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Commit 8f26795a authored by Andrew Sharp's avatar Andrew Sharp Committed by Linus Torvalds
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Platform real time clock driver for Dallas 1511 chip 



Add RTC support for DS1511 RTC/WDT chip.

Signed-off-by: default avatarAndy Sharp <andy.sharp@onstor.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8a0bdfd7

drivers/rtc/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -312,6 +312,16 @@ config RTC_DRV_DS1302 
	help

	  If you say yes here you get support for the Dallas DS1302 RTC chips.



config RTC_DRV_DS1511

	tristate "Dallas DS1511"

	depends on RTC_CLASS

	help

	  If you say yes here you get support for the

	  Dallas DS1511 timekeeping/watchdog chip.



	  This driver can also be built as a module. If so, the module

	  will be called rtc-ds1511.



config RTC_DRV_DS1553

	tristate "Maxim/Dallas DS1553"

	help

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ obj-$(CONFIG_RTC_DRV_DS1216) += rtc-ds1216.o 
obj-$(CONFIG_RTC_DRV_DS1302)	+= rtc-ds1302.o

obj-$(CONFIG_RTC_DRV_DS1307)	+= rtc-ds1307.o

obj-$(CONFIG_RTC_DRV_DS1374)	+= rtc-ds1374.o

obj-$(CONFIG_RTC_DRV_DS1511)	+= rtc-ds1511.o

obj-$(CONFIG_RTC_DRV_DS1553)	+= rtc-ds1553.o

obj-$(CONFIG_RTC_DRV_DS1672)	+= rtc-ds1672.o

obj-$(CONFIG_RTC_DRV_DS1742)	+= rtc-ds1742.o

drivers/rtc/rtc-ds1511.c

0 → 100644
+656 −0
Original line number Diff line number Diff line 
/*

 * An rtc driver for the Dallas DS1511

 *

 * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>

 * Copyright (C) 2007 Andrew Sharp <andy.sharp@onstor.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/delay.h>

#include <linux/interrupt.h>

#include <linux/rtc.h>

#include <linux/platform_device.h>

#include <linux/io.h>



#define DRV_VERSION "0.6"



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	0xff



#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 */

	unsigned long baseaddr;		/* physical base address */

	int size;				/* amount of memory mapped */

	int irq;

	unsigned int irqen;

	int alrm_sec;

	int alrm_min;

	int alrm_hour;

	int alrm_mday;

};



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));

}



 static inline void

rtc_write_alarm(uint8_t val, enum ds1511reg reg)

{

	rtc_write((val | 0x80), reg);

}



 static noinline uint8_t

rtc_read(enum ds1511reg reg)

{

	return readb(ds1511_base + (reg * reg_spacing));

}



 static inline void

rtc_disable_update(void)

{

	rtc_write((rtc_read(RTC_CMD) & ~RTC_TE), RTC_CMD);

}



 static void

rtc_enable_update(void)

{

	rtc_write((rtc_read(RTC_CMD) | RTC_TE), RTC_CMD);

}



/*

 * #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(DS1511_WDE | DS1511_WDS, RTC_CMD);

}



 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);

}

#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.

 */

 int

ds1511_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm)

{

	u8 mon, day, dow, hrs, min, sec, yrs, cen;

	unsigned int 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;

}



 int

ds1511_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)

{

	unsigned int century;

	unsigned int 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;

}



/*

 * 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->rtc->irq_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->rtc->irq_lock, flags);

}



 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;

}



 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;

}



 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 = RTC_IRQF;



	/*

	 * read and clear interrupt

	 */

	if (!(rtc_read(RTC_CMD1) & DS1511_IRQF)) {

		return IRQ_NONE;

	}

	if (rtc_read(RTC_ALARM_SEC) & 0x80) {

		events |= RTC_UF;

	} else {

		events |= RTC_AF;

	}

	rtc_update_irq(pdata->rtc, 1, events);

	return IRQ_HANDLED;

}



 static void

ds1511_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;

		ds1511_rtc_update_alarm(pdata);

	}

}



 static int

ds1511_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;

		ds1511_rtc_update_alarm(pdata);

		break;

	case RTC_AIE_ON:

		pdata->irqen |= RTC_AF;

		ds1511_rtc_update_alarm(pdata);

		break;

	case RTC_UIE_OFF:

		pdata->irqen &= ~RTC_UF;

		ds1511_rtc_update_alarm(pdata);

		break;

	case RTC_UIE_ON:

		pdata->irqen |= RTC_UF;

		ds1511_rtc_update_alarm(pdata);

		break;

	default:

		return -ENOIOCTLCMD;

	}

	return 0;

}



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,

	.release	= ds1511_rtc_release,

	.ioctl		= ds1511_rtc_ioctl,

};



 static ssize_t

ds1511_nvram_read(struct kobject *kobj, struct bin_attribute *ba,

				char *buf, loff_t pos, size_t size)

{

	ssize_t count;



	/*

	 * if count is more than one, turn on "burst" mode

	 * turn it off when you're done

	 */

	if (size > 1) {

		rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD);

