// 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); }