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: Ralf Baechle <ralf@linux-mips.org>

5 files changed, 0 insertions, 369 deletions

diff --git a/arch/mips/configs/ip27_defconfig b/arch/mips/configs/ip27_defconfig
index 831d3e5a1ea6..34ea319be94c 100644
--- a/arch/mips/configs/ip27_defconfig
+++ b/arch/mips/configs/ip27_defconfig
@@ -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
diff --git a/arch/mips/include/asm/m48t35.h b/arch/mips/include/asm/m48t35.h
deleted file mode 100644
index f44852e9a96d..000000000000
--- a/arch/mips/include/asm/m48t35.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
- *  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 */
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 9d2c4364550c..43b35d0369d6 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_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 917f0f4faf79..438f71317c5c 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-$(CONFIG_SGI_IP27_RTC)      += ip27-rtc.o
 obj-$(CONFIG_DS1302)            += ds1302.o
 obj-$(CONFIG_XILINX_HWICAP)     += xilinx_hwicap/
 ifeq ($(CONFIG_GENERIC_NVRAM),y)
diff --git a/drivers/char/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--;
-}