Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
  CHAR: Delete old and now unused M48T35 RTC driver for SGI IP27.
  CHAR: Delete old and now unused DS1286 driver.
  MIPS: Sort out CPU type to name translation.
  MIPS: Use the new byteorder headers
  MIPS: Probe for watch registers on cores of all vendors, not just MTI.
  MIPS: Switch FPU emulator trap to BREAK instruction.
  MIPS: SMP: Do not initialize __cpu_number_map/__cpu_logical_map for CPU 0.
  MIPS: Consider value of c0_ebase when computing value of exception base.
  MIPS: Clean up MIPSxx-optimized bitop functions
  MIPS: New feature test macro cpu_has_mips_r
  MIPS: RBTX4927: Add GPIO-LED support
  MIPS: TXx9: Fix RBTX4939 ethernet address initialization

4 files changed, 0 insertions, 938 deletions

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 122254155ae1..43b35d0369d6 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -812,28 +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
-	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
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 1a4247dccac4..438f71317c5c 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -74,8 +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/
 ifeq ($(CONFIG_GENERIC_NVRAM),y)
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);
diff --git a/drivers/char/ip27-rtc.c b/drivers/char/ip27-rtc.c
deleted file mode 100644
index 2abd881b4cbc..000000000000
--- a/drivers/char/ip27-rtc.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*
- *	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--;
-}