1 files changed, 222 insertions, 194 deletions

diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index 9a5596bf8571..5892491b40eb 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -11,6 +11,7 @@
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  */
+#include <linux/clockchips.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
@@ -24,6 +25,7 @@
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/kallsyms.h>
 
 #include <asm/bootinfo.h>
 #include <asm/cache.h>
@@ -32,8 +34,11 @@
 #include <asm/cpu-features.h>
 #include <asm/div64.h>
 #include <asm/sections.h>
+#include <asm/smtc_ipi.h>
 #include <asm/time.h>
 
+#include <irq.h>
+
 /*
  * The integer part of the number of usecs per jiffy is taken from tick,
  * but the fractional part is not recorded, so we calculate it using the
@@ -49,32 +54,27 @@
  * forward reference
  */
 DEFINE_SPINLOCK(rtc_lock);
+EXPORT_SYMBOL(rtc_lock);
 
-/*
- * By default we provide the null RTC ops
- */
-static unsigned long null_rtc_get_time(void)
+int __weak rtc_mips_set_time(unsigned long sec)
 {
-        return mktime(2000, 1, 1, 0, 0, 0);
+        return 0;
 }
+EXPORT_SYMBOL(rtc_mips_set_time);
 
-static int null_rtc_set_time(unsigned long sec)
+int __weak rtc_mips_set_mmss(unsigned long nowtime)
 {
-        return 0;
+        return rtc_mips_set_time(nowtime);
 }
 
-unsigned long (*rtc_mips_get_time)(void) = null_rtc_get_time;
-int (*rtc_mips_set_time)(unsigned long) = null_rtc_set_time;
-int (*rtc_mips_set_mmss)(unsigned long);
-
+int update_persistent_clock(struct timespec now)
+{
+        return rtc_mips_set_mmss(now.tv_sec);
+}
 
 /* how many counter cycles in a jiffy */
 static unsigned long cycles_per_jiffy __read_mostly;
 
-/* expirelo is the count value for next CPU timer interrupt */
-static unsigned int expirelo;
-
-
 /*
  * Null timer ack for systems not needing one (e.g. i8254).
  */
@@ -93,18 +93,7 @@ static cycle_t null_hpt_read(void)
  */
 static void c0_timer_ack(void)
 {
-        unsigned int count;
-
-        /* Ack this timer interrupt and set the next one.  */
-        expirelo += cycles_per_jiffy;
-        write_c0_compare(expirelo);
-
-        /* Check to see if we have missed any timer interrupts.  */
-        while (((count = read_c0_count()) - expirelo) < 0x7fffffff) {
-                /* missed_timer_count++; */
-                expirelo = count + cycles_per_jiffy;
-                write_c0_compare(expirelo);
-        }
+        write_c0_compare(read_c0_compare());
 }
 
 /*
@@ -115,19 +104,9 @@ static cycle_t c0_hpt_read(void)
         return read_c0_count();
 }
 
-/* For use both as a high precision timer and an interrupt source.  */
-static void __init c0_hpt_timer_init(void)
-{
-        expirelo = read_c0_count() + cycles_per_jiffy;
-        write_c0_compare(expirelo);
-}
-
 int (*mips_timer_state)(void);
 void (*mips_timer_ack)(void);
 
-/* last time when xtime and rtc are sync'ed up */
-static long last_rtc_update;
-
 /*
  * local_timer_interrupt() does profiling and process accounting
  * on a per-CPU basis.
@@ -144,60 +123,15 @@ void local_timer_interrupt(int irq, void *dev_id)
         update_process_times(user_mode(get_irq_regs()));
 }
 
-/*
- * High-level timer interrupt service routines.  This function
- * is set as irqaction->handler and is invoked through do_IRQ.
- */
-irqreturn_t timer_interrupt(int irq, void *dev_id)
-{
-        write_seqlock(&xtime_lock);
-
-        mips_timer_ack();
-
-        /*
-         * call the generic timer interrupt handling
-         */
-        do_timer(1);
-
-        /*
-         * If we have an externally synchronized Linux clock, then update
-         * CMOS clock accordingly every ~11 minutes. rtc_mips_set_time() has to be
-         * called as close as possible to 500 ms before the new second starts.
-         */
-        if (ntp_synced() &&
-            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 (rtc_mips_set_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;
-                }
-        }
-
-        write_sequnlock(&xtime_lock);
-
-        /*
-         * In UP mode, we call local_timer_interrupt() to do profiling
-         * and process accouting.
-         *
-         * In SMP mode, local_timer_interrupt() is invoked by appropriate
-         * low-level local timer interrupt handler.
-         */
-        local_timer_interrupt(irq, dev_id);
-
-        return IRQ_HANDLED;
-}
-
 int null_perf_irq(void)
 {
         return 0;
 }
 
