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>
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@ -13,7 +13,6 @@
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#include <asm/delay.h>
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#include <asm/i8253.h>
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#include <asm/io.h>
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#include <asm/timer.h>
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DEFINE_SPINLOCK(i8253_lock);
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EXPORT_SYMBOL(i8253_lock);
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@ -120,6 +119,7 @@ void __init setup_pit_timer(void)
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global_clock_event = &pit_clockevent;
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}
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#ifndef CONFIG_X86_64
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/*
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* Since the PIT overflows every tick, its not very useful
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* to just read by itself. So use jiffies to emulate a free
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@ -204,3 +204,5 @@ static int __init init_pit_clocksource(void)
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return clocksource_register(&clocksource_pit);
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}
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arch_initcall(init_pit_clocksource);
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#endif
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@ -1,8 +1,6 @@
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#ifndef __ASM_I8253_H__
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#define __ASM_I8253_H__
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#include <linux/clockchips.h>
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/* i8253A PIT registers */
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#define PIT_MODE 0x43
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#define PIT_CH0 0x40
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@ -10,8 +8,12 @@
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extern spinlock_t i8253_lock;
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#ifdef CONFIG_GENERIC_CLOCKEVENTS
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extern struct clock_event_device *global_clock_event;
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extern void setup_pit_timer(void);
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#endif
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#endif /* __ASM_I8253_H__ */
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