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 EXPORT_SYMBOL_GPL(riscv_timebase);
  13
  14 void __init time_init(void)
  15 {
  16         struct device_node *cpu;
  17         u32 prop;
  18
  19         cpu = of_find_node_by_path("/cpus");
  20         if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop))
  21                 panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
  22         of_node_put(cpu);
  23         riscv_timebase = prop;
  24
  25         lpj_fine = riscv_timebase / HZ;
  26         timer_probe();
  27 }