+EXPORT_SYMBOL(null_perf_irq);
+
 int (*perf_irq)(void) = null_perf_irq;
 
-EXPORT_SYMBOL(null_perf_irq);
 EXPORT_SYMBOL(perf_irq);
 
 /*
@@ -215,7 +149,7 @@ EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
  * Possibly handle a performance counter interrupt.
  * Return true if the timer interrupt should not be checked
  */
-static inline int handle_perf_irq (int r2)
+static inline int handle_perf_irq(int r2)
 {
         /*
          * The performance counter overflow interrupt may be shared with the
@@ -229,63 +163,23 @@ static inline int handle_perf_irq (int r2)
                 !r2;
 }
 
-asmlinkage void ll_timer_interrupt(int irq)
-{
-        int r2 = cpu_has_mips_r2;
-
-        irq_enter();
-        kstat_this_cpu.irqs[irq]++;
-
-        if (handle_perf_irq(r2))
-                goto out;
-
-        if (r2 && ((read_c0_cause() & (1 << 30)) == 0))
-                goto out;
-
-        timer_interrupt(irq, NULL);
-
-out:
-        irq_exit();
-}
-
-asmlinkage void ll_local_timer_interrupt(int irq)
-{
-        irq_enter();
-        if (smp_processor_id() != 0)
-                kstat_this_cpu.irqs[irq]++;
-
-        /* we keep interrupt disabled all the time */
-        local_timer_interrupt(irq, NULL);
-
-        irq_exit();
-}
-
 /*
  * time_init() - it does the following things.
  *
- * 1) board_time_init() -
+ * 1) plat_time_init() -
  *      a) (optional) set up RTC routines,
  *      b) (optional) calibrate and set the mips_hpt_frequency
  *          (only needed if you intended to use cpu counter as timer interrupt
  *           source)
- * 2) setup xtime based on rtc_mips_get_time().
- * 3) calculate a couple of cached variables for later usage
- * 4) plat_timer_setup() -
+ * 2) calculate a couple of cached variables for later usage
+ * 3) plat_timer_setup() -
  *      a) (optional) over-write any choices made above by time_init().
  *      b) machine specific code should setup the timer irqaction.
  *      c) enable the timer interrupt
  */
 
-void (*board_time_init)(void);
-
 unsigned int mips_hpt_frequency;
 
-static struct irqaction timer_irqaction = {
-        .handler = timer_interrupt,
-        .flags = IRQF_DISABLED | IRQF_PERCPU,
-        .name = "timer",
-};
-
 static unsigned int __init calibrate_hpt(void)
 {
         cycle_t frequency, hpt_start, hpt_end, hpt_count, hz;
@@ -334,6 +228,84 @@ struct clocksource clocksource_mips = {
         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
+static int mips_next_event(unsigned long delta,
+                           struct clock_event_device *evt)
+{
+        unsigned int cnt;
+        int res;
+
+#ifdef CONFIG_MIPS_MT_SMTC
+        {
+        unsigned long flags, vpflags;
+        local_irq_save(flags);
+        vpflags = dvpe();
+#endif
+        cnt = read_c0_count();
+        cnt += delta;
+        write_c0_compare(cnt);
+        res = ((long)(read_c0_count() - cnt ) > 0) ? -ETIME : 0;
+#ifdef CONFIG_MIPS_MT_SMTC
+        evpe(vpflags);
+        local_irq_restore(flags);
+        }
+#endif
+        return res;
+}
+
+static void mips_set_mode(enum clock_event_mode mode,
+                          struct clock_event_device *evt)
+{
+        /* Nothing to do ...  */
+}
+
+static DEFINE_PER_CPU(struct clock_event_device, mips_clockevent_device);
+static int cp0_timer_irq_installed;
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id)
+{
+        const int r2 = cpu_has_mips_r2;
+        struct clock_event_device *cd;
+        int cpu = smp_processor_id();
+
+        /*
+         * Suckage alert:
+         * Before R2 of the architecture there was no way to see if a
+         * performance counter interrupt was pending, so we have to run
+         * the performance counter interrupt handler anyway.
+         */
+        if (handle_perf_irq(r2))
+                goto out;
+
+        /*
+         * The same applies to performance counter interrupts.  But with the
+         * above we now know that the reason we got here must be a timer
+         * interrupt.  Being the paranoiacs we are we check anyway.
+         */
+        if (!r2 || (read_c0_cause() & (1 << 30))) {
+                c0_timer_ack();
+#ifdef CONFIG_MIPS_MT_SMTC
+                if (cpu_data[cpu].vpe_id)
+                        goto out;
+                cpu = 0;
+#endif
+                cd = &per_cpu(mips_clockevent_device, cpu);
+                cd->event_handler(cd);
+        }
+
+out:
+        return IRQ_HANDLED;
+}
+
+static struct irqaction timer_irqaction = {
+        .handler = timer_interrupt,
+#ifdef CONFIG_MIPS_MT_SMTC
+        .flags = IRQF_DISABLED,
+#else
+        .flags = IRQF_DISABLED | IRQF_PERCPU,
+#endif
+        .name = "timer",
+};
+
 static void __init init_mips_clocksource(void)
 {
         u64 temp;
@@ -357,19 +329,127 @@ static void __init init_mips_clocksource(void)
         clocksource_register(&clocksource_mips);
 }
 
