x86: apic - unify __setup_APIC_LVTT

To be able to unify this function we RE-introduce
APIC_DIVISOR for 64bit mode. This snipped was eliminated
in some time ago in a sake of clenup but now we need it
again since it allow up to get rid of #ifdef(s).

And lapic_is_integrated call is added in apic_64.c but
since we always have APIC integrated on 64bit cpu compiler
will ignore this call.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 8 insertions, 2 deletions

diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 1e925be861e4..ac399d0f65c0 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -244,6 +244,9 @@ int lapic_get_maxlvt(void)
         return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2;
 }
 
+/* Clock divisor is set to 1 */
+#define APIC_DIVISOR 1
+
 /*
  * This function sets up the local APIC timer, with a timeout of
  * 'clocks' APIC bus clock. During calibration we actually call
@@ -262,6 +265,9 @@ static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
         lvtt_value = LOCAL_TIMER_VECTOR;
         if (!oneshot)
                 lvtt_value |= APIC_LVT_TIMER_PERIODIC;
+        if (!lapic_is_integrated())
+                lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV);
+
         if (!irqen)
                 lvtt_value |= APIC_LVT_MASKED;
 
@@ -276,7 +282,7 @@ static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
                                 | APIC_TDR_DIV_16);
 
         if (!oneshot)
-                apic_write(APIC_TMICT, clocks);
+                apic_write(APIC_TMICT, clocks / APIC_DIVISOR);
 }
 
 /*
@@ -446,7 +452,7 @@ static int __init calibrate_APIC_clock(void)
         lapic_clockevent.min_delta_ns =
                 clockevent_delta2ns(0xF, &lapic_clockevent);
 
-        calibration_result = result / HZ;
+        calibration_result = (result * APIC_DIVISOR) / HZ;
 
         /*
          * Do a sanity check on the APIC calibration result