419 lines
11 KiB
C
419 lines
11 KiB
C
/*
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* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
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* Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.org)
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*
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* original functions for finding root filesystem from Mike Baker
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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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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Copyright 2001-2003, Broadcom Corporation
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* All Rights Reserved.
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*
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* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
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* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
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* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
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*
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* Flash mapping for BCM947XX boards
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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/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#ifdef CONFIG_MTD_PARTITIONS
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#include <linux/mtd/partitions.h>
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#endif
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#include <linux/crc32.h>
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#ifdef CONFIG_SSB
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#include <linux/ssb/ssb.h>
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#endif
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#include <asm/io.h>
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#define TRX_MAGIC 0x30524448 /* "HDR0" */
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#define TRX_VERSION 1
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#define TRX_MAX_LEN 0x3A0000
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#define TRX_NO_HEADER 1 /* Do not write TRX header */
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#define TRX_GZ_FILES 0x2 /* Contains up to TRX_MAX_OFFSET individual gzip files */
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#define TRX_MAX_OFFSET 3
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struct trx_header {
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u32 magic; /* "HDR0" */
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u32 len; /* Length of file including header */
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u32 crc32; /* 32-bit CRC from flag_version to end of file */
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u32 flag_version; /* 0:15 flags, 16:31 version */
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u32 offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
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};
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#define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
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#define NVRAM_SPACE 0x8000
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#define WINDOW_ADDR 0x1fc00000
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#define WINDOW_SIZE 0x400000
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#define BUSWIDTH 2
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#ifdef CONFIG_SSB
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extern struct ssb_bus ssb;
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#endif
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static struct mtd_info *bcm947xx_mtd;
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static struct map_info bcm947xx_map = {
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name: "Physically mapped flash",
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size: WINDOW_SIZE,
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bankwidth: BUSWIDTH,
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phys: WINDOW_ADDR,
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};
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#ifdef CONFIG_MTD_PARTITIONS
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static struct mtd_partition bcm947xx_parts[] = {
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{ name: "cfe", offset: 0, size: 0, mask_flags: MTD_WRITEABLE, },
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{ name: "linux", offset: 0, size: 0, },
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{ name: "rootfs", offset: 0, size: 0, },
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{ name: "nvram", offset: 0, size: 0, },
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{ name: NULL, },
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};
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static int __init
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find_cfe_size(struct mtd_info *mtd, size_t size)
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{
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struct trx_header *trx;
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unsigned char buf[512];
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int off;
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size_t len;
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int blocksize;
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trx = (struct trx_header *) buf;
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blocksize = mtd->erasesize;
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if (blocksize < 0x10000)
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blocksize = 0x10000;
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for (off = (128*1024); off < size; off += blocksize) {
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memset(buf, 0xe5, sizeof(buf));
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/*
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* Read into buffer
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*/
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if (mtd->read(mtd, off, sizeof(buf), &len, buf) ||
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len != sizeof(buf))
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continue;
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/* found a TRX header */
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if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
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goto found;
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}
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}
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printk(KERN_NOTICE
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"%s: Couldn't find bootloader size\n",
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mtd->name);
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return -1;
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found:
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printk(KERN_NOTICE "bootloader size: %d\n", off);
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return off;
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}
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/*
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* Copied from mtdblock.c
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*
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* Cache stuff...
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*
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* Since typical flash erasable sectors are much larger than what Linux's
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* buffer cache can handle, we must implement read-modify-write on flash
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* sectors for each block write requests. To avoid over-erasing flash sectors
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* and to speed things up, we locally cache a whole flash sector while it is
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* being written to until a different sector is required.
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*/
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static void erase_callback(struct erase_info *done)
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{
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wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
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wake_up(wait_q);
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}
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static int erase_write (struct mtd_info *mtd, unsigned long pos,
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int len, const char *buf)
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{
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struct erase_info erase;
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DECLARE_WAITQUEUE(wait, current);
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wait_queue_head_t wait_q;
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size_t retlen;
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int ret;
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/*
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* First, let's erase the flash block.
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*/
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init_waitqueue_head(&wait_q);
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erase.mtd = mtd;
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erase.callback = erase_callback;
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erase.addr = pos;
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erase.len = len;
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erase.priv = (u_long)&wait_q;
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&wait_q, &wait);
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ret = mtd->erase(mtd, &erase);
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if (ret) {
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set_current_state(TASK_RUNNING);
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remove_wait_queue(&wait_q, &wait);
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printk (KERN_WARNING "erase of region [0x%lx, 0x%x] "
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"on \"%s\" failed\n",
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pos, len, mtd->name);
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return ret;
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}
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schedule(); /* Wait for erase to finish. */
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remove_wait_queue(&wait_q, &wait);
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/*
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* Next, writhe data to flash.
