[adm8668] fix firstboot with new MTD map driver

my-mkimage previously did not include the fs_mark of deadc0de because
upon formatting of jffs2 partition, U-Boot's CRC validation would not
allow the image to boot. This new MTD map will shrink the
kernel+rootfs+fs_mark image and recalculate the CRC, so that only the
kernel is part of the image validation. This also improves boot time,
since less is copied from FLASH->RAM. This is mostly from brcm47xx,
just with u-boot image vs TRX partitions.

Signed-off-by: Scott Nicholas <scott.nicholas@scottn.us>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25176 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 285 insertions, 69 deletions

diff --git a/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c b/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c
index 903decc7b1..8d0ab690f2 100644
--- a/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c
+++ b/target/linux/adm8668/files/drivers/mtd/maps/adm8668.c
@@ -1,125 +1,341 @@
 /*
- * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
+ *  Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
+ *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
+ *  Copyright (C) 2004 Florian Schirmer (jolt@tuxbox.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.
+ *  original functions for finding root filesystem from Mike Baker
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ *  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 2004, 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 adm8668 boards
  *
- * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
-#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/map.h>
+#include <linux/slab.h>
+#ifdef CONFIG_MTD_PARTITIONS
 #include <linux/mtd/partitions.h>
+#endif
+#include <linux/crc32.h>
 #include <linux/magic.h>
 #include <asm/io.h>
 
-#define	FLASH_SIZE	0x800000
-#define	FLASH_PHYS_ADDR	0x10000000
+#define WINDOW_ADDR	0x10000000
+#define WINDOW_SIZE	0x800000
+#define BANKWIDTH	2
+
+/* first a little bit about the headers i need.. */
 
 /* just interested in part of the full struct */
 struct squashfs_super_block {
-	__le32	s_magic;
-	__le32	pad0[9];	/* it's not really padding */
-	__le64	bytes_used;
+        __le32  s_magic;
+        __le32  pad0[9];        /* it's not really padding */
+        __le64  bytes_used;
 };
 
-static struct mtd_info *mymtd;
+#define IH_MAGIC	0x56190527	/* Image Magic Number		*/
+struct uboot_header {
+	uint32_t	ih_magic;	/* Image Header Magic Number	*/
+	uint32_t	ih_hcrc;	/* Image Header CRC Checksum	*/
+	uint32_t	ih_time;	/* Image Creation Timestamp	*/
+	uint32_t	ih_size;	/* Image Data Size		*/
+	uint32_t	ih_load;	/* Data	 Load  Address		*/
+	uint32_t	ih_ep;		/* Entry Point Address		*/
+	uint32_t	ih_dcrc;	/* Image Data CRC Checksum	*/
+	uint8_t		ih_os;		/* Operating System		*/
+	uint8_t		ih_arch;	/* CPU architecture		*/
+	uint8_t		ih_type;	/* Image Type			*/
+	uint8_t		ih_comp;	/* Compression Type		*/
+	char		ih_name[32];	/* image name */
+};
 
-static struct map_info nor_map = {
-	name:		"adm8668-nor",
-	size:		FLASH_SIZE,
-	phys:		FLASH_PHYS_ADDR,
-	bankwidth:	2,
+/************************************************/
+
+static struct mtd_info *adm8668_mtd;
+
+struct map_info adm8668_map = {
+	name: "adm8668-nor",
+	size: WINDOW_SIZE,
+	phys: WINDOW_ADDR,
+	bankwidth: BANKWIDTH,
 };
 
-static struct mtd_partition nor_parts[] = {
-	{ name: "linux",  offset: 0x40000,  size: FLASH_SIZE - 0x40000, },
-	{ name: "rootfs", offset: 0x200000, size: 0x400000, },
+#ifdef CONFIG_MTD_PARTITIONS
+
+/*
+ * 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, write data to flash.
+	 */
+
+	ret = mtd->write (mtd, pos, len, &retlen, buf);
+	if (ret)
+		return ret;
+	if (retlen != len)
+		return -EIO;
+	return 0;
+}
+
+/* decent defaults in case... shrug */
+static struct mtd_partition adm8668_parts[] = {
+	{ name: "linux",	offset: 0x40000,	size: WINDOW_SIZE-0x40000, },
+	{ name: "rootfs",	offset: 0xe0000,	size: 0x140000, },
+	{ name: "uboot_env",	offset: 0x20000,	size: 0x20000, },
 	{ name: NULL, },
 };
 
