[mirror_ubuntu-zesty-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_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 will 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;
}

static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
	pr_debug("%s(): cmd=%08x\n", __func__, enabled);

	if (enabled) {
		at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
		at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
	} else
		at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);

	return 0;
}
/*
 * 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");

	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 = {
	.read_time	= at91_rtc_readtime,
	.set_time	= at91_rtc_settime,
	.read_alarm	= at91_rtc_readalarm,
	.set_alarm	= at91_rtc_setalarm,
	.proc		= at91_rtc_proc,
	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
};

/*
 * 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_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 device *dev)
{
	/* 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(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 device *dev)
{
	if (at91_rtc_imr) {
		if (device_may_wakeup(dev))
			disable_irq_wake(AT91_ID_SYS);
		else
			at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
	}
	return 0;
}

static const struct dev_pm_ops at91_rtc_pm = {
	.suspend =	at91_rtc_suspend,
	.resume =	at91_rtc_resume,
};

#define at91_rtc_pm_ptr	&at91_rtc_pm

#else
#define at91_rtc_pm_ptr	NULL
#endif

static struct platform_driver at91_rtc_driver = {
	.remove		= __exit_p(at91_rtc_remove),
	.driver		= {
		.name	= "at91_rtc",
		.owner	= THIS_MODULE,
		.pm	= at91_rtc_pm_ptr,
	},
};

