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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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
 */

#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 0;
}

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 = devm_platform_ioremap_resource(op, 0);
	if (IS_ERR(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 = devm_request_irq(&op->dev, 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 = devm_request_irq(&op->dev, 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;
	}

	rtc->rtc = devm_rtc_allocate_device(&op->dev);
	if (IS_ERR(rtc->rtc)) {
		err = PTR_ERR(rtc->rtc);
		goto out_dispose2;
	}

	rtc->rtc->ops = &mpc5200_rtc_ops;
	rtc->rtc->uie_unsupported = 1;
	rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_0000;
	rtc->rtc->range_max = 65733206399ULL; /* 4052-12-31 23:59:59 */

	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->ops = &mpc5121_rtc_ops;
		/*
		 * This is a limitation of the driver that abuses the target
		 * time register, the actual maximum year for the mpc5121 is
		 * also 4052.
		 */
		rtc->rtc->range_min = 0;
		rtc->rtc->range_max = U32_MAX;
	}

	err = rtc_register_device(rtc->rtc);
	if (err)
		goto out_dispose2;

	return 0;

out_dispose2:
	irq_dispose_mapping(rtc->irq_periodic);
out_dispose:
	irq_dispose_mapping(rtc->irq);

	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);

	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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
50aae724 AG	2	/*
	3	* Real-time clock driver for MPC5121
	4	*
	5	* Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
	6	* Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
955dbea3	7	* Copyright 2011, Dmitry Eremin-Solenikov
50aae724 AG	8	*/
	9
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/rtc.h>
c8a6046e	13	#include <linux/of.h>
5af50730	14	#include <linux/of_address.h>
50aae724	15	#include <linux/of_device.h>
5af50730	16	#include <linux/of_irq.h>
50aae724 AG	17	#include <linux/of_platform.h>
50aae724 AG	18	#include <linux/io.h>
5a0e3ad6	19	#include <linux/slab.h>
50aae724 AG	20
	21	struct mpc5121_rtc_regs {
	22	u8 set_time; /* RTC + 0x00 */
	23	u8 hour_set; /* RTC + 0x01 */
	24	u8 minute_set; /* RTC + 0x02 */
	25	u8 second_set; /* RTC + 0x03 */
	26
	27	u8 set_date; /* RTC + 0x04 */
	28	u8 month_set; /* RTC + 0x05 */
	29	u8 weekday_set; /* RTC + 0x06 */
	30	u8 date_set; /* RTC + 0x07 */
	31
	32	u8 write_sw; /* RTC + 0x08 */
	33	u8 sw_set; /* RTC + 0x09 */
	34	u16 year_set; /* RTC + 0x0a */
	35
	36	u8 alm_enable; /* RTC + 0x0c */
	37	u8 alm_hour_set; /* RTC + 0x0d */
	38	u8 alm_min_set; /* RTC + 0x0e */
	39	u8 int_enable; /* RTC + 0x0f */
	40
	41	u8 reserved1;
	42	u8 hour; /* RTC + 0x11 */
	43	u8 minute; /* RTC + 0x12 */
	44	u8 second; /* RTC + 0x13 */
	45
	46	u8 month; /* RTC + 0x14 */
	47	u8 wday_mday; /* RTC + 0x15 */
	48	u16 year; /* RTC + 0x16 */
	49
	50	u8 int_alm; /* RTC + 0x18 */
	51	u8 int_sw; /* RTC + 0x19 */
	52	u8 alm_status; /* RTC + 0x1a */
	53	u8 sw_minute; /* RTC + 0x1b */
	54
	55	u8 bus_error_1; /* RTC + 0x1c */
	56	u8 int_day; /* RTC + 0x1d */
	57	u8 int_min; /* RTC + 0x1e */
	58	u8 int_sec; /* RTC + 0x1f */
	59
	60	/*
	61	* target_time:
	62	* intended to be used for hibernation but hibernation
	63	* does not work on silicon rev 1.5 so use it for non-volatile
	64	* storage of offset between the actual_time register and linux
	65	* time
	66	*/
	67	u32 target_time; /* RTC + 0x20 */
	68	/*
	69	* actual_time:
07d27f2d	70	* readonly time since VBAT_RTC was last connected
