Commit 09d9327b authored by Ralf Baechle's avatar Ralf Baechle
Browse files

CHAR: Delete old and now unused M48T35 RTC driver for SGI IP27. 



It was only used by this one SGI platform which recently was converted to
RTC_LIB and with RTC_LIB enabled the legacy drivers are no more selectable.

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 4bdebe5b

arch/mips/configs/ip27_defconfig

+0 −1
Original line number Diff line number Diff line
@@ -701,7 +701,6 @@ CONFIG_LEGACY_PTY_COUNT=256 
# CONFIG_WATCHDOG is not set

CONFIG_HW_RANDOM=m

# CONFIG_RTC is not set

CONFIG_SGI_IP27_RTC=y

# CONFIG_R3964 is not set

# CONFIG_APPLICOM is not set

# CONFIG_DRM is not set

arch/mips/include/asm/m48t35.h

deleted100644 → 0
+0 −27
Original line number Diff line number Diff line 
/*

 *  Registers for the SGS-Thomson M48T35 Timekeeper RAM chip

 */

#ifndef _ASM_M48T35_H

#define _ASM_M48T35_H



#include <linux/spinlock.h>



extern spinlock_t rtc_lock;



struct m48t35_rtc {

	volatile u8	pad[0x7ff8];    /* starts at 0x7ff8 */

	volatile u8	control;

	volatile u8	sec;

	volatile u8	min;

	volatile u8	hour;

	volatile u8	day;

	volatile u8	date;

	volatile u8	month;

	volatile u8	year;

};



#define M48T35_RTC_SET		0x80

#define M48T35_RTC_STOPPED	0x80

#define M48T35_RTC_READ		0x40



#endif /* _ASM_M48T35_H */

drivers/char/Kconfig

+0 −11
Original line number Diff line number Diff line
@@ -812,17 +812,6 @@ config JS_RTC 
	  To compile this driver as a module, choose M here: the

	  module will be called js-rtc.



config SGI_IP27_RTC

	bool "SGI M48T35 RTC support"

	depends on SGI_IP27

	help

	  If you say Y here and create a character special file /dev/rtc with

	  major number 10 and minor number 135 using mknod ("man mknod"), you

	  will get access to the real time clock built into your computer.

	  Every SGI has such a clock built in. It reports status information

	  via the file /proc/rtc and its behaviour is set by various ioctls on

	  /dev/rtc.



config GEN_RTC

	tristate "Generic /dev/rtc emulation"

	depends on RTC!=y && !IA64 && !ARM && !M32R && !MIPS && !SPARC && !FRV && !S390 && !SUPERH && !AVR32

drivers/char/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -74,7 +74,6 @@ obj-$(CONFIG_RTC) += rtc.o 
obj-$(CONFIG_HPET)		+= hpet.o

obj-$(CONFIG_GEN_RTC)		+= genrtc.o

obj-$(CONFIG_EFI_RTC)		+= efirtc.o

obj-$(CONFIG_SGI_IP27_RTC)	+= ip27-rtc.o

obj-$(CONFIG_DS1302)		+= ds1302.o

obj-$(CONFIG_XILINX_HWICAP)	+= xilinx_hwicap/

ifeq ($(CONFIG_GENERIC_NVRAM),y)

drivers/char/ip27-rtc.c

deleted100644 → 0
+0 −329
Original line number Diff line number Diff line 
/*

 *	Driver for the SGS-Thomson M48T35 Timekeeper RAM chip

 *

 *	Real Time Clock interface for Linux

 *

 *	TODO: Implement periodic interrupts.

 *

 *	Copyright (C) 2000 Silicon Graphics, Inc.

 *	Written by Ulf Carlsson (ulfc@engr.sgi.com)

 *

 *	Based on code written by Paul Gortmaker.

 *

 *	This driver allows use of the real time clock (built into

 *	nearly all computers) from user space. It exports the /dev/rtc

 *	interface supporting various ioctl() and also the /proc/rtc

 *	pseudo-file for status information.

 *

 *	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; either version

 *	2 of the License, or (at your option) any later version.

 *

 */



#define RTC_VERSION		"1.09b"



#include <linux/bcd.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/smp_lock.h>

#include <linux/types.h>

#include <linux/miscdevice.h>

#include <linux/ioport.h>

#include <linux/fcntl.h>

#include <linux/rtc.h>

#include <linux/init.h>

#include <linux/poll.h>

#include <linux/proc_fs.h>



#include <asm/m48t35.h>

#include <asm/sn/ioc3.h>

#include <asm/io.h>

#include <asm/uaccess.h>

#include <asm/system.h>

#include <asm/sn/klconfig.h>

#include <asm/sn/sn0/ip27.h>

#include <asm/sn/sn0/hub.h>

#include <asm/sn/sn_private.h>



static long rtc_ioctl(struct file *filp, unsigned int cmd,

			unsigned long arg);



static int rtc_read_proc(char *page, char **start, off_t off,

                         int count, int *eof, void *data);



static void get_rtc_time(struct rtc_time *rtc_tm);



/*

 *	Bits in rtc_status. (6 bits of room for future expansion)

 */



#define RTC_IS_OPEN		0x01	/* means /dev/rtc is in use	*/

#define RTC_TIMER_ON		0x02	/* missed irq timer active	*/



static unsigned char rtc_status;	/* bitmapped status byte.	*/

static unsigned long rtc_freq;	/* Current periodic IRQ rate	*/

static struct m48t35_rtc *rtc;



/*

 *	If this driver ever becomes modularised, it will be really nice

 *	to make the epoch retain its value across module reload...

