| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2012 Regents of the University of California |
| * Copyright (C) 2017 SiFive |
| */ |
| |
| #include <linux/acpi.h> |
| #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> |
| #include <asm/paravirt.h> |
| |
| unsigned long riscv_timebase __ro_after_init; |
| EXPORT_SYMBOL_GPL(riscv_timebase); |
| |
| void __init time_init(void) |
| { |
| struct device_node *cpu; |
| struct acpi_table_rhct *rhct; |
| acpi_status status; |
| u32 prop; |
| |
| if (acpi_disabled) { |
| cpu = of_find_node_by_path("/cpus"); |
| if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) |
| panic("RISC-V system with no 'timebase-frequency' in DTS\n"); |
| |
| of_node_put(cpu); |
| riscv_timebase = prop; |
| of_clk_init(NULL); |
| } else { |
| status = acpi_get_table(ACPI_SIG_RHCT, 0, (struct acpi_table_header **)&rhct); |
| if (ACPI_FAILURE(status)) |
| panic("RISC-V ACPI system with no RHCT table\n"); |
| |
| riscv_timebase = rhct->time_base_freq; |
| acpi_put_table((struct acpi_table_header *)rhct); |
| } |
| |
| lpj_fine = riscv_timebase / HZ; |
| |
| timer_probe(); |
| |
| tick_setup_hrtimer_broadcast(); |
| |
| pv_time_init(); |
| } |