--- /dev/null
+/*
+ * 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");
--- /dev/null
+diff -Nur linux-2.6.19.2/drivers/mtd/Kconfig.old linux-2.6.19.2/drivers/mtd/Kconfig
+--- linux-2.6.19.2/drivers/mtd/Kconfig.old 2007-03-25 08:13:02.000000000 +0200
++++ linux-2.6.19.2/drivers/mtd/Kconfig 2007-03-26 13:37:47.000000000 +0200
+@@ -157,6 +157,22 @@
+ for your particular device. It won't happen automatically. The
+ 'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example.
+
++config MTD_MYLOADER_PARTS
++ tristate "MyLoader partition parsing"
++ depends on MIPS_ADM5120 && MTD_PARTITIONS
++ ---help---
++ MyLoader is a bootloader which allows the user to define partitions
++ in flash devices, by putting a table in the second erase block
++ on the device, similar to a partition table. This table gives the
++ offsets and lengths of the user defined partitions.
++
++ If you need code which can detect and parse these tables, and
++ register MTD 'partitions' corresponding to each image detected,
++ enable this option.
++
++ You will still need the parsing functions to be called by the driver
++ for your particular device. It won't happen automatically.
++
+ comment "User Modules And Translation Layers"
+ depends on MTD
+
+diff -Nur linux-2.6.19.2/drivers/mtd/Makefile.old linux-2.6.19.2/drivers/mtd/Makefile
+--- linux-2.6.19.2/drivers/mtd/Makefile.old 2007-01-10 20:10:37.000000000 +0100
++++ linux-2.6.19.2/drivers/mtd/Makefile 2007-03-26 13:28:23.000000000 +0200
+@@ -12,6 +12,7 @@
+ obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o
+ obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o
+ obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
++obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
+
+ # 'Users' - code which presents functionality to userspace.
+ obj-$(CONFIG_MTD_CHAR) += mtdchar.o
projects / openwrt.git / commitdiff