtc_readtime,
	.set_time = rk808_rtc_set_time,
	.read_alarm = rk808_rtc_readalarm,
	.set_alarm = rk808_rtc_setalarm,
	.alarm_irq_enable = rk808_rtc_alarm_irq_enable,
};

#ifdef CONFIG_PM_SLEEP
/* Turn off the alarm if it should not be a wake source. */
static int rk808_rtc_suspend(struct device *dev)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(rk808_rtc->irq);

	return 0;
}

/* Enable the alarm if it should be enabled (in case it was disabled to
 * prevent use as a wake source).
 */
static int rk808_rtc_resume(struct device *dev)
{
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(rk808_rtc->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(rk808_rtc_pm_ops,
	rk808_rtc_suspend, rk808_rtc_resume);

static struct rk_rtc_compat_reg rk808_creg = {
	.ctrl_reg = RK808_RTC_CTRL_REG,
	.status_reg = RK808_RTC_STATUS_REG,
	.alarm_seconds_reg = RK808_ALARM_SECONDS_REG,
	.int_reg = RK808_RTC_INT_REG,
	.seconds_reg = RK808_SECONDS_REG,
};

static struct rk_rtc_compat_reg rk817_creg = {
	.ctrl_reg = RK817_RTC_CTRL_REG,
	.status_reg = RK817_RTC_STATUS_REG,
	.alarm_seconds_reg = RK817_ALARM_SECONDS_REG,
	.int_reg = RK817_RTC_INT_REG,
	.seconds_reg = RK817_SECONDS_REG,
};

static int rk808_rtc_probe(struct platform_device *pdev)
{
	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	struct rk808_rtc *rk808_rtc;
	int ret;

	rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL);
	if (rk808_rtc == NULL)
		return -ENOMEM;

	switch (rk808->variant) {
	case RK809_ID:
	case RK817_ID:
		rk808_rtc->creg = &rk817_creg;
		break;
	default:
		rk808_rtc->creg = &rk808_creg;
		break;
	}
	platform_set_drvdata(pdev, rk808_rtc);
	rk808_rtc->rk808 = rk808;

	/* start rtc running by default, and use shadowed timer. */
	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
				 BIT_RTC_CTRL_REG_STOP_RTC_M |
				 BIT_RTC_CTRL_REG_RTC_READSEL_M,
				 BIT_RTC_CTRL_REG_RTC_READSEL_M);
	if (ret) {
		dev_err(&pdev->dev,
			"Failed to update RTC control: %d\n", ret);
		return ret;
	}

	ret = regmap_write(rk808->regmap, rk808_rtc->creg->status_reg,
			   RTC_STATUS_MASK);
	if (ret) {
		dev_err(&pdev->dev,
			"Failed to write RTC status: %d\n", ret);
		return ret;
	}

	device_init_wakeup(&pdev->dev, 1);

	rk808_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
	if (IS_ERR(rk808_rtc->rtc))
		return PTR_ERR(rk808_rtc->rtc);

	rk808_rtc->rtc->ops = &rk808_rtc_ops;

	rk808_rtc->irq = platform_get_irq(pdev, 0);
	if (rk808_rtc->irq < 0)
		return rk808_rtc->irq;

	/* request alarm irq of rk808 */
	ret = devm_request_threaded_irq(&pdev->dev, rk808_rtc->irq, NULL,
					rk808_alarm_irq, 0,
					"RTC alarm", rk808_rtc);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
			rk808_rtc->irq, ret);
		return ret;
	}

	return rtc_register_device(rk808_rtc->rtc);
}

static struct platform_driver rk808_rtc_driver = {
	.probe = rk808_rtc_probe,
	.driver = {
		.name = "rk808-rtc",
		.pm = &rk808_rtc_pm_ops,
	},
};

module_platform_driver(rk808_rtc_driver);

MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs");
MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-rtc");
Commit	Line	Data
2025cf9e	1	// SPDX-License-Identifier: GPL-2.0-only
3ca1e326 CZ	2	/*
	3	* RTC driver for Rockchip RK808
	4	*
	5	* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
	6	*
	7	* Author: Chris Zhong <zyw@rock-chips.com>
	8	* Author: Zhang Qing <zhangqing@rock-chips.com>
3ca1e326 CZ	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/kernel.h>
	13	#include <linux/rtc.h>
	14	#include <linux/bcd.h>
	15	#include <linux/mfd/rk808.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/i2c.h>
	18
	19	/* RTC_CTRL_REG bitfields */
	20	#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0)
	21
	22	/* RK808 has a shadowed register for saving a "frozen" RTC time.
	23	* When user setting "GET_TIME" to 1, the time will save in this shadowed
	24	* register. If set "READSEL" to 1, user read rtc time register, actually
	25	* get the time of that moment. If we need the real time, clr this bit.
	26	*/
	27	#define BIT_RTC_CTRL_REG_RTC_GET_TIME BIT(6)
	28	#define BIT_RTC_CTRL_REG_RTC_READSEL_M BIT(7)
	29	#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M BIT(3)
	30	#define RTC_STATUS_MASK 0xFE
	31
	32	#define SECONDS_REG_MSK 0x7F
	33	#define MINUTES_REG_MAK 0x7F
	34	#define HOURS_REG_MSK 0x3F
	35	#define DAYS_REG_MSK 0x3F
	36	#define MONTHS_REG_MSK 0x1F
	37	#define YEARS_REG_MSK 0xFF
	38	#define WEEKS_REG_MSK 0x7
	39
	40	/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
	41
	42	#define NUM_TIME_REGS (RK808_WEEKS_REG - RK808_SECONDS_REG + 1)
	43	#define NUM_ALARM_REGS (RK808_ALARM_YEARS_REG - RK808_ALARM_SECONDS_REG + 1)
	44
dc79054a TX	45	struct rk_rtc_compat_reg {
	46	unsigned int ctrl_reg;
	47	unsigned int status_reg;
	48	unsigned int alarm_seconds_reg;
	49	unsigned int int_reg;
	50	unsigned int seconds_reg;
	51	};
	52
3ca1e326 CZ	53	struct rk808_rtc {
	54	struct rk808 *rk808;
	55	struct rtc_device *rtc;
dc79054a	56	struct rk_rtc_compat_reg *creg;
3ca1e326 CZ	57	int irq;
	58	};
	59
f076ef44 JW	60	/*
	61	* The Rockchip calendar used by the RK808 counts November with 31 days. We use
	62	* these translation functions to convert its dates to/from the Gregorian
	63	* calendar used by the rest of the world. We arbitrarily define Jan 1st, 2016
	64	* as the day when both calendars were in sync, and treat all other dates
	65	* relative to that.
	66	* NOTE: Other system software (e.g. firmware) that reads the same hardware must
	67	* implement this exact same conversion algorithm, with the same anchor date.
	68	*/
	69	static time64_t nov2dec_transitions(struct rtc_time *tm)
	70	{
	71	return (tm->tm_year + 1900) - 2016 + (tm->tm_mon + 1 > 11 ? 1 : 0);
	72	}
	73
	74	static void rockchip_to_gregorian(struct rtc_time *tm)
	75	{
	76	/* If it's Nov 31st, rtc_tm_to_time64() will count that like Dec 1st */
	77	time64_t time = rtc_tm_to_time64(tm);
	78	rtc_time64_to_tm(time + nov2dec_transitions(tm) * 86400, tm);
	79	}
	80
	81	static void gregorian_to_rockchip(struct rtc_time *tm)
	82	{
	83	time64_t extra_days = nov2dec_transitions(tm);
	84	time64_t time = rtc_tm_to_time64(tm);
	85	rtc_time64_to_tm(time - extra_days * 86400, tm);
