time.h (1617B)
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 18extern spinlock_t rtc_lock; 19 20/* 21 * board specific routines required by time_init(). 22 */ 23extern 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 */ 29extern 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 */ 35extern int (*perf_irq)(void); 36extern int __weak get_c0_perfcount_int(void); 37 38/* 39 * Initialize the calling CPU's compare interrupt as clockevent device 40 */ 41extern unsigned int get_c0_compare_int(void); 42extern int r4k_clockevent_init(void); 43 44static 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 */ 56extern int init_r4k_clocksource(void); 57 58static 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 67static 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 */