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ca585cf9 KC |
1 | /* |
2 | * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com> | |
3 | * | |
4 | * Modified from arch/mips/pnx833x/common/prom.c. | |
5 | * | |
70342287 RB |
6 | * This program is free software; you can redistribute it and/or modify it |
7 | * under the terms of the GNU General Public License as published by the | |
ca585cf9 KC |
8 | * Free Software Foundation; either version 2 of the License, or (at your |
9 | * option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/serial_reg.h> | |
13 | #include <asm/bootinfo.h> | |
14 | ||
15 | #include <loongson1.h> | |
16 | #include <prom.h> | |
17 | ||
18 | int prom_argc; | |
19 | char **prom_argv, **prom_envp; | |
20 | unsigned long memsize, highmemsize; | |
21 | ||
22 | char *prom_getenv(char *envname) | |
23 | { | |
24 | char **env = prom_envp; | |
25 | int i; | |
26 | ||
27 | i = strlen(envname); | |
28 | ||
29 | while (*env) { | |
30 | if (strncmp(envname, *env, i) == 0 && *(*env+i) == '=') | |
31 | return *env + i + 1; | |
32 | env++; | |
33 | } | |
34 | ||
35 | return 0; | |
36 | } | |
37 | ||
38 | static inline unsigned long env_or_default(char *env, unsigned long dfl) | |
39 | { | |
40 | char *str = prom_getenv(env); | |
41 | return str ? simple_strtol(str, 0, 0) : dfl; | |
42 | } | |
43 | ||
44 | void __init prom_init_cmdline(void) | |
45 | { | |
46 | char *c = &(arcs_cmdline[0]); | |
47 | int i; | |
48 | ||
49 | for (i = 1; i < prom_argc; i++) { | |
50 | strcpy(c, prom_argv[i]); | |
51 | c += strlen(prom_argv[i]); | |
52 | if (i < prom_argc-1) | |
53 | *c++ = ' '; | |
54 | } | |
55 | *c = 0; | |
56 | } | |
57 | ||
58 | void __init prom_init(void) | |
59 | { | |
60 | prom_argc = fw_arg0; | |
61 | prom_argv = (char **)fw_arg1; | |
62 | prom_envp = (char **)fw_arg2; | |
63 | ||
64 | prom_init_cmdline(); | |
65 | ||
66 | memsize = env_or_default("memsize", DEFAULT_MEMSIZE); | |
67 | highmemsize = env_or_default("highmemsize", 0x0); | |
68 | } | |
69 | ||
70 | void __init prom_free_prom_memory(void) | |
71 | { | |
72 | } | |
73 | ||
74 | #define PORT(offset) (u8 *)(KSEG1ADDR(LS1X_UART0_BASE + offset)) | |
75 | ||
76 | void __init prom_putchar(char c) | |
77 | { | |
78 | int timeout; | |
79 | ||
80 | timeout = 1024; | |
81 | ||
82 | while (((readb(PORT(UART_LSR)) & UART_LSR_THRE) == 0) | |
83 | && (timeout-- > 0)) | |
84 | ; | |
85 | ||
86 | writeb(c, PORT(UART_TX)); | |
87 | } |