 */



static unsigned long epoch = 1970;	/* year corresponding to 0x00	*/



static const unsigned char days_in_mo[] =

{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};



static long rtc_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{



	struct rtc_time wtime;



	switch (cmd) {

	case RTC_RD_TIME:	/* Read the time/date from RTC	*/

	{

		get_rtc_time(&wtime);

		break;

	}

	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 -EACCES;



		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)

			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 -= epoch) > 255)    /* They are unsigned */

			return -EINVAL;



		if (yrs > 169)

			return -EINVAL;



		if (yrs >= 100)

			yrs -= 100;



		sec = bin2bcd(sec);

		min = bin2bcd(min);

		hrs = bin2bcd(hrs);

		day = bin2bcd(day);

		mon = bin2bcd(mon);

		yrs = bin2bcd(yrs);



		spin_lock_irq(&rtc_lock);

		rtc->control |= M48T35_RTC_SET;

		rtc->year = yrs;

		rtc->month = mon;

		rtc->date = day;

		rtc->hour = hrs;

		rtc->min = min;

		rtc->sec = sec;

		rtc->control &= ~M48T35_RTC_SET;

		spin_unlock_irq(&rtc_lock);



		return 0;

	}

	default:

		return -EINVAL;

	}

	return copy_to_user((void *)arg, &wtime, sizeof wtime) ? -EFAULT : 0;

}



/*

 *	We enforce only one user at a time here with the open/close.

 *	Also clear the previous interrupt data on an open, and clean

 *	up things on a close.

 */



static int rtc_open(struct inode *inode, struct file *file)

{

	lock_kernel();

	spin_lock_irq(&rtc_lock);



	if (rtc_status & RTC_IS_OPEN) {

		spin_unlock_irq(&rtc_lock);

		unlock_kernel();

		return -EBUSY;

	}



	rtc_status |= RTC_IS_OPEN;

	spin_unlock_irq(&rtc_lock);

	unlock_kernel();



	return 0;

}



static int rtc_release(struct inode *inode, struct file *file)

{

	/*

	 * Turn off all interrupts once the device is no longer

	 * in use, and clear the data.

	 */



	spin_lock_irq(&rtc_lock);

	rtc_status &= ~RTC_IS_OPEN;

	spin_unlock_irq(&rtc_lock);



	return 0;

}



/*

 *	The various file operations we support.

 */



static const struct file_operations rtc_fops = {

	.owner		= THIS_MODULE,

	.unlocked_ioctl	= rtc_ioctl,

	.open		= rtc_open,

	.release	= rtc_release,

};



static struct miscdevice rtc_dev=

{

	RTC_MINOR,

	"rtc",

	&rtc_fops

};



static int __init rtc_init(void)

{

	rtc = (struct m48t35_rtc *)

	(KL_CONFIG_CH_CONS_INFO(master_nasid)->memory_base + IOC3_BYTEBUS_DEV0);



	printk(KERN_INFO "Real Time Clock Driver v%s\n", RTC_VERSION);

	if (misc_register(&rtc_dev)) {

		printk(KERN_ERR "rtc: cannot register misc device.\n");

		return -ENODEV;

	}

	if (!create_proc_read_entry("driver/rtc", 0, NULL, rtc_read_proc, NULL)) {

		printk(KERN_ERR "rtc: cannot create /proc/rtc.\n");

		misc_deregister(&rtc_dev);

		return -ENOENT;

	}



	rtc_freq = 1024;



	return 0;

}



static void __exit rtc_exit (void)

{

	/* interrupts and timer disabled at this point by rtc_release */



	remove_proc_entry ("rtc", NULL);

	misc_deregister(&rtc_dev);

}



module_init(rtc_init);

module_exit(rtc_exit);



/*

 *	Info exported via "/proc/rtc".

 */



static int rtc_get_status(char *buf)

{

	char *p;

	struct rtc_time tm;



	/*

	 * Just emulate the standard /proc/rtc

	 */



	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"

	 	     "rtc_epoch\t: %04lu\n"

		     "24hr\t\t: yes\n",

		     tm.tm_hour, tm.tm_min, tm.tm_sec,

		     tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, epoch);



	return  p - buf;

}



static int rtc_read_proc(char *page, char **start, off_t off,

                                 int count, int *eof, void *data)

{

        int len = rtc_get_status(page);

        if (len <= off+count) *eof = 1;

        *start = page + off;

        len -= off;

        if (len>count) len = count;

        if (len<0) len = 0;

        return len;

}



static void get_rtc_time(struct rtc_time *rtc_tm)

{

	/*

	 * Do we need to wait for the last update to finish?

	 */



	/*

	 * Only the values that we read from the RTC are set. We leave

	 * tm_wday, tm_yday and tm_isdst untouched. Even though the

	 * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated

	 * by the RTC when initially set to a non-zero value.

	 */

	spin_lock_irq(&rtc_lock);

	rtc->control |= M48T35_RTC_READ;

	rtc_tm->tm_sec = rtc->sec;

	rtc_tm->tm_min = rtc->min;

	rtc_tm->tm_hour = rtc->hour;

	rtc_tm->tm_mday = rtc->date;

	rtc_tm->tm_mon = rtc->month;

	rtc_tm->tm_year = rtc->year;

	rtc->control &= ~M48T35_RTC_READ;

	spin_unlock_irq(&rtc_lock);



	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 += (epoch - 1900)) <= 69)

		rtc_tm->tm_year += 100;



	rtc_tm->tm_mon--;

}

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