diff options
Diffstat (limited to 'target/linux/adm5120-2.6/files/drivers')
| -rw-r--r-- | target/linux/adm5120-2.6/files/drivers/mtd/myloader.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/target/linux/adm5120-2.6/files/drivers/mtd/myloader.c b/target/linux/adm5120-2.6/files/drivers/mtd/myloader.c new file mode 100644 index 0000000..1bdd798 --- /dev/null +++ b/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"); |