diff options
Diffstat (limited to 'arch/mips/loongson2ef/common/env.c')
| -rw-r--r-- | arch/mips/loongson2ef/common/env.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/mips/loongson2ef/common/env.c b/arch/mips/loongson2ef/common/env.c new file mode 100644 index 000000000..6f20bdf9b --- /dev/null +++ b/arch/mips/loongson2ef/common/env.c @@ -0,0 +1,53 @@ +// 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); +} |