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

/*
 * RTC driver for Rockchip RK808
 *
 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author: Chris Zhong <[email protected]>
 * Author: Zhang Qing <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#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 %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);

	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 %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
		tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
	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 %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
		alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
		alrm->time.tm_min, alrm->time.tm_sec);

	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 %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
		1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
		alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
		alrm->time.tm_min, alrm->time.tm_sec);

	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 platform_device *pdev = to_platform_device(dev);
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->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 platform_device *pdev = to_platform_device(dev);
	struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->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 <[email protected]>");
MODULE_AUTHOR("Zhang Qing <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-rtc");
Commit	Line	Data
3ca1e326 CZ	1	/*
	2	* RTC driver for Rockchip RK808
	3	*
	4	* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
	5	*
	6	* Author: Chris Zhong <[email protected]>
	7	* Author: Zhang Qing <[email protected]>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms and conditions of the GNU General Public License,
	11	* version 2, as published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope it will be useful, but WITHOUT
	14	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	15	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	16	* more details.
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/kernel.h>
	21	#include <linux/rtc.h>
	22	#include <linux/bcd.h>
	23	#include <linux/mfd/rk808.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/i2c.h>
	26
	27	/* RTC_CTRL_REG bitfields */
	28	#define BIT_RTC_CTRL_REG_STOP_RTC_M BIT(0)
	29
	30	/* RK808 has a shadowed register for saving a "frozen" RTC time.
	31	* When user setting "GET_TIME" to 1, the time will save in this shadowed
	32	* register. If set "READSEL" to 1, user read rtc time register, actually
	33	* get the time of that moment. If we need the real time, clr this bit.
	34	*/
	35	#define BIT_RTC_CTRL_REG_RTC_GET_TIME BIT(6)
	36	#define BIT_RTC_CTRL_REG_RTC_READSEL_M BIT(7)
	37	#define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M BIT(3)
	38	#define RTC_STATUS_MASK 0xFE
	39
	40	#define SECONDS_REG_MSK 0x7F
	41	#define MINUTES_REG_MAK 0x7F
	42	#define HOURS_REG_MSK 0x3F
	43	#define DAYS_REG_MSK 0x3F
	44	#define MONTHS_REG_MSK 0x1F
	45	#define YEARS_REG_MSK 0xFF
	46	#define WEEKS_REG_MSK 0x7
	47
	48	/* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
	49
	50	#define NUM_TIME_REGS (RK808_WEEKS_REG - RK808_SECONDS_REG + 1)
	51	#define NUM_ALARM_REGS (RK808_ALARM_YEARS_REG - RK808_ALARM_SECONDS_REG + 1)
	52
	53	struct rk808_rtc {
	54	struct rk808 *rk808;
	55	struct rtc_device *rtc;
	56	int irq;
	57	};
	58
f076ef44 JW	59	/*
	60	* The Rockchip calendar used by the RK808 counts November with 31 days. We use
	61	* these translation functions to convert its dates to/from the Gregorian
	62	* calendar used by the rest of the world. We arbitrarily define Jan 1st, 2016
	63	* as the day when both calendars were in sync, and treat all other dates
	64	* relative to that.
	65	* NOTE: Other system software (e.g. firmware) that reads the same hardware must
	66	* implement this exact same conversion algorithm, with the same anchor date.
	67	*/
	68	static time64_t nov2dec_transitions(struct rtc_time *tm)
	69	{
	70	return (tm->tm_year + 1900) - 2016 + (tm->tm_mon + 1 > 11 ? 1 : 0);
	71	}
	72
	73	static void rockchip_to_gregorian(struct rtc_time *tm)
	74	{
	75	/* If it's Nov 31st, rtc_tm_to_time64() will count that like Dec 1st */
	76	time64_t time = rtc_tm_to_time64(tm);
	77	rtc_time64_to_tm(time + nov2dec_transitions(tm) * 86400, tm);
	78	}
	79
	80	static void gregorian_to_rockchip(struct rtc_time *tm)
	81	{
	82	time64_t extra_days = nov2dec_transitions(tm);
	83	time64_t time = rtc_tm_to_time64(tm);
	84	rtc_time64_to_tm(time - extra_days * 86400, tm);
	85
	86	/* Compensate if we went back over Nov 31st (will work up to 2381) */
	87	if (nov2dec_transitions(tm) < extra_days) {
	88	if (tm->tm_mon + 1 == 11)
	89	tm->tm_mday++; /* This may result in 31! */
	90	else
	91	rtc_time64_to_tm(time - (extra_days - 1) * 86400, tm);
	92	}
	93	}
	94
3ca1e326 CZ	95	/* Read current time and date in RTC */
	96	static int rk808_rtc_readtime(struct device dev, struct rtc_time tm)
	97	{
	98	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	99	struct rk808 *rk808 = rk808_rtc->rk808;
	100	u8 rtc_data[NUM_TIME_REGS];
	101	int ret;
	102
	103	/* Force an update of the shadowed registers right now */
	104	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
	105	BIT_RTC_CTRL_REG_RTC_GET_TIME,
c412c603	106	BIT_RTC_CTRL_REG_RTC_GET_TIME);
3ca1e326 CZ	107	if (ret) {
	108	dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
	109	return ret;
	110	}
	111
c412c603 CZ	112	/*
	113	* After we set the GET_TIME bit, the rtc time can't be read
	114	* immediately. So we should wait up to 31.25 us, about one cycle of
	115	* 32khz. If we clear the GET_TIME bit here, the time of i2c transfer
	116	* certainly more than 31.25us: 16 * 2.5us at 400kHz bus frequency.