50aae724 AG	71	*/
	72	u32 actual_time; /* RTC + 0x24 */
	73	u32 keep_alive; /* RTC + 0x28 */
	74	};
	75
	76	struct mpc5121_rtc_data {
	77	unsigned irq;
	78	unsigned irq_periodic;
	79	struct mpc5121_rtc_regs __iomem *regs;
	80	struct rtc_device *rtc;
	81	struct rtc_wkalrm wkalarm;
	82	};
	83
	84	/*
	85	* Update second/minute/hour registers.
	86	*
	87	* This is just so alarm will work.
	88	*/
	89	static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
	90	struct rtc_time *tm)
	91	{
	92	out_8(&regs->second_set, tm->tm_sec);
	93	out_8(&regs->minute_set, tm->tm_min);
	94	out_8(&regs->hour_set, tm->tm_hour);
	95
	96	/* set time sequence */
	97	out_8(&regs->set_time, 0x1);
	98	out_8(&regs->set_time, 0x3);
	99	out_8(&regs->set_time, 0x1);
	100	out_8(&regs->set_time, 0x0);
	101	}
	102
	103	static int mpc5121_rtc_read_time(struct device dev, struct rtc_time tm)
	104	{
	105	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	106	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	107	unsigned long now;
	108
	109	/*
	110	* linux time is actual_time plus the offset saved in target_time
	111	*/
	112	now = in_be32(&regs->actual_time) + in_be32(&regs->target_time);
	113
	114	rtc_time_to_tm(now, tm);
	115
	116	/*
	117	* update second minute hour registers
	118	* so alarms will work
	119	*/
	120	mpc5121_rtc_update_smh(regs, tm);
	121
ab62670e	122	return 0;
50aae724 AG	123	}
	124
	125	static int mpc5121_rtc_set_time(struct device dev, struct rtc_time tm)
	126	{
	127	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	128	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	129	int ret;
	130	unsigned long now;
	131
	132	/*
	133	* The actual_time register is read only so we write the offset
	134	* between it and linux time to the target_time register.
	135	*/
	136	ret = rtc_tm_to_time(tm, &now);
	137	if (ret == 0)
	138	out_be32(&regs->target_time, now - in_be32(&regs->actual_time));
	139
	140	/*
	141	* update second minute hour registers
	142	* so alarms will work
	143	*/
	144	mpc5121_rtc_update_smh(regs, tm);
	145
	146	return 0;
	147	}
	148
955dbea3 DES	149	static int mpc5200_rtc_read_time(struct device dev, struct rtc_time tm)
	150	{
	151	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	152	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	153	int tmp;
	154
	155	tm->tm_sec = in_8(&regs->second);
	156	tm->tm_min = in_8(&regs->minute);
	157
	158	/* 12 hour format? */
	159	if (in_8(&regs->hour) & 0x20)
	160	tm->tm_hour = (in_8(&regs->hour) >> 1) +
	161	(in_8(&regs->hour) & 1 ? 12 : 0);
	162	else
	163	tm->tm_hour = in_8(&regs->hour);
	164
	165	tmp = in_8(&regs->wday_mday);
	166	tm->tm_mday = tmp & 0x1f;
	167	tm->tm_mon = in_8(&regs->month) - 1;
	168	tm->tm_year = in_be16(&regs->year) - 1900;
	169	tm->tm_wday = (tmp >> 5) % 7;
	170	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	171	tm->tm_isdst = 0;
	172
	173	return 0;
	174	}
	175
	176	static int mpc5200_rtc_set_time(struct device dev, struct rtc_time tm)
	177	{
	178	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	179	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	180
	181	mpc5121_rtc_update_smh(regs, tm);
	182
	183	/* date */
	184	out_8(&regs->month_set, tm->tm_mon + 1);
	185	out_8(&regs->weekday_set, tm->tm_wday ? tm->tm_wday : 7);
	186	out_8(&regs->date_set, tm->tm_mday);
	187	out_be16(&regs->year_set, tm->tm_year + 1900);
	188
	189	/* set date sequence */
	190	out_8(&regs->set_date, 0x1);
	191	out_8(&regs->set_date, 0x3);
	192	out_8(&regs->set_date, 0x1);
	193	out_8(&regs->set_date, 0x0);
