80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
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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. & Insititute 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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <asm/bootinfo.h>
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#include <loongson.h>
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unsigned long cpu_clock_freq;
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EXPORT_SYMBOL(cpu_clock_freq);
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unsigned long memsize, highmemsize;
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#define parse_even_earlier(res, option, p) \
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do { \
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unsigned int tmp __maybe_unused; \
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\
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if (strncmp(option, (char *)p, strlen(option)) == 0) \
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tmp = strict_strtol((char *)p + strlen(option"="), 10, &res); \
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} while (0)
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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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int *_prom_envp;
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unsigned long bus_clock;
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unsigned int processor_id;
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long l;
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/* firmware arguments are initialized in head.S */
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_prom_envp = (int *)fw_arg2;
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l = (long)*_prom_envp;
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while (l != 0) {
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parse_even_earlier(bus_clock, "busclock", l);
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parse_even_earlier(cpu_clock_freq, "cpuclock", l);
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parse_even_earlier(memsize, "memsize", l);
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parse_even_earlier(highmemsize, "highmemsize", l);
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_prom_envp++;
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l = (long)*_prom_envp;
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}
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if (memsize == 0)
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memsize = 256;
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if (bus_clock == 0)
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bus_clock = 66000000;
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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("busclock=%ld, cpuclock=%ld, memsize=%ld, highmemsize=%ld\n",
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bus_clock, cpu_clock_freq, memsize, highmemsize);
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}
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