[GitHub/mt8127/android_kernel_alcatel_ttab.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.
 *
 * 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 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 int mpc5121_rtc_update_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;

	val = in_8(&regs->int_enable);

	if (enabled)
		val = (val & ~0x8) | 0x1;
	else
		val &= ~0x1;

	out_8(&regs->int_enable, 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,
	.update_irq_enable = mpc5121_rtc_update_irq_enable,
};

static int __devinit mpc5121_rtc_probe(struct of_device *op,
					const struct of_device_id *match)
{
	struct mpc5121_rtc_data *rtc;
	int err = 0;
	u32 ka;

	rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	rtc->regs = of_iomap(op->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->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->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;
	}

	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);
	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 of_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", },
	{},
};

static struct of_platform_driver mpc5121_rtc_driver = {
	.owner = THIS_MODULE,
	.name = "mpc5121-rtc",
	.match_table = mpc5121_rtc_match,
	.probe = mpc5121_rtc_probe,
	.remove = __devexit_p(mpc5121_rtc_remove),
};

static int __init mpc5121_rtc_init(void)
{
	return of_register_platform_driver(&mpc5121_rtc_driver);
}
module_init(mpc5121_rtc_init);

static void __exit mpc5121_rtc_exit(void)
{
	of_unregister_platform_driver(&mpc5121_rtc_driver);
}
module_exit(mpc5121_rtc_exit);

