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
14unsigned long riscv_timebase __ro_after_init;
15EXPORT_SYMBOL_GPL(riscv_timebase);
16
17void __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
34void 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}

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