[net-next-2.6.git] / drivers / rtc / rtc-mv.c

/*
 * Driver for the RTC in Marvell SoCs.
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/gfp.h>


#define RTC_TIME_REG_OFFS	0
#define RTC_SECONDS_OFFS	0
#define RTC_MINUTES_OFFS	8
#define RTC_HOURS_OFFS		16
#define RTC_WDAY_OFFS		24
#define RTC_HOURS_12H_MODE		(1 << 22) /* 12 hours mode */

#define RTC_DATE_REG_OFFS	4
#define RTC_MDAY_OFFS		0
#define RTC_MONTH_OFFS		8
#define RTC_YEAR_OFFS		16

#define RTC_ALARM_TIME_REG_OFFS	8
#define RTC_ALARM_DATE_REG_OFFS	0xc
#define RTC_ALARM_VALID		(1 << 7)

#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS	0x10
#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS	0x14

struct rtc_plat_data {
	struct rtc_device *rtc;
	void __iomem *ioaddr;
	int		irq;
};

static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32	rtc_reg;

	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
		(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
		(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
		(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);

	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
		(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
		(bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);

	return 0;
}

static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32	rtc_time, rtc_date;
	unsigned int year, month, day, hour, minute, second, wday;

	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);

	second = rtc_time & 0x7f;
	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

	day = rtc_date & 0x3f;
	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

	tm->tm_sec = bcd2bin(second);
	tm->tm_min = bcd2bin(minute);
	tm->tm_hour = bcd2bin(hour);
	tm->tm_mday = bcd2bin(day);
	tm->tm_wday = bcd2bin(wday);
	tm->tm_mon = bcd2bin(month) - 1;
	/* hw counts from year 2000, but tm_year is relative to 1900 */
	tm->tm_year = bcd2bin(year) + 100;

	return rtc_valid_tm(tm);
}

static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32	rtc_time, rtc_date;
	unsigned int year, month, day, hour, minute, second, wday;

	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);

	second = rtc_time & 0x7f;
	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

	day = rtc_date & 0x3f;
	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

	alm->time.tm_sec = bcd2bin(second);
	alm->time.tm_min = bcd2bin(minute);
	alm->time.tm_hour = bcd2bin(hour);
	alm->time.tm_mday = bcd2bin(day);
	alm->time.tm_wday = bcd2bin(wday);
	alm->time.tm_mon = bcd2bin(month) - 1;
	/* hw counts from year 2000, but tm_year is relative to 1900 */
	alm->time.tm_year = bcd2bin(year) + 100;

	if (rtc_valid_tm(&alm->time) < 0) {
		dev_err(dev, "retrieved alarm date/time is not valid.\n");
		rtc_time_to_tm(0, &alm->time);
	}

	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	return 0;
}

static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32 rtc_reg = 0;

	if (alm->time.tm_sec >= 0)
		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
			<< RTC_SECONDS_OFFS;
	if (alm->time.tm_min >= 0)
		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
			<< RTC_MINUTES_OFFS;
	if (alm->time.tm_hour >= 0)
		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
			<< RTC_HOURS_OFFS;

	writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);

	if (alm->time.tm_mday >= 0)
		rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
			<< RTC_MDAY_OFFS;
	else
		rtc_reg = 0;

	if (alm->time.tm_mon >= 0)
		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
			<< RTC_MONTH_OFFS;

	if (alm->time.tm_year >= 0)
		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year % 100))
			<< RTC_YEAR_OFFS;

	writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
	writel(alm->enabled ? 1 : 0,
	       ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

	return 0;
}

static int mv_rtc_ioctl(struct device *dev, unsigned int cmd,
			unsigned long arg)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;

	if (pdata->irq < 0)
		return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
	switch (cmd) {
	case RTC_AIE_OFF:
		writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
		break;
	case RTC_AIE_ON:
		writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
		break;
	default:
		return -ENOIOCTLCMD;
	}
	return 0;
}

static irqreturn_t mv_rtc_interrupt(int irq, void *data)
{
	struct rtc_plat_data *pdata = data;
	void __iomem *ioaddr = pdata->ioaddr;

	/* alarm irq? */
	if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
		return IRQ_NONE;

