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Commit afd49a7e authored by Wan ZongShun's avatar Wan ZongShun Committed by Linus Torvalds
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ARM: NUC900: add RTC driver support for nuc910 and nuc920 



Signed-off-by: default avatarWan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Hu Ruihuan <specter118@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: "jack wang" <jack_wang@usish.com>
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 d973b632

drivers/rtc/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -601,6 +601,12 @@ config RTC_DRV_AB3100 
	  Select this to enable the ST-Ericsson AB3100 Mixed Signal IC RTC

	  support. This chip contains a battery- and capacitor-backed RTC.



config RTC_DRV_NUC900

	tristate "NUC910/NUC920 RTC driver"

	depends on RTC_CLASS && ARCH_W90X900

	help

	  If you say yes here you get support for the RTC subsystem of the

	  NUC910/NUC920 used in embedded systems.



comment "on-CPU RTC drivers"

drivers/rtc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -56,6 +56,7 @@ obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o 
obj-$(CONFIG_RTC_DRV_MC13783)	+= rtc-mc13783.o

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

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

obj-$(CONFIG_RTC_DRV_NUC900)	+= rtc-nuc900.o

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

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

obj-$(CONFIG_RTC_DRV_PCF8563)	+= rtc-pcf8563.o

drivers/rtc/rtc-nuc900.c

0 → 100644
+342 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2008-2009 Nuvoton technology corporation.

 *

 * Wan ZongShun <mcuos.com@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation;version 2 of the License.

 *

 */



#include <linux/module.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>

#include <linux/delay.h>

#include <linux/io.h>

#include <linux/bcd.h>



/* RTC Control Registers */

#define REG_RTC_INIR		0x00

#define REG_RTC_AER		0x04

#define REG_RTC_FCR		0x08

#define REG_RTC_TLR		0x0C

#define REG_RTC_CLR		0x10

#define REG_RTC_TSSR		0x14

#define REG_RTC_DWR		0x18

#define REG_RTC_TAR		0x1C

#define REG_RTC_CAR		0x20

#define REG_RTC_LIR		0x24

#define REG_RTC_RIER		0x28

#define REG_RTC_RIIR		0x2C

#define REG_RTC_TTR		0x30



#define RTCSET			0x01

#define AERRWENB		0x10000

#define INIRRESET		0xa5eb1357

#define AERPOWERON		0xA965

#define AERPOWEROFF		0x0000

#define LEAPYEAR		0x0001

#define TICKENB			0x80

#define TICKINTENB		0x0002

#define ALARMINTENB		0x0001

#define MODE24			0x0001



struct nuc900_rtc {

	int			irq_num;

	void __iomem		*rtc_reg;

	struct rtc_device	*rtcdev;

};



struct nuc900_bcd_time {

	int bcd_sec;

	int bcd_min;

	int bcd_hour;

	int bcd_mday;

	int bcd_mon;

	int bcd_year;

};



static irqreturn_t nuc900_rtc_interrupt(int irq, void *_rtc)

{

	struct nuc900_rtc *rtc = _rtc;

	unsigned long events = 0, rtc_irq;



	rtc_irq = __raw_readl(rtc->rtc_reg + REG_RTC_RIIR);



	if (rtc_irq & ALARMINTENB) {

		rtc_irq &= ~ALARMINTENB;

		__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);

		events |= RTC_AF | RTC_IRQF;

	}



	if (rtc_irq & TICKINTENB) {

		rtc_irq &= ~TICKINTENB;

		__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);

		events |= RTC_UF | RTC_IRQF;

	}



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



	return IRQ_HANDLED;

}



static int *check_rtc_access_enable(struct nuc900_rtc *nuc900_rtc)

{

	unsigned int i;

	__raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR);



	mdelay(10);



	__raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER);



	for (i = 0; i < 1000; i++) {

		if (__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB)

			return 0;

	}



	if ((__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB) == 0x0)

		return ERR_PTR(-ENODEV);



	return ERR_PTR(-EPERM);

}



static void nuc900_rtc_bcd2bin(unsigned int timereg,

				unsigned int calreg, struct rtc_time *tm)

{

	tm->tm_mday	= bcd2bin(calreg >> 0);

	tm->tm_mon	= bcd2bin(calreg >> 8);

	tm->tm_year	= bcd2bin(calreg >> 16) + 100;



	tm->tm_sec	= bcd2bin(timereg >> 0);

	tm->tm_min	= bcd2bin(timereg >> 8);

	tm->tm_hour	= bcd2bin(timereg >> 16);



	rtc_valid_tm(tm);

}



static void nuc900_rtc_bin2bcd(struct rtc_time *settm,

						struct nuc900_bcd_time *gettm)

{

	gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0;

	gettm->bcd_mon  = bin2bcd(settm->tm_mon) << 8;

	gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16;



	gettm->bcd_sec  = bin2bcd(settm->tm_sec) << 0;

	gettm->bcd_min  = bin2bcd(settm->tm_min) << 8;

	gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16;

}



static int nuc900_update_irq_enable(struct device *dev, unsigned int enabled)

{

	struct nuc900_rtc *rtc = dev_get_drvdata(dev);



	if (enabled)

		__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|

				(TICKINTENB), rtc->rtc_reg + REG_RTC_RIER);

	else

		__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)&

				(~TICKINTENB), rtc->rtc_reg + REG_RTC_RIER);



	return 0;

}



static int nuc900_alarm_irq_enable(struct device *dev, unsigned int enabled)

{

	struct nuc900_rtc *rtc = dev_get_drvdata(dev);



	if (enabled)

