162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later
262306a36Sopenharmony_ci/*
362306a36Sopenharmony_ci * Based on Ocelot Linux port, which is
462306a36Sopenharmony_ci * Copyright 2001 MontaVista Software Inc.
562306a36Sopenharmony_ci * Author: jsun@mvista.com or jsun@junsun.net
662306a36Sopenharmony_ci *
762306a36Sopenharmony_ci * Copyright 2003 ICT CAS
862306a36Sopenharmony_ci * Author: Michael Guo <guoyi@ict.ac.cn>
962306a36Sopenharmony_ci *
1062306a36Sopenharmony_ci * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology
1162306a36Sopenharmony_ci * Author: Fuxin Zhang, zhangfx@lemote.com
1262306a36Sopenharmony_ci *
1362306a36Sopenharmony_ci * Copyright (C) 2009 Lemote Inc.
1462306a36Sopenharmony_ci * Author: Wu Zhangjin, wuzhangjin@gmail.com
1562306a36Sopenharmony_ci */
1662306a36Sopenharmony_ci#include <linux/export.h>
1762306a36Sopenharmony_ci#include <asm/bootinfo.h>
1862306a36Sopenharmony_ci#include <asm/fw/fw.h>
1962306a36Sopenharmony_ci#include <loongson.h>
2062306a36Sopenharmony_ci
2162306a36Sopenharmony_ciu32 cpu_clock_freq;
2262306a36Sopenharmony_ciEXPORT_SYMBOL(cpu_clock_freq);
2362306a36Sopenharmony_ci
2462306a36Sopenharmony_civoid __init prom_init_env(void)
2562306a36Sopenharmony_ci{
2662306a36Sopenharmony_ci	/* pmon passes arguments in 32bit pointers */
2762306a36Sopenharmony_ci	unsigned int processor_id;
2862306a36Sopenharmony_ci
2962306a36Sopenharmony_ci	cpu_clock_freq = fw_getenvl("cpuclock");
3062306a36Sopenharmony_ci	memsize = fw_getenvl("memsize");
3162306a36Sopenharmony_ci	highmemsize = fw_getenvl("highmemsize");
3262306a36Sopenharmony_ci
3362306a36Sopenharmony_ci	if (memsize == 0)
3462306a36Sopenharmony_ci		memsize = 256;
3562306a36Sopenharmony_ci
3662306a36Sopenharmony_ci	pr_info("memsize=%u, highmemsize=%u\n", memsize, highmemsize);
3762306a36Sopenharmony_ci
3862306a36Sopenharmony_ci	if (cpu_clock_freq == 0) {
3962306a36Sopenharmony_ci		processor_id = (&current_cpu_data)->processor_id;
4062306a36Sopenharmony_ci		switch (processor_id & PRID_REV_MASK) {
4162306a36Sopenharmony_ci		case PRID_REV_LOONGSON2E:
4262306a36Sopenharmony_ci			cpu_clock_freq = 533080000;
4362306a36Sopenharmony_ci			break;
4462306a36Sopenharmony_ci		case PRID_REV_LOONGSON2F:
4562306a36Sopenharmony_ci			cpu_clock_freq = 797000000;
4662306a36Sopenharmony_ci			break;
4762306a36Sopenharmony_ci		default:
4862306a36Sopenharmony_ci			cpu_clock_freq = 100000000;
4962306a36Sopenharmony_ci			break;
5062306a36Sopenharmony_ci		}
5162306a36Sopenharmony_ci	}
5262306a36Sopenharmony_ci	pr_info("CpuClock = %u\n", cpu_clock_freq);
5362306a36Sopenharmony_ci}
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