[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / rtc / rtc-stk17ta8.c

/*
 * A RTC driver for the Simtek STK17TA8
 *
 * By Thomas Hommel <thomas.hommel@gefanuc.com>
 *
 * Based on the DS1553 driver from
 * Atsushi Nemoto <anemo@mba.ocn.ne.jp>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/bcd.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/delay.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/io.h>

#define DRV_VERSION "0.1"

#define RTC_REG_SIZE		0x20000
#define RTC_OFFSET		0x1fff0

#define RTC_FLAGS		(RTC_OFFSET + 0)
#define RTC_CENTURY		(RTC_OFFSET + 1)
#define RTC_SECONDS_ALARM	(RTC_OFFSET + 2)
#define RTC_MINUTES_ALARM	(RTC_OFFSET + 3)
#define RTC_HOURS_ALARM		(RTC_OFFSET + 4)
#define RTC_DATE_ALARM		(RTC_OFFSET + 5)
#define RTC_INTERRUPTS		(RTC_OFFSET + 6)
#define RTC_WATCHDOG		(RTC_OFFSET + 7)
#define RTC_CALIBRATION		(RTC_OFFSET + 8)
#define RTC_SECONDS		(RTC_OFFSET + 9)
#define RTC_MINUTES		(RTC_OFFSET + 10)
#define RTC_HOURS		(RTC_OFFSET + 11)
#define RTC_DAY			(RTC_OFFSET + 12)
#define RTC_DATE		(RTC_OFFSET + 13)
#define RTC_MONTH		(RTC_OFFSET + 14)
#define RTC_YEAR		(RTC_OFFSET + 15)

#define RTC_SECONDS_MASK	0x7f
#define RTC_DAY_MASK		0x07
#define RTC_CAL_MASK		0x3f

/* Bits in the Calibration register */
#define RTC_STOP		0x80

/* Bits in the Flags register */
#define RTC_FLAGS_AF		0x40
#define RTC_FLAGS_PF		0x20
#define RTC_WRITE		0x02
#define RTC_READ		0x01

/* Bits in the Interrupts register */
#define RTC_INTS_AIE		0x40

struct rtc_plat_data {
	struct rtc_device *rtc;
	void __iomem *ioaddr;
	unsigned long last_jiffies;
	int irq;
	unsigned int irqen;
	int alrm_sec;
	int alrm_min;
	int alrm_hour;
	int alrm_mday;
	spinlock_t lock;
};

static int stk17ta8_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	u8 flags;

	flags = readb(pdata->ioaddr + RTC_FLAGS);
	writeb(flags | RTC_WRITE, pdata->ioaddr + RTC_FLAGS);

	writeb(bin2bcd(tm->tm_year % 100), ioaddr + RTC_YEAR);
	writeb(bin2bcd(tm->tm_mon + 1), ioaddr + RTC_MONTH);
	writeb(bin2bcd(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY);
	writeb(bin2bcd(tm->tm_mday), ioaddr + RTC_DATE);
	writeb(bin2bcd(tm->tm_hour), ioaddr + RTC_HOURS);
	writeb(bin2bcd(tm->tm_min), ioaddr + RTC_MINUTES);
	writeb(bin2bcd(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS);
	writeb(bin2bcd((tm->tm_year + 1900) / 100), ioaddr + RTC_CENTURY);

	writeb(flags & ~RTC_WRITE, pdata->ioaddr + RTC_FLAGS);
	return 0;
}

static int stk17ta8_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	unsigned int year, month, day, hour, minute, second, week;
	unsigned int century;
	u8 flags;

	/* give enough time to update RTC in case of continuous read */
	if (pdata->last_jiffies == jiffies)
		msleep(1);
	pdata->last_jiffies = jiffies;

	flags = readb(pdata->ioaddr + RTC_FLAGS);
	writeb(flags | RTC_READ, ioaddr + RTC_FLAGS);
	second = readb(ioaddr + RTC_SECONDS) & RTC_SECONDS_MASK;
	minute = readb(ioaddr + RTC_MINUTES);
	hour = readb(ioaddr + RTC_HOURS);
	day = readb(ioaddr + RTC_DATE);
	week = readb(ioaddr + RTC_DAY) & RTC_DAY_MASK;
	month = readb(ioaddr + RTC_MONTH);
	year = readb(ioaddr + RTC_YEAR);
	century = readb(ioaddr + RTC_CENTURY);
	writeb(flags & ~RTC_READ, ioaddr + RTC_FLAGS);
	tm->tm_sec = bcd2bin(second);
	tm->tm_min = bcd2bin(minute);
	tm->tm_hour = bcd2bin(hour);
	tm->tm_mday = bcd2bin(day);
	tm->tm_wday = bcd2bin(week);
	tm->tm_mon = bcd2bin(month) - 1;
	/* year is 1900 + tm->tm_year */
	tm->tm_year = bcd2bin(year) + bcd2bin(century) * 100 - 1900;

