[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 <mach/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", __func__,
		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", __func__,
		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", __func__,
		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_IDR, AT91_RTC_ALARM);
	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);

	if (alrm->enabled) {
		at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
		at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
	}

	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
		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", __func__, cmd, arg);

	/* important:  scrub old status before enabling IRQs */
	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_SCCR, AT91_RTC_ALARM);
		at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
		break;
	case RTC_UIE_OFF:	/* update off */
		at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV);
		break;
	case RTC_UIE_ON:	/* update on */
		at91_sys_write(AT91_RTC_SCCR, AT91_RTC_SECEV);
		at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV);
		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, 1, events);

		pr_debug("%s(): num=%ld, events=0x%02lx\n", __func__,
			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;
	}

	/* cpu init code should really have flagged this device as
	 * being wake-capable; if it didn't, do that here.
	 */
	if (!device_can_wakeup(&pdev->dev))
		device_init_wakeup(&pdev->dev, 1);

	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);

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

/*
 * Disable and remove the RTC driver
 */
static int __exit 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);

	return 0;
}

#ifdef CONFIG_PM

/* AT91RM9200 RTC Power management control */

static u32 at91_rtc_imr;

static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
{
	/* 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);
	}
	return 0;
}

static int at91_rtc_resume(struct platform_device *pdev)
{
	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);
	}
	return 0;
}
#else
#define at91_rtc_suspend NULL
#define at91_rtc_resume  NULL
#endif

static struct platform_driver at91_rtc_driver = {
	.remove		= __exit_p(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_probe(&at91_rtc_driver, at91_rtc_probe);
}

