[PATCH V3] ARM: NUC900: add RTC driver support for nuc910 and nuc920
Alessandro Zummo
a.zummo at towertech.it
Wed Nov 25 08:38:21 EST 2009
On Wed, 25 Nov 2009 20:15:55 +0800
Wan ZongShun <mcuos.com at gmail.com> wrote:
> Dear Alessandro,
>
> This is a fixed patch which was tested via rtc test program located in Documentation/rtc.txt.
>
> Thanks for your help.
>
Hi, a few more notes below
> Signed-off-by: Wan ZongShun <mcuos.com at 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 at 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;
used?
> +};
> +
> +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");
no banners, rtc framwork will announce the rtc
> + 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),
__devexit_p is incoherent with the definition below
> + .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 at gmail.com>");
> +MODULE_DESCRIPTION("nuc910/nuc920 RTC driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:nuc900-rtc");
> --
> 1.5.6.3
--
Best regards,
Alessandro Zummo,
Tower Technologies - Torino, Italy
http://www.towertech.it
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