Add myloader partition table parser

SVN-Revision: 6736

target/linux/adm5120-2.6/files/drivers/mtd/myloader.c

@@ -0,0 +1,178 @@
+/*
+ *  Parse MyLoader-style flash partition tables and produce a Linux partition
+ *  array to match.
+ *
+ *  Copyright (C) 2007 OpenWrt.org
+ *  Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
+ *
+ *  This file was based on drivers/mtd/redboot.c
+ *  Author: Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ *  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 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.
+ *
+ *  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 Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/vmalloc.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include <linux/byteorder/generic.h>
+#include <asm/mach-adm5120/myloader.h>
+
+#define NAME_LEN_MAX		20
+#define NAME_MYLOADER		"MyLoader"
+#define NAME_PARTITION_TABLE	"Partition Table"
+#define BLOCK_LEN_MIN		0x10000
+
+static int parse_myloader_partitions(struct mtd_info *master,
+			struct mtd_partition **pparts,
+			unsigned long origin)
+{
+	struct mylo_partition_table *tab;
+	struct mylo_partition *part;
+	struct mtd_partition *mtd_parts;
+	struct mtd_partition *mtd_part;
+	int num_parts;
+	int ret, i;
+	size_t retlen;
+	size_t parts_len;
+	char *names;
+	unsigned long offset;
+	unsigned long blocklen;
+
+	tab = vmalloc(sizeof(*tab));
+	if (!tab) {
+		return -ENOMEM;
+		goto out;
+	}
+
+	blocklen = master->erasesize;
+	if (blocklen < BLOCK_LEN_MIN)
+		blocklen = BLOCK_LEN_MIN;
+
+	/* Partition Table is always located on the second erase block */
+	offset = blocklen;
+	printk(KERN_NOTICE "Searching for MyLoader partition table "
+			"in %s at offset 0x%lx\n", master->name, offset);
+
+	ret = master->read(master, offset, sizeof(*tab), &retlen,
+			(void *)tab);
+
+	if (ret)
+		goto out;
+
+	if (retlen != sizeof(*tab)) {
+		ret = -EIO;
+		goto out_free_buf;
+	}
+
+	/* Check for Partition Table magic number */
+	if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
+		printk(KERN_NOTICE "No MyLoader partition table detected "
+			"in %s\n", master->name);
+		ret = 0;
+		goto out_free_buf;
+	}
+
+	/* The MyLoader and the Partition Table is always present */
+	num_parts = 2;
+
+	/* Detect number of used partitions */
+	for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
+		part = &tab->partitions[i];
+
+		if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
+			continue;
+
+		num_parts++;
+	}
+
+
+	mtd_parts = kzalloc((num_parts*sizeof(*mtd_part) + num_parts*NAME_LEN_MAX),
+			 GFP_KERNEL);
+
+	if (!mtd_parts) {
+		ret = -ENOMEM;
+		goto out_free_buf;
+	}
+
+	mtd_part = mtd_parts;
+	names = (char *)&mtd_parts[num_parts];
+
+	strcpy(NAME_MYLOADER, names);
+	mtd_part->name = names;
+	mtd_part->offset = 0;
+	mtd_part->size = blocklen;
+	mtd_part++;
+	names += NAME_LEN_MAX;
+
+	strcpy(NAME_PARTITION_TABLE, names);
+	mtd_part->name = names;
+	mtd_part->offset = blocklen;
+	mtd_part->size = blocklen;
+	mtd_part++;
+	names += NAME_LEN_MAX;
+
+	for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
+		part = &tab->partitions[i];
+
+		if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
+			continue;
+
+		sprintf(names, "partition%d", i);
+		mtd_part->name = names;
+		mtd_part->offset = le32_to_cpu(part->addr);
+		mtd_part->size = le32_to_cpu(part->size);
+		mtd_part++;
+		names += NAME_LEN_MAX;
+	}
+
+	*pparts = mtd_parts;
+	ret = num_parts;
+
+out_free_buf:
+	vfree(tab);
+out:
+	return ret;
+}
+
+static struct mtd_part_parser mylo_mtd_parser = {
+	.owner = THIS_MODULE,
+	.parse_fn = parse_myloader_partitions,
+	.name = NAME_MYLOADER,
+};
+
+static int __init mylo_mtd_parser_init(void)
+{
+	return register_mtd_parser(&mylo_mtd_parser);
+}
+
+static void __exit mylo_mtd_parser_exit(void)
+{
+	deregister_mtd_parser(&mylo_mtd_parser);
+}
+
+module_init(mylo_mtd_parser_init);
+module_exit(mylo_mtd_parser_exit);
+
+EXPORT_SYMBOL_GPL(parse_myloader_partitions);
+
+MODULE_AUTHOR("Gabor Juhos <juhosg@freemail.hu>");
+MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");
+MODULE_LICENSE("GPL");