-int __init init_mtd_partitions(struct mtd_info *mtd, size_t size)
+/* in case i wanna change stuff later, and to clarify the math section... */
+#define	PART_LINUX	0
+#define	PART_ROOTFS	1
+#define	NR_PARTS	3
+
+static int __init
+init_mtd_partitions(struct mtd_info *mtd, size_t size)
 {
-	int blocksize, off;
-	size_t len;
-	struct squashfs_super_block hdr;
+	struct uboot_header uhdr;
+	int off, blocksize;
+	size_t len, linux_len;
+	struct squashfs_super_block shdr;
 
 	blocksize = mtd->erasesize;
 	if (blocksize < 0x10000)
 		blocksize = 0x10000;
 
-	memset(&hdr, 0xe5, sizeof(hdr));
-	/* find and size squashfs */
-	for (off = (128*1024); off < size; off += blocksize) {
-		if (mtd->read(mtd, off, sizeof(hdr), &len, (char *)&hdr) ||
-		    len != sizeof(hdr))
+	/* now find squashfs */
+	memset(&shdr, 0xe5, sizeof(shdr));
+	for (off = adm8668_parts[PART_LINUX].offset; off < size; off += blocksize) {
+		/*
+		 * Read into buffer
+		 */
+		if (mtd->read(mtd, off, sizeof(shdr), &len, (char *)&shdr) ||
+		    len != sizeof(shdr))
 			continue;
 
-		if (hdr.s_magic == SQUASHFS_MAGIC) {
-			printk(KERN_INFO "%s: Filesystem type: squashfs, off=%#x size=%#x\n",
-				mtd->name, off, (unsigned int)hdr.bytes_used);
-			/* Update the squashfs start address only! */
-			nor_parts[1].offset = off;
-			nor_parts[1].size = FLASH_SIZE - off;
-			return 2;
+		if (shdr.s_magic == SQUASHFS_MAGIC) {
+			uint32_t fs_size = (uint32_t)shdr.bytes_used;
+
+			printk(KERN_INFO "%s: Filesystem type: squashfs, size=%dkB\n",
+				mtd->name, fs_size>>10);
+
+			/* Update rootfs based on the superblock info, and
+			 * stretch to end of MTD. rootfs_split will split it */
+			adm8668_parts[PART_ROOTFS].offset = off;
+			adm8668_parts[PART_ROOTFS].size = mtd->size -
+				adm8668_parts[PART_ROOTFS].offset;
+
+			/* kernel ends where rootfs starts
+			 * but we'll keep it full-length for upgrades */
+			linux_len = adm8668_parts[PART_LINUX+1].offset -
+				adm8668_parts[PART_LINUX].offset;
+#if 1
+			adm8668_parts[PART_LINUX].size = mtd->size -
+				adm8668_parts[PART_LINUX].offset;
+#else
+			adm8668_parts[PART_LINUX].size = linux_len;
+#endif
+			goto found;
+		}
+	}
+
+	printk(KERN_NOTICE
+	       "%s: Couldn't find root filesystem\n",
+	       mtd->name);
+	return NR_PARTS;
+
+ found:
+	if (mtd->read(mtd, adm8668_parts[PART_LINUX].offset, sizeof(uhdr), &len, (char *)&uhdr) ||
+	    len != sizeof(uhdr))
+		return NR_PARTS;
+
+	/* that's odd. how'd ya boot it then */
+	if (uhdr.ih_magic != IH_MAGIC)
+		return NR_PARTS;
+
+	if (be32_to_cpu(uhdr.ih_size) != (linux_len - sizeof(uhdr))) {
+		unsigned char *block, *data = (unsigned char *)(WINDOW_ADDR | (adm8668_parts[PART_LINUX].offset + sizeof(struct uboot_header)) | 0xA0000000);
+
+		printk(KERN_NOTICE "Updating U-boot image:\n");
+		printk(KERN_NOTICE "  old: [size: %8d crc32: 0x%08x]\n",
+			be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
+
+		/* Update the data length & crc32 */
+		uhdr.ih_size = cpu_to_be32(linux_len - sizeof(uhdr));
+		uhdr.ih_dcrc = crc32_le(~0, data, linux_len - sizeof(uhdr)) ^ (~0);
+		uhdr.ih_dcrc = cpu_to_be32(uhdr.ih_dcrc);
+
+		printk(KERN_NOTICE "  new: [size: %8d crc32: 0x%08x]\n",
+			be32_to_cpu(uhdr.ih_size), be32_to_cpu(uhdr.ih_dcrc));
+
+		/* update header's crc... */
+		uhdr.ih_hcrc = 0;
+		uhdr.ih_hcrc = crc32_le(~0, (unsigned char *)&uhdr,
+				sizeof(uhdr)) ^ (~0);
+		uhdr.ih_hcrc = cpu_to_be32(uhdr.ih_hcrc);
+
+		/* read first eraseblock from the image */
+		block = kmalloc(mtd->erasesize, GFP_KERNEL);
+		if (mtd->read(mtd, adm8668_parts[PART_LINUX].offset, mtd->erasesize, &len, block) || len != mtd->erasesize) {
+			printk("Error copying first eraseblock\n");
+			return 0;
 		}
+
+		/* Write updated header to the flash */
+		memcpy(block, &uhdr, sizeof(uhdr));
+		if (mtd->unlock)
+			mtd->unlock(mtd, off, mtd->erasesize);
+		erase_write(mtd, adm8668_parts[PART_LINUX].offset, mtd->erasesize, block);
+		if (mtd->sync)
+			mtd->sync(mtd);
+		kfree(block);
+		printk(KERN_NOTICE "Done\n");
 	}
-	return 2;
+
+	return NR_PARTS;
 }
 
