[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / rtc / rtc-ds1553.c

/*
 * An rtc driver for the Dallas DS1553
 *
 * Copyright (C) 2006 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/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		0x2000
#define RTC_OFFSET		0x1ff0

#define RTC_FLAGS		(RTC_OFFSET + 0)
#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_CONTROL		(RTC_OFFSET + 8)
#define RTC_CENTURY		(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_CENTURY_MASK	0x3f
#define RTC_SECONDS_MASK	0x7f
#define RTC_DAY_MASK		0x07

/* Bits in the Control/Century register */
#define RTC_WRITE		0x80
#define RTC_READ		0x40

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

/* Bits in the Flags register */
#define RTC_FLAGS_AF		0x40
#define RTC_FLAGS_BLF		0x10

/* Bits in the Interrupts register */
#define RTC_INTS_AE		0x80

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

static int ds1553_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 century;

	century = BIN2BCD((tm->tm_year + 1900) / 100);

	writeb(RTC_WRITE, pdata->ioaddr + RTC_CONTROL);

	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);

	/* RTC_CENTURY and RTC_CONTROL share same register */
	writeb(RTC_WRITE | (century & RTC_CENTURY_MASK), ioaddr + RTC_CENTURY);
	writeb(century & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL);
	return 0;
}

static int ds1553_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;

	/* give enough time to update RTC in case of continuous read */
	if (pdata->last_jiffies == jiffies)
		msleep(1);
	pdata->last_jiffies = jiffies;
	writeb(RTC_READ, ioaddr + RTC_CONTROL);
	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) & RTC_CENTURY_MASK;
	writeb(0, ioaddr + RTC_CONTROL);
	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 ds1553_rtc_update_alarm(struct rtc_plat_data *pdata)
{
	void __iomem *ioaddr = pdata->ioaddr;
	unsigned long flags;

	spin_lock_irqsave(&pdata->rtc->irq_lock, 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_AE : 0, ioaddr + RTC_INTERRUPTS);
	readb(ioaddr + RTC_FLAGS);	/* clear interrupts */
	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);
}

static int ds1553_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;
	ds1553_rtc_update_alarm(pdata);
	return 0;
}

static int ds1553_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 ds1553_rtc_interrupt(int irq, void *dev_id,
					struct pt_regs *regs)
{
	struct platform_device *pdev = dev_id;
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;
	unsigned long events = RTC_IRQF;

	/* read and clear interrupt */
	if (!(readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_AF))
		return IRQ_NONE;
	if (readb(ioaddr + RTC_SECONDS_ALARM) & 0x80)
		events |= RTC_UF;
	else
		events |= RTC_AF;
	rtc_update_irq(&pdata->rtc->class_dev, 1, events);
	return IRQ_HANDLED;
}

static void ds1553_rtc_release(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	if (pdata->irq >= 0) {
		pdata->irqen = 0;
		ds1553_rtc_update_alarm(pdata);
	}
}

static int ds1553_rtc_ioctl(struct device *dev, unsigned int cmd,
			    unsigned long arg)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	if (pdata->irq < 0)
		return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
	switch (cmd) {
	case RTC_AIE_OFF:
		pdata->irqen &= ~RTC_AF;
		ds1553_rtc_update_alarm(pdata);
		break;
	case RTC_AIE_ON:
		pdata->irqen |= RTC_AF;
		ds1553_rtc_update_alarm(pdata);
		break;
	case RTC_UIE_OFF:
		pdata->irqen &= ~RTC_UF;
		ds1553_rtc_update_alarm(pdata);
		break;
	case RTC_UIE_ON:
		pdata->irqen |= RTC_UF;
		ds1553_rtc_update_alarm(pdata);
		break;
	default:
		return -ENOIOCTLCMD;
	}
	return 0;
}

static const struct rtc_class_ops ds1553_rtc_ops = {
	.read_time	= ds1553_rtc_read_time,
	.set_time	= ds1553_rtc_set_time,
	.read_alarm	= ds1553_rtc_read_alarm,
	.set_alarm	= ds1553_rtc_set_alarm,
	.release	= ds1553_rtc_release,
	.ioctl		= ds1553_rtc_ioctl,
};