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");
MODULE_ALIAS("platform:at91_rtc");
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>
a09e64fb	32	#include <mach/at91_rtc.h>
d73e3cd7	33
788b1fc6 AV	34
	35	#define AT91_RTC_FREQ 1
	36	#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */
	37
	38	static DECLARE_COMPLETION(at91_rtc_updated);
	39	static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
	40
788b1fc6 AV	41	/*
	42	* Decode time/date into rtc_time structure
	43	*/
e7a8bb12 AM	44	static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
e7a8bb12 AM	45	struct rtc_time *tm)
788b1fc6 AV	46	{
	47	unsigned int time, date;
	48
	49	/* must read twice in case it changes */
	50	do {
	51	time = at91_sys_read(timereg);
	52	date = at91_sys_read(calreg);
e7a8bb12 AM	53	} while ((time != at91_sys_read(timereg)) \|\|
e7a8bb12 AM	54	(date != at91_sys_read(calreg)));
788b1fc6 AV	55
	56	tm->tm_sec = BCD2BIN((time & AT91_RTC_SEC) >> 0);
	57	tm->tm_min = BCD2BIN((time & AT91_RTC_MIN) >> 8);
	58	tm->tm_hour = BCD2BIN((time & AT91_RTC_HOUR) >> 16);
	59
	60	/*
	61	* The Calendar Alarm register does not have a field for
	62	* the year - so these will return an invalid value. When an
	63	* alarm is set, at91_alarm_year wille store the current year.
	64	*/
e7a8bb12 AM	65	tm->tm_year = BCD2BIN(date & AT91_RTC_CENT) * 100; /* century */
e7a8bb12 AM	66	tm->tm_year += BCD2BIN((date & AT91_RTC_YEAR) >> 8); /* year */
788b1fc6 AV	67
	68	tm->tm_wday = BCD2BIN((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */
	69	tm->tm_mon = BCD2BIN((date & AT91_RTC_MONTH) >> 16) - 1;
	70	tm->tm_mday = BCD2BIN((date & AT91_RTC_DATE) >> 24);
	71	}
	72
	73	/*
	74	* Read current time and date in RTC
	75	*/
	76	static int at91_rtc_readtime(struct device dev, struct rtc_time tm)
	77	{
	78	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
	79	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	80	tm->tm_year = tm->tm_year - 1900;
	81
2a4e2b87	82	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	83	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	84	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	85
	86	return 0;
	87	}
	88
	89	/*
	90	* Set current time and date in RTC
	91	*/
	92	static int at91_rtc_settime(struct device dev, struct rtc_time tm)
	93	{
	94	unsigned long cr;
	95
2a4e2b87	96	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	97	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	98	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	99
	100	/* Stop Time/Calendar from counting */
	101	cr = at91_sys_read(AT91_RTC_CR);
	102	at91_sys_write(AT91_RTC_CR, cr \| AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM);
	103
	104	at91_sys_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
e7a8bb12	105	wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
788b1fc6 AV	106	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
	107
	108	at91_sys_write(AT91_RTC_TIMR,
	109	BIN2BCD(tm->tm_sec) << 0
	110	\| BIN2BCD(tm->tm_min) << 8
	111	\| BIN2BCD(tm->tm_hour) << 16);
	112
	113	at91_sys_write(AT91_RTC_CALR,
e7a8bb12 AM	114	BIN2BCD((tm->tm_year + 1900) / 100) /* century */
	115	\| BIN2BCD(tm->tm_year % 100) << 8 /* year */
	116	\| BIN2BCD(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */
	117	\| BIN2BCD(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */
788b1fc6 AV	118	\| BIN2BCD(tm->tm_mday) << 24);
	119
	120	/* Restart Time/Calendar */
	121	cr = at91_sys_read(AT91_RTC_CR);
	122	at91_sys_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM));
	123
	124	return 0;
	125	}
	126
	127	/*
	128	* Read alarm time and date in RTC
	129	*/
	130	static int at91_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	131	{
	132	struct rtc_time *tm = &alrm->time;
	133
	134	at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
	135	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	136	tm->tm_year = at91_alarm_year - 1900;
	137
a2db8dfc DB	138	alrm->enabled = (at91_sys_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
	139	? 1 : 0;
	140
