[GitHub/mt8127/android_kernel_alcatel_ttab.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/spinlock.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 {
	bool use_shadow_imr;
};

static const struct at91_rtc_config *at91_rtc_config;
static DECLARE_COMPLETION(at91_rtc_updated);
static DECLARE_COMPLETION(at91_rtc_upd_rdy);
static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
static void __iomem *at91_rtc_regs;
static int irq;
static DEFINE_SPINLOCK(at91_rtc_lock);
static u32 at91_rtc_shadow_imr;

static void at91_rtc_write_ier(u32 mask)
{
	unsigned long flags;

	spin_lock_irqsave(&at91_rtc_lock, flags);
	at91_rtc_shadow_imr |= mask;
	at91_rtc_write(AT91_RTC_IER, mask);
	spin_unlock_irqrestore(&at91_rtc_lock, flags);
}

static void at91_rtc_write_idr(u32 mask)
{
	unsigned long flags;

	spin_lock_irqsave(&at91_rtc_lock, flags);
	at91_rtc_write(AT91_RTC_IDR, mask);
	/*
	 * Register read back (of any RTC-register) needed to make sure
	 * IDR-register write has reached the peripheral before updating
	 * shadow mask.
	 *
	 * Note that there is still a possibility that the mask is updated
	 * before interrupts have actually been disabled in hardware. The only
	 * way to be certain would be to poll the IMR-register, which is is
	 * the very register we are trying to emulate. The register read back
	 * is a reasonable heuristic.
	 */
	at91_rtc_read(AT91_RTC_SR);
	at91_rtc_shadow_imr &= ~mask;
	spin_unlock_irqrestore(&at91_rtc_lock, flags);
}

static u32 at91_rtc_read_imr(void)
{
	unsigned long flags;
	u32 mask;

	if (at91_rtc_config->use_shadow_imr) {
		spin_lock_irqsave(&at91_rtc_lock, flags);
		mask = at91_rtc_shadow_imr;
		spin_unlock_irqrestore(&at91_rtc_lock, flags);
	} else {
		mask = at91_rtc_read(AT91_RTC_IMR);
	}

	return mask;
}

/*
 * 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);

	wait_for_completion(&at91_rtc_upd_rdy);

	/* 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_SCCR, AT91_RTC_SECEV);
	at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));
	at91_rtc_write_ier(AT91_RTC_SECEV);

	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_mon = alrm->time.tm_mon;
	tm.tm_mday = alrm->time.tm_mday;
	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) {
			complete(&at91_rtc_upd_rdy);
			at91_rtc_write_idr(AT91_RTC_SECEV);
		}
		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 = {
};

static const struct at91_rtc_config at91sam9x5_config = {
	.use_shadow_imr	= true,
};

#ifdef CONFIG_OF
static const struct of_device_id at91_rtc_dt_ids[] = {
	{
		.compatible = "atmel,at91rm9200-rtc",
		.data = &at91rm9200_config,
	}, {
		.compatible = "atmel,at91sam9x5-rtc",
		.data = &at91sam9x5_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);

	/* enable SECEV interrupt in order to initialize at91_rtc_upd_rdy
	 * completion.
	 */
	at91_rtc_write_ier(AT91_RTC_SECEV);

