[linux-block.git] / drivers / rtc / rtc-tps65910.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * rtc-tps65910.c -- TPS65910 Real Time Clock interface
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 * Author: Venu Byravarasu <vbyravarasu@nvidia.com>
 *
 * Based on original TI driver rtc-twl.c
 *   Copyright (C) 2007 MontaVista Software, Inc
 *   Author: Alexandre Rusev <source@mvista.com>
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/math64.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/mfd/tps65910.h>

struct tps65910_rtc {
	struct rtc_device	*rtc;
	int irq;
};

/* Total number of RTC registers needed to set time*/
#define NUM_TIME_REGS	(TPS65910_YEARS - TPS65910_SECONDS + 1)

/* Total number of RTC registers needed to set compensation registers */
#define NUM_COMP_REGS	(TPS65910_RTC_COMP_MSB - TPS65910_RTC_COMP_LSB + 1)

/* Min and max values supported with 'offset' interface (swapped sign) */
#define MIN_OFFSET	(-277761)
#define MAX_OFFSET	(277778)

/* Number of ticks per hour */
#define TICKS_PER_HOUR	(32768 * 3600)

/* Multiplier for ppb conversions */
#define PPB_MULT	(1000000000LL)

static int tps65910_rtc_alarm_irq_enable(struct device *dev,
					 unsigned int enabled)
{
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	u8 val = 0;

	if (enabled)
		val = TPS65910_RTC_INTERRUPTS_IT_ALARM;

	return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val);
}

/*
 * Gets current tps65910 RTC time and date parameters.
 *
 * The RTC's time/alarm representation is not what gmtime(3) requires
 * Linux to use:
 *
 *  - Months are 1..12 vs Linux 0-11
 *  - Years are 0..99 vs Linux 1900..N (we assume 21st century)
 */
static int tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	unsigned char rtc_data[NUM_TIME_REGS];
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	int ret;

	/* Copy RTC counting registers to static registers or latches */
	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
		TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME);
	if (ret < 0) {
		dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret);
		return ret;
	}

	ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data,
		NUM_TIME_REGS);
	if (ret < 0) {
		dev_err(dev, "reading from RTC failed with err:%d\n", ret);
		return ret;
	}

	tm->tm_sec = bcd2bin(rtc_data[0]);
	tm->tm_min = bcd2bin(rtc_data[1]);
	tm->tm_hour = bcd2bin(rtc_data[2]);
	tm->tm_mday = bcd2bin(rtc_data[3]);
	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
	tm->tm_year = bcd2bin(rtc_data[5]) + 100;

	return ret;
}

static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	unsigned char rtc_data[NUM_TIME_REGS];
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	int ret;

	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);

	/* Stop RTC while updating the RTC time registers */
	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
		TPS65910_RTC_CTRL_STOP_RTC, 0);
	if (ret < 0) {
		dev_err(dev, "RTC stop failed with err:%d\n", ret);
		return ret;
	}

	/* update all the time registers in one shot */
	ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data,
		NUM_TIME_REGS);
	if (ret < 0) {
		dev_err(dev, "rtc_set_time error %d\n", ret);
		return ret;
	}

	/* Start back RTC */
	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
		TPS65910_RTC_CTRL_STOP_RTC, 1);
	if (ret < 0)
		dev_err(dev, "RTC start failed with err:%d\n", ret);

	return ret;
}

/*
 * Gets current tps65910 RTC alarm time.
 */
static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	unsigned char alarm_data[NUM_TIME_REGS];
	u32 int_val;
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	int ret;

	ret = regmap_bulk_read(tps->regmap, TPS65910_ALARM_SECONDS, alarm_data,
		NUM_TIME_REGS);
	if (ret < 0) {
		dev_err(dev, "rtc_read_alarm error %d\n", ret);
		return ret;
	}

	alm->time.tm_sec = bcd2bin(alarm_data[0]);
	alm->time.tm_min = bcd2bin(alarm_data[1]);
	alm->time.tm_hour = bcd2bin(alarm_data[2]);
	alm->time.tm_mday = bcd2bin(alarm_data[3]);
	alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
	alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;

	ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val);
	if (ret < 0)
		return ret;

	if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM)
		alm->enabled = 1;

	return ret;
}

static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	unsigned char alarm_data[NUM_TIME_REGS];
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	int ret;

	ret = tps65910_rtc_alarm_irq_enable(dev, 0);
	if (ret)
		return ret;