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.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/rtc.h>
	15	#include <linux/of_device.h>
	16	#include <linux/of_platform.h>
	17	#include <linux/io.h>
5a0e3ad6	18	#include <linux/slab.h>
50aae724 AG	19
	20	struct mpc5121_rtc_regs {
	21	u8 set_time; /* RTC + 0x00 */
	22	u8 hour_set; /* RTC + 0x01 */
	23	u8 minute_set; /* RTC + 0x02 */
	24	u8 second_set; /* RTC + 0x03 */
	25
	26	u8 set_date; /* RTC + 0x04 */
	27	u8 month_set; /* RTC + 0x05 */
	28	u8 weekday_set; /* RTC + 0x06 */
	29	u8 date_set; /* RTC + 0x07 */
	30
	31	u8 write_sw; /* RTC + 0x08 */
	32	u8 sw_set; /* RTC + 0x09 */
	33	u16 year_set; /* RTC + 0x0a */
	34
	35	u8 alm_enable; /* RTC + 0x0c */
	36	u8 alm_hour_set; /* RTC + 0x0d */
	37	u8 alm_min_set; /* RTC + 0x0e */
	38	u8 int_enable; /* RTC + 0x0f */
	39
	40	u8 reserved1;
	41	u8 hour; /* RTC + 0x11 */
	42	u8 minute; /* RTC + 0x12 */
	43	u8 second; /* RTC + 0x13 */
	44
	45	u8 month; /* RTC + 0x14 */
	46	u8 wday_mday; /* RTC + 0x15 */
	47	u16 year; /* RTC + 0x16 */
	48
	49	u8 int_alm; /* RTC + 0x18 */
	50	u8 int_sw; /* RTC + 0x19 */
	51	u8 alm_status; /* RTC + 0x1a */
	52	u8 sw_minute; /* RTC + 0x1b */
	53
	54	u8 bus_error_1; /* RTC + 0x1c */
	55	u8 int_day; /* RTC + 0x1d */
	56	u8 int_min; /* RTC + 0x1e */
	57	u8 int_sec; /* RTC + 0x1f */
	58
	59	/*
	60	* target_time:
	61	* intended to be used for hibernation but hibernation
	62	* does not work on silicon rev 1.5 so use it for non-volatile
	63	* storage of offset between the actual_time register and linux
	64	* time
	65	*/
	66	u32 target_time; /* RTC + 0x20 */
	67	/*
	68	* actual_time:
	69	* readonly time since VBAT_RTC was last connected
	70	*/
	71	u32 actual_time; /* RTC + 0x24 */
	72	u32 keep_alive; /* RTC + 0x28 */
	73	};
	74
	75	struct mpc5121_rtc_data {
	76	unsigned irq;
	77	unsigned irq_periodic;
	78	struct mpc5121_rtc_regs __iomem *regs;
	79	struct rtc_device *rtc;
	80	struct rtc_wkalrm wkalarm;
	81	};
	82
83	/*
84	* Update second/minute/hour registers.
85	*
86	* This is just so alarm will work.
87	*/
88	static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
89	struct rtc_time *tm)
90	{
91	out_8(&regs->second_set, tm->tm_sec);
92	out_8(&regs->minute_set, tm->tm_min);
93	out_8(&regs->hour_set, tm->tm_hour);
94
95	/* set time sequence */
96	out_8(&regs->set_time, 0x1);
97	out_8(&regs->set_time, 0x3);
98	out_8(&regs->set_time, 0x1);
99	out_8(&regs->set_time, 0x0);
100	}
101
102	static int mpc5121_rtc_read_time(struct device dev, struct rtc_time tm)
103	{
104	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
105	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
106	unsigned long now;
107
108	/*
109	* linux time is actual_time plus the offset saved in target_time
110	*/
111	now = in_be32(&regs->actual_time) + in_be32(&regs->target_time);
112
113	rtc_time_to_tm(now, tm);
114
115	/*
116	* update second minute hour registers
117	* so alarms will work
118	*/
119	mpc5121_rtc_update_smh(regs, tm);
120
121	return rtc_valid_tm(tm);
122	}
123
124	static int mpc5121_rtc_set_time(struct device dev, struct rtc_time tm)
125	{
126	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
127	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
128	int ret;
129	unsigned long now;
130
131	/*
132	* The actual_time register is read only so we write the offset
133	* between it and linux time to the target_time register.
134	*/
135	ret = rtc_tm_to_time(tm, &now);
136	if (ret == 0)
137	out_be32(&regs->target_time, now - in_be32(&regs->actual_time));
138
139	/*
140	* update second minute hour registers
141	* so alarms will work
142	*/
143	mpc5121_rtc_update_smh(regs, tm);
144
145	return 0;
146	}
147
148	static int mpc5121_rtc_read_alarm(struct device dev, struct rtc_wkalrm alarm)
149	{
150	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
151	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
152
153	*alarm = rtc->wkalarm;
154
155	alarm->pending = in_8(&regs->alm_status);
156
157	return 0;
158	}
159
160	static int mpc5121_rtc_set_alarm(struct device dev, struct rtc_wkalrm alarm)
161	{
162	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
163	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
164
165	/*
166	* the alarm has no seconds so deal with it
167	*/
168	if (alarm->time.tm_sec) {
169	alarm->time.tm_sec = 0;
170	alarm->time.tm_min++;
171	if (alarm->time.tm_min >= 60) {
172	alarm->time.tm_min = 0;
173	alarm->time.tm_hour++;
174	if (alarm->time.tm_hour >= 24)
175	alarm->time.tm_hour = 0;
176	}
177	}
178
179	alarm->time.tm_mday = -1;
180	alarm->time.tm_mon = -1;
181	alarm->time.tm_year = -1;
182
183	out_8(&regs->alm_min_set, alarm->time.tm_min);
184	out_8(&regs->alm_hour_set, alarm->time.tm_hour);
185
186	out_8(&regs->alm_enable, alarm->enabled);
187
188	rtc->wkalarm = *alarm;
189	return 0;
190	}
191
192	static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
193	{
194	struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
195	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
196
197	if (in_8(&regs->int_alm)) {