	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>
e9f08bbe	28	#include <linux/spinlock.h>
788b1fc6 AV	29	#include <linux/ioctl.h>
788b1fc6 AV	30	#include <linux/completion.h>
14070ade	31	#include <linux/io.h>
7c1b68d4 JE	32	#include <linux/of.h>
7c1b68d4 JE	33	#include <linux/of_device.h>
788b1fc6 AV	34
788b1fc6 AV	35	#include <asm/uaccess.h>
fb0d4ec4	36
75984df0	37	#include "rtc-at91rm9200.h"
d73e3cd7	38
d28bdfc5 JCPV	39	#define at91_rtc_read(field) \
	40	__raw_readl(at91_rtc_regs + field)
	41	#define at91_rtc_write(field, val) \
	42	__raw_writel((val), at91_rtc_regs + field)
788b1fc6	43
788b1fc6 AV	44	#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */
788b1fc6 AV	45
de645475	46	struct at91_rtc_config {
e9f08bbe	47	bool use_shadow_imr;
de645475 JH	48	};
	49
	50	static const struct at91_rtc_config *at91_rtc_config;
788b1fc6	51	static DECLARE_COMPLETION(at91_rtc_updated);
4b6b037c	52	static DECLARE_COMPLETION(at91_rtc_upd_rdy);
788b1fc6	53	static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
d28bdfc5 JCPV	54	static void __iomem *at91_rtc_regs;
d28bdfc5 JCPV	55	static int irq;
e9f08bbe JH	56	static DEFINE_SPINLOCK(at91_rtc_lock);
e9f08bbe JH	57	static u32 at91_rtc_shadow_imr;
788b1fc6	58
e304fcd0 JH	59	static void at91_rtc_write_ier(u32 mask)
e304fcd0 JH	60	{
e9f08bbe JH	61	unsigned long flags;
	62
	63	spin_lock_irqsave(&at91_rtc_lock, flags);
	64	at91_rtc_shadow_imr \|= mask;
e304fcd0	65	at91_rtc_write(AT91_RTC_IER, mask);
e9f08bbe	66	spin_unlock_irqrestore(&at91_rtc_lock, flags);
e304fcd0 JH	67	}
	68
	69	static void at91_rtc_write_idr(u32 mask)
	70	{
e9f08bbe JH	71	unsigned long flags;
	72
	73	spin_lock_irqsave(&at91_rtc_lock, flags);
e304fcd0	74	at91_rtc_write(AT91_RTC_IDR, mask);
e9f08bbe JH	75	/*
	76	* Register read back (of any RTC-register) needed to make sure
	77	* IDR-register write has reached the peripheral before updating
	78	* shadow mask.
	79	*
	80	* Note that there is still a possibility that the mask is updated
	81	* before interrupts have actually been disabled in hardware. The only
	82	* way to be certain would be to poll the IMR-register, which is is
	83	* the very register we are trying to emulate. The register read back
	84	* is a reasonable heuristic.
	85	*/
	86	at91_rtc_read(AT91_RTC_SR);
	87	at91_rtc_shadow_imr &= ~mask;
	88	spin_unlock_irqrestore(&at91_rtc_lock, flags);
e304fcd0 JH	89	}
	90
	91	static u32 at91_rtc_read_imr(void)
	92	{
e9f08bbe JH	93	unsigned long flags;
	94	u32 mask;
	95
	96	if (at91_rtc_config->use_shadow_imr) {
	97	spin_lock_irqsave(&at91_rtc_lock, flags);
	98	mask = at91_rtc_shadow_imr;
	99	spin_unlock_irqrestore(&at91_rtc_lock, flags);
	100	} else {
	101	mask = at91_rtc_read(AT91_RTC_IMR);
	102	}
	103
	104	return mask;
e304fcd0 JH	105	}
e304fcd0 JH	106
788b1fc6 AV	107	/*
	108	* Decode time/date into rtc_time structure
	109	*/
e7a8bb12 AM	110	static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
e7a8bb12 AM	111	struct rtc_time *tm)
788b1fc6 AV	112	{
	113	unsigned int time, date;
	114
	115	/* must read twice in case it changes */
	116	do {
d28bdfc5 JCPV	117	time = at91_rtc_read(timereg);
	118	date = at91_rtc_read(calreg);
	119	} while ((time != at91_rtc_read(timereg)) \|\|
	120	(date != at91_rtc_read(calreg)));
788b1fc6	121
