[deliverable/linux.git] / drivers / rtc / rtc-mpc5121.c

/*
 * Real-time clock driver for MPC5121
 *
 * Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
 * Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
 * Copyright 2011, Dmitry Eremin-Solenikov
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/io.h>
#include <linux/slab.h>

struct mpc5121_rtc_regs {
	u8 set_time;		/* RTC + 0x00 */
	u8 hour_set;		/* RTC + 0x01 */
	u8 minute_set;		/* RTC + 0x02 */
	u8 second_set;		/* RTC + 0x03 */

	u8 set_date;		/* RTC + 0x04 */
	u8 month_set;		/* RTC + 0x05 */
	u8 weekday_set;		/* RTC + 0x06 */
	u8 date_set;		/* RTC + 0x07 */

	u8 write_sw;		/* RTC + 0x08 */
	u8 sw_set;		/* RTC + 0x09 */
	u16 year_set;		/* RTC + 0x0a */

	u8 alm_enable;		/* RTC + 0x0c */
	u8 alm_hour_set;	/* RTC + 0x0d */
	u8 alm_min_set;		/* RTC + 0x0e */
	u8 int_enable;		/* RTC + 0x0f */

	u8 reserved1;
	u8 hour;		/* RTC + 0x11 */
	u8 minute;		/* RTC + 0x12 */
	u8 second;		/* RTC + 0x13 */

	u8 month;		/* RTC + 0x14 */
	u8 wday_mday;		/* RTC + 0x15 */
	u16 year;		/* RTC + 0x16 */

	u8 int_alm;		/* RTC + 0x18 */
	u8 int_sw;		/* RTC + 0x19 */
	u8 alm_status;		/* RTC + 0x1a */
	u8 sw_minute;		/* RTC + 0x1b */

	u8 bus_error_1;		/* RTC + 0x1c */
	u8 int_day;		/* RTC + 0x1d */
	u8 int_min;		/* RTC + 0x1e */
	u8 int_sec;		/* RTC + 0x1f */

	/*
	 * target_time:
	 *	intended to be used for hibernation but hibernation
	 *	does not work on silicon rev 1.5 so use it for non-volatile
	 *	storage of offset between the actual_time register and linux
	 *	time
	 */
	u32 target_time;	/* RTC + 0x20 */
	/*
	 * actual_time:
	 *	readonly time since VBAT_RTC was last connected
	 */
	u32 actual_time;	/* RTC + 0x24 */
	u32 keep_alive;		/* RTC + 0x28 */
};

struct mpc5121_rtc_data {
	unsigned irq;
	unsigned irq_periodic;
	struct mpc5121_rtc_regs __iomem *regs;
	struct rtc_device *rtc;
	struct rtc_wkalrm wkalarm;
};

/*
 * Update second/minute/hour registers.
 *
 * This is just so alarm will work.
 */
static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
				   struct rtc_time *tm)
{
	out_8(&regs->second_set, tm->tm_sec);
	out_8(&regs->minute_set, tm->tm_min);
	out_8(&regs->hour_set, tm->tm_hour);

	/* set time sequence */
	out_8(&regs->set_time, 0x1);
	out_8(&regs->set_time, 0x3);
	out_8(&regs->set_time, 0x1);
	out_8(&regs->set_time, 0x0);
}

static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	unsigned long now;

	/*
	 * linux time is actual_time plus the offset saved in target_time
	 */
	now = in_be32(&regs->actual_time) + in_be32(&regs->target_time);

	rtc_time_to_tm(now, tm);

	/*
	 * update second minute hour registers
	 * so alarms will work
	 */
	mpc5121_rtc_update_smh(regs, tm);

	return rtc_valid_tm(tm);
}

static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	int ret;
	unsigned long now;

	/*
	 * The actual_time register is read only so we write the offset
	 * between it and linux time to the target_time register.
	 */
	ret = rtc_tm_to_time(tm, &now);
	if (ret == 0)
		out_be32(&regs->target_time, now - in_be32(&regs->actual_time));

	/*
	 * update second minute hour registers
	 * so alarms will work
	 */
	mpc5121_rtc_update_smh(regs, tm);

	return 0;
}

static int mpc5200_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	int tmp;

	tm->tm_sec = in_8(&regs->second);
	tm->tm_min = in_8(&regs->minute);

