[linux-block.git] / drivers / rtc / rtc-mv.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for the RTC in Marvell SoCs.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/bitops.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	BIT(22) /* 12 hour 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		BIT(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 hour 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 0;
}

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 hour 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;

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

	return rtc_valid_tm(&alm->time);
}

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 rtc_plat_data *pdata = dev_get_drvdata(dev);
	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,
	.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 rtc_plat_data *pdata;
	u32 rtc_time;
	int ret = 0;

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

	pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);
	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 hour mode is enabled */
	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	if (rtc_time & RTC_HOURS_12H_MODE) {
		dev_err(&pdev->dev, "12 Hour mode is enabled but 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;
		}
	}

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

	platform_set_drvdata(pdev, pdata);

	pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
	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;
		}
	}

	if (pdata->irq >= 0)
		device_init_wakeup(&pdev->dev, 1);
	else
		clear_bit(RTC_FEATURE_ALARM, pdata->rtc->features);

	pdata->rtc->ops = &mv_rtc_ops;
	pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	pdata->rtc->range_max = RTC_TIMESTAMP_END_2099;

	ret = devm_rtc_register_device(pdata->rtc);
	if (!ret)
		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 const struct of_device_id rtc_mv_of_match_table[] = {
	{ .compatible = "marvell,orion-rtc", },
	{}
};
MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
#endif

