b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Copyright (C) 2012 Regents of the University of California |
| 4 | * Copyright (C) 2017 SiFive |
| 5 | */ |
| 6 | |
| 7 | #include <linux/of_clk.h> |
| 8 | #include <linux/clockchips.h> |
| 9 | #include <linux/clocksource.h> |
| 10 | #include <linux/delay.h> |
| 11 | #include <asm/sbi.h> |
| 12 | #include <asm/processor.h> |
| 13 | |
| 14 | unsigned long riscv_timebase; |
| 15 | EXPORT_SYMBOL_GPL(riscv_timebase); |
| 16 | |
| 17 | void __init time_init(void) |
| 18 | { |
| 19 | struct device_node *cpu; |
| 20 | u32 prop; |
| 21 | |
| 22 | cpu = of_find_node_by_path("/cpus"); |
| 23 | if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) |
| 24 | panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); |
| 25 | of_node_put(cpu); |
| 26 | riscv_timebase = prop; |
| 27 | |
| 28 | lpj_fine = riscv_timebase / HZ; |
| 29 | |
| 30 | of_clk_init(NULL); |
| 31 | timer_probe(); |
| 32 | |
| 33 | tick_setup_hrtimer_broadcast(); |
| 34 | } |