add initial 2.6.28 support for brcm47xx target

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 13909

5 files changed, 856 insertions, 0 deletions

diff --git a/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/cfe_env.c b/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/cfe_env.c
new file mode 100644
index 0000000000..c1d5eeef59
--- /dev/null
+++ b/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/cfe_env.c
@@ -0,0 +1,229 @@
+/*
+ * 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, 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;
+
+}
+
diff --git a/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/include/nvram.h b/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/include/nvram.h
new file mode 100644
index 0000000000..6bb18e8e5f
--- /dev/null
+++ b/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/include/nvram.h
@@ -0,0 +1,37 @@
+/*
+ *  Copyright (C) 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.
+ */
+
+#ifndef __NVRAM_H
+#define __NVRAM_H
+
+struct nvram_header {
+	u32 magic;
+	u32 len;
+	u32 crc_ver_init;	/* 0:7 crc, 8:15 ver, 16:31 sdram_init */
+	u32 config_refresh;	/* 0:15 sdram_config, 16:31 sdram_refresh */
+	u32 config_ncdl;	/* ncdl values for memc */
+};
+
+struct nvram_tuple {
+	char *name;
+	char *value;
+	struct nvram_tuple *next;
+};
+
+#define NVRAM_HEADER		0x48534C46	/* 'FLSH' */
+#define NVRAM_VERSION		1
+#define NVRAM_HEADER_SIZE	20
+#define NVRAM_SPACE		0x8000
+
+#define NVRAM_MAX_VALUE_LEN 255
+#define NVRAM_MAX_PARAM_LEN 64
+
+char *nvram_get(const char *name);
+
+#endif
diff --git a/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/nvram.c b/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/nvram.c
new file mode 100644
index 0000000000..3f32ad9d6e
--- /dev/null
+++ b/target/linux/brcm47xx/files-2.6.28/arch/mips/bcm47xx/nvram.c
@@ -0,0 +1,125 @@
+/*
+ * 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);
diff --git a/target/linux/brcm47xx/files-2.6.28/arch/mips/include/asm/mach-bcm47xx/kernel-entry-init.h b/target/linux/brcm47xx/files-2.6.28/arch/mips/include/asm/mach-bcm47xx/kernel-entry-init.h
new file mode 100644
index 0000000000..7df0dc2b5a
--- /dev/null
+++ b/target/linux/brcm47xx/files-2.6.28/arch/mips/include/asm/mach-bcm47xx/kernel-entry-init.h
@@ -0,0 +1,26 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Embedded Alley Solutions, Inc
+ * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
+ * Copyright (C) 2006 Michael Buesch
+ */
+#ifndef __ASM_MACH_GENERIC_KERNEL_ENTRY_H
+#define __ASM_MACH_GENERIC_KERNEL_ENTRY_H
+
+/* Intentionally empty macro, used in head.S. Override in
+ * arch/mips/mach-xxx/kernel-entry-init.h when necessary.
+ */
+	.macro	kernel_entry_setup
+	.endm
+
+/*
+ * Do SMP slave processor setup necessary before we can savely execute C code.
+ */
+	.macro	smp_slave_setup
+	.endm
+
+
+#endif /* __ASM_MACH_GENERIC_KERNEL_ENTRY_H */
diff --git a/target/linux/brcm47xx/files-2.6.28/drivers/mtd/maps/bcm47xx-flash.c b/target/linux/brcm47xx/files-2.6.28/drivers/mtd/maps/bcm47xx-flash.c
new file mode 100644
index 0000000000..118d4c4fc1
--- /dev/null
+++ b/target/linux/brcm47xx/files-2.6.28/drivers/mtd/maps/bcm47xx-flash.c
@@ -0,0 +1,439 @@
+/*
+ *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
+ *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
+ *
+ *  original functions for finding root filesystem from Mike Baker 
+ *
+ *  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.
+ *
+ *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ * 
+ *  Copyright 2001-2003, 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.