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*/
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ret = mtd->write (mtd, pos, len, &retlen, buf);
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if (ret)
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return ret;
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if (retlen != len)
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return -EIO;
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return 0;
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}
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static int __init
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find_root(struct mtd_info *mtd, size_t size, struct mtd_partition *part)
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{
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struct trx_header trx, *trx2;
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unsigned char buf[512], *block;
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int off, blocksize;
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u32 i, crc = ~0;
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size_t len;
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struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
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blocksize = mtd->erasesize;
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if (blocksize < 0x10000)
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blocksize = 0x10000;
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for (off = (128*1024); off < size; off += blocksize) {
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memset(&trx, 0xe5, sizeof(trx));
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/*
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* Read into buffer
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*/
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if (mtd->read(mtd, off, sizeof(trx), &len, (char *) &trx) ||
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len != sizeof(trx))
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continue;
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/* found a TRX header */
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if (le32_to_cpu(trx.magic) == TRX_MAGIC) {
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part->offset = le32_to_cpu(trx.offsets[2]) ? :
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le32_to_cpu(trx.offsets[1]);
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part->size = le32_to_cpu(trx.len);
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part->size -= part->offset;
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part->offset += off;
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goto found;
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}
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}
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printk(KERN_NOTICE
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"%s: Couldn't find root filesystem\n",
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mtd->name);
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return -1;
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found:
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if (part->size == 0)
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return 0;
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if (mtd->read(mtd, part->offset, sizeof(buf), &len, buf) || len != sizeof(buf))
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return 0;
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/* Move the fs outside of the trx */
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part->size = 0;
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if (trx.len != part->offset + part->size - off) {
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/* Update the trx offsets and length */
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trx.len = part->offset + part->size - off;
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/* Update the trx crc32 */
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for (i = (u32) &(((struct trx_header *)NULL)->flag_version); i <= trx.len; i += sizeof(buf)) {
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if (mtd->read(mtd, off + i, sizeof(buf), &len, buf) || len != sizeof(buf))
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return 0;
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crc = crc32_le(crc, buf, min(sizeof(buf), trx.len - i));
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}
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trx.crc32 = crc;
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/* read first eraseblock from the trx */
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block = kmalloc(mtd->erasesize, GFP_KERNEL);
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trx2 = (struct trx_header *) block;
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if (mtd->read(mtd, off, mtd->erasesize, &len, block) || len != mtd->erasesize) {
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printk("Error accessing the first trx eraseblock\n");
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return 0;
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}
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printk("Updating TRX offsets and length:\n");
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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);
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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);
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/* Write updated trx header to the flash */
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memcpy(block, &trx, sizeof(trx));
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if (mtd->unlock)
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mtd->unlock(mtd, off, mtd->erasesize);
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erase_write(mtd, off, mtd->erasesize, block);
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if (mtd->sync)
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mtd->sync(mtd);
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kfree(block);
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printk("Done\n");
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}
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return part->size;
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}
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struct mtd_partition * __init
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init_mtd_partitions(struct mtd_info *mtd, size_t size)
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{
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int cfe_size;
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if ((cfe_size = find_cfe_size(mtd,size)) < 0)
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return NULL;
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/* boot loader */
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bcm947xx_parts[0].offset = 0;
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bcm947xx_parts[0].size = cfe_size;
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/* nvram */
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if (cfe_size != 384 * 1024) {
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bcm947xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize);
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bcm947xx_parts[3].size = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
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} else {
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/* nvram (old 128kb config partition on netgear wgt634u) */
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bcm947xx_parts[3].offset = bcm947xx_parts[0].size;
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bcm947xx_parts[3].size = ROUNDUP(NVRAM_SPACE, mtd->erasesize);
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}
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/* linux (kernel and rootfs) */
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if (cfe_size != 384 * 1024) {
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bcm947xx_parts[1].offset = bcm947xx_parts[0].size;
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bcm947xx_parts[1].size = bcm947xx_parts[3].offset -
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bcm947xx_parts[1].offset;
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} else {
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/* do not count the elf loader, which is on one block */
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bcm947xx_parts[1].offset = bcm947xx_parts[0].size +
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bcm947xx_parts[3].size + mtd->erasesize;
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bcm947xx_parts[1].size = size -
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bcm947xx_parts[0].size -
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(2*bcm947xx_parts[3].size) -
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mtd->erasesize;
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}
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/* find and size rootfs */
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find_root(mtd,size,&bcm947xx_parts[2]);
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bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset - bcm947xx_parts[3].size;
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return bcm947xx_parts;
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}
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#endif
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int __init init_bcm947xx_map(void)
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{
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#ifdef CONFIG_SSB
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struct ssb_mipscore *mcore = &ssb.mipscore;
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#endif
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size_t size;
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int ret = 0;
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#ifdef CONFIG_MTD_PARTITIONS
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struct mtd_partition *parts;
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int i;
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#endif
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#ifdef CONFIG_SSB
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u32 window = mcore->flash_window;
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u32 window_size = mcore->flash_window_size;
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printk("flash init: 0x%08x 0x%08x\n", window, window_size);
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bcm947xx_map.phys = window;
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bcm947xx_map.size = window_size;
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bcm947xx_map.virt = ioremap_nocache(window, window_size);
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#else
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printk("flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE);
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bcm947xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE);
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#endif
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if (!bcm947xx_map.virt) {
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printk("Failed to ioremap\n");
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return -EIO;
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}
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simple_map_init(&bcm947xx_map);
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if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
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printk("Failed to do_map_probe\n");
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iounmap((void *)bcm947xx_map.virt);
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return -ENXIO;
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}
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bcm947xx_mtd->owner = THIS_MODULE;
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size = bcm947xx_mtd->size;
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printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR);
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#ifdef CONFIG_MTD_PARTITIONS
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parts = init_mtd_partitions(bcm947xx_mtd, size);
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for (i = 0; parts[i].name; i++);
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ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
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if (ret) {
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printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
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goto fail;
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}
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#endif
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return 0;
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fail:
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if (bcm947xx_mtd)
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map_destroy(bcm947xx_mtd);
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if (bcm947xx_map.virt)
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iounmap((void *)bcm947xx_map.virt);
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bcm947xx_map.virt = 0;
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return ret;
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}
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void __exit cleanup_bcm947xx_map(void)
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{
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#ifdef CONFIG_MTD_PARTITIONS
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del_mtd_partitions(bcm947xx_mtd);
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#endif
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map_destroy(bcm947xx_mtd);
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iounmap((void *)bcm947xx_map.virt);
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}
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module_init(init_bcm947xx_map);
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module_exit(cleanup_bcm947xx_map);
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