[linux-2.6-block.git] / drivers / rtc / rtc-88pm860x.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Real Time Clock driver for Marvell 88PM860x PMIC
 *
 * Copyright (c) 2010 Marvell International Ltd.
 * Author:	Haojian Zhuang <haojian.zhuang@marvell.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/mfd/88pm860x.h>

#define VRTC_CALIBRATION

struct pm860x_rtc_info {
	struct pm860x_chip	*chip;
	struct i2c_client	*i2c;
	struct rtc_device	*rtc_dev;
	struct device		*dev;
	struct delayed_work	calib_work;

	int			irq;
	int			vrtc;
	int			(*sync)(unsigned int ticks);
};

#define REG_VRTC_MEAS1		0x7D

#define REG0_ADDR		0xB0
#define REG1_ADDR		0xB2
#define REG2_ADDR		0xB4
#define REG3_ADDR		0xB6

#define REG0_DATA		0xB1
#define REG1_DATA		0xB3
#define REG2_DATA		0xB5
#define REG3_DATA		0xB7

/* bit definitions of Measurement Enable Register 2 (0x51) */
#define MEAS2_VRTC		(1 << 0)

/* bit definitions of RTC Register 1 (0xA0) */
#define ALARM_EN		(1 << 3)
#define ALARM_WAKEUP		(1 << 4)
#define ALARM			(1 << 5)
#define RTC1_USE_XO		(1 << 7)

#define VRTC_CALIB_INTERVAL	(HZ * 60 * 10)		/* 10 minutes */

static irqreturn_t rtc_update_handler(int irq, void *data)
{
	struct pm860x_rtc_info *info = (struct pm860x_rtc_info *)data;
	int mask;

	mask = ALARM | ALARM_WAKEUP;
	pm860x_set_bits(info->i2c, PM8607_RTC1, mask | ALARM_EN, mask);
	rtc_update_irq(info->rtc_dev, 1, RTC_AF);
	return IRQ_HANDLED;
}

static int pm860x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct pm860x_rtc_info *info = dev_get_drvdata(dev);

	if (enabled)
		pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, ALARM_EN);
	else
		pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
	return 0;
}

/*
 * Calculate the next alarm time given the requested alarm time mask
 * and the current time.
 */
static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
				struct rtc_time *alrm)
{
	unsigned long next_time;
	unsigned long now_time;

	next->tm_year = now->tm_year;
	next->tm_mon = now->tm_mon;
	next->tm_mday = now->tm_mday;
	next->tm_hour = alrm->tm_hour;
	next->tm_min = alrm->tm_min;
	next->tm_sec = alrm->tm_sec;

	rtc_tm_to_time(now, &now_time);
	rtc_tm_to_time(next, &next_time);

	if (next_time < now_time) {
		/* Advance one day */
		next_time += 60 * 60 * 24;
		rtc_time_to_tm(next_time, next);
	}
}

static int pm860x_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[8];
	unsigned long ticks, base, data;

	pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
	dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
		buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
	base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
		(buf[5] << 8) | buf[7];

	/* load 32-bit read-only counter */
	pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
	data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
		(buf[1] << 8) | buf[0];
	ticks = base + data;
	dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
		base, data, ticks);

	rtc_time_to_tm(ticks, tm);

	return 0;
}

static int pm860x_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[4];
	unsigned long ticks, base, data;

	if (tm->tm_year > 206) {
		dev_dbg(info->dev, "Set time %d out of range. "
			"Please set time between 1970 to 2106.\n",
			1900 + tm->tm_year);
		return -EINVAL;
	}
	rtc_tm_to_time(tm, &ticks);

