| /* |
| * 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/slab.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 timeout = 0x1000; |
| __raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR); |
| |
| mdelay(10); |
| |
| __raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER); |
| |
| while (!(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB) |
| && timeout--) |
| mdelay(1); |
| |
| if (!timeout) |
| return ERR_PTR(-EPERM); |
| |
| return 0; |
| } |
| |
| static int 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); |
| |
| return rtc_valid_tm(tm); |
| } |
| |
| static void nuc900_rtc_bin2bcd(struct device *dev, 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; |
| |
| if (settm->tm_year < 100) { |
| dev_warn(dev, "The year will be between 1970-1999, right?\n"); |
| gettm->bcd_year = bin2bcd(settm->tm_year) << 16; |
| } else { |
| 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_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); |
| |
| return nuc900_rtc_bcd2bin(timeval, clrval, tm); |
| } |
| |
| 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(dev, 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); |
| |
| return nuc900_rtc_bcd2bin(timeval, carval, &alrm->time); |
| } |
| |
| 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(dev, &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, |
| }; |
| |
| static int __init nuc900_rtc_probe(struct platform_device *pdev) |
| { |
| struct resource *res; |
| struct nuc900_rtc *nuc900_rtc; |
| |
| nuc900_rtc = devm_kzalloc(&pdev->dev, 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); |
| nuc900_rtc->rtc_reg = devm_ioremap_resource(&pdev->dev, res); |
| if (IS_ERR(nuc900_rtc->rtc_reg)) |
| return PTR_ERR(nuc900_rtc->rtc_reg); |
| |
| platform_set_drvdata(pdev, nuc900_rtc); |
| |
| nuc900_rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name, |
| &nuc900_rtc_ops, THIS_MODULE); |
| if (IS_ERR(nuc900_rtc->rtcdev)) { |
| dev_err(&pdev->dev, "rtc device register failed\n"); |
| return PTR_ERR(nuc900_rtc->rtcdev); |
| } |
| |
| __raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24, |
| nuc900_rtc->rtc_reg + REG_RTC_TSSR); |
| |
| nuc900_rtc->irq_num = platform_get_irq(pdev, 0); |
| if (devm_request_irq(&pdev->dev, nuc900_rtc->irq_num, |
| nuc900_rtc_interrupt, 0, "nuc900rtc", nuc900_rtc)) { |
| dev_err(&pdev->dev, "NUC900 RTC request irq failed\n"); |
| return -EBUSY; |
| } |
| |
| return 0; |
| } |
| |
| static struct platform_driver nuc900_rtc_driver = { |
| .driver = { |
| .name = "nuc900-rtc", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| module_platform_driver_probe(nuc900_rtc_driver, nuc900_rtc_probe); |
| |
| MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); |
| MODULE_DESCRIPTION("nuc910/nuc920 RTC driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:nuc900-rtc"); |
