[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 rk808_rtc {
	struct rk808 *rk808;
	struct rtc_device *rtc;
	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_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_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_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_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_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_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_ALARM_SECONDS_REG,
			       alrm_data, NUM_ALARM_REGS);

	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_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_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_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_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_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 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;

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