[mirror_ubuntu-artful-kernel.git] / drivers / rtc / rtc-at91rm9200.c

/*
 *	Real Time Clock interface for Linux on Atmel AT91RM9200
 *
 *	Copyright (C) 2002 Rick Bronson
 *
 *	Converted to RTC class model by Andrew Victor
 *
 *	Ported to Linux 2.6 by Steven Scholz
 *	Based on s3c2410-rtc.c Simtec Electronics
 *
 *	Based on sa1100-rtc.c by Nils Faerber
 *	Based on rtc.c by Paul Gortmaker
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/time.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/interrupt.h>
#include <linux/ioctl.h>
#include <linux/completion.h>

#include <asm/uaccess.h>
#include <asm/rtc.h>

#include <asm/mach/time.h>

#include <asm/arch/at91_rtc.h>


#define AT91_RTC_FREQ		1
#define AT91_RTC_EPOCH		1900UL	/* just like arch/arm/common/rtctime.c */

static DECLARE_COMPLETION(at91_rtc_updated);
static unsigned int at91_alarm_year = AT91_RTC_EPOCH;

/*
 * Decode time/date into rtc_time structure
 */
static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
				struct rtc_time *tm)
{
	unsigned int time, date;

	/* must read twice in case it changes */
	do {
		time = at91_sys_read(timereg);
		date = at91_sys_read(calreg);
	} while ((time != at91_sys_read(timereg)) ||
			(date != at91_sys_read(calreg)));

	tm->tm_sec  = BCD2BIN((time & AT91_RTC_SEC) >> 0);
	tm->tm_min  = BCD2BIN((time & AT91_RTC_MIN) >> 8);
	tm->tm_hour = BCD2BIN((time & AT91_RTC_HOUR) >> 16);

	/*
	 * The Calendar Alarm register does not have a field for
	 * the year - so these will return an invalid value.  When an
	 * alarm is set, at91_alarm_year wille store the current year.
	 */
	tm->tm_year  = BCD2BIN(date & AT91_RTC_CENT) * 100;	/* century */
	tm->tm_year += BCD2BIN((date & AT91_RTC_YEAR) >> 8);	/* year */

	tm->tm_wday = BCD2BIN((date & AT91_RTC_DAY) >> 21) - 1;	/* day of the week [0-6], Sunday=0 */
	tm->tm_mon  = BCD2BIN((date & AT91_RTC_MONTH) >> 16) - 1;
	tm->tm_mday = BCD2BIN((date & AT91_RTC_DATE) >> 24);
}

/*
 * Read current time and date in RTC
 */
static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
{
	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	tm->tm_year = tm->tm_year - 1900;

	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
		tm->tm_hour, tm->tm_min, tm->tm_sec);

	return 0;
}

/*
 * Set current time and date in RTC
 */
static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
{
	unsigned long cr;

	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
		tm->tm_hour, tm->tm_min, tm->tm_sec);

	/* Stop Time/Calendar from counting */
	cr = at91_sys_read(AT91_RTC_CR);
	at91_sys_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);

	at91_sys_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
	wait_for_completion(&at91_rtc_updated);	/* wait for ACKUPD interrupt */
	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);

	at91_sys_write(AT91_RTC_TIMR,
			  BIN2BCD(tm->tm_sec) << 0
			| BIN2BCD(tm->tm_min) << 8
			| BIN2BCD(tm->tm_hour) << 16);

	at91_sys_write(AT91_RTC_CALR,
			  BIN2BCD((tm->tm_year + 1900) / 100)	/* century */
			| BIN2BCD(tm->tm_year % 100) << 8	/* year */
			| BIN2BCD(tm->tm_mon + 1) << 16		/* tm_mon starts at zero */
			| BIN2BCD(tm->tm_wday + 1) << 21	/* day of the week [0-6], Sunday=0 */
			| BIN2BCD(tm->tm_mday) << 24);

	/* Restart Time/Calendar */
	cr = at91_sys_read(AT91_RTC_CR);
	at91_sys_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));

	return 0;
}

/*
 * Read alarm time and date in RTC
 */
static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rtc_time *tm = &alrm->time;

	at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	tm->tm_year = at91_alarm_year - 1900;

	alrm->enabled = (at91_sys_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
			? 1 : 0;

