Release 4.7 drivers/rtc/rtc-ds1511.c

/*
 * An rtc driver for the Dallas DS1511
 *
 * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
 * Copyright (C) 2007 Andrew Sharp <andy.sharp@lsi.com>
 *
 * 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.
 *
 * Real time clock driver for the Dallas 1511 chip, which also
 * contains a watchdog timer.  There is a tiny amount of code that
 * platform code could use to mess with the watchdog device a little
 * bit, but not a full watchdog driver.
 */

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


enum ds1511reg {
	
DS1511_SEC = 0x0,
	
DS1511_MIN = 0x1,
	
DS1511_HOUR = 0x2,
	
DS1511_DOW = 0x3,
	
DS1511_DOM = 0x4,
	
DS1511_MONTH = 0x5,
	
DS1511_YEAR = 0x6,
	
DS1511_CENTURY = 0x7,
	
DS1511_AM1_SEC = 0x8,
	
DS1511_AM2_MIN = 0x9,
	
DS1511_AM3_HOUR = 0xa,
	
DS1511_AM4_DATE = 0xb,
	
DS1511_WD_MSEC = 0xc,
	
DS1511_WD_SEC = 0xd,
	
DS1511_CONTROL_A = 0xe,
	
DS1511_CONTROL_B = 0xf,
	
DS1511_RAMADDR_LSB = 0x10,
	
DS1511_RAMDATA = 0x13
};


#define DS1511_BLF1	0x80

#define DS1511_BLF2	0x40

#define DS1511_PRS	0x20

#define DS1511_PAB	0x10

#define DS1511_TDF	0x08

#define DS1511_KSF	0x04

#define DS1511_WDF	0x02

#define DS1511_IRQF	0x01

#define DS1511_TE	0x80

#define DS1511_CS	0x40

#define DS1511_BME	0x20

#define DS1511_TPE	0x10

#define DS1511_TIE	0x08

#define DS1511_KIE	0x04

#define DS1511_WDE	0x02

#define DS1511_WDS	0x01

#define DS1511_RAM_MAX	0x100


#define RTC_CMD		DS1511_CONTROL_B

#define RTC_CMD1	DS1511_CONTROL_A


#define RTC_ALARM_SEC	DS1511_AM1_SEC

#define RTC_ALARM_MIN	DS1511_AM2_MIN

#define RTC_ALARM_HOUR	DS1511_AM3_HOUR

#define RTC_ALARM_DATE	DS1511_AM4_DATE


#define RTC_SEC		DS1511_SEC

#define RTC_MIN		DS1511_MIN

#define RTC_HOUR	DS1511_HOUR

#define RTC_DOW		DS1511_DOW

#define RTC_DOM		DS1511_DOM

#define RTC_MON		DS1511_MONTH

#define RTC_YEAR	DS1511_YEAR

#define RTC_CENTURY	DS1511_CENTURY


#define RTC_TIE	DS1511_TIE

#define RTC_TE	DS1511_TE


struct rtc_plat_data {
	
struct rtc_device *rtc;
	
void __iomem *ioaddr;		/* virtual base address */
	
int irq;
	
unsigned int irqen;
	
int alrm_sec;
	
int alrm_min;
	
int alrm_hour;
	
int alrm_mday;
	
spinlock_t lock;
};

static DEFINE_SPINLOCK(ds1511_lock);


static __iomem char *ds1511_base;

static u32 reg_spacing = 1;


static noinline void

rtc_write(uint8_t val, uint32_t reg)
{
	writeb(val, ds1511_base + (reg * reg_spacing));
}

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static inline void

rtc_write_alarm(uint8_t val, enum ds1511reg reg)
{
	rtc_write((val | 0x80), reg);
}

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static noinline uint8_t

rtc_read(enum ds1511reg reg)
{
	return readb(ds1511_base + (reg * reg_spacing));
}

