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305 lines
7.6 KiB
305 lines
7.6 KiB
The Netgear wgt634u uses a different format for storing the
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configuration. This patch is needed to read out the correct
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configuration. The cfe_env.c file uses a different method way to read
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out the configuration than the in kernel cfe config reader.
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--- a/arch/mips/bcm47xx/Makefile
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+++ b/arch/mips/bcm47xx/Makefile
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@@ -3,4 +3,4 @@
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# under Linux.
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#
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-obj-y += gpio.o irq.o nvram.o prom.o serial.o setup.o time.o bus.o sprom.o
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+obj-y += gpio.o irq.o nvram.o prom.o serial.o setup.o time.o bus.o sprom.o cfe_env.o
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--- /dev/null
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+++ b/arch/mips/bcm47xx/cfe_env.c
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@@ -0,0 +1,229 @@
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+/*
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+ * CFE environment variable access
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+ *
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+ * Copyright 2001-2003, Broadcom Corporation
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+ * Copyright 2006, Felix Fietkau <nbd@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/kernel.h>
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+#include <linux/string.h>
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+#include <asm/io.h>
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+#include <asm/uaccess.h>
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+
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+#define NVRAM_SIZE (0x1ff0)
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+static char _nvdata[NVRAM_SIZE];
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+static char _valuestr[256];
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+
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+/*
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+ * TLV types. These codes are used in the "type-length-value"
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+ * encoding of the items stored in the NVRAM device (flash or EEPROM)
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+ *
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+ * The layout of the flash/nvram is as follows:
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+ *
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+ * <type> <length> <data ...> <type> <length> <data ...> <type_end>
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+ *
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+ * The type code of "ENV_TLV_TYPE_END" marks the end of the list.
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+ * The "length" field marks the length of the data section, not
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+ * including the type and length fields.
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+ *
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+ * Environment variables are stored as follows:
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+ *
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+ * <type_env> <length> <flags> <name> = <value>
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+ *
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+ * If bit 0 (low bit) is set, the length is an 8-bit value.
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+ * If bit 0 (low bit) is clear, the length is a 16-bit value
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+ *
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+ * Bit 7 set indicates "user" TLVs. In this case, bit 0 still
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+ * indicates the size of the length field.
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+ *
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+ * Flags are from the constants below:
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+ *
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+ */
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+#define ENV_LENGTH_16BITS 0x00 /* for low bit */
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+#define ENV_LENGTH_8BITS 0x01
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+
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+#define ENV_TYPE_USER 0x80
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+
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+#define ENV_CODE_SYS(n,l) (((n)<<1)|(l))
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+#define ENV_CODE_USER(n,l) ((((n)<<1)|(l)) | ENV_TYPE_USER)
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+
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+/*
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+ * The actual TLV types we support
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+ */
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+
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+#define ENV_TLV_TYPE_END 0x00
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+#define ENV_TLV_TYPE_ENV ENV_CODE_SYS(0,ENV_LENGTH_8BITS)
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+
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+/*
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+ * Environment variable flags
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+ */
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+
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+#define ENV_FLG_NORMAL 0x00 /* normal read/write */
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+#define ENV_FLG_BUILTIN 0x01 /* builtin - not stored in flash */
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+#define ENV_FLG_READONLY 0x02 /* read-only - cannot be changed */
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+
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+#define ENV_FLG_MASK 0xFF /* mask of attributes we keep */
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+#define ENV_FLG_ADMIN 0x100 /* lets us internally override permissions */
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+
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+
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+/* *********************************************************************
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+ * _nvram_read(buffer,offset,length)
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+ *
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+ * Read data from the NVRAM device
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+ *
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+ * Input parameters:
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+ * buffer - destination buffer
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+ * offset - offset of data to read
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+ * length - number of bytes to read
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+ *
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+ * Return value:
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+ * number of bytes read, or <0 if error occured
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+ ********************************************************************* */
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+static int
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+_nvram_read(unsigned char *nv_buf, unsigned char *buffer, int offset, int length)
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+{
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+ int i;
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+ if (offset > NVRAM_SIZE)
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+ return -1;
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+
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+ for ( i = 0; i < length; i++) {
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+ buffer[i] = ((volatile unsigned char*)nv_buf)[offset + i];
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+ }
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+ return length;
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+}
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+
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+
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+static char*
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+_strnchr(const char *dest,int c,size_t cnt)
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+{
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+ while (*dest && (cnt > 0)) {
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+ if (*dest == c) return (char *) dest;
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+ dest++;
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+ cnt--;
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+ }
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+ return NULL;
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+}
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+
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+
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+
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+/*
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+ * Core support API: Externally visible.
