548 lines
14 KiB
C
548 lines
14 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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*
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* Copyright 2004, 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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*/
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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/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/config.h>
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#include <linux/squashfs_fs.h>
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#include <linux/jffs2.h>
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#include <linux/crc32.h>
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#include <asm/io.h>
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#include <typedefs.h>
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#include <osl.h>
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#include <bcmnvram.h>
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#include <bcmutils.h>
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#include <sbconfig.h>
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#include <sbchipc.h>
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#include <sbutils.h>
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#include <trxhdr.h>
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/* Global SB handle */
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extern void *bcm947xx_sbh;
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extern spinlock_t bcm947xx_sbh_lock;
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/* Convenience */
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#define sbh bcm947xx_sbh
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#define sbh_lock bcm947xx_sbh_lock
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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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static struct mtd_info *bcm947xx_mtd;
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__u8 bcm947xx_map_read8(struct map_info *map, unsigned long ofs)
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{
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if (map->map_priv_2 == 1)
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return __raw_readb(map->map_priv_1 + ofs);
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u16 val = __raw_readw(map->map_priv_1 + (ofs & ~1));
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if (ofs & 1)
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return ((val >> 8) & 0xff);
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else
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return (val & 0xff);
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}
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__u16 bcm947xx_map_read16(struct map_info *map, unsigned long ofs)
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{
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return __raw_readw(map->map_priv_1 + ofs);
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}
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__u32 bcm947xx_map_read32(struct map_info *map, unsigned long ofs)
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{
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return __raw_readl(map->map_priv_1 + ofs);
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}
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void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
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{
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if (len==1) {
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memcpy_fromio(to, map->map_priv_1 + from, len);
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} else {
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int i;
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u16 *dest = (u16 *) to;
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u16 *src = (u16 *) (map->map_priv_1 + from);
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for (i = 0; i < (len / 2); i++) {
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dest[i] = src[i];
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}
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if (len & 1)
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*((u8 *)dest+len-1) = src[i] & 0xff;
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}
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}
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void bcm947xx_map_write8(struct map_info *map, __u8 d, unsigned long adr)
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{
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__raw_writeb(d, map->map_priv_1 + adr);
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mb();
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}
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void bcm947xx_map_write16(struct map_info *map, __u16 d, unsigned long adr)
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{
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__raw_writew(d, map->map_priv_1 + adr);
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mb();
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}
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void bcm947xx_map_write32(struct map_info *map, __u32 d, unsigned long adr)
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{
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__raw_writel(d, map->map_priv_1 + adr);
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mb();
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}
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void bcm947xx_map_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
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{
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memcpy_toio(map->map_priv_1 + to, from, len);
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}
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struct map_info bcm947xx_map = {
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name: "Physically mapped flash",
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size: WINDOW_SIZE,
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buswidth: BUSWIDTH,
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read8: bcm947xx_map_read8,
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read16: bcm947xx_map_read16,
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read32: bcm947xx_map_read32,
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copy_from: bcm947xx_map_copy_from,
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write8: bcm947xx_map_write8,
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write16: bcm947xx_map_write16,
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write32: bcm947xx_map_write32,
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copy_to: bcm947xx_map_copy_to
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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: "rootfs_data", 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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if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
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printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used);
