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50 lines
1.1 KiB
50 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
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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/loongarch.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 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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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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