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static inline void

rtc_disable_update(void)
{
	rtc_write((rtc_read(RTC_CMD) & ~RTC_TE), RTC_CMD);
}

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static void

rtc_enable_update(void)
{
	rtc_write((rtc_read(RTC_CMD) | RTC_TE), RTC_CMD);
}

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/*
 * #define DS1511_WDOG_RESET_SUPPORT
 *
 * Uncomment this if you want to use these routines in
 * some platform code.
 */
#ifdef DS1511_WDOG_RESET_SUPPORT
/*
 * just enough code to set the watchdog timer so that it
 * will reboot the system
 */

void

ds1511_wdog_set(unsigned long deciseconds)
{
	/*
         * the wdog timer can take 99.99 seconds
         */
	deciseconds %= 10000;
	/*
         * set the wdog values in the wdog registers
         */
	rtc_write(bin2bcd(deciseconds % 100), DS1511_WD_MSEC);
	rtc_write(bin2bcd(deciseconds / 100), DS1511_WD_SEC);
	/*
         * set wdog enable and wdog 'steering' bit to issue a reset
         */
	rtc_write(rtc_read(RTC_CMD) | DS1511_WDE | DS1511_WDS, RTC_CMD);
}

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void

ds1511_wdog_disable(void)
{
	/*
         * clear wdog enable and wdog 'steering' bits
         */
	rtc_write(rtc_read(RTC_CMD) & ~(DS1511_WDE | DS1511_WDS), RTC_CMD);
	/*
         * clear the wdog counter
         */
	rtc_write(0, DS1511_WD_MSEC);
	rtc_write(0, DS1511_WD_SEC);
}
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#endif

/*
 * set the rtc chip's idea of the time.
 * stupidly, some callers call with year unmolested;
 * and some call with  year = year - 1900.  thanks.
 */


static int ds1511_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm)
{
	u8 mon, day, dow, hrs, min, sec, yrs, cen;
	unsigned long flags;

	/*
         * won't have to change this for a while
         */
	if (rtc_tm->tm_year < 1900)
		rtc_tm->tm_year += 1900;

	if (rtc_tm->tm_year < 1970)
		return -EINVAL;

	yrs = rtc_tm->tm_year % 100;
	cen = rtc_tm->tm_year / 100;
	mon = rtc_tm->tm_mon + 1;   /* tm_mon starts at zero */
	day = rtc_tm->tm_mday;
	dow = rtc_tm->tm_wday & 0x7; /* automatic BCD */
	hrs = rtc_tm->tm_hour;
	min = rtc_tm->tm_min;
	sec = rtc_tm->tm_sec;

	if ((mon > 12) || (day == 0))
		return -EINVAL;

	if (day > rtc_month_days(rtc_tm->tm_mon, rtc_tm->tm_year))
		return -EINVAL;

	if ((hrs >= 24) || (min >= 60) || (sec >= 60))
		return -EINVAL;

	/*
         * each register is a different number of valid bits
         */
	sec = bin2bcd(sec) & 0x7f;
	min = bin2bcd(min) & 0x7f;
	hrs = bin2bcd(hrs) & 0x3f;
	day = bin2bcd(day) & 0x3f;
	mon = bin2bcd(mon) & 0x1f;
	yrs = bin2bcd(yrs) & 0xff;
	cen = bin2bcd(cen) & 0xff;

	spin_lock_irqsave(&ds1511_lock, flags);
	rtc_disable_update();
	rtc_write(cen, RTC_CENTURY);
	rtc_write(yrs, RTC_YEAR);
	rtc_write((rtc_read(RTC_MON) & 0xe0) | mon, RTC_MON);
	rtc_write(day, RTC_DOM);
	rtc_write(hrs, RTC_HOUR);
	rtc_write(min, RTC_MIN);
	rtc_write(sec, RTC_SEC);
	rtc_write(dow, RTC_DOW);
	rtc_enable_update();
	spin_unlock_irqrestore(&ds1511_lock, flags);

	return 0;
}

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static int ds1511_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
{
	unsigned int century;
	unsigned long flags;

	spin_lock_irqsave(&ds1511_lock, flags);
	rtc_disable_update();

	rtc_tm->tm_sec = rtc_read(RTC_SEC) & 0x7f;
	rtc_tm->tm_min = rtc_read(RTC_MIN) & 0x7f;
	rtc_tm->tm_hour = rtc_read(RTC_HOUR) & 0x3f;
	rtc_tm->tm_mday = rtc_read(RTC_DOM) & 0x3f;
	rtc_tm->tm_wday = rtc_read(RTC_DOW) & 0x7;
	rtc_tm->tm_mon = rtc_read(RTC_MON) & 0x1f;
	rtc_tm->tm_year = rtc_read(RTC_YEAR) & 0x7f;
	century = rtc_read(RTC_CENTURY);

	rtc_enable_update();
	spin_unlock_irqrestore(&ds1511_lock, flags);

