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/* 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 */ |