1 files changed, 318 insertions, 0 deletions

diff --git a/arch/m32r/kernel/time.c b/arch/m32r/kernel/time.c
new file mode 100644
index 000000000000..3c4707280a52
--- /dev/null
+++ b/arch/m32r/kernel/time.c
@@ -0,0 +1,318 @@
+/*
+ *  linux/arch/m32r/kernel/time.c
+ *
+ *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
+ *                            Hitoshi Yamamoto
+ *  Taken from i386 version.
+ *    Copyright (C) 1991, 1992, 1995  Linus Torvalds
+ *    Copyright (C) 1996, 1997, 1998  Ralf Baechle
+ *
+ *  This file contains the time handling details for PC-style clocks as
+ *  found in some MIPS systems.
+ *
+ *  Some code taken from sh version.
+ *    Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
+ *    Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
+ */
+
+#undef  DEBUG_TIMER
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.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/profile.h>
+
+#include <asm/io.h>
+#include <asm/m32r.h>
+
+#include <asm/hw_irq.h>
+
+#ifdef CONFIG_SMP
+extern void send_IPI_allbutself(int, int);
+extern void smp_local_timer_interrupt(struct pt_regs *);
+#endif
+
+u64 jiffies_64 = INITIAL_JIFFIES;
+
+EXPORT_SYMBOL(jiffies_64);
+
+extern unsigned long wall_jiffies;
+#define TICK_SIZE       (tick_nsec / 1000)
+
+/*
+ * Change this if you have some constant time drift
+ */
+
+/* This is for machines which generate the exact clock. */
+#define USECS_PER_JIFFY (1000000/HZ)
+
+static unsigned long latch;
+
+static unsigned long do_gettimeoffset(void)
+{
+        unsigned long  elapsed_time = 0;  /* [us] */
+
+#if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \
+        || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \
+        || defined(CONFIG_CHIP_OPSP)
+#ifndef CONFIG_SMP
+
+        unsigned long count;
+
+        /* timer count may underflow right here */
+        count = inl(M32R_MFT2CUT_PORTL);
+
+        if (inl(M32R_ICU_CR18_PORTL) & 0x00000100)      /* underflow check */
+                count = 0;
+
+        count = (latch - count) * TICK_SIZE;
+        elapsed_time = (count + latch / 2) / latch;
+        /* NOTE: LATCH is equal to the "interval" value (= reload count). */
+
+#else /* CONFIG_SMP */
+        unsigned long count;
+        static unsigned long p_jiffies = -1;
+        static unsigned long p_count = 0;
+
+        /* timer count may underflow right here */
+        count = inl(M32R_MFT2CUT_PORTL);
+
+        if (jiffies == p_jiffies && count > p_count)
+                count = 0;
+
+        p_jiffies = jiffies;
+        p_count = count;
+
+        count = (latch - count) * TICK_SIZE;
+        elapsed_time = (count + latch / 2) / latch;
+        /* NOTE: LATCH is equal to the "interval" value (= reload count). */
+#endif /* CONFIG_SMP */
+#elif defined(CONFIG_CHIP_M32310)
+#warning do_gettimeoffse not implemented
+#else
+#error no chip configuration
+#endif
+
+        return elapsed_time;
+}
+
+/*
+ * This version of gettimeofday has near microsecond resolution.
+ */
+void do_gettimeofday(struct timeval *tv)
+{
+        unsigned long seq;
+        unsigned long usec, sec;
+        unsigned long max_ntp_tick = tick_usec - tickadj;
+
+        do {
+                unsigned long lost;
+
+                seq = read_seqbegin(&xtime_lock);
+
+                usec = do_gettimeoffset();
+                lost = jiffies - wall_jiffies;
+
+                /*
+                 * If time_adjust is negative then NTP is slowing the clock
+                 * so make sure not to go into next possible interval.
+                 * Better to lose some accuracy than have time go backwards..
+                 */
+                if (unlikely(time_adjust < 0)) {
+                        usec = min(usec, max_ntp_tick);
+                        if (lost)
+                                usec += lost * max_ntp_tick;
+                } else if (unlikely(lost))
+                        usec += lost * tick_usec;
+
+                sec = xtime.tv_sec;
+                usec += (xtime.tv_nsec / 1000);
+        } while (read_seqretry(&xtime_lock, seq));
+
+        while (usec >= 1000000) {
+                usec -= 1000000;
+                sec++;
+        }
+
+        tv->tv_sec = sec;
+        tv->tv_usec = usec;
+}
+
+EXPORT_SYMBOL(do_gettimeofday);
+
+int do_settimeofday(struct timespec *tv)
+{
+        time_t wtm_sec, sec = tv->tv_sec;
+        long wtm_nsec, nsec = tv->tv_nsec;
+
+        if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
+                return -EINVAL;
+
+        write_seqlock_irq(&xtime_lock);
+        /*
+         * This is revolting. We need to set "xtime" correctly. However, the
+         * value in this location is the value at the most recent update of
+         * wall time.  Discover what correction gettimeofday() would have
+         * made, and then undo it!