	if (rtc_valid_tm(tm) < 0) {
		dev_err(dev, "retrieved date/time is not valid.\n");
		rtc_time_to_tm(0, tm);
	}
	return 0;
}

static void stk17ta8_rtc_update_alarm(struct rtc_plat_data *pdata)
{
	void __iomem *ioaddr = pdata->ioaddr;
	unsigned long irqflags;
	u8 flags;

	spin_lock_irqsave(&pdata->lock, irqflags);

	flags = readb(ioaddr + RTC_FLAGS);
	writeb(flags | RTC_WRITE, ioaddr + RTC_FLAGS);

	writeb(pdata->alrm_mday < 0 || (pdata->irqen & RTC_UF) ?
	       0x80 : bin2bcd(pdata->alrm_mday),
	       ioaddr + RTC_DATE_ALARM);
	writeb(pdata->alrm_hour < 0 || (pdata->irqen & RTC_UF) ?
	       0x80 : bin2bcd(pdata->alrm_hour),
	       ioaddr + RTC_HOURS_ALARM);
	writeb(pdata->alrm_min < 0 || (pdata->irqen & RTC_UF) ?
	       0x80 : bin2bcd(pdata->alrm_min),
	       ioaddr + RTC_MINUTES_ALARM);
	writeb(pdata->alrm_sec < 0 || (pdata->irqen & RTC_UF) ?
	       0x80 : bin2bcd(pdata->alrm_sec),
	       ioaddr + RTC_SECONDS_ALARM);
	writeb(pdata->irqen ? RTC_INTS_AIE : 0, ioaddr + RTC_INTERRUPTS);
	readb(ioaddr + RTC_FLAGS);	/* clear interrupts */
	writeb(flags & ~RTC_WRITE, ioaddr + RTC_FLAGS);
	spin_unlock_irqrestore(&pdata->lock, irqflags);
}

static int stk17ta8_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	if (pdata->irq <= 0)
		return -EINVAL;
	pdata->alrm_mday = alrm->time.tm_mday;
	pdata->alrm_hour = alrm->time.tm_hour;
	pdata->alrm_min = alrm->time.tm_min;
	pdata->alrm_sec = alrm->time.tm_sec;
	if (alrm->enabled)
		pdata->irqen |= RTC_AF;
	stk17ta8_rtc_update_alarm(pdata);
	return 0;
}

static int stk17ta8_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	if (pdata->irq <= 0)
		return -EINVAL;
	alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
	alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
	alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
	alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec;
	alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0;
	return 0;
}

static irqreturn_t stk17ta8_rtc_interrupt(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	unsigned long events = 0;

	spin_lock(&pdata->lock);
	/* read and clear interrupt */
	if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_AF) {
		events = RTC_IRQF;
		if (readb(ioaddr + RTC_SECONDS_ALARM) & 0x80)
			events |= RTC_UF;
		else
			events |= RTC_AF;
		if (likely(pdata->rtc))
			rtc_update_irq(pdata->rtc, 1, events);
	}
	spin_unlock(&pdata->lock);
	return events ? IRQ_HANDLED : IRQ_NONE;
}

static int stk17ta8_rtc_alarm_irq_enable(struct device *dev,
	unsigned int enabled)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	if (pdata->irq <= 0)
		return -EINVAL;
	if (enabled)
		pdata->irqen |= RTC_AF;
	else
		pdata->irqen &= ~RTC_AF;
	stk17ta8_rtc_update_alarm(pdata);
	return 0;
}

static const struct rtc_class_ops stk17ta8_rtc_ops = {
	.read_time		= stk17ta8_rtc_read_time,
	.set_time		= stk17ta8_rtc_set_time,
	.read_alarm		= stk17ta8_rtc_read_alarm,
	.set_alarm		= stk17ta8_rtc_set_alarm,
	.alarm_irq_enable	= stk17ta8_rtc_alarm_irq_enable,
};