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

	/* update all the alarm registers in one shot */
	ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS,
		alarm_data, NUM_TIME_REGS);
	if (ret) {
		dev_err(dev, "rtc_set_alarm error %d\n", ret);
		return ret;
	}

	if (alm->enabled)
		ret = tps65910_rtc_alarm_irq_enable(dev, 1);

	return ret;
}

static int tps65910_rtc_set_calibration(struct device *dev, int calibration)
{
	unsigned char comp_data[NUM_COMP_REGS];
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	s16 value;
	int ret;

	/*
	 * TPS65910 uses two's complement 16 bit value for compensation for RTC
	 * crystal inaccuracies. One time every hour when seconds counter
	 * increments from 0 to 1 compensation value will be added to internal
	 * RTC counter value.
	 *
	 * Compensation value 0x7FFF is prohibited value.
	 *
	 * Valid range for compensation value: [-32768 .. 32766]
	 */
	if ((calibration < -32768) || (calibration > 32766)) {
		dev_err(dev, "RTC calibration value out of range: %d\n",
			calibration);
		return -EINVAL;
	}

	value = (s16)calibration;

	comp_data[0] = (u16)value & 0xFF;
	comp_data[1] = ((u16)value >> 8) & 0xFF;

	/* Update all the compensation registers in one shot */
	ret = regmap_bulk_write(tps->regmap, TPS65910_RTC_COMP_LSB,
		comp_data, NUM_COMP_REGS);
	if (ret < 0) {
		dev_err(dev, "rtc_set_calibration error: %d\n", ret);
		return ret;
	}

	/* Enable automatic compensation */
	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
		TPS65910_RTC_CTRL_AUTO_COMP, TPS65910_RTC_CTRL_AUTO_COMP);
	if (ret < 0)
		dev_err(dev, "auto_comp enable failed with error: %d\n", ret);

	return ret;
}

static int tps65910_rtc_get_calibration(struct device *dev, int *calibration)
{
	unsigned char comp_data[NUM_COMP_REGS];
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	unsigned int ctrl;
	u16 value;
	int ret;

	ret = regmap_read(tps->regmap, TPS65910_RTC_CTRL, &ctrl);
	if (ret < 0)
		return ret;

	/* If automatic compensation is not enabled report back zero */
	if (!(ctrl & TPS65910_RTC_CTRL_AUTO_COMP)) {
		*calibration = 0;
		return 0;
	}

	ret = regmap_bulk_read(tps->regmap, TPS65910_RTC_COMP_LSB, comp_data,
		NUM_COMP_REGS);
	if (ret < 0) {
		dev_err(dev, "rtc_get_calibration error: %d\n", ret);
		return ret;
	}

	value = (u16)comp_data[0] | ((u16)comp_data[1] << 8);

	*calibration = (s16)value;

	return 0;
}

static int tps65910_read_offset(struct device *dev, long *offset)
{
	int calibration;
	s64 tmp;
	int ret;

	ret = tps65910_rtc_get_calibration(dev, &calibration);
	if (ret < 0)
		return ret;

	/* Convert from RTC calibration register format to ppb format */
	tmp = calibration * (s64)PPB_MULT;
	if (tmp < 0)
		tmp -= TICKS_PER_HOUR / 2LL;
	else
		tmp += TICKS_PER_HOUR / 2LL;
	tmp = div_s64(tmp, TICKS_PER_HOUR);

	/* Offset value operates in negative way, so swap sign */
	*offset = (long)-tmp;

	return 0;
}

static int tps65910_set_offset(struct device *dev, long offset)
{
	int calibration;
	s64 tmp;
	int ret;

	/* Make sure offset value is within supported range */
	if (offset < MIN_OFFSET || offset > MAX_OFFSET)
		return -ERANGE;

	/* Convert from ppb format to RTC calibration register format */
	tmp = offset * (s64)TICKS_PER_HOUR;
	if (tmp < 0)
		tmp -= PPB_MULT / 2LL;
	else
		tmp += PPB_MULT / 2LL;
	tmp = div_s64(tmp, PPB_MULT);

