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 <linux/clocksource.h> 12 #include <linux/irqreturn.h> 13 14 #include <asm-generic/percpu.h> 15 16 #include <asm/cpu_type.h> /* For SUN4M_NCPUS */ 17 #include <asm/btfixup.h> 18 19 #define SBUS_CLOCK_RATE 2000000 /* 2MHz */ 20 #define TIMER_VALUE_SHIFT 9 21 #define TIMER_VALUE_MASK 0x3fffff 22 #define TIMER_LIMIT_BIT (1 << 31) /* Bit 31 in Counter-Timer register */ 23 24 /* The counter timer register has the value offset by 9 bits. 25 * From sun4m manual: 26 * When a counter reaches the value in the corresponding limit register, 27 * the Limit bit is set and the counter is set to 500 nS (i.e. 0x00000200). 28 * 29 * To compensate for this add one to the value. 30 */ 31 static inline unsigned int timer_value(unsigned int value) 32 { 33 return (value + 1) << TIMER_VALUE_SHIFT; 34 } 35 36 extern __volatile__ unsigned int *master_l10_counter; 37 38 extern irqreturn_t notrace timer_interrupt(int dummy, void *dev_id); 39 40 #ifdef CONFIG_SMP 41 DECLARE_PER_CPU(struct clock_event_device, sparc32_clockevent); 42 extern void register_percpu_ce(int cpu); 43 #endif 44 45 /* FIXME: Make do_[gs]ettimeofday btfixup calls */ 46 struct timespec; 47 BTFIXUPDEF_CALL(int, bus_do_settimeofday, struct timespec *tv) 48 #define bus_do_settimeofday(tv) BTFIXUP_CALL(bus_do_settimeofday)(tv) 49 50 #endif /* !(_SPARC_TIMER_H) */ 51