276 lines
6.8 KiB
C
276 lines
6.8 KiB
C
/*
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* Copyright (c) 2008-2009 Nuvoton technology corporation.
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*
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* Wan ZongShun <mcuos.com@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation;version 2 of the License.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/rtc.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/bcd.h>
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/* RTC Control Registers */
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#define REG_RTC_INIR 0x00
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#define REG_RTC_AER 0x04
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#define REG_RTC_FCR 0x08
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#define REG_RTC_TLR 0x0C
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#define REG_RTC_CLR 0x10
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#define REG_RTC_TSSR 0x14
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#define REG_RTC_DWR 0x18
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#define REG_RTC_TAR 0x1C
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#define REG_RTC_CAR 0x20
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#define REG_RTC_LIR 0x24
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#define REG_RTC_RIER 0x28
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#define REG_RTC_RIIR 0x2C
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#define REG_RTC_TTR 0x30
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#define RTCSET 0x01
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#define AERRWENB 0x10000
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#define INIRRESET 0xa5eb1357
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#define AERPOWERON 0xA965
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#define AERPOWEROFF 0x0000
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#define LEAPYEAR 0x0001
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#define TICKENB 0x80
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#define TICKINTENB 0x0002
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#define ALARMINTENB 0x0001
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#define MODE24 0x0001
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struct nuc900_rtc {
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int irq_num;
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void __iomem *rtc_reg;
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struct rtc_device *rtcdev;
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};
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struct nuc900_bcd_time {
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int bcd_sec;
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int bcd_min;
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int bcd_hour;
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int bcd_mday;
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int bcd_mon;
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int bcd_year;
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};
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static irqreturn_t nuc900_rtc_interrupt(int irq, void *_rtc)
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{
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struct nuc900_rtc *rtc = _rtc;
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unsigned long events = 0, rtc_irq;
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rtc_irq = __raw_readl(rtc->rtc_reg + REG_RTC_RIIR);
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if (rtc_irq & ALARMINTENB) {
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rtc_irq &= ~ALARMINTENB;
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__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
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events |= RTC_AF | RTC_IRQF;
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}
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if (rtc_irq & TICKINTENB) {
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rtc_irq &= ~TICKINTENB;
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__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
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events |= RTC_UF | RTC_IRQF;
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}
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rtc_update_irq(rtc->rtcdev, 1, events);
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return IRQ_HANDLED;
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}
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static int *check_rtc_access_enable(struct nuc900_rtc *nuc900_rtc)
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{
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unsigned int timeout = 0x1000;
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__raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR);
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mdelay(10);
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__raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER);
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while (!(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB)
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&& --timeout)
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mdelay(1);
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if (!timeout)
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return ERR_PTR(-EPERM);
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return NULL;
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}
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static void nuc900_rtc_bcd2bin(unsigned int timereg,
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unsigned int calreg, struct rtc_time *tm)
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{
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tm->tm_mday = bcd2bin(calreg >> 0);
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tm->tm_mon = bcd2bin(calreg >> 8);
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tm->tm_year = bcd2bin(calreg >> 16) + 100;
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tm->tm_sec = bcd2bin(timereg >> 0);
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tm->tm_min = bcd2bin(timereg >> 8);
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tm->tm_hour = bcd2bin(timereg >> 16);
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}
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static void nuc900_rtc_bin2bcd(struct device *dev, struct rtc_time *settm,
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struct nuc900_bcd_time *gettm)
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{
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gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0;
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gettm->bcd_mon = bin2bcd(settm->tm_mon) << 8;
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if (settm->tm_year < 100) {
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dev_warn(dev, "The year will be between 1970-1999, right?\n");
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gettm->bcd_year = bin2bcd(settm->tm_year) << 16;
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} else {
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gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16;
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}
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gettm->bcd_sec = bin2bcd(settm->tm_sec) << 0;
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gettm->bcd_min = bin2bcd(settm->tm_min) << 8;
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gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16;
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}
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static int nuc900_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct nuc900_rtc *rtc = dev_get_drvdata(dev);