static ssize_t ds1553_nvram_read(struct kobject *kobj, char *buf,
				 loff_t pos, size_t size)
{
	struct platform_device *pdev =
		to_platform_device(container_of(kobj, struct device, kobj));
	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 ds1553_nvram_write(struct kobject *kobj, char *buf,
				  loff_t pos, size_t size)
{
	struct platform_device *pdev =
		to_platform_device(container_of(kobj, struct device, kobj));
	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 ds1553_nvram_attr = {
	.attr = {
		.name = "nvram",
		.mode = S_IRUGO | S_IWUGO,
		.owner = THIS_MODULE,
	},
	.size = RTC_OFFSET,
	.read = ds1553_nvram_read,
	.write = ds1553_nvram_write,
};

static int __init ds1553_rtc_probe(struct platform_device *pdev)
{
	struct rtc_device *rtc;
	struct resource *res;
	unsigned int cen, sec;
	struct rtc_plat_data *pdata = NULL;
	void __iomem *ioaddr = NULL;
	int ret = 0;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;
	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;
	pdata->irq = -1;
	if (!request_mem_region(res->start, RTC_REG_SIZE, pdev->name)) {
		ret = -EBUSY;
		goto out;
	}
	pdata->baseaddr = res->start;
	ioaddr = ioremap(pdata->baseaddr, RTC_REG_SIZE);
	if (!ioaddr) {
		ret = -ENOMEM;
		goto out;
	}
	pdata->ioaddr = ioaddr;
	pdata->irq = platform_get_irq(pdev, 0);

	/* turn RTC on if it was not on */
	sec = readb(ioaddr + RTC_SECONDS);
	if (sec & RTC_STOP) {
		sec &= RTC_SECONDS_MASK;
		cen = readb(ioaddr + RTC_CENTURY) & RTC_CENTURY_MASK;
		writeb(RTC_WRITE, ioaddr + RTC_CONTROL);
		writeb(sec, ioaddr + RTC_SECONDS);
		writeb(cen & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL);
	}
	if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_BLF)
		dev_warn(&pdev->dev, "voltage-low detected.\n");

	if (pdata->irq >= 0) {
		writeb(0, ioaddr + RTC_INTERRUPTS);
		if (request_irq(pdata->irq, ds1553_rtc_interrupt, IRQF_SHARED,
				pdev->name, pdev) < 0) {
			dev_warn(&pdev->dev, "interrupt not available.\n");
			pdata->irq = -1;
		}
	}

	rtc = rtc_device_register(pdev->name, &pdev->dev,
				  &ds1553_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc)) {
		ret = PTR_ERR(rtc);
		goto out;
	}
	pdata->rtc = rtc;
	pdata->last_jiffies = jiffies;
	platform_set_drvdata(pdev, pdata);
	sysfs_create_bin_file(&pdev->dev.kobj, &ds1553_nvram_attr);
	return 0;
 out:
	if (pdata->irq >= 0)
		free_irq(pdata->irq, pdev);
	if (ioaddr)
		iounmap(ioaddr);
	if (pdata->baseaddr)
		release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
	kfree(pdata);
	return ret;
}

static int __devexit ds1553_rtc_remove(struct platform_device *pdev)
{
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	sysfs_remove_bin_file(&pdev->dev.kobj, &ds1553_nvram_attr);
	rtc_device_unregister(pdata->rtc);
	if (pdata->irq >= 0) {
		writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
		free_irq(pdata->irq, pdev);
	}
	iounmap(pdata->ioaddr);
	release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
	kfree(pdata);
	return 0;
}

static struct platform_driver ds1553_rtc_driver = {
	.probe		= ds1553_rtc_probe,
	.remove		= __devexit_p(ds1553_rtc_remove),
	.driver		= {
		.name	= "ds1553",
		.owner	= THIS_MODULE,
	},
};

static __init int ds1553_init(void)
{
	return platform_driver_register(&ds1553_rtc_driver);
}

static __exit void ds1553_exit(void)
{
	return platform_driver_unregister(&ds1553_rtc_driver);
}

module_init(ds1553_init);
module_exit(ds1553_exit);

MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
MODULE_DESCRIPTION("Dallas DS1553 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
Commit	Line	Data
9bf5b4f5 AN	1	/*
	2	* An rtc driver for the Dallas DS1553
	3	*
	4	* Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/bcd.h>
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/delay.h>
	15	#include <linux/jiffies.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/rtc.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/io.h>
	20
	21	#define DRV_VERSION "0.1"
	22
	23	#define RTC_REG_SIZE 0x2000
	24	#define RTC_OFFSET 0x1ff0
	25
	26	#define RTC_FLAGS (RTC_OFFSET + 0)
	27	#define RTC_SECONDS_ALARM (RTC_OFFSET + 2)
	28	#define RTC_MINUTES_ALARM (RTC_OFFSET + 3)
	29	#define RTC_HOURS_ALARM (RTC_OFFSET + 4)
	30	#define RTC_DATE_ALARM (RTC_OFFSET + 5)
	31	#define RTC_INTERRUPTS (RTC_OFFSET + 6)
	32	#define RTC_WATCHDOG (RTC_OFFSET + 7)
	33	#define RTC_CONTROL (RTC_OFFSET + 8)
	34	#define RTC_CENTURY (RTC_OFFSET + 8)
	35	#define RTC_SECONDS (RTC_OFFSET + 9)
	36	#define RTC_MINUTES (RTC_OFFSET + 10)
	37	#define RTC_HOURS (RTC_OFFSET + 11)
	38	#define RTC_DAY (RTC_OFFSET + 12)
	39	#define RTC_DATE (RTC_OFFSET + 13)
	40	#define RTC_MONTH (RTC_OFFSET + 14)
	41	#define RTC_YEAR (RTC_OFFSET + 15)
	42
	43	#define RTC_CENTURY_MASK 0x3f
	44	#define RTC_SECONDS_MASK 0x7f
	45	#define RTC_DAY_MASK 0x07
	46
	47	/* Bits in the Control/Century register */
	48	#define RTC_WRITE 0x80
	49	#define RTC_READ 0x40
	50
	51	/* Bits in the Seconds register */
	52	#define RTC_STOP 0x80
	53
	54	/* Bits in the Flags register */
	55	#define RTC_FLAGS_AF 0x40
	56	#define RTC_FLAGS_BLF 0x10
	57
	58	/* Bits in the Interrupts register */
	59	#define RTC_INTS_AE 0x80
	60
	61	struct rtc_plat_data {
	62	struct rtc_device *rtc;
	63	void __iomem *ioaddr;
	64	unsigned long baseaddr;
65	unsigned long last_jiffies;
66	int irq;
67	unsigned int irqen;
68	int alrm_sec;
69	int alrm_min;
70	int alrm_hour;
71	int alrm_mday;
72	};
73
74	static int ds1553_rtc_set_time(struct device dev, struct rtc_time tm)
75	{
76	struct platform_device *pdev = to_platform_device(dev);
77	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
78	void __iomem *ioaddr = pdata->ioaddr;
79	u8 century;
80
81	century = BIN2BCD((tm->tm_year + 1900) / 100);
82
83	writeb(RTC_WRITE, pdata->ioaddr + RTC_CONTROL);
84
85	writeb(BIN2BCD(tm->tm_year % 100), ioaddr + RTC_YEAR);
86	writeb(BIN2BCD(tm->tm_mon + 1), ioaddr + RTC_MONTH);
87	writeb(BIN2BCD(tm->tm_wday) & RTC_DAY_MASK, ioaddr + RTC_DAY);
88	writeb(BIN2BCD(tm->tm_mday), ioaddr + RTC_DATE);
89	writeb(BIN2BCD(tm->tm_hour), ioaddr + RTC_HOURS);
90	writeb(BIN2BCD(tm->tm_min), ioaddr + RTC_MINUTES);
91	writeb(BIN2BCD(tm->tm_sec) & RTC_SECONDS_MASK, ioaddr + RTC_SECONDS);
92
93	/* RTC_CENTURY and RTC_CONTROL share same register */
94	writeb(RTC_WRITE \| (century & RTC_CENTURY_MASK), ioaddr + RTC_CENTURY);
95	writeb(century & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL);
96	return 0;
97	}
98
99	static int ds1553_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
107	/* give enough time to update RTC in case of continuous read */
108	if (pdata->last_jiffies == jiffies)
