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Diffstat (limited to 'target/linux/easygate-2.6/files/drivers/mtd/maps/bcm963xx-flash.c')
-rw-r--r--target/linux/easygate-2.6/files/drivers/mtd/maps/bcm963xx-flash.c467
1 files changed, 467 insertions, 0 deletions
diff --git a/target/linux/easygate-2.6/files/drivers/mtd/maps/bcm963xx-flash.c b/target/linux/easygate-2.6/files/drivers/mtd/maps/bcm963xx-flash.c
new file mode 100644
index 000000000..3424749a5
--- /dev/null
+++ b/target/linux/easygate-2.6/files/drivers/mtd/maps/bcm963xx-flash.c
@@ -0,0 +1,467 @@
+/*
+ * 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 BCM963XX boards
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.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/squashfs_fs.h>
+#include <linux/jffs2.h>
+#include <linux/crc32.h>
+#include <asm/io.h>
+
+#include <asm/mach-bcm963xx/bootloaders.h>
+
+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 0x1f000000
+#define WINDOW_SIZE 0x800000
+#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;
+ struct mtd_partition *parts;
+ int i;
+
+ 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("jedec_probe", &bcm963xx_map))) {
+ printk("Failed to jedec_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);
+
+ if (boot_loader_type == BOOT_LOADER_REDBOOT) {
+ 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;
+ }
+
+ 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;
+ }
+ }
+ add_mtd_partitions(bcm963xx_mtd, parsed_parts, parsed_nr_parts);
+ }
+ else {
+ 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;
+ }
+ }
+ 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)
+{
+ del_mtd_partitions(bcm963xx_mtd);
+ map_destroy(bcm963xx_mtd);
+ iounmap((void *)bcm963xx_map.virt);
+}
+
+module_init(init_bcm963xx_map);
+module_exit(cleanup_bcm963xx_map);
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