diff options
Diffstat (limited to 'arch/riscv/kernel/time.c')
| -rw-r--r-- | arch/riscv/kernel/time.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c new file mode 100644 index 000000000..1cf21db4f --- /dev/null +++ b/arch/riscv/kernel/time.c @@ -0,0 +1,44 @@ +// 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 +} |