[linux.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/of.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/gfp.h>
#include <linux/module.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;
	struct clk	*clk;
};

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_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	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 -EINVAL; /* fall back into rtc-dev's emulation */

	if (enabled)
		writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	else
		writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	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,
	.alarm_irq_enable = mv_rtc_alarm_irq_enable,
};

static int __init mv_rtc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct rtc_plat_data *pdata;
	u32 rtc_time;
	u32 rtc_date;
	int ret = 0;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(pdata->ioaddr))
		return PTR_ERR(pdata->ioaddr);

	pdata->clk = devm_clk_get(&pdev->dev, NULL);
	/* Not all SoCs require a clock.*/
	if (!IS_ERR(pdata->clk))
		clk_prepare_enable(pdata->clk);

	/* 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");
		ret = -EINVAL;
		goto out;
	}

	/* 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");
			ret = -ENODEV;
			goto out;
		}
	}

	/*
	 * A date after January 19th, 2038 does not fit on 32 bits and
	 * will confuse the kernel and userspace. Reset to a sane date
	 * (January 1st, 2013) if we're after 2038.
	 */
	rtc_date = readl(pdata->ioaddr + RTC_DATE_REG_OFFS);
	if (bcd2bin((rtc_date >> RTC_YEAR_OFFS) & 0xff) >= 38) {
		dev_info(&pdev->dev, "invalid RTC date, resetting to January 1st, 2013\n");
		writel(0x130101, pdata->ioaddr + RTC_DATE_REG_OFFS);
	}

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

	platform_set_drvdata(pdev, pdata);

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

	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_SHARED,
				     pdev->name, pdata) < 0) {
			dev_warn(&pdev->dev, "interrupt not available.\n");
			pdata->irq = -1;
		}
	}

	return 0;
out:
	if (!IS_ERR(pdata->clk))
		clk_disable_unprepare(pdata->clk);

	return ret;
}

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);

	if (!IS_ERR(pdata->clk))
		clk_disable_unprepare(pdata->clk);

	return 0;
}

#ifdef CONFIG_OF
static struct of_device_id rtc_mv_of_match_table[] = {
	{ .compatible = "marvell,orion-rtc", },
	{}
};
#endif

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

module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);

