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57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020 Loongson Technology Corporation Limited
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef _ASM_TIME_H
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#define _ASM_TIME_H
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#include <linux/clockchips.h>
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#include <linux/clocksource.h>
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#include <asm/loongarchregs.h>
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extern u64 cpu_clock_freq;
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extern u64 const_clock_freq;
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extern void save_counter(void);
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extern void sync_counter(void);
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static inline unsigned int calc_const_freq(void)
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{
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unsigned int res;
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unsigned int base_freq;
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unsigned int cfm, cfd;
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res = read_cpucfg(LOONGARCH_CPUCFG2);
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if (!(res & CPUCFG2_LLFTP))
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return 0;
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base_freq = read_cpucfg(LOONGARCH_CPUCFG4);
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res = read_cpucfg(LOONGARCH_CPUCFG5);
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cfm = res & 0xffff;
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cfd = (res >> 16) & 0xffff;
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if (!base_freq || !cfm || !cfd)
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return 0;
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else
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return (base_freq * cfm / cfd);
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}
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/*
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* Initialize the calling CPU's timer interrupt as clockevent device
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*/
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extern int constant_clockevent_init(void);
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extern int constant_clocksource_init(void);
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static inline void clockevent_set_clock(struct clock_event_device *cd,
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unsigned int clock)
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{
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clockevents_calc_mult_shift(cd, clock, 4);
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}
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#endif /* _ASM_TIME_H */
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