i386: prepare sharing the PIT code

PIT clock events work already and the PIT handling is the same for
i386 and x86_64. x86_64 does not support PIT as a clock source, so
disable the PIT clocksource for x86_64.

Prepare i8253.h to be shared with x8664

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/asm-x86/i8253_32.h b/include/asm-x86/i8253_32.h
index 7577d058d86e..28cf67da59a3 100644
--- a/include/asm-x86/i8253_32.h
+++ b/include/asm-x86/i8253_32.h
@@ -1,8 +1,6 @@
 #ifndef __ASM_I8253_H__
 #define __ASM_I8253_H__
 
-#include <linux/clockchips.h>
-
 /* i8253A PIT registers */
 #define PIT_MODE                0x43
 #define PIT_CH0                 0x40
@@ -10,8 +8,12 @@
 
 extern spinlock_t i8253_lock;
 
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+
 extern struct clock_event_device *global_clock_event;
 
 extern void setup_pit_timer(void);
 
+#endif
+
 #endif  /* __ASM_I8253_H__ */