static ssize_t stk17ta8_nvram_read(struct kobject *kobj,
				 struct bin_attribute *attr, char *buf,
				 loff_t pos, size_t size)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	ssize_t count;

	for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
		*buf++ = readb(ioaddr + pos++);
	return count;
}

static ssize_t stk17ta8_nvram_write(struct kobject *kobj,
				  struct bin_attribute *attr, char *buf,
				  loff_t pos, size_t size)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	ssize_t count;

	for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
		writeb(*buf++, ioaddr + pos++);
	return count;
}

static struct bin_attribute stk17ta8_nvram_attr = {
	.attr = {
		.name = "nvram",
		.mode = S_IRUGO | S_IWUSR,
	},
	.size = RTC_OFFSET,
	.read = stk17ta8_nvram_read,
	.write = stk17ta8_nvram_write,
};

static int __devinit stk17ta8_rtc_probe(struct platform_device *pdev)
{
	struct resource *res;
	unsigned int cal;
	unsigned int flags;
	struct rtc_plat_data *pdata;
	void __iomem *ioaddr;
	int ret = 0;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;
	if (!devm_request_mem_region(&pdev->dev, res->start, RTC_REG_SIZE,
			pdev->name))
		return -EBUSY;
	ioaddr = devm_ioremap(&pdev->dev, res->start, RTC_REG_SIZE);
	if (!ioaddr)
		return -ENOMEM;
	pdata->ioaddr = ioaddr;
	pdata->irq = platform_get_irq(pdev, 0);

	/* turn RTC on if it was not on */
	cal = readb(ioaddr + RTC_CALIBRATION);
	if (cal & RTC_STOP) {
		cal &= RTC_CAL_MASK;
		flags = readb(ioaddr + RTC_FLAGS);
		writeb(flags | RTC_WRITE, ioaddr + RTC_FLAGS);
		writeb(cal, ioaddr + RTC_CALIBRATION);
		writeb(flags & ~RTC_WRITE, ioaddr + RTC_FLAGS);
	}
	if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_PF)
		dev_warn(&pdev->dev, "voltage-low detected.\n");

	spin_lock_init(&pdata->lock);
	pdata->last_jiffies = jiffies;
	platform_set_drvdata(pdev, pdata);
	if (pdata->irq > 0) {
		writeb(0, ioaddr + RTC_INTERRUPTS);
		if (devm_request_irq(&pdev->dev, pdata->irq,
				stk17ta8_rtc_interrupt,
				IRQF_DISABLED | IRQF_SHARED,
				pdev->name, pdev) < 0) {
			dev_warn(&pdev->dev, "interrupt not available.\n");
			pdata->irq = 0;
		}
	}

	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
				  &stk17ta8_rtc_ops, THIS_MODULE);
	if (IS_ERR(pdata->rtc))
		return PTR_ERR(pdata->rtc);

	ret = sysfs_create_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
	if (ret)
		rtc_device_unregister(pdata->rtc);
	return ret;
}

static int __devexit stk17ta8_rtc_remove(struct platform_device *pdev)
{
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	sysfs_remove_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
	rtc_device_unregister(pdata->rtc);
	if (pdata->irq > 0)
		writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
	return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:stk17ta8");

static struct platform_driver stk17ta8_rtc_driver = {
	.probe		= stk17ta8_rtc_probe,
	.remove		= __devexit_p(stk17ta8_rtc_remove),
	.driver		= {
		.name	= "stk17ta8",
		.owner	= THIS_MODULE,
	},
};

static __init int stk17ta8_init(void)
{
	return platform_driver_register(&stk17ta8_rtc_driver);
}

static __exit void stk17ta8_exit(void)
{
	platform_driver_unregister(&stk17ta8_rtc_driver);
}

module_init(stk17ta8_init);
module_exit(stk17ta8_exit);

