45 lines
1005 B
C
45 lines
1005 B
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2012 Regents of the University of California
|
||
|
|
* Copyright (C) 2017 SiFive
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/of_clk.h>
|
||
|
|
#include <linux/clockchips.h>
|
||
|
|
#include <linux/clocksource.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <asm/sbi.h>
|
||
|
|
#include <asm/processor.h>
|
||
|
|
#include <asm/timex.h>
|
||
|
|
|
||
|
|
unsigned long riscv_timebase __ro_after_init;
|
||
|
|
EXPORT_SYMBOL_GPL(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;
|
||
|
|
|
||
|
|
of_clk_init(NULL);
|
||
|
|
timer_probe();
|
||
|
|
|
||
|
|
tick_setup_hrtimer_broadcast();
|
||
|
|
}
|
||
|
|
|
||
|
|
void clocksource_arch_init(struct clocksource *cs)
|
||
|
|
{
|
||
|
|
#ifdef CONFIG_GENERIC_GETTIMEOFDAY
|
||
|
|
cs->vdso_clock_mode = VDSO_CLOCKMODE_ARCHTIMER;
|
||
|
|
#else
|
||
|
|
cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;
|
||
|
|
#endif
|
||
|
|
}
|