	194
	195	return 0;
	196	}
	197
50aae724 AG	198	static int mpc5121_rtc_read_alarm(struct device dev, struct rtc_wkalrm alarm)
	199	{
	200	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	201	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	202
	203	*alarm = rtc->wkalarm;
	204
	205	alarm->pending = in_8(&regs->alm_status);
	206
	207	return 0;
	208	}
	209
	210	static int mpc5121_rtc_set_alarm(struct device dev, struct rtc_wkalrm alarm)
	211	{
	212	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
	213	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	214
	215	/*
	216	* the alarm has no seconds so deal with it
	217	*/
	218	if (alarm->time.tm_sec) {
	219	alarm->time.tm_sec = 0;
	220	alarm->time.tm_min++;
	221	if (alarm->time.tm_min >= 60) {
	222	alarm->time.tm_min = 0;
	223	alarm->time.tm_hour++;
	224	if (alarm->time.tm_hour >= 24)
	225	alarm->time.tm_hour = 0;
	226	}
	227	}
	228
	229	alarm->time.tm_mday = -1;
	230	alarm->time.tm_mon = -1;
	231	alarm->time.tm_year = -1;
	232
	233	out_8(&regs->alm_min_set, alarm->time.tm_min);
	234	out_8(&regs->alm_hour_set, alarm->time.tm_hour);
	235
	236	out_8(&regs->alm_enable, alarm->enabled);
	237
	238	rtc->wkalarm = *alarm;
	239	return 0;
	240	}
	241
	242	static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
	243	{
	244	struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
	245	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	246
	247	if (in_8(&regs->int_alm)) {
	248	/* acknowledge and clear status */
	249	out_8(&regs->int_alm, 1);
	250	out_8(&regs->alm_status, 1);
	251
	252	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
	253	return IRQ_HANDLED;
	254	}
	255
	256	return IRQ_NONE;
	257	}
	258
	259	static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
	260	{
	261	struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
262	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
263
264	if (in_8(&regs->int_sec) && (in_8(&regs->int_enable) & 0x1)) {
265	/* acknowledge */
266	out_8(&regs->int_sec, 1);
267
268	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_UF);
269	return IRQ_HANDLED;
270	}
271
272	return IRQ_NONE;
273	}
274
275	static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
276	unsigned int enabled)
277	{
278	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
279	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
280	int val;
281
282	if (enabled)
283	val = 1;
284	else
285	val = 0;
286
287	out_8(&regs->alm_enable, val);
288	rtc->wkalarm.enabled = val;
289
290	return 0;
291	}
292
50aae724 AG	293	static const struct rtc_class_ops mpc5121_rtc_ops = {
	294	.read_time = mpc5121_rtc_read_time,
	295	.set_time = mpc5121_rtc_set_time,
	296	.read_alarm = mpc5121_rtc_read_alarm,
	297	.set_alarm = mpc5121_rtc_set_alarm,
	298	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
50aae724 AG	299	};
50aae724 AG	300
955dbea3 DES	301	static const struct rtc_class_ops mpc5200_rtc_ops = {
	302	.read_time = mpc5200_rtc_read_time,
	303	.set_time = mpc5200_rtc_set_time,
	304	.read_alarm = mpc5121_rtc_read_alarm,
	305	.set_alarm = mpc5121_rtc_set_alarm,
	306	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
	307	};
	308
5a167f45	309	static int mpc5121_rtc_probe(struct platform_device *op)
50aae724 AG	310	{
	311	struct mpc5121_rtc_data *rtc;
	312	int err = 0;
50aae724	313
073bf424	314	rtc = devm_kzalloc(&op->dev, sizeof(*rtc), GFP_KERNEL);
50aae724 AG	315	if (!rtc)
	316	return -ENOMEM;
	317
d53d4ae9 AB	318	rtc->regs = devm_platform_ioremap_resource(op, 0);
d53d4ae9 AB	319	if (IS_ERR(rtc->regs)) {
