[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_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 __devinit mpc5121_rtc_probe(struct platform_device *op)
{
	struct mpc5121_rtc_data *rtc;
	int err = 0;

	rtc = kzalloc(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__);
		err = -ENOSYS;
		goto out_free;
	}

	device_init_wakeup(&op->dev, 1);

	dev_set_drvdata(&op->dev, rtc);

	rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
	err = request_irq(rtc->irq, mpc5121_rtc_handler, IRQF_DISABLED,
						"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,
				IRQF_DISABLED, "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 = rtc_device_register("mpc5121-rtc", &op->dev,
						&mpc5121_rtc_ops, THIS_MODULE);
	} else {
		rtc->rtc = rtc_device_register("mpc5200-rtc", &op->dev,
						&mpc5200_rtc_ops, THIS_MODULE);
	}

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

	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);
out_free:
	kfree(rtc);

	return err;
}

static int __devexit mpc5121_rtc_remove(struct platform_device *op)
{
	struct mpc5121_rtc_data *rtc = dev_get_drvdata(&op->dev);
	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);

	rtc_device_unregister(rtc->rtc);
	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);
	dev_set_drvdata(&op->dev, NULL);
	kfree(rtc);

	return 0;
}

static struct of_device_id mpc5121_rtc_match[] __devinitdata = {
	{ .compatible = "fsl,mpc5121-rtc", },
	{ .compatible = "fsl,mpc5200-rtc", },
	{},
};

static struct platform_driver mpc5121_rtc_driver = {
	.driver = {
		.name = "mpc5121-rtc",
		.owner = THIS_MODULE,
		.of_match_table = mpc5121_rtc_match,
	},
	.probe = mpc5121_rtc_probe,
	.remove = __devexit_p(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>
	16	#include <linux/of_device.h>
	17	#include <linux/of_platform.h>
	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:
	70	* readonly time since VBAT_RTC was last connected
	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
122	return rtc_valid_tm(tm);
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
1c48a5c9	309	static int __devinit mpc5121_rtc_probe(struct platform_device *op)
50aae724 AG	310	{
	311	struct mpc5121_rtc_data *rtc;
	312	int err = 0;
50aae724 AG	313
	314	rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
	315	if (!rtc)
	316	return -ENOMEM;
	317
295bdd9c	318	rtc->regs = of_iomap(op->dev.of_node, 0);
50aae724 AG	319	if (!rtc->regs) {
	320	dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
	321	err = -ENOSYS;
	322	goto out_free;
	323	}
	324
	325	device_init_wakeup(&op->dev, 1);
	326
	327	dev_set_drvdata(&op->dev, rtc);
	328
295bdd9c	329	rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
50aae724 AG	330	err = request_irq(rtc->irq, mpc5121_rtc_handler, IRQF_DISABLED,
	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 AG	339	err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
	340	IRQF_DISABLED, "mpc5121-rtc_upd", &op->dev);
	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
	356	rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev,
	357	&mpc5121_rtc_ops, THIS_MODULE);
	358	} else {
	359	rtc->rtc = rtc_device_register("mpc5200-rtc", &op->dev,
	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	}
	367
	368	return 0;
	369
	370	out_free_irq:
	371	free_irq(rtc->irq_periodic, &op->dev);
	372	out_dispose2:
	373	irq_dispose_mapping(rtc->irq_periodic);
	374	free_irq(rtc->irq, &op->dev);
	375	out_dispose:
	376	irq_dispose_mapping(rtc->irq);
	377	iounmap(rtc->regs);
	378	out_free:
	379	kfree(rtc);
	380
	381	return err;
	382	}
	383
2dc11581	384	static int __devexit mpc5121_rtc_remove(struct platform_device *op)
50aae724 AG	385	{
	386	struct mpc5121_rtc_data *rtc = dev_get_drvdata(&op->dev);
	387	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
	388
	389	/* disable interrupt, so there are no nasty surprises */
	390	out_8(&regs->alm_enable, 0);
	391	out_8(&regs->int_enable, in_8(&regs->int_enable) & ~0x1);
	392
	393	rtc_device_unregister(rtc->rtc);
	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);
	399	dev_set_drvdata(&op->dev, NULL);
	400	kfree(rtc);
	401
	402	return 0;
	403	}
	404
	405	static struct of_device_id mpc5121_rtc_match[] __devinitdata = {
	406	{ .compatible = "fsl,mpc5121-rtc", },
955dbea3	407	{ .compatible = "fsl,mpc5200-rtc", },
50aae724 AG	408	{},
	409	};
	410
1c48a5c9	411	static struct platform_driver mpc5121_rtc_driver = {
295bdd9c GL	412	.driver = {
	413	.name = "mpc5121-rtc",
	414	.owner = THIS_MODULE,
	415	.of_match_table = mpc5121_rtc_match,
	416	},
50aae724 AG	417	.probe = mpc5121_rtc_probe,
	418	.remove = __devexit_p(mpc5121_rtc_remove),
	419	};
	420
0c4eae66	421	module_platform_driver(mpc5121_rtc_driver);
50aae724 AG	422
	423	MODULE_LICENSE("GPL");
	424	MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");