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 #include <asm/timex.h> 13 14 unsigned long riscv_timebase __ro_after_init; 15 EXPORT_SYMBOL_GPL(riscv_timebase); 16 17 void __init time_init(void) 18 { 19 struct device_node *cpu; 20 u32 prop; 21 22 cpu = of_find_node_by_path("/cpus"); 23 if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) 24 panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); 25 of_node_put(cpu); 26 riscv_timebase = prop; 27 28 lpj_fine = riscv_timebase / HZ; 29 30 of_clk_init(NULL); 31 timer_probe(); 32 } 33 34 void clocksource_arch_init(struct clocksource *cs) 35 { 36 #ifdef CONFIG_GENERIC_GETTIMEOFDAY 37 cs->vdso_clock_mode = VDSO_CLOCKMODE_ARCHTIMER; 38 #else 39 cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE; 40 #endif 41 } 42