mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 22:23:27 +00:00
294 lines
7.3 KiB
Diff
294 lines
7.3 KiB
Diff
The Netgear wgt634u uses a different format for storing the
|
|
configuration. This patch is needed to read out the correct
|
|
configuration. The cfe_env.c file uses a different method way to read
|
|
out the configuration than the in kernel cfe config reader.
|
|
|
|
--- a/drivers/firmware/broadcom/Makefile
|
|
+++ b/drivers/firmware/broadcom/Makefile
|
|
@@ -1 +1 @@
|
|
-obj-$(CONFIG_BCM47XX_NVRAM) += bcm47xx_nvram.o
|
|
+obj-$(CONFIG_BCM47XX_NVRAM) += bcm47xx_nvram.o cfe_env.o
|
|
--- /dev/null
|
|
+++ b/drivers/firmware/broadcom/cfe_env.c
|
|
@@ -0,0 +1,228 @@
|
|
+/*
|
|
+ * CFE environment variable access
|
|
+ *
|
|
+ * Copyright 2001-2003, 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/kernel.h>
|
|
+#include <linux/string.h>
|
|
+#include <asm/io.h>
|
|
+#include <asm/uaccess.h>
|
|
+
|
|
+#define NVRAM_SIZE (0x1ff0)
|
|
+static char _nvdata[NVRAM_SIZE];
|
|
+static char _valuestr[256];
|
|
+
|
|
+/*
|
|
+ * TLV types. These codes are used in the "type-length-value"
|
|
+ * encoding of the items stored in the NVRAM device (flash or EEPROM)
|
|
+ *
|
|
+ * The layout of the flash/nvram is as follows:
|
|
+ *
|
|
+ * <type> <length> <data ...> <type> <length> <data ...> <type_end>
|
|
+ *
|
|
+ * The type code of "ENV_TLV_TYPE_END" marks the end of the list.
|
|
+ * The "length" field marks the length of the data section, not
|
|
+ * including the type and length fields.
|
|
+ *
|
|
+ * Environment variables are stored as follows:
|
|
+ *
|
|
+ * <type_env> <length> <flags> <name> = <value>
|
|
+ *
|
|
+ * If bit 0 (low bit) is set, the length is an 8-bit value.
|
|
+ * If bit 0 (low bit) is clear, the length is a 16-bit value
|
|
+ *
|
|
+ * Bit 7 set indicates "user" TLVs. In this case, bit 0 still
|
|
+ * indicates the size of the length field.
|
|
+ *
|
|
+ * Flags are from the constants below:
|
|
+ *
|
|
+ */
|
|
+#define ENV_LENGTH_16BITS 0x00 /* for low bit */
|
|
+#define ENV_LENGTH_8BITS 0x01
|
|
+
|
|
+#define ENV_TYPE_USER 0x80
|
|
+
|
|
+#define ENV_CODE_SYS(n,l) (((n)<<1)|(l))
|
|
+#define ENV_CODE_USER(n,l) ((((n)<<1)|(l)) | ENV_TYPE_USER)
|
|
+
|
|
+/*
|
|
+ * The actual TLV types we support
|
|
+ */
|
|
+
|
|
+#define ENV_TLV_TYPE_END 0x00
|
|
+#define ENV_TLV_TYPE_ENV ENV_CODE_SYS(0,ENV_LENGTH_8BITS)
|
|
+
|
|
+/*
|
|
+ * Environment variable flags
|
|
+ */
|
|
+
|
|
+#define ENV_FLG_NORMAL 0x00 /* normal read/write */
|
|
+#define ENV_FLG_BUILTIN 0x01 /* builtin - not stored in flash */
|
|
+#define ENV_FLG_READONLY 0x02 /* read-only - cannot be changed */
|
|
+
|
|
+#define ENV_FLG_MASK 0xFF /* mask of attributes we keep */
|
|
+#define ENV_FLG_ADMIN 0x100 /* lets us internally override permissions */
|
|
+
|
|
+
|
|
+/* *********************************************************************
|
|
+ * _nvram_read(buffer,offset,length)
|
|
+ *
|
|
+ * Read data from the NVRAM device
|
|
+ *
|
|
+ * Input parameters:
|
|
+ * buffer - destination buffer
|
|
+ * offset - offset of data to read
|
|
+ * length - number of bytes to read
|
|
+ *
|
|
+ * Return value:
|
|
+ * number of bytes read, or <0 if error occured
|
|
+ ********************************************************************* */
|
|
+static int
|
|
+_nvram_read(unsigned char *nv_buf, unsigned char *buffer, int offset, int length)
|
|
+{
|
|
+ int i;
|
|
+ if (offset > NVRAM_SIZE)
|
|
+ return -1;
|
|
+
|
|
+ for ( i = 0; i < length; i++) {
|
|
+ buffer[i] = ((volatile unsigned char*)nv_buf)[offset + i];
|
|
+ }
|
|
+ return length;
|
|
+}
|
|
+
|
|
+
|
|
+static char*
|
|
+_strnchr(const char *dest,int c,size_t cnt)
|
|
+{
|
|
+ while (*dest && (cnt > 0)) {
|
|
+ if (*dest == c) return (char *) dest;
|
|
+ dest++;
|
|
+ cnt--;
|
|
+ }
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+
|
|
+
|
|
+/*
|
|
+ * Core support API: Externally visible.
