45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
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* timer.h: Definitions for the timer chips on the Sparc.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#ifndef _SPARC_TIMER_H
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#define _SPARC_TIMER_H
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#include <linux/clocksource.h>
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#include <linux/irqreturn.h>
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#include <asm-generic/percpu.h>
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#include <asm/cpu_type.h> /* For SUN4M_NCPUS */
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#define SBUS_CLOCK_RATE 2000000 /* 2MHz */
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#define TIMER_VALUE_SHIFT 9
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#define TIMER_VALUE_MASK 0x3fffff
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#define TIMER_LIMIT_BIT (1 << 31) /* Bit 31 in Counter-Timer register */
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/* The counter timer register has the value offset by 9 bits.
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* From sun4m manual:
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* When a counter reaches the value in the corresponding limit register,
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* the Limit bit is set and the counter is set to 500 nS (i.e. 0x00000200).
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*
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* To compensate for this add one to the value.
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*/
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static inline unsigned int timer_value(unsigned int value)
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{
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return (value + 1) << TIMER_VALUE_SHIFT;
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}
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extern __volatile__ unsigned int *master_l10_counter;
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extern irqreturn_t notrace timer_interrupt(int dummy, void *dev_id);
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#ifdef CONFIG_SMP
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DECLARE_PER_CPU(struct clock_event_device, sparc32_clockevent);
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extern void register_percpu_ce(int cpu);
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#endif
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#endif /* !(_SPARC_TIMER_H) */
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