	/* 12 hour format? */
	if (in_8(&regs->hour) & 0x20)
		tm->tm_hour = (in_8(&regs->hour) >> 1) +
			(in_8(&regs->hour) & 1 ? 12 : 0);
	else
		tm->tm_hour = in_8(&regs->hour);

	tmp = in_8(&regs->wday_mday);
	tm->tm_mday = tmp & 0x1f;
	tm->tm_mon = in_8(&regs->month) - 1;
	tm->tm_year = in_be16(&regs->year) - 1900;
	tm->tm_wday = (tmp >> 5) % 7;
	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	tm->tm_isdst = 0;

	return 0;
}

static int mpc5200_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

	mpc5121_rtc_update_smh(regs, tm);

	/* date */
	out_8(&regs->month_set, tm->tm_mon + 1);
	out_8(&regs->weekday_set, tm->tm_wday ? tm->tm_wday : 7);
	out_8(&regs->date_set, tm->tm_mday);
	out_be16(&regs->year_set, tm->tm_year + 1900);

	/* set date sequence */
	out_8(&regs->set_date, 0x1);
	out_8(&regs->set_date, 0x3);
	out_8(&regs->set_date, 0x1);
	out_8(&regs->set_date, 0x0);

	return 0;
}

static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

	*alarm = rtc->wkalarm;

	alarm->pending = in_8(&regs->alm_status);

	return 0;
}

static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

	/*
	 * the alarm has no seconds so deal with it
	 */
	if (alarm->time.tm_sec) {
		alarm->time.tm_sec = 0;
		alarm->time.tm_min++;
		if (alarm->time.tm_min >= 60) {
			alarm->time.tm_min = 0;
			alarm->time.tm_hour++;
			if (alarm->time.tm_hour >= 24)
				alarm->time.tm_hour = 0;
		}
	}

	alarm->time.tm_mday = -1;
	alarm->time.tm_mon = -1;
	alarm->time.tm_year = -1;

	out_8(&regs->alm_min_set, alarm->time.tm_min);
	out_8(&regs->alm_hour_set, alarm->time.tm_hour);

	out_8(&regs->alm_enable, alarm->enabled);

	rtc->wkalarm = *alarm;
	return 0;
}

static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

	if (in_8(&regs->int_alm)) {
		/* acknowledge and clear status */
		out_8(&regs->int_alm, 1);
		out_8(&regs->alm_status, 1);

		rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
		return IRQ_HANDLED;
	}

	return IRQ_NONE;
}

static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

	if (in_8(&regs->int_sec) && (in_8(&regs->int_enable) & 0x1)) {
		/* acknowledge */
		out_8(&regs->int_sec, 1);

		rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF);
		return IRQ_HANDLED;
	}

	return IRQ_NONE;
}

static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
					unsigned int enabled)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	int val;

	if (enabled)
		val = 1;
	else
		val = 0;

	out_8(&regs->alm_enable, val);
	rtc->wkalarm.enabled = val;

	return 0;
}

static const struct rtc_class_ops mpc5121_rtc_ops = {
	.read_time = mpc5121_rtc_read_time,
	.set_time = mpc5121_rtc_set_time,
	.read_alarm = mpc5121_rtc_read_alarm,
	.set_alarm = mpc5121_rtc_set_alarm,
	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
};

static const struct rtc_class_ops mpc5200_rtc_ops = {
	.read_time = mpc5200_rtc_read_time,
	.set_time = mpc5200_rtc_set_time,
	.read_alarm = mpc5121_rtc_read_alarm,
	.set_alarm = mpc5121_rtc_set_alarm,
	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
};

static int mpc5121_rtc_probe(struct platform_device *op)
{
	struct mpc5121_rtc_data *rtc;
	int err = 0;

	rtc = devm_kzalloc(&op->dev, sizeof(*rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	rtc->regs = of_iomap(op->dev.of_node, 0);
	if (!rtc->regs) {
		dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
		return -ENOSYS;
	}

	device_init_wakeup(&op->dev, 1);

	platform_set_drvdata(op, rtc);

	rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
	err = request_irq(rtc->irq, mpc5121_rtc_handler, 0,
						"mpc5121-rtc", &op->dev);
	if (err) {
		dev_err(&op->dev, "%s: could not request irq: %i\n",
							__func__, rtc->irq);
		goto out_dispose;
	}

	rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
	err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
				0, "mpc5121-rtc_upd", &op->dev);
	if (err) {
		dev_err(&op->dev, "%s: could not request irq: %i\n",
						__func__, rtc->irq_periodic);
		goto out_dispose2;
	}