	/* Offset value operates in negative way, so swap sign */
	calibration = (int)-tmp;

	ret = tps65910_rtc_set_calibration(dev, calibration);

	return ret;
}

static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc)
{
	struct device *dev = rtc;
	unsigned long events = 0;
	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
	int ret;
	u32 rtc_reg;

	ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg);
	if (ret)
		return IRQ_NONE;

	if (rtc_reg & TPS65910_RTC_STATUS_ALARM)
		events = RTC_IRQF | RTC_AF;

	ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg);
	if (ret)
		return IRQ_NONE;

	/* Notify RTC core on event */
	rtc_update_irq(tps_rtc->rtc, 1, events);

	return IRQ_HANDLED;
}

static const struct rtc_class_ops tps65910_rtc_ops = {
	.read_time	= tps65910_rtc_read_time,
	.set_time	= tps65910_rtc_set_time,
	.read_alarm	= tps65910_rtc_read_alarm,
	.set_alarm	= tps65910_rtc_set_alarm,
	.alarm_irq_enable = tps65910_rtc_alarm_irq_enable,
	.read_offset	= tps65910_read_offset,
	.set_offset	= tps65910_set_offset,
};

static const struct rtc_class_ops tps65910_rtc_ops_noirq = {
	.read_time	= tps65910_rtc_read_time,
	.set_time	= tps65910_rtc_set_time,
	.read_offset	= tps65910_read_offset,
	.set_offset	= tps65910_set_offset,
};

static int tps65910_rtc_probe(struct platform_device *pdev)
{
	struct tps65910 *tps65910 = NULL;
	struct tps65910_rtc *tps_rtc = NULL;
	int ret;
	int irq;
	u32 rtc_reg;

	tps65910 = dev_get_drvdata(pdev->dev.parent);

	tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc),
			GFP_KERNEL);
	if (!tps_rtc)
		return -ENOMEM;

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

	/* Clear pending interrupts */
	ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
	if (ret < 0)
		return ret;

	ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg);
	if (ret < 0)
		return ret;

	dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");

	/* Enable RTC digital power domain */
	ret = regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL,
		DEVCTRL_RTC_PWDN_MASK, 0 << DEVCTRL_RTC_PWDN_SHIFT);
	if (ret < 0)
		return ret;

	rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
	ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
	if (ret < 0)
		return ret;

	platform_set_drvdata(pdev, tps_rtc);

	irq  = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
			irq);
		return -ENXIO;
	}

	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
		tps65910_rtc_interrupt, IRQF_TRIGGER_LOW,
		dev_name(&pdev->dev), &pdev->dev);
	if (ret < 0)
		irq = -1;

	tps_rtc->irq = irq;
	if (irq != -1) {
		device_set_wakeup_capable(&pdev->dev, 1);
		tps_rtc->rtc->ops = &tps65910_rtc_ops;
	} else
		tps_rtc->rtc->ops = &tps65910_rtc_ops_noirq;

	tps_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	tps_rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;

	return rtc_register_device(tps_rtc->rtc);
}

#ifdef CONFIG_PM_SLEEP
static int tps65910_rtc_suspend(struct device *dev)
{
	struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(tps_rtc->irq);
	return 0;
}

static int tps65910_rtc_resume(struct device *dev)
{
	struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(tps_rtc->irq);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(tps65910_rtc_pm_ops, tps65910_rtc_suspend,
			tps65910_rtc_resume);

static struct platform_driver tps65910_rtc_driver = {
	.probe		= tps65910_rtc_probe,
	.driver		= {
		.name	= "tps65910-rtc",
		.pm	= &tps65910_rtc_pm_ops,
	},
};

