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    Subject[PATCH V3] ARM: NUC900: add RTC driver support for nuc910 and nuc920
    Dear Alessandro,

    This is a fixed patch which was tested via rtc test program located in Documentation/rtc.txt.

    Thanks for your help.

    Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
    ---
    drivers/rtc/Kconfig | 6 +
    drivers/rtc/Makefile | 1 +
    drivers/rtc/rtc-nuc900.c | 334 ++++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 341 insertions(+), 0 deletions(-)
    create mode 100644 drivers/rtc/rtc-nuc900.c

    diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
    index 3c20dae..266ce62 100644
    --- a/drivers/rtc/Kconfig
    +++ b/drivers/rtc/Kconfig
    @@ -573,6 +573,12 @@ 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"

    diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
    index aa3fbd5..d511774 100644
    --- a/drivers/rtc/Makefile
    +++ b/drivers/rtc/Makefile
    @@ -53,6 +53,7 @@ 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_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
    diff --git a/drivers/rtc/rtc-nuc900.c b/drivers/rtc/rtc-nuc900.c
    new file mode 100644
    index 0000000..09383e2
    --- /dev/null
    +++ b/drivers/rtc/rtc-nuc900.c
    @@ -0,0 +1,334 @@
    +/*
    + * 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;
    + spinlock_t lock;
    +};
    +
    +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 void check_rtc_power(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 < 1000000; i++) {
    + if (__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB)
    + break;
    + }
    +}
    +
    +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;
    +
    + nuc900_rtc_bin2bcd(tm, &gettm);
    +
    + check_rtc_power(rtc);
    +
    + 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;
    +
    + nuc900_rtc_bin2bcd(&alrm->time, &tm);
    +
    + check_rtc_power(rtc);
    +
    + 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);
    +
    + dev_info(&pdev->dev, "NUC900 RTC device probe successfully\n");
    +
    + 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");
    --
    1.5.6.3

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