	if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) {
		u32 ka;
		ka = in_be32(&rtc->regs->keep_alive);
		if (ka & 0x02) {
			dev_warn(&op->dev,
				"mpc5121-rtc: Battery or oscillator failure!\n");
			out_be32(&rtc->regs->keep_alive, ka);
		}

		rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5121-rtc",
						&mpc5121_rtc_ops, THIS_MODULE);
	} else {
		rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5200-rtc",
						&mpc5200_rtc_ops, THIS_MODULE);
	}

	if (IS_ERR(rtc->rtc)) {
		err = PTR_ERR(rtc->rtc);
		goto out_free_irq;
	}
	rtc->rtc->uie_unsupported = 1;

	return 0;

out_free_irq:
	free_irq(rtc->irq_periodic, &op->dev);
out_dispose2:
	irq_dispose_mapping(rtc->irq_periodic);
	free_irq(rtc->irq, &op->dev);
out_dispose:
	irq_dispose_mapping(rtc->irq);
	iounmap(rtc->regs);

	return err;
}

static int mpc5121_rtc_remove(struct platform_device *op)
{
	struct mpc5121_rtc_data *rtc = platform_get_drvdata(op);
	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;

	/* disable interrupt, so there are no nasty surprises */
	out_8(&regs->alm_enable, 0);
	out_8(&regs->int_enable, in_8(&regs->int_enable) & ~0x1);

	iounmap(rtc->regs);
	free_irq(rtc->irq, &op->dev);
	free_irq(rtc->irq_periodic, &op->dev);
	irq_dispose_mapping(rtc->irq);
	irq_dispose_mapping(rtc->irq_periodic);

	return 0;
}

#ifdef CONFIG_OF
static struct of_device_id mpc5121_rtc_match[] = {
	{ .compatible = "fsl,mpc5121-rtc", },
	{ .compatible = "fsl,mpc5200-rtc", },
	{},
};
#endif

static struct platform_driver mpc5121_rtc_driver = {
	.driver = {
		.name = "mpc5121-rtc",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(mpc5121_rtc_match),
	},
	.probe = mpc5121_rtc_probe,
	.remove = mpc5121_rtc_remove,
};