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if (enabled)
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__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|
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(ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
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else
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__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)&
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(~ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
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return 0;
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}
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static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct nuc900_rtc *rtc = dev_get_drvdata(dev);
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unsigned int timeval, clrval;
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timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR);
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clrval = __raw_readl(rtc->rtc_reg + REG_RTC_CLR);
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nuc900_rtc_bcd2bin(timeval, clrval, tm);
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return 0;
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}
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static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct nuc900_rtc *rtc = dev_get_drvdata(dev);
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struct nuc900_bcd_time gettm;
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unsigned long val;
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int *err;
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nuc900_rtc_bin2bcd(dev, tm, &gettm);
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err = check_rtc_access_enable(rtc);
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if (IS_ERR(err))
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return PTR_ERR(err);
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val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year;
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__raw_writel(val, rtc->rtc_reg + REG_RTC_CLR);
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val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour;
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__raw_writel(val, rtc->rtc_reg + REG_RTC_TLR);
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return 0;
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}
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static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct nuc900_rtc *rtc = dev_get_drvdata(dev);
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unsigned int timeval, carval;
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timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR);
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carval = __raw_readl(rtc->rtc_reg + REG_RTC_CAR);
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nuc900_rtc_bcd2bin(timeval, carval, &alrm->time);
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return rtc_valid_tm(&alrm->time);
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}
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static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct nuc900_rtc *rtc = dev_get_drvdata(dev);
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struct nuc900_bcd_time tm;
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unsigned long val;
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int *err;
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nuc900_rtc_bin2bcd(dev, &alrm->time, &tm);
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err = check_rtc_access_enable(rtc);
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if (IS_ERR(err))
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return PTR_ERR(err);
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val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year;
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__raw_writel(val, rtc->rtc_reg + REG_RTC_CAR);
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val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour;
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__raw_writel(val, rtc->rtc_reg + REG_RTC_TAR);
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return 0;
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}
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static const struct rtc_class_ops nuc900_rtc_ops = {
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.read_time = nuc900_rtc_read_time,
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.set_time = nuc900_rtc_set_time,
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.read_alarm = nuc900_rtc_read_alarm,
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.set_alarm = nuc900_rtc_set_alarm,
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.alarm_irq_enable = nuc900_alarm_irq_enable,
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};
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static int __init nuc900_rtc_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct nuc900_rtc *nuc900_rtc;
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nuc900_rtc = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_rtc),
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GFP_KERNEL);
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if (!nuc900_rtc)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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nuc900_rtc->rtc_reg = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(nuc900_rtc->rtc_reg))
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return PTR_ERR(nuc900_rtc->rtc_reg);
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platform_set_drvdata(pdev, nuc900_rtc);
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nuc900_rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
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&nuc900_rtc_ops, THIS_MODULE);
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if (IS_ERR(nuc900_rtc->rtcdev)) {
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dev_err(&pdev->dev, "rtc device register failed\n");
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return PTR_ERR(nuc900_rtc->rtcdev);
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}
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__raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24,
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nuc900_rtc->rtc_reg + REG_RTC_TSSR);
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nuc900_rtc->irq_num = platform_get_irq(pdev, 0);
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if (devm_request_irq(&pdev->dev, nuc900_rtc->irq_num,
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nuc900_rtc_interrupt, 0, "nuc900rtc", nuc900_rtc)) {
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dev_err(&pdev->dev, "NUC900 RTC request irq failed\n");
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return -EBUSY;
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}
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return 0;
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}
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static struct platform_driver nuc900_rtc_driver = {
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.driver = {
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.name = "nuc900-rtc",
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},
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};
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module_platform_driver_probe(nuc900_rtc_driver, nuc900_rtc_probe);
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MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
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MODULE_DESCRIPTION("nuc910/nuc920 RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:nuc900-rtc");
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