[mirror_ubuntu-bionic-kernel.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_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.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 const struct of_device_id mpc5121_rtc_match[] = {
	{ .compatible = "fsl,mpc5121-rtc", },
	{ .compatible = "fsl,mpc5200-rtc", },
	{},
};
MODULE_DEVICE_TABLE(of, mpc5121_rtc_match);
#endif

static struct platform_driver mpc5121_rtc_driver = {
	.driver = {
		.name = "mpc5121-rtc",
		.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>
5af50730	17	#include <linux/of_address.h>
50aae724	18	#include <linux/of_device.h>
5af50730	19	#include <linux/of_irq.h>
50aae724 AG	20	#include <linux/of_platform.h>
50aae724 AG	21	#include <linux/io.h>
5a0e3ad6	22	#include <linux/slab.h>
50aae724 AG	23
	24	struct mpc5121_rtc_regs {
	25	u8 set_time; /* RTC + 0x00 */
	26	u8 hour_set; /* RTC + 0x01 */
	27	u8 minute_set; /* RTC + 0x02 */
	28	u8 second_set; /* RTC + 0x03 */
	29
	30	u8 set_date; /* RTC + 0x04 */
	31	u8 month_set; /* RTC + 0x05 */
	32	u8 weekday_set; /* RTC + 0x06 */
	33	u8 date_set; /* RTC + 0x07 */
	34
	35	u8 write_sw; /* RTC + 0x08 */
	36	u8 sw_set; /* RTC + 0x09 */
	37	u16 year_set; /* RTC + 0x0a */
	38
	39	u8 alm_enable; /* RTC + 0x0c */
	40	u8 alm_hour_set; /* RTC + 0x0d */
	41	u8 alm_min_set; /* RTC + 0x0e */
	42	u8 int_enable; /* RTC + 0x0f */
	43
	44	u8 reserved1;
	45	u8 hour; /* RTC + 0x11 */
	46	u8 minute; /* RTC + 0x12 */
	47	u8 second; /* RTC + 0x13 */
	48
	49	u8 month; /* RTC + 0x14 */
	50	u8 wday_mday; /* RTC + 0x15 */
	51	u16 year; /* RTC + 0x16 */
	52
	53	u8 int_alm; /* RTC + 0x18 */
	54	u8 int_sw; /* RTC + 0x19 */
	55	u8 alm_status; /* RTC + 0x1a */
	56	u8 sw_minute; /* RTC + 0x1b */
	57
	58	u8 bus_error_1; /* RTC + 0x1c */
	59	u8 int_day; /* RTC + 0x1d */
	60	u8 int_min; /* RTC + 0x1e */
	61	u8 int_sec; /* RTC + 0x1f */
	62
	63	/*
	64	* target_time:
	65	* intended to be used for hibernation but hibernation
	66	* does not work on silicon rev 1.5 so use it for non-volatile
	67	* storage of offset between the actual_time register and linux
	68	* time
	69	*/
	70	u32 target_time; /* RTC + 0x20 */
	71	/*
	72	* actual_time:
07d27f2d	73	* readonly time since VBAT_RTC was last connected
50aae724 AG	74	*/
	75	u32 actual_time; /* RTC + 0x24 */
	76	u32 keep_alive; /* RTC + 0x28 */
	77	};
	78
	79	struct mpc5121_rtc_data {
	80	unsigned irq;
	81	unsigned irq_periodic;
	82	struct mpc5121_rtc_regs __iomem *regs;
	83	struct rtc_device *rtc;
	84	struct rtc_wkalrm wkalarm;
	85	};
	86
	87	/*
	88	* Update second/minute/hour registers.
	89	*
	90	* This is just so alarm will work.