module_platform_driver(mpc5121_rtc_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");
Commit	Line	Data
50aae724 AG	1	/*
	2	* Real-time clock driver for MPC5121
	3	*
	4	* Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
	5	* Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
955dbea3	6	* Copyright 2011, Dmitry Eremin-Solenikov
50aae724 AG	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/rtc.h>
c8a6046e	16	#include <linux/of.h>
50aae724 AG	17	#include <linux/of_device.h>
	18	#include <linux/of_platform.h>
	19	#include <linux/io.h>
5a0e3ad6	20	#include <linux/slab.h>
50aae724 AG	21
	22	struct mpc5121_rtc_regs {
	23	u8 set_time; /* RTC + 0x00 */
	24	u8 hour_set; /* RTC + 0x01 */
	25	u8 minute_set; /* RTC + 0x02 */
	26	u8 second_set; /* RTC + 0x03 */
	27
	28	u8 set_date; /* RTC + 0x04 */
	29	u8 month_set; /* RTC + 0x05 */
	30	u8 weekday_set; /* RTC + 0x06 */
	31	u8 date_set; /* RTC + 0x07 */
	32
	33	u8 write_sw; /* RTC + 0x08 */
	34	u8 sw_set; /* RTC + 0x09 */
	35	u16 year_set; /* RTC + 0x0a */
	36
	37	u8 alm_enable; /* RTC + 0x0c */
	38	u8 alm_hour_set; /* RTC + 0x0d */
	39	u8 alm_min_set; /* RTC + 0x0e */
	40	u8 int_enable; /* RTC + 0x0f */
	41
	42	u8 reserved1;
	43	u8 hour; /* RTC + 0x11 */
	44	u8 minute; /* RTC + 0x12 */
	45	u8 second; /* RTC + 0x13 */
	46
	47	u8 month; /* RTC + 0x14 */
	48	u8 wday_mday; /* RTC + 0x15 */
	49	u16 year; /* RTC + 0x16 */
	50
	51	u8 int_alm; /* RTC + 0x18 */
	52	u8 int_sw; /* RTC + 0x19 */
	53	u8 alm_status; /* RTC + 0x1a */
	54	u8 sw_minute; /* RTC + 0x1b */
	55
	56	u8 bus_error_1; /* RTC + 0x1c */
	57	u8 int_day; /* RTC + 0x1d */
	58	u8 int_min; /* RTC + 0x1e */
	59	u8 int_sec; /* RTC + 0x1f */
	60
	61	/*
	62	* target_time:
	63	* intended to be used for hibernation but hibernation
	64	* does not work on silicon rev 1.5 so use it for non-volatile
	65	* storage of offset between the actual_time register and linux
	66	* time
	67	*/
	68	u32 target_time; /* RTC + 0x20 */
	69	/*
	70	* actual_time:
07d27f2d	71	* readonly time since VBAT_RTC was last connected
50aae724 AG	72	*/
	73	u32 actual_time; /* RTC + 0x24 */
	74	u32 keep_alive; /* RTC + 0x28 */
	75	};
	76
	77	struct mpc5121_rtc_data {
	78	unsigned irq;
	79	unsigned irq_periodic;
	80	struct mpc5121_rtc_regs __iomem *regs;
	81	struct rtc_device *rtc;
	82	struct rtc_wkalrm wkalarm;
	83	};
	84
	85	/*
	86	* Update second/minute/hour registers.
	87	*
	88	* This is just so alarm will work.
	89	*/
	90	static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
	91	struct rtc_time *tm)
	92	{
	93	out_8(&regs->second_set, tm->tm_sec);
	94	out_8(&regs->minute_set, tm->tm_min);
	95	out_8(&regs->hour_set, tm->tm_hour);
	96
	97	/* set time sequence */
	98	out_8(&regs->set_time, 0x1);
	99	out_8(&regs->set_time, 0x3);
	100	out_8(&regs->set_time, 0x1);
	101	out_8(&regs->set_time, 0x0);
	102	}
	103
	104	static int mpc5121_rtc_read_time(struct device dev, struct rtc_time tm)
	105	{
	106	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	107	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	108	unsigned long now;
	109
	110	/*
	111	* linux time is actual_time plus the offset saved in target_time
	112	*/
	113	now = in_be32(&regs->actual_time) + in_be32(&regs->target_time);
	114
	115	rtc_time_to_tm(now, tm);
	116
	117	/*
	118	* update second minute hour registers
	119	* so alarms will work
	120	*/
	121	mpc5121_rtc_update_smh(regs, tm);
	122
	123	return rtc_valid_tm(tm);
	124	}
	125
	126	static int mpc5121_rtc_set_time(struct device dev, struct rtc_time tm)
	127	{
	128	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	129	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	130	int ret;
	131	unsigned long now;
	132
	133	/*
	134	* The actual_time register is read only so we write the offset
	135	* between it and linux time to the target_time register.
136	*/
137	ret = rtc_tm_to_time(tm, &now);
138	if (ret == 0)
139	out_be32(&regs->target_time, now - in_be32(&regs->actual_time));
140
141	/*
142	* update second minute hour registers
143	* so alarms will work
144	*/
145	mpc5121_rtc_update_smh(regs, tm);
146
147	return 0;
148	}
149
955dbea3 DES	150	static int mpc5200_rtc_read_time(struct device dev, struct rtc_time tm)