	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
		tm->tm_hour, tm->tm_min, tm->tm_sec);

	return 0;
}

/*
 * Set alarm time and date in RTC
 */
static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct rtc_time tm;

	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);

	at91_alarm_year = tm.tm_year;

	tm.tm_hour = alrm->time.tm_hour;
	tm.tm_min = alrm->time.tm_min;
	tm.tm_sec = alrm->time.tm_sec;

	at91_sys_write(AT91_RTC_TIMALR,
		  BIN2BCD(tm.tm_sec) << 0
		| BIN2BCD(tm.tm_min) << 8
		| BIN2BCD(tm.tm_hour) << 16
		| AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN);
	at91_sys_write(AT91_RTC_CALALR,
		  BIN2BCD(tm.tm_mon + 1) << 16		/* tm_mon starts at zero */
		| BIN2BCD(tm.tm_mday) << 24
		| AT91_RTC_DATEEN | AT91_RTC_MTHEN);

	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
		at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
		tm.tm_min, tm.tm_sec);

	return 0;
}

/*
 * Handle commands from user-space
 */
static int at91_rtc_ioctl(struct device *dev, unsigned int cmd,
			unsigned long arg)
{
	int ret = 0;

	pr_debug("%s(): cmd=%08x, arg=%08lx.\n", __FUNCTION__, cmd, arg);

	switch (cmd) {
	case RTC_AIE_OFF:	/* alarm off */
		at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
		break;
	case RTC_AIE_ON:	/* alarm on */
		at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
		break;
	case RTC_UIE_OFF:	/* update off */
	case RTC_PIE_OFF:	/* periodic off */
		at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV);
		break;
	case RTC_UIE_ON:	/* update on */
	case RTC_PIE_ON:	/* periodic on */
		at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV);
		break;
	case RTC_IRQP_READ:	/* read periodic alarm frequency */
		ret = put_user(AT91_RTC_FREQ, (unsigned long *) arg);
		break;
	case RTC_IRQP_SET:	/* set periodic alarm frequency */
		if (arg != AT91_RTC_FREQ)
			ret = -EINVAL;
		break;
	default:
		ret = -ENOIOCTLCMD;
		break;
	}

	return ret;
}

/*
 * Provide additional RTC information in /proc/driver/rtc
 */
static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
{
	unsigned long imr = at91_sys_read(AT91_RTC_IMR);

	seq_printf(seq, "update_IRQ\t: %s\n",
			(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
	seq_printf(seq, "periodic_IRQ\t: %s\n",
			(imr & AT91_RTC_SECEV) ? "yes" : "no");
	seq_printf(seq, "periodic_freq\t: %ld\n",
			(unsigned long) AT91_RTC_FREQ);

	return 0;
}

/*
 * IRQ handler for the RTC
 */
static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct rtc_device *rtc = platform_get_drvdata(pdev);
	unsigned int rtsr;
	unsigned long events = 0;

	rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR);
	if (rtsr) {		/* this interrupt is shared!  Is it ours? */
		if (rtsr & AT91_RTC_ALARM)
			events |= (RTC_AF | RTC_IRQF);
		if (rtsr & AT91_RTC_SECEV)
			events |= (RTC_UF | RTC_IRQF);
		if (rtsr & AT91_RTC_ACKUPD)
			complete(&at91_rtc_updated);

		at91_sys_write(AT91_RTC_SCCR, rtsr);	/* clear status reg */

		rtc_update_irq(&rtc->class_dev, 1, events);

		pr_debug("%s(): num=%ld, events=0x%02lx\n", __FUNCTION__,
			events >> 8, events & 0x000000FF);

		return IRQ_HANDLED;
	}
	return IRQ_NONE;		/* not handled */
}

static const struct rtc_class_ops at91_rtc_ops = {
	.ioctl		= at91_rtc_ioctl,
	.read_time	= at91_rtc_readtime,
	.set_time	= at91_rtc_settime,
	.read_alarm	= at91_rtc_readalarm,
	.set_alarm	= at91_rtc_setalarm,
	.proc		= at91_rtc_proc,
};