109	msleep(1);
110	pdata->last_jiffies = jiffies;
111	writeb(RTC_READ, ioaddr + RTC_CONTROL);
112	second = readb(ioaddr + RTC_SECONDS) & RTC_SECONDS_MASK;
113	minute = readb(ioaddr + RTC_MINUTES);
114	hour = readb(ioaddr + RTC_HOURS);
115	day = readb(ioaddr + RTC_DATE);
116	week = readb(ioaddr + RTC_DAY) & RTC_DAY_MASK;
117	month = readb(ioaddr + RTC_MONTH);
118	year = readb(ioaddr + RTC_YEAR);
119	century = readb(ioaddr + RTC_CENTURY) & RTC_CENTURY_MASK;
120	writeb(0, ioaddr + RTC_CONTROL);
121	tm->tm_sec = BCD2BIN(second);
122	tm->tm_min = BCD2BIN(minute);
123	tm->tm_hour = BCD2BIN(hour);
124	tm->tm_mday = BCD2BIN(day);
125	tm->tm_wday = BCD2BIN(week);
126	tm->tm_mon = BCD2BIN(month) - 1;
127	/* year is 1900 + tm->tm_year */
128	tm->tm_year = BCD2BIN(year) + BCD2BIN(century) * 100 - 1900;
129
130	if (rtc_valid_tm(tm) < 0) {
131	dev_err(dev, "retrieved date/time is not valid.\n");
132	rtc_time_to_tm(0, tm);
133	}
134	return 0;
135	}
136
137	static void ds1553_rtc_update_alarm(struct rtc_plat_data *pdata)
138	{
139	void __iomem *ioaddr = pdata->ioaddr;
140	unsigned long flags;
141
142	spin_lock_irqsave(&pdata->rtc->irq_lock, flags);
143	writeb(pdata->alrm_mday < 0 \|\| (pdata->irqen & RTC_UF) ?
144	0x80 : BIN2BCD(pdata->alrm_mday),
145	ioaddr + RTC_DATE_ALARM);
146	writeb(pdata->alrm_hour < 0 \|\| (pdata->irqen & RTC_UF) ?
147	0x80 : BIN2BCD(pdata->alrm_hour),
148	ioaddr + RTC_HOURS_ALARM);
149	writeb(pdata->alrm_min < 0 \|\| (pdata->irqen & RTC_UF) ?
150	0x80 : BIN2BCD(pdata->alrm_min),
151	ioaddr + RTC_MINUTES_ALARM);
152	writeb(pdata->alrm_sec < 0 \|\| (pdata->irqen & RTC_UF) ?
153	0x80 : BIN2BCD(pdata->alrm_sec),
154	ioaddr + RTC_SECONDS_ALARM);
155	writeb(pdata->irqen ? RTC_INTS_AE : 0, ioaddr + RTC_INTERRUPTS);
156	readb(ioaddr + RTC_FLAGS); /* clear interrupts */
157	spin_unlock_irqrestore(&pdata->rtc->irq_lock, flags);
158	}
159
160	static int ds1553_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
161	{
162	struct platform_device *pdev = to_platform_device(dev);
163	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
164
165	if (pdata->irq < 0)
166	return -EINVAL;
167	pdata->alrm_mday = alrm->time.tm_mday;
168	pdata->alrm_hour = alrm->time.tm_hour;
169	pdata->alrm_min = alrm->time.tm_min;
170	pdata->alrm_sec = alrm->time.tm_sec;
171	if (alrm->enabled)
172	pdata->irqen \|= RTC_AF;
173	ds1553_rtc_update_alarm(pdata);
174	return 0;
175	}
176
177	static int ds1553_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
178	{
179	struct platform_device *pdev = to_platform_device(dev);
180	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
181
182	if (pdata->irq < 0)
183	return -EINVAL;
184	alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
185	alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
186	alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
187	alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec;
188	alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0;
189	return 0;
190	}
191
192	static irqreturn_t ds1553_rtc_interrupt(int irq, void *dev_id,
193	struct pt_regs *regs)
194	{
195	struct platform_device *pdev = dev_id;
196	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