	}

	if (pos > DS1511_RAM_MAX) {

		pos = DS1511_RAM_MAX;

	}

	if (size + pos > DS1511_RAM_MAX + 1) {

		size = DS1511_RAM_MAX - pos + 1;

	}

	rtc_write(pos, DS1511_RAMADDR_LSB);

	for (count = 0; size > 0; count++, size--) {

		*buf++ = rtc_read(DS1511_RAMDATA);

	}

	if (count > 1) {

		rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD);

	}

	return count;

}



 static ssize_t

ds1511_nvram_write(struct kobject *kobj, struct bin_attribute *bin_attr,

				char *buf, loff_t pos, size_t size)

{

	ssize_t count;



	/*

	 * if count is more than one, turn on "burst" mode

	 * turn it off when you're done

	 */

	if (size > 1) {

		rtc_write((rtc_read(RTC_CMD) | DS1511_BME), RTC_CMD);

	}

	if (pos > DS1511_RAM_MAX) {

		pos = DS1511_RAM_MAX;

	}

	if (size + pos > DS1511_RAM_MAX + 1) {

		size = DS1511_RAM_MAX - pos + 1;

	}

	rtc_write(pos, DS1511_RAMADDR_LSB);

	for (count = 0; size > 0; count++, size--) {

		rtc_write(*buf++, DS1511_RAMDATA);

	}

	if (count > 1) {

		rtc_write((rtc_read(RTC_CMD) & ~DS1511_BME), RTC_CMD);

	}

	return count;

}



static struct bin_attribute ds1511_nvram_attr = {

	.attr = {

		.name = "nvram",

		.mode = S_IRUGO | S_IWUGO,

		.owner = THIS_MODULE,

	},

	.size = DS1511_RAM_MAX,

	.read = ds1511_nvram_read,

	.write = ds1511_nvram_write,

};



 static int __devinit

ds1511_rtc_probe(struct platform_device *pdev)

{

	struct rtc_device *rtc;

	struct resource *res;

	struct rtc_plat_data *pdata = 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;

	pdata->size = res->end - res->start + 1;

	if (!request_mem_region(res->start, pdata->size, pdev->name)) {

		ret = -EBUSY;

		goto out;

	}

	pdata->baseaddr = res->start;

	pdata->size = pdata->size;

	ds1511_base = ioremap(pdata->baseaddr, pdata->size);

	if (!ds1511_base) {

		ret = -ENOMEM;

		goto out;

	}

	pdata->ioaddr = ds1511_base;

	pdata->irq = platform_get_irq(pdev, 0);



	/*

	 * turn on the clock and the crystal, etc.

	 */

	rtc_write(0, 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");

	}



	/*

	 * 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 (request_irq(pdata->irq, ds1511_interrupt,

			IRQF_DISABLED | 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, &ds1511_rtc_ops,

		THIS_MODULE);

	if (IS_ERR(rtc)) {

		ret = PTR_ERR(rtc);

		goto out;

	}

	pdata->rtc = rtc;

	platform_set_drvdata(pdev, pdata);

	ret = sysfs_create_bin_file(&pdev->dev.kobj, &ds1511_nvram_attr);

	if (ret) {

		goto out;

	}

	return 0;

 out:

	if (pdata->rtc) {

		rtc_device_unregister(pdata->rtc);

	}

	if (pdata->irq >= 0) {

		free_irq(pdata->irq, pdev);

	}

	if (ds1511_base) {

		iounmap(ds1511_base);

		ds1511_base = NULL;

	}

	if (pdata->baseaddr) {

		release_mem_region(pdata->baseaddr, pdata->size);

	}



	kfree(pdata);

	return ret;

}



 static int __devexit

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);

	rtc_device_unregister(pdata->rtc);

	pdata->rtc = NULL;

	if (pdata->irq >= 0) {

		/*

		 * disable the alarm interrupt

		 */

		rtc_write(rtc_read(RTC_CMD) & ~RTC_TIE, RTC_CMD);

		rtc_read(RTC_CMD1);

		free_irq(pdata->irq, pdev);

	}

	iounmap(pdata->ioaddr);

	ds1511_base = NULL;

	release_mem_region(pdata->baseaddr, pdata->size);

	kfree(pdata);

	return 0;

}



static struct platform_driver ds1511_rtc_driver = {

	.probe		= ds1511_rtc_probe,

	.remove		= __devexit_p(ds1511_rtc_remove),

	.driver		= {

		.name	= "ds1511",

		.owner	= THIS_MODULE,

	},

};



 static int __init

ds1511_rtc_init(void)

{

	return platform_driver_register(&ds1511_rtc_driver);

}



 static void __exit

ds1511_rtc_exit(void)

{

	return platform_driver_unregister(&ds1511_rtc_driver);

}



module_init(ds1511_rtc_init);

module_exit(ds1511_rtc_exit);



MODULE_AUTHOR("Andrew Sharp <andy.sharp@onstor.com>");

MODULE_DESCRIPTION("Dallas DS1511 RTC driver");

MODULE_LICENSE("GPL");

MODULE_VERSION(DRV_VERSION);