| /* | |
| * 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 NULL; | |
| } | |
| 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); | |
| } | |
| 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); | |
| 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; | |
| 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); | |
| nuc900_rtc_bcd2bin(timeval, carval, &alrm->time); | |
| return rtc_valid_tm(&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 const 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) | |
| 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", | |
| }, | |
| }; | |
| 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"); |