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 22 extern spinlock_t rtc_lock; 23 24 /* 25 * board specific routines required by time_init(). 26 */ 27 extern void plat_time_init(void); 28 29 /* 30 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible 31 * counter as a timer interrupt source. 32 */ 33 extern unsigned int mips_hpt_frequency; 34 35 /* 36 * The performance counter IRQ on MIPS is a close relative to the timer IRQ 37 * so it lives here. 38 */ 39 extern int (*perf_irq)(void); 40 extern int __weak get_c0_perfcount_int(void); 41 42 /* 43 * Initialize the calling CPU's compare interrupt as clockevent device 44 */ 45 extern unsigned int get_c0_compare_int(void); 46 extern int r4k_clockevent_init(void); 47 48 static inline int mips_clockevent_init(void) 49 { 50 #ifdef CONFIG_CEVT_R4K 51 return r4k_clockevent_init(); 52 #else 53 return -ENXIO; 54 #endif 55 } 56 57 /* 58 * Initialize the count register as a clocksource 59 */ 60 extern int init_r4k_clocksource(void); 61 62 static inline int init_mips_clocksource(void) 63 { 64 #ifdef CONFIG_CSRC_R4K 65 return init_r4k_clocksource(); 66 #else 67 return 0; 68 #endif 69 } 70 71 static inline void clockevent_set_clock(struct clock_event_device *cd, 72 unsigned int clock) 73 { 74 clockevents_calc_mult_shift(cd, clock, 4); 75 } 76 77 #endif /* _ASM_TIME_H */ 78