	/* clear interrupt */
	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
	rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
	return IRQ_HANDLED;
}

static const struct rtc_class_ops mv_rtc_ops = {
	.read_time	= mv_rtc_read_time,
	.set_time	= mv_rtc_set_time,
};

static const struct rtc_class_ops mv_rtc_alarm_ops = {
	.read_time	= mv_rtc_read_time,
	.set_time	= mv_rtc_set_time,
	.read_alarm	= mv_rtc_read_alarm,
	.set_alarm	= mv_rtc_set_alarm,
	.ioctl		= mv_rtc_ioctl,
};

static int __devinit mv_rtc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct rtc_plat_data *pdata;
	resource_size_t size;
	u32 rtc_time;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	size = resource_size(res);
	if (!devm_request_mem_region(&pdev->dev, res->start, size,
				     pdev->name))
		return -EBUSY;

	pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
	if (!pdata->ioaddr)
		return -ENOMEM;

	/* make sure the 24 hours mode is enabled */
	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	if (rtc_time & RTC_HOURS_12H_MODE) {
		dev_err(&pdev->dev, "24 Hours mode not supported.\n");
		return -EINVAL;
	}

	/* make sure it is actually functional */
	if (rtc_time == 0x01000000) {
		ssleep(1);
		rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
		if (rtc_time == 0x01000000) {
			dev_err(&pdev->dev, "internal RTC not ticking\n");
			return -ENODEV;
		}
	}

	pdata->irq = platform_get_irq(pdev, 0);

	platform_set_drvdata(pdev, pdata);

	if (pdata->irq >= 0) {
		device_init_wakeup(&pdev->dev, 1);
		pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
						 &mv_rtc_alarm_ops,
						 THIS_MODULE);
	} else
		pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
						 &mv_rtc_ops, THIS_MODULE);
	if (IS_ERR(pdata->rtc))
		return PTR_ERR(pdata->rtc);

	if (pdata->irq >= 0) {
		writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
		if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
				     IRQF_DISABLED | IRQF_SHARED,
				     pdev->name, pdata) < 0) {
			dev_warn(&pdev->dev, "interrupt not available.\n");
			pdata->irq = -1;
		}
	}

	return 0;
}

static int __exit mv_rtc_remove(struct platform_device *pdev)
{
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	if (pdata->irq >= 0)
		device_init_wakeup(&pdev->dev, 0);

	rtc_device_unregister(pdata->rtc);
	return 0;
}

static struct platform_driver mv_rtc_driver = {
	.remove		= __exit_p(mv_rtc_remove),
	.driver		= {
		.name	= "rtc-mv",
		.owner	= THIS_MODULE,
	},
};

static __init int mv_init(void)
{
	return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
}

static __exit void mv_exit(void)
{
	platform_driver_unregister(&mv_rtc_driver);
}

module_init(mv_init);
module_exit(mv_exit);

MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
MODULE_DESCRIPTION("Marvell RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rtc-mv");
Commit	Line	Data
defb4514 SB	1	/*
	2	* Driver for the RTC in Marvell SoCs.
	3	*
	4	* This file is licensed under the terms of the GNU General Public
	5	* License version 2. This program is licensed "as is" without any
	6	* warranty of any kind, whether express or implied.
	7	*/
	8
	9	#include <linux/init.h>
	10	#include <linux/kernel.h>
	11	#include <linux/rtc.h>
	12	#include <linux/bcd.h>
	13	#include <linux/io.h>
	14	#include <linux/platform_device.h>
9d1d4f9e	15	#include <linux/delay.h>
5a0e3ad6	16	#include <linux/gfp.h>
defb4514 SB	17
	18
	19	#define RTC_TIME_REG_OFFS 0
	20	#define RTC_SECONDS_OFFS 0
	21	#define RTC_MINUTES_OFFS 8
	22	#define RTC_HOURS_OFFS 16
	23	#define RTC_WDAY_OFFS 24
	24	#define RTC_HOURS_12H_MODE (1 << 22) /* 12 hours mode */
	25
	26	#define RTC_DATE_REG_OFFS 4
	27	#define RTC_MDAY_OFFS 0
	28	#define RTC_MONTH_OFFS 8
	29	#define RTC_YEAR_OFFS 16
	30
aeedacae SB	31	#define RTC_ALARM_TIME_REG_OFFS 8
	32	#define RTC_ALARM_DATE_REG_OFFS 0xc
	33	#define RTC_ALARM_VALID (1 << 7)
	34
	35	#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
	36	#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
defb4514 SB	37
	38	struct rtc_plat_data {
	39	struct rtc_device *rtc;
	40	void __iomem *ioaddr;
aeedacae	41	int irq;
defb4514 SB	42	};
	43
	44	static int mv_rtc_set_time(struct device dev, struct rtc_time tm)
	45	{
	46	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	47	void __iomem *ioaddr = pdata->ioaddr;
	48	u32 rtc_reg;
	49
	50	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) \|
	51	(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) \|
	52	(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) \|
	53	(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	54	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
	55
	56	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) \|
	57	(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) \|
	58	(bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
	59	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
	60
	61	return 0;
	62	}
	63
	64	static int mv_rtc_read_time(struct device dev, struct rtc_time tm)
	65	{
	66	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	67	void __iomem *ioaddr = pdata->ioaddr;
	68	u32 rtc_time, rtc_date;
	69	unsigned int year, month, day, hour, minute, second, wday;
	70
	71	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	72	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
	73
	74	second = rtc_time & 0x7f;
	75	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	76	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
	77	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
	78
	79	day = rtc_date & 0x3f;
	80	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	81	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
	82
	83	tm->tm_sec = bcd2bin(second);
	84	tm->tm_min = bcd2bin(minute);
	85	tm->tm_hour = bcd2bin(hour);
	86	tm->tm_mday = bcd2bin(day);
	87	tm->tm_wday = bcd2bin(wday);
	88	tm->tm_mon = bcd2bin(month) - 1;
	89	/* hw counts from year 2000, but tm_year is relative to 1900 */
	90	tm->tm_year = bcd2bin(year) + 100;
	91
	92	return rtc_valid_tm(tm);
	93	}
	94
aeedacae SB	95	static int mv_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	96	{
	97	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	98	void __iomem *ioaddr = pdata->ioaddr;
	99	u32 rtc_time, rtc_date;
	100	unsigned int year, month, day, hour, minute, second, wday;
	101
	102	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
	103	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
	104
	105	second = rtc_time & 0x7f;
	106	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	107	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
	108	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
	109
	110	day = rtc_date & 0x3f;
	111	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	112	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
	113
	114	alm->time.tm_sec = bcd2bin(second);
	115	alm->time.tm_min = bcd2bin(minute);
	116	alm->time.tm_hour = bcd2bin(hour);
	117	alm->time.tm_mday = bcd2bin(day);
	118	alm->time.tm_wday = bcd2bin(wday);
	119	alm->time.tm_mon = bcd2bin(month) - 1;
	120	/* hw counts from year 2000, but tm_year is relative to 1900 */
	121	alm->time.tm_year = bcd2bin(year) + 100;
	122
	123	if (rtc_valid_tm(&alm->time) < 0) {
	124	dev_err(dev, "retrieved alarm date/time is not valid.\n");
	125	rtc_time_to_tm(0, &alm->time);
	126	}
	127
	128	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	129	return 0;
	130	}
	131
	132	static int mv_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	133	{
	134	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	135	void __iomem *ioaddr = pdata->ioaddr;
	136	u32 rtc_reg = 0;
	137
	138	if (alm->time.tm_sec >= 0)
	139	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_sec))
	140	<< RTC_SECONDS_OFFS;
	141	if (alm->time.tm_min >= 0)
	142	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_min))
	143	<< RTC_MINUTES_OFFS;
	144	if (alm->time.tm_hour >= 0)
	145	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_hour))