/*
 * Initialize and install RTC driver
 */
static int __init at91_rtc_probe(struct platform_device *pdev)
{
	struct rtc_device *rtc;
	int ret;

	at91_sys_write(AT91_RTC_CR, 0);
	at91_sys_write(AT91_RTC_MR, 0);		/* 24 hour mode */

	/* Disable all interrupts */
	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
					AT91_RTC_SECEV | AT91_RTC_TIMEV |
					AT91_RTC_CALEV);

	ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
				IRQF_DISABLED | IRQF_SHARED,
				"at91_rtc", pdev);
	if (ret) {
		printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n",
				AT91_ID_SYS);
		return ret;
	}

	rtc = rtc_device_register(pdev->name, &pdev->dev,
				&at91_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc)) {
		free_irq(AT91_ID_SYS, pdev);
		return PTR_ERR(rtc);
	}
	platform_set_drvdata(pdev, rtc);
	device_init_wakeup(&pdev->dev, 1);

	printk(KERN_INFO "AT91 Real Time Clock driver.\n");
	return 0;
}

/*
 * Disable and remove the RTC driver
 */
static int __devexit at91_rtc_remove(struct platform_device *pdev)
{
	struct rtc_device *rtc = platform_get_drvdata(pdev);

	/* Disable all interrupts */
	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
					AT91_RTC_SECEV | AT91_RTC_TIMEV |
					AT91_RTC_CALEV);
	free_irq(AT91_ID_SYS, pdev);

	rtc_device_unregister(rtc);
	platform_set_drvdata(pdev, NULL);
	device_init_wakeup(&pdev->dev, 0);

	return 0;
}

#ifdef CONFIG_PM

/* AT91RM9200 RTC Power management control */

static struct timespec at91_rtc_delta;
static u32 at91_rtc_imr;

static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct rtc_time tm;
	struct timespec time;

	time.tv_nsec = 0;

	/* calculate time delta for suspend */
	at91_rtc_readtime(&pdev->dev, &tm);
	rtc_tm_to_time(&tm, &time.tv_sec);
	save_time_delta(&at91_rtc_delta, &time);

	/* this IRQ is shared with DBGU and other hardware which isn't
	 * necessarily doing PM like we are...
	 */
	at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)
			& (AT91_RTC_ALARM|AT91_RTC_SECEV);
	if (at91_rtc_imr) {
		if (device_may_wakeup(&pdev->dev))
			enable_irq_wake(AT91_ID_SYS);
		else
			at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);
	}

	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
		1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,
		tm.tm_hour, tm.tm_min, tm.tm_sec);

	return 0;
}

static int at91_rtc_resume(struct platform_device *pdev)
{
	struct rtc_time tm;
	struct timespec time;

	time.tv_nsec = 0;

	at91_rtc_readtime(&pdev->dev, &tm);
	rtc_tm_to_time(&tm, &time.tv_sec);
	restore_time_delta(&at91_rtc_delta, &time);

	if (at91_rtc_imr) {
		if (device_may_wakeup(&pdev->dev))
			disable_irq_wake(AT91_ID_SYS);
		else
			at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
	}

	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
		1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,
		tm.tm_hour, tm.tm_min, tm.tm_sec);

	return 0;
}
#else
#define at91_rtc_suspend NULL
#define at91_rtc_resume  NULL
#endif

static struct platform_driver at91_rtc_driver = {
	.probe		= at91_rtc_probe,
	.remove		= at91_rtc_remove,
	.suspend	= at91_rtc_suspend,
	.resume		= at91_rtc_resume,
	.driver		= {
		.name	= "at91_rtc",
		.owner	= THIS_MODULE,
	},
};

static int __init at91_rtc_init(void)
{
	return platform_driver_register(&at91_rtc_driver);
}

static void __exit at91_rtc_exit(void)
{
	platform_driver_unregister(&at91_rtc_driver);
}

module_init(at91_rtc_init);
module_exit(at91_rtc_exit);

