1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2001, 2002, MontaVista Software Inc. 4 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net 5 * Copyright (c) 2003 Maciej W. Rozycki 6 * 7 * include/asm-mips/time.h 8 * header file for the new style time.c file and time services. 9 */ 10 #ifndef _ASM_TIME_H 11 #define _ASM_TIME_H 12 13 #include <linux/rtc.h> 14 #include <linux/spinlock.h> 15 #include <linux/clockchips.h> 16 #include <linux/clocksource.h> 17 18 extern spinlock_t rtc_lock; 19 20 /* 21 * board specific routines required by time_init(). 22 */ 23 extern void plat_time_init(void); 24 25 /* 26 * mips_hpt_frequency - must be set if you intend to use an R4k-compatible 27 * counter as a timer interrupt source. 28 */ 29 extern unsigned int mips_hpt_frequency; 30 31 /* 32 * The performance counter IRQ on MIPS is a close relative to the timer IRQ 33 * so it lives here. 34 */ 35 extern int (*perf_irq)(void); 36 extern int __weak get_c0_perfcount_int(void); 37 38 /* 39 * Initialize the calling CPU's compare interrupt as clockevent device 40 */ 41 extern unsigned int get_c0_compare_int(void); 42 extern int r4k_clockevent_init(void); 43 44 static inline int mips_clockevent_init(void) 45 { 46 #ifdef CONFIG_CEVT_R4K 47 return r4k_clockevent_init(); 48 #else 49 return -ENXIO; 50 #endif 51 } 52 53 /* 54 * Initialize the count register as a clocksource 55 */ 56 extern int init_r4k_clocksource(void); 57 58 static inline int init_mips_clocksource(void) 59 { 60 #ifdef CONFIG_CSRC_R4K 61 return init_r4k_clocksource(); 62 #else 63 return 0; 64 #endif 65 } 66 67 static inline void clockevent_set_clock(struct clock_event_device *cd, 68 unsigned int clock) 69 { 70 clockevents_calc_mult_shift(cd, clock, 4); 71 } 72 73 #endif /* _ASM_TIME_H */ 74