	/* load 32-bit read-only counter */
	pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
	data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
		(buf[1] << 8) | buf[0];
	base = ticks - data;
	dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
		base, data, ticks);

	pm860x_page_reg_write(info->i2c, REG0_DATA, (base >> 24) & 0xFF);
	pm860x_page_reg_write(info->i2c, REG1_DATA, (base >> 16) & 0xFF);
	pm860x_page_reg_write(info->i2c, REG2_DATA, (base >> 8) & 0xFF);
	pm860x_page_reg_write(info->i2c, REG3_DATA, base & 0xFF);

	if (info->sync)
		info->sync(ticks);
	return 0;
}

static int pm860x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	unsigned char buf[8];
	unsigned long ticks, base, data;
	int ret;

	pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
	dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
		buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
	base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
		(buf[5] << 8) | buf[7];

	pm860x_bulk_read(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
	data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
		(buf[1] << 8) | buf[0];
	ticks = base + data;
	dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
		base, data, ticks);

	rtc_time_to_tm(ticks, &alrm->time);
	ret = pm860x_reg_read(info->i2c, PM8607_RTC1);
	alrm->enabled = (ret & ALARM_EN) ? 1 : 0;
	alrm->pending = (ret & (ALARM | ALARM_WAKEUP)) ? 1 : 0;
	return 0;
}

static int pm860x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	struct rtc_time now_tm, alarm_tm;
	unsigned long ticks, base, data;
	unsigned char buf[8];
	int mask;

	pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);

	pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
	dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
		buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
	base = ((unsigned long)buf[1] << 24) | (buf[3] << 16) |
		(buf[5] << 8) | buf[7];

	/* load 32-bit read-only counter */
	pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
	data = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
		(buf[1] << 8) | buf[0];
	ticks = base + data;
	dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
		base, data, ticks);

	rtc_time_to_tm(ticks, &now_tm);
	rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
	/* get new ticks for alarm in 24 hours */
	rtc_tm_to_time(&alarm_tm, &ticks);
	data = ticks - base;

	buf[0] = data & 0xff;
	buf[1] = (data >> 8) & 0xff;
	buf[2] = (data >> 16) & 0xff;
	buf[3] = (data >> 24) & 0xff;
	pm860x_bulk_write(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
	if (alrm->enabled) {
		mask = ALARM | ALARM_WAKEUP | ALARM_EN;
		pm860x_set_bits(info->i2c, PM8607_RTC1, mask, mask);
	} else {
		mask = ALARM | ALARM_WAKEUP | ALARM_EN;
		pm860x_set_bits(info->i2c, PM8607_RTC1, mask,
				ALARM | ALARM_WAKEUP);
	}
	return 0;
}

static const struct rtc_class_ops pm860x_rtc_ops = {
	.read_time	= pm860x_rtc_read_time,
	.set_time	= pm860x_rtc_set_time,
	.read_alarm	= pm860x_rtc_read_alarm,
	.set_alarm	= pm860x_rtc_set_alarm,
	.alarm_irq_enable = pm860x_rtc_alarm_irq_enable,
};

#ifdef VRTC_CALIBRATION
static void calibrate_vrtc_work(struct work_struct *work)
{
	struct pm860x_rtc_info *info = container_of(work,
		struct pm860x_rtc_info, calib_work.work);
	unsigned char buf[2];
	unsigned int sum, data, mean, vrtc_set;
	int i;

	for (i = 0, sum = 0; i < 16; i++) {
		msleep(100);
		pm860x_bulk_read(info->i2c, REG_VRTC_MEAS1, 2, buf);
		data = (buf[0] << 4) | buf[1];
		data = (data * 5400) >> 12;	/* convert to mv */
		sum += data;
	}
	mean = sum >> 4;
	vrtc_set = 2700 + (info->vrtc & 0x3) * 200;
	dev_dbg(info->dev, "mean:%d, vrtc_set:%d\n", mean, vrtc_set);

	sum = pm860x_reg_read(info->i2c, PM8607_RTC_MISC1);
	data = sum & 0x3;
	if ((mean + 200) < vrtc_set) {
		/* try higher voltage */
		if (++data == 4)
			goto out;
		data = (sum & 0xf8) | (data & 0x3);
		pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
	} else if ((mean - 200) > vrtc_set) {
		/* try lower voltage */
		if (data-- == 0)
			goto out;
		data = (sum & 0xf8) | (data & 0x3);
		pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
	} else
		goto out;
	dev_dbg(info->dev, "set 0x%x to RTC_MISC1\n", data);
	/* trigger next calibration since VRTC is updated */
	schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
	return;
out:
	/* disable measurement */
	pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
	dev_dbg(info->dev, "finish VRTC calibration\n");
	return;
}
#endif

