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 * 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 */ 30 extern int rtc_mips_set_time(unsigned long); 31 extern int rtc_mips_set_mmss(unsigned long); 32 33 /* 34 * board specific routines required by time_init(). 35 */ 36 extern 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 */ 42 extern 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 */ 48 extern int (*perf_irq)(void); 49 50 /* 51 * Initialize the calling CPU's compare interrupt as clockevent device 52 */ 53 extern unsigned int __weak get_c0_compare_int(void); 54 extern int r4k_clockevent_init(void); 55 56 static inline int mips_clockevent_init(void) 57 { 58 #ifdef CONFIG_MIPS_MT_SMTC 59 extern int smtc_clockevent_init(void); 60 61 return smtc_clockevent_init(); 62 #elif defined(CONFIG_CEVT_R4K) 63 return r4k_clockevent_init(); 64 #else 65 return -ENXIO; 66 #endif 67 } 68 69 /* 70 * Initialize the count register as a clocksource 71 */ 72 #ifdef CONFIG_CSRC_R4K 73 extern int init_r4k_clocksource(void); 74 #endif 75 76 static inline int init_mips_clocksource(void) 77 { 78 #ifdef CONFIG_CSRC_R4K 79 return init_r4k_clocksource(); 80 #else 81 return 0; 82 #endif 83 } 84 85 static inline void clockevent_set_clock(struct clock_event_device *cd, 86 unsigned int clock) 87 { 88 clockevents_calc_mult_shift(cd, clock, 4); 89 } 90 91 #endif /* _ASM_TIME_H */ 92