1 /*
2 * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
3 *
4 * Modified from arch/mips/pnx833x/common/prom.c.
5 *
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
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
prom_getenv(char * envname)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
env_or_default(char * env,unsigned long dfl)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
prom_init_cmdline(void)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
prom_init(void)58 void __init prom_init(void)
59 {
60 void __iomem *uart_base;
61 prom_argc = fw_arg0;
62 prom_argv = (char **)fw_arg1;
63 prom_envp = (char **)fw_arg2;
64
65 prom_init_cmdline();
66
67 memsize = env_or_default("memsize", DEFAULT_MEMSIZE);
68 highmemsize = env_or_default("highmemsize", 0x0);
69
70 if (strstr(arcs_cmdline, "console=ttyS3"))
71 uart_base = ioremap_nocache(LS1X_UART3_BASE, 0x0f);
72 else if (strstr(arcs_cmdline, "console=ttyS2"))
73 uart_base = ioremap_nocache(LS1X_UART2_BASE, 0x0f);
74 else if (strstr(arcs_cmdline, "console=ttyS1"))
75 uart_base = ioremap_nocache(LS1X_UART1_BASE, 0x0f);
76 else
77 uart_base = ioremap_nocache(LS1X_UART0_BASE, 0x0f);
78 setup_8250_early_printk_port((unsigned long)uart_base, 0, 0);
79 }
80
prom_free_prom_memory(void)81 void __init prom_free_prom_memory(void)
82 {
83 }
84