	86
	87	/* Compensate if we went back over Nov 31st (will work up to 2381) */
	88	if (nov2dec_transitions(tm) < extra_days) {
	89	if (tm->tm_mon + 1 == 11)
	90	tm->tm_mday++; /* This may result in 31! */
	91	else
	92	rtc_time64_to_tm(time - (extra_days - 1) * 86400, tm);
	93	}
	94	}
	95
3ca1e326 CZ	96	/* Read current time and date in RTC */
	97	static int rk808_rtc_readtime(struct device dev, struct rtc_time tm)
	98	{
	99	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	100	struct rk808 *rk808 = rk808_rtc->rk808;
	101	u8 rtc_data[NUM_TIME_REGS];
	102	int ret;
	103
	104	/* Force an update of the shadowed registers right now */
dc79054a	105	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
3ca1e326	106	BIT_RTC_CTRL_REG_RTC_GET_TIME,
c412c603	107	BIT_RTC_CTRL_REG_RTC_GET_TIME);
3ca1e326 CZ	108	if (ret) {
	109	dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
	110	return ret;
	111	}
	112
c412c603 CZ	113	/*
	114	* After we set the GET_TIME bit, the rtc time can't be read
	115	* immediately. So we should wait up to 31.25 us, about one cycle of
	116	* 32khz. If we clear the GET_TIME bit here, the time of i2c transfer
	117	* certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency.
	118	*/
dc79054a	119	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
3ca1e326	120	BIT_RTC_CTRL_REG_RTC_GET_TIME,
c412c603	121	0);
3ca1e326 CZ	122	if (ret) {
	123	dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
	124	return ret;
	125	}
	126
dc79054a	127	ret = regmap_bulk_read(rk808->regmap, rk808_rtc->creg->seconds_reg,
3ca1e326 CZ	128	rtc_data, NUM_TIME_REGS);
	129	if (ret) {
	130	dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret);
	131	return ret;
	132	}
	133
	134	tm->tm_sec = bcd2bin(rtc_data[0] & SECONDS_REG_MSK);
	135	tm->tm_min = bcd2bin(rtc_data[1] & MINUTES_REG_MAK);
	136	tm->tm_hour = bcd2bin(rtc_data[2] & HOURS_REG_MSK);
	137	tm->tm_mday = bcd2bin(rtc_data[3] & DAYS_REG_MSK);
	138	tm->tm_mon = (bcd2bin(rtc_data[4] & MONTHS_REG_MSK)) - 1;
	139	tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 100;
	140	tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK);
f076ef44	141	rockchip_to_gregorian(tm);
0991e754	142	dev_dbg(dev, "RTC date/time %ptRd(%d) %ptRt\n", tm, tm->tm_wday, tm);
3ca1e326 CZ	143
	144	return ret;
	145	}
	146
	147	/* Set current time and date in RTC */
	148	static int rk808_rtc_set_time(struct device dev, struct rtc_time tm)
	149	{
	150	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	151	struct rk808 *rk808 = rk808_rtc->rk808;
	152	u8 rtc_data[NUM_TIME_REGS];
	153	int ret;
	154
0991e754	155	dev_dbg(dev, "set RTC date/time %ptRd(%d) %ptRt\n", tm, tm->tm_wday, tm);
f076ef44	156	gregorian_to_rockchip(tm);
3ca1e326 CZ	157	rtc_data[0] = bin2bcd(tm->tm_sec);
	158	rtc_data[1] = bin2bcd(tm->tm_min);
	159	rtc_data[2] = bin2bcd(tm->tm_hour);
	160	rtc_data[3] = bin2bcd(tm->tm_mday);
	161	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	162	rtc_data[5] = bin2bcd(tm->tm_year - 100);
	163	rtc_data[6] = bin2bcd(tm->tm_wday);
3ca1e326 CZ	164
3ca1e326 CZ	165	/* Stop RTC while updating the RTC registers */
dc79054a	166	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
3ca1e326 CZ	167	BIT_RTC_CTRL_REG_STOP_RTC_M,
