[deliverable/linux.git] / drivers / rtc / rtc-stmp3xxx.c

/*
 * Freescale STMP37XX/STMP378X Real Time Clock driver
 *
 * Copyright (c) 2007 Sigmatel, Inc.
 * Peter Hartley, <peter.hartley@sigmatel.com>
 *
 * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/slab.h>

#include <mach/common.h>
#include <mach/mxs.h>

#define STMP3XXX_RTC_CTRL			0x0
#define STMP3XXX_RTC_CTRL_ALARM_IRQ_EN		0x00000001
#define STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN	0x00000002
#define STMP3XXX_RTC_CTRL_ALARM_IRQ		0x00000004
#define STMP3XXX_RTC_CTRL_ONEMSEC_IRQ		0x00000008

#define STMP3XXX_RTC_STAT			0x10
#define STMP3XXX_RTC_STAT_STALE_SHIFT		16
#define STMP3XXX_RTC_STAT_RTC_PRESENT		0x80000000

#define STMP3XXX_RTC_SECONDS			0x30

#define STMP3XXX_RTC_ALARM			0x40

#define STMP3XXX_RTC_PERSISTENT0		0x60
#define STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN	0x00000002
#define STMP3XXX_RTC_PERSISTENT0_ALARM_EN	0x00000004
#define STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE	0x00000080

struct stmp3xxx_rtc_data {
	struct rtc_device *rtc;
	unsigned irq_count;
	void __iomem *io;
	int irq_alarm, irq_1msec;
};

static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
{
	/*
	 * The datasheet doesn't say which way round the
	 * NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0,
	 * 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS
	 */
	while (__raw_readl(rtc_data->io + STMP3XXX_RTC_STAT) &
			(0x80 << STMP3XXX_RTC_STAT_STALE_SHIFT))
		cpu_relax();
}

/* Time read/write */
static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	stmp3xxx_wait_time(rtc_data);
	rtc_time_to_tm(__raw_readl(rtc_data->io + STMP3XXX_RTC_SECONDS),
			rtc_tm);
	return 0;
}

static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t)
{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	__raw_writel(t, rtc_data->io + STMP3XXX_RTC_SECONDS);
	stmp3xxx_wait_time(rtc_data);
	return 0;
}

/* interrupt(s) handler */
static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id)
{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id);
	u32 status;
	u32 events = 0;

	status = __raw_readl(rtc_data->io + STMP3XXX_RTC_CTRL) &
			(STMP3XXX_RTC_CTRL_ALARM_IRQ |
			 STMP3XXX_RTC_CTRL_ONEMSEC_IRQ);

	if (status & STMP3XXX_RTC_CTRL_ALARM_IRQ) {
		__mxs_clrl(STMP3XXX_RTC_CTRL_ALARM_IRQ,
				rtc_data->io + STMP3XXX_RTC_CTRL);
		events |= RTC_AF | RTC_IRQF;
	}

	if (status & STMP3XXX_RTC_CTRL_ONEMSEC_IRQ) {
		__mxs_clrl(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ,
				rtc_data->io + STMP3XXX_RTC_CTRL);
		if (++rtc_data->irq_count % 1000 == 0) {
			events |= RTC_UF | RTC_IRQF;
			rtc_data->irq_count = 0;
		}
	}

	if (events)
		rtc_update_irq(rtc_data->rtc, 1, events);

	return IRQ_HANDLED;
}

static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
	void __iomem *p = rtc_data->io + STMP3XXX_RTC_PERSISTENT0,
		     *ctl = rtc_data->io + STMP3XXX_RTC_CTRL;

	if (enabled) {
		__mxs_setl(STMP3XXX_RTC_PERSISTENT0_ALARM_EN |
			      STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
		__mxs_setl(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, ctl);
	} else {
		__mxs_clrl(STMP3XXX_RTC_PERSISTENT0_ALARM_EN |
			      STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
		__mxs_clrl(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, ctl);
	}
	return 0;
}

static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	rtc_time_to_tm(__raw_readl(rtc_data->io + STMP3XXX_RTC_ALARM),
			&alm->time);
	return 0;
}

static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	unsigned long t;
	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);

	rtc_tm_to_time(&alm->time, &t);
	__raw_writel(t, rtc_data->io + STMP3XXX_RTC_ALARM);
	return 0;
}

static struct rtc_class_ops stmp3xxx_rtc_ops = {
	.alarm_irq_enable =
			  stmp3xxx_alarm_irq_enable,
	.read_time	= stmp3xxx_rtc_gettime,
	.set_mmss	= stmp3xxx_rtc_set_mmss,
	.read_alarm	= stmp3xxx_rtc_read_alarm,
	.set_alarm	= stmp3xxx_rtc_set_alarm,
};

static int stmp3xxx_rtc_remove(struct platform_device *pdev)
{
	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev);

	if (!rtc_data)
		return 0;

