+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2008-2009 Nuvoton technology corporation.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#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");
projects / platform / kernel / linux-rpi.git / commitdiff