	168	BIT_RTC_CTRL_REG_STOP_RTC_M);
	169	if (ret) {
	170	dev_err(dev, "Failed to update RTC control: %d\n", ret);
	171	return ret;
	172	}
	173
dc79054a	174	ret = regmap_bulk_write(rk808->regmap, rk808_rtc->creg->seconds_reg,
3ca1e326 CZ	175	rtc_data, NUM_TIME_REGS);
	176	if (ret) {
	177	dev_err(dev, "Failed to bull write rtc_data: %d\n", ret);
	178	return ret;
	179	}
	180	/* Start RTC again */
dc79054a	181	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
3ca1e326 CZ	182	BIT_RTC_CTRL_REG_STOP_RTC_M, 0);
	183	if (ret) {
	184	dev_err(dev, "Failed to update RTC control: %d\n", ret);
	185	return ret;
	186	}
	187	return 0;
	188	}
	189
	190	/* Read alarm time and date in RTC */
	191	static int rk808_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	192	{
	193	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	194	struct rk808 *rk808 = rk808_rtc->rk808;
	195	u8 alrm_data[NUM_ALARM_REGS];
	196	uint32_t int_reg;
	197	int ret;
	198
dc79054a TX	199	ret = regmap_bulk_read(rk808->regmap,
dc79054a TX	200	rk808_rtc->creg->alarm_seconds_reg,
3ca1e326	201	alrm_data, NUM_ALARM_REGS);
dc79054a TX	202	if (ret) {
	203	dev_err(dev, "Failed to read RTC alarm date REG: %d\n", ret);
	204	return ret;
	205	}
3ca1e326 CZ	206
	207	alrm->time.tm_sec = bcd2bin(alrm_data[0] & SECONDS_REG_MSK);
	208	alrm->time.tm_min = bcd2bin(alrm_data[1] & MINUTES_REG_MAK);
	209	alrm->time.tm_hour = bcd2bin(alrm_data[2] & HOURS_REG_MSK);
	210	alrm->time.tm_mday = bcd2bin(alrm_data[3] & DAYS_REG_MSK);
	211	alrm->time.tm_mon = (bcd2bin(alrm_data[4] & MONTHS_REG_MSK)) - 1;
	212	alrm->time.tm_year = (bcd2bin(alrm_data[5] & YEARS_REG_MSK)) + 100;
f076ef44	213	rockchip_to_gregorian(&alrm->time);
3ca1e326	214
dc79054a	215	ret = regmap_read(rk808->regmap, rk808_rtc->creg->int_reg, &int_reg);
3ca1e326 CZ	216	if (ret) {
	217	dev_err(dev, "Failed to read RTC INT REG: %d\n", ret);
	218	return ret;
	219	}
	220
0991e754 AS	221	dev_dbg(dev, "alrm read RTC date/time %ptRd(%d) %ptRt\n",
0991e754 AS	222	&alrm->time, alrm->time.tm_wday, &alrm->time);
3ca1e326 CZ	223
	224	alrm->enabled = (int_reg & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M) ? 1 : 0;
	225
	226	return 0;
	227	}
	228
	229	static int rk808_rtc_stop_alarm(struct rk808_rtc *rk808_rtc)
	230	{
	231	struct rk808 *rk808 = rk808_rtc->rk808;
	232	int ret;
	233
dc79054a	234	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->int_reg,
3ca1e326 CZ	235	BIT_RTC_INTERRUPTS_REG_IT_ALARM_M, 0);
	236
	237	return ret;
	238	}
	239
	240	static int rk808_rtc_start_alarm(struct rk808_rtc *rk808_rtc)
	241	{
	242	struct rk808 *rk808 = rk808_rtc->rk808;
	243	int ret;
	244
dc79054a	245	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->int_reg,
3ca1e326 CZ	246	BIT_RTC_INTERRUPTS_REG_IT_ALARM_M,
	247	BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
	248
	249	return ret;
	250	}
	251
	252	static int rk808_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	253	{
	254	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	255	struct rk808 *rk808 = rk808_rtc->rk808;
	256	u8 alrm_data[NUM_ALARM_REGS];
	257	int ret;
	258
	259	ret = rk808_rtc_stop_alarm(rk808_rtc);
	260	if (ret) {
	261	dev_err(dev, "Failed to stop alarm: %d\n", ret);