fe20ba70 AB	122	tm->tm_sec = bcd2bin((time & AT91_RTC_SEC) >> 0);
	123	tm->tm_min = bcd2bin((time & AT91_RTC_MIN) >> 8);
	124	tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16);
788b1fc6 AV	125
	126	/*
	127	* The Calendar Alarm register does not have a field for
	128	* the year - so these will return an invalid value. When an
25985edc	129	* alarm is set, at91_alarm_year will store the current year.
788b1fc6	130	*/
fe20ba70 AB	131	tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */
fe20ba70 AB	132	tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */
788b1fc6	133
fe20ba70 AB	134	tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */
	135	tm->tm_mon = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1;
	136	tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24);
788b1fc6 AV	137	}
	138
	139	/*
	140	* Read current time and date in RTC
	141	*/
	142	static int at91_rtc_readtime(struct device dev, struct rtc_time tm)
	143	{
	144	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
	145	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	146	tm->tm_year = tm->tm_year - 1900;
	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 current time and date in RTC
	157	*/
	158	static int at91_rtc_settime(struct device dev, struct rtc_time tm)
	159	{
	160	unsigned long cr;
	161
6588208c	162	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	163	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	164	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6	165
4b6b037c BB	166	wait_for_completion(&at91_rtc_upd_rdy);
4b6b037c BB	167
788b1fc6	168	/* Stop Time/Calendar from counting */
d28bdfc5 JCPV	169	cr = at91_rtc_read(AT91_RTC_CR);
d28bdfc5 JCPV	170	at91_rtc_write(AT91_RTC_CR, cr \| AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM);
788b1fc6	171
e304fcd0	172	at91_rtc_write_ier(AT91_RTC_ACKUPD);
e7a8bb12	173	wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
e304fcd0	174	at91_rtc_write_idr(AT91_RTC_ACKUPD);
788b1fc6	175
d28bdfc5	176	at91_rtc_write(AT91_RTC_TIMR,
fe20ba70 AB	177	bin2bcd(tm->tm_sec) << 0
	178	\| bin2bcd(tm->tm_min) << 8
	179	\| bin2bcd(tm->tm_hour) << 16);
788b1fc6	180
d28bdfc5	181	at91_rtc_write(AT91_RTC_CALR,
fe20ba70 AB	182	bin2bcd((tm->tm_year + 1900) / 100) /* century */
	183	\| bin2bcd(tm->tm_year % 100) << 8 /* year */
	184	\| bin2bcd(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */
	185	\| bin2bcd(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */
	186	\| bin2bcd(tm->tm_mday) << 24);
788b1fc6 AV	187
788b1fc6 AV	188	/* Restart Time/Calendar */
d28bdfc5	189	cr = at91_rtc_read(AT91_RTC_CR);
4b6b037c	190	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_SECEV);
d28bdfc5	191	at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL \| AT91_RTC_UPDTIM));
4b6b037c	192	at91_rtc_write_ier(AT91_RTC_SECEV);
788b1fc6 AV	193
	194	return 0;
	195	}
	196
	197	/*
	198	* Read alarm time and date in RTC
	199	*/
	200	static int at91_rtc_readalarm(struct device dev, struct rtc_wkalrm alrm)
	201	{
	202	struct rtc_time *tm = &alrm->time;
	203
	204	at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
	205	tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
	206	tm->tm_year = at91_alarm_year - 1900;
	207
e304fcd0	208	alrm->enabled = (at91_rtc_read_imr() & AT91_RTC_ALARM)
