Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 327 insertions, 0 deletions

diff --git a/drivers/char/ip27-rtc.c b/drivers/char/ip27-rtc.c
new file mode 100644
index 000000000000..3acdac3c967e
--- /dev/null
+++ b/drivers/char/ip27-rtc.c
@@ -0,0 +1,327 @@
+/*
+ *      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/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 <linux/smp_lock.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 int rtc_ioctl(struct inode *inode, struct file *file,
+                     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 int rtc_ioctl(struct inode *inode, struct file *file, 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)
+{
+        spin_lock_irq(&rtc_lock);
+
+        if (rtc_status & RTC_IS_OPEN) {
+                spin_unlock_irq(&rtc_lock);
+                return -EBUSY;
+        }
+
+        rtc_status |= RTC_IS_OPEN;
+        spin_unlock_irq(&rtc_lock);
+
+        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 struct file_operations rtc_fops = {
+        .owner          = THIS_MODULE,
+        .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--;
+}