MODULE_AUTHOR("Rick Bronson");
MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
MODULE_LICENSE("GPL");
Commit	Line	Data
788b1fc6 AV	1	/*
	2	* Real Time Clock interface for Linux on Atmel AT91RM9200
	3	*
	4	* Copyright (C) 2002 Rick Bronson
	5	*
	6	* Converted to RTC class model by Andrew Victor
	7	*
	8	* Ported to Linux 2.6 by Steven Scholz
	9	* Based on s3c2410-rtc.c Simtec Electronics
	10	*
	11	* Based on sa1100-rtc.c by Nils Faerber
	12	* Based on rtc.c by Paul Gortmaker
	13	*
	14	* This program is free software; you can redistribute it and/or
	15	* modify it under the terms of the GNU General Public License
	16	* as published by the Free Software Foundation; either version
	17	* 2 of the License, or (at your option) any later version.
	18	*
	19	*/
	20
	21	#include <linux/module.h>
	22	#include <linux/kernel.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/time.h>
	25	#include <linux/rtc.h>
	26	#include <linux/bcd.h>
	27	#include <linux/interrupt.h>
	28	#include <linux/ioctl.h>
	29	#include <linux/completion.h>
	30
	31	#include <asm/uaccess.h>
	32	#include <asm/rtc.h>
	33
	34	#include <asm/mach/time.h>
	35
d73e3cd7 DB	36	#include <asm/arch/at91_rtc.h>
d73e3cd7 DB	37
788b1fc6 AV	38
	39	#define AT91_RTC_FREQ 1
	40	#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */
	41
	42	static DECLARE_COMPLETION(at91_rtc_updated);
	43	static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
	44
788b1fc6 AV	45	/*
	46	* Decode time/date into rtc_time structure
	47	*/
e7a8bb12 AM	48	static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
e7a8bb12 AM	49	struct rtc_time *tm)
788b1fc6 AV	50	{
	51	unsigned int time, date;
	52
	53	/* must read twice in case it changes */
	54	do {
	55	time = at91_sys_read(timereg);
	56	date = at91_sys_read(calreg);
e7a8bb12 AM	57	} while ((time != at91_sys_read(timereg)) \|\|
e7a8bb12 AM	58	(date != at91_sys_read(calreg)));
788b1fc6 AV	59
	60	tm->tm_sec = BCD2BIN((time & AT91_RTC_SEC) >> 0);
	61	tm->tm_min = BCD2BIN((time & AT91_RTC_MIN) >> 8);
	62	tm->tm_hour = BCD2BIN((time & AT91_RTC_HOUR) >> 16);
	63
	64	/*
	65	* The Calendar Alarm register does not have a field for
	66	* the year - so these will return an invalid value. When an
	67	* alarm is set, at91_alarm_year wille store the current year.
	68	*/
e7a8bb12 AM	69	tm->tm_year = BCD2BIN(date & AT91_RTC_CENT) * 100; /* century */
e7a8bb12 AM	70	tm->tm_year += BCD2BIN((date & AT91_RTC_YEAR) >> 8); /* year */
788b1fc6 AV	71
	72	tm->tm_wday = BCD2BIN((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */
	73	tm->tm_mon = BCD2BIN((date & AT91_RTC_MONTH) >> 16) - 1;
	74	tm->tm_mday = BCD2BIN((date & AT91_RTC_DATE) >> 24);
	75	}
	76
	77	/*
	78	* Read current time and date in RTC
	79	*/
	80	static int at91_rtc_readtime(struct device dev, struct rtc_time tm)
	81	{
	82	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
	83	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	84	tm->tm_year = tm->tm_year - 1900;
	85
	86	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
e7a8bb12 AM	87	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	88	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	89
	90	return 0;
	91	}
	92
	93	/*
	94	* Set current time and date in RTC
	95	*/
	96	static int at91_rtc_settime(struct device dev, struct rtc_time tm)
	97	{
	98	unsigned long cr;
	99
	100	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