	__mxs_clrl(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN |
			STMP3XXX_RTC_CTRL_ALARM_IRQ_EN,
			rtc_data->io + STMP3XXX_RTC_CTRL);
	free_irq(rtc_data->irq_alarm, &pdev->dev);
	free_irq(rtc_data->irq_1msec, &pdev->dev);
	rtc_device_unregister(rtc_data->rtc);
	iounmap(rtc_data->io);
	kfree(rtc_data);

	return 0;
}

static int stmp3xxx_rtc_probe(struct platform_device *pdev)
{
	struct stmp3xxx_rtc_data *rtc_data;
	struct resource *r;
	int err;

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

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
		dev_err(&pdev->dev, "failed to get resource\n");
		err = -ENXIO;
		goto out_free;
	}

	rtc_data->io = ioremap(r->start, resource_size(r));
	if (!rtc_data->io) {
		dev_err(&pdev->dev, "ioremap failed\n");
		err = -EIO;
		goto out_free;
	}

	rtc_data->irq_alarm = platform_get_irq(pdev, 0);
	rtc_data->irq_1msec = platform_get_irq(pdev, 1);

	if (!(__raw_readl(STMP3XXX_RTC_STAT + rtc_data->io) &
			STMP3XXX_RTC_STAT_RTC_PRESENT)) {
		dev_err(&pdev->dev, "no device onboard\n");
		err = -ENODEV;
		goto out_remap;
	}

	mxs_reset_block(rtc_data->io);
	__mxs_clrl(STMP3XXX_RTC_PERSISTENT0_ALARM_EN |
			STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN |
			STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE,
			rtc_data->io + STMP3XXX_RTC_PERSISTENT0);
	rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
				&stmp3xxx_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc_data->rtc)) {
		err = PTR_ERR(rtc_data->rtc);
		goto out_remap;
	}

	rtc_data->irq_count = 0;
	err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt,
			IRQF_DISABLED, "RTC alarm", &pdev->dev);
	if (err) {
		dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
			rtc_data->irq_alarm);
		goto out_irq_alarm;
	}
	err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt,
			IRQF_DISABLED, "RTC tick", &pdev->dev);
	if (err) {
		dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
			rtc_data->irq_1msec);
		goto out_irq1;
	}

	platform_set_drvdata(pdev, rtc_data);

	return 0;

out_irq1:
	free_irq(rtc_data->irq_alarm, &pdev->dev);
out_irq_alarm:
	__mxs_clrl(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN |
			STMP3XXX_RTC_CTRL_ALARM_IRQ_EN,
			rtc_data->io + STMP3XXX_RTC_CTRL);
	rtc_device_unregister(rtc_data->rtc);
out_remap:
	iounmap(rtc_data->io);
out_free:
	kfree(rtc_data);
	return err;
}

#ifdef CONFIG_PM
static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state)
{
	return 0;
}

static int stmp3xxx_rtc_resume(struct platform_device *dev)
{
	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev);

	mxs_reset_block(rtc_data->io);
	__mxs_clrl(STMP3XXX_RTC_PERSISTENT0_ALARM_EN |
			STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN |
			STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE,
			rtc_data->io + STMP3XXX_RTC_PERSISTENT0);
	return 0;
}
#else
#define stmp3xxx_rtc_suspend	NULL
#define stmp3xxx_rtc_resume	NULL
#endif

static struct platform_driver stmp3xxx_rtcdrv = {
	.probe		= stmp3xxx_rtc_probe,
	.remove		= stmp3xxx_rtc_remove,
	.suspend	= stmp3xxx_rtc_suspend,
	.resume		= stmp3xxx_rtc_resume,
	.driver		= {
		.name	= "stmp3xxx-rtc",
		.owner	= THIS_MODULE,
	},
};

static int __init stmp3xxx_rtc_init(void)
{
	return platform_driver_register(&stmp3xxx_rtcdrv);
}

static void __exit stmp3xxx_rtc_exit(void)
{
	platform_driver_unregister(&stmp3xxx_rtcdrv);
}

module_init(stmp3xxx_rtc_init);
module_exit(stmp3xxx_rtc_exit);

