[14/16] rtc: remove w90x900/nuc900 driver

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e72f65b61176..2805cbb32ade 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1247,13 +1247,6 @@  config RTC_DRV_AB8500
 	  Select this to enable the ST-Ericsson AB8500 power management IC RTC
 	  support. This chip contains a battery- and capacitor-backed RTC.
 
-config RTC_DRV_NUC900
-	tristate "NUC910/NUC920 RTC driver"
-	depends on ARCH_W90X900 || COMPILE_TEST
-	help
-	  If you say yes here you get support for the RTC subsystem of the
-	  NUC910/NUC920 used in embedded systems.
-
 config RTC_DRV_OPAL
 	tristate "IBM OPAL RTC driver"
 	depends on PPC_POWERNV
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 6b09c21dc1b6..9fe0e938272c 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -113,7 +113,6 @@  obj-$(CONFIG_RTC_DRV_MT7622)	+= rtc-mt7622.o
 obj-$(CONFIG_RTC_DRV_MV)	+= rtc-mv.o
 obj-$(CONFIG_RTC_DRV_MXC)	+= rtc-mxc.o
 obj-$(CONFIG_RTC_DRV_MXC_V2)	+= rtc-mxc_v2.o
-obj-$(CONFIG_RTC_DRV_NUC900)	+= rtc-nuc900.o
 obj-$(CONFIG_RTC_DRV_OMAP)	+= rtc-omap.o
 obj-$(CONFIG_RTC_DRV_OPAL)	+= rtc-opal.o
 obj-$(CONFIG_RTC_DRV_PALMAS)	+= rtc-palmas.o
diff --git a/drivers/rtc/rtc-nuc900.c b/drivers/rtc/rtc-nuc900.c
deleted file mode 100644
index 49cc4058614d..000000000000
--- a/drivers/rtc/rtc-nuc900.c
+++ /dev/null
@@ -1,271 +0,0 @@ 
-// 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");