#ifdef CONFIG_OF
static int pm860x_rtc_dt_init(struct platform_device *pdev,
			      struct pm860x_rtc_info *info)
{
	struct device_node *np = pdev->dev.parent->of_node;
	int ret;
	if (!np)
		return -ENODEV;
	np = of_get_child_by_name(np, "rtc");
	if (!np) {
		dev_err(&pdev->dev, "failed to find rtc node\n");
		return -ENODEV;
	}
	ret = of_property_read_u32(np, "marvell,88pm860x-vrtc", &info->vrtc);
	if (ret)
		info->vrtc = 0;
	of_node_put(np);
	return 0;
}
#else
#define pm860x_rtc_dt_init(x, y)	(-1)
#endif

static int pm860x_rtc_probe(struct platform_device *pdev)
{
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct pm860x_rtc_pdata *pdata = NULL;
	struct pm860x_rtc_info *info;
	struct rtc_time tm;
	unsigned long ticks = 0;
	int ret;

	pdata = dev_get_platdata(&pdev->dev);

	info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_rtc_info),
			    GFP_KERNEL);
	if (!info)
		return -ENOMEM;
	info->irq = platform_get_irq(pdev, 0);
	if (info->irq < 0) {
		dev_err(&pdev->dev, "No IRQ resource!\n");
		return info->irq;
	}

	info->chip = chip;
	info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
	info->dev = &pdev->dev;
	dev_set_drvdata(&pdev->dev, info);

	ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
					rtc_update_handler, IRQF_ONESHOT, "rtc",
					info);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
			info->irq, ret);
		return ret;
	}

	/* set addresses of 32-bit base value for RTC time */
	pm860x_page_reg_write(info->i2c, REG0_ADDR, REG0_DATA);
	pm860x_page_reg_write(info->i2c, REG1_ADDR, REG1_DATA);
	pm860x_page_reg_write(info->i2c, REG2_ADDR, REG2_DATA);
	pm860x_page_reg_write(info->i2c, REG3_ADDR, REG3_DATA);

	ret = pm860x_rtc_read_time(&pdev->dev, &tm);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to read initial time.\n");
		return ret;
	}
	if ((tm.tm_year < 70) || (tm.tm_year > 138)) {
		tm.tm_year = 70;
		tm.tm_mon = 0;
		tm.tm_mday = 1;
		tm.tm_hour = 0;
		tm.tm_min = 0;
		tm.tm_sec = 0;
		ret = pm860x_rtc_set_time(&pdev->dev, &tm);
		if (ret < 0) {
			dev_err(&pdev->dev, "Failed to set initial time.\n");
			return ret;
		}
	}
	rtc_tm_to_time(&tm, &ticks);
	if (pm860x_rtc_dt_init(pdev, info)) {
		if (pdata && pdata->sync) {
			pdata->sync(ticks);
			info->sync = pdata->sync;
		}
	}

	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "88pm860x-rtc",
					    &pm860x_rtc_ops, THIS_MODULE);
	ret = PTR_ERR(info->rtc_dev);
	if (IS_ERR(info->rtc_dev)) {
		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
		return ret;
	}

	/*
	 * enable internal XO instead of internal 3.25MHz clock since it can
	 * free running in PMIC power-down state.
	 */
	pm860x_set_bits(info->i2c, PM8607_RTC1, RTC1_USE_XO, RTC1_USE_XO);

#ifdef VRTC_CALIBRATION
	/* <00> -- 2.7V, <01> -- 2.9V, <10> -- 3.1V, <11> -- 3.3V */
	if (pm860x_rtc_dt_init(pdev, info)) {
		if (pdata && pdata->vrtc)
			info->vrtc = pdata->vrtc & 0x3;
		else
			info->vrtc = 1;
	}
	pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC);

	/* calibrate VRTC */
	INIT_DELAYED_WORK(&info->calib_work, calibrate_vrtc_work);
	schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
#endif	/* VRTC_CALIBRATION */

	device_init_wakeup(&pdev->dev, 1);

	return 0;
}

static int pm860x_rtc_remove(struct platform_device *pdev)
{
	struct pm860x_rtc_info *info = platform_get_drvdata(pdev);