	151	{
	152	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	153	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	154	int tmp;
	155
	156	tm->tm_sec = in_8(&regs->second);
	157	tm->tm_min = in_8(&regs->minute);
	158
	159	/* 12 hour format? */
	160	if (in_8(&regs->hour) & 0x20)
	161	tm->tm_hour = (in_8(&regs->hour) >> 1) +
	162	(in_8(&regs->hour) & 1 ? 12 : 0);
	163	else
	164	tm->tm_hour = in_8(&regs->hour);
	165
	166	tmp = in_8(&regs->wday_mday);
	167	tm->tm_mday = tmp & 0x1f;
	168	tm->tm_mon = in_8(&regs->month) - 1;
	169	tm->tm_year = in_be16(&regs->year) - 1900;
	170	tm->tm_wday = (tmp >> 5) % 7;
	171	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	172	tm->tm_isdst = 0;
	173
	174	return 0;
	175	}
	176
	177	static int mpc5200_rtc_set_time(struct device dev, struct rtc_time tm)
	178	{
	179	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	180	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	181
	182	mpc5121_rtc_update_smh(regs, tm);
	183
	184	/* date */
	185	out_8(&regs->month_set, tm->tm_mon + 1);
	186	out_8(&regs->weekday_set, tm->tm_wday ? tm->tm_wday : 7);
	187	out_8(&regs->date_set, tm->tm_mday);
	188	out_be16(&regs->year_set, tm->tm_year + 1900);
	189
	190	/* set date sequence */
	191	out_8(&regs->set_date, 0x1);
	192	out_8(&regs->set_date, 0x3);
	193	out_8(&regs->set_date, 0x1);
	194	out_8(&regs->set_date, 0x0);
	195
	196	return 0;
	197	}
	198
50aae724 AG	199	static int mpc5121_rtc_read_alarm(struct device dev, struct rtc_wkalrm alarm)
	200	{
	201	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	202	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	203
	204	*alarm = rtc->wkalarm;
	205
	206	alarm->pending = in_8(&regs->alm_status);
	207
	208	return 0;
	209	}
	210
	211	static int mpc5121_rtc_set_alarm(struct device dev, struct rtc_wkalrm alarm)
	212	{
	213	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	214	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	215
	216	/*
	217	* the alarm has no seconds so deal with it
	218	*/
	219	if (alarm->time.tm_sec) {
	220	alarm->time.tm_sec = 0;
	221	alarm->time.tm_min++;
	222	if (alarm->time.tm_min >= 60) {
	223	alarm->time.tm_min = 0;
	224	alarm->time.tm_hour++;
	225	if (alarm->time.tm_hour >= 24)
	226	alarm->time.tm_hour = 0;
	227	}
	228	}
	229
	230	alarm->time.tm_mday = -1;
	231	alarm->time.tm_mon = -1;
	232	alarm->time.tm_year = -1;
	233
	234	out_8(&regs->alm_min_set, alarm->time.tm_min);
	235	out_8(&regs->alm_hour_set, alarm->time.tm_hour);
	236
	237	out_8(&regs->alm_enable, alarm->enabled);
	238
	239	rtc->wkalarm = *alarm;
	240	return 0;
	241	}
	242
	243	static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
	244	{
	245	struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
	246	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	247
	248	if (in_8(&regs->int_alm)) {
	249	/* acknowledge and clear status */
	250	out_8(&regs->int_alm, 1);
	251	out_8(&regs->alm_status, 1);
	252
	253	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	254	return IRQ_HANDLED;
	255	}
	256
	257	return IRQ_NONE;
	258	}
	259
	260	static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
	261	{
	262	struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
263	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
264
265	if (in_8(&regs->int_sec) && (in_8(&regs->int_enable) & 0x1)) {
266	/* acknowledge */
267	out_8(&regs->int_sec, 1);
268
269	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_UF);
270	return IRQ_HANDLED;
271	}
272
273	return IRQ_NONE;
274	}
275
276	static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
277	unsigned int enabled)
278	{
279	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
280	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
281	int val;
282
283	if (enabled)
284	val = 1;
285	else
286	val = 0;
287
288	out_8(&regs->alm_enable, val);
289	rtc->wkalarm.enabled = val;
290
291	return 0;
292	}
293
50aae724 AG	294	static const struct rtc_class_ops mpc5121_rtc_ops = {
	295	.read_time = mpc5121_rtc_read_time,
	296	.set_time = mpc5121_rtc_set_time,
	297	.read_alarm = mpc5121_rtc_read_alarm,
