linux-vybrid_public/arch/sparc/include/asm/timer_32.h

/*
 * 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 <asm/system.h>  /* For SUN4M_NCPUS */
#include <asm/btfixup.h>

/* Timer structures. The interrupt timer has two properties which
 * are the counter (which is handled in do_timer in sched.c) and the limit.
 * This limit is where the timer's counter 'wraps' around. Oddly enough,
 * the sun4c timer when it hits the limit wraps back to 1 and not zero
 * thus when calculating the value at which it will fire a microsecond you
 * must adjust by one.  Thanks SUN for designing such great hardware ;(
 */

/* Note that I am only going to use the timer that interrupts at
 * Sparc IRQ 10.  There is another one available that can fire at
 * IRQ 14. Currently it is left untouched, we keep the PROM's limit
 * register value and let the prom take these interrupts.  This allows
 * L1-A to work.
 */

struct sun4c_timer_info {
  __volatile__ unsigned int cur_count10;
  __volatile__ unsigned int timer_limit10;
  __volatile__ unsigned int cur_count14;
  __volatile__ unsigned int timer_limit14;
};

#define SUN_TIMER_PHYSADDR   0xf3000000

extern __volatile__ unsigned int *master_l10_counter;
extern __volatile__ unsigned int *master_l10_limit;

/* FIXME: Make do_[gs]ettimeofday btfixup calls */
BTFIXUPDEF_CALL(int, bus_do_settimeofday, struct timespec *tv)
#define bus_do_settimeofday(tv) BTFIXUP_CALL(bus_do_settimeofday)(tv)

#endif /* !(_SPARC_TIMER_H) */