	117	*/
3ca1e326 CZ	118	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
3ca1e326 CZ	119	BIT_RTC_CTRL_REG_RTC_GET_TIME,
c412c603	120	0);
3ca1e326 CZ	121	if (ret) {
	122	dev_err(dev, "Failed to update bits rtc_ctrl: %d\n", ret);
	123	return ret;
	124	}
	125
	126	ret = regmap_bulk_read(rk808->regmap, RK808_SECONDS_REG,
	127	rtc_data, NUM_TIME_REGS);
	128	if (ret) {
	129	dev_err(dev, "Failed to bulk read rtc_data: %d\n", ret);
	130	return ret;
	131	}
	132
	133	tm->tm_sec = bcd2bin(rtc_data[0] & SECONDS_REG_MSK);
	134	tm->tm_min = bcd2bin(rtc_data[1] & MINUTES_REG_MAK);
	135	tm->tm_hour = bcd2bin(rtc_data[2] & HOURS_REG_MSK);
	136	tm->tm_mday = bcd2bin(rtc_data[3] & DAYS_REG_MSK);
	137	tm->tm_mon = (bcd2bin(rtc_data[4] & MONTHS_REG_MSK)) - 1;
	138	tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 100;
	139	tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK);
f076ef44	140	rockchip_to_gregorian(tm);
3ca1e326 CZ	141	dev_dbg(dev, "RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
3ca1e326 CZ	142	1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
f076ef44	143	tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
3ca1e326 CZ	144
	145	return ret;
	146	}
	147
	148	/* Set current time and date in RTC */
	149	static int rk808_rtc_set_time(struct device dev, struct rtc_time tm)
	150	{
	151	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	152	struct rk808 *rk808 = rk808_rtc->rk808;
	153	u8 rtc_data[NUM_TIME_REGS];
	154	int ret;
	155
f076ef44 JW	156	dev_dbg(dev, "set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
	157	1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
	158	tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
	159	gregorian_to_rockchip(tm);
3ca1e326 CZ	160	rtc_data[0] = bin2bcd(tm->tm_sec);
	161	rtc_data[1] = bin2bcd(tm->tm_min);
	162	rtc_data[2] = bin2bcd(tm->tm_hour);
	163	rtc_data[3] = bin2bcd(tm->tm_mday);
	164	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	165	rtc_data[5] = bin2bcd(tm->tm_year - 100);
	166	rtc_data[6] = bin2bcd(tm->tm_wday);
3ca1e326 CZ	167
	168	/* Stop RTC while updating the RTC registers */
	169	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
	170	BIT_RTC_CTRL_REG_STOP_RTC_M,
	171	BIT_RTC_CTRL_REG_STOP_RTC_M);
	172	if (ret) {
	173	dev_err(dev, "Failed to update RTC control: %d\n", ret);
	174	return ret;
	175	}
	176
	177	ret = regmap_bulk_write(rk808->regmap, RK808_SECONDS_REG,
	178	rtc_data, NUM_TIME_REGS);
	179	if (ret) {
	180	dev_err(dev, "Failed to bull write rtc_data: %d\n", ret);
	181	return ret;
	182	}
	183	/* Start RTC again */
	184	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
	185	BIT_RTC_CTRL_REG_STOP_RTC_M, 0);
	186	if (ret) {
	187	dev_err(dev, "Failed to update RTC control: %d\n", ret);
	188	return ret;
	189	}
	190	return 0;
	191	}
	192
	193	/* Read alarm time and date in RTC */
	194	static int rk808_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	195	{
	196	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	197	struct rk808 *rk808 = rk808_rtc->rk808;
	198	u8 alrm_data[NUM_ALARM_REGS];
	199	uint32_t int_reg;
	200	int ret;
	201
	202	ret = regmap_bulk_read(rk808->regmap, RK808_ALARM_SECONDS_REG,
	203	alrm_data, NUM_ALARM_REGS);
	204
	205	alrm->time.tm_sec = bcd2bin(alrm_data[0] & SECONDS_REG_MSK);
	206	alrm->time.tm_min = bcd2bin(alrm_data[1] & MINUTES_REG_MAK);
	207	alrm->time.tm_hour = bcd2bin(alrm_data[2] & HOURS_REG_MSK);
	208	alrm->time.tm_mday = bcd2bin(alrm_data[3] & DAYS_REG_MSK);
	209	alrm->time.tm_mon = (bcd2bin(alrm_data[4] & MONTHS_REG_MSK)) - 1;
	210	alrm->time.tm_year = (bcd2bin(alrm_data[5] & YEARS_REG_MSK)) + 100;
f076ef44	211	rockchip_to_gregorian(&alrm->time);
3ca1e326 CZ	212