a2db8dfc DB	209	? 1 : 0;
a2db8dfc DB	210
6588208c	211	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	212	1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
e7a8bb12 AM	213	tm->tm_hour, tm->tm_min, tm->tm_sec);
788b1fc6 AV	214
	215	return 0;
	216	}
	217
	218	/*
	219	* Set alarm time and date in RTC
	220	*/
	221	static int at91_rtc_setalarm(struct device dev, struct rtc_wkalrm alrm)
	222	{
	223	struct rtc_time tm;
	224
	225	at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm);
	226
	227	at91_alarm_year = tm.tm_year;
	228
8de7e61b LP	229	tm.tm_mon = alrm->time.tm_mon;
8de7e61b LP	230	tm.tm_mday = alrm->time.tm_mday;
788b1fc6 AV	231	tm.tm_hour = alrm->time.tm_hour;
	232	tm.tm_min = alrm->time.tm_min;
	233	tm.tm_sec = alrm->time.tm_sec;
	234
e304fcd0	235	at91_rtc_write_idr(AT91_RTC_ALARM);
d28bdfc5	236	at91_rtc_write(AT91_RTC_TIMALR,
fe20ba70 AB	237	bin2bcd(tm.tm_sec) << 0
	238	\| bin2bcd(tm.tm_min) << 8
	239	\| bin2bcd(tm.tm_hour) << 16
788b1fc6	240	\| AT91_RTC_HOUREN \| AT91_RTC_MINEN \| AT91_RTC_SECEN);
d28bdfc5	241	at91_rtc_write(AT91_RTC_CALALR,
fe20ba70 AB	242	bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */
fe20ba70 AB	243	\| bin2bcd(tm.tm_mday) << 24
788b1fc6 AV	244	\| AT91_RTC_DATEEN \| AT91_RTC_MTHEN);
788b1fc6 AV	245
449321b3	246	if (alrm->enabled) {
d28bdfc5	247	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
e304fcd0	248	at91_rtc_write_ier(AT91_RTC_ALARM);
449321b3	249	}
5d4675a8	250
6588208c	251	dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
e7a8bb12 AM	252	at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour,
e7a8bb12 AM	253	tm.tm_min, tm.tm_sec);
788b1fc6 AV	254
	255	return 0;
	256	}
	257
16380c15 JS	258	static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
16380c15 JS	259	{
6588208c	260	dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled);
16380c15 JS	261
16380c15 JS	262	if (enabled) {
d28bdfc5	263	at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
e304fcd0	264	at91_rtc_write_ier(AT91_RTC_ALARM);
e24b0bfa	265	} else
e304fcd0	266	at91_rtc_write_idr(AT91_RTC_ALARM);
16380c15 JS	267
	268	return 0;
	269	}
788b1fc6 AV	270	/*
	271	* Provide additional RTC information in /proc/driver/rtc
	272	*/
	273	static int at91_rtc_proc(struct device dev, struct seq_file seq)
	274	{
e304fcd0	275	unsigned long imr = at91_rtc_read_imr();
e24b0bfa	276
e7a8bb12	277	seq_printf(seq, "update_IRQ\t: %s\n",
e24b0bfa	278	(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
e7a8bb12	279	seq_printf(seq, "periodic_IRQ\t: %s\n",
e24b0bfa	280	(imr & AT91_RTC_SECEV) ? "yes" : "no");
788b1fc6 AV	281
	282	return 0;
	283	}
	284
	285	/*
	286	* IRQ handler for the RTC
	287	*/
7d12e780	288	static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
788b1fc6	289	{
e7a8bb12	290	struct platform_device *pdev = dev_id;
788b1fc6 AV	291	struct rtc_device *rtc = platform_get_drvdata(pdev);
	292	unsigned int rtsr;
	293	unsigned long events = 0;
	294
e304fcd0	295	rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read_imr();
788b1fc6 AV	296	if (rtsr) { /* this interrupt is shared! Is it ours? */
	297	if (rtsr & AT91_RTC_ALARM)
	298	events \|= (RTC_AF \| RTC_IRQF);
4b6b037c BB	299	if (rtsr & AT91_RTC_SECEV) {
	300	complete(&at91_rtc_upd_rdy);
	301	at91_rtc_write_idr(AT91_RTC_SECEV);
