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Commit 4f9b9bba authored by Geert Uytterhoeven's avatar Geert Uytterhoeven
Browse files

rtc: Add an RTC driver for the Oki MSM6242 



Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: default avatarAlessandro Zummo <alessandro.zummo@towertech.it>
parent 22763c5c

drivers/rtc/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -509,6 +509,15 @@ config RTC_DRV_M48T59 
	  This driver can also be built as a module, if so, the module

	  will be called "rtc-m48t59".



config RTC_DRV_MSM6242

	tristate "Oki MSM6242"

	help

	  If you say yes here you get support for the Oki MSM6242

	  timekeeping chip. It is used in some Amiga models (e.g. A2000).



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

	  will be called rtc-msm6242.



config RTC_MXC

	tristate "Freescale MXC Real Time Clock"

	depends on ARCH_MXC

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o 
obj-$(CONFIG_RTC_MXC)		+= rtc-mxc.o

obj-$(CONFIG_RTC_DRV_MAX6900)	+= rtc-max6900.o

obj-$(CONFIG_RTC_DRV_MAX6902)	+= rtc-max6902.o

obj-$(CONFIG_RTC_DRV_MSM6242)	+= rtc-msm6242.o

obj-$(CONFIG_RTC_DRV_MV)	+= rtc-mv.o

obj-$(CONFIG_RTC_DRV_OMAP)	+= rtc-omap.o

obj-$(CONFIG_RTC_DRV_PCAP)	+= rtc-pcap.o

drivers/rtc/rtc-msm6242.c

0 → 100644
+269 −0
Original line number Diff line number Diff line 
/*

 *  Oki MSM6242 RTC Driver

 *

 *  Copyright 2009 Geert Uytterhoeven

 *

 *  Based on the A2000 TOD code in arch/m68k/amiga/config.c

 *  Copyright (C) 1993 Hamish Macdonald

 */



#include <linux/delay.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>





enum {

	MSM6242_SECOND1		= 0x0,	/* 1-second digit register */

	MSM6242_SECOND10	= 0x1,	/* 10-second digit register */

	MSM6242_MINUTE1		= 0x2,	/* 1-minute digit register */

	MSM6242_MINUTE10	= 0x3,	/* 10-minute digit register */

	MSM6242_HOUR1		= 0x4,	/* 1-hour digit register */

	MSM6242_HOUR10		= 0x5,	/* PM/AM, 10-hour digit register */

	MSM6242_DAY1		= 0x6,	/* 1-day digit register */

	MSM6242_DAY10		= 0x7,	/* 10-day digit register */

	MSM6242_MONTH1		= 0x8,	/* 1-month digit register */

	MSM6242_MONTH10		= 0x9,	/* 10-month digit register */

	MSM6242_YEAR1		= 0xa,	/* 1-year digit register */

	MSM6242_YEAR10		= 0xb,	/* 10-year digit register */

	MSM6242_WEEK		= 0xc,	/* Week register */

	MSM6242_CD		= 0xd,	/* Control Register D */

	MSM6242_CE		= 0xe,	/* Control Register E */

	MSM6242_CF		= 0xf,	/* Control Register F */

};



#define MSM6242_HOUR10_AM	(0 << 2)

#define MSM6242_HOUR10_PM	(1 << 2)

#define MSM6242_HOUR10_HR_MASK	(3 << 0)



#define MSM6242_WEEK_SUNDAY	0

#define MSM6242_WEEK_MONDAY	1

#define MSM6242_WEEK_TUESDAY	2

#define MSM6242_WEEK_WEDNESDAY	3

#define MSM6242_WEEK_THURSDAY	4

#define MSM6242_WEEK_FRIDAY	5

#define MSM6242_WEEK_SATURDAY	6



#define MSM6242_CD_30_S_ADJ	(1 << 3)	/* 30-second adjustment */

#define MSM6242_CD_IRQ_FLAG	(1 << 2)

#define MSM6242_CD_BUSY		(1 << 1)

#define MSM6242_CD_HOLD		(1 << 0)



#define MSM6242_CE_T_MASK	(3 << 2)

#define MSM6242_CE_T_64HZ	(0 << 2)	/* period 1/64 second */

#define MSM6242_CE_T_1HZ	(1 << 2)	/* period 1 second */

#define MSM6242_CE_T_1MINUTE	(2 << 2)	/* period 1 minute */

#define MSM6242_CE_T_1HOUR	(3 << 2)	/* period 1 hour */



#define MSM6242_CE_ITRPT_STND	(1 << 1)

#define MSM6242_CE_MASK		(1 << 0)	/* STD.P output control */



#define MSM6242_CF_TEST		(1 << 3)

#define MSM6242_CF_12H		(0 << 2)

#define MSM6242_CF_24H		(1 << 2)

#define MSM6242_CF_STOP		(1 << 1)

#define MSM6242_CF_REST		(1 << 0)	/* reset */





struct msm6242_priv {

	u32 __iomem *regs;

	struct rtc_device *rtc;

};



static inline unsigned int msm6242_read(struct msm6242_priv *priv,

				       unsigned int reg)

{

	return __raw_readl(&priv->regs[reg]) & 0xf;

}



static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val,

				unsigned int reg)

