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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 | * | |
12 | * Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology | |
13 | * Author: Wu Zhangjin, wuzj@lemote.com | |
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 { \ | |
32 | if (strncmp(option, (char *)p, strlen(option)) == 0) \ | |
33 | strict_strtol((char *)p + strlen(option"="), \ | |
34 | 10, &res); \ | |
35 | } while (0) | |
36 | ||
37 | void __init prom_init_env(void) | |
38 | { | |
eb11df47 WZ |
39 | /* pmon passes arguments in 32bit pointers */ |
40 | int *_prom_envp; | |
41 | unsigned long bus_clock; | |
42 | unsigned int processor_id; | |
bd92aa01 WZ |
43 | long l; |
44 | ||
45 | /* firmware arguments are initialized in head.S */ | |
46 | _prom_envp = (int *)fw_arg2; | |
47 | ||
48 | l = (long)*_prom_envp; | |
49 | while (l != 0) { | |
50 | parse_even_earlier(bus_clock, "busclock", l); | |
51 | parse_even_earlier(cpu_clock_freq, "cpuclock", l); | |
52 | parse_even_earlier(memsize, "memsize", l); | |
53 | parse_even_earlier(highmemsize, "highmemsize", l); | |
54 | _prom_envp++; | |
55 | l = (long)*_prom_envp; | |
56 | } | |
57 | if (memsize == 0) | |
58 | memsize = 256; | |
eb11df47 WZ |
59 | if (bus_clock == 0) |
60 | bus_clock = 66000000; | |
61 | if (cpu_clock_freq == 0) { | |
62 | processor_id = (¤t_cpu_data)->processor_id; | |
63 | switch (processor_id & PRID_REV_MASK) { | |
64 | case PRID_REV_LOONGSON2E: | |
65 | cpu_clock_freq = 533080000; | |
66 | break; | |
67 | case PRID_REV_LOONGSON2F: | |
68 | cpu_clock_freq = 797000000; | |
69 | break; | |
70 | default: | |
71 | cpu_clock_freq = 100000000; | |
72 | break; | |
73 | } | |
74 | } | |
bd92aa01 WZ |
75 | |
76 | pr_info("busclock=%ld, cpuclock=%ld, memsize=%ld, highmemsize=%ld\n", | |
77 | bus_clock, cpu_clock_freq, memsize, highmemsize); | |
78 | } |