[mirror_ubuntu-eoan-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 <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.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 */

struct at91_rtc_config {
};

static const struct at91_rtc_config *at91_rtc_config;
static DECLARE_COMPLETION(at91_rtc_updated);
static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
static void __iomem *at91_rtc_regs;
static int irq;

static void at91_rtc_write_ier(u32 mask)
{
	at91_rtc_write(AT91_RTC_IER, mask);
}

static void at91_rtc_write_idr(u32 mask)
{
	at91_rtc_write(AT91_RTC_IDR, mask);
}

static u32 at91_rtc_read_imr(void)
{
	return at91_rtc_read(AT91_RTC_IMR);
}

/*
 * 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_ier(AT91_RTC_ACKUPD);
	wait_for_completion(&at91_rtc_updated);	/* wait for ACKUPD interrupt */
	at91_rtc_write_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_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_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_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_ier(AT91_RTC_ALARM);
	} else
		at91_rtc_write_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_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_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 at91_rtc_config at91rm9200_config = {
};

#ifdef CONFIG_OF
static const struct of_device_id at91_rtc_dt_ids[] = {
	{
		.compatible = "atmel,at91rm9200-rtc",
		.data = &at91rm9200_config,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
#endif

static const struct at91_rtc_config *
at91_rtc_get_config(struct platform_device *pdev)
{
	const struct of_device_id *match;

	if (pdev->dev.of_node) {
		match = of_match_node(at91_rtc_dt_ids, pdev->dev.of_node);
		if (!match)
			return NULL;
		return (const struct at91_rtc_config *)match->data;
	}

	return &at91rm9200_config;
}

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;

	at91_rtc_config = at91_rtc_get_config(pdev);
	if (!at91_rtc_config)
		return -ENODEV;

	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_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);
		goto err_unmap;
	}

	/* 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)) {
		ret = PTR_ERR(rtc);
		goto err_free_irq;
	}
	platform_set_drvdata(pdev, rtc);

	dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
	return 0;

err_free_irq:
	free_irq(irq, pdev);
err_unmap:
	iounmap(at91_rtc_regs);

	return ret;
}

/*
 * 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_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
					AT91_RTC_SECEV | AT91_RTC_TIMEV |
					AT91_RTC_CALEV);
	free_irq(irq, pdev);

	rtc_device_unregister(rtc);
	iounmap(at91_rtc_regs);
	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_imr()
			& (AT91_RTC_ALARM|AT91_RTC_SECEV);
	if (at91_rtc_imr) {
		if (device_may_wakeup(dev))
			enable_irq_wake(irq);
		else
			at91_rtc_write_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_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,
		.of_match_table = of_match_ptr(at91_rtc_dt_ids),
	},
};

