1 /* 2 * timer.h: Definitions for the timer chips on the Sparc. 3 * 4 * Copyright (C) 1995 David S. Miller ([email protected]) 5 */ 6 7 8 #ifndef _SPARC_TIMER_H 9 #define _SPARC_TIMER_H 10 11 #include <asm/system.h> /* For SUN4M_NCPUS */ 12 #include <asm/btfixup.h> 13 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 ;( 20 */ 21 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 26 * L1-A to work. 27 */ 28 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; 34 }; 35 36 #define SUN_TIMER_PHYSADDR 0xf3000000 37 38 extern __volatile__ unsigned int *master_l10_counter; 39 extern __volatile__ unsigned int *master_l10_limit; 40 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) 44 45 #endif /* !(_SPARC_TIMER_H) */ 46