module_platform_driver(tps65910_rtc_driver);
MODULE_ALIAS("platform:rtc-tps65910");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
0e783980 VB	2	/*
	3	* rtc-tps65910.c -- TPS65910 Real Time Clock interface
	4	*
	5	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	6	* Author: Venu Byravarasu <vbyravarasu@nvidia.com>
	7	*
	8	* Based on original TI driver rtc-twl.c
	9	* Copyright (C) 2007 MontaVista Software, Inc
	10	* Author: Alexandre Rusev <source@mvista.com>
0e783980 VB	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/errno.h>
	15	#include <linux/init.h>
	16	#include <linux/module.h>
	17	#include <linux/types.h>
	18	#include <linux/rtc.h>
	19	#include <linux/bcd.h>
aecb57da	20	#include <linux/math64.h>
0e783980 VB	21	#include <linux/platform_device.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/mfd/tps65910.h>
	24
	25	struct tps65910_rtc {
	26	struct rtc_device *rtc;
eb5eba4e	27	int irq;
0e783980 VB	28	};
	29
	30	/* Total number of RTC registers needed to set time*/
	31	#define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1)
	32
aecb57da VJ	33	/* Total number of RTC registers needed to set compensation registers */
	34	#define NUM_COMP_REGS (TPS65910_RTC_COMP_MSB - TPS65910_RTC_COMP_LSB + 1)
	35
	36	/* Min and max values supported with 'offset' interface (swapped sign) */
	37	#define MIN_OFFSET (-277761)
	38	#define MAX_OFFSET (277778)
	39
	40	/* Number of ticks per hour */
	41	#define TICKS_PER_HOUR (32768 * 3600)
	42
	43	/* Multiplier for ppb conversions */
	44	#define PPB_MULT (1000000000LL)
	45
e3dcb749 VJ	46	static int tps65910_rtc_alarm_irq_enable(struct device *dev,
e3dcb749 VJ	47	unsigned int enabled)
0e783980 VB	48	{
	49	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	50	u8 val = 0;
	51
	52	if (enabled)
	53	val = TPS65910_RTC_INTERRUPTS_IT_ALARM;
	54
	55	return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val);
	56	}
	57
	58	/*
	59	* Gets current tps65910 RTC time and date parameters.
	60	*
	61	* The RTC's time/alarm representation is not what gmtime(3) requires
	62	* Linux to use:
	63	*
	64	* - Months are 1..12 vs Linux 0-11
	65	* - Years are 0..99 vs Linux 1900..N (we assume 21st century)
	66	*/
	67	static int tps65910_rtc_read_time(struct device dev, struct rtc_time tm)
	68	{
	69	unsigned char rtc_data[NUM_TIME_REGS];
	70	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	71	int ret;
	72
	73	/* Copy RTC counting registers to static registers or latches */
	74	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
	75	TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME);
	76	if (ret < 0) {
	77	dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret);
	78	return ret;
	79	}
	80
	81	ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data,
	82	NUM_TIME_REGS);
	83	if (ret < 0) {
	84	dev_err(dev, "reading from RTC failed with err:%d\n", ret);
	85	return ret;
	86	}
	87
	88	tm->tm_sec = bcd2bin(rtc_data[0]);
	89	tm->tm_min = bcd2bin(rtc_data[1]);
	90	tm->tm_hour = bcd2bin(rtc_data[2]);
	91	tm->tm_mday = bcd2bin(rtc_data[3]);
	92	tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
	93	tm->tm_year = bcd2bin(rtc_data[5]) + 100;
	94
	95	return ret;
	96	}
	97
	98	static int tps65910_rtc_set_time(struct device dev, struct rtc_time tm)
	99	{
	100	unsigned char rtc_data[NUM_TIME_REGS];
	101	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	102	int ret;
	103
	104	rtc_data[0] = bin2bcd(tm->tm_sec);
	105	rtc_data[1] = bin2bcd(tm->tm_min);
	106	rtc_data[2] = bin2bcd(tm->tm_hour);
	107	rtc_data[3] = bin2bcd(tm->tm_mday);
	108	rtc_data[4] = bin2bcd(tm->tm_mon + 1);
	109	rtc_data[5] = bin2bcd(tm->tm_year - 100);
	110
	111	/* Stop RTC while updating the RTC time registers */