#ifdef VRTC_CALIBRATION
	cancel_delayed_work_sync(&info->calib_work);
	/* disable measurement */
	pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
#endif	/* VRTC_CALIBRATION */

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int pm860x_rtc_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);

	if (device_may_wakeup(dev))
		chip->wakeup_flag |= 1 << PM8607_IRQ_RTC;
	return 0;
}
static int pm860x_rtc_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);

	if (device_may_wakeup(dev))
		chip->wakeup_flag &= ~(1 << PM8607_IRQ_RTC);
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(pm860x_rtc_pm_ops, pm860x_rtc_suspend, pm860x_rtc_resume);

static struct platform_driver pm860x_rtc_driver = {
	.driver		= {
		.name	= "88pm860x-rtc",
		.pm	= &pm860x_rtc_pm_ops,
	},
	.probe		= pm860x_rtc_probe,
	.remove		= pm860x_rtc_remove,
};

module_platform_driver(pm860x_rtc_driver);

MODULE_DESCRIPTION("Marvell 88PM860x RTC driver");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
008b3040 HZ	2	/*
	3	* Real Time Clock driver for Marvell 88PM860x PMIC
	4	*
	5	* Copyright (c) 2010 Marvell International Ltd.
	6	* Author: Haojian Zhuang <haojian.zhuang@marvell.com>
008b3040 HZ	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
2e57d567	11	#include <linux/of.h>
008b3040 HZ	12	#include <linux/platform_device.h>
	13	#include <linux/slab.h>
	14	#include <linux/mutex.h>
	15	#include <linux/rtc.h>
	16	#include <linux/delay.h>
	17	#include <linux/mfd/core.h>
	18	#include <linux/mfd/88pm860x.h>
	19
	20	#define VRTC_CALIBRATION
	21
	22	struct pm860x_rtc_info {
	23	struct pm860x_chip *chip;
	24	struct i2c_client *i2c;
	25	struct rtc_device *rtc_dev;
	26	struct device *dev;
	27	struct delayed_work calib_work;
	28
	29	int irq;
	30	int vrtc;
	31	int (*sync)(unsigned int ticks);
	32	};
	33
	34	#define REG_VRTC_MEAS1 0x7D
	35
	36	#define REG0_ADDR 0xB0
	37	#define REG1_ADDR 0xB2
	38	#define REG2_ADDR 0xB4
	39	#define REG3_ADDR 0xB6
	40
	41	#define REG0_DATA 0xB1
	42	#define REG1_DATA 0xB3
	43	#define REG2_DATA 0xB5
	44	#define REG3_DATA 0xB7
	45
	46	/* bit definitions of Measurement Enable Register 2 (0x51) */
	47	#define MEAS2_VRTC (1 << 0)
	48
	49	/* bit definitions of RTC Register 1 (0xA0) */
	50	#define ALARM_EN (1 << 3)
	51	#define ALARM_WAKEUP (1 << 4)
	52	#define ALARM (1 << 5)
	53	#define RTC1_USE_XO (1 << 7)
	54
	55	#define VRTC_CALIB_INTERVAL (HZ * 60 * 10) /* 10 minutes */
	56
	57	static irqreturn_t rtc_update_handler(int irq, void *data)
	58	{
	59	struct pm860x_rtc_info info = (struct pm860x_rtc_info )data;
	60	int mask;
	61
	62	mask = ALARM \| ALARM_WAKEUP;
	63	pm860x_set_bits(info->i2c, PM8607_RTC1, mask \| ALARM_EN, mask);
	64	rtc_update_irq(info->rtc_dev, 1, RTC_AF);
	65	return IRQ_HANDLED;
	66	}
	67
	68	static int pm860x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	69	{
	70	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	71
	72	if (enabled)
fd835d1f	73	pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, ALARM_EN);
008b3040	74	else
fd835d1f	75	pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
008b3040 HZ	76	return 0;
	77	}
	78
	79	/*
	80	* Calculate the next alarm time given the requested alarm time mask
	81	* and the current time.
	82	*/