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/* Update the squashfs partition size based on the superblock info */
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part->size = sb->bytes_used;
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len = part->offset + part->size;
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len += (mtd->erasesize - 1);
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len &= ~(mtd->erasesize - 1);
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part->size = len - part->offset;
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} else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) {
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printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name);
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/* Move the squashfs outside of the trx */
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part->size = 0;
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} else {
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printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name);
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return 0;
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}
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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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trx2 = block = kmalloc(mtd->erasesize, GFP_KERNEL);
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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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if (find_root(mtd,size,&bcm947xx_parts[2])==0) {
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/* entirely jffs2 */
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bcm947xx_parts[4].name = NULL;
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bcm947xx_parts[2].size = size - bcm947xx_parts[2].offset -
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bcm947xx_parts[3].size;
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} else {
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/* legacy setup */
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/* calculate leftover flash, and assign it to the jffs2 partition */
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if (cfe_size != 384 * 1024) {
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bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
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bcm947xx_parts[2].size;
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if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
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bcm947xx_parts[4].offset += mtd->erasesize -
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(bcm947xx_parts[4].offset % mtd->erasesize);
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}
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bcm947xx_parts[4].size = bcm947xx_parts[3].offset -
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bcm947xx_parts[4].offset;
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} else {
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bcm947xx_parts[4].offset = bcm947xx_parts[2].offset +
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bcm947xx_parts[2].size;
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if ((bcm947xx_parts[4].offset % mtd->erasesize) > 0) {
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bcm947xx_parts[4].offset += mtd->erasesize -
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(bcm947xx_parts[4].offset % mtd->erasesize);
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}
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bcm947xx_parts[4].size = size - bcm947xx_parts[3].size -
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bcm947xx_parts[4].offset;
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}
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}
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return bcm947xx_parts;
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}
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#endif
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mod_init_t init_bcm947xx_map(void)
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{
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ulong flags;
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uint coreidx;
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chipcregs_t *cc;
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uint32 fltype;
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uint window_addr = 0, window_size = 0;
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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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spin_lock_irqsave(&sbh_lock, flags);
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coreidx = sb_coreidx(sbh);
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/* Check strapping option if chipcommon exists */
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if ((cc = sb_setcore(sbh, SB_CC, 0))) {
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fltype = readl(&cc->capabilities) & CAP_FLASH_MASK;
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if (fltype == PFLASH) {
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bcm947xx_map.map_priv_2 = 1;
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window_addr = 0x1c000000;
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bcm947xx_map.size = window_size = 32 * 1024 * 1024;
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if ((readl(&cc->flash_config) & CC_CFG_DS) == 0)
|
|
bcm947xx_map.buswidth = 1;
|
|
}
|
|
} else {
|
|
fltype = PFLASH;
|
|
bcm947xx_map.map_priv_2 = 0;
|
|
window_addr = WINDOW_ADDR;
|
|
window_size = WINDOW_SIZE;
|
|
}
|
|
|
|
sb_setcoreidx(sbh, coreidx);
|
|
spin_unlock_irqrestore(&sbh_lock, flags);
|
|
|
|
if (fltype != PFLASH) {
|
|
printk(KERN_ERR "pflash: found no supported devices\n");
|
|
ret = -ENODEV;
|
|
goto fail;
|
|
}
|
|
|
|
bcm947xx_map.map_priv_1 = (unsigned long) ioremap(window_addr, window_size);
|
|
|
|
if (!bcm947xx_map.map_priv_1) {
|
|
printk(KERN_ERR "Failed to ioremap\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
|
|
printk(KERN_ERR "pflash: cfi_probe failed\n");
|
|
iounmap((void *)bcm947xx_map.map_priv_1);
|
|
return -ENXIO;
|
|
}
|
|
|
|
bcm947xx_mtd->module = THIS_MODULE;
|
|
|
|
size = bcm947xx_mtd->size;
|
|
|
|
printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, window_addr);
|
|
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
parts = init_mtd_partitions(bcm947xx_mtd, size);
|
|
for (i = 0; parts[i].name; i++);
|
|
ret = add_mtd_partitions(bcm947xx_mtd, parts, i);
|
|
if (ret) {
|
|
printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
|
|
goto fail;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
if (bcm947xx_mtd)
|
|
map_destroy(bcm947xx_mtd);
|
|
if (bcm947xx_map.map_priv_1)
|
|
iounmap((void *) bcm947xx_map.map_priv_1);
|
|
bcm947xx_map.map_priv_1 = 0;
|
|
return ret;
|
|
}
|
|
|
|
mod_exit_t cleanup_bcm947xx_map(void)
|
|
{
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
del_mtd_partitions(bcm947xx_mtd);
|
|
#endif
|
|
map_destroy(bcm947xx_mtd);
|
|
iounmap((void *) bcm947xx_map.map_priv_1);
|
|
bcm947xx_map.map_priv_1 = 0;
|
|
}
|
|
|
|
module_init(init_bcm947xx_map);
|
|
module_exit(cleanup_bcm947xx_map);
|