MODULE_AUTHOR("Thomas Hommel <thomas.hommel@gefanuc.com>");
MODULE_DESCRIPTION("Simtek STK17TA8 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
Commit	Line	Data
02964115 TH	1	/*
	2	* A RTC driver for the Simtek STK17TA8
	3	*
	4	* By Thomas Hommel <thomas.hommel@gefanuc.com>
	5	*
	6	* Based on the DS1553 driver from
	7	* Atsushi Nemoto <anemo@mba.ocn.ne.jp>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/bcd.h>
	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
5a0e3ad6	17	#include <linux/gfp.h>
02964115 TH	18	#include <linux/delay.h>
	19	#include <linux/jiffies.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/rtc.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/io.h>
	24
	25	#define DRV_VERSION "0.1"
	26
	27	#define RTC_REG_SIZE 0x20000
	28	#define RTC_OFFSET 0x1fff0
	29
	30	#define RTC_FLAGS (RTC_OFFSET + 0)
	31	#define RTC_CENTURY (RTC_OFFSET + 1)
	32	#define RTC_SECONDS_ALARM (RTC_OFFSET + 2)
	33	#define RTC_MINUTES_ALARM (RTC_OFFSET + 3)
	34	#define RTC_HOURS_ALARM (RTC_OFFSET + 4)
	35	#define RTC_DATE_ALARM (RTC_OFFSET + 5)
	36	#define RTC_INTERRUPTS (RTC_OFFSET + 6)
	37	#define RTC_WATCHDOG (RTC_OFFSET + 7)
	38	#define RTC_CALIBRATION (RTC_OFFSET + 8)
	39	#define RTC_SECONDS (RTC_OFFSET + 9)
	40	#define RTC_MINUTES (RTC_OFFSET + 10)
	41	#define RTC_HOURS (RTC_OFFSET + 11)
	42	#define RTC_DAY (RTC_OFFSET + 12)
	43	#define RTC_DATE (RTC_OFFSET + 13)
	44	#define RTC_MONTH (RTC_OFFSET + 14)
	45	#define RTC_YEAR (RTC_OFFSET + 15)
	46
	47	#define RTC_SECONDS_MASK 0x7f
	48	#define RTC_DAY_MASK 0x07
	49	#define RTC_CAL_MASK 0x3f
	50
	51	/* Bits in the Calibration register */
	52	#define RTC_STOP 0x80
	53
	54	/* Bits in the Flags register */
	55	#define RTC_FLAGS_AF 0x40
	56	#define RTC_FLAGS_PF 0x20
	57	#define RTC_WRITE 0x02
	58	#define RTC_READ 0x01
	59
	60	/* Bits in the Interrupts register */
	61	#define RTC_INTS_AIE 0x40
	62
	63	struct rtc_plat_data {
	64	struct rtc_device *rtc;
	65	void __iomem *ioaddr;
02964115 TH	66	unsigned long last_jiffies;
	67	int irq;
	68	unsigned int irqen;
	69	int alrm_sec;
	70	int alrm_min;
	71	int alrm_hour;
	72	int alrm_mday;
3151520d	73	spinlock_t lock;
02964115 TH	74	};
	75
	76	static int stk17ta8_rtc_set_time(struct device dev, struct rtc_time tm)
	77	{
	78	struct platform_device *pdev = to_platform_device(dev);
	79	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	80	void __iomem *ioaddr = pdata->ioaddr;
	81	u8 flags;
	82
	83	flags = readb(pdata->ioaddr + RTC_FLAGS);
	84	writeb(flags \| RTC_WRITE, pdata->ioaddr + RTC_FLAGS);
	85
fe20ba70 AB	86	writeb(bin2bcd(tm->tm_year % 100), ioaddr + RTC_YEAR);
	87	writeb(bin2bcd(tm->tm_mon + 1), ioaddr + RTC_MONTH);
	88	writeb(bin2bcd(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY);
	89	writeb(bin2bcd(tm->tm_mday), ioaddr + RTC_DATE);
	90	writeb(bin2bcd(tm->tm_hour), ioaddr + RTC_HOURS);
	91	writeb(bin2bcd(tm->tm_min), ioaddr + RTC_MINUTES);
	92	writeb(bin2bcd(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS);
	93	writeb(bin2bcd((tm->tm_year + 1900) / 100), ioaddr + RTC_CENTURY);
02964115 TH	94
	95	writeb(flags & ~RTC_WRITE, pdata->ioaddr + RTC_FLAGS);
	96	return 0;
	97	}
	98
	99	static int stk17ta8_rtc_read_time(struct device dev, struct rtc_time tm)
	100	{
	101	struct platform_device *pdev = to_platform_device(dev);
	102	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	103	void __iomem *ioaddr = pdata->ioaddr;