50aae724	320	dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
073bf424	321	return -ENOSYS;
50aae724 AG	322	}
	323
	324	device_init_wakeup(&op->dev, 1);
	325
ad87a766	326	platform_set_drvdata(op, rtc);
50aae724	327
295bdd9c	328	rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
d53d4ae9 AB	329	err = devm_request_irq(&op->dev, rtc->irq, mpc5121_rtc_handler, 0,
d53d4ae9 AB	330	"mpc5121-rtc", &op->dev);
50aae724 AG	331	if (err) {
	332	dev_err(&op->dev, "%s: could not request irq: %i\n",
	333	__func__, rtc->irq);
	334	goto out_dispose;
	335	}
	336
295bdd9c	337	rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
d53d4ae9 AB	338	err = devm_request_irq(&op->dev, rtc->irq_periodic,
	339	mpc5121_rtc_handler_upd, 0, "mpc5121-rtc_upd",
	340	&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
fffbe10e AB	347	rtc->rtc = devm_rtc_allocate_device(&op->dev);
	348	if (IS_ERR(rtc->rtc)) {
	349	err = PTR_ERR(rtc->rtc);
	350	goto out_dispose2;
	351	}
	352
	353	rtc->rtc->ops = &mpc5200_rtc_ops;
	354	rtc->rtc->uie_unsupported = 1;
3905d1c0 AB	355	rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_0000;
3905d1c0 AB	356	rtc->rtc->range_max = 65733206399ULL; /* 4052-12-31 23:59:59 */
fffbe10e	357
955dbea3 DES	358	if (of_device_is_compatible(op->dev.of_node, "fsl,mpc5121-rtc")) {
	359	u32 ka;
	360	ka = in_be32(&rtc->regs->keep_alive);
	361	if (ka & 0x02) {
	362	dev_warn(&op->dev,
	363	"mpc5121-rtc: Battery or oscillator failure!\n");
	364	out_be32(&rtc->regs->keep_alive, ka);
	365	}
fffbe10e	366	rtc->rtc->ops = &mpc5121_rtc_ops;
3905d1c0 AB	367	/*
	368	* This is a limitation of the driver that abuses the target
	369	* time register, the actual maximum year for the mpc5121 is
	370	* also 4052.
	371	*/
	372	rtc->rtc->range_min = 0;
	373	rtc->rtc->range_max = U32_MAX;
50aae724 AG	374	}
50aae724 AG	375
fffbe10e AB	376	err = rtc_register_device(rtc->rtc);
fffbe10e AB	377	if (err)
d53d4ae9	378	goto out_dispose2;
50aae724 AG	379
	380	return 0;
	381
50aae724 AG	382	out_dispose2:
50aae724 AG	383	irq_dispose_mapping(rtc->irq_periodic);
50aae724 AG	384	out_dispose:
50aae724 AG	385	irq_dispose_mapping(rtc->irq);
50aae724 AG	386
	387	return err;
	388	}
	389
5a167f45	390	static int mpc5121_rtc_remove(struct platform_device *op)
50aae724	391	{
ad87a766	392	struct mpc5121_rtc_data *rtc = platform_get_drvdata(op);
50aae724 AG	393	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	394
	395	/* disable interrupt, so there are no nasty surprises */
	396	out_8(&regs->alm_enable, 0);
	397	out_8(&regs->int_enable, in_8(&regs->int_enable) & ~0x1);
	398
50aae724 AG	399	irq_dispose_mapping(rtc->irq);
50aae724 AG	400	irq_dispose_mapping(rtc->irq_periodic);
50aae724 AG	401
	402	return 0;
	403	}
	404
c8a6046e	405	#ifdef CONFIG_OF
a28885bc	406	static const struct of_device_id mpc5121_rtc_match[] = {
50aae724	407	{ .compatible = "fsl,mpc5121-rtc", },
955dbea3	408	{ .compatible = "fsl,mpc5200-rtc", },
50aae724 AG	409	{},
50aae724 AG	410	};
73798d5c	411	MODULE_DEVICE_TABLE(of, mpc5121_rtc_match);
c8a6046e	412	#endif
50aae724	413
1c48a5c9	414	static struct platform_driver mpc5121_rtc_driver = {
295bdd9c GL	415	.driver = {
295bdd9c GL	416	.name = "mpc5121-rtc",
c8a6046e	417	.of_match_table = of_match_ptr(mpc5121_rtc_match),
295bdd9c	418	},
50aae724	419	.probe = mpc5121_rtc_probe,
5a167f45	420	.remove = mpc5121_rtc_remove,
50aae724 AG	421	};
50aae724 AG	422
0c4eae66	423	module_platform_driver(mpc5121_rtc_driver);
50aae724 AG	424
	425	MODULE_LICENSE("GPL");
	426	MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");