	302	}
788b1fc6 AV	303	if (rtsr & AT91_RTC_ACKUPD)
	304	complete(&at91_rtc_updated);
	305
d28bdfc5	306	at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
788b1fc6	307
ab6a2d70	308	rtc_update_irq(rtc, 1, events);
788b1fc6	309
6588208c	310	dev_dbg(&pdev->dev, "%s(): num=%ld, events=0x%02lx\n", __func__,
788b1fc6 AV	311	events >> 8, events & 0x000000FF);
	312
	313	return IRQ_HANDLED;
	314	}
	315	return IRQ_NONE; /* not handled */
	316	}
	317
de645475 JH	318	static const struct at91_rtc_config at91rm9200_config = {
	319	};
	320
bba00e59 JH	321	static const struct at91_rtc_config at91sam9x5_config = {
	322	.use_shadow_imr = true,
	323	};
	324
de645475 JH	325	#ifdef CONFIG_OF
	326	static const struct of_device_id at91_rtc_dt_ids[] = {
	327	{
	328	.compatible = "atmel,at91rm9200-rtc",
	329	.data = &at91rm9200_config,
bba00e59 JH	330	}, {
	331	.compatible = "atmel,at91sam9x5-rtc",
	332	.data = &at91sam9x5_config,
de645475 JH	333	}, {
	334	/* sentinel */
	335	}
	336	};
	337	MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
	338	#endif
	339
	340	static const struct at91_rtc_config *
	341	at91_rtc_get_config(struct platform_device *pdev)
	342	{
	343	const struct of_device_id *match;
	344
	345	if (pdev->dev.of_node) {
	346	match = of_match_node(at91_rtc_dt_ids, pdev->dev.of_node);
	347	if (!match)
	348	return NULL;
	349	return (const struct at91_rtc_config *)match->data;
	350	}
	351
	352	return &at91rm9200_config;
	353	}
	354
ff8371ac	355	static const struct rtc_class_ops at91_rtc_ops = {
788b1fc6 AV	356	.read_time = at91_rtc_readtime,
	357	.set_time = at91_rtc_settime,
	358	.read_alarm = at91_rtc_readalarm,
	359	.set_alarm = at91_rtc_setalarm,
	360	.proc = at91_rtc_proc,
16380c15	361	.alarm_irq_enable = at91_rtc_alarm_irq_enable,
788b1fc6 AV	362	};
	363
	364	/*
	365	* Initialize and install RTC driver
	366	*/
	367	static int __init at91_rtc_probe(struct platform_device *pdev)
	368	{
	369	struct rtc_device *rtc;
d28bdfc5 JCPV	370	struct resource *regs;
d28bdfc5 JCPV	371	int ret = 0;
788b1fc6	372
de645475 JH	373	at91_rtc_config = at91_rtc_get_config(pdev);
	374	if (!at91_rtc_config)
	375	return -ENODEV;
	376
d28bdfc5 JCPV	377	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	378	if (!regs) {
	379	dev_err(&pdev->dev, "no mmio resource defined\n");
	380	return -ENXIO;
	381	}
	382
	383	irq = platform_get_irq(pdev, 0);
	384	if (irq < 0) {
	385	dev_err(&pdev->dev, "no irq resource defined\n");
	386	return -ENXIO;
	387	}
	388
	389	at91_rtc_regs = ioremap(regs->start, resource_size(regs));
	390	if (!at91_rtc_regs) {
	391	dev_err(&pdev->dev, "failed to map registers, aborting.\n");
	392	return -ENOMEM;
	393	}
	394
	395	at91_rtc_write(AT91_RTC_CR, 0);
	396	at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */
788b1fc6 AV	397
788b1fc6 AV	398	/* Disable all interrupts */
e304fcd0	399	at91_rtc_write_idr(AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
e7a8bb12 AM	400	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
e7a8bb12 AM	401	AT91_RTC_CALEV);
788b1fc6	402
d28bdfc5	403	ret = request_irq(irq, at91_rtc_interrupt,
dac94d9e	404	IRQF_SHARED,
d728b1e6	405	"at91_rtc", pdev);
788b1fc6	406	if (ret) {
6588208c	407	dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
3427de92	408	goto err_unmap;
