1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
3*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive
4*4882a593Smuzhiyun * for more details.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun #include <linux/init.h>
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/string.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <asm/addrspace.h>
13*4882a593Smuzhiyun #include <asm/fw/fw.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun int fw_argc;
16*4882a593Smuzhiyun int *_fw_argv;
17*4882a593Smuzhiyun int *_fw_envp;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #ifndef CONFIG_HAVE_PLAT_FW_INIT_CMDLINE
fw_init_cmdline(void)20*4882a593Smuzhiyun void __init fw_init_cmdline(void)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun int i;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun /* Validate command line parameters. */
25*4882a593Smuzhiyun if ((fw_arg0 >= CKSEG0) || (fw_arg1 < CKSEG0)) {
26*4882a593Smuzhiyun fw_argc = 0;
27*4882a593Smuzhiyun _fw_argv = NULL;
28*4882a593Smuzhiyun } else {
29*4882a593Smuzhiyun fw_argc = (fw_arg0 & 0x0000ffff);
30*4882a593Smuzhiyun _fw_argv = (int *)fw_arg1;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /* Validate environment pointer. */
34*4882a593Smuzhiyun if (fw_arg2 < CKSEG0)
35*4882a593Smuzhiyun _fw_envp = NULL;
36*4882a593Smuzhiyun else
37*4882a593Smuzhiyun _fw_envp = (int *)fw_arg2;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun for (i = 1; i < fw_argc; i++) {
40*4882a593Smuzhiyun strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE);
41*4882a593Smuzhiyun if (i < (fw_argc - 1))
42*4882a593Smuzhiyun strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun #endif
46*4882a593Smuzhiyun
fw_getcmdline(void)47*4882a593Smuzhiyun char * __init fw_getcmdline(void)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun return &(arcs_cmdline[0]);
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
fw_getenv(char * envname)52*4882a593Smuzhiyun char *fw_getenv(char *envname)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun char *result = NULL;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun if (_fw_envp != NULL) {
57*4882a593Smuzhiyun /*
58*4882a593Smuzhiyun * Return a pointer to the given environment variable.
59*4882a593Smuzhiyun * YAMON uses "name", "value" pairs, while U-Boot uses
60*4882a593Smuzhiyun * "name=value".
61*4882a593Smuzhiyun */
62*4882a593Smuzhiyun int i, yamon, index = 0;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun yamon = (strchr(fw_envp(index), '=') == NULL);
65*4882a593Smuzhiyun i = strlen(envname);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun while (fw_envp(index)) {
68*4882a593Smuzhiyun if (strncmp(envname, fw_envp(index), i) == 0) {
69*4882a593Smuzhiyun if (yamon) {
70*4882a593Smuzhiyun result = fw_envp(index + 1);
71*4882a593Smuzhiyun break;
72*4882a593Smuzhiyun } else if (fw_envp(index)[i] == '=') {
73*4882a593Smuzhiyun result = fw_envp(index) + i + 1;
74*4882a593Smuzhiyun break;
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun /* Increment array index. */
79*4882a593Smuzhiyun if (yamon)
80*4882a593Smuzhiyun index += 2;
81*4882a593Smuzhiyun else
82*4882a593Smuzhiyun index += 1;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun return result;
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
fw_getenvl(char * envname)89*4882a593Smuzhiyun unsigned long fw_getenvl(char *envname)
90*4882a593Smuzhiyun {
91*4882a593Smuzhiyun unsigned long envl = 0UL;
92*4882a593Smuzhiyun char *str;
93*4882a593Smuzhiyun int tmp;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun str = fw_getenv(envname);
96*4882a593Smuzhiyun if (str) {
97*4882a593Smuzhiyun tmp = kstrtoul(str, 0, &envl);
98*4882a593Smuzhiyun if (tmp)
99*4882a593Smuzhiyun envl = 0;
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun return envl;
103*4882a593Smuzhiyun }
104