forked from luck/tmp_suning_uos_patched
mtd: bcm47part driver for BCM47XX chipsets
This driver provides parser detecting partitions on BCM47XX flash memories. It has many differences in comparison to BCM63XX, like: 1) Different CFE with no more trivial MAGICs 2) More partitions types (board_data, ML, POT) 3) Supporting more than 1 flash on a device which resulted in decision of writing new parser. It uses generic mtd interface and was successfully tested with Netgear WNDR4500 router which has 2 flash memories: serial one and NAND one. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Rafał Miłecki
David Woodhouse
parent
aa3c5dc52e
commit
3cf7f1314e
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@ -148,6 +148,13 @@ config MTD_BCM63XX_PARTS
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This provides partions parsing for BCM63xx devices with CFE
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bootloaders.
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config MTD_BCM47XX_PARTS
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tristate "BCM47XX partitioning support"
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depends on BCM47XX
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help
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This provides partitions parser for devices based on BCM47xx
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boards.
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comment "User Modules And Translation Layers"
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config MTD_CHAR
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@ -12,6 +12,7 @@ obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o
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obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
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obj-$(CONFIG_MTD_AR7_PARTS) += ar7part.o
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obj-$(CONFIG_MTD_BCM63XX_PARTS) += bcm63xxpart.o
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obj-$(CONFIG_MTD_BCM47XX_PARTS) += bcm47xxpart.o
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# 'Users' - code which presents functionality to userspace.
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obj-$(CONFIG_MTD_CHAR) += mtdchar.o
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202
drivers/mtd/bcm47xxpart.c
Normal file
202
drivers/mtd/bcm47xxpart.c
Normal file
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@ -0,0 +1,202 @@
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/*
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* BCM47XX MTD partitioning
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*
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* Copyright © 2012 Rafał Miłecki <zajec5@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <asm/mach-bcm47xx/nvram.h>
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/* 10 parts were found on sflash on Netgear WNDR4500 */
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#define BCM47XXPART_MAX_PARTS 12
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/*
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* Amount of bytes we read when analyzing each block of flash memory.
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* Set it big enough to allow detecting partition and reading important data.
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*/
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#define BCM47XXPART_BYTES_TO_READ 0x404
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/* Magics */
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#define BOARD_DATA_MAGIC 0x5246504D /* MPFR */
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#define POT_MAGIC1 0x54544f50 /* POTT */
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#define POT_MAGIC2 0x504f /* OP */
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#define ML_MAGIC1 0x39685a42
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#define ML_MAGIC2 0x26594131
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#define TRX_MAGIC 0x30524448
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struct trx_header {
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uint32_t magic;
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uint32_t length;
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uint32_t crc32;
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uint16_t flags;
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uint16_t version;
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uint32_t offset[3];
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} __packed;
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static void bcm47xxpart_add_part(struct mtd_partition *part, char *name,
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u64 offset, uint32_t mask_flags)
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{
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part->name = name;
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part->offset = offset;
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part->mask_flags = mask_flags;
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}
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static int bcm47xxpart_parse(struct mtd_info *master,
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struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct mtd_partition *parts;
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uint8_t i, curr_part = 0;
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uint32_t *buf;
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size_t bytes_read;
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uint32_t offset;
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uint32_t blocksize = 0x10000;
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struct trx_header *trx;
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/* Alloc */
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parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,
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GFP_KERNEL);
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buf = kzalloc(BCM47XXPART_BYTES_TO_READ, GFP_KERNEL);
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/* Parse block by block looking for magics */
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for (offset = 0; offset <= master->size - blocksize;
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offset += blocksize) {
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/* Nothing more in higher memory */
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if (offset >= 0x2000000)
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break;
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if (curr_part > BCM47XXPART_MAX_PARTS) {
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pr_warn("Reached maximum number of partitions, scanning stopped!\n");
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break;
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}
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/* Read beginning of the block */
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if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
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&bytes_read, (uint8_t *)buf) < 0) {
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pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
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offset);
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continue;
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}
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/* CFE has small NVRAM at 0x400 */
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if (buf[0x400 / 4] == NVRAM_HEADER) {
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bcm47xxpart_add_part(&parts[curr_part++], "boot",
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offset, MTD_WRITEABLE);
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continue;
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}
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/* Standard NVRAM */
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if (buf[0x000 / 4] == NVRAM_HEADER) {
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bcm47xxpart_add_part(&parts[curr_part++], "nvram",
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offset, 0);
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continue;
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}
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/*
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* board_data starts with board_id which differs across boards,
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* but we can use 'MPFR' (hopefully) magic at 0x100
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*/
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if (buf[0x100 / 4] == BOARD_DATA_MAGIC) {
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bcm47xxpart_add_part(&parts[curr_part++], "board_data",
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offset, MTD_WRITEABLE);
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continue;
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}
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/* POT(TOP) */
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if (buf[0x000 / 4] == POT_MAGIC1 &&
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(buf[0x004 / 4] & 0xFFFF) == POT_MAGIC2) {
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bcm47xxpart_add_part(&parts[curr_part++], "POT", offset,
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MTD_WRITEABLE);
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continue;
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}
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/* ML */
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if (buf[0x010 / 4] == ML_MAGIC1 &&
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buf[0x014 / 4] == ML_MAGIC2) {
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bcm47xxpart_add_part(&parts[curr_part++], "ML", offset,
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MTD_WRITEABLE);
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continue;
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}
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/* TRX */
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if (buf[0x000 / 4] == TRX_MAGIC) {
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trx = (struct trx_header *)buf;
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i = 0;
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/* We have LZMA loader if offset[2] points to sth */
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if (trx->offset[2]) {
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bcm47xxpart_add_part(&parts[curr_part++],
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"loader",
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offset + trx->offset[i],
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0);
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i++;
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}
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bcm47xxpart_add_part(&parts[curr_part++], "linux",
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offset + trx->offset[i], 0);
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i++;
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/*
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* Pure rootfs size is known and can be calculated as:
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* trx->length - trx->offset[i]. We don't fill it as
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* we want to have jffs2 (overlay) in the same mtd.
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*/
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bcm47xxpart_add_part(&parts[curr_part++], "rootfs",
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offset + trx->offset[i], 0);
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i++;
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/*
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* We have whole TRX scanned, skip to the next part. Use
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* roundown (not roundup), as the loop will increase
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* offset in next step.
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*/
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offset = rounddown(offset + trx->length, blocksize);
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continue;
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}
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}
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kfree(buf);
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/*
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* Assume that partitions end at the beginning of the one they are
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* followed by.
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*/
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for (i = 0; i < curr_part - 1; i++)
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parts[i].size = parts[i + 1].offset - parts[i].offset;
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if (curr_part > 0)
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parts[curr_part - 1].size =
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master->size - parts[curr_part - 1].offset;
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*pparts = parts;
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return curr_part;
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};
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static struct mtd_part_parser bcm47xxpart_mtd_parser = {
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.owner = THIS_MODULE,
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.parse_fn = bcm47xxpart_parse,
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.name = "bcm47xxpart",
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};
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static int __init bcm47xxpart_init(void)
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{
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return register_mtd_parser(&bcm47xxpart_mtd_parser);
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}
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static void __exit bcm47xxpart_exit(void)
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{
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deregister_mtd_parser(&bcm47xxpart_mtd_parser);
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}
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module_init(bcm47xxpart_init);
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module_exit(bcm47xxpart_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MTD partitioning for BCM47XX flash memories");
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