2 * BCM947xx nvram variable access
4 * Copyright 2005, Broadcom Corporation
5 * Copyright 2006, Felix Fietkau <nbd@openwrt.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/interrupt.h>
18 #include <linux/spinlock.h>
19 #include <linux/slab.h>
20 #include <asm/byteorder.h>
21 #include <asm/bootinfo.h>
22 #include <asm/addrspace.h>
24 #include <asm/uaccess.h>
30 #define WINDOW_ADDR 0x1F000000
31 #define WINDOW_SIZE 0x800000
33 static char nvram_buf
[NVRAM_SPACE
];
35 extern char *cfe_env_get(char *nv_buf
, const char *name
);
37 /* Probe for NVRAM header */
38 void __init
early_nvram_init(void)
40 struct nvram_header
*header
;
50 /* XXX: hack for supporting the CFE environment stuff on WGT634U */
52 src
= (u32
*) KSEG1ADDR(base
+ 8 MB
- 0x20000);
53 dst
= (u32
*) nvram_buf
;
55 /* We are looking for the String gOGoBrCm */
56 if ((*src
) == 0x674f476f && (*(src
+ 1)) == 0x4272436d) {
57 printk("early_nvram_init: EasyGate NVRAM found.\n");
59 for (i
= 0; i
< 0x1ff0; i
++) {
60 if (*src
== 0xFFFFFFFF)
71 /* Windowed flash access */
72 header
= (struct nvram_header
*) KSEG1ADDR(base
+ off
- NVRAM_SPACE
);
73 if (header
->magic
== NVRAM_HEADER
)
78 /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
79 header
= (struct nvram_header
*) KSEG1ADDR(base
+ 4096);
80 if (header
->magic
== NVRAM_HEADER
)
83 header
= (struct nvram_header
*) KSEG1ADDR(base
+ 1024);
84 if (header
->magic
== NVRAM_HEADER
)
87 printk("Found no CFE environnment\n");
91 printk("Found CFE environnment\n");
93 dst
= (u32
*) nvram_buf
;
94 for (i
= 0; i
< sizeof(struct nvram_header
); i
+= 4)
96 for (; i
< header
->len
&& i
< NVRAM_SPACE
; i
+= 4)
97 //*dst++ = le32_to_cpu(*src++);
98 *dst
++ = be32_to_cpu(*src
++);
101 char *nvram_get(const char *name
)
103 char *var
, *value
, *end
, *eq
;
112 return cfe_env_get(nvram_buf
, name
);
114 /* Look for name=value and return value */
115 var
= &nvram_buf
[sizeof(struct nvram_header
)];
116 end
= nvram_buf
+ sizeof(nvram_buf
) - 2;
117 end
[0] = end
[1] = '\0';
118 for (; *var
; var
= value
+ strlen(value
) + 1) {
119 if (!(eq
= strchr(var
, '=')))
122 if ((eq
- var
) == strlen(name
) && strncmp(var
, name
, (eq
- var
)) == 0)
129 EXPORT_SYMBOL(nvram_get
);