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>
7c1b68d4 JE	31	#include <linux/of.h>
7c1b68d4 JE	32	#include <linux/of_device.h>
788b1fc6 AV	33
788b1fc6 AV	34	#include <asm/uaccess.h>
fb0d4ec4	35
75984df0	36	#include "rtc-at91rm9200.h"
d73e3cd7	37
d28bdfc5 JCPV	38	#define at91_rtc_read(field) \
	39	__raw_readl(at91_rtc_regs + field)
	40	#define at91_rtc_write(field, val) \
	41	__raw_writel((val), at91_rtc_regs + field)
788b1fc6	42
788b1fc6 AV	43	#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */
788b1fc6 AV	44
de645475 JH	45	struct at91_rtc_config {
	46	};
	47
	48	static const struct at91_rtc_config *at91_rtc_config;
788b1fc6 AV	49	static DECLARE_COMPLETION(at91_rtc_updated);
788b1fc6 AV	50	static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
d28bdfc5 JCPV	51	static void __iomem *at91_rtc_regs;
d28bdfc5 JCPV	52	static int irq;
788b1fc6	53
e304fcd0 JH	54	static void at91_rtc_write_ier(u32 mask)
	55	{
	56	at91_rtc_write(AT91_RTC_IER, mask);
	57	}
	58
	59	static void at91_rtc_write_idr(u32 mask)
	60	{
	61	at91_rtc_write(AT91_RTC_IDR, mask);
	62	}
	63
	64	static u32 at91_rtc_read_imr(void)
	65	{
	66	return at91_rtc_read(AT91_RTC_IMR);
	67	}
	68
788b1fc6 AV	69	/*
	70	* Decode time/date into rtc_time structure
	71	*/
e7a8bb12 AM	72	static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
e7a8bb12 AM	73	struct rtc_time *tm)
788b1fc6 AV	74	{
	75	unsigned int time, date;
	76
	77	/* must read twice in case it changes */
	78	do {
d28bdfc5 JCPV	79	time = at91_rtc_read(timereg);
	80	date = at91_rtc_read(calreg);
	81	} while ((time != at91_rtc_read(timereg)) \|\|
	82	(date != at91_rtc_read(calreg)));
788b1fc6	83
fe20ba70 AB	84	tm->tm_sec = bcd2bin((time & AT91_RTC_SEC) >> 0);
	85	tm->tm_min = bcd2bin((time & AT91_RTC_MIN) >> 8);
	86	tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16);
788b1fc6 AV	87
	88	/*
	89	* The Calendar Alarm register does not have a field for
	90	* the year - so these will return an invalid value. When an
25985edc	91	* alarm is set, at91_alarm_year will store the current year.
788b1fc6	92	*/
fe20ba70 AB	93	tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */
fe20ba70 AB	94	tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */
788b1fc6	95
fe20ba70 AB	96	tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */
	97	tm->tm_mon = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1;
	98	tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24);
788b1fc6 AV	99	}
	100
	101	/*
	102	* Read current time and date in RTC
	103	*/
	104	static int at91_rtc_readtime(struct device dev, struct rtc_time tm)
	105	{
	106	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
	107	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	108	tm->tm_year = tm->tm_year - 1900;
	109
6588208c	110	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	111	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	112	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	113
	114	return 0;
	115	}
	116
	117	/*
	118	* Set current time and date in RTC
	119	*/
	120	static int at91_rtc_settime(struct device dev, struct rtc_time tm)
	121	{
	122	unsigned long cr;
	123
6588208c	124	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	125	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	126	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	127
788b1fc6 AV	128	/* Stop Time/Calendar from counting */
d28bdfc5 JCPV	129	cr = at91_rtc_read(AT91_RTC_CR);
d28bdfc5 JCPV	130	at91_rtc_write(AT91_RTC_CR, cr \| AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM);
788b1fc6	131
e304fcd0	132	at91_rtc_write_ier(AT91_RTC_ACKUPD);
e7a8bb12	133	wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
e304fcd0	134	at91_rtc_write_idr(AT91_RTC_ACKUPD);
788b1fc6	135
d28bdfc5	136	at91_rtc_write(AT91_RTC_TIMR,
fe20ba70 AB	137	bin2bcd(tm->tm_sec) << 0
	138	\| bin2bcd(tm->tm_min) << 8
	139	\| bin2bcd(tm->tm_hour) << 16);
788b1fc6	140
d28bdfc5	141	at91_rtc_write(AT91_RTC_CALR,
fe20ba70 AB	142	bin2bcd((tm->tm_year + 1900) / 100) /* century */
	143	\| bin2bcd(tm->tm_year % 100) << 8 /* year */
	144	\| bin2bcd(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */
	145	\| bin2bcd(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */
	146	\| bin2bcd(tm->tm_mday) << 24);
788b1fc6 AV	147
788b1fc6 AV	148	/* Restart Time/Calendar */
d28bdfc5 JCPV	149	cr = at91_rtc_read(AT91_RTC_CR);
d28bdfc5 JCPV	150	at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM));
788b1fc6 AV	151
	152	return 0;
	153	}
	154
	155	/*
	156	* Read alarm time and date in RTC
	157	*/