{

	return __raw_writel(val, &priv->regs[reg]);

}



static inline void msm6242_set(struct msm6242_priv *priv, unsigned int val,

			       unsigned int reg)

{

	msm6242_write(priv, msm6242_read(priv, reg) | val, reg);

}



static inline void msm6242_clear(struct msm6242_priv *priv, unsigned int val,

				 unsigned int reg)

{

	msm6242_write(priv, msm6242_read(priv, reg) & ~val, reg);

}



static void msm6242_lock(struct msm6242_priv *priv)

{

	int cnt = 5;



	msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);



	while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) {

		msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);

		udelay(70);

		msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);

		cnt--;

	}



	if (!cnt)

		pr_warning("msm6242: timed out waiting for RTC (0x%x)\n",

			   msm6242_read(priv, MSM6242_CD));

}



static void msm6242_unlock(struct msm6242_priv *priv)

{

	msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);

}



static int msm6242_read_time(struct device *dev, struct rtc_time *tm)

{

	struct msm6242_priv *priv = dev_get_drvdata(dev);



	msm6242_lock(priv);



	tm->tm_sec  = msm6242_read(priv, MSM6242_SECOND10) * 10 +

		      msm6242_read(priv, MSM6242_SECOND1);

	tm->tm_min  = msm6242_read(priv, MSM6242_MINUTE10) * 10 +

		      msm6242_read(priv, MSM6242_MINUTE1);

	tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10 & 3)) * 10 +

		      msm6242_read(priv, MSM6242_HOUR1);

	tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 +

		      msm6242_read(priv, MSM6242_DAY1);

	tm->tm_wday = msm6242_read(priv, MSM6242_WEEK);

	tm->tm_mon  = msm6242_read(priv, MSM6242_MONTH10) * 10 +

		      msm6242_read(priv, MSM6242_MONTH1) - 1;

	tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 +

		      msm6242_read(priv, MSM6242_YEAR1);

	if (tm->tm_year <= 69)

		tm->tm_year += 100;



	if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) {

		unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) &

				  MSM6242_HOUR10_PM;

		if (!pm && tm->tm_hour == 12)

			tm->tm_hour = 0;

		else if (pm && tm->tm_hour != 12)

			tm->tm_hour += 12;

	}



	msm6242_unlock(priv);



	return rtc_valid_tm(tm);

}



static int msm6242_set_time(struct device *dev, struct rtc_time *tm)

{

	struct msm6242_priv *priv = dev_get_drvdata(dev);



	msm6242_lock(priv);



	msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10);

	msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1);

	msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10);

	msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1);

	if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)

		msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);

	else if (tm->tm_hour >= 12)

		msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10,

			      MSM6242_HOUR10);

	else

		msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);

	msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1);

	msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10);

	msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1);

	if (tm->tm_wday != -1)

		msm6242_write(priv, tm->tm_wday, MSM6242_WEEK);

	msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10);

	msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1);

	if (tm->tm_year >= 100)

		tm->tm_year -= 100;

	msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10);

	msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1);



	msm6242_unlock(priv);

	return 0;

}



static const struct rtc_class_ops msm6242_rtc_ops = {

	.read_time	= msm6242_read_time,

	.set_time	= msm6242_set_time,

};



static int __init msm6242_rtc_probe(struct platform_device *dev)

{

	struct resource *res;

	struct msm6242_priv *priv;

	struct rtc_device *rtc;

	int error;



	res = platform_get_resource(dev, IORESOURCE_MEM, 0);

	if (!res)

		return -ENODEV;



	priv = kzalloc(sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return -ENOMEM;



	priv->regs = ioremap(res->start, resource_size(res));

	if (!priv->regs) {

		error = -ENOMEM;

		goto out_free_priv;

	}



	rtc = rtc_device_register("rtc-msm6242", &dev->dev, &msm6242_rtc_ops,

				  THIS_MODULE);

	if (IS_ERR(rtc)) {

		error = PTR_ERR(rtc);

		goto out_unmap;

	}



	priv->rtc = rtc;

	platform_set_drvdata(dev, priv);

	return 0;



out_unmap:

	iounmap(priv->regs);

out_free_priv:

	kfree(priv);

	return error;

}



static int __exit msm6242_rtc_remove(struct platform_device *dev)

{

	struct msm6242_priv *priv = platform_get_drvdata(dev);



	rtc_device_unregister(priv->rtc);

	iounmap(priv->regs);

	kfree(priv);

	return 0;

}



static struct platform_driver msm6242_rtc_driver = {

	.driver	= {

		.name	= "rtc-msm6242",

		.owner	= THIS_MODULE,

	},

	.remove	= __exit_p(msm6242_rtc_remove),

};



static int __init msm6242_rtc_init(void)

{

	return platform_driver_probe(&msm6242_rtc_driver, msm6242_rtc_probe);

}



static void __exit msm6242_rtc_fini(void)

{

	platform_driver_unregister(&msm6242_rtc_driver);

}



module_init(msm6242_rtc_init);

module_exit(msm6242_rtc_fini);



MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("Oki MSM6242 RTC driver");

MODULE_ALIAS("platform:rtc-msm6242");