|
|
+ */
|
|
+
|
|
+/*
|
|
+ * Get the value of an NVRAM variable
|
|
+ * @param name name of variable to get
|
|
+ * @return value of variable or NULL if undefined
|
|
+ */
|
|
+
|
|
+char *cfe_env_get(unsigned char *nv_buf, const char *name)
|
|
+{
|
|
+ int size;
|
|
+ unsigned char *buffer;
|
|
+ unsigned char *ptr;
|
|
+ unsigned char *envval;
|
|
+ unsigned int reclen;
|
|
+ unsigned int rectype;
|
|
+ int offset;
|
|
+ int flg;
|
|
+
|
|
+ if (!strcmp(name, "nvram_type"))
|
|
+ return "cfe";
|
|
+
|
|
+ size = NVRAM_SIZE;
|
|
+ buffer = &_nvdata[0];
|
|
+
|
|
+ ptr = buffer;
|
|
+ offset = 0;
|
|
+
|
|
+ /* Read the record type and length */
|
|
+ if (_nvram_read(nv_buf, ptr,offset,1) != 1) {
|
|
+ goto error;
|
|
+ }
|
|
+
|
|
+ while ((*ptr != ENV_TLV_TYPE_END) && (size > 1)) {
|
|
+
|
|
+ /* Adjust pointer for TLV type */
|
|
+ rectype = *(ptr);
|
|
+ offset++;
|
|
+ size--;
|
|
+
|
|
+ /*
|
|
+ * Read the length. It can be either 1 or 2 bytes
|
|
+ * depending on the code
|
|
+ */
|
|
+ if (rectype & ENV_LENGTH_8BITS) {
|
|
+ /* Read the record type and length - 8 bits */
|
|
+ if (_nvram_read(nv_buf, ptr,offset,1) != 1) {
|
|
+ goto error;
|
|
+ }
|
|
+ reclen = *(ptr);
|
|
+ size--;
|
|
+ offset++;
|
|
+ }
|
|
+ else {
|
|
+ /* Read the record type and length - 16 bits, MSB first */
|
|
+ if (_nvram_read(nv_buf, ptr,offset,2) != 2) {
|
|
+ goto error;
|
|
+ }
|
|
+ reclen = (((unsigned int) *(ptr)) << 8) + (unsigned int) *(ptr+1);
|
|
+ size -= 2;
|
|
+ offset += 2;
|
|
+ }
|
|
+
|
|
+ if (reclen > size)
|
|
+ break; /* should not happen, bad NVRAM */
|
|
+
|
|
+ switch (rectype) {
|
|
+ case ENV_TLV_TYPE_ENV:
|
|
+ /* Read the TLV data */
|
|
+ if (_nvram_read(nv_buf, ptr,offset,reclen) != reclen)
|
|
+ goto error;
|
|
+ flg = *ptr++;
|
|
+ envval = (unsigned char *) _strnchr(ptr,'=',(reclen-1));
|
|
+ if (envval) {
|
|
+ *envval++ = '\0';
|
|
+ memcpy(_valuestr,envval,(reclen-1)-(envval-ptr));
|
|
+ _valuestr[(reclen-1)-(envval-ptr)] = '\0';
|
|
+#if 0
|
|
+ printk(KERN_INFO "NVRAM:%s=%s\n", ptr, _valuestr);
|
|
+#endif
|
|
+ if(!strcmp(ptr, name)){
|
|
+ return _valuestr;
|
|
+ }
|
|
+ if((strlen(ptr) > 1) && !strcmp(&ptr[1], name))
|
|
+ return _valuestr;
|
|
+ }
|
|
+ break;
|
|
+
|
|
+ default:
|
|
+ /* Unknown TLV type, skip it. */
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * Advance to next TLV
|
|
+ */
|
|
+
|
|
+ size -= (int)reclen;
|
|
+ offset += reclen;
|
|
+
|
|
+ /* Read the next record type */
|
|
+ ptr = buffer;
|
|
+ if (_nvram_read(nv_buf, ptr,offset,1) != 1)
|
|
+ goto error;
|
|
+ }
|
|
+
|
|
+error:
|
|
+ return NULL;
|
|
+
|
|
+}
|
|
+
|
|
--- a/drivers/firmware/broadcom/bcm47xx_nvram.c
|
|
+++ b/drivers/firmware/broadcom/bcm47xx_nvram.c
|
|
@@ -37,6 +37,8 @@ struct nvram_header {
|
|
static char nvram_buf[NVRAM_SPACE];
|
|
static size_t nvram_len;
|
|
static const u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
|
|
+static int cfe_env;
|
|
+extern char *cfe_env_get(char *nv_buf, const char *name);
|
|
|
|
static u32 find_nvram_size(void __iomem *end)
|
|
{
|
|
@@ -66,6 +68,26 @@ static int nvram_find_and_copy(void __io
|
|
return -EEXIST;
|
|
}
|
|
|
|
+ cfe_env = 0;
|
|
+
|
|
+ /* XXX: hack for supporting the CFE environment stuff on WGT634U */
|
|
+ if (lim >= 8 * 1024 * 1024) {
|
|
+ src = (u32 *)(iobase + 8 * 1024 * 1024 - 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 0;
|
|
+ }
|
|
+ }
|
|
+
|
|
/* TODO: when nvram is on nand flash check for bad blocks first. */
|
|
off = FLASH_MIN;
|
|
while (off <= lim) {
|
|
@@ -180,6 +202,13 @@ int bcm47xx_nvram_getenv(const char *nam
|
|
if (!name)
|
|
return -EINVAL;
|
|
|
|
+ if (cfe_env) {
|
|
+ value = cfe_env_get(nvram_buf, name);
|
|
+ if (!value)
|
|
+ return -ENOENT;
|
|
+ return snprintf(val, val_len, "%s", value);
|
|
+ }
|
|
+
|
|
if (!nvram_len) {
|
|
err = nvram_init();
|
|
if (err)
|