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/of_clk.h>
8 #include <linux/clocksource.h>
9 #include <linux/delay.h>
11 #include <asm/processor.h>
12 #include <asm/timex.h>
14 unsigned long riscv_timebase __ro_after_init;
15 EXPORT_SYMBOL_GPL(riscv_timebase);
17 void __init time_init(void)
19 struct device_node *cpu;
22 cpu = of_find_node_by_path("/cpus");
23 if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop))
24 panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
26 riscv_timebase = prop;
28 lpj_fine = riscv_timebase / HZ;
34 void clocksource_arch_init(struct clocksource *cs)
36 #ifdef CONFIG_GENERIC_GETTIMEOFDAY
37 cs->vdso_clock_mode = VDSO_CLOCKMODE_ARCHTIMER;
39 cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;