Re: [PATCH V3] ARM: NUC900: add RTC driver support for nuc910 and nuc920
From: Hu Ruihuan
Date: Wed Nov 25 2009 - 07:51:36 EST
> 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@xxxxxxxxx>
> ---
> 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@xxxxxxxxx>
> + *
> + * 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;
> +}
I think you should lock irq before the serial read and write to the
REG_RTC_RIER register.
> +
> +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;
> +}
> +
ditto
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