patch-2.4.19 linux-2.4.19/arch/mips/philips/nino/time.c

• Lines: 217
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.18/arch/mips/philips/nino/time.c
• Orig date: Sun Sep 9 10:43:02 2001

diff -urN linux-2.4.18/arch/mips/philips/nino/time.c linux-2.4.19/arch/mips/philips/nino/time.c
@@ -1,216 +0,0 @@
-/*
- *  linux/arch/mips/philips/nino/time.c
- *
- *  Copyright (C) 1999 Harald Koerfgen
- *  Copyright (C) 2000 Pavel Machek (pavel@suse.cz)
- *  Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- *  Time handling functinos for Philips Nino.
- */
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/param.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/timex.h>
-#include <linux/delay.h>
-#include <asm/tx3912.h>
-
-extern volatile unsigned long wall_jiffies;
-extern rwlock_t xtime_lock;
-
-static struct timeval xbase;
-
-#define USECS_PER_JIFFY (1000000/HZ)
-
-/*
- * Poll the Interrupt Status Registers
- */
-#undef POLL_STATUS
-
-static unsigned long do_gettimeoffset(void)
-{
-    /*
-     * This is a kludge
-     */
-    return 0;
-}
-
-static
-void inline readRTC(unsigned long *high, unsigned long *low)
-{
-	/* read twice, and keep reading till we find two
-	 * the same pairs. This is needed in case the RTC
-	 * was updating its registers and we read a old
-	 * High but a new Low. */
-	do {
-		*high = RTChigh & RTC_HIGHMASK;
-		*low = RTClow;
-	} while (*high != (RTChigh & RTC_HIGHMASK) || RTClow!=*low);
-}
-
-/*
- * This version of gettimeofday has near millisecond resolution.
- */
-void do_gettimeofday(struct timeval *tv)
-{
-    unsigned long flags;
-    unsigned long high, low;
-
-    read_lock_irqsave(&xtime_lock, flags);
-    // 40 bit RTC, driven by 32khz source:
-    // +-----------+-----------------------------------------+
-    // | HHHH.HHHH | LLLL.LLLL.LLLL.LLLL.LMMM.MMMM.MMMM.MMMM |
-    // +-----------+-----------------------------------------+
-    readRTC(&high,&low);
-    tv->tv_sec  = (high << 17) | (low >> 15);
-    tv->tv_usec = (low % 32768) * 1953 / 64;
-    tv->tv_sec += xbase.tv_sec;
-    tv->tv_usec += xbase.tv_usec;
-
-    tv->tv_usec += do_gettimeoffset();
-
-    /*
-     * xtime is atomically updated in timer_bh. lost_ticks is
-     * nonzero if the timer bottom half hasnt executed yet.
-     */
-    if (jiffies - wall_jiffies)
-	tv->tv_usec += USECS_PER_JIFFY;
-
-    read_unlock_irqrestore(&xtime_lock, flags);
-
-    if (tv->tv_usec >= 1000000) {
-	tv->tv_usec -= 1000000;
-	tv->tv_sec++;
-    }
-}
-
-void do_settimeofday(struct timeval *tv)
-{
-    write_lock_irq(&xtime_lock);
-    /* This is revolting. We need to set the xtime.tv_usec
-     * correctly. However, the value in this location is
-     * is value at the last tick.
-     * Discover what correction gettimeofday
-     * would have done, and then undo it!
-     */
-    tv->tv_usec -= do_gettimeoffset();
-
-    if (tv->tv_usec < 0) {
-	tv->tv_usec += 1000000;
-	tv->tv_sec--;
-    }
-
-    /* reset RTC to 0 (real time is xbase + RTC) */
-    xbase = *tv;
-    RTCtimerControl |=  TIM_RTCCLEAR;
-    RTCtimerControl &= ~TIM_RTCCLEAR;
-    RTCalarmHigh = RTCalarmLow = ~0UL;
-
-    xtime = *tv;
-    time_state = TIME_BAD;
-    time_maxerror = MAXPHASE;
-    time_esterror = MAXPHASE;
-    write_unlock_irq(&xtime_lock);
-}
-
-static int set_rtc_mmss(unsigned long nowtime)
-{
-    int retval = 0;
-
-    return retval;
-}
-
-/* last time the cmos clock got updated */
-static long last_rtc_update = 0;
-
-/*
- * timer_interrupt() needs to keep up the real-time clock,
- * as well as call the "do_timer()" routine every clocktick
- */
-
-int do_write = 1;
-
-static void
-timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
-{
-#ifdef POLL_STATUS
-    static unsigned long old_IntStatus1 = 0;
-    static unsigned long old_IntStatus3 = 0;
-    static unsigned long old_IntStatus4 = 0;
-    static unsigned long old_IntStatus5 = 0;
-    static int counter = 0;
-    int i;
-
-    new_spircv = SPIData & 0xff;
-    if ((old_spircv != new_spircv) && (new_spircv != 0xff)) {
-	    printk( "SPIData changed: %x\n", new_spircv );
-    }
-    old_spircv = new_spircv;
-    if (do_write)
-	    SPIData = 0;
-#endif
-
-    if (!user_mode(regs)) {
-	if (prof_buffer && current->pid) {
-	    extern int _stext;
-	    unsigned long pc = regs->cp0_epc;
-
-	    pc -= (unsigned long) &_stext;
-	    pc >>= prof_shift;
-	    /*
-	     * Dont ignore out-of-bounds pc values silently,
-	     * put them into the last histogram slot, so if
-	     * present, they will show up as a sharp peak.
-	     */
-	    if (pc > prof_len - 1)
-		pc = prof_len - 1;
-		atomic_inc((atomic_t *) & prof_buffer[pc]);
-	    }
-    }
-
-    /*
-     * aaaand... action!
-     */
-    do_timer(regs);
-
-    /*
-     * If we have an externally syncronized Linux clock, then update
-     * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
-     * called as close as possible to 500 ms before the new second starts.
-     */
-    if (time_state != TIME_BAD && xtime.tv_sec > last_rtc_update + 660 &&
-	xtime.tv_usec > 500000 - (tick >> 1) &&
-	xtime.tv_usec < 500000 + (tick >> 1))
-    {
-	if (set_rtc_mmss(xtime.tv_sec) == 0)
-	    last_rtc_update = xtime.tv_sec;
-	else
-	    last_rtc_update = xtime.tv_sec - 600;  /* do it again in 60 s */
-    }
-}
-
-static struct irqaction irq0 = {timer_interrupt, SA_INTERRUPT, 0,
- 			 "timer", NULL, NULL};
-
-void (*board_time_init) (struct irqaction * irq);
-
-int __init time_init(void)
-{
-    struct timeval starttime;
-
-    starttime.tv_sec = mktime(2000, 1, 1, 0, 0, 0);
-    starttime.tv_usec = 0;
-    do_settimeofday(&starttime);
-
-    board_time_init(&irq0);
-
-    return 0;
-}