You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
|
|
* BCM947xx nvram variable access
|
|
*
|
|
* Copyright 2005, Broadcom Corporation
|
|
* Copyright 2006, Felix Fietkau <nbd@openwrt.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ssb/ssb.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/byteorder.h>
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
#include <nvram.h>
|
|
|
|
#define MB * 1048576
|
|
extern struct ssb_bus ssb;
|
|
|
|
static char nvram_buf[NVRAM_SPACE];
|
|
static int cfe_env;
|
|
extern char *cfe_env_get(char *nv_buf, const char *name);
|
|
|
|
/* Probe for NVRAM header */
|
|
static void __init early_nvram_init(void)
|
|
{
|
|
struct ssb_mipscore *mcore = &ssb.mipscore;
|
|
struct nvram_header *header;
|
|
int i;
|
|
u32 base, lim, off;
|
|
u32 *src, *dst;
|
|
|
|
base = mcore->flash_window;
|
|
lim = mcore->flash_window_size;
|
|
cfe_env = 0;
|
|
|
|
|
|
/* XXX: hack for supporting the CFE environment stuff on WGT634U */
|
|
if (lim >= 8 MB) {
|
|
src = (u32 *) KSEG1ADDR(base + 8 MB - 0x2000);
|
|
dst = (u32 *) nvram_buf;
|
|
|
|
if ((*src & 0xff00ff) == 0x000001) {
|
|
printk("early_nvram_init: WGT634U NVRAM found.\n");
|
|
|
|
for (i = 0; i < 0x1ff0; i++) {
|
|
if (*src == 0xFFFFFFFF)
|
|
break;
|
|
*dst++ = *src++;
|
|
}
|
|
cfe_env = 1;
|
|
return;
|
|
}
|
|
}
|
|
|
|
off = 0x20000;
|
|
while (off <= lim) {
|
|
/* Windowed flash access */
|
|
header = (struct nvram_header *) KSEG1ADDR(base + off - NVRAM_SPACE);
|
|
if (header->magic == NVRAM_HEADER)
|
|
goto found;
|
|
off <<= 1;
|
|
}
|
|
|
|
/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
|
|
header = (struct nvram_header *) KSEG1ADDR(base + 4096);
|
|
if (header->magic == NVRAM_HEADER)
|
|
goto found;
|
|
|
|
header = (struct nvram_header *) KSEG1ADDR(base + 1024);
|
|
if (header->magic == NVRAM_HEADER)
|
|
goto found;
|
|
|
|
return;
|
|
|
|
found:
|
|
src = (u32 *) header;
|
|
dst = (u32 *) nvram_buf;
|
|
for (i = 0; i < sizeof(struct nvram_header); i += 4)
|
|
*dst++ = *src++;
|
|
for (; i < header->len && i < NVRAM_SPACE; i += 4)
|
|
*dst++ = le32_to_cpu(*src++);
|
|
}
|
|
|
|
char *nvram_get(const char *name)
|
|
{
|
|
char *var, *value, *end, *eq;
|
|
|
|
if (!name)
|
|
return NULL;
|
|
|
|
if (!nvram_buf[0])
|
|
early_nvram_init();
|
|
|
|
if (cfe_env)
|
|
return cfe_env_get(nvram_buf, name);
|
|
|
|
/* Look for name=value and return value */
|
|
var = &nvram_buf[sizeof(struct nvram_header)];
|
|
end = nvram_buf + sizeof(nvram_buf) - 2;
|
|
end[0] = end[1] = '\0';
|
|
for (; *var; var = value + strlen(value) + 1) {
|
|
if (!(eq = strchr(var, '=')))
|
|
break;
|
|
value = eq + 1;
|
|
if ((eq - var) == strlen(name) && strncmp(var, name, (eq - var)) == 0)
|
|
return value;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
EXPORT_SYMBOL(nvram_get);
|