	83	static void rtc_next_alarm_time(struct rtc_time next, struct rtc_time now,
	84	struct rtc_time *alrm)
	85	{
	86	unsigned long next_time;
	87	unsigned long now_time;
	88
	89	next->tm_year = now->tm_year;
	90	next->tm_mon = now->tm_mon;
	91	next->tm_mday = now->tm_mday;
	92	next->tm_hour = alrm->tm_hour;
	93	next->tm_min = alrm->tm_min;
	94	next->tm_sec = alrm->tm_sec;
	95
	96	rtc_tm_to_time(now, &now_time);
	97	rtc_tm_to_time(next, &next_time);
	98
	99	if (next_time < now_time) {
	100	/* Advance one day */
	101	next_time += 60 * 60 * 24;
	102	rtc_time_to_tm(next_time, next);
	103	}
	104	}
	105
	106	static int pm860x_rtc_read_time(struct device dev, struct rtc_time tm)
	107	{
	108	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	109	unsigned char buf[8];
	110	unsigned long ticks, base, data;
	111
	112	pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
	113	dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
	114	buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
dc9e4716 CIK	115	base = ((unsigned long)buf[1] << 24) \| (buf[3] << 16) \|
dc9e4716 CIK	116	(buf[5] << 8) \| buf[7];
008b3040 HZ	117
	118	/* load 32-bit read-only counter */
	119	pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
dc9e4716 CIK	120	data = ((unsigned long)buf[3] << 24) \| (buf[2] << 16) \|
dc9e4716 CIK	121	(buf[1] << 8) \| buf[0];
008b3040 HZ	122	ticks = base + data;
	123	dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
	124	base, data, ticks);
	125
	126	rtc_time_to_tm(ticks, tm);
	127
	128	return 0;
	129	}
	130
	131	static int pm860x_rtc_set_time(struct device dev, struct rtc_time tm)
	132	{
	133	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	134	unsigned char buf[4];
	135	unsigned long ticks, base, data;
	136
9dddb1bd	137	if (tm->tm_year > 206) {
008b3040	138	dev_dbg(info->dev, "Set time %d out of range. "
9dddb1bd	139	"Please set time between 1970 to 2106.\n",
008b3040 HZ	140	1900 + tm->tm_year);
	141	return -EINVAL;
	142	}
	143	rtc_tm_to_time(tm, &ticks);
	144
	145	/* load 32-bit read-only counter */
	146	pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
dc9e4716 CIK	147	data = ((unsigned long)buf[3] << 24) \| (buf[2] << 16) \|
dc9e4716 CIK	148	(buf[1] << 8) \| buf[0];
008b3040 HZ	149	base = ticks - data;
	150	dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
	151	base, data, ticks);
	152
	153	pm860x_page_reg_write(info->i2c, REG0_DATA, (base >> 24) & 0xFF);
	154	pm860x_page_reg_write(info->i2c, REG1_DATA, (base >> 16) & 0xFF);
	155	pm860x_page_reg_write(info->i2c, REG2_DATA, (base >> 8) & 0xFF);
	156	pm860x_page_reg_write(info->i2c, REG3_DATA, base & 0xFF);
	157
	158	if (info->sync)
	159	info->sync(ticks);
	160	return 0;
	161	}
	162
	163	static int pm860x_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	164	{
	165	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	166	unsigned char buf[8];
	167	unsigned long ticks, base, data;
	168	int ret;
	169
	170	pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
	171	dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
	172	buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
dc9e4716 CIK	173	base = ((unsigned long)buf[1] << 24) \| (buf[3] << 16) \|
dc9e4716 CIK	174	(buf[5] << 8) \| buf[7];
008b3040 HZ	175
008b3040 HZ	176	pm860x_bulk_read(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