static struct platform_driver mv_rtc_driver = {
	.remove		= __exit_p(mv_rtc_remove),
	.driver		= {
		.name	= "rtc-mv",
		.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 <saeed@marvell.com>");
MODULE_DESCRIPTION("Marvell RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rtc-mv");
Commit	Line	Data
b6743615	1	// SPDX-License-Identifier: GPL-2.0
defb4514 SB	2	/*
defb4514 SB	3	* Driver for the RTC in Marvell SoCs.
defb4514 SB	4	*/
	5
	6	#include <linux/init.h>
	7	#include <linux/kernel.h>
	8	#include <linux/rtc.h>
	9	#include <linux/bcd.h>
fe561336	10	#include <linux/bitops.h>
defb4514 SB	11	#include <linux/io.h>
defb4514 SB	12	#include <linux/platform_device.h>
ea983ede	13	#include <linux/of.h>
9d1d4f9e	14	#include <linux/delay.h>
89c58c19	15	#include <linux/clk.h>
5a0e3ad6	16	#include <linux/gfp.h>
2113852b	17	#include <linux/module.h>
defb4514 SB	18
	19
	20	#define RTC_TIME_REG_OFFS 0
	21	#define RTC_SECONDS_OFFS 0
	22	#define RTC_MINUTES_OFFS 8
	23	#define RTC_HOURS_OFFS 16
	24	#define RTC_WDAY_OFFS 24
fe561336	25	#define RTC_HOURS_12H_MODE BIT(22) /* 12 hour mode */
defb4514 SB	26
	27	#define RTC_DATE_REG_OFFS 4
	28	#define RTC_MDAY_OFFS 0
	29	#define RTC_MONTH_OFFS 8
	30	#define RTC_YEAR_OFFS 16
	31
aeedacae SB	32	#define RTC_ALARM_TIME_REG_OFFS 8
aeedacae SB	33	#define RTC_ALARM_DATE_REG_OFFS 0xc
fe561336	34	#define RTC_ALARM_VALID BIT(7)
aeedacae SB	35
	36	#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
	37	#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
defb4514 SB	38
	39	struct rtc_plat_data {
	40	struct rtc_device *rtc;
	41	void __iomem *ioaddr;
aeedacae	42	int irq;
89c58c19	43	struct clk *clk;
defb4514 SB	44	};
	45
	46	static int mv_rtc_set_time(struct device dev, struct rtc_time tm)
	47	{
	48	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	49	void __iomem *ioaddr = pdata->ioaddr;
	50	u32 rtc_reg;
	51
	52	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) \|
	53	(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) \|
	54	(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) \|
	55	(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	56	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
	57
	58	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) \|
	59	(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) \|
b46c5815	60	(bin2bcd(tm->tm_year - 100) << RTC_YEAR_OFFS);
defb4514 SB	61	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
	62
	63	return 0;
	64	}
	65
	66	static int mv_rtc_read_time(struct device dev, struct rtc_time tm)
	67	{
	68	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	69	void __iomem *ioaddr = pdata->ioaddr;
	70	u32 rtc_time, rtc_date;
	71	unsigned int year, month, day, hour, minute, second, wday;
	72
	73	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	74	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
	75
	76	second = rtc_time & 0x7f;
	77	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
4042a147	78	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
defb4514 SB	79	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
	80
	81	day = rtc_date & 0x3f;
	82	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	83	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
	84
	85	tm->tm_sec = bcd2bin(second);
	86	tm->tm_min = bcd2bin(minute);
	87	tm->tm_hour = bcd2bin(hour);
	88	tm->tm_mday = bcd2bin(day);
	89	tm->tm_wday = bcd2bin(wday);
	90	tm->tm_mon = bcd2bin(month) - 1;
	91	/* hw counts from year 2000, but tm_year is relative to 1900 */
	92	tm->tm_year = bcd2bin(year) + 100;
	93
22652ba7	94	return 0;
defb4514 SB	95	}
defb4514 SB	96
aeedacae SB	97	static int mv_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	98	{
	99	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	100	void __iomem *ioaddr = pdata->ioaddr;
	101	u32 rtc_time, rtc_date;
	102	unsigned int year, month, day, hour, minute, second, wday;
	103
	104	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
	105	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
	106
	107	second = rtc_time & 0x7f;
	108	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
4042a147	109	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
aeedacae SB	110	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
	111
	112	day = rtc_date & 0x3f;
	113	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	114	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
	115
	116	alm->time.tm_sec = bcd2bin(second);
	117	alm->time.tm_min = bcd2bin(minute);
	118	alm->time.tm_hour = bcd2bin(hour);
	119	alm->time.tm_mday = bcd2bin(day);
	120	alm->time.tm_wday = bcd2bin(wday);
	121	alm->time.tm_mon = bcd2bin(month) - 1;
	122	/* hw counts from year 2000, but tm_year is relative to 1900 */
	123	alm->time.tm_year = bcd2bin(year) + 100;
	124
aeedacae	125	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
959e8b77 AB	126
959e8b77 AB	127	return rtc_valid_tm(&alm->time);
aeedacae SB	128	}
	129
	130	static int mv_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	131	{
	132	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	133	void __iomem *ioaddr = pdata->ioaddr;
	134	u32 rtc_reg = 0;
	135
	136	if (alm->time.tm_sec >= 0)
	137	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_sec))
	138	<< RTC_SECONDS_OFFS;
	139	if (alm->time.tm_min >= 0)
	140	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_min))
	141	<< RTC_MINUTES_OFFS;
	142	if (alm->time.tm_hour >= 0)
	143	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_hour))
	144	<< RTC_HOURS_OFFS;
	145
	146	writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
	147
	148	if (alm->time.tm_mday >= 0)
	149	rtc_reg = (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mday))