197	void __iomem *ioaddr = pdata->ioaddr;
198	unsigned long events = RTC_IRQF;
199
200	/* read and clear interrupt */
201	if (!(readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_AF))
202	return IRQ_NONE;
203	if (readb(ioaddr + RTC_SECONDS_ALARM) & 0x80)
204	events \|= RTC_UF;
205	else
206	events \|= RTC_AF;
207	rtc_update_irq(&pdata->rtc->class_dev, 1, events);
208	return IRQ_HANDLED;
209	}
210
211	static void ds1553_rtc_release(struct device *dev)
212	{
213	struct platform_device *pdev = to_platform_device(dev);
214	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
215
216	if (pdata->irq >= 0) {
217	pdata->irqen = 0;
218	ds1553_rtc_update_alarm(pdata);
219	}
220	}
221
222	static int ds1553_rtc_ioctl(struct device *dev, unsigned int cmd,
223	unsigned long arg)
224	{
225	struct platform_device *pdev = to_platform_device(dev);
226	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
227
228	if (pdata->irq < 0)
0ca06664	229	return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
9bf5b4f5 AN	230	switch (cmd) {
	231	case RTC_AIE_OFF:
	232	pdata->irqen &= ~RTC_AF;
	233	ds1553_rtc_update_alarm(pdata);
	234	break;
	235	case RTC_AIE_ON:
	236	pdata->irqen \|= RTC_AF;
	237	ds1553_rtc_update_alarm(pdata);
	238	break;
	239	case RTC_UIE_OFF:
	240	pdata->irqen &= ~RTC_UF;
	241	ds1553_rtc_update_alarm(pdata);
	242	break;
	243	case RTC_UIE_ON:
	244	pdata->irqen \|= RTC_UF;
	245	ds1553_rtc_update_alarm(pdata);
	246	break;
	247	default:
	248	return -ENOIOCTLCMD;
	249	}
	250	return 0;
	251	}
	252
ff8371ac	253	static const struct rtc_class_ops ds1553_rtc_ops = {
9bf5b4f5 AN	254	.read_time = ds1553_rtc_read_time,
	255	.set_time = ds1553_rtc_set_time,
	256	.read_alarm = ds1553_rtc_read_alarm,
	257	.set_alarm = ds1553_rtc_set_alarm,
	258	.release = ds1553_rtc_release,
	259	.ioctl = ds1553_rtc_ioctl,
	260	};
	261
	262	static ssize_t ds1553_nvram_read(struct kobject kobj, char buf,
	263	loff_t pos, size_t size)
	264	{
	265	struct platform_device *pdev =
	266	to_platform_device(container_of(kobj, struct device, kobj));
	267	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	268	void __iomem *ioaddr = pdata->ioaddr;
	269	ssize_t count;
	270
	271	for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
	272	*buf++ = readb(ioaddr + pos++);
	273	return count;
	274	}
	275
	276	static ssize_t ds1553_nvram_write(struct kobject kobj, char buf,
	277	loff_t pos, size_t size)
	278	{
	279	struct platform_device *pdev =
	280	to_platform_device(container_of(kobj, struct device, kobj));
	281	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	282	void __iomem *ioaddr = pdata->ioaddr;
	283	ssize_t count;
	284
	285	for (count = 0; size > 0 && pos < RTC_OFFSET; count++, size--)
	286	writeb(*buf++, ioaddr + pos++);
	287	return count;
	288	}
	289
	290	static struct bin_attribute ds1553_nvram_attr = {
	291	.attr = {
	292	.name = "nvram",
	293	.mode = S_IRUGO \| S_IWUGO,
	294	.owner = THIS_MODULE,
	295	},
	296	.size = RTC_OFFSET,
	297	.read = ds1553_nvram_read,
	298	.write = ds1553_nvram_write,
	299	};
	300
	301	static int __init ds1553_rtc_probe(struct platform_device *pdev)
	302	{
	303	struct rtc_device *rtc;
	304	struct resource *res;