112	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
113	TPS65910_RTC_CTRL_STOP_RTC, 0);
114	if (ret < 0) {
115	dev_err(dev, "RTC stop failed with err:%d\n", ret);
116	return ret;
117	}
118
119	/* update all the time registers in one shot */
120	ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data,
121	NUM_TIME_REGS);
122	if (ret < 0) {
123	dev_err(dev, "rtc_set_time error %d\n", ret);
124	return ret;
125	}
126
127	/* Start back RTC */
128	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
129	TPS65910_RTC_CTRL_STOP_RTC, 1);
130	if (ret < 0)
131	dev_err(dev, "RTC start failed with err:%d\n", ret);
132
133	return ret;
134	}
135
136	/*
137	* Gets current tps65910 RTC alarm time.
138	*/
139	static int tps65910_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
140	{
141	unsigned char alarm_data[NUM_TIME_REGS];
142	u32 int_val;
143	struct tps65910 *tps = dev_get_drvdata(dev->parent);
144	int ret;
145
42ca37ca	146	ret = regmap_bulk_read(tps->regmap, TPS65910_ALARM_SECONDS, alarm_data,
0e783980 VB	147	NUM_TIME_REGS);
	148	if (ret < 0) {
	149	dev_err(dev, "rtc_read_alarm error %d\n", ret);
	150	return ret;
	151	}
	152
	153	alm->time.tm_sec = bcd2bin(alarm_data[0]);
	154	alm->time.tm_min = bcd2bin(alarm_data[1]);
	155	alm->time.tm_hour = bcd2bin(alarm_data[2]);
	156	alm->time.tm_mday = bcd2bin(alarm_data[3]);
	157	alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1;
	158	alm->time.tm_year = bcd2bin(alarm_data[5]) + 100;
	159
	160	ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val);
	161	if (ret < 0)
	162	return ret;
	163
	164	if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM)
	165	alm->enabled = 1;
	166
	167	return ret;
	168	}
	169
	170	static int tps65910_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	171	{
	172	unsigned char alarm_data[NUM_TIME_REGS];
	173	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	174	int ret;
	175
	176	ret = tps65910_rtc_alarm_irq_enable(dev, 0);
	177	if (ret)
	178	return ret;
	179
	180	alarm_data[0] = bin2bcd(alm->time.tm_sec);
	181	alarm_data[1] = bin2bcd(alm->time.tm_min);
	182	alarm_data[2] = bin2bcd(alm->time.tm_hour);
	183	alarm_data[3] = bin2bcd(alm->time.tm_mday);
	184	alarm_data[4] = bin2bcd(alm->time.tm_mon + 1);
	185	alarm_data[5] = bin2bcd(alm->time.tm_year - 100);
	186
	187	/* update all the alarm registers in one shot */
	188	ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS,
	189	alarm_data, NUM_TIME_REGS);
	190	if (ret) {
	191	dev_err(dev, "rtc_set_alarm error %d\n", ret);
	192	return ret;
	193	}
	194
	195	if (alm->enabled)
	196	ret = tps65910_rtc_alarm_irq_enable(dev, 1);
	197
	198	return ret;
	199	}
	200
aecb57da VJ	201	static int tps65910_rtc_set_calibration(struct device *dev, int calibration)
	202	{
	203	unsigned char comp_data[NUM_COMP_REGS];
	204	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	205	s16 value;
	206	int ret;
	207
	208	/*
	209	* TPS65910 uses two's complement 16 bit value for compensation for RTC
	210	* crystal inaccuracies. One time every hour when seconds counter
	211	* increments from 0 to 1 compensation value will be added to internal
	212	* RTC counter value.
	213	*
	214	* Compensation value 0x7FFF is prohibited value.
	215	*
	216	* Valid range for compensation value: [-32768 .. 32766]
	217	*/
	218	if ((calibration < -32768) \|\| (calibration > 32766)) {
	219	dev_err(dev, "RTC calibration value out of range: %d\n",
	220	calibration);
	221	return -EINVAL;
	222	}
	223
	224	value = (s16)calibration;
	225
	226	comp_data[0] = (u16)value & 0xFF;
	227	comp_data[1] = ((u16)value >> 8) & 0xFF;
	228
	229	/* Update all the compensation registers in one shot */
	230	ret = regmap_bulk_write(tps->regmap, TPS65910_RTC_COMP_LSB,