	104	unsigned int year, month, day, hour, minute, second, week;
	105	unsigned int century;
	106	u8 flags;
	107
	108	/* give enough time to update RTC in case of continuous read */
	109	if (pdata->last_jiffies == jiffies)
	110	msleep(1);
	111	pdata->last_jiffies = jiffies;
	112
	113	flags = readb(pdata->ioaddr + RTC_FLAGS);
	114	writeb(flags \| RTC_READ, ioaddr + RTC_FLAGS);
	115	second = readb(ioaddr + RTC_SECONDS) & RTC_SECONDS_MASK;
	116	minute = readb(ioaddr + RTC_MINUTES);
	117	hour = readb(ioaddr + RTC_HOURS);
	118	day = readb(ioaddr + RTC_DATE);
	119	week = readb(ioaddr + RTC_DAY) & RTC_DAY_MASK;
	120	month = readb(ioaddr + RTC_MONTH);
	121	year = readb(ioaddr + RTC_YEAR);
	122	century = readb(ioaddr + RTC_CENTURY);
	123	writeb(flags & ~RTC_READ, ioaddr + RTC_FLAGS);
fe20ba70 AB	124	tm->tm_sec = bcd2bin(second);
	125	tm->tm_min = bcd2bin(minute);
	126	tm->tm_hour = bcd2bin(hour);
	127	tm->tm_mday = bcd2bin(day);
	128	tm->tm_wday = bcd2bin(week);
	129	tm->tm_mon = bcd2bin(month) - 1;
02964115	130	/* year is 1900 + tm->tm_year */
fe20ba70	131	tm->tm_year = bcd2bin(year) + bcd2bin(century) * 100 - 1900;
02964115 TH	132
	133	if (rtc_valid_tm(tm) < 0) {
	134	dev_err(dev, "retrieved date/time is not valid.\n");
	135	rtc_time_to_tm(0, tm);
	136	}
	137	return 0;
	138	}
	139
	140	static void stk17ta8_rtc_update_alarm(struct rtc_plat_data *pdata)
	141	{
	142	void __iomem *ioaddr = pdata->ioaddr;
	143	unsigned long irqflags;
	144	u8 flags;
	145
3151520d	146	spin_lock_irqsave(&pdata->lock, irqflags);
02964115 TH	147
	148	flags = readb(ioaddr + RTC_FLAGS);
	149	writeb(flags \| RTC_WRITE, ioaddr + RTC_FLAGS);
	150
	151	writeb(pdata->alrm_mday < 0 \|\| (pdata->irqen & RTC_UF) ?
fe20ba70	152	0x80 : bin2bcd(pdata->alrm_mday),
02964115 TH	153	ioaddr + RTC_DATE_ALARM);
02964115 TH	154	writeb(pdata->alrm_hour < 0 \|\| (pdata->irqen & RTC_UF) ?
fe20ba70	155	0x80 : bin2bcd(pdata->alrm_hour),
02964115 TH	156	ioaddr + RTC_HOURS_ALARM);
02964115 TH	157	writeb(pdata->alrm_min < 0 \|\| (pdata->irqen & RTC_UF) ?
fe20ba70	158	0x80 : bin2bcd(pdata->alrm_min),
02964115 TH	159	ioaddr + RTC_MINUTES_ALARM);
02964115 TH	160	writeb(pdata->alrm_sec < 0 \|\| (pdata->irqen & RTC_UF) ?
fe20ba70	161	0x80 : bin2bcd(pdata->alrm_sec),
02964115 TH	162	ioaddr + RTC_SECONDS_ALARM);
	163	writeb(pdata->irqen ? RTC_INTS_AIE : 0, ioaddr + RTC_INTERRUPTS);
	164	readb(ioaddr + RTC_FLAGS); /* clear interrupts */
	165	writeb(flags & ~RTC_WRITE, ioaddr + RTC_FLAGS);
3151520d	166	spin_unlock_irqrestore(&pdata->lock, irqflags);
02964115 TH	167	}
	168
	169	static int stk17ta8_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	170	{
	171	struct platform_device *pdev = to_platform_device(dev);
	172	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	173
2fac6674	174	if (pdata->irq <= 0)
02964115 TH	175	return -EINVAL;
	176	pdata->alrm_mday = alrm->time.tm_mday;
	177	pdata->alrm_hour = alrm->time.tm_hour;
	178	pdata->alrm_min = alrm->time.tm_min;
	179	pdata->alrm_sec = alrm->time.tm_sec;
	180	if (alrm->enabled)
	181	pdata->irqen \|= RTC_AF;
	182	stk17ta8_rtc_update_alarm(pdata);
	183	return 0;
	184	}
	185
	186	static int stk17ta8_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	187	{
	188	struct platform_device *pdev = to_platform_device(dev);
	189	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	190
2fac6674	191	if (pdata->irq <= 0)
02964115 TH	192	return -EINVAL;
	193	alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
