CHAR: Delete old and now unused DS1286 driver.

It was only used by two SGI platforms which recently were converted to
RTC_LIB and with RTC_LIB enabled the legacy drivers are no more selectable.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>

3 files changed, 0 insertions, 597 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 122254155ae1..9d2c4364550c 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -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_DS1286
-	tristate "SGI DS1286 RTC support"
-	depends on SGI_HAS_DS1286
-	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 SGI_IP27_RTC
 	bool "SGI M48T35 RTC support"
 	depends on SGI_IP27
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 1a4247dccac4..917f0f4faf79 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -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-$(CONFIG_SGI_DS1286)	+= ds1286.o
 obj-$(CONFIG_SGI_IP27_RTC)	+= ip27-rtc.o
 obj-$(CONFIG_DS1302)		+= ds1302.o
 obj-$(CONFIG_XILINX_HWICAP)	+= xilinx_hwicap/
diff --git a/drivers/char/ds1286.c b/drivers/char/ds1286.c
deleted file mode 100644
index 0a826d7be10e..000000000000
--- a/drivers/char/ds1286.c
+++ /dev/null
@@ -1,585 +0,0 @@
-/*
- * DS1286 Real Time Clock interface for Linux
- *
- * Copyright (C) 1998, 1999, 2000 Ralf Baechle
- *
- * 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.
- *
- * The ioctls can be used to set the interrupt behaviour and generation rate
- * from the RTC via IRQ 8. Then the /dev/rtc interface can be used to make
- * use of these timer interrupts, be they interval or alarm based.
- *
- * The /dev/rtc interface will block on reads until an interrupt has been
- * received. If a RTC interrupt has already happened, it will output an
- * unsigned long and then block. The output value contains the interrupt
- * status in the low byte and the number of interrupts since the last read
- * in the remaining high bytes. The /dev/rtc interface can also be used with
- * the select(2) call.
- *
- * 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.
- */
-#include <linux/ds1286.h>
-#include <linux/smp_lock.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/miscdevice.h>
-#include <linux/slab.h>
-#include <linux/ioport.h>
-#include <linux/fcntl.h>
-#include <linux/init.h>
-#include <linux/poll.h>
-#include <linux/rtc.h>
-#include <linux/spinlock.h>
-#include <linux/bcd.h>
-#include <linux/proc_fs.h>
-#include <linux/jiffies.h>
-
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-#define DS1286_VERSION		"1.0"
-
-/*
- *	We sponge a minor off of the misc major. No need slurping
- *	up another valuable major dev number for this. If you add
- *	an ioctl, make sure you don't conflict with SPARC's RTC
- *	ioctls.
- */
-
-static DECLARE_WAIT_QUEUE_HEAD(ds1286_wait);
-
-static ssize_t ds1286_read(struct file *file, char *buf,
-			size_t count, loff_t *ppos);
-
-static int ds1286_ioctl(struct inode *inode, struct file *file,
-                        unsigned int cmd, unsigned long arg);
-
-static unsigned int ds1286_poll(struct file *file, poll_table *wait);
-
-static void ds1286_get_alm_time (struct rtc_time *alm_tm);
-static void ds1286_get_time(struct rtc_time *rtc_tm);
-static int ds1286_set_time(struct rtc_time *rtc_tm);
-
-static inline unsigned char ds1286_is_updating(void);
-
-static DEFINE_SPINLOCK(ds1286_lock);
-
-static int ds1286_read_proc(char *page, char **start, off_t off,
-                            int count, int *eof, void *data);
-
-/*
- *	Bits in rtc_status. (7 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 ds1286_status;	/* bitmapped status byte.	*/
-
-static unsigned char days_in_mo[] = {
-	0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-};
-
-/*
- *	Now all the various file operations that we export.
