char: remove obsolete ds1302 rtc driver

The m32r architecture was the only user of the old-style
rtc driver for ds1302. The architecture is getting removed
now, and we have a modern driver for the same hardware in
drivers/rtc/rtc-ds1302.c, so this one won't be missed.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/char/Kconfig

@@ -346,15 +346,6 @@ config EFI_RTC
 	bool "EFI Real Time Clock Services"
 	depends on IA64
 
-config DS1302
-	tristate "DS1302 RTC support"
-	depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
-	help
-	  If you say Y here and create a character special file /dev/rtc with
-	  major number 121 and minor number 0 using mknod ("man mknod"), you
-	  will get access to the real time clock (or hardware clock) built
-	  into your computer.
-
 endif # RTC_LIB
 
 config DTLK

drivers/char/Makefile

@@ -26,7 +26,6 @@ obj-$(CONFIG_SONYPI)		+= sonypi.o
 obj-$(CONFIG_RTC)		+= rtc.o
 obj-$(CONFIG_HPET)		+= hpet.o
 obj-$(CONFIG_EFI_RTC)		+= efirtc.o
-obj-$(CONFIG_DS1302)		+= ds1302.o
 obj-$(CONFIG_XILINX_HWICAP)	+= xilinx_hwicap/
 ifeq ($(CONFIG_GENERIC_NVRAM),y)
   obj-$(CONFIG_NVRAM)	+= generic_nvram.o

