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 } 28