[GitHub/LineageOS/android_kernel_samsung_universal7580.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 */

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 const struct of_device_id at91_rtc_dt_ids[] = {
	{ .compatible = "atmel,at91rm9200-rtc" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);

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 */
	44
	45	static DECLARE_COMPLETION(at91_rtc_updated);
	46	static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
d28bdfc5 JCPV	47	static void __iomem *at91_rtc_regs;
d28bdfc5 JCPV	48	static int irq;
788b1fc6	49
788b1fc6 AV	50	/*
	51	* Decode time/date into rtc_time structure
	52	*/
e7a8bb12 AM	53	static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
e7a8bb12 AM	54	struct rtc_time *tm)
788b1fc6 AV	55	{
	56	unsigned int time, date;
	57
	58	/* must read twice in case it changes */
	59	do {
d28bdfc5 JCPV	60	time = at91_rtc_read(timereg);
	61	date = at91_rtc_read(calreg);
	62	} while ((time != at91_rtc_read(timereg)) \|\|
	63	(date != at91_rtc_read(calreg)));
788b1fc6	64
fe20ba70 AB	65	tm->tm_sec = bcd2bin((time & AT91_RTC_SEC) >> 0);
	66	tm->tm_min = bcd2bin((time & AT91_RTC_MIN) >> 8);
	67	tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16);
788b1fc6 AV	68
	69	/*
	70	* The Calendar Alarm register does not have a field for
	71	* the year - so these will return an invalid value. When an
25985edc	72	* alarm is set, at91_alarm_year will store the current year.
788b1fc6	73	*/
fe20ba70 AB	74	tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */
fe20ba70 AB	75	tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */
788b1fc6	76
fe20ba70 AB	77	tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */
	78	tm->tm_mon = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1;
	79	tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24);
788b1fc6 AV	80	}
	81
	82	/*
	83	* Read current time and date in RTC
	84	*/
	85	static int at91_rtc_readtime(struct device dev, struct rtc_time tm)
	86	{
	87	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
	88	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	89	tm->tm_year = tm->tm_year - 1900;
	90
6588208c	91	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	92	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	93	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	94
	95	return 0;
	96	}
	97
	98	/*
	99	* Set current time and date in RTC
	100	*/
	101	static int at91_rtc_settime(struct device dev, struct rtc_time tm)
	102	{
	103	unsigned long cr;
	104
6588208c	105	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	106	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	107	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	108
788b1fc6 AV	109	/* Stop Time/Calendar from counting */
d28bdfc5 JCPV	110	cr = at91_rtc_read(AT91_RTC_CR);
d28bdfc5 JCPV	111	at91_rtc_write(AT91_RTC_CR, cr \| AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM);
788b1fc6	112
d28bdfc5	113	at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
e7a8bb12	114	wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
d28bdfc5	115	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
788b1fc6	116
d28bdfc5	117	at91_rtc_write(AT91_RTC_TIMR,
fe20ba70 AB	118	bin2bcd(tm->tm_sec) << 0
	119	\| bin2bcd(tm->tm_min) << 8
	120	\| bin2bcd(tm->tm_hour) << 16);
788b1fc6	121
d28bdfc5	122	at91_rtc_write(AT91_RTC_CALR,
fe20ba70 AB	123	bin2bcd((tm->tm_year + 1900) / 100) /* century */
	124	\| bin2bcd(tm->tm_year % 100) << 8 /* year */
	125	\| bin2bcd(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */
	126	\| bin2bcd(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */
	127	\| bin2bcd(tm->tm_mday) << 24);
788b1fc6 AV	128
788b1fc6 AV	129	/* Restart Time/Calendar */
d28bdfc5 JCPV	130	cr = at91_rtc_read(AT91_RTC_CR);
d28bdfc5 JCPV	131	at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM));
788b1fc6 AV	132
	133	return 0;
	134	}
	135
	136	/*
	137	* Read alarm time and date in RTC
	138	*/
	139	static int at91_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	140	{
	141	struct rtc_time *tm = &alrm->time;
	142
	143	at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
	144	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	145	tm->tm_year = at91_alarm_year - 1900;
	146
e24b0bfa	147	alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
a2db8dfc DB	148	? 1 : 0;
a2db8dfc DB	149
6588208c	150	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	151	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	152	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	153
	154	return 0;
	155	}
	156
	157	/*
	158	* Set alarm time and date in RTC
	159	*/
	160	static int at91_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	161	{
	162	struct rtc_time tm;
	163
	164	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
	165
	166	at91_alarm_year = tm.tm_year;
	167
	168	tm.tm_hour = alrm->time.tm_hour;
