1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 Regents of the University of California
4 * Copyright (C) 2017 SiFive
7 #include <linux/clocksource.h>
8 #include <linux/delay.h>
10 #include <asm/processor.h>
12 unsigned long riscv_timebase;
13 EXPORT_SYMBOL_GPL(riscv_timebase);
15 void __init time_init(void)
17 struct device_node *cpu;
20 cpu = of_find_node_by_path("/cpus");
21 if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop))
22 panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
24 riscv_timebase = prop;
26 lpj_fine = riscv_timebase / HZ;
30 void clocksource_arch_init(struct clocksource *cs)
32 #ifdef CONFIG_GENERIC_GETTIMEOFDAY
33 cs->vdso_clock_mode = VDSO_CLOCKMODE_ARCHTIMER;
35 cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;