-void __init time_init(void)
+void __init __weak plat_time_init(void)
+{
+}
+
+void __init __weak plat_timer_setup(struct irqaction *irq)
+{
+}
+
+#ifdef CONFIG_MIPS_MT_SMTC
+DEFINE_PER_CPU(struct clock_event_device, smtc_dummy_clockevent_device);
+
+static void smtc_set_mode(enum clock_event_mode mode,
+                          struct clock_event_device *evt)
+{
+}
+
+int dummycnt[NR_CPUS];
+
+static void mips_broadcast(cpumask_t mask)
+{
+        unsigned int cpu;
+
+        for_each_cpu_mask(cpu, mask)
+                smtc_send_ipi(cpu, SMTC_CLOCK_TICK, 0);
+}
+
+static void setup_smtc_dummy_clockevent_device(void)
+{
+        //uint64_t mips_freq = mips_hpt_^frequency;
+        unsigned int cpu = smp_processor_id();
+        struct clock_event_device *cd;
+
+        cd = &per_cpu(smtc_dummy_clockevent_device, cpu);
+
+        cd->name                = "SMTC";
+        cd->features            = CLOCK_EVT_FEAT_DUMMY;
+
+        /* Calculate the min / max delta */
+        cd->mult        = 0; //div_sc((unsigned long) mips_freq, NSEC_PER_SEC, 32);
+        cd->shift               = 0; //32;
+        cd->max_delta_ns        = 0; //clockevent_delta2ns(0x7fffffff, cd);
+        cd->min_delta_ns        = 0; //clockevent_delta2ns(0x30, cd);
+
+        cd->rating              = 200;
+        cd->irq                 = 17; //-1;
+//      if (cpu)
+//              cd->cpumask     = CPU_MASK_ALL; // cpumask_of_cpu(cpu);
+//      else
+                cd->cpumask     = cpumask_of_cpu(cpu);
+
+        cd->set_mode            = smtc_set_mode;
+
+        cd->broadcast           = mips_broadcast;
+
+        clockevents_register_device(cd);
+}
+#endif
+
+static void mips_event_handler(struct clock_event_device *dev)
 {
-        if (board_time_init)
-                board_time_init();
+}
 
-        if (!rtc_mips_set_mmss)
-                rtc_mips_set_mmss = rtc_mips_set_time;
+void __cpuinit mips_clockevent_init(void)
+{
+        uint64_t mips_freq = mips_hpt_frequency;
+        unsigned int cpu = smp_processor_id();
+        struct clock_event_device *cd;
+        unsigned int irq = MIPS_CPU_IRQ_BASE + 7;
 
-        xtime.tv_sec = rtc_mips_get_time();
-        xtime.tv_nsec = 0;
+        if (!cpu_has_counter)
+                return;
 