MODULE_DESCRIPTION("STMP3xxx RTC Driver");
MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
df17f631	1	/*
	2	* Freescale STMP37XX/STMP378X Real Time Clock driver
	3	*
	4	* Copyright (c) 2007 Sigmatel, Inc.
	5	* Peter Hartley, <peter.hartley@sigmatel.com>
	6	*
	7	* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
	8	* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
	9	*/
	10
	11	/*
	12	* The code contained herein is licensed under the GNU General Public
	13	* License. You may obtain a copy of the GNU General Public License
	14	* Version 2 or later at the following locations:
	15	*
	16	* http://www.opensource.org/licenses/gpl-license.html
	17	* http://www.gnu.org/copyleft/gpl.html
	18	*/
	19	#include <linux/kernel.h>
	20	#include <linux/module.h>
	21	#include <linux/init.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/rtc.h>
5a0e3ad6	25	#include <linux/slab.h>
df17f631	26
46b21218 WS	27	#include <mach/common.h>
46b21218 WS	28	#include <mach/mxs.h>
47eac337 WS	29
	30	#define STMP3XXX_RTC_CTRL 0x0
	31	#define STMP3XXX_RTC_CTRL_ALARM_IRQ_EN 0x00000001
	32	#define STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN 0x00000002
	33	#define STMP3XXX_RTC_CTRL_ALARM_IRQ 0x00000004
	34	#define STMP3XXX_RTC_CTRL_ONEMSEC_IRQ 0x00000008
	35
	36	#define STMP3XXX_RTC_STAT 0x10
	37	#define STMP3XXX_RTC_STAT_STALE_SHIFT 16
	38	#define STMP3XXX_RTC_STAT_RTC_PRESENT 0x80000000
	39
	40	#define STMP3XXX_RTC_SECONDS 0x30
	41
	42	#define STMP3XXX_RTC_ALARM 0x40
	43
	44	#define STMP3XXX_RTC_PERSISTENT0 0x60
	45	#define STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN 0x00000002
	46	#define STMP3XXX_RTC_PERSISTENT0_ALARM_EN 0x00000004
	47	#define STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE 0x00000080
df17f631	48
	49	struct stmp3xxx_rtc_data {
	50	struct rtc_device *rtc;
	51	unsigned irq_count;
	52	void __iomem *io;
	53	int irq_alarm, irq_1msec;
	54	};
	55
	56	static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
	57	{
	58	/*
	59	* The datasheet doesn't say which way round the
	60	* NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0,
	61	* 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS
	62	*/
47eac337 WS	63	while (__raw_readl(rtc_data->io + STMP3XXX_RTC_STAT) &
47eac337 WS	64	(0x80 << STMP3XXX_RTC_STAT_STALE_SHIFT))
df17f631	65	cpu_relax();
	66	}
	67
	68	/* Time read/write */
	69	static int stmp3xxx_rtc_gettime(struct device dev, struct rtc_time rtc_tm)
	70	{
	71	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
	72
	73	stmp3xxx_wait_time(rtc_data);
47eac337 WS	74	rtc_time_to_tm(__raw_readl(rtc_data->io + STMP3XXX_RTC_SECONDS),
47eac337 WS	75	rtc_tm);
df17f631	76	return 0;
	77	}
	78
	79	static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t)
	80	{
	81	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
	82
47eac337	83	__raw_writel(t, rtc_data->io + STMP3XXX_RTC_SECONDS);
df17f631	84	stmp3xxx_wait_time(rtc_data);
	85	return 0;
	86	}
	87
	88	/* interrupt(s) handler */
	89	static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id)
	90	{
	91	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id);
	92	u32 status;
	93	u32 events = 0;
	94
47eac337 WS	95	status = __raw_readl(rtc_data->io + STMP3XXX_RTC_CTRL) &
	96	(STMP3XXX_RTC_CTRL_ALARM_IRQ \|
	97	STMP3XXX_RTC_CTRL_ONEMSEC_IRQ);
df17f631	98
47eac337	99	if (status & STMP3XXX_RTC_CTRL_ALARM_IRQ) {
46b21218	100	__mxs_clrl(STMP3XXX_RTC_CTRL_ALARM_IRQ,
