[deliverable/linux.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 <linux/io.h>

#include <asm/uaccess.h>

#include "rtc-at91rm9200.h"

#define at91_rtc_read(field) \
	__raw_readl(at91_rtc_regs + field)
#define at91_rtc_write(field, val) \
	__raw_writel((val), at91_rtc_regs + field)

#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;
static void __iomem *at91_rtc_regs;
static int irq;

/*
 * 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_rtc_read(timereg);
		date = at91_rtc_read(calreg);
	} while ((time != at91_rtc_read(timereg)) ||
			(date != at91_rtc_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;

	dev_dbg(dev, "%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;

	dev_dbg(dev, "%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_rtc_read(AT91_RTC_CR);
	at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);

	at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
	wait_for_completion(&at91_rtc_updated);	/* wait for ACKUPD interrupt */
	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);

	at91_rtc_write(AT91_RTC_TIMR,
			  bin2bcd(tm->tm_sec) << 0
			| bin2bcd(tm->tm_min) << 8
			| bin2bcd(tm->tm_hour) << 16);

	at91_rtc_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_rtc_read(AT91_RTC_CR);
	at91_rtc_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_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
			? 1 : 0;

	dev_dbg(dev, "%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_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
	at91_rtc_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_rtc_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_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
		at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
	}

	dev_dbg(dev, "%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)
{
	dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled);

	if (enabled) {
		at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
		at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
	} else
		at91_rtc_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_rtc_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_rtc_read(AT91_RTC_SR) & at91_rtc_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_rtc_write(AT91_RTC_SCCR, rtsr);	/* clear status reg */

		rtc_update_irq(rtc, 1, events);

		dev_dbg(&pdev->dev, "%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;
	struct resource *regs;
	int ret = 0;

	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!regs) {
		dev_err(&pdev->dev, "no mmio resource defined\n");
		return -ENXIO;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "no irq resource defined\n");
		return -ENXIO;
	}

	at91_rtc_regs = ioremap(regs->start, resource_size(regs));
	if (!at91_rtc_regs) {
		dev_err(&pdev->dev, "failed to map registers, aborting.\n");
		return -ENOMEM;
	}

	at91_rtc_write(AT91_RTC_CR, 0);
	at91_rtc_write(AT91_RTC_MR, 0);		/* 24 hour mode */

	/* Disable all interrupts */
	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
					AT91_RTC_SECEV | AT91_RTC_TIMEV |
					AT91_RTC_CALEV);

	ret = request_irq(irq, at91_rtc_interrupt,
				IRQF_SHARED,
				"at91_rtc", pdev);
	if (ret) {
		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
		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(irq, pdev);
		return PTR_ERR(rtc);
	}
	platform_set_drvdata(pdev, rtc);

	dev_info(&pdev->dev, "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_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
					AT91_RTC_SECEV | AT91_RTC_TIMEV |
					AT91_RTC_CALEV);
	free_irq(irq, pdev);

	rtc_device_unregister(rtc);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

#ifdef CONFIG_PM_SLEEP

/* 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_rtc_read(AT91_RTC_IMR)
			& (AT91_RTC_ALARM|AT91_RTC_SECEV);
	if (at91_rtc_imr) {
		if (device_may_wakeup(dev))
			enable_irq_wake(irq);
		else
			at91_rtc_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(irq);
		else
			at91_rtc_write(AT91_RTC_IER, at91_rtc_imr);
	}
	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);

static struct platform_driver at91_rtc_driver = {
	.remove		= __exit_p(at91_rtc_remove),
	.driver		= {
		.name	= "at91_rtc",
		.owner	= THIS_MODULE,
		.pm	= &at91_rtc_pm_ops,
	},
};

module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe);