	194	alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
	195	alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
	196	alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec;
	197	alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0;
	198	return 0;
	199	}
	200
	201	static irqreturn_t stk17ta8_rtc_interrupt(int irq, void *dev_id)
	202	{
	203	struct platform_device *pdev = dev_id;
	204	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	205	void __iomem *ioaddr = pdata->ioaddr;
3151520d	206	unsigned long events = 0;
02964115	207
3151520d	208	spin_lock(&pdata->lock);
02964115	209	/* read and clear interrupt */
3151520d AN	210	if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_AF) {
	211	events = RTC_IRQF;
	212	if (readb(ioaddr + RTC_SECONDS_ALARM) & 0x80)
	213	events \|= RTC_UF;
	214	else
	215	events \|= RTC_AF;
	216	if (likely(pdata->rtc))
	217	rtc_update_irq(pdata->rtc, 1, events);
	218	}
	219	spin_unlock(&pdata->lock);
	220	return events ? IRQ_HANDLED : IRQ_NONE;
02964115 TH	221	}
02964115 TH	222
3151520d AN	223	static int stk17ta8_rtc_alarm_irq_enable(struct device *dev,
3151520d AN	224	unsigned int enabled)
02964115 TH	225	{
	226	struct platform_device *pdev = to_platform_device(dev);
	227	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	228
2fac6674	229	if (pdata->irq <= 0)
3151520d AN	230	return -EINVAL;
3151520d AN	231	if (enabled)
02964115	232	pdata->irqen \|= RTC_AF;
3151520d AN	233	else
	234	pdata->irqen &= ~RTC_AF;
	235	stk17ta8_rtc_update_alarm(pdata);
02964115 TH	236	return 0;
	237	}
	238
	239	static const struct rtc_class_ops stk17ta8_rtc_ops = {
3151520d AN	240	.read_time = stk17ta8_rtc_read_time,
	241	.set_time = stk17ta8_rtc_set_time,
	242	.read_alarm = stk17ta8_rtc_read_alarm,
	243	.set_alarm = stk17ta8_rtc_set_alarm,
	244	.alarm_irq_enable = stk17ta8_rtc_alarm_irq_enable,
02964115 TH	245	};
02964115 TH	246
c98dbe59 AV	247	static ssize_t stk17ta8_nvram_read(struct kobject *kobj,
c98dbe59 AV	248	struct bin_attribute attr, char buf,
02964115 TH	249	loff_t pos, size_t size)
02964115 TH	250	{
50e49bee AN	251	struct device *dev = container_of(kobj, struct device, kobj);
50e49bee AN	252	struct platform_device *pdev = to_platform_device(dev);
02964115 TH	253	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	254	void __iomem *ioaddr = pdata->ioaddr;
	255	ssize_t count;
	256
	257	for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
	258	*buf++ = readb(ioaddr + pos++);
	259	return count;
	260	}
	261
c98dbe59 AV	262	static ssize_t stk17ta8_nvram_write(struct kobject *kobj,
c98dbe59 AV	263	struct bin_attribute attr, char buf,
02964115 TH	264	loff_t pos, size_t size)
02964115 TH	265	{
50e49bee AN	266	struct device *dev = container_of(kobj, struct device, kobj);
50e49bee AN	267	struct platform_device *pdev = to_platform_device(dev);
02964115 TH	268	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	269	void __iomem *ioaddr = pdata->ioaddr;
	270	ssize_t count;
	271
	272	for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
	273	writeb(*buf++, ioaddr + pos++);
	274	return count;
	275	}
	276
	277	static struct bin_attribute stk17ta8_nvram_attr = {
	278	.attr = {
	279	.name = "nvram",
a4b1d50e	280	.mode = S_IRUGO \| S_IWUSR,
02964115 TH	281	},
	282	.size = RTC_OFFSET,
	283	.read = stk17ta8_nvram_read,
	284	.write = stk17ta8_nvram_write,
	285	};
	286
