Florian Fainelli
18 years ago
parent
7f409744a4
commit
d8bf22859b
@ -0,0 +1,178 @@ |
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/*
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* Parse MyLoader-style flash partition tables and produce a Linux partition |
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* array to match. |
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* |
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* Copyright (C) 2007 OpenWrt.org |
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* Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu> |
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* |
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* This file was based on drivers/mtd/redboot.c |
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* Author: Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the |
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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* Boston, MA 02110-1301, USA. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/vmalloc.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/partitions.h> |
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#include <linux/byteorder/generic.h> |
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#include <asm/mach-adm5120/myloader.h> |
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#define NAME_LEN_MAX 20 |
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#define NAME_MYLOADER "MyLoader" |
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#define NAME_PARTITION_TABLE "Partition Table" |
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#define BLOCK_LEN_MIN 0x10000 |
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static int parse_myloader_partitions(struct mtd_info *master, |
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struct mtd_partition **pparts, |
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unsigned long origin) |
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{ |
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struct mylo_partition_table *tab; |
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struct mylo_partition *part; |
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struct mtd_partition *mtd_parts; |
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struct mtd_partition *mtd_part; |
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int num_parts; |
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int ret, i; |
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size_t retlen; |
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size_t parts_len; |
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char *names; |
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unsigned long offset; |
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unsigned long blocklen; |
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tab = vmalloc(sizeof(*tab)); |
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if (!tab) { |
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return -ENOMEM; |
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goto out; |
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} |
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blocklen = master->erasesize; |
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if (blocklen < BLOCK_LEN_MIN) |
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blocklen = BLOCK_LEN_MIN; |
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/* Partition Table is always located on the second erase block */ |
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offset = blocklen; |
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printk(KERN_NOTICE "Searching for MyLoader partition table " |
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"in %s at offset 0x%lx\n", master->name, offset); |
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ret = master->read(master, offset, sizeof(*tab), &retlen, |
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(void *)tab); |
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if (ret) |
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goto out; |
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if (retlen != sizeof(*tab)) { |
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ret = -EIO; |
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goto out_free_buf; |
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} |
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/* Check for Partition Table magic number */ |
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if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) { |
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printk(KERN_NOTICE "No MyLoader partition table detected " |
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"in %s\n", master->name); |
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ret = 0; |
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goto out_free_buf; |
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} |
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/* The MyLoader and the Partition Table is always present */ |
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num_parts = 2; |
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/* Detect number of used partitions */ |
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for (i = 0; i < MYLO_MAX_PARTITIONS; i++) { |
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part = &tab->partitions[i]; |
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if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE) |
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continue; |
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num_parts++; |
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} |
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mtd_parts = kzalloc((num_parts*sizeof(*mtd_part) + num_parts*NAME_LEN_MAX), |
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GFP_KERNEL); |
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if (!mtd_parts) { |
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ret = -ENOMEM; |
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goto out_free_buf; |
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} |
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mtd_part = mtd_parts; |
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names = (char *)&mtd_parts[num_parts]; |
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strcpy(NAME_MYLOADER, names); |
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mtd_part->name = names; |
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mtd_part->offset = 0; |
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mtd_part->size = blocklen; |
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mtd_part++; |
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names += NAME_LEN_MAX; |
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strcpy(NAME_PARTITION_TABLE, names); |
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mtd_part->name = names; |
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mtd_part->offset = blocklen; |
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mtd_part->size = blocklen; |
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mtd_part++; |
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names += NAME_LEN_MAX; |
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for (i = 0; i < MYLO_MAX_PARTITIONS; i++) { |
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part = &tab->partitions[i]; |
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if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE) |
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continue; |
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sprintf(names, "partition%d", i); |
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mtd_part->name = names; |
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mtd_part->offset = le32_to_cpu(part->addr); |
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mtd_part->size = le32_to_cpu(part->size); |
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mtd_part++; |
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names += NAME_LEN_MAX; |
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} |
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*pparts = mtd_parts; |
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ret = num_parts; |
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out_free_buf: |
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vfree(tab); |
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out: |
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return ret; |
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} |
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static struct mtd_part_parser mylo_mtd_parser = { |
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.owner = THIS_MODULE, |
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.parse_fn = parse_myloader_partitions, |
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.name = NAME_MYLOADER, |
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}; |
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static int __init mylo_mtd_parser_init(void) |
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{ |
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return register_mtd_parser(&mylo_mtd_parser); |
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} |
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static void __exit mylo_mtd_parser_exit(void) |
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{ |
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deregister_mtd_parser(&mylo_mtd_parser); |
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} |
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module_init(mylo_mtd_parser_init); |
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module_exit(mylo_mtd_parser_exit); |
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EXPORT_SYMBOL_GPL(parse_myloader_partitions); |
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MODULE_AUTHOR("Gabor Juhos <juhosg@freemail.hu>"); |
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MODULE_DESCRIPTION("Parsing code for MyLoader partition tables"); |
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MODULE_LICENSE("GPL"); |
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@ -0,0 +1,37 @@ |
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diff -Nur linux-2.6.19.2/drivers/mtd/Kconfig.old linux-2.6.19.2/drivers/mtd/Kconfig
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--- linux-2.6.19.2/drivers/mtd/Kconfig.old 2007-03-25 08:13:02.000000000 +0200
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+++ linux-2.6.19.2/drivers/mtd/Kconfig 2007-03-26 13:37:47.000000000 +0200
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@@ -157,6 +157,22 @@
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for your particular device. It won't happen automatically. The
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'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example.
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+config MTD_MYLOADER_PARTS
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+ tristate "MyLoader partition parsing"
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+ depends on MIPS_ADM5120 && MTD_PARTITIONS
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+ ---help---
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+ MyLoader is a bootloader which allows the user to define partitions
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+ in flash devices, by putting a table in the second erase block
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+ on the device, similar to a partition table. This table gives the
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+ offsets and lengths of the user defined partitions.
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+
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+ If you need code which can detect and parse these tables, and
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+ register MTD 'partitions' corresponding to each image detected,
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+ enable this option.
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+
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+ You will still need the parsing functions to be called by the driver
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+ for your particular device. It won't happen automatically.
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+
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comment "User Modules And Translation Layers"
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depends on MTD
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diff -Nur linux-2.6.19.2/drivers/mtd/Makefile.old linux-2.6.19.2/drivers/mtd/Makefile
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--- linux-2.6.19.2/drivers/mtd/Makefile.old 2007-01-10 20:10:37.000000000 +0100
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+++ linux-2.6.19.2/drivers/mtd/Makefile 2007-03-26 13:28:23.000000000 +0200
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@@ -12,6 +12,7 @@
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obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o
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obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o
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obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
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+obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
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# 'Users' - code which presents functionality to userspace.
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obj-$(CONFIG_MTD_CHAR) += mtdchar.o
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