MODULE_AUTHOR("Saeed Bishara <[email protected]>");
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>
ea983ede	15	#include <linux/of.h>
9d1d4f9e	16	#include <linux/delay.h>
89c58c19	17	#include <linux/clk.h>
5a0e3ad6	18	#include <linux/gfp.h>
2113852b	19	#include <linux/module.h>
defb4514 SB	20
	21
	22	#define RTC_TIME_REG_OFFS 0
	23	#define RTC_SECONDS_OFFS 0
	24	#define RTC_MINUTES_OFFS 8
	25	#define RTC_HOURS_OFFS 16
	26	#define RTC_WDAY_OFFS 24
	27	#define RTC_HOURS_12H_MODE (1 << 22) /* 12 hours mode */
	28
	29	#define RTC_DATE_REG_OFFS 4
	30	#define RTC_MDAY_OFFS 0
	31	#define RTC_MONTH_OFFS 8
	32	#define RTC_YEAR_OFFS 16
	33
aeedacae SB	34	#define RTC_ALARM_TIME_REG_OFFS 8
	35	#define RTC_ALARM_DATE_REG_OFFS 0xc
	36	#define RTC_ALARM_VALID (1 << 7)
	37
	38	#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
	39	#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
defb4514 SB	40
	41	struct rtc_plat_data {
	42	struct rtc_device *rtc;
	43	void __iomem *ioaddr;
aeedacae	44	int irq;
89c58c19	45	struct clk *clk;
defb4514 SB	46	};
	47
	48	static int mv_rtc_set_time(struct device dev, struct rtc_time tm)
	49	{
	50	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	51	void __iomem *ioaddr = pdata->ioaddr;
	52	u32 rtc_reg;
	53
	54	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) \|
	55	(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) \|
	56	(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) \|
	57	(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	58	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
	59
	60	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) \|
	61	(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) \|
	62	(bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
	63	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
	64
	65	return 0;
	66	}
	67
	68	static int mv_rtc_read_time(struct device dev, struct rtc_time tm)
	69	{
	70	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	71	void __iomem *ioaddr = pdata->ioaddr;
	72	u32 rtc_time, rtc_date;
	73	unsigned int year, month, day, hour, minute, second, wday;
	74
	75	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	76	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
	77
	78	second = rtc_time & 0x7f;
	79	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	80	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
	81	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
	82
	83	day = rtc_date & 0x3f;
	84	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	85	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
	86
	87	tm->tm_sec = bcd2bin(second);
	88	tm->tm_min = bcd2bin(minute);
	89	tm->tm_hour = bcd2bin(hour);
	90	tm->tm_mday = bcd2bin(day);
	91	tm->tm_wday = bcd2bin(wday);
	92	tm->tm_mon = bcd2bin(month) - 1;
	93	/* hw counts from year 2000, but tm_year is relative to 1900 */
	94	tm->tm_year = bcd2bin(year) + 100;
	95
	96	return rtc_valid_tm(tm);
	97	}
	98
aeedacae SB	99	static int mv_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	100	{
	101	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	102	void __iomem *ioaddr = pdata->ioaddr;
	103	u32 rtc_time, rtc_date;
	104	unsigned int year, month, day, hour, minute, second, wday;
	105
	106	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
	107	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
	108
	109	second = rtc_time & 0x7f;
	110	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	111	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
	112	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
	113
	114	day = rtc_date & 0x3f;
	115	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	116	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
	117
	118	alm->time.tm_sec = bcd2bin(second);
	119	alm->time.tm_min = bcd2bin(minute);
	120	alm->time.tm_hour = bcd2bin(hour);
	121	alm->time.tm_mday = bcd2bin(day);
	122	alm->time.tm_wday = bcd2bin(wday);
	123	alm->time.tm_mon = bcd2bin(month) - 1;
	124	/* hw counts from year 2000, but tm_year is relative to 1900 */
	125	alm->time.tm_year = bcd2bin(year) + 100;
	126
	127	if (rtc_valid_tm(&alm->time) < 0) {
	128	dev_err(dev, "retrieved alarm date/time is not valid.\n");
	129	rtc_time_to_tm(0, &alm->time);
	130	}
	131
	132	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	133	return 0;
	134	}
	135
	136	static int mv_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	137	{
	138	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	139	void __iomem *ioaddr = pdata->ioaddr;
	140	u32 rtc_reg = 0;
	141
	142	if (alm->time.tm_sec >= 0)
	143	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_sec))
	144	<< RTC_SECONDS_OFFS;
	145	if (alm->time.tm_min >= 0)
	146	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_min))
	147	<< RTC_MINUTES_OFFS;
	148	if (alm->time.tm_hour >= 0)
	149	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_hour))
	150	<< RTC_HOURS_OFFS;
	151
	152	writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
	153
	154	if (alm->time.tm_mday >= 0)
	155	rtc_reg = (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mday))
	156	<< RTC_MDAY_OFFS;
	157	else
	158	rtc_reg = 0;
	159
	160	if (alm->time.tm_mon >= 0)
	161	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mon + 1))
	162	<< RTC_MONTH_OFFS;
163
164	if (alm->time.tm_year >= 0)
165	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_year % 100))
166	<< RTC_YEAR_OFFS;
167
168	writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
169	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
170	writel(alm->enabled ? 1 : 0,
171	ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
