add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/kernel/time.c
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@@ -1,23 +1,18 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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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/of_clk.h>
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+#include <linux/clockchips.h>
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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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+#include <asm/processor.h>
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 unsigned long riscv_timebase;
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+EXPORT_SYMBOL_GPL(riscv_timebase);
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 void __init time_init(void)
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 {
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@@ -27,10 +22,22 @@
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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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 	of_clk_init(NULL);
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 	timer_probe();
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+
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+	tick_setup_hrtimer_broadcast();
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+}
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+
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+void clocksource_arch_init(struct clocksource *cs)
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+{
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+#ifdef CONFIG_GENERIC_GETTIMEOFDAY
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+	cs->vdso_clock_mode = VDSO_CLOCKMODE_ARCHTIMER;
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+#else
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+	cs->vdso_clock_mode = VDSO_CLOCKMODE_NONE;
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+#endif
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 }