Commit 59fc07b3 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

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: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 111f7503

drivers/char/Kconfig

+0 −9
Original line number Diff line number Diff line
@@ -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

+0 −1
Original line number Diff line number Diff line
@@ -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

deleted100644 → 0
+0 −357
Original line number Diff line number Diff line 
// 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);

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