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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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75cac781dc
All of Loongson firmwares are passing boot cmdline/env in the manner of YAMON/PMON. Thus we can remove duplicated cmdline initialize code and convert to generic fw method. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: linux-mips@vger.kernel.org Cc: chenhe@lemote.com
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Based on Ocelot Linux port, which is
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* Copyright 2001 MontaVista Software Inc.
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* Author: jsun@mvista.com or jsun@junsun.net
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*
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* Copyright 2003 ICT CAS
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* Author: Michael Guo <guoyi@ict.ac.cn>
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*
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* Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology
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* Author: Fuxin Zhang, zhangfx@lemote.com
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*
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* Copyright (C) 2009 Lemote Inc.
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* Author: Wu Zhangjin, wuzhangjin@gmail.com
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*/
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#include <linux/export.h>
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#include <asm/bootinfo.h>
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#include <asm/fw/fw.h>
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#include <loongson.h>
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u32 cpu_clock_freq;
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EXPORT_SYMBOL(cpu_clock_freq);
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void __init prom_init_env(void)
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{
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/* pmon passes arguments in 32bit pointers */
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unsigned int processor_id;
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cpu_clock_freq = fw_getenvl("cpuclock");
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memsize = fw_getenvl("memsize");
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highmemsize = fw_getenvl("highmemsize");
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if (memsize == 0)
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memsize = 256;
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pr_info("memsize=%u, highmemsize=%u\n", memsize, highmemsize);
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if (cpu_clock_freq == 0) {
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processor_id = (¤t_cpu_data)->processor_id;
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switch (processor_id & PRID_REV_MASK) {
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case PRID_REV_LOONGSON2E:
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cpu_clock_freq = 533080000;
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break;
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case PRID_REV_LOONGSON2F:
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cpu_clock_freq = 797000000;
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break;
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default:
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cpu_clock_freq = 100000000;
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break;
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}
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}
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pr_info("CpuClock = %u\n", cpu_clock_freq);
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}
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