dc9e4716 CIK	177	data = ((unsigned long)buf[3] << 24) \| (buf[2] << 16) \|
dc9e4716 CIK	178	(buf[1] << 8) \| buf[0];
008b3040 HZ	179	ticks = base + data;
	180	dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
	181	base, data, ticks);
	182
	183	rtc_time_to_tm(ticks, &alrm->time);
	184	ret = pm860x_reg_read(info->i2c, PM8607_RTC1);
	185	alrm->enabled = (ret & ALARM_EN) ? 1 : 0;
	186	alrm->pending = (ret & (ALARM \| ALARM_WAKEUP)) ? 1 : 0;
	187	return 0;
	188	}
	189
	190	static int pm860x_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	191	{
	192	struct pm860x_rtc_info *info = dev_get_drvdata(dev);
	193	struct rtc_time now_tm, alarm_tm;
	194	unsigned long ticks, base, data;
	195	unsigned char buf[8];
	196	int mask;
	197
	198	pm860x_set_bits(info->i2c, PM8607_RTC1, ALARM_EN, 0);
	199
	200	pm860x_page_bulk_read(info->i2c, REG0_ADDR, 8, buf);
	201	dev_dbg(info->dev, "%x-%x-%x-%x-%x-%x-%x-%x\n", buf[0], buf[1],
	202	buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
dc9e4716 CIK	203	base = ((unsigned long)buf[1] << 24) \| (buf[3] << 16) \|
dc9e4716 CIK	204	(buf[5] << 8) \| buf[7];
008b3040 HZ	205
	206	/* load 32-bit read-only counter */
	207	pm860x_bulk_read(info->i2c, PM8607_RTC_COUNTER1, 4, buf);
dc9e4716 CIK	208	data = ((unsigned long)buf[3] << 24) \| (buf[2] << 16) \|
dc9e4716 CIK	209	(buf[1] << 8) \| buf[0];
008b3040 HZ	210	ticks = base + data;
	211	dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
	212	base, data, ticks);
	213
	214	rtc_time_to_tm(ticks, &now_tm);
	215	rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
	216	/* get new ticks for alarm in 24 hours */
	217	rtc_tm_to_time(&alarm_tm, &ticks);
	218	data = ticks - base;
	219
	220	buf[0] = data & 0xff;
	221	buf[1] = (data >> 8) & 0xff;
	222	buf[2] = (data >> 16) & 0xff;
	223	buf[3] = (data >> 24) & 0xff;
	224	pm860x_bulk_write(info->i2c, PM8607_RTC_EXPIRE1, 4, buf);
	225	if (alrm->enabled) {
	226	mask = ALARM \| ALARM_WAKEUP \| ALARM_EN;
	227	pm860x_set_bits(info->i2c, PM8607_RTC1, mask, mask);
	228	} else {
	229	mask = ALARM \| ALARM_WAKEUP \| ALARM_EN;
	230	pm860x_set_bits(info->i2c, PM8607_RTC1, mask,
	231	ALARM \| ALARM_WAKEUP);
	232	}
	233	return 0;
	234	}
	235
	236	static const struct rtc_class_ops pm860x_rtc_ops = {
	237	.read_time = pm860x_rtc_read_time,
	238	.set_time = pm860x_rtc_set_time,
	239	.read_alarm = pm860x_rtc_read_alarm,
	240	.set_alarm = pm860x_rtc_set_alarm,
	241	.alarm_irq_enable = pm860x_rtc_alarm_irq_enable,
	242	};
	243
	244	#ifdef VRTC_CALIBRATION
	245	static void calibrate_vrtc_work(struct work_struct *work)
	246	{
	247	struct pm860x_rtc_info *info = container_of(work,
	248	struct pm860x_rtc_info, calib_work.work);
	249	unsigned char buf[2];
	250	unsigned int sum, data, mean, vrtc_set;
	251	int i;
	252
	253	for (i = 0, sum = 0; i < 16; i++) {
	254	msleep(100);
	255	pm860x_bulk_read(info->i2c, REG_VRTC_MEAS1, 2, buf);
	256	data = (buf[0] << 4) \| buf[1];
	257	data = (data * 5400) >> 12; /* convert to mv */
	258	sum += data;
	259	}
	260	mean = sum >> 4;
	261	vrtc_set = 2700 + (info->vrtc & 0x3) * 200;
	262	dev_dbg(info->dev, "mean:%d, vrtc_set:%d\n", mean, vrtc_set);
	263
	264	sum = pm860x_reg_read(info->i2c, PM8607_RTC_MISC1);
	265	data = sum & 0x3;
