| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2012 Regents of the University of California |
| 4 | * Copyright (C) 2017 SiFive |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #include <linux/clocksource.h> |
| 8 | #include <linux/delay.h> |
| 9 | #include <asm/sbi.h> |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 10 | #include <asm/processor.h> |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 11 | |
| 12 | unsigned long riscv_timebase; |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 13 | EXPORT_SYMBOL_GPL(riscv_timebase); |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 14 | |
| 15 | void __init time_init(void) |
| 16 | { |
| 17 | struct device_node *cpu; |
| 18 | u32 prop; |
| 19 | |
| 20 | cpu = of_find_node_by_path("/cpus"); |
| 21 | if (!cpu || of_property_read_u32(cpu, "timebase-frequency", &prop)) |
| 22 | panic(KERN_WARNING "RISC-V system with no 'timebase-frequency' in DTS\n"); |
| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 23 | of_node_put(cpu); |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 24 | riscv_timebase = prop; |
| 25 | |
| 26 | lpj_fine = riscv_timebase / HZ; |
| 27 | timer_probe(); |
| 28 | } |