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Linux/arch/loongarch/include/asm/time.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
  4  */
  5 #ifndef _ASM_TIME_H
  6 #define _ASM_TIME_H
  7 
  8 #include <linux/clockchips.h>
  9 #include <linux/clocksource.h>
 10 #include <asm/loongarch.h>
 11 
 12 extern u64 cpu_clock_freq;
 13 extern u64 const_clock_freq;
 14 
 15 extern void save_counter(void);
 16 extern void sync_counter(void);
 17 
 18 static inline unsigned int calc_const_freq(void)
 19 {
 20         unsigned int res;
 21         unsigned int base_freq;
 22         unsigned int cfm, cfd;
 23 
 24         res = read_cpucfg(LOONGARCH_CPUCFG2);
 25         if (!(res & CPUCFG2_LLFTP))
 26                 return 0;
 27 
 28         base_freq = read_cpucfg(LOONGARCH_CPUCFG4);
 29         res = read_cpucfg(LOONGARCH_CPUCFG5);
 30         cfm = res & 0xffff;
 31         cfd = (res >> 16) & 0xffff;
 32 
 33         if (!base_freq || !cfm || !cfd)
 34                 return 0;
 35 
 36         return (base_freq * cfm / cfd);
 37 }
 38 
 39 /*
 40  * Initialize the calling CPU's timer interrupt as clockevent device
 41  */
 42 extern int constant_clockevent_init(void);
 43 extern int constant_clocksource_init(void);
 44 
 45 static inline void clockevent_set_clock(struct clock_event_device *cd,
 46                                         unsigned int clock)
 47 {
 48         clockevents_calc_mult_shift(cd, clock, 4);
 49 }
 50 
 51 #endif /* _ASM_TIME_H */
 52 

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