	213	ret = regmap_read(rk808->regmap, RK808_RTC_INT_REG, &int_reg);
	214	if (ret) {
	215	dev_err(dev, "Failed to read RTC INT REG: %d\n", ret);
	216	return ret;
	217	}
	218
	219	dev_dbg(dev, "alrm read RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
	220	1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
	221	alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
	222	alrm->time.tm_min, alrm->time.tm_sec);
	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
	234	ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
	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
	245	ret = regmap_update_bits(rk808->regmap, RK808_RTC_INT_REG,
	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	}
	264	dev_dbg(dev, "alrm set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
	265	1900 + alrm->time.tm_year, alrm->time.tm_mon + 1,
	266	alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
	267	alrm->time.tm_min, alrm->time.tm_sec);
	268
f076ef44	269	gregorian_to_rockchip(&alrm->time);
3ca1e326 CZ	270	alrm_data[0] = bin2bcd(alrm->time.tm_sec);
	271	alrm_data[1] = bin2bcd(alrm->time.tm_min);
	272	alrm_data[2] = bin2bcd(alrm->time.tm_hour);
	273	alrm_data[3] = bin2bcd(alrm->time.tm_mday);
	274	alrm_data[4] = bin2bcd(alrm->time.tm_mon + 1);
	275	alrm_data[5] = bin2bcd(alrm->time.tm_year - 100);
	276
	277	ret = regmap_bulk_write(rk808->regmap, RK808_ALARM_SECONDS_REG,
	278	alrm_data, NUM_ALARM_REGS);
	279	if (ret) {
	280	dev_err(dev, "Failed to bulk write: %d\n", ret);
	281	return ret;
	282	}
	283	if (alrm->enabled) {
	284	ret = rk808_rtc_start_alarm(rk808_rtc);
	285	if (ret) {
	286	dev_err(dev, "Failed to start alarm: %d\n", ret);
	287	return ret;
	288	}
	289	}
	290	return 0;
	291	}
	292
	293	static int rk808_rtc_alarm_irq_enable(struct device *dev,
	294	unsigned int enabled)
	295	{
	296	struct rk808_rtc *rk808_rtc = dev_get_drvdata(dev);
	297
	298	if (enabled)
	299	return rk808_rtc_start_alarm(rk808_rtc);
	300
	301	return rk808_rtc_stop_alarm(rk808_rtc);
	302	}
	303
	304	/*
	305	* We will just handle setting the frequency and make use the framework for
	306	* reading the periodic interupts.
	307	*
	308	* @freq: Current periodic IRQ freq:
	309	* bit 0: every second
	310	* bit 1: every minute
	311	* bit 2: every hour
	312	* bit 3: every day
	313	*/
	314	static irqreturn_t rk808_alarm_irq(int irq, void *data)
	315	{
	316	struct rk808_rtc *rk808_rtc = data;
	317	struct rk808 *rk808 = rk808_rtc->rk808;
	318	struct i2c_client *client = rk808->i2c;
	319	int ret;
	320
	321	ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG,
	322	RTC_STATUS_MASK);
	323	if (ret) {
	324	dev_err(&client->dev,
	325	"%s:Failed to update RTC status: %d\n", __func__, ret);
	326	return ret;
	327	}
	328
	329	rtc_update_irq(rk808_rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	330	dev_dbg(&client->dev,
	331	"%s:irq=%d\n", __func__, irq);
	332	return IRQ_HANDLED;
	333	}
334
335	static const struct rtc_class_ops rk808_rtc_ops = {
336	.read_time = rk808_rtc_readtime,
337	.set_time = rk808_rtc_set_time,
338	.read_alarm = rk808_rtc_readalarm,
339	.set_alarm = rk808_rtc_setalarm,
340	.alarm_irq_enable = rk808_rtc_alarm_irq_enable,
341	};
342
343	#ifdef CONFIG_PM_SLEEP
344	/* Turn off the alarm if it should not be a wake source. */
345	static int rk808_rtc_suspend(struct device *dev)
346	{
347	struct platform_device *pdev = to_platform_device(dev);
348	struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);
349
350	if (device_may_wakeup(dev))
351	enable_irq_wake(rk808_rtc->irq);
352
353	return 0;
354	}
355
356	/* Enable the alarm if it should be enabled (in case it was disabled to
357	* prevent use as a wake source).