	146	<< RTC_HOURS_OFFS;
	147
	148	writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
	149
	150	if (alm->time.tm_mday >= 0)
	151	rtc_reg = (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mday))
	152	<< RTC_MDAY_OFFS;
	153	else
	154	rtc_reg = 0;
	155
	156	if (alm->time.tm_mon >= 0)
	157	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mon + 1))
	158	<< RTC_MONTH_OFFS;
159
160	if (alm->time.tm_year >= 0)
161	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_year % 100))
162	<< RTC_YEAR_OFFS;
163
164	writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
165	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
166	writel(alm->enabled ? 1 : 0,
167	ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
168
169	return 0;
170	}
171
172	static int mv_rtc_ioctl(struct device *dev, unsigned int cmd,
173	unsigned long arg)
174	{
175	struct platform_device *pdev = to_platform_device(dev);
176	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
177	void __iomem *ioaddr = pdata->ioaddr;
178
179	if (pdata->irq < 0)
180	return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
181	switch (cmd) {
182	case RTC_AIE_OFF:
183	writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
184	break;
185	case RTC_AIE_ON:
186	writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
187	break;
188	default:
189	return -ENOIOCTLCMD;
190	}
191	return 0;
192	}
193
194	static irqreturn_t mv_rtc_interrupt(int irq, void *data)
195	{
196	struct rtc_plat_data *pdata = data;
197	void __iomem *ioaddr = pdata->ioaddr;
198
199	/* alarm irq? */
200	if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
201	return IRQ_NONE;
202
203	/* clear interrupt */
204	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
205	rtc_update_irq(pdata->rtc, 1, RTC_IRQF \| RTC_AF);
206	return IRQ_HANDLED;
207	}
208
defb4514 SB	209	static const struct rtc_class_ops mv_rtc_ops = {
	210	.read_time = mv_rtc_read_time,
	211	.set_time = mv_rtc_set_time,
	212	};
	213
aeedacae SB	214	static const struct rtc_class_ops mv_rtc_alarm_ops = {
	215	.read_time = mv_rtc_read_time,
	216	.set_time = mv_rtc_set_time,
	217	.read_alarm = mv_rtc_read_alarm,
	218	.set_alarm = mv_rtc_set_alarm,
	219	.ioctl = mv_rtc_ioctl,
	220	};
	221
	222	static int __devinit mv_rtc_probe(struct platform_device *pdev)
defb4514 SB	223	{
	224	struct resource *res;
	225	struct rtc_plat_data *pdata;
	226	resource_size_t size;
	227	u32 rtc_time;
	228
	229	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	230	if (!res)
	231	return -ENODEV;
	232
	233	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	234	if (!pdata)
	235	return -ENOMEM;
	236
	237	size = resource_size(res);
	238	if (!devm_request_mem_region(&pdev->dev, res->start, size,
	239	pdev->name))
	240	return -EBUSY;
	241
	242	pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
	243	if (!pdata->ioaddr)
	244	return -ENOMEM;
	245
	246	/* make sure the 24 hours mode is enabled */
	247	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	248	if (rtc_time & RTC_HOURS_12H_MODE) {
	249	dev_err(&pdev->dev, "24 Hours mode not supported.\n");
	250	return -EINVAL;
	251	}
	252
9d1d4f9e NP	253	/* make sure it is actually functional */
	254	if (rtc_time == 0x01000000) {
	255	ssleep(1);
	256	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	257	if (rtc_time == 0x01000000) {
	258	dev_err(&pdev->dev, "internal RTC not ticking\n");
	259	return -ENODEV;
	260	}
	261	}
	262
aeedacae SB	263	pdata->irq = platform_get_irq(pdev, 0);
aeedacae SB	264
defb4514	265	platform_set_drvdata(pdev, pdata);
aeedacae SB	266
	267	if (pdata->irq >= 0) {
	268	device_init_wakeup(&pdev->dev, 1);
	269	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
	270	&mv_rtc_alarm_ops,
	271	THIS_MODULE);
	272	} else
	273	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
	274	&mv_rtc_ops, THIS_MODULE);
defb4514 SB	275	if (IS_ERR(pdata->rtc))
	276	return PTR_ERR(pdata->rtc);
	277
aeedacae SB	278	if (pdata->irq >= 0) {
	279	writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	280	if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
	281	IRQF_DISABLED \| IRQF_SHARED,
	282	pdev->name, pdata) < 0) {
	283	dev_warn(&pdev->dev, "interrupt not available.\n");
	284	pdata->irq = -1;
	285	}
	286	}
	287
defb4514 SB	288	return 0;
	289	}
	290
	291	static int __exit mv_rtc_remove(struct platform_device *pdev)
	292	{
	293	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	294
aeedacae SB	295	if (pdata->irq >= 0)
	296	device_init_wakeup(&pdev->dev, 0);
	297
defb4514 SB	298	rtc_device_unregister(pdata->rtc);
	299	return 0;
	300	}
	301
	302	static struct platform_driver mv_rtc_driver = {
	303	.remove = __exit_p(mv_rtc_remove),
	304	.driver = {
	305	.name = "rtc-mv",
	306	.owner = THIS_MODULE,
	307	},
	308	};
	309
	310	static __init int mv_init(void)
	311	{
	312	return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
	313	}
	314
	315	static __exit void mv_exit(void)
	316	{
	317	platform_driver_unregister(&mv_rtc_driver);
	318	}
	319
	320	module_init(mv_init);
	321	module_exit(mv_exit);
	322
	323	MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
	324	MODULE_DESCRIPTION("Marvell RTC driver");
	325	MODULE_LICENSE("GPL");
	326	MODULE_ALIAS("platform:rtc-mv");