-int __init init_nor(void)
+#endif
+
+
+int __init init_adm8668_map(void)
 {
-	int nr_parts;
+#ifdef CONFIG_MTD_PARTITIONS
+	int nr_parts, ret;
+#endif
 
-	printk(KERN_NOTICE "ADM8668 NOR flash device: %#x at %#x\n",
-			FLASH_SIZE, FLASH_PHYS_ADDR);
+	adm8668_map.virt = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
 
-	nor_map.virt = ioremap(FLASH_PHYS_ADDR,	FLASH_SIZE);
-	if (!nor_map.virt) {
-		printk("Failed to ioremap\n");
+	if (!adm8668_map.virt) {
+		printk(KERN_ERR "Failed to ioremap\n");
 		return -EIO;
 	}
 
-	simple_map_init(&nor_map);
-	mymtd = do_map_probe("cfi_probe", &nor_map);
-	if (!mymtd) {
-		iounmap((void *)nor_map.virt);
+	simple_map_init(&adm8668_map);
+	if (!(adm8668_mtd = do_map_probe("cfi_probe", &adm8668_map))) {
+		printk(KERN_ERR "cfi_probe failed\n");
+		iounmap((void *)adm8668_map.virt);
 		return -ENXIO;
 	}
-	mymtd->owner = THIS_MODULE;
-	nr_parts = init_mtd_partitions(mymtd, mymtd->size);
-	add_mtd_partitions(mymtd, nor_parts, nr_parts);
+
+	adm8668_mtd->owner = THIS_MODULE;
+
+#ifdef CONFIG_MTD_PARTITIONS
+	nr_parts = init_mtd_partitions(adm8668_mtd, adm8668_mtd->size);
+	ret = add_mtd_partitions(adm8668_mtd, adm8668_parts, nr_parts);
+	if (ret) {
+		printk(KERN_ERR "Flash: add_mtd_partitions failed\n");
+		goto fail;
+	}
+#endif
 
 	return 0;
+
+ fail:
+	if (adm8668_mtd)
+		map_destroy(adm8668_mtd);
+	if (adm8668_map.virt)
+		iounmap((void *) adm8668_map.virt);
+	adm8668_map.virt = 0;
+	return ret;
 }
 
-static void __exit cleanup_nor(void)
+void __exit cleanup_adm8668_map(void)
 {
-	if (mymtd) {
-		del_mtd_partitions(mymtd);
-		map_destroy(mymtd);
-	}
-	if (nor_map.virt) {
-		iounmap((void *)nor_map.virt);
-		nor_map.virt = 0;
-	}
+#ifdef CONFIG_MTD_PARTITIONS
+	del_mtd_partitions(adm8668_mtd);
+#endif
+	map_destroy(adm8668_mtd);
+	iounmap((void *) adm8668_map.virt);
+	adm8668_map.virt = 0;
 }
 
-module_init(init_nor);
-module_exit(cleanup_nor);
+module_init(init_adm8668_map);
+module_exit(cleanup_adm8668_map);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Scott Nicholas <neutronscott@scottn.us>");