	91	*/
	92	static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
	93	struct rtc_time *tm)
	94	{
	95	out_8(&regs->second_set, tm->tm_sec);
	96	out_8(&regs->minute_set, tm->tm_min);
	97	out_8(&regs->hour_set, tm->tm_hour);
	98
	99	/* set time sequence */
	100	out_8(&regs->set_time, 0x1);
	101	out_8(&regs->set_time, 0x3);
	102	out_8(&regs->set_time, 0x1);
	103	out_8(&regs->set_time, 0x0);
	104	}
	105
	106	static int mpc5121_rtc_read_time(struct device dev, struct rtc_time tm)
	107	{
	108	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	109	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	110	unsigned long now;
	111
	112	/*
	113	* linux time is actual_time plus the offset saved in target_time
	114	*/
	115	now = in_be32(&regs->actual_time) + in_be32(&regs->target_time);
	116
	117	rtc_time_to_tm(now, tm);
	118
	119	/*
	120	* update second minute hour registers
	121	* so alarms will work
	122	*/
	123	mpc5121_rtc_update_smh(regs, tm);
	124
	125	return rtc_valid_tm(tm);
	126	}
	127
	128	static int mpc5121_rtc_set_time(struct device dev, struct rtc_time tm)
	129	{
	130	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	131	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	132	int ret;
	133	unsigned long now;
	134
	135	/*
	136	* The actual_time register is read only so we write the offset
	137	* between it and linux time to the target_time register.
138	*/
139	ret = rtc_tm_to_time(tm, &now);
140	if (ret == 0)
141	out_be32(&regs->target_time, now - in_be32(&regs->actual_time));
142
143	/*
144	* update second minute hour registers
145	* so alarms will work
146	*/
147	mpc5121_rtc_update_smh(regs, tm);
148
149	return 0;
150	}
151
955dbea3 DES	152	static int mpc5200_rtc_read_time(struct device dev, struct rtc_time tm)
	153	{
	154	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	155	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	156	int tmp;
	157
	158	tm->tm_sec = in_8(&regs->second);
	159	tm->tm_min = in_8(&regs->minute);
	160
	161	/* 12 hour format? */
	162	if (in_8(&regs->hour) & 0x20)
	163	tm->tm_hour = (in_8(&regs->hour) >> 1) +
	164	(in_8(&regs->hour) & 1 ? 12 : 0);
	165	else
	166	tm->tm_hour = in_8(&regs->hour);
	167
	168	tmp = in_8(&regs->wday_mday);
	169	tm->tm_mday = tmp & 0x1f;
	170	tm->tm_mon = in_8(&regs->month) - 1;
	171	tm->tm_year = in_be16(&regs->year) - 1900;
	172	tm->tm_wday = (tmp >> 5) % 7;
	173	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	174	tm->tm_isdst = 0;
	175
	176	return 0;
	177	}
	178
	179	static int mpc5200_rtc_set_time(struct device dev, struct rtc_time tm)
	180	{
	181	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	182	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	183
	184	mpc5121_rtc_update_smh(regs, tm);
	185
	186	/* date */
	187	out_8(&regs->month_set, tm->tm_mon + 1);
	188	out_8(&regs->weekday_set, tm->tm_wday ? tm->tm_wday : 7);
	189	out_8(&regs->date_set, tm->tm_mday);
	190	out_be16(&regs->year_set, tm->tm_year + 1900);
	191
	192	/* set date sequence */
	193	out_8(&regs->set_date, 0x1);
	194	out_8(&regs->set_date, 0x3);
	195	out_8(&regs->set_date, 0x1);
	196	out_8(&regs->set_date, 0x0);
	197
	198	return 0;
	199	}
	200
50aae724 AG	201	static int mpc5121_rtc_read_alarm(struct device dev, struct rtc_wkalrm alarm)
	202	{
	203	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	204	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	205