drivers/char/ds1302.c

@@ -1,357 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*!***************************************************************************
-*!
-*! FILE NAME  : ds1302.c
-*!
-*! DESCRIPTION: Implements an interface for the DS1302 RTC
-*!
-*! Functions exported: ds1302_readreg, ds1302_writereg, ds1302_init, get_rtc_status
-*!
-*! ---------------------------------------------------------------------------
-*!
-*! (C) Copyright 1999, 2000, 2001  Axis Communications AB, LUND, SWEDEN
-*!
-*!***************************************************************************/
-
-
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/bcd.h>
-#include <linux/mutex.h>
-#include <linux/uaccess.h>
-#include <linux/io.h>
-
-#include <asm/rtc.h>
-#if defined(CONFIG_M32R)
-#include <asm/m32r.h>
-#endif
-
-#define RTC_MAJOR_NR 121 /* local major, change later */
-
-static DEFINE_MUTEX(rtc_mutex);
-static const char ds1302_name[] = "ds1302";
-
-/* Send 8 bits. */
-static void
-out_byte_rtc(unsigned int reg_addr, unsigned char x)
-{
-	//RST H
-	outw(0x0001,(unsigned long)PLD_RTCRSTODT);
-	//write data
-	outw(((x<<8)|(reg_addr&0xff)),(unsigned long)PLD_RTCWRDATA);
-	//WE
-	outw(0x0002,(unsigned long)PLD_RTCCR);
-	//wait
-	while(inw((unsigned long)PLD_RTCCR));
-
-	//RST L
-	outw(0x0000,(unsigned long)PLD_RTCRSTODT);
-
-}
-
-static unsigned char
-in_byte_rtc(unsigned int reg_addr)
-{
-	unsigned char retval;
-
-	//RST H
-	outw(0x0001,(unsigned long)PLD_RTCRSTODT);
-	//write data
-	outw((reg_addr&0xff),(unsigned long)PLD_RTCRDDATA);
-	//RE
-	outw(0x0001,(unsigned long)PLD_RTCCR);
-	//wait
-	while(inw((unsigned long)PLD_RTCCR));
-
-	//read data
-	retval=(inw((unsigned long)PLD_RTCRDDATA) & 0xff00)>>8;
-
-	//RST L
-	outw(0x0000,(unsigned long)PLD_RTCRSTODT);
-
-	return retval;
-}
-
-/* Enable writing. */
-
-static void
-ds1302_wenable(void)
-{
-	out_byte_rtc(0x8e,0x00);
-}
-
-/* Disable writing. */
-
-static void
-ds1302_wdisable(void)
-{
-	out_byte_rtc(0x8e,0x80);
-}
-
-
-
-/* Read a byte from the selected register in the DS1302. */
-
-unsigned char
-ds1302_readreg(int reg)
-{
-	unsigned char x;
-
-	x=in_byte_rtc((0x81 | (reg << 1))); /* read register */
-
-	return x;
-}
-
-/* Write a byte to the selected register. */
-
-void
-ds1302_writereg(int reg, unsigned char val)
-{
-	ds1302_wenable();
-	out_byte_rtc((0x80 | (reg << 1)),val);
-	ds1302_wdisable();
-}
-
-void
-get_rtc_time(struct rtc_time *rtc_tm)
-{
-	unsigned long flags;
-
-	local_irq_save(flags);
-
-	rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS);
-	rtc_tm->tm_min = CMOS_READ(RTC_MINUTES);
-	rtc_tm->tm_hour = CMOS_READ(RTC_HOURS);
-	rtc_tm->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
-	rtc_tm->tm_mon = CMOS_READ(RTC_MONTH);
-	rtc_tm->tm_year = CMOS_READ(RTC_YEAR);
-
-	local_irq_restore(flags);
-
-	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
-	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
-	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
-	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
-	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
-	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
-
-	/*
-	 * Account for differences between how the RTC uses the values
-	 * and how they are defined in a struct rtc_time;
-	 */
-
-	if (rtc_tm->tm_year <= 69)
-		rtc_tm->tm_year += 100;
-
-	rtc_tm->tm_mon--;
-}
-
-static unsigned char days_in_mo[] =
-    {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
-
-/* ioctl that supports RTC_RD_TIME and RTC_SET_TIME (read and set time/date). */
-
-static long rtc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-	unsigned long flags;
-
-	switch(cmd) {
-		case RTC_RD_TIME:	/* read the time/date from RTC	*/
-		{
-			struct rtc_time rtc_tm;
-
-			memset(&rtc_tm, 0, sizeof (struct rtc_time));
-			mutex_lock(&rtc_mutex);
-			get_rtc_time(&rtc_tm);
-			mutex_unlock(&rtc_mutex);
-			if (copy_to_user((struct rtc_time*)arg, &rtc_tm, sizeof(struct rtc_time)))
-				return -EFAULT;
-			return 0;
-		}
-
-		case RTC_SET_TIME:	/* set the RTC */
-		{