-        set_normalized_timespec(&wall_to_monotonic,
-                                -xtime.tv_sec, -xtime.tv_nsec);
+#ifdef CONFIG_MIPS_MT_SMTC
+        setup_smtc_dummy_clockevent_device();
+
+        /*
+         * On SMTC we only register VPE0's compare interrupt as clockevent
+         * device.
+         */
+        if (cpu)
+                return;
+#endif
+
+        cd = &per_cpu(mips_clockevent_device, cpu);
+
+        cd->name                = "MIPS";
+        cd->features            = CLOCK_EVT_FEAT_ONESHOT;
+
+        /* Calculate the min / max delta */
+        cd->mult        = div_sc((unsigned long) mips_freq, NSEC_PER_SEC, 32);
+        cd->shift               = 32;
+        cd->max_delta_ns        = clockevent_delta2ns(0x7fffffff, cd);
+        cd->min_delta_ns        = clockevent_delta2ns(0x30, cd);
+
+        cd->rating              = 300;
+        cd->irq                 = irq;
+#ifdef CONFIG_MIPS_MT_SMTC
+        cd->cpumask             = CPU_MASK_ALL;
+#else
+        cd->cpumask             = cpumask_of_cpu(cpu);
+#endif
+        cd->set_next_event      = mips_next_event;
+        cd->set_mode            = mips_set_mode;
+        cd->event_handler       = mips_event_handler;
+
+        clockevents_register_device(cd);
+
+        if (!cp0_timer_irq_installed) {
+#ifdef CONFIG_MIPS_MT_SMTC
+#define CPUCTR_IMASKBIT (0x100 << cp0_compare_irq)
+                setup_irq_smtc(irq, &timer_irqaction, CPUCTR_IMASKBIT);
+#else
+                setup_irq(irq, &timer_irqaction);
+#endif /* CONFIG_MIPS_MT_SMTC */
+                cp0_timer_irq_installed = 1;
+        }
+}
+
+void __init time_init(void)
+{
+        plat_time_init();
 
         /* Choose appropriate high precision timer routines.  */
         if (!cpu_has_counter && !clocksource_mips.read)
@@ -392,11 +472,6 @@ void __init time_init(void)
                                 /* Calculate cache parameters.  */
                                 cycles_per_jiffy =
                                         (mips_hpt_frequency + HZ / 2) / HZ;
-                                /*
-                                 * This sets up the high precision
-                                 * timer for the first interrupt.
-                                 */
-                                c0_hpt_timer_init();
                         }
                 }
                 if (!mips_hpt_frequency)
@@ -406,6 +481,10 @@ void __init time_init(void)
                 printk("Using %u.%03u MHz high precision timer.\n",
                        ((mips_hpt_frequency + 500) / 1000) / 1000,
                        ((mips_hpt_frequency + 500) / 1000) % 1000);
+
+#ifdef CONFIG_IRQ_CPU
+                setup_irq(MIPS_CPU_IRQ_BASE + 7, &timer_irqaction);
+#endif
         }
 
         if (!mips_timer_ack)
@@ -426,56 +505,5 @@ void __init time_init(void)
         plat_timer_setup(&timer_irqaction);
 
         init_mips_clocksource();
+        mips_clockevent_init();
 }
-
-#define FEBRUARY                2
-#define STARTOFTIME             1970
-#define SECDAY                  86400L
-#define SECYR                   (SECDAY * 365)
-#define leapyear(y)             ((!((y) % 4) && ((y) % 100)) || !((y) % 400))
-#define days_in_year(y)         (leapyear(y) ? 366 : 365)
-#define days_in_month(m)        (month_days[(m) - 1])
-
-static int month_days[12] = {
-        31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-};
-
-void to_tm(unsigned long tim, struct rtc_time *tm)
-{
-        long hms, day, gday;
-        int i;
-
-        gday = day = tim / SECDAY;
-        hms = tim % SECDAY;
-
-        /* Hours, minutes, seconds are easy */
-        tm->tm_hour = hms / 3600;
-        tm->tm_min = (hms % 3600) / 60;
-        tm->tm_sec = (hms % 3600) % 60;
-
-        /* Number of years in days */
-        for (i = STARTOFTIME; day >= days_in_year(i); i++)
-                day -= days_in_year(i);
-        tm->tm_year = i;
-
-        /* Number of months in days left */
-        if (leapyear(tm->tm_year))
-                days_in_month(FEBRUARY) = 29;
-        for (i = 1; day >= days_in_month(i); i++)
-                day -= days_in_month(i);
-        days_in_month(FEBRUARY) = 28;
-        tm->tm_mon = i - 1;             /* tm_mon starts from 0 to 11 */
-
-        /* Days are what is left over (+1) from all that. */
-        tm->tm_mday = day + 1;
-
-        /*
-         * Determine the day of week
-         */
-        tm->tm_wday = (gday + 4) % 7;   /* 1970/1/1 was Thursday */
-}
-
-EXPORT_SYMBOL(rtc_lock);
-EXPORT_SYMBOL(to_tm);
-EXPORT_SYMBOL(rtc_mips_set_time);
-EXPORT_SYMBOL(rtc_mips_get_time);