[linux-2.6-block.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/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;

	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 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,
};

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;
	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 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);

	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 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
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>
fe561336	13	#include <linux/bitops.h>
defb4514 SB	14	#include <linux/io.h>
defb4514 SB	15	#include <linux/platform_device.h>
ea983ede	16	#include <linux/of.h>
9d1d4f9e	17	#include <linux/delay.h>
89c58c19	18	#include <linux/clk.h>
5a0e3ad6	19	#include <linux/gfp.h>
2113852b	20	#include <linux/module.h>
defb4514 SB	21
	22
	23	#define RTC_TIME_REG_OFFS 0
	24	#define RTC_SECONDS_OFFS 0
	25	#define RTC_MINUTES_OFFS 8
	26	#define RTC_HOURS_OFFS 16
	27	#define RTC_WDAY_OFFS 24
fe561336	28	#define RTC_HOURS_12H_MODE BIT(22) /* 12 hour mode */
defb4514 SB	29
	30	#define RTC_DATE_REG_OFFS 4
	31	#define RTC_MDAY_OFFS 0
	32	#define RTC_MONTH_OFFS 8
	33	#define RTC_YEAR_OFFS 16
	34
aeedacae SB	35	#define RTC_ALARM_TIME_REG_OFFS 8
aeedacae SB	36	#define RTC_ALARM_DATE_REG_OFFS 0xc
fe561336	37	#define RTC_ALARM_VALID BIT(7)
aeedacae SB	38
	39	#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
	40	#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
defb4514 SB	41
	42	struct rtc_plat_data {
	43	struct rtc_device *rtc;
	44	void __iomem *ioaddr;
aeedacae	45	int irq;
89c58c19	46	struct clk *clk;
defb4514 SB	47	};
	48
	49	static int mv_rtc_set_time(struct device dev, struct rtc_time tm)
	50	{
	51	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	52	void __iomem *ioaddr = pdata->ioaddr;
	53	u32 rtc_reg;
	54
	55	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) \|
	56	(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) \|
	57	(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) \|
	58	(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	59	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
	60
	61	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) \|
	62	(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) \|
	63	(bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
	64	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
	65
	66	return 0;
	67	}
	68
	69	static int mv_rtc_read_time(struct device dev, struct rtc_time tm)
	70	{
	71	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	72	void __iomem *ioaddr = pdata->ioaddr;
	73	u32 rtc_time, rtc_date;
	74	unsigned int year, month, day, hour, minute, second, wday;
	75
	76	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	77	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
	78
	79	second = rtc_time & 0x7f;
	80	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
4042a147	81	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
defb4514 SB	82	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
	83
	84	day = rtc_date & 0x3f;
	85	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	86	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
	87
	88	tm->tm_sec = bcd2bin(second);
	89	tm->tm_min = bcd2bin(minute);
	90	tm->tm_hour = bcd2bin(hour);
	91	tm->tm_mday = bcd2bin(day);
	92	tm->tm_wday = bcd2bin(wday);
	93	tm->tm_mon = bcd2bin(month) - 1;
	94	/* hw counts from year 2000, but tm_year is relative to 1900 */
	95	tm->tm_year = bcd2bin(year) + 100;
	96
22652ba7	97	return 0;
defb4514 SB	98	}
defb4514 SB	99
aeedacae SB	100	static int mv_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	101	{
	102	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	103	void __iomem *ioaddr = pdata->ioaddr;
	104	u32 rtc_time, rtc_date;
	105	unsigned int year, month, day, hour, minute, second, wday;
	106
	107	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
	108	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
	109
	110	second = rtc_time & 0x7f;
	111	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
4042a147	112	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
aeedacae SB	113	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
	114
	115	day = rtc_date & 0x3f;
	116	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	117	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
	118
	119	alm->time.tm_sec = bcd2bin(second);
	120	alm->time.tm_min = bcd2bin(minute);
	121	alm->time.tm_hour = bcd2bin(hour);
	122	alm->time.tm_mday = bcd2bin(day);
	123	alm->time.tm_wday = bcd2bin(wday);
	124	alm->time.tm_mon = bcd2bin(month) - 1;
	125	/* hw counts from year 2000, but tm_year is relative to 1900 */
	126	alm->time.tm_year = bcd2bin(year) + 100;
	127
	128	if (rtc_valid_tm(&alm->time) < 0) {
	129	dev_err(dev, "retrieved alarm date/time is not valid.\n");
	130	rtc_time_to_tm(0, &alm->time);
	131	}
	132