e7a8bb12 AM	101	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	102	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	103
	104	/* Stop Time/Calendar from counting */
	105	cr = at91_sys_read(AT91_RTC_CR);
	106	at91_sys_write(AT91_RTC_CR, cr \| AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM);
	107
	108	at91_sys_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
e7a8bb12	109	wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
788b1fc6 AV	110	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
	111
	112	at91_sys_write(AT91_RTC_TIMR,
	113	BIN2BCD(tm->tm_sec) << 0
	114	\| BIN2BCD(tm->tm_min) << 8
	115	\| BIN2BCD(tm->tm_hour) << 16);
	116
	117	at91_sys_write(AT91_RTC_CALR,
e7a8bb12 AM	118	BIN2BCD((tm->tm_year + 1900) / 100) /* century */
	119	\| BIN2BCD(tm->tm_year % 100) << 8 /* year */
	120	\| BIN2BCD(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */
	121	\| BIN2BCD(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */
788b1fc6 AV	122	\| BIN2BCD(tm->tm_mday) << 24);
	123
	124	/* Restart Time/Calendar */
	125	cr = at91_sys_read(AT91_RTC_CR);
	126	at91_sys_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM));
	127
	128	return 0;
	129	}
	130
	131	/*
	132	* Read alarm time and date in RTC
	133	*/
	134	static int at91_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	135	{
	136	struct rtc_time *tm = &alrm->time;
	137
	138	at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
	139	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	140	tm->tm_year = at91_alarm_year - 1900;
	141
a2db8dfc DB	142	alrm->enabled = (at91_sys_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
	143	? 1 : 0;
	144
788b1fc6	145	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
e7a8bb12 AM	146	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	147	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	148
	149	return 0;
	150	}
	151
	152	/*
	153	* Set alarm time and date in RTC
	154	*/
	155	static int at91_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	156	{
	157	struct rtc_time tm;
	158
	159	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
	160
	161	at91_alarm_year = tm.tm_year;
	162
	163	tm.tm_hour = alrm->time.tm_hour;
	164	tm.tm_min = alrm->time.tm_min;
	165	tm.tm_sec = alrm->time.tm_sec;
	166
	167	at91_sys_write(AT91_RTC_TIMALR,
	168	BIN2BCD(tm.tm_sec) << 0
	169	\| BIN2BCD(tm.tm_min) << 8
	170	\| BIN2BCD(tm.tm_hour) << 16
	171	\| AT91_RTC_HOUREN \| AT91_RTC_MINEN \| AT91_RTC_SECEN);
	172	at91_sys_write(AT91_RTC_CALALR,
	173	BIN2BCD(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */
	174	\| BIN2BCD(tm.tm_mday) << 24
	175	\| AT91_RTC_DATEEN \| AT91_RTC_MTHEN);
	176
	177	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
e7a8bb12 AM	178	at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
e7a8bb12 AM	179	tm.tm_min, tm.tm_sec);
788b1fc6 AV	180
	181	return 0;
	182	}
	183
	184	/*
	185	* Handle commands from user-space
	186	*/
e7a8bb12 AM	187	static int at91_rtc_ioctl(struct device *dev, unsigned int cmd,
e7a8bb12 AM	188	unsigned long arg)
788b1fc6 AV	189	{
	190	int ret = 0;
	191
	192	pr_debug("%s(): cmd=%08x, arg=%08lx.\n", __FUNCTION__, cmd, arg);
	193
	194	switch (cmd) {
	195	case RTC_AIE_OFF: /* alarm off */
	196	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
	197	break;
	198	case RTC_AIE_ON: /* alarm on */
	199	at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
	200	break;
	201	case RTC_UIE_OFF: /* update off */
	202	case RTC_PIE_OFF: /* periodic off */