	158	static int at91_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	159	{
	160	struct rtc_time *tm = &alrm->time;
	161
	162	at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
	163	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	164	tm->tm_year = at91_alarm_year - 1900;
	165
e304fcd0	166	alrm->enabled = (at91_rtc_read_imr() & AT91_RTC_ALARM)
a2db8dfc DB	167	? 1 : 0;
a2db8dfc DB	168
6588208c	169	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	170	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	171	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	172
	173	return 0;
	174	}
	175
	176	/*
	177	* Set alarm time and date in RTC
	178	*/
	179	static int at91_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	180	{
	181	struct rtc_time tm;
	182
	183	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
	184
	185	at91_alarm_year = tm.tm_year;
	186
	187	tm.tm_hour = alrm->time.tm_hour;
	188	tm.tm_min = alrm->time.tm_min;
	189	tm.tm_sec = alrm->time.tm_sec;
	190
e304fcd0	191	at91_rtc_write_idr(AT91_RTC_ALARM);
d28bdfc5	192	at91_rtc_write(AT91_RTC_TIMALR,
fe20ba70 AB	193	bin2bcd(tm.tm_sec) << 0
	194	\| bin2bcd(tm.tm_min) << 8
	195	\| bin2bcd(tm.tm_hour) << 16
788b1fc6	196	\| AT91_RTC_HOUREN \| AT91_RTC_MINEN \| AT91_RTC_SECEN);
d28bdfc5	197	at91_rtc_write(AT91_RTC_CALALR,
fe20ba70 AB	198	bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */
fe20ba70 AB	199	\| bin2bcd(tm.tm_mday) << 24
788b1fc6 AV	200	\| AT91_RTC_DATEEN \| AT91_RTC_MTHEN);
788b1fc6 AV	201
449321b3	202	if (alrm->enabled) {
d28bdfc5	203	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
e304fcd0	204	at91_rtc_write_ier(AT91_RTC_ALARM);
449321b3	205	}
5d4675a8	206
6588208c	207	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	208	at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
e7a8bb12 AM	209	tm.tm_min, tm.tm_sec);
788b1fc6 AV	210
	211	return 0;
	212	}
	213
16380c15 JS	214	static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
16380c15 JS	215	{
6588208c	216	dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled);
16380c15 JS	217
16380c15 JS	218	if (enabled) {
d28bdfc5	219	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
e304fcd0	220	at91_rtc_write_ier(AT91_RTC_ALARM);
e24b0bfa	221	} else
e304fcd0	222	at91_rtc_write_idr(AT91_RTC_ALARM);
16380c15 JS	223
	224	return 0;
	225	}
788b1fc6 AV	226	/*
	227	* Provide additional RTC information in /proc/driver/rtc
	228	*/
	229	static int at91_rtc_proc(struct device dev, struct seq_file seq)
	230	{
e304fcd0	231	unsigned long imr = at91_rtc_read_imr();
e24b0bfa	232
e7a8bb12	233	seq_printf(seq, "update_IRQ\t: %s\n",
e24b0bfa	234	(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
e7a8bb12	235	seq_printf(seq, "periodic_IRQ\t: %s\n",
e24b0bfa	236	(imr & AT91_RTC_SECEV) ? "yes" : "no");
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
e304fcd0	251	rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read_imr();
788b1fc6 AV	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
d28bdfc5	260	at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
788b1fc6	261
ab6a2d70	262	rtc_update_irq(rtc, 1, events);
788b1fc6	263
6588208c	264	dev_dbg(&pdev->dev, "%s(): num=%ld, events=0x%02lx\n", __func__,
788b1fc6 AV	265	events >> 8, events & 0x000000FF);
	266
	267	return IRQ_HANDLED;
	268	}
	269	return IRQ_NONE; /* not handled */
	270	}
	271
de645475 JH	272	static const struct at91_rtc_config at91rm9200_config = {
	273	};
	274
	275	#ifdef CONFIG_OF
	276	static const struct of_device_id at91_rtc_dt_ids[] = {
	277	{
	278	.compatible = "atmel,at91rm9200-rtc",
	279	.data = &at91rm9200_config,
	280	}, {
	281	/* sentinel */
	282	}
	283	};
	284	MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
	285	#endif
	286
	287	static const struct at91_rtc_config *
	288	at91_rtc_get_config(struct platform_device *pdev)
	289	{
	290	const struct of_device_id *match;
	291
	292	if (pdev->dev.of_node) {
	293	match = of_match_node(at91_rtc_dt_ids, pdev->dev.of_node);
	294	if (!match)
	295	return NULL;
	296	return (const struct at91_rtc_config *)match->data;
	297	}
	298
	299	return &at91rm9200_config;
	300	}
	301
ff8371ac	302	static const struct rtc_class_ops at91_rtc_ops = {
788b1fc6 AV	303	.read_time = at91_rtc_readtime,
	304	.set_time = at91_rtc_settime,
	305	.read_alarm = at91_rtc_readalarm,
	306	.set_alarm = at91_rtc_setalarm,
	307	.proc = at91_rtc_proc,
16380c15	308	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
788b1fc6 AV	309	};
	310
	311	/*
	312	* Initialize and install RTC driver
	313	*/
