projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| bd92aa01 WZ |
1 | /* |
| 2 | * Based on Ocelot Linux port, which is | |
| 3 | * Copyright 2001 MontaVista Software Inc. | |
| 4 | * Author: jsun@mvista.com or jsun@junsun.net | |
| 5 | * | |
| 6 | * Copyright 2003 ICT CAS | |
| 7 | * Author: Michael Guo <guoyi@ict.ac.cn> | |
| 8 | * | |
| 9 | * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology | |
| 10 | * Author: Fuxin Zhang, zhangfx@lemote.com | |
| 11 | * | |
| f7a904df WZ |
12 | * Copyright (C) 2009 Lemote Inc. |
| 13 | * Author: Wu Zhangjin, wuzhangjin@gmail.com | |
| bd92aa01 WZ |
14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify it | |
| 16 | * under the terms of the GNU General Public License as published by the | |
| 17 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 18 | * option) any later version. | |
| 19 | */ | |
| f8ede0f7 WZ |
20 | #include <linux/module.h> |
| 21 | ||
| bd92aa01 WZ |
22 | #include <asm/bootinfo.h> |
| 23 | ||
| 5e983ff6 WZ |
24 | #include <loongson.h> |
| 25 | ||
| eb11df47 | 26 | unsigned long cpu_clock_freq; |
| f8ede0f7 | 27 | EXPORT_SYMBOL(cpu_clock_freq); |
| bd92aa01 WZ |
28 | unsigned long memsize, highmemsize; |
| 29 | ||
| bd92aa01 WZ |
30 | #define parse_even_earlier(res, option, p) \ |
| 31 | do { \ | |
| c87444af RB |
32 | unsigned int tmp __maybe_unused; \ |
| 33 | \ | |
| bd92aa01 | 34 | if (strncmp(option, (char *)p, strlen(option)) == 0) \ |
| c87444af | 35 | tmp = strict_strtol((char *)p + strlen(option"="), 10, &res); \ |
| bd92aa01 WZ |
36 | } while (0) |
| 37 | ||
| 38 | void __init prom_init_env(void) | |
| 39 | { | |
| eb11df47 WZ |
40 | /* pmon passes arguments in 32bit pointers */ |
| 41 | int *_prom_envp; | |
| 42 | unsigned long bus_clock; | |
| 43 | unsigned int processor_id; | |
| bd92aa01 WZ |
44 | long l; |
| 45 | ||
| 46 | /* firmware arguments are initialized in head.S */ | |
| 47 | _prom_envp = (int *)fw_arg2; | |
| 48 | ||
| 49 | l = (long)*_prom_envp; | |
| 50 | while (l != 0) { | |
| 51 | parse_even_earlier(bus_clock, "busclock", l); | |
| 52 | parse_even_earlier(cpu_clock_freq, "cpuclock", l); | |
| 53 | parse_even_earlier(memsize, "memsize", l); | |
| 54 | parse_even_earlier(highmemsize, "highmemsize", l); | |
| 55 | _prom_envp++; | |
| 56 | l = (long)*_prom_envp; | |
| 57 | } | |
| 58 | if (memsize == 0) | |
| 59 | memsize = 256; | |
| eb11df47 WZ |
60 | if (bus_clock == 0) |
| 61 | bus_clock = 66000000; | |
| 62 | if (cpu_clock_freq == 0) { | |
| 63 | processor_id = (¤t_cpu_data)->processor_id; | |
| 64 | switch (processor_id & PRID_REV_MASK) { | |
| 65 | case PRID_REV_LOONGSON2E: | |
| 66 | cpu_clock_freq = 533080000; | |
| 67 | break; | |
| 68 | case PRID_REV_LOONGSON2F: | |
| 69 | cpu_clock_freq = 797000000; | |
| 70 | break; | |
| 71 | default: | |
| 72 | cpu_clock_freq = 100000000; | |
| 73 | break; | |
| 74 | } | |
| 75 | } | |
| bd92aa01 WZ |
76 | |
| 77 | pr_info("busclock=%ld, cpuclock=%ld, memsize=%ld, highmemsize=%ld\n", | |
| 78 | bus_clock, cpu_clock_freq, memsize, highmemsize); | |
| 79 | } |