	169	tm.tm_min = alrm->time.tm_min;
	170	tm.tm_sec = alrm->time.tm_sec;
	171
d28bdfc5 JCPV	172	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
d28bdfc5 JCPV	173	at91_rtc_write(AT91_RTC_TIMALR,
fe20ba70 AB	174	bin2bcd(tm.tm_sec) << 0
	175	\| bin2bcd(tm.tm_min) << 8
	176	\| bin2bcd(tm.tm_hour) << 16
788b1fc6	177	\| AT91_RTC_HOUREN \| AT91_RTC_MINEN \| AT91_RTC_SECEN);
d28bdfc5	178	at91_rtc_write(AT91_RTC_CALALR,
fe20ba70 AB	179	bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */
fe20ba70 AB	180	\| bin2bcd(tm.tm_mday) << 24
788b1fc6 AV	181	\| AT91_RTC_DATEEN \| AT91_RTC_MTHEN);
788b1fc6 AV	182
449321b3	183	if (alrm->enabled) {
d28bdfc5 JCPV	184	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
d28bdfc5 JCPV	185	at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
449321b3	186	}
5d4675a8	187
6588208c	188	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	189	at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
e7a8bb12 AM	190	tm.tm_min, tm.tm_sec);
788b1fc6 AV	191
	192	return 0;
	193	}
	194
16380c15 JS	195	static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
16380c15 JS	196	{
6588208c	197	dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled);
16380c15 JS	198
16380c15 JS	199	if (enabled) {
d28bdfc5 JCPV	200	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
d28bdfc5 JCPV	201	at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
e24b0bfa	202	} else
d28bdfc5	203	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
16380c15 JS	204
	205	return 0;
	206	}
788b1fc6 AV	207	/*
	208	* Provide additional RTC information in /proc/driver/rtc
	209	*/
	210	static int at91_rtc_proc(struct device dev, struct seq_file seq)
	211	{
e24b0bfa JH	212	unsigned long imr = at91_rtc_read(AT91_RTC_IMR);
e24b0bfa JH	213
e7a8bb12	214	seq_printf(seq, "update_IRQ\t: %s\n",
e24b0bfa	215	(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
e7a8bb12	216	seq_printf(seq, "periodic_IRQ\t: %s\n",
e24b0bfa	217	(imr & AT91_RTC_SECEV) ? "yes" : "no");
788b1fc6 AV	218
	219	return 0;
	220	}
	221
	222	/*
	223	* IRQ handler for the RTC
	224	*/
7d12e780	225	static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
788b1fc6	226	{
e7a8bb12	227	struct platform_device *pdev = dev_id;
788b1fc6 AV	228	struct rtc_device *rtc = platform_get_drvdata(pdev);
	229	unsigned int rtsr;
	230	unsigned long events = 0;
	231
e24b0bfa	232	rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR);
788b1fc6 AV	233	if (rtsr) { /* this interrupt is shared! Is it ours? */
	234	if (rtsr & AT91_RTC_ALARM)
	235	events \|= (RTC_AF \| RTC_IRQF);
	236	if (rtsr & AT91_RTC_SECEV)
	237	events \|= (RTC_UF \| RTC_IRQF);
	238	if (rtsr & AT91_RTC_ACKUPD)
	239	complete(&at91_rtc_updated);
	240
d28bdfc5	241	at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
788b1fc6	242
ab6a2d70	243	rtc_update_irq(rtc, 1, events);
788b1fc6	244
6588208c	245	dev_dbg(&pdev->dev, "%s(): num=%ld, events=0x%02lx\n", __func__,
788b1fc6 AV	246	events >> 8, events & 0x000000FF);
	247
	248	return IRQ_HANDLED;
	249	}
	250	return IRQ_NONE; /* not handled */
	251	}
	252
ff8371ac	253	static const struct rtc_class_ops at91_rtc_ops = {
788b1fc6 AV	254	.read_time = at91_rtc_readtime,
	255	.set_time = at91_rtc_settime,
	256	.read_alarm = at91_rtc_readalarm,
	257	.set_alarm = at91_rtc_setalarm,
	258	.proc = at91_rtc_proc,
16380c15	259	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
788b1fc6 AV	260	};
	261
	262	/*
	263	* Initialize and install RTC driver
	264	*/
	265	static int __init at91_rtc_probe(struct platform_device *pdev)
	266	{
	267	struct rtc_device *rtc;
d28bdfc5 JCPV	268	struct resource *regs;
d28bdfc5 JCPV	269	int ret = 0;
788b1fc6	270
d28bdfc5 JCPV	271	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	272	if (!regs) {
	273	dev_err(&pdev->dev, "no mmio resource defined\n");
	274	return -ENXIO;
	275	}
	276
	277	irq = platform_get_irq(pdev, 0);
	278	if (irq < 0) {
	279	dev_err(&pdev->dev, "no irq resource defined\n");
	280	return -ENXIO;
	281	}
	282
	283	at91_rtc_regs = ioremap(regs->start, resource_size(regs));
	284	if (!at91_rtc_regs) {
	285	dev_err(&pdev->dev, "failed to map registers, aborting.\n");
	286	return -ENOMEM;
	287	}
	288
	289	at91_rtc_write(AT91_RTC_CR, 0);
	290	at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */
788b1fc6 AV	291
788b1fc6 AV	292	/* Disable all interrupts */
d28bdfc5	293	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
e7a8bb12 AM	294	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
e7a8bb12 AM	295	AT91_RTC_CALEV);
788b1fc6	296
d28bdfc5	297	ret = request_irq(irq, at91_rtc_interrupt,
dac94d9e	298	IRQF_SHARED,
d728b1e6	299	"at91_rtc", pdev);
788b1fc6	300	if (ret) {
6588208c	301	dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
788b1fc6 AV	302	return ret;
	303	}
	304
5d4675a8 DB	305	/* cpu init code should really have flagged this device as
	306	* being wake-capable; if it didn't, do that here.