	203	at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV);
	204	break;
	205	case RTC_UIE_ON: /* update on */
	206	case RTC_PIE_ON: /* periodic on */
	207	at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV);
	208	break;
	209	case RTC_IRQP_READ: /* read periodic alarm frequency */
	210	ret = put_user(AT91_RTC_FREQ, (unsigned long *) arg);
	211	break;
	212	case RTC_IRQP_SET: /* set periodic alarm frequency */
	213	if (arg != AT91_RTC_FREQ)
	214	ret = -EINVAL;
	215	break;
	216	default:
	217	ret = -ENOIOCTLCMD;
	218	break;
	219	}
	220
	221	return ret;
	222	}
	223
	224	/*
	225	* Provide additional RTC information in /proc/driver/rtc
	226	*/
	227	static int at91_rtc_proc(struct device dev, struct seq_file seq)
	228	{
	229	unsigned long imr = at91_sys_read(AT91_RTC_IMR);
	230
e7a8bb12 AM	231	seq_printf(seq, "update_IRQ\t: %s\n",
	232	(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
	233	seq_printf(seq, "periodic_IRQ\t: %s\n",
	234	(imr & AT91_RTC_SECEV) ? "yes" : "no");
	235	seq_printf(seq, "periodic_freq\t: %ld\n",
	236	(unsigned long) AT91_RTC_FREQ);
788b1fc6 AV	237
	238	return 0;
	239	}
	240
	241	/*
	242	* IRQ handler for the RTC
	243	*/
7d12e780	244	static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
788b1fc6	245	{
e7a8bb12	246	struct platform_device *pdev = dev_id;
788b1fc6 AV	247	struct rtc_device *rtc = platform_get_drvdata(pdev);
	248	unsigned int rtsr;
	249	unsigned long events = 0;
	250
	251	rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR);
	252	if (rtsr) { /* this interrupt is shared! Is it ours? */
	253	if (rtsr & AT91_RTC_ALARM)
	254	events \|= (RTC_AF \| RTC_IRQF);
	255	if (rtsr & AT91_RTC_SECEV)
	256	events \|= (RTC_UF \| RTC_IRQF);
	257	if (rtsr & AT91_RTC_ACKUPD)
	258	complete(&at91_rtc_updated);
	259
e7a8bb12	260	at91_sys_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
788b1fc6 AV	261
	262	rtc_update_irq(&rtc->class_dev, 1, events);
	263
	264	pr_debug("%s(): num=%ld, events=0x%02lx\n", __FUNCTION__,
	265	events >> 8, events & 0x000000FF);
	266
	267	return IRQ_HANDLED;
	268	}
	269	return IRQ_NONE; /* not handled */
	270	}
	271
ff8371ac	272	static const struct rtc_class_ops at91_rtc_ops = {
788b1fc6 AV	273	.ioctl = at91_rtc_ioctl,
	274	.read_time = at91_rtc_readtime,
	275	.set_time = at91_rtc_settime,
	276	.read_alarm = at91_rtc_readalarm,
	277	.set_alarm = at91_rtc_setalarm,
	278	.proc = at91_rtc_proc,
	279	};
	280
	281	/*
	282	* Initialize and install RTC driver
	283	*/
	284	static int __init at91_rtc_probe(struct platform_device *pdev)
	285	{
	286	struct rtc_device *rtc;
	287	int ret;
	288
	289	at91_sys_write(AT91_RTC_CR, 0);
	290	at91_sys_write(AT91_RTC_MR, 0); /* 24 hour mode */
	291
	292	/* Disable all interrupts */
e7a8bb12 AM	293	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
	294	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
	295	AT91_RTC_CALEV);
788b1fc6	296
e7a8bb12	297	ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
d728b1e6 DB	298	IRQF_DISABLED \| IRQF_SHARED,
d728b1e6 DB	299	"at91_rtc", pdev);
788b1fc6	300	if (ret) {
e7a8bb12 AM	301	printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n",
e7a8bb12 AM	302	AT91_ID_SYS);
788b1fc6 AV	303	return ret;
	304	}
	305
e7a8bb12 AM	306	rtc = rtc_device_register(pdev->name, &pdev->dev,
e7a8bb12 AM	307	&at91_rtc_ops, THIS_MODULE);
788b1fc6 AV	308	if (IS_ERR(rtc)) {
	309	free_irq(AT91_ID_SYS, pdev);
	310	return PTR_ERR(rtc);
	311	}
	312	platform_set_drvdata(pdev, rtc);
