Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4f672ce2 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven
Browse files

rtc: Add an RTC driver for the Ricoh RP5C01 



Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: default avatarAlessandro Zummo <alessandro.zummo@towertech.it>
parent 4f9b9bba

drivers/rtc/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -538,6 +538,16 @@ config RTC_DRV_BQ4802 
	  This driver can also be built as a module. If so, the module

	  will be called rtc-bq4802.



config RTC_DRV_RP5C01

	tristate "Ricoh RP5C01"

	help

	  If you say yes here you get support for the Ricoh RP5C01

	  timekeeping chip. It is used in some Amiga models (e.g. A3000

	  and A4000).



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

	  will be called rtc-rp5c01.



config RTC_DRV_V3020

	tristate "EM Microelectronic V3020"

	help

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o 
obj-$(CONFIG_RTC_DRV_PS3)	+= rtc-ps3.o

obj-$(CONFIG_RTC_DRV_PXA)	+= rtc-pxa.o

obj-$(CONFIG_RTC_DRV_R9701)	+= rtc-r9701.o

obj-$(CONFIG_RTC_DRV_RP5C01)	+= rtc-rp5c01.o

obj-$(CONFIG_RTC_DRV_RS5C313)	+= rtc-rs5c313.o

obj-$(CONFIG_RTC_DRV_RS5C348)	+= rtc-rs5c348.o

obj-$(CONFIG_RTC_DRV_RS5C372)	+= rtc-rs5c372.o

drivers/rtc/rtc-rp5c01.c

0 → 100644
+222 −0
Original line number Diff line number Diff line 
/*

 *  Ricoh RP5C01 RTC Driver

 *

 *  Copyright 2009 Geert Uytterhoeven

 *

 *  Based on the A3000 TOD code in arch/m68k/amiga/config.c

 *  Copyright (C) 1993 Hamish Macdonald

 */



#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>





enum {

	RP5C01_1_SECOND		= 0x0,	/* MODE 00 */

	RP5C01_10_SECOND	= 0x1,	/* MODE 00 */

	RP5C01_1_MINUTE		= 0x2,	/* MODE 00 and MODE 01 */

	RP5C01_10_MINUTE	= 0x3,	/* MODE 00 and MODE 01 */

	RP5C01_1_HOUR		= 0x4,	/* MODE 00 and MODE 01 */

	RP5C01_10_HOUR		= 0x5,	/* MODE 00 and MODE 01 */

	RP5C01_DAY_OF_WEEK	= 0x6,	/* MODE 00 and MODE 01 */

	RP5C01_1_DAY		= 0x7,	/* MODE 00 and MODE 01 */

	RP5C01_10_DAY		= 0x8,	/* MODE 00 and MODE 01 */

	RP5C01_1_MONTH		= 0x9,	/* MODE 00 */

	RP5C01_10_MONTH		= 0xa,	/* MODE 00 */

	RP5C01_1_YEAR		= 0xb,	/* MODE 00 */

	RP5C01_10_YEAR		= 0xc,	/* MODE 00 */



	RP5C01_12_24_SELECT	= 0xa,	/* MODE 01 */

	RP5C01_LEAP_YEAR	= 0xb,	/* MODE 01 */



	RP5C01_MODE		= 0xd,	/* all modes */

	RP5C01_TEST		= 0xe,	/* all modes */

	RP5C01_RESET		= 0xf,	/* all modes */

};



#define RP5C01_12_24_SELECT_12	(0 << 0)

#define RP5C01_12_24_SELECT_24	(1 << 0)



#define RP5C01_10_HOUR_AM	(0 << 1)

#define RP5C01_10_HOUR_PM	(1 << 1)



#define RP5C01_MODE_TIMER_EN	(1 << 3)	/* timer enable */

#define RP5C01_MODE_ALARM_EN	(1 << 2)	/* alarm enable */



#define RP5C01_MODE_MODE_MASK	(3 << 0)

#define RP5C01_MODE_MODE00	(0 << 0)	/* time */

#define RP5C01_MODE_MODE01	(1 << 0)	/* alarm, 12h/24h, leap year */

#define RP5C01_MODE_RAM_BLOCK10	(2 << 0)	/* RAM 4 bits x 13 */

#define RP5C01_MODE_RAM_BLOCK11	(3 << 0)	/* RAM 4 bits x 13 */



#define RP5C01_RESET_1HZ_PULSE	(1 << 3)

#define RP5C01_RESET_16HZ_PULSE	(1 << 2)

#define RP5C01_RESET_SECOND	(1 << 1)	/* reset divider stages for */

						/* seconds or smaller units */

#define RP5C01_RESET_ALARM	(1 << 0)	/* reset all alarm registers */





struct rp5c01_priv {

	u32 __iomem *regs;

	struct rtc_device *rtc;

};



static inline unsigned int rp5c01_read(struct rp5c01_priv *priv,

				       unsigned int reg)

