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/clocksource.h> 9 #include <linux/delay.h> 10 #include <asm/sbi.h> 11 #include <asm/processor.h> 12 13 unsigned long riscv_timebase; 14 EXPORT_SYMBOL_GPL(riscv_timebase); 15 16 void __init time_init(void) 17 { 18 struct device_node *cpu; 19 u32 prop; 20 21 cpu = of_find_node_by_path("/cpus"); 22 if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) 23 panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); 24 of_node_put(cpu); 25 riscv_timebase = prop; 26 27 lpj_fine = riscv_timebase / HZ; 28 29 of_clk_init(NULL); 30 timer_probe(); 31 } 32 33 void clocksource_arch_init(struct clocksource *cs) 34 { 35 #ifdef CONFIG_GENERIC_GETTIMEOFDAY 36 cs->vdso_clock_mode = VDSO_CLOCKMODE_ARCHTIMER; 37 #else 38 cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE; 39 #endif 40 } 41