788b1fc6 AV	409	}
788b1fc6 AV	410
5d4675a8 DB	411	/* cpu init code should really have flagged this device as
	412	* being wake-capable; if it didn't, do that here.
	413	*/
	414	if (!device_can_wakeup(&pdev->dev))
	415	device_init_wakeup(&pdev->dev, 1);
	416
e7a8bb12 AM	417	rtc = rtc_device_register(pdev->name, &pdev->dev,
e7a8bb12 AM	418	&at91_rtc_ops, THIS_MODULE);
788b1fc6	419	if (IS_ERR(rtc)) {
3427de92 JH	420	ret = PTR_ERR(rtc);
3427de92 JH	421	goto err_free_irq;
788b1fc6 AV	422	}
	423	platform_set_drvdata(pdev, rtc);
	424
4b6b037c BB	425	/* enable SECEV interrupt in order to initialize at91_rtc_upd_rdy
	426	* completion.
	427	*/
	428	at91_rtc_write_ier(AT91_RTC_SECEV);
	429
6588208c	430	dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
788b1fc6	431	return 0;
3427de92 JH	432
	433	err_free_irq:
	434	free_irq(irq, pdev);
	435	err_unmap:
	436	iounmap(at91_rtc_regs);
	437
	438	return ret;
788b1fc6 AV	439	}
	440
	441	/*
	442	* Disable and remove the RTC driver
	443	*/
5d4675a8	444	static int __exit at91_rtc_remove(struct platform_device *pdev)
788b1fc6 AV	445	{
	446	struct rtc_device *rtc = platform_get_drvdata(pdev);
	447
	448	/* Disable all interrupts */
e304fcd0	449	at91_rtc_write_idr(AT91_RTC_ACKUPD \| AT91_RTC_ALARM \|
e7a8bb12 AM	450	AT91_RTC_SECEV \| AT91_RTC_TIMEV \|
e7a8bb12 AM	451	AT91_RTC_CALEV);
d28bdfc5	452	free_irq(irq, pdev);
788b1fc6 AV	453
788b1fc6 AV	454	rtc_device_unregister(rtc);
3427de92	455	iounmap(at91_rtc_regs);
788b1fc6 AV	456	platform_set_drvdata(pdev, NULL);
	457
	458	return 0;
	459	}
	460
6975a9c1	461	#ifdef CONFIG_PM_SLEEP
788b1fc6 AV	462
	463	/* AT91RM9200 RTC Power management control */
	464
e24b0bfa	465	static u32 at91_rtc_imr;
788b1fc6	466
dac94d9e	467	static int at91_rtc_suspend(struct device *dev)
788b1fc6	468	{
90b4d648 DB	469	/* this IRQ is shared with DBGU and other hardware which isn't
	470	* necessarily doing PM like we are...
	471	*/
e304fcd0	472	at91_rtc_imr = at91_rtc_read_imr()
e24b0bfa JH	473	& (AT91_RTC_ALARM\|AT91_RTC_SECEV);
	474	if (at91_rtc_imr) {
	475	if (device_may_wakeup(dev))
d28bdfc5	476	enable_irq_wake(irq);
e24b0bfa	477	else
e304fcd0	478	at91_rtc_write_idr(at91_rtc_imr);
e24b0bfa	479	}
788b1fc6 AV	480	return 0;
	481	}
	482
dac94d9e	483	static int at91_rtc_resume(struct device *dev)
788b1fc6	484	{
e24b0bfa JH	485	if (at91_rtc_imr) {
e24b0bfa JH	486	if (device_may_wakeup(dev))
d28bdfc5	487	disable_irq_wake(irq);
e24b0bfa	488	else
e304fcd0	489	at91_rtc_write_ier(at91_rtc_imr);
90b4d648	490	}
788b1fc6 AV	491	return 0;
788b1fc6 AV	492	}
788b1fc6 AV	493	#endif
788b1fc6 AV	494
6975a9c1 JH	495	static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
6975a9c1 JH	496
788b1fc6	497	static struct platform_driver at91_rtc_driver = {
5d4675a8	498	.remove = __exit_p(at91_rtc_remove),
788b1fc6 AV	499	.driver = {
	500	.name = "at91_rtc",
	501	.owner = THIS_MODULE,
6975a9c1	502	.pm = &at91_rtc_pm_ops,
7c1b68d4	503	.of_match_table = of_match_ptr(at91_rtc_dt_ids),
788b1fc6 AV	504	},
	505	};
	506
ac36960f	507	module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe);
788b1fc6 AV	508
	509	MODULE_AUTHOR("Rick Bronson");
	510	MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
	511	MODULE_LICENSE("GPL");
ad28a07b	512	MODULE_ALIAS("platform:at91_rtc");