-			struct rtc_time rtc_tm;
-			unsigned char mon, day, hrs, min, sec, leap_yr;
-			unsigned int yrs;
-
-			if (!capable(CAP_SYS_TIME))
-				return -EPERM;
-
-			if (copy_from_user(&rtc_tm, (struct rtc_time*)arg, sizeof(struct rtc_time)))
-				return -EFAULT;
-
-			yrs = rtc_tm.tm_year + 1900;
-			mon = rtc_tm.tm_mon + 1;   /* tm_mon starts at zero */
-			day = rtc_tm.tm_mday;
-			hrs = rtc_tm.tm_hour;
-			min = rtc_tm.tm_min;
-			sec = rtc_tm.tm_sec;
-
-
-			if ((yrs < 1970) || (yrs > 2069))
-				return -EINVAL;
-
-			leap_yr = ((!(yrs % 4) && (yrs % 100)) || !(yrs % 400));
-
-			if ((mon > 12) || (day == 0))
-				return -EINVAL;
-
-			if (day > (days_in_mo[mon] + ((mon == 2) && leap_yr)))
-				return -EINVAL;
-
-			if ((hrs >= 24) || (min >= 60) || (sec >= 60))
-				return -EINVAL;
-
-			if (yrs >= 2000)
-				yrs -= 2000;	/* RTC (0, 1, ... 69) */
-			else
-				yrs -= 1900;	/* RTC (70, 71, ... 99) */
-
-			sec = bin2bcd(sec);
-			min = bin2bcd(min);
-			hrs = bin2bcd(hrs);
-			day = bin2bcd(day);
-			mon = bin2bcd(mon);
-			yrs = bin2bcd(yrs);
-
-			mutex_lock(&rtc_mutex);
-			local_irq_save(flags);
-			CMOS_WRITE(yrs, RTC_YEAR);
-			CMOS_WRITE(mon, RTC_MONTH);
-			CMOS_WRITE(day, RTC_DAY_OF_MONTH);
-			CMOS_WRITE(hrs, RTC_HOURS);
-			CMOS_WRITE(min, RTC_MINUTES);
-			CMOS_WRITE(sec, RTC_SECONDS);
-			local_irq_restore(flags);
-			mutex_unlock(&rtc_mutex);
-
-			/* Notice that at this point, the RTC is updated but
-			 * the kernel is still running with the old time.
-			 * You need to set that separately with settimeofday
-			 * or adjtimex.
-			 */
-			return 0;
-		}
-
-		case RTC_SET_CHARGE: /* set the RTC TRICKLE CHARGE register */
-		{
-			int tcs_val;
-
-			if (!capable(CAP_SYS_TIME))
-				return -EPERM;
-
-			if(copy_from_user(&tcs_val, (int*)arg, sizeof(int)))
-				return -EFAULT;
-
-			mutex_lock(&rtc_mutex);
-			tcs_val = RTC_TCR_PATTERN | (tcs_val & 0x0F);
-			ds1302_writereg(RTC_TRICKLECHARGER, tcs_val);
-			mutex_unlock(&rtc_mutex);
-			return 0;
-		}
-		default:
-			return -EINVAL;
-	}
-}
-
-int
-get_rtc_status(char *buf)
-{
-	char *p;
-	struct rtc_time tm;
-
-	p = buf;
-
-	get_rtc_time(&tm);
-
-	/*
-	 * There is no way to tell if the luser has the RTC set for local
-	 * time or for Universal Standard Time (GMT). Probably local though.
-	 */
-
-	p += sprintf(p,
-		"rtc_time\t: %02d:%02d:%02d\n"
-		"rtc_date\t: %04d-%02d-%02d\n",
-		tm.tm_hour, tm.tm_min, tm.tm_sec,
-		tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
-
-	return  p - buf;
-}
-
-
-/* The various file operations we support. */
-
-static const struct file_operations rtc_fops = {
-	.owner		= THIS_MODULE,
-	.unlocked_ioctl	= rtc_ioctl,
-	.llseek		= noop_llseek,
-};
-
-/* Probe for the chip by writing something to its RAM and try reading it back. */
-
-#define MAGIC_PATTERN 0x42
-
-static int __init
-ds1302_probe(void)
-{
-	int retval, res, baur;
-
-	baur=(boot_cpu_data.bus_clock/(2*1000*1000));
-
-	printk("%s: Set PLD_RTCBAUR = %d\n", ds1302_name,baur);
-
-	outw(0x0000,(unsigned long)PLD_RTCCR);
-	outw(0x0000,(unsigned long)PLD_RTCRSTODT);
-	outw(baur,(unsigned long)PLD_RTCBAUR);
-
-	/* Try to talk to timekeeper. */
-
-	ds1302_wenable();
-	/* write RAM byte 0 */
-	/* write something magic */
-	out_byte_rtc(0xc0,MAGIC_PATTERN);
-
-	/* read RAM byte 0 */
-	if((res = in_byte_rtc(0xc1)) == MAGIC_PATTERN) {
-		char buf[100];
-		ds1302_wdisable();
-		printk("%s: RTC found.\n", ds1302_name);
-		get_rtc_status(buf);
-		printk(buf);
-		retval = 1;
-	} else {
-		printk("%s: RTC not found.\n", ds1302_name);
-		retval = 0;
-	}
-
-	return retval;
-}
-
-
-/* Just probe for the RTC and register the device to handle the ioctl needed. */
-
-int __init
-ds1302_init(void)
-{
-	if (!ds1302_probe()) {
-		return -1;
-  	}
-	return 0;
-}
-
-static int __init ds1302_register(void)
-{
-	ds1302_init();
-	if (register_chrdev(RTC_MAJOR_NR, ds1302_name, &rtc_fops)) {
-		printk(KERN_INFO "%s: unable to get major %d for rtc\n",
-		       ds1302_name, RTC_MAJOR_NR);
-		return -1;
-	}
-	return 0;
-}
-
-module_init(ds1302_register);