/* * Copyright (C) 2006 Felix Fietkau * Copyright (C) 2005 Waldemar Brodkorb * 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 BCM963XX boards */ #include #include #include #include #include #include #include #ifdef CONFIG_MTD_PARTITIONS #include #endif #include #include #include #include #include extern int boot_loader_type; extern int parse_redboot_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long fis_origin); static struct mtd_partition *parsed_parts; #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 #define EXTENDED_SIZE 0xBFC00000 /* Extended flash address */ static struct mtd_info *bcm963xx_mtd; static struct map_info bcm963xx_map = { .name = "Physically mapped flash", .size = WINDOW_SIZE, .bankwidth = BUSWIDTH, .phys = WINDOW_ADDR, }; #ifdef CONFIG_MTD_PARTITIONS static struct mtd_partition bcm963xx_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: "OpenWrt", 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; if (*((__u32 *) buf) == SQUASHFS_MAGIC) { printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n", mtd->name, (u32) sb->bytes_used); /* Update the squashfs partition size based on the superblock info */ part->size = sb->bytes_used; len = part->offset + part->size; len += (mtd->erasesize - 1); len &= ~(mtd->erasesize - 1); part->size = len - part->offset; } else if (*((__u16 *) buf) == JFFS2_MAGIC_BITMASK) { printk(KERN_INFO "%s: Filesystem type: jffs2\n", mtd->name); /* Move the squashfs outside of the trx */ part->size = 0; } else { printk(KERN_INFO "%s: Filesystem type: unknown\n", mtd->name); return 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 */ bcm963xx_parts[0].offset = 0; bcm963xx_parts[0].size = cfe_size; /* nvram */ if (cfe_size != 384 * 1024) { bcm963xx_parts[3].offset = size - ROUNDUP(NVRAM_SPACE, mtd->erasesize); bcm963xx_parts[3].size = ROUNDUP(NVRAM_SPACE, mtd->erasesize); } else { /* nvram (old 128kb config partition on netgear wgt634u) */ bcm963xx_parts[3].offset = bcm963xx_parts[0].size; bcm963xx_parts[3].size = ROUNDUP(NVRAM_SPACE, mtd->erasesize); } /* linux (kernel and rootfs) */ if (cfe_size != 384 * 1024) { bcm963xx_parts[1].offset = bcm963xx_parts[0].size; bcm963xx_parts[1].size = bcm963xx_parts[3].offset - bcm963xx_parts[1].offset; } else { /* do not count the elf loader, which is on one block */ bcm963xx_parts[1].offset = bcm963xx_parts[0].size + bcm963xx_parts[3].size + mtd->erasesize; bcm963xx_parts[1].size = size - bcm963xx_parts[0].size - (2*bcm963xx_parts[3].size) - mtd->erasesize; } /* find and size rootfs */ if (find_root(mtd,size,&bcm963xx_parts[2])==0) { /* entirely jffs2 */ bcm963xx_parts[4].name = NULL; bcm963xx_parts[2].size = size - bcm963xx_parts[2].offset - bcm963xx_parts[3].size; } else { /* legacy setup */ /* calculate leftover flash, and assign it to the jffs2 partition */ if (cfe_size != 384 * 1024) { bcm963xx_parts[4].offset = bcm963xx_parts[2].offset + bcm963xx_parts[2].size; if ((bcm963xx_parts[4].offset % mtd->erasesize) > 0) { bcm963xx_parts[4].offset += mtd->erasesize - (bcm963xx_parts[4].offset % mtd->erasesize); } bcm963xx_parts[4].size = bcm963xx_parts[3].offset - bcm963xx_parts[4].offset; } else { bcm963xx_parts[4].offset = bcm963xx_parts[2].offset + bcm963xx_parts[2].size; if ((bcm963xx_parts[4].offset % mtd->erasesize) > 0) { bcm963xx_parts[4].offset += mtd->erasesize - (bcm963xx_parts[4].offset % mtd->erasesize); } bcm963xx_parts[4].size = size - bcm963xx_parts[3].size - bcm963xx_parts[4].offset; } } return bcm963xx_parts; } #endif int __init init_bcm963xx_map(void) { size_t size; int ret = 0; #ifdef CONFIG_MTD_PARTITIONS struct mtd_partition *parts; int i; #endif printk("BCM963xx flash init: 0x%08x 0x%08x\n", WINDOW_ADDR, WINDOW_SIZE); bcm963xx_map.virt = ioremap_nocache(WINDOW_ADDR, WINDOW_SIZE); if (!bcm963xx_map.virt) { printk("Failed to ioremap\n"); return -EIO; } simple_map_init(&bcm963xx_map); if (!(bcm963xx_mtd = do_map_probe("cfi_probe", &bcm963xx_map))) { printk("Failed to do_map_probe\n"); iounmap((void *)bcm963xx_map.virt); return -ENXIO; } bcm963xx_mtd->owner = THIS_MODULE; size = bcm963xx_mtd->size; printk(KERN_NOTICE "Flash device: 0x%x at 0x%x\n", size, WINDOW_ADDR); #ifdef CONFIG_MTD_PARTITIONS if (boot_loader_type == BOOT_LOADER_CFE) { parts = init_mtd_partitions(bcm963xx_mtd, size); for (i = 0; parts[i].name; i++); ret = add_mtd_partitions(bcm963xx_mtd, parts, i); if (ret) { printk(KERN_ERR "Flash: add_mtd_partitions failed\n"); goto fail; } } else { int parsed_nr_parts = 0; char * part_type; if (bcm963xx_mtd->size > 0x00400000) { printk("Support for extended flash memory size : 0x%08X ; ONLY 64MBIT SUPPORT\n", bcm963xx_mtd->size); bcm963xx_map.virt = (unsigned long)EXTENDED_SIZE; } #ifdef CONFIG_MTD_REDBOOT_PARTS if (parsed_nr_parts == 0) { int ret = parse_redboot_partitions(bcm963xx_mtd, &parsed_parts, 0); if (ret > 0) { part_type = "RedBoot"; parsed_nr_parts = ret; } } #endif add_mtd_partitions(bcm963xx_mtd, parsed_parts, parsed_nr_parts); #endif } return 0; fail: if (bcm963xx_mtd) map_destroy(bcm963xx_mtd); if (bcm963xx_map.virt) iounmap((void *)bcm963xx_map.virt); bcm963xx_map.virt = 0; return ret; } void __exit cleanup_bcm963xx_map(void) { #ifdef CONFIG_MTD_PARTITIONS del_mtd_partitions(bcm963xx_mtd); #endif map_destroy(bcm963xx_mtd); iounmap((void *)bcm963xx_map.virt); } module_init(init_bcm963xx_map); module_exit(cleanup_bcm963xx_map);