		__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|

				(ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);

	else

		__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)&

				(~ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);



	return 0;

}



static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm)

{

	struct nuc900_rtc *rtc = dev_get_drvdata(dev);

	unsigned int timeval, clrval;



	timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR);

	clrval	= __raw_readl(rtc->rtc_reg + REG_RTC_CLR);



	nuc900_rtc_bcd2bin(timeval, clrval, tm);



	return 0;

}



static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm)

{

	struct nuc900_rtc *rtc = dev_get_drvdata(dev);

	struct nuc900_bcd_time gettm;

	unsigned long val;

	int *err;



	nuc900_rtc_bin2bcd(tm, &gettm);



	err = check_rtc_access_enable(rtc);

	if (IS_ERR(err))

		return PTR_ERR(err);



	val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year;

	__raw_writel(val, rtc->rtc_reg + REG_RTC_CLR);



	val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour;

	__raw_writel(val, rtc->rtc_reg + REG_RTC_TLR);



	return 0;

}



static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)

{

	struct nuc900_rtc *rtc = dev_get_drvdata(dev);

	unsigned int timeval, carval;



	timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR);

	carval	= __raw_readl(rtc->rtc_reg + REG_RTC_CAR);



	nuc900_rtc_bcd2bin(timeval, carval, &alrm->time);



	return 0;

}



static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)

{

	struct nuc900_rtc *rtc = dev_get_drvdata(dev);

	struct nuc900_bcd_time tm;

	unsigned long val;

	int *err;



	nuc900_rtc_bin2bcd(&alrm->time, &tm);



	err = check_rtc_access_enable(rtc);

	if (IS_ERR(err))

		return PTR_ERR(err);



	val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year;

	__raw_writel(val, rtc->rtc_reg + REG_RTC_CAR);



	val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour;

	__raw_writel(val, rtc->rtc_reg + REG_RTC_TAR);



	return 0;

}



static struct rtc_class_ops nuc900_rtc_ops = {

	.read_time = nuc900_rtc_read_time,

	.set_time = nuc900_rtc_set_time,

	.read_alarm = nuc900_rtc_read_alarm,

	.set_alarm = nuc900_rtc_set_alarm,

	.alarm_irq_enable = nuc900_alarm_irq_enable,

	.update_irq_enable = nuc900_update_irq_enable,

};



static int __devinit nuc900_rtc_probe(struct platform_device *pdev)

{

	struct resource *res;

	struct nuc900_rtc *nuc900_rtc;

	int err = 0;



	nuc900_rtc = kzalloc(sizeof(struct nuc900_rtc), GFP_KERNEL);

	if (!nuc900_rtc) {

		dev_err(&pdev->dev, "kzalloc nuc900_rtc failed\n");

		return -ENOMEM;

	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res) {

		dev_err(&pdev->dev, "platform_get_resource failed\n");

		err = -ENXIO;

		goto fail1;

	}



	if (!request_mem_region(res->start, resource_size(res),

				pdev->name)) {

		dev_err(&pdev->dev, "request_mem_region failed\n");

		err = -EBUSY;

		goto fail1;

	}



	nuc900_rtc->rtc_reg = ioremap(res->start, resource_size(res));

	if (!nuc900_rtc->rtc_reg) {

		dev_err(&pdev->dev, "ioremap rtc_reg failed\n");

		err = -ENOMEM;

		goto fail2;

	}



	nuc900_rtc->irq_num = platform_get_irq(pdev, 0);

	if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt,

				IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) {

		dev_err(&pdev->dev, "NUC900 RTC request irq failed\n");

		err = -EBUSY;

		goto fail3;

	}



	nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev,

						&nuc900_rtc_ops, THIS_MODULE);

	if (IS_ERR(nuc900_rtc->rtcdev)) {

		dev_err(&pdev->dev, "rtc device register faild\n");

		err = PTR_ERR(nuc900_rtc->rtcdev);

		goto fail4;

	}



	platform_set_drvdata(pdev, nuc900_rtc);

	__raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24,

					nuc900_rtc->rtc_reg + REG_RTC_TSSR);



	return 0;



fail4:	free_irq(nuc900_rtc->irq_num, nuc900_rtc);

fail3:	iounmap(nuc900_rtc->rtc_reg);

fail2:	release_mem_region(res->start, resource_size(res));

fail1:	kfree(nuc900_rtc);

	return err;

}



static int __devexit nuc900_rtc_remove(struct platform_device *pdev)

{

	struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev);

	struct resource *res;



	rtc_device_unregister(nuc900_rtc->rtcdev);

	free_irq(nuc900_rtc->irq_num, nuc900_rtc);

	iounmap(nuc900_rtc->rtc_reg);



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	release_mem_region(res->start, resource_size(res));



	kfree(nuc900_rtc);



	platform_set_drvdata(pdev, NULL);



	return 0;

}



static struct platform_driver nuc900_rtc_driver = {

	.remove		= __devexit_p(nuc900_rtc_remove),

	.driver		= {

		.name	= "nuc900-rtc",

		.owner	= THIS_MODULE,

	},

};



static int __init nuc900_rtc_init(void)

{

	return platform_driver_probe(&nuc900_rtc_driver, nuc900_rtc_probe);

}



static void __exit nuc900_rtc_exit(void)

{

	platform_driver_unregister(&nuc900_rtc_driver);

}



module_init(nuc900_rtc_init);

module_exit(nuc900_rtc_exit);



MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");

MODULE_DESCRIPTION("nuc910/nuc920 RTC driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:nuc900-rtc");