arch/riscv/kernel/time.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  * Copyright (C) 2017 SiFive
   5  */
   6
   7 #include <linux/clocksource.h>
   8 #include <linux/delay.h>
   9 #include <asm/sbi.h>
  10
  11 unsigned long riscv_timebase;
  12
  13 void __init time_init(void)
  14 {
  15         struct device_node *cpu;
  16         u32 prop;
  17
  18         cpu = of_find_node_by_path("/cpus");
  19         if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop))
  20                 panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
  21         of_node_put(cpu);
  22         riscv_timebase = prop;
  23
  24         lpj_fine = riscv_timebase / HZ;
  25         timer_probe();
  26 }