	206	*alarm = rtc->wkalarm;
	207
	208	alarm->pending = in_8(&regs->alm_status);
	209
	210	return 0;
	211	}
	212
	213	static int mpc5121_rtc_set_alarm(struct device dev, struct rtc_wkalrm alarm)
	214	{
	215	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	216	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	217
	218	/*
	219	* the alarm has no seconds so deal with it
	220	*/
	221	if (alarm->time.tm_sec) {
	222	alarm->time.tm_sec = 0;
	223	alarm->time.tm_min++;
	224	if (alarm->time.tm_min >= 60) {
	225	alarm->time.tm_min = 0;
	226	alarm->time.tm_hour++;
	227	if (alarm->time.tm_hour >= 24)
	228	alarm->time.tm_hour = 0;
	229	}
	230	}
	231
	232	alarm->time.tm_mday = -1;
	233	alarm->time.tm_mon = -1;
	234	alarm->time.tm_year = -1;
	235
	236	out_8(&regs->alm_min_set, alarm->time.tm_min);
	237	out_8(&regs->alm_hour_set, alarm->time.tm_hour);
	238
	239	out_8(&regs->alm_enable, alarm->enabled);
	240
	241	rtc->wkalarm = *alarm;
	242	return 0;
	243	}
	244
	245	static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
	246	{
	247	struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
	248	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	249
	250	if (in_8(&regs->int_alm)) {
	251	/* acknowledge and clear status */
	252	out_8(&regs->int_alm, 1);
	253	out_8(&regs->alm_status, 1);
	254
	255	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	256	return IRQ_HANDLED;
	257	}
	258
	259	return IRQ_NONE;
	260	}
	261
	262	static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
	263	{
	264	struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
265	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
266
267	if (in_8(&regs->int_sec) && (in_8(&regs->int_enable) & 0x1)) {
268	/* acknowledge */
269	out_8(&regs->int_sec, 1);
270
271	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_UF);
272	return IRQ_HANDLED;
273	}
274
275	return IRQ_NONE;
276	}
277
278	static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
279	unsigned int enabled)
280	{
281	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
282	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
283	int val;
284
285	if (enabled)
286	val = 1;
287	else
288	val = 0;
289
290	out_8(&regs->alm_enable, val);
291	rtc->wkalarm.enabled = val;
292
293	return 0;
294	}
295
50aae724 AG	296	static const struct rtc_class_ops mpc5121_rtc_ops = {
	297	.read_time = mpc5121_rtc_read_time,
	298	.set_time = mpc5121_rtc_set_time,
	299	.read_alarm = mpc5121_rtc_read_alarm,
	300	.set_alarm = mpc5121_rtc_set_alarm,
	301	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
50aae724 AG	302	};
50aae724 AG	303
955dbea3 DES	304	static const struct rtc_class_ops mpc5200_rtc_ops = {
	305	.read_time = mpc5200_rtc_read_time,
	306	.set_time = mpc5200_rtc_set_time,
	307	.read_alarm = mpc5121_rtc_read_alarm,
	308	.set_alarm = mpc5121_rtc_set_alarm,
	309	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
	310	};
	311
5a167f45	312	static int mpc5121_rtc_probe(struct platform_device *op)
50aae724 AG	313	{
	314	struct mpc5121_rtc_data *rtc;
	315	int err = 0;
50aae724	316
073bf424	317	rtc = devm_kzalloc(&op->dev, sizeof(*rtc), GFP_KERNEL);
50aae724 AG	318	if (!rtc)
	319	return -ENOMEM;
	320
295bdd9c	321	rtc->regs = of_iomap(op->dev.of_node, 0);
50aae724 AG	322	if (!rtc->regs) {
50aae724 AG	323	dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