	133	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	134	return 0;
	135	}
	136
	137	static int mv_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	138	{
	139	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	140	void __iomem *ioaddr = pdata->ioaddr;
	141	u32 rtc_reg = 0;
	142
	143	if (alm->time.tm_sec >= 0)
	144	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_sec))
	145	<< RTC_SECONDS_OFFS;
	146	if (alm->time.tm_min >= 0)
	147	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_min))
	148	<< RTC_MINUTES_OFFS;
	149	if (alm->time.tm_hour >= 0)
	150	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_hour))
	151	<< RTC_HOURS_OFFS;
	152
	153	writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
	154
	155	if (alm->time.tm_mday >= 0)
	156	rtc_reg = (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mday))
	157	<< RTC_MDAY_OFFS;
	158	else
	159	rtc_reg = 0;
	160
	161	if (alm->time.tm_mon >= 0)
	162	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mon + 1))
	163	<< RTC_MONTH_OFFS;
	164
	165	if (alm->time.tm_year >= 0)
	166	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_year % 100))
	167	<< RTC_YEAR_OFFS;
	168
	169	writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
	170	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
	171	writel(alm->enabled ? 1 : 0,
	172	ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	173
	174	return 0;
	175	}
	176
16380c15	177	static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
aeedacae	178	{
85368bb9	179	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
aeedacae SB	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;
89c58c19	225	int ret = 0;
defb4514	226
defb4514 SB	227	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	228	if (!pdata)
	229	return -ENOMEM;
	230
7c1d69ee JL	231	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	232	pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
	233	if (IS_ERR(pdata->ioaddr))
	234	return PTR_ERR(pdata->ioaddr);
defb4514	235
89c58c19 AL	236	pdata->clk = devm_clk_get(&pdev->dev, NULL);
	237	/* Not all SoCs require a clock.*/
	238	if (!IS_ERR(pdata->clk))
	239	clk_prepare_enable(pdata->clk);
	240
4042a147	241	/* make sure the 24 hour mode is enabled */
defb4514 SB	242	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
defb4514 SB	243	if (rtc_time & RTC_HOURS_12H_MODE) {
4042a147	244	dev_err(&pdev->dev, "12 Hour mode is enabled but not supported.\n");
89c58c19 AL	245	ret = -EINVAL;
89c58c19 AL	246	goto out;
defb4514 SB	247	}
defb4514 SB	248
9d1d4f9e NP	249	/* make sure it is actually functional */
	250	if (rtc_time == 0x01000000) {
	251	ssleep(1);
	252	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	253	if (rtc_time == 0x01000000) {
	254	dev_err(&pdev->dev, "internal RTC not ticking\n");
89c58c19 AL	255	ret = -ENODEV;
89c58c19 AL	256	goto out;
9d1d4f9e NP	257	}
	258	}
	259
aeedacae SB	260	pdata->irq = platform_get_irq(pdev, 0);
aeedacae SB	261
defb4514	262	platform_set_drvdata(pdev, pdata);
aeedacae SB	263
	264	if (pdata->irq >= 0) {
	265	device_init_wakeup(&pdev->dev, 1);
4241e2b8	266	pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
aeedacae SB	267	&mv_rtc_alarm_ops,
aeedacae SB	268	THIS_MODULE);
4241e2b8 JH	269	} else {
4241e2b8 JH	270	pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
aeedacae	271	&mv_rtc_ops, THIS_MODULE);
4241e2b8	272	}
89c58c19 AL	273	if (IS_ERR(pdata->rtc)) {
	274	ret = PTR_ERR(pdata->rtc);
	275	goto out;
	276	}
defb4514	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,
2f6e5f94	281	IRQF_SHARED,
aeedacae SB	282	pdev->name, pdata) < 0) {
	283	dev_warn(&pdev->dev, "interrupt not available.\n");
	284	pdata->irq = -1;
	285	}
	286	}
	287
defb4514	288	return 0;
89c58c19 AL	289	out:
	290	if (!IS_ERR(pdata->clk))
	291	clk_disable_unprepare(pdata->clk);
	292
	293	return ret;
defb4514 SB	294	}
	295
	296	static int __exit mv_rtc_remove(struct platform_device *pdev)
	297	{
	298	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	299
aeedacae SB	300	if (pdata->irq >= 0)
	301	device_init_wakeup(&pdev->dev, 0);
	302
89c58c19 AL	303	if (!IS_ERR(pdata->clk))
	304	clk_disable_unprepare(pdata->clk);
	305
defb4514 SB	306	return 0;
	307	}
	308
ea983ede	309	#ifdef CONFIG_OF
4621bc56	310	static const struct of_device_id rtc_mv_of_match_table[] = {
77843504	311	{ .compatible = "marvell,orion-rtc", },
ea983ede JC	312	{}
ea983ede JC	313	};
73798d5c	314	MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
ea983ede JC	315	#endif
ea983ede JC	316
defb4514 SB	317	static struct platform_driver mv_rtc_driver = {
	318	.remove = __exit_p(mv_rtc_remove),
	319	.driver = {
	320	.name = "rtc-mv",
ea983ede	321	.of_match_table = of_match_ptr(rtc_mv_of_match_table),
defb4514 SB	322	},
	323	};
	324
1963f7cd	325	module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
defb4514 SB	326
	327	MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
	328	MODULE_DESCRIPTION("Marvell RTC driver");
	329	MODULE_LICENSE("GPL");
	330	MODULE_ALIAS("platform:rtc-mv");