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>
14070ade	30	#include <linux/io.h>
788b1fc6 AV	31
788b1fc6 AV	32	#include <asm/uaccess.h>
fb0d4ec4	33
75984df0	34	#include "rtc-at91rm9200.h"
d73e3cd7	35
d28bdfc5 JCPV	36	#define at91_rtc_read(field) \
	37	__raw_readl(at91_rtc_regs + field)
	38	#define at91_rtc_write(field, val) \
	39	__raw_writel((val), at91_rtc_regs + field)
788b1fc6	40
788b1fc6 AV	41	#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */
	42
	43	static DECLARE_COMPLETION(at91_rtc_updated);
	44	static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
d28bdfc5 JCPV	45	static void __iomem *at91_rtc_regs;
d28bdfc5 JCPV	46	static int irq;
788b1fc6	47
788b1fc6 AV	48	/*
	49	* Decode time/date into rtc_time structure
	50	*/
e7a8bb12 AM	51	static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
e7a8bb12 AM	52	struct rtc_time *tm)
788b1fc6 AV	53	{
	54	unsigned int time, date;
	55
	56	/* must read twice in case it changes */
	57	do {
d28bdfc5 JCPV	58	time = at91_rtc_read(timereg);
	59	date = at91_rtc_read(calreg);
	60	} while ((time != at91_rtc_read(timereg)) \|\|
	61	(date != at91_rtc_read(calreg)));
788b1fc6	62
fe20ba70 AB	63	tm->tm_sec = bcd2bin((time & AT91_RTC_SEC) >> 0);
	64	tm->tm_min = bcd2bin((time & AT91_RTC_MIN) >> 8);
	65	tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16);
788b1fc6 AV	66
	67	/*
	68	* The Calendar Alarm register does not have a field for
	69	* the year - so these will return an invalid value. When an
25985edc	70	* alarm is set, at91_alarm_year will store the current year.
788b1fc6	71	*/
fe20ba70 AB	72	tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */
fe20ba70 AB	73	tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */
788b1fc6	74
fe20ba70 AB	75	tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */
	76	tm->tm_mon = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1;
	77	tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24);
788b1fc6 AV	78	}
	79
	80	/*
	81	* Read current time and date in RTC
	82	*/
	83	static int at91_rtc_readtime(struct device dev, struct rtc_time tm)
	84	{
	85	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
	86	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	87	tm->tm_year = tm->tm_year - 1900;
	88
6588208c	89	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	90	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	91	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	92
	93	return 0;
	94	}
	95
	96	/*
	97	* Set current time and date in RTC
	98	*/
	99	static int at91_rtc_settime(struct device dev, struct rtc_time tm)
	100	{
	101	unsigned long cr;
	102
6588208c	103	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	104	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	105	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	106
788b1fc6 AV	107	/* Stop Time/Calendar from counting */
d28bdfc5 JCPV	108	cr = at91_rtc_read(AT91_RTC_CR);
d28bdfc5 JCPV	109	at91_rtc_write(AT91_RTC_CR, cr \| AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM);
788b1fc6	110
d28bdfc5	111	at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
e7a8bb12	112	wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
d28bdfc5	113	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
788b1fc6	114
d28bdfc5	115	at91_rtc_write(AT91_RTC_TIMR,
fe20ba70 AB	116	bin2bcd(tm->tm_sec) << 0
	117	\| bin2bcd(tm->tm_min) << 8
	118	\| bin2bcd(tm->tm_hour) << 16);
788b1fc6	119
d28bdfc5	120	at91_rtc_write(AT91_RTC_CALR,
fe20ba70 AB	121	bin2bcd((tm->tm_year + 1900) / 100) /* century */
	122	\| bin2bcd(tm->tm_year % 100) << 8 /* year */
	123	\| bin2bcd(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */
	124	\| bin2bcd(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */
	125	\| bin2bcd(tm->tm_mday) << 24);
788b1fc6 AV	126
788b1fc6 AV	127	/* Restart Time/Calendar */
d28bdfc5 JCPV	128	cr = at91_rtc_read(AT91_RTC_CR);
d28bdfc5 JCPV	129	at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM));
788b1fc6 AV	130
	131	return 0;
	132	}
	133
	134	/*
	135	* Read alarm time and date in RTC
	136	*/
	137	static int at91_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	138	{
	139	struct rtc_time *tm = &alrm->time;
	140