- */
-
-static ssize_t ds1286_read(struct file *file, char *buf,
-                           size_t count, loff_t *ppos)
-{
-	return -EIO;
-}
-
-static int ds1286_ioctl(struct inode *inode, struct file *file,
-                        unsigned int cmd, unsigned long arg)
-{
-	struct rtc_time wtime;
-
-	switch (cmd) {
-	case RTC_AIE_OFF:	/* Mask alarm int. enab. bit	*/
-	{
-		unsigned long flags;
-		unsigned char val;
-
-		if (!capable(CAP_SYS_TIME))
-			return -EACCES;
-
-		spin_lock_irqsave(&ds1286_lock, flags);
-		val = rtc_read(RTC_CMD);
-		val |=  RTC_TDM;
-		rtc_write(val, RTC_CMD);
-		spin_unlock_irqrestore(&ds1286_lock, flags);
-
-		return 0;
-	}
-	case RTC_AIE_ON:	/* Allow alarm interrupts.	*/
-	{
-		unsigned long flags;
-		unsigned char val;
-
-		if (!capable(CAP_SYS_TIME))
-			return -EACCES;
-
-		spin_lock_irqsave(&ds1286_lock, flags);
-		val = rtc_read(RTC_CMD);
-		val &=  ~RTC_TDM;
-		rtc_write(val, RTC_CMD);
-		spin_unlock_irqrestore(&ds1286_lock, flags);
-
-		return 0;
-	}
-	case RTC_WIE_OFF:	/* Mask watchdog int. enab. bit	*/
-	{
-		unsigned long flags;
-		unsigned char val;
-
-		if (!capable(CAP_SYS_TIME))
-			return -EACCES;
-
-		spin_lock_irqsave(&ds1286_lock, flags);
-		val = rtc_read(RTC_CMD);
-		val |= RTC_WAM;
-		rtc_write(val, RTC_CMD);
-		spin_unlock_irqrestore(&ds1286_lock, flags);
-
-		return 0;
-	}
-	case RTC_WIE_ON:	/* Allow watchdog interrupts.	*/
-	{
-		unsigned long flags;
-		unsigned char val;
-
-		if (!capable(CAP_SYS_TIME))
-			return -EACCES;
-
-		spin_lock_irqsave(&ds1286_lock, flags);
-		val = rtc_read(RTC_CMD);
-		val &= ~RTC_WAM;
-		rtc_write(val, RTC_CMD);
-		spin_unlock_irqrestore(&ds1286_lock, flags);
-
-		return 0;
-	}
-	case RTC_ALM_READ:	/* Read the present alarm time */
-	{
-		/*
-		 * This returns a struct rtc_time. Reading >= 0xc0
-		 * means "don't care" or "match all". Only the tm_hour,
-		 * tm_min, and tm_sec values are filled in.
-		 */
-
-		memset(&wtime, 0, sizeof(wtime));
-		ds1286_get_alm_time(&wtime);
-		break;
-	}
-	case RTC_ALM_SET:	/* Store a time into the alarm */
-	{
-		/*
-		 * This expects a struct rtc_time. Writing 0xff means
-		 * "don't care" or "match all". Only the tm_hour,
-		 * tm_min and tm_sec are used.
-		 */
-		unsigned char hrs, min, sec;
-		struct rtc_time alm_tm;
-
-		if (!capable(CAP_SYS_TIME))
-			return -EACCES;
-
-		if (copy_from_user(&alm_tm, (struct rtc_time*)arg,
-				   sizeof(struct rtc_time)))
-			return -EFAULT;
-
-		hrs = alm_tm.tm_hour;
-		min = alm_tm.tm_min;
-		sec = alm_tm.tm_sec;
-
-		if (hrs >= 24)
-			hrs = 0xff;
-
-		if (min >= 60)
-			min = 0xff;
-
-		if (sec != 0)
-			return -EINVAL;
-
-		min = bin2bcd(min);
-		min = bin2bcd(hrs);
-
-		spin_lock(&ds1286_lock);
-		rtc_write(hrs, RTC_HOURS_ALARM);
-		rtc_write(min, RTC_MINUTES_ALARM);
-		spin_unlock(&ds1286_lock);
-
-		return 0;
-	}
-	case RTC_RD_TIME:	/* Read the time/date from RTC	*/
-	{
-		memset(&wtime, 0, sizeof(wtime));
-		ds1286_get_time(&wtime);
-		break;
-	}
-	case RTC_SET_TIME:	/* Set the RTC */
-	{
-		struct rtc_time rtc_tm;
-
-		if (!capable(CAP_SYS_TIME))
-			return -EACCES;
-
-		if (copy_from_user(&rtc_tm, (struct rtc_time*)arg,
-				   sizeof(struct rtc_time)))
-			return -EFAULT;
-
-		return ds1286_set_time(&rtc_tm);
-	}
-	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 ds1286_open(struct inode *inode, struct file *file)
-{
-	lock_kernel();
-	spin_lock_irq(&ds1286_lock);
-
-	if (ds1286_status & RTC_IS_OPEN)
-		goto out_busy;
-
-	ds1286_status |= RTC_IS_OPEN;
-
-	spin_unlock_irq(&ds1286_lock);
-	unlock_kernel();
-	return 0;
-
-out_busy:
-	spin_lock_irq(&ds1286_lock);
-	unlock_kernel();
-	return -EBUSY;
-}
-
-static int ds1286_release(struct inode *inode, struct file *file)
-{
-	ds1286_status &= ~RTC_IS_OPEN;
-
-	return 0;
-}
-
-static unsigned int ds1286_poll(struct file *file, poll_table *wait)
-{
-	poll_wait(file, &ds1286_wait, wait);
-
-	return 0;
-}
-
-/*
- *	The various file operations we support.
