18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Copyright (C) 2020 Loongson Technology Corporation Limited 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * This program is free software; you can redistribute it and/or modify it 68c2ecf20Sopenharmony_ci * under the terms of the GNU General Public License as published by the 78c2ecf20Sopenharmony_ci * Free Software Foundation; either version 2 of the License, or (at your 88c2ecf20Sopenharmony_ci * option) any later version. 98c2ecf20Sopenharmony_ci */ 108c2ecf20Sopenharmony_ci#ifndef _ASM_TIME_H 118c2ecf20Sopenharmony_ci#define _ASM_TIME_H 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ci#include <linux/clockchips.h> 148c2ecf20Sopenharmony_ci#include <linux/clocksource.h> 158c2ecf20Sopenharmony_ci#include <asm/loongarchregs.h> 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ciextern u64 cpu_clock_freq; 188c2ecf20Sopenharmony_ciextern u64 const_clock_freq; 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ciextern void save_counter(void); 218c2ecf20Sopenharmony_ciextern void sync_counter(void); 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_cistatic inline unsigned int calc_const_freq(void) 248c2ecf20Sopenharmony_ci{ 258c2ecf20Sopenharmony_ci unsigned int res; 268c2ecf20Sopenharmony_ci unsigned int base_freq; 278c2ecf20Sopenharmony_ci unsigned int cfm, cfd; 288c2ecf20Sopenharmony_ci 298c2ecf20Sopenharmony_ci res = read_cpucfg(LOONGARCH_CPUCFG2); 308c2ecf20Sopenharmony_ci if (!(res & CPUCFG2_LLFTP)) 318c2ecf20Sopenharmony_ci return 0; 328c2ecf20Sopenharmony_ci 338c2ecf20Sopenharmony_ci base_freq = read_cpucfg(LOONGARCH_CPUCFG4); 348c2ecf20Sopenharmony_ci res = read_cpucfg(LOONGARCH_CPUCFG5); 358c2ecf20Sopenharmony_ci cfm = res & 0xffff; 368c2ecf20Sopenharmony_ci cfd = (res >> 16) & 0xffff; 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ci if (!base_freq || !cfm || !cfd) 398c2ecf20Sopenharmony_ci return 0; 408c2ecf20Sopenharmony_ci 418c2ecf20Sopenharmony_ci return (base_freq * cfm / cfd); 428c2ecf20Sopenharmony_ci} 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ci/* 458c2ecf20Sopenharmony_ci * Initialize the calling CPU's timer interrupt as clockevent device 468c2ecf20Sopenharmony_ci */ 478c2ecf20Sopenharmony_ciextern int constant_clockevent_init(void); 488c2ecf20Sopenharmony_ciextern int constant_clocksource_init(void); 498c2ecf20Sopenharmony_ci 508c2ecf20Sopenharmony_cistatic inline void clockevent_set_clock(struct clock_event_device *cd, 518c2ecf20Sopenharmony_ci unsigned int clock) 528c2ecf20Sopenharmony_ci{ 538c2ecf20Sopenharmony_ci clockevents_calc_mult_shift(cd, clock, 4); 548c2ecf20Sopenharmony_ci} 558c2ecf20Sopenharmony_ci 568c2ecf20Sopenharmony_ci#endif /* _ASM_TIME_H */ 57