	298	.set_alarm = mpc5121_rtc_set_alarm,
	299	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
50aae724 AG	300	};
50aae724 AG	301
955dbea3 DES	302	static const struct rtc_class_ops mpc5200_rtc_ops = {
	303	.read_time = mpc5200_rtc_read_time,
	304	.set_time = mpc5200_rtc_set_time,
	305	.read_alarm = mpc5121_rtc_read_alarm,
	306	.set_alarm = mpc5121_rtc_set_alarm,
	307	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
	308	};
	309
5a167f45	310	static int mpc5121_rtc_probe(struct platform_device *op)
50aae724 AG	311	{
	312	struct mpc5121_rtc_data *rtc;
	313	int err = 0;
50aae724	314
073bf424	315	rtc = devm_kzalloc(&op->dev, sizeof(*rtc), GFP_KERNEL);
50aae724 AG	316	if (!rtc)
	317	return -ENOMEM;
	318
295bdd9c	319	rtc->regs = of_iomap(op->dev.of_node, 0);
50aae724 AG	320	if (!rtc->regs) {
50aae724 AG	321	dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
073bf424	322	return -ENOSYS;
50aae724 AG	323	}
	324
	325	device_init_wakeup(&op->dev, 1);
	326
ad87a766	327	platform_set_drvdata(op, rtc);
50aae724	328
295bdd9c	329	rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
2f6e5f94	330	err = request_irq(rtc->irq, mpc5121_rtc_handler, 0,
50aae724 AG	331	"mpc5121-rtc", &op->dev);
	332	if (err) {
	333	dev_err(&op->dev, "%s: could not request irq: %i\n",
	334	__func__, rtc->irq);
	335	goto out_dispose;
	336	}
	337
295bdd9c	338	rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
50aae724	339	err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
2f6e5f94	340	0, "mpc5121-rtc_upd", &op->dev);
50aae724 AG	341	if (err) {
	342	dev_err(&op->dev, "%s: could not request irq: %i\n",
	343	__func__, rtc->irq_periodic);
	344	goto out_dispose2;
	345	}
	346
955dbea3 DES	347	if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) {
	348	u32 ka;
	349	ka = in_be32(&rtc->regs->keep_alive);
	350	if (ka & 0x02) {
	351	dev_warn(&op->dev,
	352	"mpc5121-rtc: Battery or oscillator failure!\n");
	353	out_be32(&rtc->regs->keep_alive, ka);
	354	}
	355
073bf424	356	rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5121-rtc",
955dbea3 DES	357	&mpc5121_rtc_ops, THIS_MODULE);
955dbea3 DES	358	} else {
073bf424	359	rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5200-rtc",
955dbea3	360	&mpc5200_rtc_ops, THIS_MODULE);
50aae724 AG	361	}
50aae724 AG	362
50aae724 AG	363	if (IS_ERR(rtc->rtc)) {
	364	err = PTR_ERR(rtc->rtc);
	365	goto out_free_irq;
	366	}
e48b5e82	367	rtc->rtc->uie_unsupported = 1;
50aae724 AG	368
	369	return 0;
	370
	371	out_free_irq:
	372	free_irq(rtc->irq_periodic, &op->dev);
	373	out_dispose2:
	374	irq_dispose_mapping(rtc->irq_periodic);
	375	free_irq(rtc->irq, &op->dev);
	376	out_dispose:
	377	irq_dispose_mapping(rtc->irq);
	378	iounmap(rtc->regs);
50aae724 AG	379
	380	return err;
	381	}
	382
5a167f45	383	static int mpc5121_rtc_remove(struct platform_device *op)
50aae724	384	{
ad87a766	385	struct mpc5121_rtc_data *rtc = platform_get_drvdata(op);
50aae724 AG	386	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	387
	388	/* disable interrupt, so there are no nasty surprises */
	389	out_8(&regs->alm_enable, 0);
	390	out_8(&regs->int_enable, in_8(&regs->int_enable) & ~0x1);
	391
50aae724 AG	392	iounmap(rtc->regs);
	393	free_irq(rtc->irq, &op->dev);
	394	free_irq(rtc->irq_periodic, &op->dev);
	395	irq_dispose_mapping(rtc->irq);
	396	irq_dispose_mapping(rtc->irq_periodic);
50aae724 AG	397
	398	return 0;
	399	}
	400
c8a6046e	401	#ifdef CONFIG_OF
5a167f45	402	static struct of_device_id mpc5121_rtc_match[] = {
50aae724	403	{ .compatible = "fsl,mpc5121-rtc", },
955dbea3	404	{ .compatible = "fsl,mpc5200-rtc", },
50aae724 AG	405	{},
50aae724 AG	406	};
c8a6046e	407	#endif
50aae724	408
1c48a5c9	409	static struct platform_driver mpc5121_rtc_driver = {
295bdd9c GL	410	.driver = {
	411	.name = "mpc5121-rtc",
	412	.owner = THIS_MODULE,
c8a6046e	413	.of_match_table = of_match_ptr(mpc5121_rtc_match),
295bdd9c	414	},
50aae724	415	.probe = mpc5121_rtc_probe,
5a167f45	416	.remove = mpc5121_rtc_remove,
50aae724 AG	417	};
50aae724 AG	418
0c4eae66	419	module_platform_driver(mpc5121_rtc_driver);
50aae724 AG	420
	421	MODULE_LICENSE("GPL");
	422	MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");