1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Based on Ocelot Linux port, which is 4*4882a593Smuzhiyun * Copyright 2001 MontaVista Software Inc. 5*4882a593Smuzhiyun * Author: jsun@mvista.com or jsun@junsun.net 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Copyright 2003 ICT CAS 8*4882a593Smuzhiyun * Author: Michael Guo <guoyi@ict.ac.cn> 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology 11*4882a593Smuzhiyun * Author: Fuxin Zhang, zhangfx@lemote.com 12*4882a593Smuzhiyun * 13*4882a593Smuzhiyun * Copyright (C) 2009 Lemote Inc. 14*4882a593Smuzhiyun * Author: Wu Zhangjin, wuzhangjin@gmail.com 15*4882a593Smuzhiyun */ 16*4882a593Smuzhiyun #include <linux/export.h> 17*4882a593Smuzhiyun #include <asm/bootinfo.h> 18*4882a593Smuzhiyun #include <asm/fw/fw.h> 19*4882a593Smuzhiyun #include <loongson.h> 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun u32 cpu_clock_freq; 22*4882a593Smuzhiyun EXPORT_SYMBOL(cpu_clock_freq); 23*4882a593Smuzhiyun prom_init_env(void)24*4882a593Smuzhiyunvoid __init prom_init_env(void) 25*4882a593Smuzhiyun { 26*4882a593Smuzhiyun /* pmon passes arguments in 32bit pointers */ 27*4882a593Smuzhiyun unsigned int processor_id; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun cpu_clock_freq = fw_getenvl("cpuclock"); 30*4882a593Smuzhiyun memsize = fw_getenvl("memsize"); 31*4882a593Smuzhiyun highmemsize = fw_getenvl("highmemsize"); 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun if (memsize == 0) 34*4882a593Smuzhiyun memsize = 256; 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun pr_info("memsize=%u, highmemsize=%u\n", memsize, highmemsize); 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun if (cpu_clock_freq == 0) { 39*4882a593Smuzhiyun processor_id = (¤t_cpu_data)->processor_id; 40*4882a593Smuzhiyun switch (processor_id & PRID_REV_MASK) { 41*4882a593Smuzhiyun case PRID_REV_LOONGSON2E: 42*4882a593Smuzhiyun cpu_clock_freq = 533080000; 43*4882a593Smuzhiyun break; 44*4882a593Smuzhiyun case PRID_REV_LOONGSON2F: 45*4882a593Smuzhiyun cpu_clock_freq = 797000000; 46*4882a593Smuzhiyun break; 47*4882a593Smuzhiyun default: 48*4882a593Smuzhiyun cpu_clock_freq = 100000000; 49*4882a593Smuzhiyun break; 50*4882a593Smuzhiyun } 51*4882a593Smuzhiyun } 52*4882a593Smuzhiyun pr_info("CpuClock = %u\n", cpu_clock_freq); 53*4882a593Smuzhiyun } 54