	231	comp_data, NUM_COMP_REGS);
	232	if (ret < 0) {
	233	dev_err(dev, "rtc_set_calibration error: %d\n", ret);
	234	return ret;
	235	}
	236
	237	/* Enable automatic compensation */
	238	ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL,
	239	TPS65910_RTC_CTRL_AUTO_COMP, TPS65910_RTC_CTRL_AUTO_COMP);
	240	if (ret < 0)
	241	dev_err(dev, "auto_comp enable failed with error: %d\n", ret);
	242
	243	return ret;
	244	}
	245
	246	static int tps65910_rtc_get_calibration(struct device dev, int calibration)
	247	{
	248	unsigned char comp_data[NUM_COMP_REGS];
	249	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	250	unsigned int ctrl;
	251	u16 value;
	252	int ret;
	253
	254	ret = regmap_read(tps->regmap, TPS65910_RTC_CTRL, &ctrl);
	255	if (ret < 0)
	256	return ret;
	257
	258	/* If automatic compensation is not enabled report back zero */
	259	if (!(ctrl & TPS65910_RTC_CTRL_AUTO_COMP)) {
	260	*calibration = 0;
	261	return 0;
	262	}
	263
	264	ret = regmap_bulk_read(tps->regmap, TPS65910_RTC_COMP_LSB, comp_data,
265	NUM_COMP_REGS);
266	if (ret < 0) {
267	dev_err(dev, "rtc_get_calibration error: %d\n", ret);
268	return ret;
269	}
270
271	value = (u16)comp_data[0] \| ((u16)comp_data[1] << 8);
272
273	*calibration = (s16)value;
274
275	return 0;
276	}
277
278	static int tps65910_read_offset(struct device dev, long offset)
279	{
280	int calibration;
281	s64 tmp;
282	int ret;
283
284	ret = tps65910_rtc_get_calibration(dev, &calibration);
285	if (ret < 0)
286	return ret;
287
288	/* Convert from RTC calibration register format to ppb format */
289	tmp = calibration * (s64)PPB_MULT;
290	if (tmp < 0)
291	tmp -= TICKS_PER_HOUR / 2LL;
292	else
293	tmp += TICKS_PER_HOUR / 2LL;
294	tmp = div_s64(tmp, TICKS_PER_HOUR);
295
296	/* Offset value operates in negative way, so swap sign */
297	*offset = (long)-tmp;
298
299	return 0;
300	}
301
302	static int tps65910_set_offset(struct device *dev, long offset)
303	{
304	int calibration;
305	s64 tmp;
306	int ret;
307
308	/* Make sure offset value is within supported range */
309	if (offset < MIN_OFFSET \|\| offset > MAX_OFFSET)
310	return -ERANGE;
311
312	/* Convert from ppb format to RTC calibration register format */
313	tmp = offset * (s64)TICKS_PER_HOUR;
314	if (tmp < 0)
315	tmp -= PPB_MULT / 2LL;
316	else
317	tmp += PPB_MULT / 2LL;
318	tmp = div_s64(tmp, PPB_MULT);
319
320	/* Offset value operates in negative way, so swap sign */
321	calibration = (int)-tmp;
322
323	ret = tps65910_rtc_set_calibration(dev, calibration);
324
325	return ret;
326	}
327
0e783980 VB	328	static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc)
	329	{
	330	struct device *dev = rtc;
	331	unsigned long events = 0;
	332	struct tps65910 *tps = dev_get_drvdata(dev->parent);
	333	struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
	334	int ret;
	335	u32 rtc_reg;
	336
	337	ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg);
	338	if (ret)
	339	return IRQ_NONE;
	340
	341	if (rtc_reg & TPS65910_RTC_STATUS_ALARM)
	342	events = RTC_IRQF \| RTC_AF;
	343
	344	ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg);
	345	if (ret)
	346	return IRQ_NONE;
	347
	348	/* Notify RTC core on event */
	349	rtc_update_irq(tps_rtc->rtc, 1, events);
	350
	351	return IRQ_HANDLED;
	352	}
	353
	354	static const struct rtc_class_ops tps65910_rtc_ops = {
	355	.read_time = tps65910_rtc_read_time,
	356	.set_time = tps65910_rtc_set_time,
	357	.read_alarm = tps65910_rtc_read_alarm,
	358	.set_alarm = tps65910_rtc_set_alarm,
	359	.alarm_irq_enable = tps65910_rtc_alarm_irq_enable,
aecb57da VJ	360	.read_offset = tps65910_read_offset,
aecb57da VJ	361	.set_offset = tps65910_set_offset,
0e783980 VB	362	};
0e783980 VB	363
