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/*
* BCM947xx nvram variable access
*
* Copyright (C) 2005 Broadcom Corporation
* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
*
* 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/types.h>
#include <linux/module.h>
#include <linux/ssb/ssb.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <asm/addrspace.h>
#include <bcm47xx_nvram.h>
#include <asm/mach-bcm47xx/bcm47xx.h>
static char nvram_buf[NVRAM_SPACE];
static u32 find_nvram_size(u32 end)
{
struct nvram_header *header;
u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
int i;
for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
header = (struct nvram_header *)KSEG1ADDR(end - nvram_sizes[i]);
if (header->magic == NVRAM_HEADER)
return nvram_sizes[i];
}
return 0;
}
/* Probe for NVRAM header */
static int nvram_find_and_copy(u32 base, u32 lim)
{
struct nvram_header *header;
int i;
u32 off;
u32 *src, *dst;
u32 size;
/* TODO: when nvram is on nand flash check for bad blocks first. */
off = FLASH_MIN;
while (off <= lim) {
/* Windowed flash access */
size = find_nvram_size(base + off);
if (size) {
header = (struct nvram_header *)KSEG1ADDR(base + off -
size);
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) {
size = NVRAM_SPACE;
goto found;
}
header = (struct nvram_header *) KSEG1ADDR(base + 1024);
if (header->magic == NVRAM_HEADER) {
size = NVRAM_SPACE;
goto found;
}
pr_err("no nvram found\n");
return -ENXIO;
found:
if (header->len > size)
pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
if (header->len > NVRAM_SPACE)
pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
header->len, NVRAM_SPACE);
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 < size; i += 4)
*dst++ = le32_to_cpu(*src++);
memset(dst, 0x0, NVRAM_SPACE - i);
return 0;
}
#ifdef CONFIG_BCM47XX_SSB
static int nvram_init_ssb(void)
{
struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
u32 base;
u32 lim;
if (mcore->pflash.present) {
base = mcore->pflash.window;
lim = mcore->pflash.window_size;
} else {
pr_err("Couldn't find supported flash memory\n");
return -ENXIO;
}
return nvram_find_and_copy(base, lim);
}
#endif
#ifdef CONFIG_BCM47XX_BCMA
static int nvram_init_bcma(void)
{
struct bcma_drv_cc *cc = &bcm47xx_bus.bcma.bus.drv_cc;
u32 base;
u32 lim;
#ifdef CONFIG_BCMA_NFLASH
if (cc->nflash.boot) {
base = BCMA_SOC_FLASH1;
lim = BCMA_SOC_FLASH1_SZ;
} else
#endif
if (cc->pflash.present) {
base = cc->pflash.window;
lim = cc->pflash.window_size;
#ifdef CONFIG_BCMA_SFLASH
} else if (cc->sflash.present) {
base = cc->sflash.window;
lim = cc->sflash.size;
#endif
} else {
pr_err("Couldn't find supported flash memory\n");
return -ENXIO;
}
return nvram_find_and_copy(base, lim);
}
#endif
static int nvram_init(void)
{
switch (bcm47xx_bus_type) {
#ifdef CONFIG_BCM47XX_SSB
case BCM47XX_BUS_TYPE_SSB:
return nvram_init_ssb();
#endif
#ifdef CONFIG_BCM47XX_BCMA
case BCM47XX_BUS_TYPE_BCMA:
return nvram_init_bcma();
#endif
}
return -ENXIO;
}
int bcm47xx_nvram_getenv(char *name, char *val, size_t val_len)
{
char *var, *value, *end, *eq;
int err;
if (!name)
return -EINVAL;
if (!nvram_buf[0]) {
err = nvram_init();
if (err)
return err;
}
/* 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) {
eq = strchr(var, '=');
if (!eq)
break;
value = eq + 1;
if ((eq - var) == strlen(name) &&
strncmp(var, name, (eq - var)) == 0) {
return snprintf(val, val_len, "%s", value);
}
}
return -ENOENT;
}
EXPORT_SYMBOL(bcm47xx_nvram_getenv);
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