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+ */
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+
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+/*
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+ * Get the value of an NVRAM variable
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+ * @param name name of variable to get
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+ * @return value of variable or NULL if undefined
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+ */
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+
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+char*
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+cfe_env_get(unsigned char *nv_buf, char* name)
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+{
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+ int size;
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+ unsigned char *buffer;
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+ unsigned char *ptr;
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+ unsigned char *envval;
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+ unsigned int reclen;
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+ unsigned int rectype;
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+ int offset;
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+ int flg;
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+
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+ if (!strcmp(name, "nvram_type"))
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+ return "cfe";
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+
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+ size = NVRAM_SIZE;
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+ buffer = &_nvdata[0];
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+
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+ ptr = buffer;
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+ offset = 0;
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+
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+ /* Read the record type and length */
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+ if (_nvram_read(nv_buf, ptr,offset,1) != 1) {
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+ goto error;
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+ }
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+
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+ while ((*ptr != ENV_TLV_TYPE_END) && (size > 1)) {
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+
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+ /* Adjust pointer for TLV type */
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+ rectype = *(ptr);
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+ offset++;
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+ size--;
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+
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+ /*
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+ * Read the length. It can be either 1 or 2 bytes
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+ * depending on the code
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+ */
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+ if (rectype & ENV_LENGTH_8BITS) {
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+ /* Read the record type and length - 8 bits */
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+ if (_nvram_read(nv_buf, ptr,offset,1) != 1) {
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+ goto error;
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+ }
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+ reclen = *(ptr);
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+ size--;
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+ offset++;
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+ }
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+ else {
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+ /* Read the record type and length - 16 bits, MSB first */
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+ if (_nvram_read(nv_buf, ptr,offset,2) != 2) {
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+ goto error;
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+ }
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+ reclen = (((unsigned int) *(ptr)) << 8) + (unsigned int) *(ptr+1);
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+ size -= 2;
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+ offset += 2;
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+ }
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+
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+ if (reclen > size)
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+ break; /* should not happen, bad NVRAM */
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+
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+ switch (rectype) {
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+ case ENV_TLV_TYPE_ENV:
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+ /* Read the TLV data */
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+ if (_nvram_read(nv_buf, ptr,offset,reclen) != reclen)
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+ goto error;
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+ flg = *ptr++;
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+ envval = (unsigned char *) _strnchr(ptr,'=',(reclen-1));
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+ if (envval) {
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+ *envval++ = '\0';
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+ memcpy(_valuestr,envval,(reclen-1)-(envval-ptr));
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+ _valuestr[(reclen-1)-(envval-ptr)] = '\0';
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+#if 0
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+ printk(KERN_INFO "NVRAM:%s=%s\n", ptr, _valuestr);
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+#endif
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+ if(!strcmp(ptr, name)){
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+ return _valuestr;
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+ }
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+ if((strlen(ptr) > 1) && !strcmp(&ptr[1], name))
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+ return _valuestr;
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+ }
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+ break;
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+
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+ default:
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+ /* Unknown TLV type, skip it. */
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+ break;
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+ }
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+
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+ /*
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+ * Advance to next TLV
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+ */
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+
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+ size -= (int)reclen;
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+ offset += reclen;
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+
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+ /* Read the next record type */
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+ ptr = buffer;
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+ if (_nvram_read(nv_buf, ptr,offset,1) != 1)
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+ goto error;
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+ }
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+
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+error:
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+ return NULL;
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+
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+}
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+
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--- a/arch/mips/bcm47xx/nvram.c
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+++ b/arch/mips/bcm47xx/nvram.c
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@@ -23,6 +23,8 @@
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#include <asm/mach-bcm47xx/bus.h>
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static char nvram_buf[NVRAM_SPACE];
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+static int cfe_env;
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+extern char *cfe_env_get(char *nv_buf, const char *name);
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/* Probe for NVRAM header */
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static void early_nvram_init_pflash(void)
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@@ -59,6 +61,25 @@ static void early_nvram_init_pflash(void
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break;
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#endif
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}
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+ cfe_env = 0;
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+
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+ /* XXX: hack for supporting the CFE environment stuff on WGT634U */
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+ if (lim >= 8 * 1024 * 1024) {
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+ src = (u32 *) KSEG1ADDR(base + 8 * 1024 * 1024 - 0x2000);
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+ dst = (u32 *) nvram_buf;
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+
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+ if ((*src & 0xff00ff) == 0x000001) {
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+ printk("early_nvram_init: WGT634U NVRAM found.\n");
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+
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+ for (i = 0; i < 0x1ff0; i++) {
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+ if (*src == 0xFFFFFFFF)
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+ break;
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+ *dst++ = *src++;
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+ }
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+ cfe_env = 1;
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+ return;
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+ }
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+ }
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off = FLASH_MIN;
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while (off <= lim) {
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@@ -181,6 +202,12 @@ int nvram_getenv(char *name, char *val,
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if (!nvram_buf[0])
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early_nvram_init();
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+ if (cfe_env) {
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+ value = cfe_env_get(nvram_buf, name);
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+ snprintf(val, val_len, "%s", value);
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+ return 0;
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+ }
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+
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/* Look for name=value and return value */
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var = &nvram_buf[sizeof(struct nvram_header)];
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end = nvram_buf + sizeof(nvram_buf) - 2;
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@@ -209,6 +236,9 @@ char *nvram_get(const char *name)
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if (!nvram_buf[0])
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early_nvram_init();
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+ if (cfe_env)
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+ return cfe_env_get(nvram_buf, name);
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+
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/* Look for name=value and return value */
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var = &nvram_buf[sizeof(struct nvram_header)];
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end = nvram_buf + sizeof(nvram_buf) - 2;
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