+         */
+        nsec -= do_gettimeoffset() * NSEC_PER_USEC;
+        nsec -= (jiffies - wall_jiffies) * TICK_NSEC;
+
+        wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
+        wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
+
+        set_normalized_timespec(&xtime, sec, nsec);
+        set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
+
+        time_adjust = 0;                /* stop active adjtime() */
+        time_status |= STA_UNSYNC;
+        time_maxerror = NTP_PHASE_LIMIT;
+        time_esterror = NTP_PHASE_LIMIT;
+        write_sequnlock_irq(&xtime_lock);
+        clock_was_set();
+
+        return 0;
+}
+
+EXPORT_SYMBOL(do_settimeofday);
+
+/*
+ * In order to set the CMOS clock precisely, set_rtc_mmss has to be
+ * called 500 ms after the second nowtime has started, because when
+ * nowtime is written into the registers of the CMOS clock, it will
+ * jump to the next second precisely 500 ms later. Check the Motorola
+ * MC146818A or Dallas DS12887 data sheet for details.
+ *
+ * BUG: This routine does not handle hour overflow properly; it just
+ *      sets the minutes. Usually you won't notice until after reboot!
+ */
+static inline int set_rtc_mmss(unsigned long nowtime)
+{
+        return 0;
+}
+
+/* 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
+ */
+static inline void
+do_timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+#ifndef CONFIG_SMP
+        profile_tick(CPU_PROFILING, regs);
+#endif
+        do_timer(regs);
+
+#ifndef CONFIG_SMP
+        update_process_times(user_mode(regs));
+#endif
+        /*
+         * If we have an externally synchronized 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_status & STA_UNSYNC) == 0
+                && xtime.tv_sec > last_rtc_update + 660
+                && (xtime.tv_nsec / 1000) >= 500000 - ((unsigned)TICK_SIZE) / 2
+                && (xtime.tv_nsec / 1000) <= 500000 + ((unsigned)TICK_SIZE) / 2)
+        {
+                if (set_rtc_mmss(xtime.tv_sec) == 0)
+                        last_rtc_update = xtime.tv_sec;
+                else    /* do it again in 60 s */
+                        last_rtc_update = xtime.tv_sec - 600;
+        }
+        /* As we return to user mode fire off the other CPU schedulers..
+           this is basically because we don't yet share IRQ's around.
+           This message is rigged to be safe on the 386 - basically it's
+           a hack, so don't look closely for now.. */
+
+#ifdef CONFIG_SMP
+        smp_local_timer_interrupt(regs);
+#endif
+}
+
+irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        write_seqlock(&xtime_lock);
+        do_timer_interrupt(irq, NULL, regs);
+        write_sequnlock(&xtime_lock);
+
+        return IRQ_HANDLED;
+}
+
+struct irqaction irq0 = { timer_interrupt, SA_INTERRUPT, CPU_MASK_NONE,
+                          "MFT2", NULL, NULL };
+
+void __init time_init(void)
+{
+        unsigned int epoch, year, mon, day, hour, min, sec;
+
+        sec = min = hour = day = mon = year = 0;
+        epoch = 0;
+
+        year = 23;
+        mon = 4;
+        day = 17;
+
+        /* Attempt to guess the epoch.  This is the same heuristic as in rtc.c
+           so no stupid things will happen to timekeeping.  Who knows, maybe
+           Ultrix also uses 1952 as epoch ...  */
+        if (year > 10 && year < 44)
+                epoch = 1980;
+        else if (year < 96)
+                epoch = 1952;
+        year += epoch;
+
+        xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
+        xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
+        set_normalized_timespec(&wall_to_monotonic,
+                -xtime.tv_sec, -xtime.tv_nsec);
+
+#if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \
+        || defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \
+        || defined(CONFIG_CHIP_OPSP)
+
+        /* M32102 MFT setup */
+        setup_irq(M32R_IRQ_MFT2, &irq0);
+        {
+                unsigned long bus_clock;
+                unsigned short divide;
+
+                bus_clock = boot_cpu_data.bus_clock;
+                divide = boot_cpu_data.timer_divide;
+                latch = (bus_clock/divide + HZ / 2) / HZ;
+
+                printk("Timer start : latch = %ld\n", latch);
+
+                outl((M32R_MFTMOD_CC_MASK | M32R_MFTMOD_TCCR \
+                        |M32R_MFTMOD_CSSEL011), M32R_MFT2MOD_PORTL);
+                outl(latch, M32R_MFT2RLD_PORTL);
+                outl(latch, M32R_MFT2CUT_PORTL);
+                outl(0, M32R_MFT2CMPRLD_PORTL);
+                outl((M32R_MFTCR_MFT2MSK|M32R_MFTCR_MFT2EN), M32R_MFTCR_PORTL);
+        }
+
+#elif defined(CONFIG_CHIP_M32310)
+#warning time_init not implemented
+#else
+#error no chip configuration
+#endif
+}
+
+/*
+ *  Scheduler clock - returns current time in nanosec units.
+ */
+unsigned long long sched_clock(void)
+{
+        return (unsigned long long)jiffies * (1000000000 / HZ);
+}