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 sync_counter(void); 16 17 static inline unsigned int calc_const_freq(void) 18 { 19 unsigned int res; 20 unsigned int base_freq; 21 unsigned int cfm, cfd; 22 23 res = read_cpucfg(LOONGARCH_CPUCFG2); 24 if (!(res & CPUCFG2_LLFTP)) 25 return 0; 26 27 base_freq = read_cpucfg(LOONGARCH_CPUCFG4); 28 res = read_cpucfg(LOONGARCH_CPUCFG5); 29 cfm = res & 0xffff; 30 cfd = (res >> 16) & 0xffff; 31 32 if (!base_freq || !cfm || !cfd) 33 return 0; 34 35 return (base_freq * cfm / cfd); 36 } 37 38 /* 39 * Initialize the calling CPU's timer interrupt as clockevent device 40 */ 41 extern int constant_clockevent_init(void); 42 extern int constant_clocksource_init(void); 43 44 static inline void clockevent_set_clock(struct clock_event_device *cd, 45 unsigned int clock) 46 { 47 clockevents_calc_mult_shift(cd, clock, 4); 48 } 49 50 #endif /* _ASM_TIME_H */ 51