ARM: NUC900: add RTC driver support for nuc910 and nuc920 (afd49a7e) · Commits · 戴 / test

drivers/rtc/Kconfig

+6 −0

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		@@ -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");

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