	141	at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
	142	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	143	tm->tm_year = at91_alarm_year - 1900;
	144
e24b0bfa	145	alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
a2db8dfc DB	146	? 1 : 0;
a2db8dfc DB	147
6588208c	148	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	149	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	150	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	151
	152	return 0;
	153	}
	154
	155	/*
	156	* Set alarm time and date in RTC
	157	*/
	158	static int at91_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	159	{
	160	struct rtc_time tm;
	161
	162	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
	163
	164	at91_alarm_year = tm.tm_year;
	165
	166	tm.tm_hour = alrm->time.tm_hour;
	167	tm.tm_min = alrm->time.tm_min;
	168	tm.tm_sec = alrm->time.tm_sec;
	169
d28bdfc5 JCPV	170	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
d28bdfc5 JCPV	171	at91_rtc_write(AT91_RTC_TIMALR,
fe20ba70 AB	172	bin2bcd(tm.tm_sec) << 0
	173	\| bin2bcd(tm.tm_min) << 8
	174	\| bin2bcd(tm.tm_hour) << 16
788b1fc6	175	\| AT91_RTC_HOUREN \| AT91_RTC_MINEN \| AT91_RTC_SECEN);
d28bdfc5	176	at91_rtc_write(AT91_RTC_CALALR,
fe20ba70 AB	177	bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */
fe20ba70 AB	178	\| bin2bcd(tm.tm_mday) << 24
788b1fc6 AV	179	\| AT91_RTC_DATEEN \| AT91_RTC_MTHEN);
788b1fc6 AV	180
449321b3	181	if (alrm->enabled) {
d28bdfc5 JCPV	182	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
d28bdfc5 JCPV	183	at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
449321b3	184	}
5d4675a8	185
6588208c	186	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	187	at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
e7a8bb12 AM	188	tm.tm_min, tm.tm_sec);
788b1fc6 AV	189
	190	return 0;
	191	}
	192
16380c15 JS	193	static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
16380c15 JS	194	{
6588208c	195	dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled);
16380c15 JS	196
16380c15 JS	197	if (enabled) {
d28bdfc5 JCPV	198	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
d28bdfc5 JCPV	199	at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
e24b0bfa	200	} else
d28bdfc5	201	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
16380c15 JS	202
	203	return 0;
	204	}
788b1fc6 AV	205	/*
	206	* Provide additional RTC information in /proc/driver/rtc
	207	*/
	208	static int at91_rtc_proc(struct device dev, struct seq_file seq)
	209	{
e24b0bfa JH	210	unsigned long imr = at91_rtc_read(AT91_RTC_IMR);
e24b0bfa JH	211
e7a8bb12	212	seq_printf(seq, "update_IRQ\t: %s\n",
e24b0bfa	213	(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
e7a8bb12	214	seq_printf(seq, "periodic_IRQ\t: %s\n",
e24b0bfa	215	(imr & AT91_RTC_SECEV) ? "yes" : "no");
788b1fc6 AV	216
	217	return 0;
	218	}
	219
	220	/*
	221	* IRQ handler for the RTC
	222	*/
7d12e780	223	static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
788b1fc6	224	{
e7a8bb12	225	struct platform_device *pdev = dev_id;
788b1fc6 AV	226	struct rtc_device *rtc = platform_get_drvdata(pdev);
	227	unsigned int rtsr;
	228	unsigned long events = 0;
	229
e24b0bfa	230	rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR);
788b1fc6 AV	231	if (rtsr) { /* this interrupt is shared! Is it ours? */
	232	if (rtsr & AT91_RTC_ALARM)
	233	events \|= (RTC_AF \| RTC_IRQF);
	234	if (rtsr & AT91_RTC_SECEV)
	235	events \|= (RTC_UF \| RTC_IRQF);
	236	if (rtsr & AT91_RTC_ACKUPD)
	237	complete(&at91_rtc_updated);
	238
d28bdfc5	239	at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
788b1fc6	240
ab6a2d70	241	rtc_update_irq(rtc, 1, events);
788b1fc6	242
6588208c	243	dev_dbg(&pdev->dev, "%s(): num=%ld, events=0x%02lx\n", __func__,
788b1fc6 AV	244	events >> 8, events & 0x000000FF);
	245
	246	return IRQ_HANDLED;
	247	}
	248	return IRQ_NONE; /* not handled */
	249	}
	250
ff8371ac	251	static const struct rtc_class_ops at91_rtc_ops = {
788b1fc6 AV	252	.read_time = at91_rtc_readtime,
	253	.set_time = at91_rtc_settime,
	254	.read_alarm = at91_rtc_readalarm,
	255	.set_alarm = at91_rtc_setalarm,
	256	.proc = at91_rtc_proc,
16380c15	257	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
788b1fc6 AV	258	};
	259
	260	/*
