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/* SPDX-License-Identifier: GPL-2.0 */
/*
* timer.h: Definitions for the timer chips on the Sparc.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef _SPARC_TIMER_H
#define _SPARC_TIMER_H
#include <linux/clocksource.h>
#include <linux/irqreturn.h>
#include <asm-generic/percpu.h>
#include <asm/cpu_type.h> /* For SUN4M_NCPUS */
#define SBUS_CLOCK_RATE 2000000 /* 2MHz */
#define TIMER_VALUE_SHIFT 9
#define TIMER_VALUE_MASK 0x3fffff
#define TIMER_LIMIT_BIT (1 << 31) /* Bit 31 in Counter-Timer register */
/* The counter timer register has the value offset by 9 bits.
* From sun4m manual:
* When a counter reaches the value in the corresponding limit register,
* the Limit bit is set and the counter is set to 500 nS (i.e. 0x00000200).
*
* To compensate for this add one to the value.
*/
static inline unsigned int timer_value(unsigned int value)
{
return (value + 1) << TIMER_VALUE_SHIFT;
}
extern volatile u32 __iomem *master_l10_counter;
irqreturn_t notrace timer_interrupt(int dummy, void *dev_id);
#ifdef CONFIG_SMP
DECLARE_PER_CPU(struct clock_event_device, sparc32_clockevent);
void register_percpu_ce(int cpu);
#endif
#endif /* !(_SPARC_TIMER_H) */
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