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author | Huacai Chen <chenhuacai@loongson.cn> | 2022-05-31 13:04:11 +0300 |
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committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-06-03 15:09:28 +0300 |
commit | b738c106f7355e318ca47a3b981688efe1bc12fb (patch) | |
tree | d9aabd9d80b50bf2ec0f4d029a72b61bacda4d5e /arch/loongarch/include/asm/time.h | |
parent | 5b0b14e550a006b4d093619e7517923872bcc218 (diff) | |
download | linux-b738c106f7355e318ca47a3b981688efe1bc12fb.tar.xz |
LoongArch: Add other common headers
Add some other common headers for basic LoongArch support.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/include/asm/time.h')
-rw-r--r-- | arch/loongarch/include/asm/time.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/time.h b/arch/loongarch/include/asm/time.h new file mode 100644 index 000000000000..2eae219301d0 --- /dev/null +++ b/arch/loongarch/include/asm/time.h @@ -0,0 +1,50 @@ +/* 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 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 */ |