172
173	return 0;
174	}
175
16380c15	176	static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
aeedacae SB	177	{
	178	struct platform_device *pdev = to_platform_device(dev);
	179	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	180	void __iomem *ioaddr = pdata->ioaddr;
	181
	182	if (pdata->irq < 0)
16380c15 JS	183	return -EINVAL; /* fall back into rtc-dev's emulation */
	184
	185	if (enabled)
aeedacae	186	writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
16380c15 JS	187	else
16380c15 JS	188	writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
aeedacae SB	189	return 0;
	190	}
	191
	192	static irqreturn_t mv_rtc_interrupt(int irq, void *data)
	193	{
	194	struct rtc_plat_data *pdata = data;
	195	void __iomem *ioaddr = pdata->ioaddr;
	196
	197	/* alarm irq? */
	198	if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
	199	return IRQ_NONE;
	200
	201	/* clear interrupt */
	202	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
	203	rtc_update_irq(pdata->rtc, 1, RTC_IRQF \| RTC_AF);
	204	return IRQ_HANDLED;
	205	}
	206
defb4514 SB	207	static const struct rtc_class_ops mv_rtc_ops = {
	208	.read_time = mv_rtc_read_time,
	209	.set_time = mv_rtc_set_time,
	210	};
	211
aeedacae SB	212	static const struct rtc_class_ops mv_rtc_alarm_ops = {
	213	.read_time = mv_rtc_read_time,
	214	.set_time = mv_rtc_set_time,
	215	.read_alarm = mv_rtc_read_alarm,
	216	.set_alarm = mv_rtc_set_alarm,
16380c15	217	.alarm_irq_enable = mv_rtc_alarm_irq_enable,
aeedacae SB	218	};
aeedacae SB	219
b69af437	220	static int __init mv_rtc_probe(struct platform_device *pdev)
defb4514 SB	221	{
	222	struct resource *res;
	223	struct rtc_plat_data *pdata;
defb4514	224	u32 rtc_time;
e102dc7a	225	u32 rtc_date;
89c58c19	226	int ret = 0;
defb4514	227
defb4514 SB	228	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	229	if (!pdata)
	230	return -ENOMEM;
	231
7c1d69ee JL	232	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	233	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
	234	if (IS_ERR(pdata->ioaddr))
	235	return PTR_ERR(pdata->ioaddr);
defb4514	236
89c58c19 AL	237	pdata->clk = devm_clk_get(&pdev->dev, NULL);
	238	/* Not all SoCs require a clock.*/
	239	if (!IS_ERR(pdata->clk))
	240	clk_prepare_enable(pdata->clk);
	241
defb4514 SB	242	/* make sure the 24 hours mode is enabled */
	243	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	244	if (rtc_time & RTC_HOURS_12H_MODE) {
	245	dev_err(&pdev->dev, "24 Hours mode not supported.\n");
89c58c19 AL	246	ret = -EINVAL;
89c58c19 AL	247	goto out;
defb4514 SB	248	}
defb4514 SB	249
9d1d4f9e NP	250	/* make sure it is actually functional */
	251	if (rtc_time == 0x01000000) {
	252	ssleep(1);
	253	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	254	if (rtc_time == 0x01000000) {
	255	dev_err(&pdev->dev, "internal RTC not ticking\n");
89c58c19 AL	256	ret = -ENODEV;
89c58c19 AL	257	goto out;
9d1d4f9e NP	258	}
	259	}
	260
e102dc7a TP	261	/*
	262	* A date after January 19th, 2038 does not fit on 32 bits and
	263	* will confuse the kernel and userspace. Reset to a sane date
	264	* (January 1st, 2013) if we're after 2038.
	265	*/
	266	rtc_date = readl(pdata->ioaddr + RTC_DATE_REG_OFFS);
	267	if (bcd2bin((rtc_date >> RTC_YEAR_OFFS) & 0xff) >= 38) {
	268	dev_info(&pdev->dev, "invalid RTC date, resetting to January 1st, 2013\n");
	269	writel(0x130101, pdata->ioaddr + RTC_DATE_REG_OFFS);
	270	}
	271
aeedacae SB	272	pdata->irq = platform_get_irq(pdev, 0);
aeedacae SB	273
defb4514	274	platform_set_drvdata(pdev, pdata);
aeedacae SB	275
	276	if (pdata->irq >= 0) {
	277	device_init_wakeup(&pdev->dev, 1);
4241e2b8	278	pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
aeedacae SB	279	&mv_rtc_alarm_ops,
aeedacae SB	280	THIS_MODULE);
4241e2b8 JH	281	} else {
4241e2b8 JH	282	pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
aeedacae	283	&mv_rtc_ops, THIS_MODULE);
4241e2b8	284	}
89c58c19 AL	285	if (IS_ERR(pdata->rtc)) {
	286	ret = PTR_ERR(pdata->rtc);
	287	goto out;
	288	}
defb4514	289
aeedacae SB	290	if (pdata->irq >= 0) {
	291	writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	292	if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
2f6e5f94	293	IRQF_SHARED,
aeedacae SB	294	pdev->name, pdata) < 0) {
	295	dev_warn(&pdev->dev, "interrupt not available.\n");
	296	pdata->irq = -1;
	297	}
	298	}
	299
defb4514	300	return 0;
89c58c19 AL	301	out:
	302	if (!IS_ERR(pdata->clk))
	303	clk_disable_unprepare(pdata->clk);
	304
	305	return ret;
defb4514 SB	306	}
	307
	308	static int __exit mv_rtc_remove(struct platform_device *pdev)
	309	{
	310	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	311
aeedacae SB	312	if (pdata->irq >= 0)
	313	device_init_wakeup(&pdev->dev, 0);
	314
89c58c19 AL	315	if (!IS_ERR(pdata->clk))
	316	clk_disable_unprepare(pdata->clk);
	317
defb4514 SB	318	return 0;
	319	}
	320
ea983ede JC	321	#ifdef CONFIG_OF
ea983ede JC	322	static struct of_device_id rtc_mv_of_match_table[] = {
77843504	323	{ .compatible = "marvell,orion-rtc", },
ea983ede JC	324	{}
	325	};
	326	#endif
	327
defb4514 SB	328	static struct platform_driver mv_rtc_driver = {
	329	.remove = __exit_p(mv_rtc_remove),
	330	.driver = {
	331	.name = "rtc-mv",
	332	.owner = THIS_MODULE,
ea983ede	333	.of_match_table = of_match_ptr(rtc_mv_of_match_table),
defb4514 SB	334	},
	335	};
	336
1963f7cd	337	module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
defb4514 SB	338
	339	MODULE_AUTHOR("Saeed Bishara <[email protected]>");
	340	MODULE_DESCRIPTION("Marvell RTC driver");
	341	MODULE_LICENSE("GPL");
	342	MODULE_ALIAS("platform:rtc-mv");