2a4e2b87	141	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	142	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	143	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	144
	145	return 0;
	146	}
	147
	148	/*
	149	* Set alarm time and date in RTC
	150	*/
	151	static int at91_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	152	{
	153	struct rtc_time tm;
	154
	155	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
	156
	157	at91_alarm_year = tm.tm_year;
	158
	159	tm.tm_hour = alrm->time.tm_hour;
	160	tm.tm_min = alrm->time.tm_min;
	161	tm.tm_sec = alrm->time.tm_sec;
	162
5d4675a8	163	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
788b1fc6 AV	164	at91_sys_write(AT91_RTC_TIMALR,
	165	BIN2BCD(tm.tm_sec) << 0
	166	\| BIN2BCD(tm.tm_min) << 8
	167	\| BIN2BCD(tm.tm_hour) << 16
	168	\| AT91_RTC_HOUREN \| AT91_RTC_MINEN \| AT91_RTC_SECEN);
	169	at91_sys_write(AT91_RTC_CALALR,
	170	BIN2BCD(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */
	171	\| BIN2BCD(tm.tm_mday) << 24
	172	\| AT91_RTC_DATEEN \| AT91_RTC_MTHEN);
	173
449321b3 DB	174	if (alrm->enabled) {
449321b3 DB	175	at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
5d4675a8	176	at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
449321b3	177	}
5d4675a8	178
2a4e2b87	179	pr_debug("%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	180	at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
e7a8bb12 AM	181	tm.tm_min, tm.tm_sec);
788b1fc6 AV	182
	183	return 0;
	184	}
	185
	186	/*
	187	* Handle commands from user-space
	188	*/
e7a8bb12 AM	189	static int at91_rtc_ioctl(struct device *dev, unsigned int cmd,
e7a8bb12 AM	190	unsigned long arg)
788b1fc6 AV	191	{
	192	int ret = 0;
	193
2a4e2b87	194	pr_debug("%s(): cmd=%08x, arg=%08lx.\n", __func__, cmd, arg);
788b1fc6	195
449321b3	196	/* important: scrub old status before enabling IRQs */
788b1fc6 AV	197	switch (cmd) {
	198	case RTC_AIE_OFF: /* alarm off */
	199	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
	200	break;
	201	case RTC_AIE_ON: /* alarm on */
449321b3	202	at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
788b1fc6 AV	203	at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
	204	break;
	205	case RTC_UIE_OFF: /* update off */
788b1fc6 AV	206	at91_sys_write(AT91_RTC_IDR, AT91_RTC_SECEV);
	207	break;
	208	case RTC_UIE_ON: /* update on */
449321b3	209	at91_sys_write(AT91_RTC_SCCR, AT91_RTC_SECEV);
788b1fc6 AV	210	at91_sys_write(AT91_RTC_IER, AT91_RTC_SECEV);
788b1fc6 AV	211	break;
788b1fc6 AV	212	default:
	213	ret = -ENOIOCTLCMD;
	214	break;
	215	}
	216
	217	return ret;
	218	}
	219
	220	/*
	221	* Provide additional RTC information in /proc/driver/rtc
	222	*/
	223	static int at91_rtc_proc(struct device dev, struct seq_file seq)
	224	{
	225	unsigned long imr = at91_sys_read(AT91_RTC_IMR);
	226
e7a8bb12 AM	227	seq_printf(seq, "update_IRQ\t: %s\n",
	228	(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
	229	seq_printf(seq, "periodic_IRQ\t: %s\n",
	230	(imr & AT91_RTC_SECEV) ? "yes" : "no");
	231	seq_printf(seq, "periodic_freq\t: %ld\n",
	232	(unsigned long) AT91_RTC_FREQ);
788b1fc6 AV	233
	234	return 0;
	235	}
	236
	237	/*
	238	* IRQ handler for the RTC
	239	*/
7d12e780	240	static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
788b1fc6	241	{
e7a8bb12	242	struct platform_device *pdev = dev_id;
788b1fc6 AV	243	struct rtc_device *rtc = platform_get_drvdata(pdev);
	244	unsigned int rtsr;
	245	unsigned long events = 0;
	246
	247	rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR);
	248	if (rtsr) { /* this interrupt is shared! Is it ours? */
	249	if (rtsr & AT91_RTC_ALARM)
	250	events \|= (RTC_AF \| RTC_IRQF);
	251	if (rtsr & AT91_RTC_SECEV)
	252	events \|= (RTC_UF \| RTC_IRQF);
	253	if (rtsr & AT91_RTC_ACKUPD)
	254	complete(&at91_rtc_updated);
	255
e7a8bb12	256	at91_sys_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
788b1fc6	257
ab6a2d70	258	rtc_update_irq(rtc, 1, events);
788b1fc6	259
2a4e2b87	260	pr_debug("%s(): num=%ld, events=0x%02lx\n", __func__,
788b1fc6 AV	261	events >> 8, events & 0x000000FF);
	262
	263	return IRQ_HANDLED;
	264	}
	265	return IRQ_NONE; /* not handled */