073bf424	324	return -ENOSYS;
50aae724 AG	325	}
	326
	327	device_init_wakeup(&op->dev, 1);
	328
ad87a766	329	platform_set_drvdata(op, rtc);
50aae724	330
295bdd9c	331	rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
2f6e5f94	332	err = request_irq(rtc->irq, mpc5121_rtc_handler, 0,
50aae724 AG	333	"mpc5121-rtc", &op->dev);
	334	if (err) {
	335	dev_err(&op->dev, "%s: could not request irq: %i\n",
	336	__func__, rtc->irq);
	337	goto out_dispose;
	338	}
	339
295bdd9c	340	rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
50aae724	341	err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
2f6e5f94	342	0, "mpc5121-rtc_upd", &op->dev);
50aae724 AG	343	if (err) {
	344	dev_err(&op->dev, "%s: could not request irq: %i\n",
	345	__func__, rtc->irq_periodic);
	346	goto out_dispose2;
	347	}
	348
955dbea3 DES	349	if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) {
	350	u32 ka;
	351	ka = in_be32(&rtc->regs->keep_alive);
	352	if (ka & 0x02) {
	353	dev_warn(&op->dev,
	354	"mpc5121-rtc: Battery or oscillator failure!\n");
	355	out_be32(&rtc->regs->keep_alive, ka);
	356	}
	357
073bf424	358	rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5121-rtc",
955dbea3 DES	359	&mpc5121_rtc_ops, THIS_MODULE);
955dbea3 DES	360	} else {
073bf424	361	rtc->rtc = devm_rtc_device_register(&op->dev, "mpc5200-rtc",
955dbea3	362	&mpc5200_rtc_ops, THIS_MODULE);
50aae724 AG	363	}
50aae724 AG	364
50aae724 AG	365	if (IS_ERR(rtc->rtc)) {
	366	err = PTR_ERR(rtc->rtc);
	367	goto out_free_irq;
	368	}
e48b5e82	369	rtc->rtc->uie_unsupported = 1;
50aae724 AG	370
	371	return 0;
	372
	373	out_free_irq:
	374	free_irq(rtc->irq_periodic, &op->dev);
	375	out_dispose2:
	376	irq_dispose_mapping(rtc->irq_periodic);
	377	free_irq(rtc->irq, &op->dev);
	378	out_dispose:
	379	irq_dispose_mapping(rtc->irq);
	380	iounmap(rtc->regs);
50aae724 AG	381
	382	return err;
	383	}
	384
5a167f45	385	static int mpc5121_rtc_remove(struct platform_device *op)
50aae724	386	{
ad87a766	387	struct mpc5121_rtc_data *rtc = platform_get_drvdata(op);
50aae724 AG	388	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	389
	390	/* disable interrupt, so there are no nasty surprises */
	391	out_8(&regs->alm_enable, 0);
	392	out_8(&regs->int_enable, in_8(&regs->int_enable) & ~0x1);
	393
50aae724 AG	394	iounmap(rtc->regs);
	395	free_irq(rtc->irq, &op->dev);
	396	free_irq(rtc->irq_periodic, &op->dev);
	397	irq_dispose_mapping(rtc->irq);
	398	irq_dispose_mapping(rtc->irq_periodic);
50aae724 AG	399
	400	return 0;
	401	}
	402
c8a6046e	403	#ifdef CONFIG_OF
a28885bc	404	static const struct of_device_id mpc5121_rtc_match[] = {
50aae724	405	{ .compatible = "fsl,mpc5121-rtc", },
955dbea3	406	{ .compatible = "fsl,mpc5200-rtc", },
50aae724 AG	407	{},
50aae724 AG	408	};
73798d5c	409	MODULE_DEVICE_TABLE(of, mpc5121_rtc_match);
c8a6046e	410	#endif
50aae724	411
1c48a5c9	412	static struct platform_driver mpc5121_rtc_driver = {
295bdd9c GL	413	.driver = {
295bdd9c GL	414	.name = "mpc5121-rtc",
c8a6046e	415	.of_match_table = of_match_ptr(mpc5121_rtc_match),
295bdd9c	416	},
50aae724	417	.probe = mpc5121_rtc_probe,
5a167f45	418	.remove = mpc5121_rtc_remove,
50aae724 AG	419	};
50aae724 AG	420
0c4eae66	421	module_platform_driver(mpc5121_rtc_driver);
50aae724 AG	422
	423	MODULE_LICENSE("GPL");
	424	MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");