	305	unsigned int cen, sec;
	306	struct rtc_plat_data *pdata = NULL;
	307	void __iomem *ioaddr = NULL;
	308	int ret = 0;
	309
	310	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	311	if (!res)
	312	return -ENODEV;
	313	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	314	if (!pdata)
	315	return -ENOMEM;
	316	pdata->irq = -1;
	317	if (!request_mem_region(res->start, RTC_REG_SIZE, pdev->name)) {
318	ret = -EBUSY;
319	goto out;
320	}
321	pdata->baseaddr = res->start;
322	ioaddr = ioremap(pdata->baseaddr, RTC_REG_SIZE);
323	if (!ioaddr) {
324	ret = -ENOMEM;
325	goto out;
326	}
327	pdata->ioaddr = ioaddr;
328	pdata->irq = platform_get_irq(pdev, 0);
329
330	/* turn RTC on if it was not on */
331	sec = readb(ioaddr + RTC_SECONDS);
332	if (sec & RTC_STOP) {
333	sec &= RTC_SECONDS_MASK;
334	cen = readb(ioaddr + RTC_CENTURY) & RTC_CENTURY_MASK;
335	writeb(RTC_WRITE, ioaddr + RTC_CONTROL);
336	writeb(sec, ioaddr + RTC_SECONDS);
337	writeb(cen & RTC_CENTURY_MASK, ioaddr + RTC_CONTROL);
338	}
339	if (readb(ioaddr + RTC_FLAGS) & RTC_FLAGS_BLF)
340	dev_warn(&pdev->dev, "voltage-low detected.\n");
341
342	if (pdata->irq >= 0) {
343	writeb(0, ioaddr + RTC_INTERRUPTS);
dace1453	344	if (request_irq(pdata->irq, ds1553_rtc_interrupt, IRQF_SHARED,
9bf5b4f5 AN	345	pdev->name, pdev) < 0) {
	346	dev_warn(&pdev->dev, "interrupt not available.\n");
	347	pdata->irq = -1;
	348	}
	349	}
	350
	351	rtc = rtc_device_register(pdev->name, &pdev->dev,
	352	&ds1553_rtc_ops, THIS_MODULE);
	353	if (IS_ERR(rtc)) {
	354	ret = PTR_ERR(rtc);
	355	goto out;
	356	}
	357	pdata->rtc = rtc;
	358	pdata->last_jiffies = jiffies;
	359	platform_set_drvdata(pdev, pdata);
	360	sysfs_create_bin_file(&pdev->dev.kobj, &ds1553_nvram_attr);
	361	return 0;
	362	out:
	363	if (pdata->irq >= 0)
	364	free_irq(pdata->irq, pdev);
	365	if (ioaddr)
	366	iounmap(ioaddr);
	367	if (pdata->baseaddr)
	368	release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
	369	kfree(pdata);
	370	return ret;
	371	}
	372
	373	static int __devexit ds1553_rtc_remove(struct platform_device *pdev)
	374	{
	375	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	376
	377	sysfs_remove_bin_file(&pdev->dev.kobj, &ds1553_nvram_attr);
	378	rtc_device_unregister(pdata->rtc);
	379	if (pdata->irq >= 0) {
	380	writeb(0, pdata->ioaddr + RTC_INTERRUPTS);
	381	free_irq(pdata->irq, pdev);
	382	}
	383	iounmap(pdata->ioaddr);
	384	release_mem_region(pdata->baseaddr, RTC_REG_SIZE);
	385	kfree(pdata);
	386	return 0;
	387	}
	388
	389	static struct platform_driver ds1553_rtc_driver = {
	390	.probe = ds1553_rtc_probe,
	391	.remove = __devexit_p(ds1553_rtc_remove),
	392	.driver = {
	393	.name = "ds1553",
	394	.owner = THIS_MODULE,
	395	},
	396	};
	397
	398	static __init int ds1553_init(void)
	399	{
	400	return platform_driver_register(&ds1553_rtc_driver);
	401	}
	402
	403	static __exit void ds1553_exit(void)
	404	{
	405	return platform_driver_unregister(&ds1553_rtc_driver);
	406	}
	407
	408	module_init(ds1553_init);
409	module_exit(ds1553_exit);
410
411	MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
412	MODULE_DESCRIPTION("Dallas DS1553 RTC driver");
413	MODULE_LICENSE("GPL");
414	MODULE_VERSION(DRV_VERSION);