	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
	rtc_tm->tm_wday = bcd2bin(rtc_tm->tm_wday);
	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
	century = bcd2bin(century) * 100;

	/*
         * Account for differences between how the RTC uses the values
         * and how they are defined in a struct rtc_time;
         */
	century += rtc_tm->tm_year;
	rtc_tm->tm_year = century - 1900;

	rtc_tm->tm_mon--;

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

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/*
 * write the alarm register settings
 *
 * we only have the use to interrupt every second, otherwise
 * known as the update interrupt, or the interrupt if the whole
 * date/hours/mins/secs matches.  the ds1511 has many more
 * permutations, but the kernel doesn't.
 */

static void

ds1511_rtc_update_alarm(struct rtc_plat_data *pdata)
{
	unsigned long flags;

	spin_lock_irqsave(&pdata->lock, flags);
	rtc_write(pdata->alrm_mday < 0 || (pdata->irqen & RTC_UF) ?
	       0x80 : bin2bcd(pdata->alrm_mday) & 0x3f,
	       RTC_ALARM_DATE);
	rtc_write(pdata->alrm_hour < 0 || (pdata->irqen & RTC_UF) ?
	       0x80 : bin2bcd(pdata->alrm_hour) & 0x3f,
	       RTC_ALARM_HOUR);
	rtc_write(pdata->alrm_min < 0 || (pdata->irqen & RTC_UF) ?
	       0x80 : bin2bcd(pdata->alrm_min) & 0x7f,
	       RTC_ALARM_MIN);
	rtc_write(pdata->alrm_sec < 0 || (pdata->irqen & RTC_UF) ?
	       0x80 : bin2bcd(pdata->alrm_sec) & 0x7f,
	       RTC_ALARM_SEC);
	rtc_write(rtc_read(RTC_CMD) | (pdata->irqen ? RTC_TIE : 0), RTC_CMD);
	rtc_read(RTC_CMD1);	/* clear interrupts */
	spin_unlock_irqrestore(&pdata->lock, flags);
}

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static int

ds1511_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;

	ds1511_rtc_update_alarm(pdata);
	return 0;
}

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static int

ds1511_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;
}

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static irqreturn_t

ds1511_interrupt(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	unsigned long events = 0;

	spin_lock(&pdata->lock);
	/*
         * read and clear interrupt
         */
	if (rtc_read(RTC_CMD1) & DS1511_IRQF) {
		events = RTC_IRQF;
		if (rtc_read(RTC_ALARM_SEC) & 0x80)
			events |= RTC_UF;
		else
			events |= RTC_AF;
		rtc_update_irq(pdata->rtc, 1, events);
	}
	spin_unlock(&pdata->lock);
	return events ? IRQ_HANDLED : IRQ_NONE;
}

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static int ds1511_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;
	ds1511_rtc_update_alarm(pdata);
	return 0;
}

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static const struct rtc_class_ops ds1511_rtc_ops = {
	.read_time		= ds1511_rtc_read_time,
	.set_time		= ds1511_rtc_set_time,
	.read_alarm		= ds1511_rtc_read_alarm,
	.set_alarm		= ds1511_rtc_set_alarm,
	.alarm_irq_enable	= ds1511_rtc_alarm_irq_enable,
};


static ssize_t

ds1511_nvram_read(struct file *filp, struct kobject *kobj,
		  struct bin_attribute *ba,
		  char *buf, loff_t pos, size_t size)
{
	ssize_t count;

	rtc_write(pos, DS1511_RAMADDR_LSB);
	for (count = 0; count < size; count++)
		*buf++ = rtc_read(DS1511_RAMDATA);

	return count;
}

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static ssize_t

ds1511_nvram_write(struct file *filp, struct kobject *kobj,
		   struct bin_attribute *bin_attr,
		   char *buf, loff_t pos, size_t size)
{
	ssize_t count;

	rtc_write(pos, DS1511_RAMADDR_LSB);
	for (count = 0; count < size; count++)
		rtc_write(*buf++, DS1511_RAMDATA);

	return count;
}

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static struct bin_attribute ds1511_nvram_attr = {
	.attr = {
		.name = "nvram",
		.mode = S_IRUGO | S_IWUSR,
        },
	.size = DS1511_RAM_MAX,
	.read = ds1511_nvram_read,
	.write = ds1511_nvram_write,
};



static int ds1511_rtc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct rtc_plat_data *pdata;
	int ret = 0;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	ds1511_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ds1511_base))
		return PTR_ERR(ds1511_base);
	pdata->ioaddr = ds1511_base;
	pdata->irq = platform_get_irq(pdev, 0);

