Release 4.14 drivers/mtd/ar7part.c

/*
 * Copyright © 2007 Eugene Konev <ejka@openwrt.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.
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * TI AR7 flash partition table.
 * Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
 *
 */

#include <linux/kernel.h>
#include <linux/slab.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/bootmem.h>
#include <linux/module.h>

#include <uapi/linux/magic.h>


#define AR7_PARTS	4

#define ROOT_OFFSET	0xe0000


#define LOADER_MAGIC1	le32_to_cpu(0xfeedfa42)

#define LOADER_MAGIC2	le32_to_cpu(0xfeed1281)


struct ar7_bin_rec {
	
unsigned int checksum;
	
unsigned int length;
	
unsigned int address;
};



static int create_mtd_partitions(struct mtd_info *master,
				 const struct mtd_partition **pparts,
				 struct mtd_part_parser_data *data)
{
	struct ar7_bin_rec header;
	unsigned int offset;
	size_t len;
	unsigned int pre_size = master->erasesize, post_size = 0;
	unsigned int root_offset = ROOT_OFFSET;

	int retries = 10;
	struct mtd_partition *ar7_parts;

	ar7_parts = kzalloc(sizeof(*ar7_parts) * AR7_PARTS, GFP_KERNEL);
	if (!ar7_parts)
		return -ENOMEM;
	ar7_parts[0].name = "loader";
	ar7_parts[0].offset = 0;
	ar7_parts[0].size = master->erasesize;
	ar7_parts[0].mask_flags = MTD_WRITEABLE;

	ar7_parts[1].name = "config";
	ar7_parts[1].offset = 0;
	ar7_parts[1].size = master->erasesize;
	ar7_parts[1].mask_flags = 0;

	do { /* Try 10 blocks starting from master->erasesize */
		offset = pre_size;
		mtd_read(master, offset, sizeof(header), &len,
			 (uint8_t *)&header);
		if (!strncmp((char *)&header, "TIENV0.8", 8))
			ar7_parts[1].offset = pre_size;
		if (header.checksum == LOADER_MAGIC1)
			break;
		if (header.checksum == LOADER_MAGIC2)
			break;
		pre_size += master->erasesize;
	} while (retries--);

	pre_size = offset;

	if (!ar7_parts[1].offset) {
		ar7_parts[1].offset = master->size - master->erasesize;
		post_size = master->erasesize;
	}

	switch (header.checksum) {
	case LOADER_MAGIC1:
		while (header.length) {
			offset += sizeof(header) + header.length;
			mtd_read(master, offset, sizeof(header), &len,
				 (uint8_t *)&header);
		}
		root_offset = offset + sizeof(header) + 4;
		break;
	case LOADER_MAGIC2:
		while (header.length) {
			offset += sizeof(header) + header.length;
			mtd_read(master, offset, sizeof(header), &len,
				 (uint8_t *)&header);
		}
		root_offset = offset + sizeof(header) + 4 + 0xff;
		root_offset &= ~(uint32_t)0xff;
		break;
	default:
		printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum);
		break;
	}

	mtd_read(master, root_offset, sizeof(header), &len, (u8 *)&header);
	if (header.checksum != SQUASHFS_MAGIC) {
		root_offset += master->erasesize - 1;
		root_offset &= ~(master->erasesize - 1);
	}

	ar7_parts[2].name = "linux";
	ar7_parts[2].offset = pre_size;
	ar7_parts[2].size = master->size - pre_size - post_size;
	ar7_parts[2].mask_flags = 0;

	ar7_parts[3].name = "rootfs";
	ar7_parts[3].offset = root_offset;
	ar7_parts[3].size = master->size - root_offset - post_size;
	ar7_parts[3].mask_flags = 0;

	*pparts = ar7_parts;
	return AR7_PARTS;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Matteo Croce
526
92.28%
1
16.67%
Atsushi Nemoto
29
5.09%
1
16.67%
David Woodhouse
6
1.05%
1
16.67%
Dmitry Baryshkov
4
0.70%
1
16.67%
Artem B. Bityutskiy
4
0.70%
1
16.67%
Brian Norris
1
0.18%
1
16.67%
Total
570
100.00%
6
100.00%


static struct mtd_part_parser ar7_parser = {
	.parse_fn = create_mtd_partitions,
	.name = "ar7part",
};

module_mtd_part_parser(ar7_parser);

MODULE_LICENSE("GPL");
MODULE_AUTHOR(	"Felix Fietkau <nbd@openwrt.org>, "
		"Eugene Konev <ejka@openwrt.org>");
MODULE_DESCRIPTION("MTD partitioning for TI AR7");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Matteo Croce
610
92.01%
1
10.00%
Atsushi Nemoto
29
4.37%
1
10.00%
David Woodhouse
6
0.90%
1
10.00%
Dmitry Baryshkov
4
0.60%
1
10.00%
Artem B. Bityutskiy
4
0.60%
1
10.00%
Lubomir Rintel
3
0.45%
1
10.00%
Brian Norris
3
0.45%
2
20.00%
Paul Gortmaker
2
0.30%
1
10.00%
Luka Perkov
2
0.30%
1
10.00%
Total
663
100.00%
10
100.00%
Directory: drivers/mtd

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