	261	* Initialize and install RTC driver
	262	*/
	263	static int __init at91_rtc_probe(struct platform_device *pdev)
	264	{
	265	struct rtc_device *rtc;
d28bdfc5 JCPV	266	struct resource *regs;
d28bdfc5 JCPV	267	int ret = 0;
788b1fc6	268
d28bdfc5 JCPV	269	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	270	if (!regs) {
	271	dev_err(&pdev->dev, "no mmio resource defined\n");
	272	return -ENXIO;
	273	}
	274
	275	irq = platform_get_irq(pdev, 0);
	276	if (irq < 0) {
	277	dev_err(&pdev->dev, "no irq resource defined\n");
	278	return -ENXIO;
	279	}
	280
	281	at91_rtc_regs = ioremap(regs->start, resource_size(regs));
	282	if (!at91_rtc_regs) {
	283	dev_err(&pdev->dev, "failed to map registers, aborting.\n");
	284	return -ENOMEM;
	285	}
	286
	287	at91_rtc_write(AT91_RTC_CR, 0);
	288	at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */
788b1fc6 AV	289
788b1fc6 AV	290	/* Disable all interrupts */
d28bdfc5	291	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
e7a8bb12 AM	292	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
e7a8bb12 AM	293	AT91_RTC_CALEV);
788b1fc6	294
d28bdfc5	295	ret = request_irq(irq, at91_rtc_interrupt,
dac94d9e	296	IRQF_SHARED,
d728b1e6	297	"at91_rtc", pdev);
788b1fc6	298	if (ret) {
6588208c	299	dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
788b1fc6 AV	300	return ret;
	301	}
	302
5d4675a8 DB	303	/* cpu init code should really have flagged this device as
	304	* being wake-capable; if it didn't, do that here.
	305	*/
	306	if (!device_can_wakeup(&pdev->dev))
	307	device_init_wakeup(&pdev->dev, 1);
	308
e7a8bb12 AM	309	rtc = rtc_device_register(pdev->name, &pdev->dev,
e7a8bb12 AM	310	&at91_rtc_ops, THIS_MODULE);
788b1fc6	311	if (IS_ERR(rtc)) {
d28bdfc5	312	free_irq(irq, pdev);
788b1fc6 AV	313	return PTR_ERR(rtc);
	314	}
	315	platform_set_drvdata(pdev, rtc);
	316
6588208c	317	dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
788b1fc6 AV	318	return 0;
	319	}
	320
	321	/*
	322	* Disable and remove the RTC driver
	323	*/
5d4675a8	324	static int __exit at91_rtc_remove(struct platform_device *pdev)
788b1fc6 AV	325	{
	326	struct rtc_device *rtc = platform_get_drvdata(pdev);
	327
	328	/* Disable all interrupts */
d28bdfc5	329	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
e7a8bb12 AM	330	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
e7a8bb12 AM	331	AT91_RTC_CALEV);
d28bdfc5	332	free_irq(irq, pdev);
788b1fc6 AV	333
	334	rtc_device_unregister(rtc);
	335	platform_set_drvdata(pdev, NULL);
	336
	337	return 0;
	338	}
	339
6975a9c1	340	#ifdef CONFIG_PM_SLEEP
788b1fc6 AV	341
	342	/* AT91RM9200 RTC Power management control */
	343
e24b0bfa	344	static u32 at91_rtc_imr;
788b1fc6	345
dac94d9e	346	static int at91_rtc_suspend(struct device *dev)
788b1fc6	347	{
90b4d648 DB	348	/* this IRQ is shared with DBGU and other hardware which isn't
	349	* necessarily doing PM like we are...
	350	*/
e24b0bfa JH	351	at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR)
	352	& (AT91_RTC_ALARM\|AT91_RTC_SECEV);
	353	if (at91_rtc_imr) {
	354	if (device_may_wakeup(dev))
d28bdfc5	355	enable_irq_wake(irq);
e24b0bfa JH	356	else
	357	at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr);
	358	}
788b1fc6 AV	359	return 0;
	360	}
	361
dac94d9e	362	static int at91_rtc_resume(struct device *dev)
788b1fc6	363	{
e24b0bfa JH	364	if (at91_rtc_imr) {
e24b0bfa JH	365	if (device_may_wakeup(dev))
d28bdfc5	366	disable_irq_wake(irq);
e24b0bfa JH	367	else
e24b0bfa JH	368	at91_rtc_write(AT91_RTC_IER, at91_rtc_imr);
90b4d648	369	}
788b1fc6 AV	370	return 0;
788b1fc6 AV	371	}
788b1fc6 AV	372	#endif
788b1fc6 AV	373
6975a9c1 JH	374	static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
6975a9c1 JH	375
788b1fc6	376	static struct platform_driver at91_rtc_driver = {
5d4675a8	377	.remove = __exit_p(at91_rtc_remove),
788b1fc6 AV	378	.driver = {
	379	.name = "at91_rtc",
	380	.owner = THIS_MODULE,
6975a9c1	381	.pm = &at91_rtc_pm_ops,
788b1fc6 AV	382	},
	383	};
	384
ac36960f	385	module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe);
788b1fc6 AV	386
	387	MODULE_AUTHOR("Rick Bronson");
	388	MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
	389	MODULE_LICENSE("GPL");
ad28a07b	390	MODULE_ALIAS("platform:at91_rtc");