mirror of https://gitee.com/openkylin/linux.git
35 lines
1009 B
C
35 lines
1009 B
C
/*
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* Copyright (C) 2012 Regents of the University of California
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* Copyright (C) 2017 SiFive
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clocksource.h>
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#include <linux/delay.h>
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#include <asm/sbi.h>
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unsigned long riscv_timebase;
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void __init time_init(void)
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{
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struct device_node *cpu;
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u32 prop;
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cpu = of_find_node_by_path("/cpus");
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if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop))
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panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n");
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of_node_put(cpu);
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riscv_timebase = prop;
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lpj_fine = riscv_timebase / HZ;
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timer_probe();
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}
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