1/* 2 * Copyright (C) 2001, 2002, MontaVista Software Inc. 3 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net 4 * Copyright (c) 2003 Maciej W. Rozycki 5 * 6 * include/asm-mips/time.h 7 * header file for the new style time.c file and time services. 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14#ifndef _ASM_TIME_H 15#define _ASM_TIME_H 16 17#include <linux/rtc.h> 18#include <linux/spinlock.h> 19#include <linux/clockchips.h> 20#include <linux/clocksource.h> 21 22extern spinlock_t rtc_lock; 23 24/* 25 * RTC ops. By default, they point to weak no-op RTC functions. 26 * rtc_mips_set_time - reverse the above translation and set time to RTC. 27 * rtc_mips_set_mmss - similar to rtc_set_time, but only min and sec need 28 * to be set. Used by RTC sync-up. 29 */ 30extern int rtc_mips_set_time(unsigned long); 31extern int rtc_mips_set_mmss(unsigned long); 32 33/* 34 * board specific routines required by time_init(). 35 */ 36extern void plat_time_init(void); 37 38/* 39 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible 40 * counter as a timer interrupt source. 41 */ 42extern unsigned int mips_hpt_frequency; 43 44/* 45 * The performance counter IRQ on MIPS is a close relative to the timer IRQ 46 * so it lives here. 47 */ 48extern int (*perf_irq)(void); 49 50/* 51 * Initialize the calling CPU's compare interrupt as clockevent device 52 */ 53#ifdef CONFIG_CEVT_R4K_LIB 54extern unsigned int __weak get_c0_compare_int(void); 55extern int r4k_clockevent_init(void); 56#endif 57 58static inline int mips_clockevent_init(void) 59{ 60#ifdef CONFIG_MIPS_MT_SMTC 61 extern int smtc_clockevent_init(void); 62 63 return smtc_clockevent_init(); 64#elif defined(CONFIG_CEVT_R4K) 65 return r4k_clockevent_init(); 66#else 67 return -ENXIO; 68#endif 69} 70 71/* 72 * Initialize the count register as a clocksource 73 */ 74#ifdef CONFIG_CSRC_R4K_LIB 75extern int init_r4k_clocksource(void); 76#endif 77 78static inline int init_mips_clocksource(void) 79{ 80#ifdef CONFIG_CSRC_R4K 81 return init_r4k_clocksource(); 82#else 83 return 0; 84#endif 85} 86 87static inline void clocksource_set_clock(struct clocksource *cs, 88 unsigned int clock) 89{ 90 clocksource_calc_mult_shift(cs, clock, 4); 91} 92 93static inline void clockevent_set_clock(struct clock_event_device *cd, 94 unsigned int clock) 95{ 96 clockevents_calc_mult_shift(cd, clock, 4); 97} 98 99#endif /* _ASM_TIME_H */ 100