| /* SPDX-License-Identifier: GPL-2.0 */ | |
| /* | |
| * Copyright (C) 2020-2022 Loongson Technology Corporation Limited | |
| */ | |
| #ifndef _ASM_TIME_H | |
| #define _ASM_TIME_H | |
| #include <linux/clockchips.h> | |
| #include <linux/clocksource.h> | |
| #include <asm/loongarch.h> | |
| extern u64 cpu_clock_freq; | |
| extern u64 const_clock_freq; | |
| extern void save_counter(void); | |
| extern void sync_counter(void); | |
| static inline unsigned int calc_const_freq(void) | |
| { | |
| unsigned int res; | |
| unsigned int base_freq; | |
| unsigned int cfm, cfd; | |
| res = read_cpucfg(LOONGARCH_CPUCFG2); | |
| if (!(res & CPUCFG2_LLFTP)) | |
| return 0; | |
| base_freq = read_cpucfg(LOONGARCH_CPUCFG4); | |
| res = read_cpucfg(LOONGARCH_CPUCFG5); | |
| cfm = res & 0xffff; | |
| cfd = (res >> 16) & 0xffff; | |
| if (!base_freq || !cfm || !cfd) | |
| return 0; | |
| return (base_freq * cfm / cfd); | |
| } | |
| /* | |
| * Initialize the calling CPU's timer interrupt as clockevent device | |
| */ | |
| extern int constant_clockevent_init(void); | |
| extern int constant_clocksource_init(void); | |
| static inline void clockevent_set_clock(struct clock_event_device *cd, | |
| unsigned int clock) | |
| { | |
| clockevents_calc_mult_shift(cd, clock, 4); | |
| } | |
| #endif /* _ASM_TIME_H */ |