db96d571 AS	364	static const struct rtc_class_ops tps65910_rtc_ops_noirq = {
	365	.read_time = tps65910_rtc_read_time,
	366	.set_time = tps65910_rtc_set_time,
	367	.read_offset = tps65910_read_offset,
	368	.set_offset = tps65910_set_offset,
	369	};
	370
5a167f45	371	static int tps65910_rtc_probe(struct platform_device *pdev)
0e783980 VB	372	{
	373	struct tps65910 *tps65910 = NULL;
	374	struct tps65910_rtc *tps_rtc = NULL;
0e783980 VB	375	int ret;
	376	int irq;
	377	u32 rtc_reg;
	378
	379	tps65910 = dev_get_drvdata(pdev->dev.parent);
	380
	381	tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc),
	382	GFP_KERNEL);
	383	if (!tps_rtc)
	384	return -ENOMEM;
	385
e6000a43 AB	386	tps_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
	387	if (IS_ERR(tps_rtc->rtc))
	388	return PTR_ERR(tps_rtc->rtc);
	389
0e783980 VB	390	/* Clear pending interrupts */
	391	ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
	392	if (ret < 0)
	393	return ret;
	394
	395	ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg);
	396	if (ret < 0)
	397	return ret;
	398
	399	dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n");
18c701a9 KM	400
	401	/* Enable RTC digital power domain */
	402	ret = regmap_update_bits(tps65910->regmap, TPS65910_DEVCTRL,
	403	DEVCTRL_RTC_PWDN_MASK, 0 << DEVCTRL_RTC_PWDN_SHIFT);
	404	if (ret < 0)
	405	return ret;
	406
0e783980 VB	407	rtc_reg = TPS65910_RTC_CTRL_STOP_RTC;
	408	ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg);
	409	if (ret < 0)
	410	return ret;
	411
9f7d7a1d TR	412	platform_set_drvdata(pdev, tps_rtc);
9f7d7a1d TR	413
06f77d18	414	irq = platform_get_irq(pdev, 0);
0e783980 VB	415	if (irq <= 0) {
	416	dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
	417	irq);
dbda161b	418	return -ENXIO;
0e783980 VB	419	}
0e783980 VB	420
0e783980	421	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
be563c9a	422	tps65910_rtc_interrupt, IRQF_TRIGGER_LOW,
32c4746c	423	dev_name(&pdev->dev), &pdev->dev);
db96d571 AS	424	if (ret < 0)
	425	irq = -1;
	426
eb5eba4e	427	tps_rtc->irq = irq;
db96d571 AS	428	if (irq != -1) {
	429	device_set_wakeup_capable(&pdev->dev, 1);
	430	tps_rtc->rtc->ops = &tps65910_rtc_ops;
	431	} else
	432	tps_rtc->rtc->ops = &tps65910_rtc_ops_noirq;
0e783980	433
57ad9e69 AB	434	tps_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
57ad9e69 AB	435	tps_rtc->rtc->range_max = RTC_TIMESTAMP_END_2099;
e6000a43	436
44c638ce	437	return rtc_register_device(tps_rtc->rtc);
0e783980 VB	438	}
0e783980 VB	439
0e783980	440	#ifdef CONFIG_PM_SLEEP
0e783980 VB	441	static int tps65910_rtc_suspend(struct device *dev)
0e783980 VB	442	{
eb5eba4e	443	struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
0e783980	444
eb5eba4e LD	445	if (device_may_wakeup(dev))
eb5eba4e LD	446	enable_irq_wake(tps_rtc->irq);
dfaf09ac	447	return 0;
0e783980 VB	448	}
	449
	450	static int tps65910_rtc_resume(struct device *dev)
	451	{
eb5eba4e LD	452	struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev);
	453
	454	if (device_may_wakeup(dev))
	455	disable_irq_wake(tps_rtc->irq);
dfaf09ac	456	return 0;
0e783980	457	}
176a9f20	458	#endif
0e783980	459
e4ae909b JH	460	static SIMPLE_DEV_PM_OPS(tps65910_rtc_pm_ops, tps65910_rtc_suspend,
e4ae909b JH	461	tps65910_rtc_resume);
0e783980	462
0e783980 VB	463	static struct platform_driver tps65910_rtc_driver = {
0e783980 VB	464	.probe = tps65910_rtc_probe,
0e783980	465	.driver = {
0e783980	466	.name = "tps65910-rtc",
176a9f20	467	.pm = &tps65910_rtc_pm_ops,
0e783980 VB	468	},
	469	};
	470
	471	module_platform_driver(tps65910_rtc_driver);
	472	MODULE_ALIAS("platform:rtc-tps65910");
	473	MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
	474	MODULE_LICENSE("GPL");