	/*
         * turn on the clock and the crystal, etc.
         */
	rtc_write(DS1511_BME, RTC_CMD);
	rtc_write(0, RTC_CMD1);
	/*
         * clear the wdog counter
         */
	rtc_write(0, DS1511_WD_MSEC);
	rtc_write(0, DS1511_WD_SEC);
	/*
         * start the clock
         */
	rtc_enable_update();

	/*
         * check for a dying bat-tree
         */
	if (rtc_read(RTC_CMD1) & DS1511_BLF1)
		dev_warn(&pdev->dev, "voltage-low detected.\n");

	spin_lock_init(&pdata->lock);
	platform_set_drvdata(pdev, pdata);

	pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
					      &ds1511_rtc_ops, THIS_MODULE);
	if (IS_ERR(pdata->rtc))
		return PTR_ERR(pdata->rtc);

	/*
         * if the platform has an interrupt in mind for this device,
         * then by all means, set it
         */
	if (pdata->irq > 0) {
		rtc_read(RTC_CMD1);
		if (devm_request_irq(&pdev->dev, pdata->irq, ds1511_interrupt,
			IRQF_SHARED, pdev->name, pdev) < 0) {

			dev_warn(&pdev->dev, "interrupt not available.\n");
			pdata->irq = 0;
		}
	}

	ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
	if (ret)
		dev_err(&pdev->dev, "Unable to create sysfs entry: %s\n",
			ds1511_nvram_attr.attr.name);

	return 0;
}

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static int ds1511_rtc_remove(struct platform_device *pdev)
{
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	sysfs_remove_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);
	if (pdata->irq > 0) {
		/*
                 * disable the alarm interrupt
                 */
		rtc_write(rtc_read(RTC_CMD) & ~RTC_TIE, RTC_CMD);
		rtc_read(RTC_CMD1);
	}
	return 0;
}

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/* work with hotplug and coldplug */
MODULE_ALIAS("platform:ds1511");


static struct platform_driver ds1511_rtc_driver = {
	.probe		= ds1511_rtc_probe,
	.remove		= ds1511_rtc_remove,
	.driver		= {
		.name	= "ds1511",
        },
};


module_platform_driver(ds1511_rtc_driver);

MODULE_AUTHOR("Andrew Sharp <andy.sharp@lsi.com>");
MODULE_DESCRIPTION("Dallas DS1511 RTC driver");
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
andrew sharp
andrew sharp
2140
90.75%
2
11.76%
atsushi nemoto
atsushi nemoto
82
3.48%
1
5.88%
alessandro zummo
alessandro zummo
52
2.21%
1
5.88%
adrian bunk
adrian bunk
25
1.06%
2
11.76%
julia lawall
julia lawall
13
0.55%
1
5.88%
vladimir zapolskiy
vladimir zapolskiy
11
0.47%
1
5.88%
chris wright
chris wright
10
0.42%
1
5.88%
kay sievers
kay sievers
6
0.25%
1
5.88%
anton vorontsov
anton vorontsov
6
0.25%
1
5.88%
paul gortmaker
paul gortmaker
3
0.13%
1
5.88%
tejun heo
tejun heo
3
0.13%
1
5.88%
jingoo han
jingoo han
2
0.08%
1
5.88%
steven rostedt
steven rostedt
2
0.08%
1
5.88%
axel lin
axel lin
2
0.08%
1
5.88%
vasiliy kulikov
vasiliy kulikov
1
0.04%
1
5.88%
greg kroah-hartman
greg kroah-hartman
0.00%
0
0.00%
Total
2358
100.00%
17
100.00%
  
Directory: drivers/rtc

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