/* * Copyright (C) 2012 Regents of the University of California * Copyright (C) 2017 SiFive * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/clocksource.h> #include <linux/delay.h> #include <asm/sbi.h> unsigned long riscv_timebase; void __init time_init(void) { struct device_node *cpu; u32 prop; cpu = of_find_node_by_path("/cpus"); if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); of_node_put(cpu); riscv_timebase = prop; lpj_fine = riscv_timebase / HZ; timer_probe(); }