	314	static int __init at91_rtc_probe(struct platform_device *pdev)
	315	{
	316	struct rtc_device *rtc;
d28bdfc5 JCPV	317	struct resource *regs;
d28bdfc5 JCPV	318	int ret = 0;
788b1fc6	319
de645475 JH	320	at91_rtc_config = at91_rtc_get_config(pdev);
	321	if (!at91_rtc_config)
	322	return -ENODEV;
	323
d28bdfc5 JCPV	324	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	325	if (!regs) {
	326	dev_err(&pdev->dev, "no mmio resource defined\n");
	327	return -ENXIO;
	328	}
	329
	330	irq = platform_get_irq(pdev, 0);
	331	if (irq < 0) {
	332	dev_err(&pdev->dev, "no irq resource defined\n");
	333	return -ENXIO;
	334	}
	335
	336	at91_rtc_regs = ioremap(regs->start, resource_size(regs));
	337	if (!at91_rtc_regs) {
	338	dev_err(&pdev->dev, "failed to map registers, aborting.\n");
	339	return -ENOMEM;
	340	}
	341
	342	at91_rtc_write(AT91_RTC_CR, 0);
	343	at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */
788b1fc6 AV	344
788b1fc6 AV	345	/* Disable all interrupts */
e304fcd0	346	at91_rtc_write_idr(AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
e7a8bb12 AM	347	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
e7a8bb12 AM	348	AT91_RTC_CALEV);
788b1fc6	349
d28bdfc5	350	ret = request_irq(irq, at91_rtc_interrupt,
dac94d9e	351	IRQF_SHARED,
d728b1e6	352	"at91_rtc", pdev);
788b1fc6	353	if (ret) {
6588208c	354	dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
3427de92	355	goto err_unmap;
788b1fc6 AV	356	}
788b1fc6 AV	357
5d4675a8 DB	358	/* cpu init code should really have flagged this device as
	359	* being wake-capable; if it didn't, do that here.
	360	*/
	361	if (!device_can_wakeup(&pdev->dev))
	362	device_init_wakeup(&pdev->dev, 1);
	363
e7a8bb12 AM	364	rtc = rtc_device_register(pdev->name, &pdev->dev,
e7a8bb12 AM	365	&at91_rtc_ops, THIS_MODULE);
788b1fc6	366	if (IS_ERR(rtc)) {
3427de92 JH	367	ret = PTR_ERR(rtc);
3427de92 JH	368	goto err_free_irq;
788b1fc6 AV	369	}
	370	platform_set_drvdata(pdev, rtc);
	371
6588208c	372	dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
788b1fc6	373	return 0;
3427de92 JH	374
	375	err_free_irq:
	376	free_irq(irq, pdev);
	377	err_unmap:
	378	iounmap(at91_rtc_regs);
	379
	380	return ret;
788b1fc6 AV	381	}
	382
	383	/*
	384	* Disable and remove the RTC driver
	385	*/
5d4675a8	386	static int __exit at91_rtc_remove(struct platform_device *pdev)
788b1fc6 AV	387	{
	388	struct rtc_device *rtc = platform_get_drvdata(pdev);
	389
	390	/* Disable all interrupts */
e304fcd0	391	at91_rtc_write_idr(AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
e7a8bb12 AM	392	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
e7a8bb12 AM	393	AT91_RTC_CALEV);
d28bdfc5	394	free_irq(irq, pdev);
788b1fc6 AV	395
788b1fc6 AV	396	rtc_device_unregister(rtc);
3427de92	397	iounmap(at91_rtc_regs);
788b1fc6 AV	398	platform_set_drvdata(pdev, NULL);
	399
	400	return 0;
	401	}
	402
6975a9c1	403	#ifdef CONFIG_PM_SLEEP
788b1fc6 AV	404
	405	/* AT91RM9200 RTC Power management control */
	406
e24b0bfa	407	static u32 at91_rtc_imr;
788b1fc6	408
dac94d9e	409	static int at91_rtc_suspend(struct device *dev)
788b1fc6	410	{
90b4d648 DB	411	/* this IRQ is shared with DBGU and other hardware which isn't
	412	* necessarily doing PM like we are...
	413	*/
e304fcd0	414	at91_rtc_imr = at91_rtc_read_imr()
e24b0bfa JH	415	& (AT91_RTC_ALARM\|AT91_RTC_SECEV);
	416	if (at91_rtc_imr) {
	417	if (device_may_wakeup(dev))
d28bdfc5	418	enable_irq_wake(irq);
e24b0bfa	419	else
e304fcd0	420	at91_rtc_write_idr(at91_rtc_imr);
e24b0bfa	421	}
788b1fc6 AV	422	return 0;
	423	}
	424
dac94d9e	425	static int at91_rtc_resume(struct device *dev)
788b1fc6	426	{
e24b0bfa JH	427	if (at91_rtc_imr) {
e24b0bfa JH	428	if (device_may_wakeup(dev))
d28bdfc5	429	disable_irq_wake(irq);
e24b0bfa	430	else
e304fcd0	431	at91_rtc_write_ier(at91_rtc_imr);
90b4d648	432	}
788b1fc6 AV	433	return 0;
788b1fc6 AV	434	}
788b1fc6 AV	435	#endif
788b1fc6 AV	436
6975a9c1 JH	437	static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
6975a9c1 JH	438
788b1fc6	439	static struct platform_driver at91_rtc_driver = {
5d4675a8	440	.remove = __exit_p(at91_rtc_remove),
788b1fc6 AV	441	.driver = {
	442	.name = "at91_rtc",
	443	.owner = THIS_MODULE,
6975a9c1	444	.pm = &at91_rtc_pm_ops,
7c1b68d4	445	.of_match_table = of_match_ptr(at91_rtc_dt_ids),
788b1fc6 AV	446	},
	447	};
	448
ac36960f	449	module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe);
788b1fc6 AV	450
	451	MODULE_AUTHOR("Rick Bronson");
	452	MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
	453	MODULE_LICENSE("GPL");
ad28a07b	454	MODULE_ALIAS("platform:at91_rtc");