198	/* acknowledge and clear status */
199	out_8(&regs->int_alm, 1);
200	out_8(&regs->alm_status, 1);
201
202	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_AF);
203	return IRQ_HANDLED;
204	}
205
206	return IRQ_NONE;
207	}
208
209	static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
210	{
211	struct mpc5121_rtc_data rtc = dev_get_drvdata((struct device )dev);
212	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
213
214	if (in_8(&regs->int_sec) && (in_8(&regs->int_enable) & 0x1)) {
215	/* acknowledge */
216	out_8(&regs->int_sec, 1);
217
218	rtc_update_irq(rtc->rtc, 1, RTC_IRQF \| RTC_UF);
219	return IRQ_HANDLED;
220	}
221
222	return IRQ_NONE;
223	}
224
225	static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
226	unsigned int enabled)
227	{
228	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
229	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
230	int val;
231
232	if (enabled)
233	val = 1;
234	else
235	val = 0;
236
237	out_8(&regs->alm_enable, val);
238	rtc->wkalarm.enabled = val;
239
240	return 0;
241	}
242
243	static int mpc5121_rtc_update_irq_enable(struct device *dev,
244	unsigned int enabled)
245	{
246	struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
247	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
248	int val;
249
250	val = in_8(&regs->int_enable);
251
252	if (enabled)
253	val = (val & ~0x8) \| 0x1;
254	else
255	val &= ~0x1;
256
257	out_8(&regs->int_enable, val);
258
259	return 0;
260	}
261
262	static const struct rtc_class_ops mpc5121_rtc_ops = {
263	.read_time = mpc5121_rtc_read_time,
264	.set_time = mpc5121_rtc_set_time,
265	.read_alarm = mpc5121_rtc_read_alarm,
266	.set_alarm = mpc5121_rtc_set_alarm,
267	.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
268	.update_irq_enable = mpc5121_rtc_update_irq_enable,
269	};
270
271	static int __devinit mpc5121_rtc_probe(struct of_device *op,
272	const struct of_device_id *match)
273	{
274	struct mpc5121_rtc_data *rtc;
275	int err = 0;
276	u32 ka;
277
278	rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
279	if (!rtc)
280	return -ENOMEM;
281
282	rtc->regs = of_iomap(op->node, 0);
283	if (!rtc->regs) {
284	dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
285	err = -ENOSYS;
286	goto out_free;
287	}
288
289	device_init_wakeup(&op->dev, 1);
290
291	dev_set_drvdata(&op->dev, rtc);
292
293	rtc->irq = irq_of_parse_and_map(op->node, 1);
294	err = request_irq(rtc->irq, mpc5121_rtc_handler, IRQF_DISABLED,
295	"mpc5121-rtc", &op->dev);
296	if (err) {
297	dev_err(&op->dev, "%s: could not request irq: %i\n",
298	__func__, rtc->irq);
299	goto out_dispose;
300	}
301
302	rtc->irq_periodic = irq_of_parse_and_map(op->node, 0);
303	err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
304	IRQF_DISABLED, "mpc5121-rtc_upd", &op->dev);
305	if (err) {
306	dev_err(&op->dev, "%s: could not request irq: %i\n",
307	__func__, rtc->irq_periodic);
308	goto out_dispose2;
309	}
310
311	ka = in_be32(&rtc->regs->keep_alive);
312	if (ka & 0x02) {
313	dev_warn(&op->dev,
314	"mpc5121-rtc: Battery or oscillator failure!\n");
315	out_be32(&rtc->regs->keep_alive, ka);
316	}
317
318	rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev,
319	&mpc5121_rtc_ops, THIS_MODULE);
320	if (IS_ERR(rtc->rtc)) {
321	err = PTR_ERR(rtc->rtc);
322	goto out_free_irq;
323	}
324
325	return 0;
326
327	out_free_irq:
328	free_irq(rtc->irq_periodic, &op->dev);
329	out_dispose2:
330	irq_dispose_mapping(rtc->irq_periodic);
331	free_irq(rtc->irq, &op->dev);
332	out_dispose:
333	irq_dispose_mapping(rtc->irq);
334	iounmap(rtc->regs);
335	out_free:
336	kfree(rtc);
337
338	return err;
339	}
340
341	static int __devexit mpc5121_rtc_remove(struct of_device *op)
342	{
343	struct mpc5121_rtc_data *rtc = dev_get_drvdata(&op->dev);
344	struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
345
346	/* disable interrupt, so there are no nasty surprises */
347	out_8(&regs->alm_enable, 0);
348	out_8(&regs->int_enable, in_8(&regs->int_enable) & ~0x1);
349
350	rtc_device_unregister(rtc->rtc);
351	iounmap(rtc->regs);
352	free_irq(rtc->irq, &op->dev);
353	free_irq(rtc->irq_periodic, &op->dev);
354	irq_dispose_mapping(rtc->irq);
355	irq_dispose_mapping(rtc->irq_periodic);
356	dev_set_drvdata(&op->dev, NULL);
357	kfree(rtc);
358
359	return 0;
360	}
361
362	static struct of_device_id mpc5121_rtc_match[] __devinitdata = {
363	{ .compatible = "fsl,mpc5121-rtc", },
364	{},
365	};
366
367	static struct of_platform_driver mpc5121_rtc_driver = {
368	.owner = THIS_MODULE,
369	.name = "mpc5121-rtc",
370	.match_table = mpc5121_rtc_match,
371	.probe = mpc5121_rtc_probe,
372	.remove = __devexit_p(mpc5121_rtc_remove),
373	};
374
375	static int __init mpc5121_rtc_init(void)
376	{
377	return of_register_platform_driver(&mpc5121_rtc_driver);
378	}
379	module_init(mpc5121_rtc_init);
380
381	static void __exit mpc5121_rtc_exit(void)
382	{
383	of_unregister_platform_driver(&mpc5121_rtc_driver);
384	}
385	module_exit(mpc5121_rtc_exit);
386
387	MODULE_LICENSE("GPL");
388	MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");