	262	return ret;
	263	}
0991e754 AS	264	dev_dbg(dev, "alrm set RTC date/time %ptRd(%d) %ptRt\n",
0991e754 AS	265	&alrm->time, alrm->time.tm_wday, &alrm->time);
3ca1e326	266
f076ef44	267	gregorian_to_rockchip(&alrm->time);
3ca1e326 CZ	268	alrm_data[0] = bin2bcd(alrm->time.tm_sec);
	269	alrm_data[1] = bin2bcd(alrm->time.tm_min);
	270	alrm_data[2] = bin2bcd(alrm->time.tm_hour);
	271	alrm_data[3] = bin2bcd(alrm->time.tm_mday);
	272	alrm_data[4] = bin2bcd(alrm->time.tm_mon + 1);
	273	alrm_data[5] = bin2bcd(alrm->time.tm_year - 100);
	274
dc79054a TX	275	ret = regmap_bulk_write(rk808->regmap,
dc79054a TX	276	rk808_rtc->creg->alarm_seconds_reg,
3ca1e326 CZ	277	alrm_data, NUM_ALARM_REGS);
	278	if (ret) {
	279	dev_err(dev, "Failed to bulk write: %d\n", ret);
	280	return ret;
	281	}
	282	if (alrm->enabled) {
	283	ret = rk808_rtc_start_alarm(rk808_rtc);
	284	if (ret) {
	285	dev_err(dev, "Failed to start alarm: %d\n", ret);
	286	return ret;
	287	}
	288	}
	289	return 0;
	290	}
	291
	292	static int rk808_rtc_alarm_irq_enable(struct device *dev,
	293	unsigned int enabled)
	294	{
	295	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	296
	297	if (enabled)
	298	return rk808_rtc_start_alarm(rk808_rtc);
	299
	300	return rk808_rtc_stop_alarm(rk808_rtc);
	301	}
	302
	303	/*
	304	* We will just handle setting the frequency and make use the framework for
	305	* reading the periodic interupts.
	306	*
	307	* @freq: Current periodic IRQ freq:
	308	* bit 0: every second
	309	* bit 1: every minute
	310	* bit 2: every hour
	311	* bit 3: every day
	312	*/
	313	static irqreturn_t rk808_alarm_irq(int irq, void *data)
	314	{
	315	struct rk808_rtc *rk808_rtc = data;
	316	struct rk808 *rk808 = rk808_rtc->rk808;
	317	struct i2c_client *client = rk808->i2c;
	318	int ret;
	319
dc79054a	320	ret = regmap_write(rk808->regmap, rk808_rtc->creg->status_reg,
3ca1e326 CZ	321	RTC_STATUS_MASK);
	322	if (ret) {
	323	dev_err(&client->dev,
	324	"%s:Failed to update RTC status: %d\n", __func__, ret);
	325	return ret;
	326	}
	327
	328	rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	329	dev_dbg(&client->dev,
	330	"%s:irq=%d\n", __func__, irq);
	331	return IRQ_HANDLED;
	332	}
	333
	334	static const struct rtc_class_ops rk808_rtc_ops = {
	335	.read_time = rk808_rtc_readtime,
	336	.set_time = rk808_rtc_set_time,
	337	.read_alarm = rk808_rtc_readalarm,
	338	.set_alarm = rk808_rtc_setalarm,
	339	.alarm_irq_enable = rk808_rtc_alarm_irq_enable,
	340	};
	341
	342	#ifdef CONFIG_PM_SLEEP
	343	/* Turn off the alarm if it should not be a wake source. */
	344	static int rk808_rtc_suspend(struct device *dev)
	345	{
527bd754	346	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
3ca1e326 CZ	347
	348	if (device_may_wakeup(dev))
	349	enable_irq_wake(rk808_rtc->irq);
	350
	351	return 0;
	352	}
	353
	354	/* Enable the alarm if it should be enabled (in case it was disabled to
	355	* prevent use as a wake source).
	356	*/
	357	static int rk808_rtc_resume(struct device *dev)
	358	{
527bd754	359	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
3ca1e326 CZ	360
	361	if (device_may_wakeup(dev))
	362	disable_irq_wake(rk808_rtc->irq);
	363
	364	return 0;
	365	}
	366	#endif
	367
