2 * timer.h: Definitions for the timer chips on the Sparc.
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
11 #include <asm/system.h> /* For SUN4M_NCPUS */
12 #include <asm/btfixup.h>
14 /* Timer structures. The interrupt timer has two properties which
15 * are the counter (which is handled in do_timer in sched.c) and the limit.
16 * This limit is where the timer's counter 'wraps' around. Oddly enough,
17 * the sun4c timer when it hits the limit wraps back to 1 and not zero
18 * thus when calculating the value at which it will fire a microsecond you
19 * must adjust by one. Thanks SUN for designing such great hardware ;(
22 /* Note that I am only going to use the timer that interrupts at
23 * Sparc IRQ 10. There is another one available that can fire at
24 * IRQ 14. Currently it is left untouched, we keep the PROM's limit
25 * register value and let the prom take these interrupts. This allows
29 struct sun4c_timer_info
{
30 __volatile__
unsigned int cur_count10
;
31 __volatile__
unsigned int timer_limit10
;
32 __volatile__
unsigned int cur_count14
;
33 __volatile__
unsigned int timer_limit14
;
36 #define SUN_TIMER_PHYSADDR 0xf3000000
38 extern __volatile__
unsigned int *master_l10_counter
;
39 extern __volatile__
unsigned int *master_l10_limit
;
41 /* FIXME: Make do_[gs]ettimeofday btfixup calls */
42 BTFIXUPDEF_CALL(int, bus_do_settimeofday
, struct timespec
*tv
)
43 #define bus_do_settimeofday(tv) BTFIXUP_CALL(bus_do_settimeofday)(tv)
45 #endif /* !(_SPARC_TIMER_H) */