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/of_clk.h> 8 #include <linux/clockchips.h> 9 #include <linux/clocksource.h> 10 #include <linux/delay.h> 11 #include <asm/sbi.h> 12 #include <asm/processor.h> 13 #include <asm/timex.h> 14 15 unsigned long riscv_timebase __ro_after_init; 16 EXPORT_SYMBOL_GPL(riscv_timebase); 17 18 void __init time_init(void) 19 { 20 struct device_node *cpu; 21 u32 prop; 22 23 cpu = of_find_node_by_path("/cpus"); 24 if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) 25 panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); 26 of_node_put(cpu); 27 riscv_timebase = prop; 28 29 lpj_fine = riscv_timebase / HZ; 30 31 of_clk_init(NULL); 32 timer_probe(); 33 34 tick_setup_hrtimer_broadcast(); 35 } 36