+ *
+ *  Flash mapping for BCM947XX boards
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#ifdef CONFIG_MTD_PARTITIONS
+#include <linux/mtd/partitions.h>
+#endif
+#include <linux/crc32.h>
+#ifdef CONFIG_SSB
+#include <linux/ssb/ssb.h>
+#endif
+#include <asm/io.h>
+
+
+#define TRX_MAGIC	0x30524448	/* "HDR0" */
+#define TRX_VERSION	1
+#define TRX_MAX_LEN	0x3A0000
+#define TRX_NO_HEADER	1		/* Do not write TRX header */	
+#define TRX_GZ_FILES	0x2     /* Contains up to TRX_MAX_OFFSET individual gzip files */
+#define TRX_MAX_OFFSET	3
+
+struct trx_header {
+	u32 magic;		/* "HDR0" */
+	u32 len;		/* Length of file including header */
+	u32 crc32;		/* 32-bit CRC from flag_version to end of file */
+	u32 flag_version;	/* 0:15 flags, 16:31 version */
+	u32 offsets[TRX_MAX_OFFSET];	/* Offsets of partitions from start of header */
+};
+
+#define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
+#define NVRAM_SPACE 0x8000
+#define WINDOW_ADDR 0x1fc00000
+#define WINDOW_SIZE 0x400000
+#define BUSWIDTH 2
+
+#ifdef CONFIG_SSB
+extern struct ssb_bus ssb_bcm47xx;
+#endif
+static struct mtd_info *bcm47xx_mtd;
+
+static void bcm47xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+	if (len==1) {
+		memcpy_fromio(to, map->virt + from, len);
+	} else {
+		int i;
+		u16 *dest = (u16 *) to;
+		u16 *src  = (u16 *) (map->virt + from);
+		for (i = 0; i < (len / 2); i++) {
+			dest[i] = src[i];
+		}
+		if (len & 1)
+			*((u8 *)dest+len-1) = src[i] & 0xff;
+	}
+}
+
+static struct map_info bcm47xx_map = {
+	name: "Physically mapped flash",
+	size: WINDOW_SIZE,
+	bankwidth: BUSWIDTH,
+	phys: WINDOW_ADDR,
+};
+
+#ifdef CONFIG_MTD_PARTITIONS
+
+static struct mtd_partition bcm47xx_parts[] = {
+	{ name: "cfe",	offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
+	{ name: "linux", offset: 0, size: 0, },
+	{ name: "rootfs", offset: 0, size: 0, },
+	{ name: "nvram", offset: 0, size: 0, },
+	{ name: NULL, },
+};
+
+static int __init
+find_cfe_size(struct mtd_info *mtd, size_t size)
+{
+	struct trx_header *trx;
+	unsigned char buf[512];
+	int off;
+	size_t len;
+	int blocksize;
+
+	trx = (struct trx_header *) buf;
+
+	blocksize = mtd->erasesize;
+	if (blocksize < 0x10000)
+		blocksize = 0x10000;
+
+	for (off = (128*1024); off < size; off += blocksize) {
+		memset(buf, 0xe5, sizeof(buf));
+
+		/*
+		 * Read into buffer 
+		 */
+		if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
+		    len != sizeof(buf))
+			continue;
+
+		/* found a TRX header */
+		if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
+			goto found;
+		}
+	}
+
+	printk(KERN_NOTICE
+	       "%s: Couldn't find bootloader size\n",
+	       mtd->name);
+	return -1;
+
+ found:
+	printk(KERN_NOTICE "bootloader size: %d\n", off);
+	return off;
+
+}
+
+/*
+ * Copied from mtdblock.c
+ *
+ * Cache stuff...
+ * 
+ * Since typical flash erasable sectors are much larger than what Linux's
+ * buffer cache can handle, we must implement read-modify-write on flash
+ * sectors for each block write requests.  To avoid over-erasing flash sectors
+ * and to speed things up, we locally cache a whole flash sector while it is
+ * being written to until a different sector is required.
+ */
+
+static void erase_callback(struct erase_info *done)
+{
+	wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
+	wake_up(wait_q);
+}
+
+static int erase_write (struct mtd_info *mtd, unsigned long pos, 
+			int len, const char *buf)
+{
+	struct erase_info erase;
+	DECLARE_WAITQUEUE(wait, current);
+	wait_queue_head_t wait_q;
+	size_t retlen;
+	int ret;
+
+	/*
+	 * First, let's erase the flash block.