{

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

}



static inline void rp5c01_write(struct rp5c01_priv *priv, unsigned int val,

				unsigned int reg)

{

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

}



static void rp5c01_lock(struct rp5c01_priv *priv)

{

	rp5c01_write(priv, RP5C01_MODE_MODE00, RP5C01_MODE);

}



static void rp5c01_unlock(struct rp5c01_priv *priv)

{

	rp5c01_write(priv, RP5C01_MODE_TIMER_EN | RP5C01_MODE_MODE01,

		     RP5C01_MODE);

}



static int rp5c01_read_time(struct device *dev, struct rtc_time *tm)

{

	struct rp5c01_priv *priv = dev_get_drvdata(dev);



	rp5c01_lock(priv);



	tm->tm_sec  = rp5c01_read(priv, RP5C01_10_SECOND) * 10 +

		      rp5c01_read(priv, RP5C01_1_SECOND);

	tm->tm_min  = rp5c01_read(priv, RP5C01_10_MINUTE) * 10 +

		      rp5c01_read(priv, RP5C01_1_MINUTE);

	tm->tm_hour = rp5c01_read(priv, RP5C01_10_HOUR) * 10 +

		      rp5c01_read(priv, RP5C01_1_HOUR);

	tm->tm_mday = rp5c01_read(priv, RP5C01_10_DAY) * 10 +

		      rp5c01_read(priv, RP5C01_1_DAY);

	tm->tm_wday = rp5c01_read(priv, RP5C01_DAY_OF_WEEK);

	tm->tm_mon  = rp5c01_read(priv, RP5C01_10_MONTH) * 10 +

		      rp5c01_read(priv, RP5C01_1_MONTH) - 1;

	tm->tm_year = rp5c01_read(priv, RP5C01_10_YEAR) * 10 +

		      rp5c01_read(priv, RP5C01_1_YEAR);

	if (tm->tm_year <= 69)

		tm->tm_year += 100;



	rp5c01_unlock(priv);



	return rtc_valid_tm(tm);

}



static int rp5c01_set_time(struct device *dev, struct rtc_time *tm)

{

	struct rp5c01_priv *priv = dev_get_drvdata(dev);



	rp5c01_lock(priv);



	rp5c01_write(priv, tm->tm_sec / 10, RP5C01_10_SECOND);

	rp5c01_write(priv, tm->tm_sec % 10, RP5C01_1_SECOND);

	rp5c01_write(priv, tm->tm_min / 10, RP5C01_10_MINUTE);

	rp5c01_write(priv, tm->tm_min % 10, RP5C01_1_MINUTE);

	rp5c01_write(priv, tm->tm_hour / 10, RP5C01_10_HOUR);

	rp5c01_write(priv, tm->tm_hour % 10, RP5C01_1_HOUR);

	rp5c01_write(priv, tm->tm_mday / 10, RP5C01_10_DAY);

	rp5c01_write(priv, tm->tm_mday % 10, RP5C01_1_DAY);

	if (tm->tm_wday != -1)

		rp5c01_write(priv, tm->tm_wday, RP5C01_DAY_OF_WEEK);

	rp5c01_write(priv, (tm->tm_mon + 1) / 10, RP5C01_10_MONTH);

	rp5c01_write(priv, (tm->tm_mon + 1) % 10, RP5C01_1_MONTH);

	if (tm->tm_year >= 100)

		tm->tm_year -= 100;

	rp5c01_write(priv, tm->tm_year / 10, RP5C01_10_YEAR);

	rp5c01_write(priv, tm->tm_year % 10, RP5C01_1_YEAR);



	rp5c01_unlock(priv);

	return 0;

}



static const struct rtc_class_ops rp5c01_rtc_ops = {

	.read_time	= rp5c01_read_time,

	.set_time	= rp5c01_set_time,

};



static int __init rp5c01_rtc_probe(struct platform_device *dev)

{

	struct resource *res;

	struct rp5c01_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-rp5c01", &dev->dev, &rp5c01_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 rp5c01_rtc_remove(struct platform_device *dev)

{

	struct rp5c01_priv *priv = platform_get_drvdata(dev);



	rtc_device_unregister(priv->rtc);

	iounmap(priv->regs);

	kfree(priv);

	return 0;

}



static struct platform_driver rp5c01_rtc_driver = {

	.driver	= {

		.name	= "rtc-rp5c01",

		.owner	= THIS_MODULE,

	},

	.remove	= __exit_p(rp5c01_rtc_remove),

};



static int __init rp5c01_rtc_init(void)

{

	return platform_driver_probe(&rp5c01_rtc_driver, rp5c01_rtc_probe);

}



static void __exit rp5c01_rtc_fini(void)

{

	platform_driver_unregister(&rp5c01_rtc_driver);

}



module_init(rp5c01_rtc_init);

module_exit(rp5c01_rtc_fini);



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

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("Ricoh RP5C01 RTC driver");

MODULE_ALIAS("platform:rtc-rp5c01");