	266	if ((mean + 200) < vrtc_set) {
	267	/* try higher voltage */
	268	if (++data == 4)
	269	goto out;
	270	data = (sum & 0xf8) \| (data & 0x3);
	271	pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
	272	} else if ((mean - 200) > vrtc_set) {
	273	/* try lower voltage */
274	if (data-- == 0)
275	goto out;
276	data = (sum & 0xf8) \| (data & 0x3);
277	pm860x_reg_write(info->i2c, PM8607_RTC_MISC1, data);
278	} else
279	goto out;
280	dev_dbg(info->dev, "set 0x%x to RTC_MISC1\n", data);
281	/* trigger next calibration since VRTC is updated */
282	schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
283	return;
284	out:
285	/* disable measurement */
286	pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
287	dev_dbg(info->dev, "finish VRTC calibration\n");
288	return;
289	}
290	#endif
291
2e57d567	292	#ifdef CONFIG_OF
5a167f45 GKH	293	static int pm860x_rtc_dt_init(struct platform_device *pdev,
5a167f45 GKH	294	struct pm860x_rtc_info *info)
2e57d567 HZ	295	{
	296	struct device_node *np = pdev->dev.parent->of_node;
	297	int ret;
	298	if (!np)
	299	return -ENODEV;
e66040cb	300	np = of_get_child_by_name(np, "rtc");
2e57d567 HZ	301	if (!np) {
	302	dev_err(&pdev->dev, "failed to find rtc node\n");
	303	return -ENODEV;
	304	}
	305	ret = of_property_read_u32(np, "marvell,88pm860x-vrtc", &info->vrtc);
	306	if (ret)
	307	info->vrtc = 0;
1e83d48b	308	of_node_put(np);
2e57d567 HZ	309	return 0;
	310	}
	311	#else
	312	#define pm860x_rtc_dt_init(x, y) (-1)
	313	#endif
	314
5a167f45	315	static int pm860x_rtc_probe(struct platform_device *pdev)
008b3040 HZ	316	{
	317	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	318	struct pm860x_rtc_pdata *pdata = NULL;
	319	struct pm860x_rtc_info *info;
	320	struct rtc_time tm;
	321	unsigned long ticks = 0;
	322	int ret;
	323
82df0b28	324	pdata = dev_get_platdata(&pdev->dev);
008b3040	325
3087b3d0 SK	326	info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_rtc_info),
3087b3d0 SK	327	GFP_KERNEL);
008b3040 HZ	328	if (!info)
	329	return -ENOMEM;
	330	info->irq = platform_get_irq(pdev, 0);
	331	if (info->irq < 0) {
	332	dev_err(&pdev->dev, "No IRQ resource!\n");
3087b3d0	333	return info->irq;
008b3040 HZ	334	}
	335
	336	info->chip = chip;
	337	info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
	338	info->dev = &pdev->dev;
	339	dev_set_drvdata(&pdev->dev, info);
	340
3087b3d0 SK	341	ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
	342	rtc_update_handler, IRQF_ONESHOT, "rtc",
	343	info);
008b3040 HZ	344	if (ret < 0) {
	345	dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
	346	info->irq, ret);
3087b3d0	347	return ret;
008b3040 HZ	348	}
	349
	350	/* set addresses of 32-bit base value for RTC time */
	351	pm860x_page_reg_write(info->i2c, REG0_ADDR, REG0_DATA);
	352	pm860x_page_reg_write(info->i2c, REG1_ADDR, REG1_DATA);
	353	pm860x_page_reg_write(info->i2c, REG2_ADDR, REG2_DATA);
	354	pm860x_page_reg_write(info->i2c, REG3_ADDR, REG3_DATA);
	355
	356	ret = pm860x_rtc_read_time(&pdev->dev, &tm);
	357	if (ret < 0) {
	358	dev_err(&pdev->dev, "Failed to read initial time.\n");
3087b3d0	359	return ret;
008b3040 HZ	360	}
	361	if ((tm.tm_year < 70) \|\| (tm.tm_year > 138)) {
	362	tm.tm_year = 70;
	363	tm.tm_mon = 0;
	364	tm.tm_mday = 1;
	365	tm.tm_hour = 0;