+	 */
+
+	init_waitqueue_head(&wait_q);
+	erase.mtd = mtd;
+	erase.callback = erase_callback;
+	erase.addr = pos;
+	erase.len = len;
+	erase.priv = (u_long)&wait_q;
+
+	set_current_state(TASK_INTERRUPTIBLE);
+	add_wait_queue(&wait_q, &wait);
+
+	ret = mtd->erase(mtd, &erase);
+	if (ret) {
+		set_current_state(TASK_RUNNING);
+		remove_wait_queue(&wait_q, &wait);
+		printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
+				     "on \"%s\" failed\n",
+			pos, len, mtd->name);
+		return ret;
+	}
+
+	schedule();  /* Wait for erase to finish. */
+	remove_wait_queue(&wait_q, &wait);
+
+	/*
+	 * Next, writhe data to flash.
+	 */
+
+	ret = mtd->write (mtd, pos, len, &retlen, buf);
+	if (ret)
+		return ret;
+	if (retlen != len)
+		return -EIO;
+	return 0;
+}
+
+
+
+
+static int __init
+find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
+{
+	struct trx_header trx, *trx2;
+	unsigned char buf[512], *block;
+	int off, blocksize;
+	u32 i, crc = ~0;
+	size_t len;
+	struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
+
+	blocksize = mtd->erasesize;
+	if (blocksize < 0x10000)
+		blocksize = 0x10000;
+
+	for (off = (128*1024); off < size; off += blocksize) {
+		memset(&trx, 0xe5, sizeof(trx));
+
+		/*
+		 * Read into buffer 
+		 */
+		if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
+		    len != sizeof(trx))
+			continue;
+
+		/* found a TRX header */
+		if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
+			part->offset = le32_to_cpu(trx.offsets[2]) ? : 
+				le32_to_cpu(trx.offsets[1]);
+			part->size = le32_to_cpu(trx.len); 
+
+			part->size -= part->offset;
+			part->offset += off;
+
+			goto found;
+		}
+	}
+
+	printk(KERN_NOTICE
+	       "%s: Couldn't find root filesystem\n",
+	       mtd->name);
+	return -1;
+
+ found:
+	if (part->size == 0)
+		return 0;
+	
+	if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
+		return 0;
+
+	/* Move the fs outside of the trx */
+	part->size = 0;
+
+	if (trx.len != part->offset + part->size - off) {
+		/* Update the trx offsets and length */
+		trx.len = part->offset + part->size - off;
+	
+		/* Update the trx crc32 */
+		for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
+			if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
+				return 0;
+			crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
+		}
+		trx.crc32 = crc;
+
+		/* read first eraseblock from the trx */
+		block = kmalloc(mtd->erasesize, GFP_KERNEL);
+		trx2 = (struct trx_header *) block;
+		if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
+			printk("Error accessing the first trx eraseblock\n");
+			return 0;
+		}
+		
+		printk("Updating TRX offsets and length:\n");
+		printk("old trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n", trx2->offsets[0], trx2->offsets[1], trx2->offsets[2], trx2->len, trx2->crc32);
+		printk("new trx = [0x%08x, 0x%08x, 0x%08x], len=0x%08x crc32=0x%08x\n",   trx.offsets[0],   trx.offsets[1],   trx.offsets[2],   trx.len, trx.crc32);
+
+		/* Write updated trx header to the flash */
+		memcpy(block, &trx, sizeof(trx));
+		if (mtd->unlock)
+			mtd->unlock(mtd, off, mtd->erasesize);
+		erase_write(mtd, off, mtd->erasesize, block);
+		if (mtd->sync)
+			mtd->sync(mtd);
+		kfree(block);
+		printk("Done\n");