- */
-
-static const struct file_operations ds1286_fops = {
-	.llseek		= no_llseek,
-	.read		= ds1286_read,
-	.poll		= ds1286_poll,
-	.ioctl		= ds1286_ioctl,
-	.open		= ds1286_open,
-	.release	= ds1286_release,
-};
-
-static struct miscdevice ds1286_dev=
-{
-	.minor	= RTC_MINOR,
-	.name	= "rtc",
-	.fops	= &ds1286_fops,
-};
-
-static int __init ds1286_init(void)
-{
-	int err;
-
-	printk(KERN_INFO "DS1286 Real Time Clock Driver v%s\n", DS1286_VERSION);
-
-	err = misc_register(&ds1286_dev);
-	if (err)
-		goto out;
-
-	if (!create_proc_read_entry("driver/rtc", 0, 0, ds1286_read_proc, NULL)) {
-		err = -ENOMEM;
-
-		goto out_deregister;
-	}
-
-	return 0;
-
-out_deregister:
-	misc_deregister(&ds1286_dev);
-
-out:
-	return err;
-}
-
-static void __exit ds1286_exit(void)
-{
-	remove_proc_entry("driver/rtc", NULL);
-	misc_deregister(&ds1286_dev);
-}
-
-static char *days[] = {
-	"***", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
-};
-
-/*
- *	Info exported via "/proc/rtc".
- */
-static int ds1286_proc_output(char *buf)
-{
-	char *p, *s;
-	struct rtc_time tm;
-	unsigned char hundredth, month, cmd, amode;
-
-	p = buf;
-
-	ds1286_get_time(&tm);
-	hundredth = rtc_read(RTC_HUNDREDTH_SECOND);
-	hundredth = bcd2bin(hundredth);
-
-	p += sprintf(p,
-	             "rtc_time\t: %02d:%02d:%02d.%02d\n"
-	             "rtc_date\t: %04d-%02d-%02d\n",
-		     tm.tm_hour, tm.tm_min, tm.tm_sec, hundredth,
-		     tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
-
-	/*
-	 * We implicitly assume 24hr mode here. Alarm values >= 0xc0 will
-	 * match any value for that particular field. Values that are
-	 * greater than a valid time, but less than 0xc0 shouldn't appear.
-	 */
-	ds1286_get_alm_time(&tm);
-	p += sprintf(p, "alarm\t\t: %s ", days[tm.tm_wday]);
-	if (tm.tm_hour <= 24)
-		p += sprintf(p, "%02d:", tm.tm_hour);
-	else
-		p += sprintf(p, "**:");
-
-	if (tm.tm_min <= 59)
-		p += sprintf(p, "%02d\n", tm.tm_min);
-	else
-		p += sprintf(p, "**\n");
-
-	month = rtc_read(RTC_MONTH);
-	p += sprintf(p,
-	             "oscillator\t: %s\n"
-	             "square_wave\t: %s\n",
-	             (month & RTC_EOSC) ? "disabled" : "enabled",
-	             (month & RTC_ESQW) ? "disabled" : "enabled");
-
-	amode = ((rtc_read(RTC_MINUTES_ALARM) & 0x80) >> 5) |
-	        ((rtc_read(RTC_HOURS_ALARM) & 0x80) >> 6) |
-	        ((rtc_read(RTC_DAY_ALARM) & 0x80) >> 7);
-	if (amode == 7)      s = "each minute";
-	else if (amode == 3) s = "minutes match";
-	else if (amode == 1) s = "hours and minutes match";
-	else if (amode == 0) s = "days, hours and minutes match";
-	else                 s = "invalid";
-	p += sprintf(p, "alarm_mode\t: %s\n", s);
-
-	cmd = rtc_read(RTC_CMD);
-	p += sprintf(p,
-	             "alarm_enable\t: %s\n"
-	             "wdog_alarm\t: %s\n"
-	             "alarm_mask\t: %s\n"
-	             "wdog_alarm_mask\t: %s\n"
-	             "interrupt_mode\t: %s\n"
-	             "INTB_mode\t: %s_active\n"
-	             "interrupt_pins\t: %s\n",
-		     (cmd & RTC_TDF) ? "yes" : "no",
-		     (cmd & RTC_WAF) ? "yes" : "no",
-		     (cmd & RTC_TDM) ? "disabled" : "enabled",
-		     (cmd & RTC_WAM) ? "disabled" : "enabled",
-		     (cmd & RTC_PU_LVL) ? "pulse" : "level",
-		     (cmd & RTC_IBH_LO) ? "low" : "high",
-	             (cmd & RTC_IPSW) ? "unswapped" : "swapped");
-
-	return  p - buf;
-}
-
-static int ds1286_read_proc(char *page, char **start, off_t off,
-                         int count, int *eof, void *data)
-{
-	int len = ds1286_proc_output (page);
-	if (len <= off+count) *eof = 1;
-	*start = page + off;
-	len -= off;
-	if (len>count)
-		len = count;
-	if (len<0)
-		len = 0;
-
-	return len;
-}
-
-/*
- * Returns true if a clock update is in progress
- */
-static inline unsigned char ds1286_is_updating(void)
-{
-	return rtc_read(RTC_CMD) & RTC_TE;
-}
-
-
-static void ds1286_get_time(struct rtc_time *rtc_tm)
-{
-	unsigned char save_control;
-	unsigned long flags;
-
-	/*
-	 * read RTC once any update in progress is done. The update
-	 * can take just over 2ms. We wait 10 to 20ms. There is no need to
-	 * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
-	 * If you need to know *exactly* when a second has started, enable
-	 * periodic update complete interrupts, (via ioctl) and then
-	 * immediately read /dev/rtc which will block until you get the IRQ.