358	*/
359	static int rk808_rtc_resume(struct device *dev)
360	{
361	struct platform_device *pdev = to_platform_device(dev);
362	struct rk808_rtc *rk808_rtc = dev_get_drvdata(&pdev->dev);
363
364	if (device_may_wakeup(dev))
365	disable_irq_wake(rk808_rtc->irq);
366
367	return 0;
368	}
369	#endif
370
371	static SIMPLE_DEV_PM_OPS(rk808_rtc_pm_ops,
372	rk808_rtc_suspend, rk808_rtc_resume);
373
374	static int rk808_rtc_probe(struct platform_device *pdev)
375	{
376	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
377	struct rk808_rtc *rk808_rtc;
3ca1e326 CZ	378	int ret;
	379
	380	rk808_rtc = devm_kzalloc(&pdev->dev, sizeof(*rk808_rtc), GFP_KERNEL);
	381	if (rk808_rtc == NULL)
	382	return -ENOMEM;
	383
	384	platform_set_drvdata(pdev, rk808_rtc);
	385	rk808_rtc->rk808 = rk808;
	386
	387	/* start rtc running by default, and use shadowed timer. */
	388	ret = regmap_update_bits(rk808->regmap, RK808_RTC_CTRL_REG,
	389	BIT_RTC_CTRL_REG_STOP_RTC_M \|
	390	BIT_RTC_CTRL_REG_RTC_READSEL_M,
	391	BIT_RTC_CTRL_REG_RTC_READSEL_M);
	392	if (ret) {
	393	dev_err(&pdev->dev,
	394	"Failed to update RTC control: %d\n", ret);
	395	return ret;
	396	}
	397
	398	ret = regmap_write(rk808->regmap, RK808_RTC_STATUS_REG,
	399	RTC_STATUS_MASK);
	400	if (ret) {
	401	dev_err(&pdev->dev,
	402	"Failed to write RTC status: %d\n", ret);
	403	return ret;
	404	}
	405
3ca1e326 CZ	406	device_init_wakeup(&pdev->dev, 1);
3ca1e326 CZ	407
201fac95 AB	408	rk808_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
	409	if (IS_ERR(rk808_rtc->rtc))
	410	return PTR_ERR(rk808_rtc->rtc);
	411
	412	rk808_rtc->rtc->ops = &rk808_rtc_ops;
3ca1e326 CZ	413
	414	rk808_rtc->irq = platform_get_irq(pdev, 0);
	415	if (rk808_rtc->irq < 0) {
	416	if (rk808_rtc->irq != -EPROBE_DEFER)
	417	dev_err(&pdev->dev, "Wake up is not possible as irq = %d\n",
	418	rk808_rtc->irq);
	419	return rk808_rtc->irq;
	420	}
	421
	422	/* request alarm irq of rk808 */
	423	ret = devm_request_threaded_irq(&pdev->dev, rk808_rtc->irq, NULL,
	424	rk808_alarm_irq, 0,
	425	"RTC alarm", rk808_rtc);
	426	if (ret) {
	427	dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
	428	rk808_rtc->irq, ret);
201fac95	429	return ret;
3ca1e326 CZ	430	}
3ca1e326 CZ	431
201fac95	432	return rtc_register_device(rk808_rtc->rtc);
3ca1e326 CZ	433	}
	434
	435	static struct platform_driver rk808_rtc_driver = {
	436	.probe = rk808_rtc_probe,
	437	.driver = {
	438	.name = "rk808-rtc",
	439	.pm = &rk808_rtc_pm_ops,
	440	},
	441	};
	442
	443	module_platform_driver(rk808_rtc_driver);
	444
	445	MODULE_DESCRIPTION("RTC driver for the rk808 series PMICs");
	446	MODULE_AUTHOR("Chris Zhong <[email protected]>");
	447	MODULE_AUTHOR("Zhang Qing <[email protected]>");
	448	MODULE_LICENSE("GPL");
	449	MODULE_ALIAS("platform:rk808-rtc");