	307	*/
	308	if (!device_can_wakeup(&pdev->dev))
	309	device_init_wakeup(&pdev->dev, 1);
	310
e7a8bb12 AM	311	rtc = rtc_device_register(pdev->name, &pdev->dev,
e7a8bb12 AM	312	&at91_rtc_ops, THIS_MODULE);
788b1fc6	313	if (IS_ERR(rtc)) {
d28bdfc5	314	free_irq(irq, pdev);
788b1fc6 AV	315	return PTR_ERR(rtc);
	316	}
	317	platform_set_drvdata(pdev, rtc);
	318
6588208c	319	dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
788b1fc6 AV	320	return 0;
	321	}
	322
	323	/*
	324	* Disable and remove the RTC driver
	325	*/
5d4675a8	326	static int __exit at91_rtc_remove(struct platform_device *pdev)
788b1fc6 AV	327	{
	328	struct rtc_device *rtc = platform_get_drvdata(pdev);
	329
	330	/* Disable all interrupts */
d28bdfc5	331	at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
e7a8bb12 AM	332	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
e7a8bb12 AM	333	AT91_RTC_CALEV);
d28bdfc5	334	free_irq(irq, pdev);
788b1fc6 AV	335
	336	rtc_device_unregister(rtc);
	337	platform_set_drvdata(pdev, NULL);
	338
	339	return 0;
	340	}
	341
6975a9c1	342	#ifdef CONFIG_PM_SLEEP
788b1fc6 AV	343
	344	/* AT91RM9200 RTC Power management control */
	345
e24b0bfa	346	static u32 at91_rtc_imr;
788b1fc6	347
dac94d9e	348	static int at91_rtc_suspend(struct device *dev)
788b1fc6	349	{
90b4d648 DB	350	/* this IRQ is shared with DBGU and other hardware which isn't
	351	* necessarily doing PM like we are...
	352	*/
e24b0bfa JH	353	at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR)
	354	& (AT91_RTC_ALARM\|AT91_RTC_SECEV);
	355	if (at91_rtc_imr) {
	356	if (device_may_wakeup(dev))
d28bdfc5	357	enable_irq_wake(irq);
e24b0bfa JH	358	else
	359	at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr);
	360	}
788b1fc6 AV	361	return 0;
	362	}
	363
dac94d9e	364	static int at91_rtc_resume(struct device *dev)
788b1fc6	365	{
e24b0bfa JH	366	if (at91_rtc_imr) {
e24b0bfa JH	367	if (device_may_wakeup(dev))
d28bdfc5	368	disable_irq_wake(irq);
e24b0bfa JH	369	else
e24b0bfa JH	370	at91_rtc_write(AT91_RTC_IER, at91_rtc_imr);
90b4d648	371	}
788b1fc6 AV	372	return 0;
788b1fc6 AV	373	}
788b1fc6 AV	374	#endif
788b1fc6 AV	375
6975a9c1 JH	376	static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
6975a9c1 JH	377
7c1b68d4 JE	378	static const struct of_device_id at91_rtc_dt_ids[] = {
	379	{ .compatible = "atmel,at91rm9200-rtc" },
	380	{ /* sentinel */ }
	381	};
	382	MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
	383
788b1fc6	384	static struct platform_driver at91_rtc_driver = {
5d4675a8	385	.remove = __exit_p(at91_rtc_remove),
788b1fc6 AV	386	.driver = {
	387	.name = "at91_rtc",
	388	.owner = THIS_MODULE,
6975a9c1	389	.pm = &at91_rtc_pm_ops,
7c1b68d4	390	.of_match_table = of_match_ptr(at91_rtc_dt_ids),
788b1fc6 AV	391	},
	392	};
	393
ac36960f	394	module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe);
788b1fc6 AV	395
	396	MODULE_AUTHOR("Rick Bronson");
	397	MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
	398	MODULE_LICENSE("GPL");
ad28a07b	399	MODULE_ALIAS("platform:at91_rtc");