	266	}
	267
ff8371ac	268	static const struct rtc_class_ops at91_rtc_ops = {
788b1fc6 AV	269	.ioctl = at91_rtc_ioctl,
	270	.read_time = at91_rtc_readtime,
	271	.set_time = at91_rtc_settime,
	272	.read_alarm = at91_rtc_readalarm,
	273	.set_alarm = at91_rtc_setalarm,
	274	.proc = at91_rtc_proc,
	275	};
	276
	277	/*
	278	* Initialize and install RTC driver
	279	*/
	280	static int __init at91_rtc_probe(struct platform_device *pdev)
	281	{
	282	struct rtc_device *rtc;
	283	int ret;
	284
	285	at91_sys_write(AT91_RTC_CR, 0);
	286	at91_sys_write(AT91_RTC_MR, 0); /* 24 hour mode */
	287
	288	/* Disable all interrupts */
e7a8bb12 AM	289	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
	290	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
	291	AT91_RTC_CALEV);
788b1fc6	292
e7a8bb12	293	ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
d728b1e6 DB	294	IRQF_DISABLED \| IRQF_SHARED,
d728b1e6 DB	295	"at91_rtc", pdev);
788b1fc6	296	if (ret) {
e7a8bb12 AM	297	printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n",
e7a8bb12 AM	298	AT91_ID_SYS);
788b1fc6 AV	299	return ret;
	300	}
	301
5d4675a8 DB	302	/* cpu init code should really have flagged this device as
	303	* being wake-capable; if it didn't, do that here.
	304	*/
	305	if (!device_can_wakeup(&pdev->dev))
	306	device_init_wakeup(&pdev->dev, 1);
	307
e7a8bb12 AM	308	rtc = rtc_device_register(pdev->name, &pdev->dev,
e7a8bb12 AM	309	&at91_rtc_ops, THIS_MODULE);
788b1fc6 AV	310	if (IS_ERR(rtc)) {
	311	free_irq(AT91_ID_SYS, pdev);
	312	return PTR_ERR(rtc);
	313	}
	314	platform_set_drvdata(pdev, rtc);
	315
	316	printk(KERN_INFO "AT91 Real Time Clock driver.\n");
	317	return 0;
	318	}
	319
	320	/*
	321	* Disable and remove the RTC driver
	322	*/
5d4675a8	323	static int __exit at91_rtc_remove(struct platform_device *pdev)
788b1fc6 AV	324	{
	325	struct rtc_device *rtc = platform_get_drvdata(pdev);
	326
	327	/* Disable all interrupts */
e7a8bb12 AM	328	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
	329	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
	330	AT91_RTC_CALEV);
788b1fc6 AV	331	free_irq(AT91_ID_SYS, pdev);
	332
	333	rtc_device_unregister(rtc);
	334	platform_set_drvdata(pdev, NULL);
	335
	336	return 0;
	337	}
	338
	339	#ifdef CONFIG_PM
	340
	341	/* AT91RM9200 RTC Power management control */
	342
90b4d648	343	static u32 at91_rtc_imr;
788b1fc6 AV	344
	345	static int at91_rtc_suspend(struct platform_device *pdev, pm_message_t state)
	346	{
90b4d648 DB	347	/* this IRQ is shared with DBGU and other hardware which isn't
	348	* necessarily doing PM like we are...
	349	*/
	350	at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)
	351	& (AT91_RTC_ALARM\|AT91_RTC_SECEV);
	352	if (at91_rtc_imr) {
	353	if (device_may_wakeup(&pdev->dev))
	354	enable_irq_wake(AT91_ID_SYS);
	355	else
	356	at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);
	357	}
788b1fc6 AV	358	return 0;
	359	}
	360
	361	static int at91_rtc_resume(struct platform_device *pdev)
	362	{
90b4d648 DB	363	if (at91_rtc_imr) {
	364	if (device_may_wakeup(&pdev->dev))
	365	disable_irq_wake(AT91_ID_SYS);
	366	else
	367	at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
	368	}
788b1fc6 AV	369	return 0;
	370	}
	371	#else
	372	#define at91_rtc_suspend NULL
	373	#define at91_rtc_resume NULL
	374	#endif
	375
	376	static struct platform_driver at91_rtc_driver = {
5d4675a8	377	.remove = __exit_p(at91_rtc_remove),
788b1fc6 AV	378	.suspend = at91_rtc_suspend,
	379	.resume = at91_rtc_resume,
	380	.driver = {
	381	.name = "at91_rtc",
	382	.owner = THIS_MODULE,
	383	},
	384	};
	385
	386	static int __init at91_rtc_init(void)
	387	{
5d4675a8	388	return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe);
788b1fc6 AV	389	}
	390
	391	static void __exit at91_rtc_exit(void)
	392	{
	393	platform_driver_unregister(&at91_rtc_driver);
	394	}
	395
788b1fc6 AV	396	module_init(at91_rtc_init);
	397	module_exit(at91_rtc_exit);
	398
	399	MODULE_AUTHOR("Rick Bronson");
	400	MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
	401	MODULE_LICENSE("GPL");
ad28a07b	402	MODULE_ALIAS("platform:at91_rtc");