	366	tm.tm_min = 0;
	367	tm.tm_sec = 0;
	368	ret = pm860x_rtc_set_time(&pdev->dev, &tm);
	369	if (ret < 0) {
	370	dev_err(&pdev->dev, "Failed to set initial time.\n");
3087b3d0	371	return ret;
008b3040 HZ	372	}
	373	}
	374	rtc_tm_to_time(&tm, &ticks);
2e57d567 HZ	375	if (pm860x_rtc_dt_init(pdev, info)) {
	376	if (pdata && pdata->sync) {
	377	pdata->sync(ticks);
	378	info->sync = pdata->sync;
	379	}
008b3040 HZ	380	}
008b3040 HZ	381
3087b3d0	382	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "88pm860x-rtc",
008b3040 HZ	383	&pm860x_rtc_ops, THIS_MODULE);
	384	ret = PTR_ERR(info->rtc_dev);
	385	if (IS_ERR(info->rtc_dev)) {
	386	dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
3087b3d0	387	return ret;
008b3040 HZ	388	}
	389
	390	/*
	391	* enable internal XO instead of internal 3.25MHz clock since it can
	392	* free running in PMIC power-down state.
	393	*/
	394	pm860x_set_bits(info->i2c, PM8607_RTC1, RTC1_USE_XO, RTC1_USE_XO);
	395
	396	#ifdef VRTC_CALIBRATION
	397	/* <00> -- 2.7V, <01> -- 2.9V, <10> -- 3.1V, <11> -- 3.3V */
2e57d567 HZ	398	if (pm860x_rtc_dt_init(pdev, info)) {
	399	if (pdata && pdata->vrtc)
	400	info->vrtc = pdata->vrtc & 0x3;
	401	else
	402	info->vrtc = 1;
	403	}
008b3040 HZ	404	pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC);
	405
	406	/* calibrate VRTC */
	407	INIT_DELAYED_WORK(&info->calib_work, calibrate_vrtc_work);
	408	schedule_delayed_work(&info->calib_work, VRTC_CALIB_INTERVAL);
	409	#endif /* VRTC_CALIBRATION */
2853378b JZ	410
	411	device_init_wakeup(&pdev->dev, 1);
	412
008b3040	413	return 0;
008b3040 HZ	414	}
008b3040 HZ	415
5a167f45	416	static int pm860x_rtc_remove(struct platform_device *pdev)
008b3040 HZ	417	{
	418	struct pm860x_rtc_info *info = platform_get_drvdata(pdev);
	419
	420	#ifdef VRTC_CALIBRATION
f22b1ba1	421	cancel_delayed_work_sync(&info->calib_work);
008b3040 HZ	422	/* disable measurement */
	423	pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, 0);
	424	#endif /* VRTC_CALIBRATION */
	425
008b3040 HZ	426	return 0;
	427	}
	428
2853378b JZ	429	#ifdef CONFIG_PM_SLEEP
	430	static int pm860x_rtc_suspend(struct device *dev)
	431	{
	432	struct platform_device *pdev = to_platform_device(dev);
	433	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	434
	435	if (device_may_wakeup(dev))
	436	chip->wakeup_flag \|= 1 << PM8607_IRQ_RTC;
	437	return 0;
	438	}
	439	static int pm860x_rtc_resume(struct device *dev)
	440	{
	441	struct platform_device *pdev = to_platform_device(dev);
	442	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
	443
	444	if (device_may_wakeup(dev))
	445	chip->wakeup_flag &= ~(1 << PM8607_IRQ_RTC);
	446	return 0;
	447	}
	448	#endif
	449
	450	static SIMPLE_DEV_PM_OPS(pm860x_rtc_pm_ops, pm860x_rtc_suspend, pm860x_rtc_resume);
	451
008b3040 HZ	452	static struct platform_driver pm860x_rtc_driver = {
	453	.driver = {
	454	.name = "88pm860x-rtc",
2853378b	455	.pm = &pm860x_rtc_pm_ops,
008b3040 HZ	456	},
008b3040 HZ	457	.probe = pm860x_rtc_probe,
5a167f45	458	.remove = pm860x_rtc_remove,
008b3040 HZ	459	};
008b3040 HZ	460
0c4eae66	461	module_platform_driver(pm860x_rtc_driver);
008b3040 HZ	462
	463	MODULE_DESCRIPTION("Marvell 88PM860x RTC driver");
	464	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	465	MODULE_LICENSE("GPL");