| /* |
| * 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(); |
| } |