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/*
* NVRAM variable manipulation (Linux kernel half)
*
* Copyright 2006, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <linux/wrapper.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/mtd/mtd.h>
#include <asm/addrspace.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <typedefs.h>
#include <osl.h>
#include <bcmendian.h>
#include <bcmnvram.h>
#include <sbconfig.h>
#include <sbchipc.h>
#include <sbutils.h>
#include <hndmips.h>
#include <sflash.h>
/* In BSS to minimize text size and page aligned so it can be mmap()-ed */
static char nvram_buf[NVRAM_SPACE] __attribute__((aligned(PAGE_SIZE)));
/* Global SB handle */
extern void *bcm947xx_sbh;
extern spinlock_t bcm947xx_sbh_lock;
static int cfe_env;
extern char *cfe_env_get(char *nv_buf, const char *name);
/* Convenience */
#define sbh bcm947xx_sbh
#define sbh_lock bcm947xx_sbh_lock
/* Probe for NVRAM header */
static void __init
early_nvram_init(void)
{
struct nvram_header *header;
chipcregs_t *cc;
struct sflash *info = NULL;
int i;
uint32 base, off, lim;
u32 *src, *dst;
if ((cc = sb_setcore(sbh, SB_CC, 0)) != NULL) {
base = KSEG1ADDR(SB_FLASH2);
switch (readl(&cc->capabilities) & CC_CAP_FLASH_MASK) {
case PFLASH:
lim = SB_FLASH2_SZ;
break;
case SFLASH_ST:
case SFLASH_AT:
if ((info = sflash_init(sbh,cc)) == NULL)
return;
lim = info->size;
break;
case FLASH_NONE:
default:
return;
}
} else {
/* extif assumed, Stop at 4 MB */
base = KSEG1ADDR(SB_FLASH1);
lim = SB_FLASH1_SZ;
}
/* XXX: hack for supporting the CFE environment stuff on WGT634U */
src = (u32 *) KSEG1ADDR(base + 8 * 1024 * 1024 - 0x2000);
dst = (u32 *) nvram_buf;
if ((lim == 0x02000000) && ((*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 = FLASH_MIN;
while (off <= lim) {
/* Windowed flash access */
header = (struct nvram_header *) KSEG1ADDR(base + off - NVRAM_SPACE);
if (header->magic == NVRAM_MAGIC)
goto found;
off <<= 1;
}
/* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
header = (struct nvram_header *) KSEG1ADDR(base + 4 * 1024);
if (header->magic == NVRAM_MAGIC)
goto found;
header = (struct nvram_header *) KSEG1ADDR(base + 1 * 1024);
if (header->magic == NVRAM_MAGIC)
goto found;
printk("early_nvram_init: NVRAM not found\n");
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++ = ltoh32(*src++);
}
/* Early (before mm or mtd) read-only access to NVRAM */
static char * __init
early_nvram_get(const char *name)
{
char *var, *value, *end, *eq;
if (!name)
return NULL;
/* Too early? */
if (sbh == NULL)
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;
}
static int __init
early_nvram_getall(char *buf, int count)
{
char *var, *end;
int len = 0;
/* Too early? */
if (sbh == NULL)
return -1;
if (!nvram_buf[0])
early_nvram_init();
bzero(buf, count);
/* Write name=value\0 ... \0\0 */
var = &nvram_buf[sizeof(struct nvram_header)];
end = nvram_buf + sizeof(nvram_buf) - 2;
end[0] = end[1] = '\0';
for (; *var; var += strlen(var) + 1) {
if ((count - len) <= (strlen(var) + 1))
break;
len += sprintf(buf + len, "%s", var) + 1;
}
return 0;
}
char *
nvram_get(const char *name)
{
return early_nvram_get(name);
}
int
nvram_getall(char *buf, int count)
{
unsigned long flags;
int ret;
return early_nvram_getall(buf, count);
}
/*
* Search the name=value vars for a specific one and return its value.
* Returns NULL if not found.
*/
char*
getvar(char *vars, const char *name)
{
char *s;
int len;
len = strlen(name);
/* first look in vars[] */
for (s = vars; s && *s;) {
/* CSTYLED */
if ((memcmp(s, name, len) == 0) && (s[len] == '='))
return (&s[len+1]);
while (*s++);
}
/* then query nvram */
return (nvram_get(name));
}
/*
* Search the vars for a specific one and return its value as
* an integer. Returns 0 if not found.
*/
int
getintvar(char *vars, const char *name)
{
char *val;
if ((val = getvar(vars, name)) == NULL)
return (0);
return (simple_strtoul(val, NULL, 0));
}
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