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>
fb0d4ec4	32
a09e64fb	33	#include <mach/at91_rtc.h>
d73e3cd7	34
788b1fc6	35
788b1fc6 AV	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	55
fe20ba70 AB	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);
788b1fc6 AV	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
25985edc	63	* alarm is set, at91_alarm_year will store the current year.
788b1fc6	64	*/
fe20ba70 AB	65	tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */
fe20ba70 AB	66	tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */
788b1fc6	67
fe20ba70 AB	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);
788b1fc6 AV	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,
fe20ba70 AB	109	bin2bcd(tm->tm_sec) << 0
	110	\| bin2bcd(tm->tm_min) << 8
	111	\| bin2bcd(tm->tm_hour) << 16);
788b1fc6 AV	112
788b1fc6 AV	113	at91_sys_write(AT91_RTC_CALR,
fe20ba70 AB	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 */
	118	\| bin2bcd(tm->tm_mday) << 24);
788b1fc6 AV	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	164	at91_sys_write(AT91_RTC_TIMALR,
fe20ba70 AB	165	bin2bcd(tm.tm_sec) << 0
	166	\| bin2bcd(tm.tm_min) << 8
	167	\| bin2bcd(tm.tm_hour) << 16
788b1fc6 AV	168	\| AT91_RTC_HOUREN \| AT91_RTC_MINEN \| AT91_RTC_SECEN);
788b1fc6 AV	169	at91_sys_write(AT91_RTC_CALALR,
fe20ba70 AB	170	bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */
fe20ba70 AB	171	\| bin2bcd(tm.tm_mday) << 24
788b1fc6 AV	172	\| AT91_RTC_DATEEN \| AT91_RTC_MTHEN);
788b1fc6 AV	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
16380c15 JS	186	static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	187	{
	188	pr_debug("%s(): cmd=%08x\n", __func__, enabled);
	189
	190	if (enabled) {
	191	at91_sys_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
	192	at91_sys_write(AT91_RTC_IER, AT91_RTC_ALARM);
	193	} else
	194	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ALARM);
	195
	196	return 0;
	197	}
788b1fc6 AV	198	/*
	199	* Provide additional RTC information in /proc/driver/rtc
	200	*/
	201	static int at91_rtc_proc(struct device dev, struct seq_file seq)
	202	{
	203	unsigned long imr = at91_sys_read(AT91_RTC_IMR);
	204
e7a8bb12 AM	205	seq_printf(seq, "update_IRQ\t: %s\n",
	206	(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
	207	seq_printf(seq, "periodic_IRQ\t: %s\n",
	208	(imr & AT91_RTC_SECEV) ? "yes" : "no");
788b1fc6 AV	209
	210	return 0;
	211	}
	212
	213	/*
	214	* IRQ handler for the RTC
	215	*/
7d12e780	216	static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
788b1fc6	217	{
e7a8bb12	218	struct platform_device *pdev = dev_id;
788b1fc6 AV	219	struct rtc_device *rtc = platform_get_drvdata(pdev);
	220	unsigned int rtsr;
	221	unsigned long events = 0;
	222
	223	rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR);
	224	if (rtsr) { /* this interrupt is shared! Is it ours? */
	225	if (rtsr & AT91_RTC_ALARM)
	226	events \|= (RTC_AF \| RTC_IRQF);
	227	if (rtsr & AT91_RTC_SECEV)
	228	events \|= (RTC_UF \| RTC_IRQF);
	229	if (rtsr & AT91_RTC_ACKUPD)
	230	complete(&at91_rtc_updated);
	231
e7a8bb12	232	at91_sys_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
788b1fc6	233
ab6a2d70	234	rtc_update_irq(rtc, 1, events);
788b1fc6	235
2a4e2b87	236	pr_debug("%s(): num=%ld, events=0x%02lx\n", __func__,
788b1fc6 AV	237	events >> 8, events & 0x000000FF);
	238
	239	return IRQ_HANDLED;
	240	}
	241	return IRQ_NONE; /* not handled */
	242	}
	243
ff8371ac	244	static const struct rtc_class_ops at91_rtc_ops = {
788b1fc6 AV	245	.read_time = at91_rtc_readtime,
	246	.set_time = at91_rtc_settime,
	247	.read_alarm = at91_rtc_readalarm,
	248	.set_alarm = at91_rtc_setalarm,
	249	.proc = at91_rtc_proc,
16380c15	250	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
788b1fc6 AV	251	};
	252
	253	/*
	254	* Initialize and install RTC driver
	255	*/
	256	static int __init at91_rtc_probe(struct platform_device *pdev)
	257	{
	258	struct rtc_device *rtc;
	259	int ret;
	260
	261	at91_sys_write(AT91_RTC_CR, 0);
	262	at91_sys_write(AT91_RTC_MR, 0); /* 24 hour mode */
	263
	264	/* Disable all interrupts */
e7a8bb12 AM	265	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
	266	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
	267	AT91_RTC_CALEV);
788b1fc6	268
e7a8bb12	269	ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
dac94d9e	270	IRQF_SHARED,
d728b1e6	271	"at91_rtc", pdev);
788b1fc6	272	if (ret) {
e7a8bb12 AM	273	printk(KERN_ERR "at91_rtc: IRQ %d already in use.\n",
e7a8bb12 AM	274	AT91_ID_SYS);
788b1fc6 AV	275	return ret;
	276	}
	277
5d4675a8 DB	278	/* cpu init code should really have flagged this device as
	279	* being wake-capable; if it didn't, do that here.
	280	*/
	281	if (!device_can_wakeup(&pdev->dev))
	282	device_init_wakeup(&pdev->dev, 1);
	283
e7a8bb12 AM	284	rtc = rtc_device_register(pdev->name, &pdev->dev,
e7a8bb12 AM	285	&at91_rtc_ops, THIS_MODULE);
788b1fc6 AV	286	if (IS_ERR(rtc)) {
	287	free_irq(AT91_ID_SYS, pdev);
	288	return PTR_ERR(rtc);
	289	}
	290	platform_set_drvdata(pdev, rtc);
	291
	292	printk(KERN_INFO "AT91 Real Time Clock driver.\n");
	293	return 0;
	294	}
	295
	296	/*
	297	* Disable and remove the RTC driver
	298	*/
5d4675a8	299	static int __exit at91_rtc_remove(struct platform_device *pdev)
788b1fc6 AV	300	{
	301	struct rtc_device *rtc = platform_get_drvdata(pdev);
	302
	303	/* Disable all interrupts */
e7a8bb12 AM	304	at91_sys_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
	305	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
	306	AT91_RTC_CALEV);
788b1fc6 AV	307	free_irq(AT91_ID_SYS, pdev);
	308
	309	rtc_device_unregister(rtc);
	310	platform_set_drvdata(pdev, NULL);
	311
	312	return 0;
	313	}
	314
	315	#ifdef CONFIG_PM
	316
	317	/* AT91RM9200 RTC Power management control */
	318
90b4d648	319	static u32 at91_rtc_imr;
788b1fc6	320
dac94d9e	321	static int at91_rtc_suspend(struct device *dev)
788b1fc6	322	{
90b4d648 DB	323	/* this IRQ is shared with DBGU and other hardware which isn't
	324	* necessarily doing PM like we are...
	325	*/
	326	at91_rtc_imr = at91_sys_read(AT91_RTC_IMR)
	327	& (AT91_RTC_ALARM\|AT91_RTC_SECEV);
	328	if (at91_rtc_imr) {
dac94d9e	329	if (device_may_wakeup(dev))
90b4d648 DB	330	enable_irq_wake(AT91_ID_SYS);
	331	else
	332	at91_sys_write(AT91_RTC_IDR, at91_rtc_imr);
	333	}
788b1fc6 AV	334	return 0;
	335	}
	336
dac94d9e	337	static int at91_rtc_resume(struct device *dev)
788b1fc6	338	{
90b4d648	339	if (at91_rtc_imr) {
dac94d9e	340	if (device_may_wakeup(dev))
90b4d648 DB	341	disable_irq_wake(AT91_ID_SYS);
	342	else
	343	at91_sys_write(AT91_RTC_IER, at91_rtc_imr);
	344	}
788b1fc6 AV	345	return 0;
788b1fc6 AV	346	}
dac94d9e DB	347
	348	static const struct dev_pm_ops at91_rtc_pm = {
	349	.suspend = at91_rtc_suspend,
	350	.resume = at91_rtc_resume,
	351	};
	352
	353	#define at91_rtc_pm_ptr &at91_rtc_pm
	354
788b1fc6	355	#else
dac94d9e	356	#define at91_rtc_pm_ptr NULL
788b1fc6 AV	357	#endif
	358
	359	static struct platform_driver at91_rtc_driver = {
5d4675a8	360	.remove = __exit_p(at91_rtc_remove),
788b1fc6 AV	361	.driver = {
	362	.name = "at91_rtc",
	363	.owner = THIS_MODULE,
dac94d9e	364	.pm = at91_rtc_pm_ptr,
788b1fc6 AV	365	},
	366	};
	367
	368	static int __init at91_rtc_init(void)
	369	{
5d4675a8	370	return platform_driver_probe(&at91_rtc_driver, at91_rtc_probe);
788b1fc6 AV	371	}
	372
	373	static void __exit at91_rtc_exit(void)
	374	{
	375	platform_driver_unregister(&at91_rtc_driver);
	376	}
	377
788b1fc6 AV	378	module_init(at91_rtc_init);
	379	module_exit(at91_rtc_exit);
	380
	381	MODULE_AUTHOR("Rick Bronson");
	382	MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
	383	MODULE_LICENSE("GPL");
ad28a07b	384	MODULE_ALIAS("platform:at91_rtc");