[PARISC] Add new function to start local Interval Timer, start_cpu_itimer()

I couldn't find where the itimer was getting started for slave CPUs.
CPU 0 (master) itimer was started in time_init() (arch/parisc/kernel/time.c).
start_cpu_itimer() code was striped from time_init().
Slaves now start their itimer in smp_cpu_init().

This is a first step towards making gettimeoffset() work for SMP.
Next step will be to determine the CR16 (cycle counter)
offsets for each CPU relative to the master (CPU 0).

Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

2 files changed, 14 insertions, 10 deletions

diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 98e40959a564..f33e8de438dc 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -430,8 +430,9 @@ smp_do_timer(struct pt_regs *regs)
 static void __init
 smp_cpu_init(int cpunum)
 {
-        extern int init_per_cpu(int);  /* arch/parisc/kernel/setup.c */
+        extern int init_per_cpu(int);  /* arch/parisc/kernel/processor.c */
         extern void init_IRQ(void);    /* arch/parisc/kernel/irq.c */
+        extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */
 
         /* Set modes and Enable floating point coprocessor */
         (void) init_per_cpu(cpunum);
@@ -457,6 +458,7 @@ smp_cpu_init(int cpunum)
         enter_lazy_tlb(&init_mm, current);
 
         init_IRQ();   /* make sure no IRQ's are enabled or pending */
+        start_cpu_itimer();
 }
 
 
diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c
index ab641d67f551..47831c2cd093 100644
--- a/arch/parisc/kernel/time.c
+++ b/arch/parisc/kernel/time.c
@@ -223,22 +223,24 @@ unsigned long long sched_clock(void)
 }
 
 
+void __init start_cpu_itimer(void)
+{
+        unsigned int cpu = smp_processor_id();
+        unsigned long next_tick = mfctl(16) + clocktick;
+
+        mtctl(next_tick, 16);           /* kick off Interval Timer (CR16) */
+
+        cpu_data[cpu].it_value = next_tick;
+}
+
 void __init time_init(void)
 {
-        unsigned long next_tick;
         static struct pdc_tod tod_data;
 
         clocktick = (100 * PAGE0->mem_10msec) / HZ;
         halftick = clocktick / 2;
 
-        /* Setup clock interrupt timing */
-
-        next_tick = mfctl(16);
-        next_tick += clocktick;
-        cpu_data[smp_processor_id()].it_value = next_tick;
-
-        /* kick off Itimer (CR16) */
-        mtctl(next_tick, 16);
+        start_cpu_itimer();     /* get CPU 0 started */
 
         if(pdc_tod_read(&tod_data) == 0) {
                 write_seqlock_irq(&xtime_lock);