47eac337	101	rtc_data->io + STMP3XXX_RTC_CTRL);
df17f631	102	events \|= RTC_AF \| RTC_IRQF;
	103	}
	104
47eac337	105	if (status & STMP3XXX_RTC_CTRL_ONEMSEC_IRQ) {
46b21218	106	__mxs_clrl(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ,
47eac337	107	rtc_data->io + STMP3XXX_RTC_CTRL);
df17f631	108	if (++rtc_data->irq_count % 1000 == 0) {
	109	events \|= RTC_UF \| RTC_IRQF;
	110	rtc_data->irq_count = 0;
	111	}
	112	}
	113
	114	if (events)
	115	rtc_update_irq(rtc_data->rtc, 1, events);
	116
	117	return IRQ_HANDLED;
	118	}
	119
	120	static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled)
	121	{
	122	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
47eac337 WS	123	void __iomem *p = rtc_data->io + STMP3XXX_RTC_PERSISTENT0,
47eac337 WS	124	*ctl = rtc_data->io + STMP3XXX_RTC_CTRL;
df17f631	125
df17f631	126	if (enabled) {
46b21218	127	__mxs_setl(STMP3XXX_RTC_PERSISTENT0_ALARM_EN \|
47eac337	128	STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
46b21218	129	__mxs_setl(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, ctl);
df17f631	130	} else {
46b21218	131	__mxs_clrl(STMP3XXX_RTC_PERSISTENT0_ALARM_EN \|
47eac337	132	STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
46b21218	133	__mxs_clrl(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, ctl);
df17f631	134	}
	135	return 0;
	136	}
	137
df17f631	138	static int stmp3xxx_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	139	{
	140	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
	141
47eac337 WS	142	rtc_time_to_tm(__raw_readl(rtc_data->io + STMP3XXX_RTC_ALARM),
47eac337 WS	143	&alm->time);
df17f631	144	return 0;
	145	}
	146
	147	static int stmp3xxx_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	148	{
	149	unsigned long t;
	150	struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
	151
	152	rtc_tm_to_time(&alm->time, &t);
47eac337	153	__raw_writel(t, rtc_data->io + STMP3XXX_RTC_ALARM);
df17f631	154	return 0;
	155	}
	156
	157	static struct rtc_class_ops stmp3xxx_rtc_ops = {
	158	.alarm_irq_enable =
	159	stmp3xxx_alarm_irq_enable,
df17f631	160	.read_time = stmp3xxx_rtc_gettime,
	161	.set_mmss = stmp3xxx_rtc_set_mmss,
	162	.read_alarm = stmp3xxx_rtc_read_alarm,
	163	.set_alarm = stmp3xxx_rtc_set_alarm,
	164	};
	165
	166	static int stmp3xxx_rtc_remove(struct platform_device *pdev)
	167	{
	168	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev);
	169
	170	if (!rtc_data)
	171	return 0;
	172
46b21218	173	__mxs_clrl(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN \|
47eac337 WS	174	STMP3XXX_RTC_CTRL_ALARM_IRQ_EN,
47eac337 WS	175	rtc_data->io + STMP3XXX_RTC_CTRL);
df17f631	176	free_irq(rtc_data->irq_alarm, &pdev->dev);
	177	free_irq(rtc_data->irq_1msec, &pdev->dev);
	178	rtc_device_unregister(rtc_data->rtc);
	179	iounmap(rtc_data->io);
	180	kfree(rtc_data);
	181
	182	return 0;
	183	}
	184
	185	static int stmp3xxx_rtc_probe(struct platform_device *pdev)
	186	{
	187	struct stmp3xxx_rtc_data *rtc_data;
	188	struct resource *r;
	189	int err;
	190
	191	rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL);
	192	if (!rtc_data)
	193	return -ENOMEM;
	194
	195	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	196	if (!r) {
	197	dev_err(&pdev->dev, "failed to get resource\n");
	198	err = -ENXIO;
	199	goto out_free;
	200	}
	201
	202	rtc_data->io = ioremap(r->start, resource_size(r));
	203	if (!rtc_data->io) {