	150	<< RTC_MDAY_OFFS;
	151	else
	152	rtc_reg = 0;
	153
	154	if (alm->time.tm_mon >= 0)
	155	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mon + 1))
	156	<< RTC_MONTH_OFFS;
	157
	158	if (alm->time.tm_year >= 0)
b46c5815	159	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_year - 100))
aeedacae SB	160	<< RTC_YEAR_OFFS;
	161
	162	writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
	163	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
	164	writel(alm->enabled ? 1 : 0,
	165	ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	166
	167	return 0;
	168	}
	169
16380c15	170	static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
aeedacae	171	{
85368bb9	172	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
aeedacae SB	173	void __iomem *ioaddr = pdata->ioaddr;
	174
	175	if (pdata->irq < 0)
16380c15 JS	176	return -EINVAL; /* fall back into rtc-dev's emulation */
	177
	178	if (enabled)
aeedacae	179	writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
16380c15 JS	180	else
16380c15 JS	181	writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
aeedacae SB	182	return 0;
	183	}
	184
	185	static irqreturn_t mv_rtc_interrupt(int irq, void *data)
	186	{
	187	struct rtc_plat_data *pdata = data;
	188	void __iomem *ioaddr = pdata->ioaddr;
	189
	190	/* alarm irq? */
	191	if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
	192	return IRQ_NONE;
	193
	194	/* clear interrupt */
	195	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
	196	rtc_update_irq(pdata->rtc, 1, RTC_IRQF \| RTC_AF);
	197	return IRQ_HANDLED;
	198	}
	199
defb4514 SB	200	static const struct rtc_class_ops mv_rtc_ops = {
	201	.read_time = mv_rtc_read_time,
	202	.set_time = mv_rtc_set_time,
aeedacae SB	203	.read_alarm = mv_rtc_read_alarm,
aeedacae SB	204	.set_alarm = mv_rtc_set_alarm,
16380c15	205	.alarm_irq_enable = mv_rtc_alarm_irq_enable,
aeedacae SB	206	};
aeedacae SB	207
b69af437	208	static int __init mv_rtc_probe(struct platform_device *pdev)
defb4514	209	{
defb4514	210	struct rtc_plat_data *pdata;
defb4514	211	u32 rtc_time;
89c58c19	212	int ret = 0;
defb4514	213
defb4514 SB	214	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	215	if (!pdata)
	216	return -ENOMEM;
	217
09ef18bc	218	pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);
7c1d69ee JL	219	if (IS_ERR(pdata->ioaddr))
7c1d69ee JL	220	return PTR_ERR(pdata->ioaddr);
defb4514	221
89c58c19 AL	222	pdata->clk = devm_clk_get(&pdev->dev, NULL);
	223	/* Not all SoCs require a clock.*/
	224	if (!IS_ERR(pdata->clk))
	225	clk_prepare_enable(pdata->clk);
	226
4042a147	227	/* make sure the 24 hour mode is enabled */
defb4514 SB	228	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
defb4514 SB	229	if (rtc_time & RTC_HOURS_12H_MODE) {
4042a147	230	dev_err(&pdev->dev, "12 Hour mode is enabled but not supported.\n");
89c58c19 AL	231	ret = -EINVAL;
89c58c19 AL	232	goto out;
defb4514 SB	233	}
defb4514 SB	234
9d1d4f9e NP	235	/* make sure it is actually functional */
	236	if (rtc_time == 0x01000000) {
	237	ssleep(1);
	238	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	239	if (rtc_time == 0x01000000) {
	240	dev_err(&pdev->dev, "internal RTC not ticking\n");
89c58c19 AL	241	ret = -ENODEV;
89c58c19 AL	242	goto out;
9d1d4f9e NP	243	}
	244	}
	245
aeedacae SB	246	pdata->irq = platform_get_irq(pdev, 0);
aeedacae SB	247
defb4514	248	platform_set_drvdata(pdev, pdata);
aeedacae	249
5b25a71b	250	pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
89c58c19 AL	251	if (IS_ERR(pdata->rtc)) {
	252	ret = PTR_ERR(pdata->rtc);
	253	goto out;
	254	}
defb4514	255
aeedacae SB	256	if (pdata->irq >= 0) {
	257	writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	258	if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
2f6e5f94	259	IRQF_SHARED,
aeedacae SB	260	pdev->name, pdata) < 0) {
	261	dev_warn(&pdev->dev, "interrupt not available.\n");
	262	pdata->irq = -1;
	263	}
	264	}
	265
b0d42def	266	if (pdata->irq >= 0)
5b25a71b	267	device_init_wakeup(&pdev->dev, 1);
b0d42def AB	268	else
b0d42def AB	269	clear_bit(RTC_FEATURE_ALARM, pdata->rtc->features);
5b25a71b	270
b0d42def	271	pdata->rtc->ops = &mv_rtc_ops;
b46c5815 AB	272	pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	273	pdata->rtc->range_max = RTC_TIMESTAMP_END_2099;
	274
fdcfd854	275	ret = devm_rtc_register_device(pdata->rtc);
5b25a71b AB	276	if (!ret)
5b25a71b AB	277	return 0;
89c58c19 AL	278	out:
	279	if (!IS_ERR(pdata->clk))
	280	clk_disable_unprepare(pdata->clk);
	281
	282	return ret;
defb4514 SB	283	}
	284
	285	static int __exit mv_rtc_remove(struct platform_device *pdev)
	286	{
	287	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	288
aeedacae SB	289	if (pdata->irq >= 0)
	290	device_init_wakeup(&pdev->dev, 0);
	291
89c58c19 AL	292	if (!IS_ERR(pdata->clk))
	293	clk_disable_unprepare(pdata->clk);
	294
defb4514 SB	295	return 0;
	296	}
	297
ea983ede	298	#ifdef CONFIG_OF
4621bc56	299	static const struct of_device_id rtc_mv_of_match_table[] = {
77843504	300	{ .compatible = "marvell,orion-rtc", },
ea983ede JC	301	{}
ea983ede JC	302	};
73798d5c	303	MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
ea983ede JC	304	#endif
ea983ede JC	305
defb4514 SB	306	static struct platform_driver mv_rtc_driver = {
	307	.remove = __exit_p(mv_rtc_remove),
	308	.driver = {
	309	.name = "rtc-mv",
ea983ede	310	.of_match_table = of_match_ptr(rtc_mv_of_match_table),
defb4514 SB	311	},
	312	};
	313
1963f7cd	314	module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
defb4514 SB	315
	316	MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
	317	MODULE_DESCRIPTION("Marvell RTC driver");
	318	MODULE_LICENSE("GPL");
	319	MODULE_ALIAS("platform:rtc-mv");