diff options
Diffstat (limited to 'arch/loongarch/include/asm/time.h')
| -rw-r--r-- | arch/loongarch/include/asm/time.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/time.h b/arch/loongarch/include/asm/time.h new file mode 100644 index 0000000000..037a2d1b8f --- /dev/null +++ b/arch/loongarch/include/asm/time.h @@ -0,0 +1,51 @@ +/* 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 */ |