+	}
+	
+	return part->size;
+}
+
+struct mtd_partition * __init
+init_mtd_partitions(struct mtd_info *mtd, size_t size)
+{
+	int cfe_size;
+
+	if ((cfe_size = find_cfe_size(mtd,size)) < 0)
+		return NULL;
+
+	/* boot loader */
+	bcm47xx_parts[0].offset = 0;
+	bcm47xx_parts[0].size   = cfe_size;
+
+	/* nvram */
+	if (cfe_size != 384 * 1024) {
+		bcm47xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
+		bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
+	} else {
+		/* nvram (old 128kb config partition on netgear wgt634u) */
+		bcm47xx_parts[3].offset = bcm47xx_parts[0].size;
+		bcm47xx_parts[3].size   = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
+	}
+
+	/* linux (kernel and rootfs) */
+	if (cfe_size != 384 * 1024) {
+		bcm47xx_parts[1].offset = bcm47xx_parts[0].size;
+		bcm47xx_parts[1].size   = bcm47xx_parts[3].offset - 
+			bcm47xx_parts[1].offset;
+	} else {
+		/* do not count the elf loader, which is on one block */
+		bcm47xx_parts[1].offset = bcm47xx_parts[0].size + 
+			bcm47xx_parts[3].size + mtd->erasesize;
+		bcm47xx_parts[1].size   = size - 
+			bcm47xx_parts[0].size - 
+			(2*bcm47xx_parts[3].size) - 
+			mtd->erasesize;
+	}
+
+	/* find and size rootfs */
+	find_root(mtd,size,&bcm47xx_parts[2]);
+	bcm47xx_parts[2].size = size - bcm47xx_parts[2].offset - bcm47xx_parts[3].size;
+
+	return bcm47xx_parts;
+}
+#endif
+
+int __init init_bcm47xx_map(void)
+{
+#ifdef CONFIG_SSB
+	struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
+#endif
+	size_t size;
+	int ret = 0;
+#ifdef CONFIG_MTD_PARTITIONS
+	struct mtd_partition *parts;
+	int i;
+#endif
+
+#ifdef CONFIG_SSB
+	u32 window = mcore->flash_window;
+	u32 window_size = mcore->flash_window_size;
+
+	printk("flash init: 0x%08x 0x%08x\n", window, window_size);
+	bcm47xx_map.phys = window;
+	bcm47xx_map.size = window_size;
+	bcm47xx_map.virt = ioremap_nocache(window, window_size);
+#else
+	printk("flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
+	bcm47xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
+#endif
+
+	if (!bcm47xx_map.virt) {
+		printk("Failed to ioremap\n");
+		return -EIO;
+	}
+
+	simple_map_init(&bcm47xx_map);
+	
+	if (!(bcm47xx_mtd = do_map_probe("cfi_probe", &bcm47xx_map))) {
+		printk("Failed to do_map_probe\n");
+		iounmap((void *)bcm47xx_map.virt);
+		return -ENXIO;
+	}
+
+	/* override copy_from routine */
+ 	bcm47xx_map.copy_from = bcm47xx_map_copy_from;
+
+	bcm47xx_mtd->owner = THIS_MODULE;
+
+	size = bcm47xx_mtd->size;
+
+	printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
+
+#ifdef CONFIG_MTD_PARTITIONS
+	parts = init_mtd_partitions(bcm47xx_mtd, size);
+	for (i = 0; parts[i].name; i++);
+	ret = add_mtd_partitions(bcm47xx_mtd, parts, i);
+	if (ret) {
+		printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
+		goto fail;
+	}
+#endif
+	return 0;
+
+ fail:
+	if (bcm47xx_mtd)
+		map_destroy(bcm47xx_mtd);
+	if (bcm47xx_map.virt)
+		iounmap((void *)bcm47xx_map.virt);
+	bcm47xx_map.virt = 0;
+	return ret;
+}
+
+void __exit cleanup_bcm47xx_map(void)
+{
+#ifdef CONFIG_MTD_PARTITIONS
+	del_mtd_partitions(bcm47xx_mtd);
+#endif
+	map_destroy(bcm47xx_mtd);
+	iounmap((void *)bcm47xx_map.virt);
+}
+
+module_init(init_bcm47xx_map);
+module_exit(cleanup_bcm47xx_map);