| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Based on Ocelot Linux port, which is |
| * Copyright 2001 MontaVista Software Inc. |
| * Author: jsun@mvista.com or jsun@junsun.net |
| * |
| * Copyright 2003 ICT CAS |
| * Author: Michael Guo <guoyi@ict.ac.cn> |
| * |
| * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology |
| * Author: Fuxin Zhang, zhangfx@lemote.com |
| * |
| * Copyright (C) 2009 Lemote Inc. |
| * Author: Wu Zhangjin, wuzhangjin@gmail.com |
| */ |
| #include <linux/export.h> |
| #include <asm/bootinfo.h> |
| #include <asm/fw/fw.h> |
| #include <loongson.h> |
| |
| u32 cpu_clock_freq; |
| EXPORT_SYMBOL(cpu_clock_freq); |
| |
| void __init prom_init_env(void) |
| { |
| /* pmon passes arguments in 32bit pointers */ |
| unsigned int processor_id; |
| |
| cpu_clock_freq = fw_getenvl("cpuclock"); |
| memsize = fw_getenvl("memsize"); |
| highmemsize = fw_getenvl("highmemsize"); |
| |
| if (memsize == 0) |
| memsize = 256; |
| |
| pr_info("memsize=%u, highmemsize=%u\n", memsize, highmemsize); |
| |
| if (cpu_clock_freq == 0) { |
| processor_id = (¤t_cpu_data)->processor_id; |
| switch (processor_id & PRID_REV_MASK) { |
| case PRID_REV_LOONGSON2E: |
| cpu_clock_freq = 533080000; |
| break; |
| case PRID_REV_LOONGSON2F: |
| cpu_clock_freq = 797000000; |
| break; |
| default: |
| cpu_clock_freq = 100000000; |
| break; |
| } |
| } |
| pr_info("CpuClock = %u\n", cpu_clock_freq); |
| } |
