mirror of https://gitee.com/openkylin/linux.git
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
|
/*
|
||
|
|
* 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 init_clockevent(void)
|
||
|
|
{
|
||
|
|
timer_probe();
|
||
|
|
csr_set(sie, SIE_STIE);
|
||
|
|
}
|
||
|
|
|
||
|
|
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");
|
||
|
|
riscv_timebase = prop;
|
||
|
|
|
||
|
|
lpj_fine = riscv_timebase / HZ;
|
||
|
|
|
||
|
|
init_clockevent();
|
||
|
|
}
|