	368	static SIMPLE_DEV_PM_OPS(rk808_rtc_pm_ops,
	369	rk808_rtc_suspend, rk808_rtc_resume);
	370
dc79054a TX	371	static struct rk_rtc_compat_reg rk808_creg = {
	372	.ctrl_reg = RK808_RTC_CTRL_REG,
	373	.status_reg = RK808_RTC_STATUS_REG,
	374	.alarm_seconds_reg = RK808_ALARM_SECONDS_REG,
	375	.int_reg = RK808_RTC_INT_REG,
	376	.seconds_reg = RK808_SECONDS_REG,
	377	};
	378
	379	static struct rk_rtc_compat_reg rk817_creg = {
	380	.ctrl_reg = RK817_RTC_CTRL_REG,
	381	.status_reg = RK817_RTC_STATUS_REG,
	382	.alarm_seconds_reg = RK817_ALARM_SECONDS_REG,
	383	.int_reg = RK817_RTC_INT_REG,
	384	.seconds_reg = RK817_SECONDS_REG,
	385	};
	386
3ca1e326 CZ	387	static int rk808_rtc_probe(struct platform_device *pdev)
	388	{
	389	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	390	struct rk808_rtc *rk808_rtc;
3ca1e326 CZ	391	int ret;
	392
	393	rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL);
	394	if (rk808_rtc == NULL)
	395	return -ENOMEM;
	396
dc79054a TX	397	switch (rk808->variant) {
	398	case RK809_ID:
	399	case RK817_ID:
	400	rk808_rtc->creg = &rk817_creg;
	401	break;
	402	default:
	403	rk808_rtc->creg = &rk808_creg;
	404	break;
	405	}
3ca1e326 CZ	406	platform_set_drvdata(pdev, rk808_rtc);
	407	rk808_rtc->rk808 = rk808;
	408
	409	/* start rtc running by default, and use shadowed timer. */
dc79054a	410	ret = regmap_update_bits(rk808->regmap, rk808_rtc->creg->ctrl_reg,
3ca1e326 CZ	411	BIT_RTC_CTRL_REG_STOP_RTC_M \|
	412	BIT_RTC_CTRL_REG_RTC_READSEL_M,
	413	BIT_RTC_CTRL_REG_RTC_READSEL_M);
	414	if (ret) {
	415	dev_err(&pdev->dev,
	416	"Failed to update RTC control: %d\n", ret);
	417	return ret;
	418	}
	419
dc79054a	420	ret = regmap_write(rk808->regmap, rk808_rtc->creg->status_reg,
3ca1e326 CZ	421	RTC_STATUS_MASK);
	422	if (ret) {
	423	dev_err(&pdev->dev,
	424	"Failed to write RTC status: %d\n", ret);
725412d9	425	return ret;
3ca1e326 CZ	426	}
3ca1e326 CZ	427
3ca1e326 CZ	428	device_init_wakeup(&pdev->dev, 1);
3ca1e326 CZ	429
201fac95 AB	430	rk808_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
	431	if (IS_ERR(rk808_rtc->rtc))
	432	return PTR_ERR(rk808_rtc->rtc);
	433
	434	rk808_rtc->rtc->ops = &rk808_rtc_ops;
3ca1e326 CZ	435
3ca1e326 CZ	436	rk808_rtc->irq = platform_get_irq(pdev, 0);
faac9102	437	if (rk808_rtc->irq < 0)
3ca1e326	438	return rk808_rtc->irq;
3ca1e326 CZ	439
	440	/* request alarm irq of rk808 */
	441	ret = devm_request_threaded_irq(&pdev->dev, rk808_rtc->irq, NULL,
	442	rk808_alarm_irq, 0,
	443	"RTC alarm", rk808_rtc);
	444	if (ret) {
	445	dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
	446	rk808_rtc->irq, ret);
201fac95	447	return ret;
3ca1e326 CZ	448	}
3ca1e326 CZ	449
201fac95	450	return rtc_register_device(rk808_rtc->rtc);
3ca1e326 CZ	451	}
	452
	453	static struct platform_driver rk808_rtc_driver = {
	454	.probe = rk808_rtc_probe,
	455	.driver = {
	456	.name = "rk808-rtc",
	457	.pm = &rk808_rtc_pm_ops,
	458	},
	459	};
	460
	461	module_platform_driver(rk808_rtc_driver);
	462
	463	MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs");
	464	MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
	465	MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
	466	MODULE_LICENSE("GPL");
	467	MODULE_ALIAS("platform:rk808-rtc");