1 files changed, 234 insertions, 0 deletions

diff --git a/arch/frv/kernel/time.c b/arch/frv/kernel/time.c
new file mode 100644
index 000000000000..075db6644694
--- /dev/null
+++ b/arch/frv/kernel/time.c
@@ -0,0 +1,234 @@
+/* time.c: FRV arch-specific time handling
+ *
+ * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * - Derived from arch/m68k/kernel/time.c
+ *
+ * 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/config.h> /* CONFIG_HEARTBEAT */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/profile.h>
+#include <linux/irq.h>
+#include <linux/mm.h>
+
+#include <asm/io.h>
+#include <asm/timer-regs.h>
+#include <asm/mb-regs.h>
+#include <asm/mb86943a.h>
+#include <asm/irq-routing.h>
+
+#include <linux/timex.h>
+
+#define TICK_SIZE (tick_nsec / 1000)
+
+extern unsigned long wall_jiffies;
+
+u64 jiffies_64 = INITIAL_JIFFIES;
+EXPORT_SYMBOL(jiffies_64);
+
+unsigned long __nongprelbss __clkin_clock_speed_HZ;
+unsigned long __nongprelbss __ext_bus_clock_speed_HZ;
+unsigned long __nongprelbss __res_bus_clock_speed_HZ;
+unsigned long __nongprelbss __sdram_clock_speed_HZ;
+unsigned long __nongprelbss __core_bus_clock_speed_HZ;
+unsigned long __nongprelbss __core_clock_speed_HZ;
+unsigned long __nongprelbss __dsu_clock_speed_HZ;
+unsigned long __nongprelbss __serial_clock_speed_HZ;
+unsigned long __delay_loops_MHz;
+
+static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs *regs);
+
+static struct irqaction timer_irq  = {
+        timer_interrupt, SA_INTERRUPT, CPU_MASK_NONE, "timer", NULL, NULL
+};
+
+static inline int set_rtc_mmss(unsigned long nowtime)
+{
+        return -1;
+}
+
+/*
+ * timer_interrupt() needs to keep up the real-time clock,
+ * as well as call the "do_timer()" routine every clocktick
+ */
+static irqreturn_t timer_interrupt(int irq, void *dummy, struct pt_regs * regs)
+{
+        /* last time the cmos clock got updated */
+        static long last_rtc_update = 0;
+
+        /*
+         * Here we are in the timer irq handler. We just have irqs locally
+         * disabled but we don't know if the timer_bh is running on the other
+         * CPU. We need to avoid to SMP race with it. NOTE: we don' t need
+         * the irq version of write_lock because as just said we have irq
+         * locally disabled. -arca
+         */
+        write_seqlock(&xtime_lock);
+
+        do_timer(regs);
+        update_process_times(user_mode(regs));
+        profile_tick(CPU_PROFILING, regs);
+
+        /*
+         * 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
+                        last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
+        }
+
+#ifdef CONFIG_HEARTBEAT
+        static unsigned short n;
+        n++;
+        __set_LEDS(n);
+#endif /* CONFIG_HEARTBEAT */
+
+        write_sequnlock(&xtime_lock);
+        return IRQ_HANDLED;
+}
+
+void time_divisor_init(void)
+{
+        unsigned short base, pre, prediv;
+
+        /* set the scheduling timer going */
+        pre = 1;
+        prediv = 4;
+        base = __res_bus_clock_speed_HZ / pre / HZ / (1 << prediv);
+
+        __set_TPRV(pre);
+        __set_TxCKSL_DATA(0, prediv);
+        __set_TCTR(TCTR_SC_CTR0 | TCTR_RL_RW_LH8 | TCTR_MODE_2);
+        __set_TCSR_DATA(0, base & 0xff);
+        __set_TCSR_DATA(0, base >> 8);
+}
+
+void time_init(void)
+{
+        unsigned int year, mon, day, hour, min, sec;
+
+        extern void arch_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec);
+
+        /* FIX by dqg : Set to zero for platforms that don't have tod */
+        /* without this time is undefined and can overflow time_t, causing  */
+        /* very stange errors */
+        year = 1980;
+        mon = day = 1;
+        hour = min = sec = 0;
+        arch_gettod (&year, &mon, &day, &hour, &min, &sec);
+
+        if ((year += 1900) < 1970)
+                year += 100;
+        xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
+        xtime.tv_nsec = 0;
+
+        /* install scheduling interrupt handler */
+        setup_irq(IRQ_CPU_TIMER0, &timer_irq);
+
+        time_divisor_init();
+}
+
+/*
+ * 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;
+
+        do {
+                unsigned long lost;
+
+                seq = read_seqbegin(&xtime_lock);
+
+                usec = 0;
+                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)) {
+                        max_ntp_tick = (USEC_PER_SEC / HZ) - tickadj;
+                        usec = min(usec, max_ntp_tick);
+
+                        if (lost)
+                                usec += lost * max_ntp_tick;
+                }
+                else if (unlikely(lost))
+                        usec += lost * (USEC_PER_SEC / HZ);
+
+                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;
+}
+
+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 -= 0 * 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;
+}
+
+/*
+ * Scheduler clock - returns current time in nanosec units.
+ */
+unsigned long long sched_clock(void)
+{
+        return jiffies_64 * (1000000000 / HZ);
+}