90b4d648	313	device_init_wakeup(&pdev->dev, 1);
788b1fc6 AV	314
	315	printk(KERN_INFO "AT91 Real Time Clock driver.\n");
	316	return 0;
	317	}
	318
	319	/*
	320	* Disable and remove the RTC driver
	321	*/
	322	static int __devexit at91_rtc_remove(struct platform_device *pdev)
	323	{
	324	struct rtc_device *rtc = platform_get_drvdata(pdev);
	325
	326	/* Disable all interrupts */
e7a8bb12 AM	327	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
	328	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
	329	AT91_RTC_CALEV);
788b1fc6 AV	330	free_irq(AT91_ID_SYS, pdev);
	331
	332	rtc_device_unregister(rtc);
	333	platform_set_drvdata(pdev, NULL);
90b4d648	334	device_init_wakeup(&pdev->dev, 0);
788b1fc6 AV	335
	336	return 0;
	337	}
	338
	339	#ifdef CONFIG_PM
	340
	341	/* AT91RM9200 RTC Power management control */
	342
	343	static struct timespec at91_rtc_delta;
90b4d648	344	static u32 at91_rtc_imr;
788b1fc6 AV	345
	346	static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
	347	{
	348	struct rtc_time tm;
	349	struct timespec time;
	350
	351	time.tv_nsec = 0;
	352
	353	/* calculate time delta for suspend */
	354	at91_rtc_readtime(&pdev->dev, &tm);
	355	rtc_tm_to_time(&tm, &time.tv_sec);
	356	save_time_delta(&at91_rtc_delta, &time);
	357
90b4d648 DB	358	/* this IRQ is shared with DBGU and other hardware which isn't
	359	* necessarily doing PM like we are...
	360	*/
	361	at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)
	362	& (AT91_RTC_ALARM\|AT91_RTC_SECEV);
	363	if (at91_rtc_imr) {
	364	if (device_may_wakeup(&pdev->dev))
	365	enable_irq_wake(AT91_ID_SYS);
	366	else
	367	at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);
	368	}
	369
788b1fc6	370	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
e7a8bb12 AM	371	1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,
e7a8bb12 AM	372	tm.tm_hour, tm.tm_min, tm.tm_sec);
788b1fc6 AV	373
	374	return 0;
	375	}
	376
	377	static int at91_rtc_resume(struct platform_device *pdev)
	378	{
	379	struct rtc_time tm;
	380	struct timespec time;
	381
	382	time.tv_nsec = 0;
	383
	384	at91_rtc_readtime(&pdev->dev, &tm);
	385	rtc_tm_to_time(&tm, &time.tv_sec);
	386	restore_time_delta(&at91_rtc_delta, &time);
	387
90b4d648 DB	388	if (at91_rtc_imr) {
	389	if (device_may_wakeup(&pdev->dev))
	390	disable_irq_wake(AT91_ID_SYS);
	391	else
	392	at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
	393	}
	394
788b1fc6	395	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __FUNCTION__,
e7a8bb12 AM	396	1900 + tm.tm_year, tm.tm_mon, tm.tm_mday,
e7a8bb12 AM	397	tm.tm_hour, tm.tm_min, tm.tm_sec);
788b1fc6 AV	398
	399	return 0;
	400	}
	401	#else
	402	#define at91_rtc_suspend NULL
	403	#define at91_rtc_resume NULL
	404	#endif
	405
	406	static struct platform_driver at91_rtc_driver = {
	407	.probe = at91_rtc_probe,
	408	.remove = at91_rtc_remove,
	409	.suspend = at91_rtc_suspend,
	410	.resume = at91_rtc_resume,
	411	.driver = {
	412	.name = "at91_rtc",
	413	.owner = THIS_MODULE,
	414	},
	415	};
	416
	417	static int __init at91_rtc_init(void)
	418	{
	419	return platform_driver_register(&at91_rtc_driver);
	420	}
	421
	422	static void __exit at91_rtc_exit(void)
	423	{
	424	platform_driver_unregister(&at91_rtc_driver);
	425	}
	426
788b1fc6 AV	427	module_init(at91_rtc_init);
	428	module_exit(at91_rtc_exit);
	429
	430	MODULE_AUTHOR("Rick Bronson");
	431	MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
	432	MODULE_LICENSE("GPL");