-	 * Once the read clears, read the RTC time (again via ioctl). Easy.
-	 */
-
-	if (ds1286_is_updating() != 0)
-		msleep(20);
-
-	/*
-	 * 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_irqsave(&ds1286_lock, flags);
-	save_control = rtc_read(RTC_CMD);
-	rtc_write((save_control|RTC_TE), RTC_CMD);
-
-	rtc_tm->tm_sec = rtc_read(RTC_SECONDS);
-	rtc_tm->tm_min = rtc_read(RTC_MINUTES);
-	rtc_tm->tm_hour = rtc_read(RTC_HOURS) & 0x3f;
-	rtc_tm->tm_mday = rtc_read(RTC_DATE);
-	rtc_tm->tm_mon = rtc_read(RTC_MONTH) & 0x1f;
-	rtc_tm->tm_year = rtc_read(RTC_YEAR);
-
-	rtc_write(save_control, RTC_CMD);
-	spin_unlock_irqrestore(&ds1286_lock, 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 < 45)
-		rtc_tm->tm_year += 30;
-	if ((rtc_tm->tm_year += 40) < 70)
-		rtc_tm->tm_year += 100;
-
-	rtc_tm->tm_mon--;
-}
-
-static int ds1286_set_time(struct rtc_time *rtc_tm)
-{
-	unsigned char mon, day, hrs, min, sec, leap_yr;
-	unsigned char save_control;
-	unsigned int yrs;
-	unsigned long flags;
-
-
-	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 -= 1940) > 255)    /* They are unsigned */
-		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_irqsave(&ds1286_lock, flags);
-	save_control = rtc_read(RTC_CMD);
-	rtc_write((save_control|RTC_TE), RTC_CMD);
-
-	rtc_write(yrs, RTC_YEAR);
-	rtc_write(mon, RTC_MONTH);
-	rtc_write(day, RTC_DATE);
-	rtc_write(hrs, RTC_HOURS);
-	rtc_write(min, RTC_MINUTES);
-	rtc_write(sec, RTC_SECONDS);
-	rtc_write(0, RTC_HUNDREDTH_SECOND);
-
-	rtc_write(save_control, RTC_CMD);
-	spin_unlock_irqrestore(&ds1286_lock, flags);
-
-	return 0;
-}
-
-static void ds1286_get_alm_time(struct rtc_time *alm_tm)
-{
-	unsigned char cmd;
-	unsigned long flags;
-
-	/*
-	 * Only the values that we read from the RTC are set. That
-	 * means only tm_wday, tm_hour, tm_min.
-	 */
-	spin_lock_irqsave(&ds1286_lock, flags);
-	alm_tm->tm_min = rtc_read(RTC_MINUTES_ALARM) & 0x7f;
-	alm_tm->tm_hour = rtc_read(RTC_HOURS_ALARM)  & 0x1f;
-	alm_tm->tm_wday = rtc_read(RTC_DAY_ALARM)    & 0x07;
-	cmd = rtc_read(RTC_CMD);
-	spin_unlock_irqrestore(&ds1286_lock, flags);
-
-	alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
-	alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
-	alm_tm->tm_sec = 0;
-}
-
-module_init(ds1286_init);
-module_exit(ds1286_exit);
-
-MODULE_AUTHOR("Ralf Baechle");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(RTC_MINOR);