81e627e0	287	static int __devinit stk17ta8_rtc_probe(struct platform_device *pdev)
02964115	288	{
02964115 TH	289	struct resource *res;
	290	unsigned int cal;
	291	unsigned int flags;
	292	struct rtc_plat_data *pdata;
3151520d	293	void __iomem *ioaddr;
02964115 TH	294	int ret = 0;
	295
	296	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	297	if (!res)
	298	return -ENODEV;
	299
3151520d	300	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
02964115 TH	301	if (!pdata)
02964115 TH	302	return -ENOMEM;
3151520d AN	303	if (!devm_request_mem_region(&pdev->dev, res->start, RTC_REG_SIZE,
	304	pdev->name))
	305	return -EBUSY;
	306	ioaddr = devm_ioremap(&pdev->dev, res->start, RTC_REG_SIZE);
	307	if (!ioaddr)
	308	return -ENOMEM;
02964115 TH	309	pdata->ioaddr = ioaddr;
	310	pdata->irq = platform_get_irq(pdev, 0);
	311
	312	/* turn RTC on if it was not on */
	313	cal = readb(ioaddr + RTC_CALIBRATION);
	314	if (cal & RTC_STOP) {
	315	cal &= RTC_CAL_MASK;
	316	flags = readb(ioaddr + RTC_FLAGS);
	317	writeb(flags \| RTC_WRITE, ioaddr + RTC_FLAGS);
	318	writeb(cal, ioaddr + RTC_CALIBRATION);
	319	writeb(flags & ~RTC_WRITE, ioaddr + RTC_FLAGS);
	320	}
	321	if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_PF)
	322	dev_warn(&pdev->dev, "voltage-low detected.\n");
	323
3151520d AN	324	spin_lock_init(&pdata->lock);
	325	pdata->last_jiffies = jiffies;
	326	platform_set_drvdata(pdev, pdata);
2fac6674	327	if (pdata->irq > 0) {
02964115	328	writeb(0, ioaddr + RTC_INTERRUPTS);
3151520d AN	329	if (devm_request_irq(&pdev->dev, pdata->irq,
3151520d AN	330	stk17ta8_rtc_interrupt,
02964115 TH	331	IRQF_DISABLED \| IRQF_SHARED,
	332	pdev->name, pdev) < 0) {
	333	dev_warn(&pdev->dev, "interrupt not available.\n");
2fac6674	334	pdata->irq = 0;
02964115 TH	335	}
	336	}
	337
b74d2caa	338	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
02964115	339	&stk17ta8_rtc_ops, THIS_MODULE);
3151520d AN	340	if (IS_ERR(pdata->rtc))
3151520d AN	341	return PTR_ERR(pdata->rtc);
b74d2caa	342
02964115	343	ret = sysfs_create_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
3151520d	344	if (ret)
b74d2caa	345	rtc_device_unregister(pdata->rtc);
02964115 TH	346	return ret;
	347	}
	348
	349	static int __devexit stk17ta8_rtc_remove(struct platform_device *pdev)
	350	{
	351	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	352
	353	sysfs_remove_bin_file(&pdev->dev.kobj, &stk17ta8_nvram_attr);
	354	rtc_device_unregister(pdata->rtc);
3151520d	355	if (pdata->irq > 0)
02964115	356	writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
02964115 TH	357	return 0;
	358	}
	359
ad28a07b KS	360	/* work with hotplug and coldplug */
	361	MODULE_ALIAS("platform:stk17ta8");
	362
02964115 TH	363	static struct platform_driver stk17ta8_rtc_driver = {
	364	.probe = stk17ta8_rtc_probe,
	365	.remove = __devexit_p(stk17ta8_rtc_remove),
	366	.driver = {
	367	.name = "stk17ta8",
	368	.owner = THIS_MODULE,
	369	},
	370	};
	371
	372	static __init int stk17ta8_init(void)
	373	{
	374	return platform_driver_register(&stk17ta8_rtc_driver);
	375	}
	376
	377	static __exit void stk17ta8_exit(void)
	378	{
277835ad	379	platform_driver_unregister(&stk17ta8_rtc_driver);
02964115 TH	380	}
	381
	382	module_init(stk17ta8_init);
	383	module_exit(stk17ta8_exit);
	384
	385	MODULE_AUTHOR("Thomas Hommel <thomas.hommel@gefanuc.com>");
	386	MODULE_DESCRIPTION("Simtek STK17TA8 RTC driver");
	387	MODULE_LICENSE("GPL");
	388	MODULE_VERSION(DRV_VERSION);