	204	dev_err(&pdev->dev, "ioremap failed\n");
	205	err = -EIO;
	206	goto out_free;
	207	}
	208
	209	rtc_data->irq_alarm = platform_get_irq(pdev, 0);
	210	rtc_data->irq_1msec = platform_get_irq(pdev, 1);
	211
47eac337 WS	212	if (!(__raw_readl(STMP3XXX_RTC_STAT + rtc_data->io) &
47eac337 WS	213	STMP3XXX_RTC_STAT_RTC_PRESENT)) {
df17f631	214	dev_err(&pdev->dev, "no device onboard\n");
	215	err = -ENODEV;
	216	goto out_remap;
	217	}
	218
46b21218 WS	219	mxs_reset_block(rtc_data->io);
46b21218 WS	220	__mxs_clrl(STMP3XXX_RTC_PERSISTENT0_ALARM_EN \|
47eac337 WS	221	STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN \|
	222	STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE,
	223	rtc_data->io + STMP3XXX_RTC_PERSISTENT0);
df17f631	224	rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
	225	&stmp3xxx_rtc_ops, THIS_MODULE);
	226	if (IS_ERR(rtc_data->rtc)) {
	227	err = PTR_ERR(rtc_data->rtc);
	228	goto out_remap;
	229	}
	230
	231	rtc_data->irq_count = 0;
	232	err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt,
	233	IRQF_DISABLED, "RTC alarm", &pdev->dev);
	234	if (err) {
	235	dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
	236	rtc_data->irq_alarm);
	237	goto out_irq_alarm;
	238	}
	239	err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt,
	240	IRQF_DISABLED, "RTC tick", &pdev->dev);
	241	if (err) {
	242	dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
	243	rtc_data->irq_1msec);
	244	goto out_irq1;
	245	}
	246
	247	platform_set_drvdata(pdev, rtc_data);
	248
	249	return 0;
	250
	251	out_irq1:
	252	free_irq(rtc_data->irq_alarm, &pdev->dev);
	253	out_irq_alarm:
46b21218	254	__mxs_clrl(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN \|
47eac337 WS	255	STMP3XXX_RTC_CTRL_ALARM_IRQ_EN,
47eac337 WS	256	rtc_data->io + STMP3XXX_RTC_CTRL);
df17f631	257	rtc_device_unregister(rtc_data->rtc);
	258	out_remap:
	259	iounmap(rtc_data->io);
	260	out_free:
	261	kfree(rtc_data);
	262	return err;
	263	}
	264
	265	#ifdef CONFIG_PM
	266	static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state)
	267	{
	268	return 0;
	269	}
	270
	271	static int stmp3xxx_rtc_resume(struct platform_device *dev)
	272	{
	273	struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev);
	274
46b21218 WS	275	mxs_reset_block(rtc_data->io);
46b21218 WS	276	__mxs_clrl(STMP3XXX_RTC_PERSISTENT0_ALARM_EN \|
47eac337 WS	277	STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN \|
	278	STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE,
	279	rtc_data->io + STMP3XXX_RTC_PERSISTENT0);
df17f631	280	return 0;
	281	}
	282	#else
	283	#define stmp3xxx_rtc_suspend NULL
	284	#define stmp3xxx_rtc_resume NULL
	285	#endif
	286
	287	static struct platform_driver stmp3xxx_rtcdrv = {
	288	.probe = stmp3xxx_rtc_probe,
	289	.remove = stmp3xxx_rtc_remove,
	290	.suspend = stmp3xxx_rtc_suspend,
	291	.resume = stmp3xxx_rtc_resume,
	292	.driver = {
	293	.name = "stmp3xxx-rtc",
	294	.owner = THIS_MODULE,
	295	},
	296	};
	297
	298	static int __init stmp3xxx_rtc_init(void)
	299	{
	300	return platform_driver_register(&stmp3xxx_rtcdrv);
	301	}
	302
	303	static void __exit stmp3xxx_rtc_exit(void)
	304	{
	305	platform_driver_unregister(&stmp3xxx_rtcdrv);
	306	}
	307
	308	module_init(stmp3xxx_rtc_init);
	309	module_exit(stmp3xxx_rtc_exit);
	310
	311	MODULE_DESCRIPTION("STMP3xxx RTC Driver");
	312	MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>");
	313	MODULE_LICENSE("GPL");