mtd: bcm63xxpart: move imagetag parsing to its own parser (dd84cb02) · Commits · EulixOS / Software / Kernel

drivers/mtd/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -94,6 +94,7 @@ config MTD_BCM63XX_PARTS
		tristate "BCM63XX CFE partitioning support"
		depends on BCM63XX \|\| BMIPS_GENERIC \|\| COMPILE_TEST
		select CRC32
		select MTD_PARSER_IMAGETAG
		help
		This provides partition parsing for BCM63xx devices with CFE
		bootloaders.

drivers/mtd/bcm63xxpart.c

+8 −147

Original line number	Diff line number	Diff line
		@@ -94,51 +94,19 @@ static int bcm63xx_read_nvram(struct mtd_info *master,
		return 0;
		}

		static int bcm63xx_read_image_tag(struct mtd_info master, const char name,
		loff_t tag_offset, struct bcm_tag *buf)
		{
		int ret;
		size_t retlen;
		u32 computed_crc;

		ret = mtd_read(master, tag_offset, sizeof(buf), &retlen, (void )buf);
		if (ret)
		return ret;

		if (retlen != sizeof(*buf))
		return -EIO;

		computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
		offsetof(struct bcm_tag, header_crc));
		if (computed_crc == buf->header_crc) {
		STR_NULL_TERMINATE(buf->board_id);
		STR_NULL_TERMINATE(buf->tag_version);

		pr_info("%s: CFE image tag found at 0x%llx with version %s, board type %s\n",
		name, tag_offset, buf->tag_version, buf->board_id);

		return 0;
		}

		pr_warn("%s: CFE image tag at 0x%llx CRC invalid (expected %08x, actual %08x)\n",
		name, tag_offset, buf->header_crc, computed_crc);
		return 1;
		}
		static const char * const bcm63xx_cfe_part_types[] = {
		"bcm963xx-imagetag",
		NULL,
		};

		static int bcm63xx_parse_cfe_nor_partitions(struct mtd_info *master,
		const struct mtd_partition *pparts, struct bcm963xx_nvram nvram)
		{
		/* CFE, NVRAM and global Linux are always present */
		int nrparts = 3, curpart = 0;
		struct bcm_tag *buf = NULL;
		struct mtd_partition *parts;
		int ret;
		unsigned int rootfsaddr, kerneladdr, spareaddr;
		unsigned int rootfslen, kernellen, sparelen, totallen;
		int nrparts = 3, curpart = 0;
		unsigned int cfelen, nvramlen;
		unsigned int cfe_erasesize;
		int i;
		bool rootfs_first = false;

		cfe_erasesize = max_t(uint32_t, master->erasesize,
		BCM963XX_CFE_BLOCK_SIZE);
		@@ -147,83 +115,9 @@ static int bcm63xx_parse_cfe_nor_partitions(struct mtd_info *master,
		nvramlen = nvram->psi_size * SZ_1K;
		nvramlen = roundup(nvramlen, cfe_erasesize);

		buf = vmalloc(sizeof(struct bcm_tag));
		if (!buf)
		return -ENOMEM;

		/* Get the tag */
		ret = bcm63xx_read_image_tag(master, "rootfs", cfelen, buf);
		if (!ret) {
		STR_NULL_TERMINATE(buf->flash_image_start);
		if (kstrtouint(buf->flash_image_start, 10, &rootfsaddr) \|\|
		rootfsaddr < BCM963XX_EXTENDED_SIZE) {
		pr_err("invalid rootfs address: %*ph\n",
		(int)sizeof(buf->flash_image_start),
		buf->flash_image_start);
		goto invalid_tag;
		}

		STR_NULL_TERMINATE(buf->kernel_address);
		if (kstrtouint(buf->kernel_address, 10, &kerneladdr) \|\|
		kerneladdr < BCM963XX_EXTENDED_SIZE) {
		pr_err("invalid kernel address: %*ph\n",
		(int)sizeof(buf->kernel_address),
		buf->kernel_address);
		goto invalid_tag;
		}

		STR_NULL_TERMINATE(buf->kernel_length);
		if (kstrtouint(buf->kernel_length, 10, &kernellen)) {
		pr_err("invalid kernel length: %*ph\n",
		(int)sizeof(buf->kernel_length),
		buf->kernel_length);
		goto invalid_tag;
		}

		STR_NULL_TERMINATE(buf->total_length);
		if (kstrtouint(buf->total_length, 10, &totallen)) {
		pr_err("invalid total length: %*ph\n",
		(int)sizeof(buf->total_length),
		buf->total_length);
		goto invalid_tag;
		}

		kerneladdr = kerneladdr - BCM963XX_EXTENDED_SIZE;
		rootfsaddr = rootfsaddr - BCM963XX_EXTENDED_SIZE;
		spareaddr = roundup(totallen, master->erasesize) + cfelen;

		if (rootfsaddr < kerneladdr) {
		/* default Broadcom layout */
		rootfslen = kerneladdr - rootfsaddr;
		rootfs_first = true;
		} else {
		/* OpenWrt layout */
		rootfsaddr = kerneladdr + kernellen;
		rootfslen = spareaddr - rootfsaddr;
		}
		} else if (ret > 0) {
		invalid_tag:
		kernellen = 0;
		rootfslen = 0;
		rootfsaddr = 0;
		spareaddr = cfelen;
		} else {
		goto out;
		}
		sparelen = master->size - spareaddr - nvramlen;

		/* Determine number of partitions */
		if (rootfslen > 0)
		nrparts++;

		if (kernellen > 0)
		nrparts++;

		parts = kzalloc(sizeof(parts) nrparts + 10 * nrparts, GFP_KERNEL);
		if (!parts) {
		ret = -ENOMEM;
		goto out;
		}
		if (!parts)
		return -ENOMEM;

		/* Start building partition list */
		parts[curpart].name = "CFE";
		@@ -231,30 +125,6 @@ static int bcm63xx_parse_cfe_nor_partitions(struct mtd_info *master,
		parts[curpart].size = cfelen;
		curpart++;

		if (kernellen > 0) {
		int kernelpart = curpart;

		if (rootfslen > 0 && rootfs_first)
		kernelpart++;
		parts[kernelpart].name = "kernel";
		parts[kernelpart].offset = kerneladdr;
		parts[kernelpart].size = kernellen;
		curpart++;
		}

		if (rootfslen > 0) {
		int rootfspart = curpart;

		if (kernellen > 0 && rootfs_first)
		rootfspart--;
		parts[rootfspart].name = "rootfs";
		parts[rootfspart].offset = rootfsaddr;
		parts[rootfspart].size = rootfslen;
		if (sparelen > 0 && !rootfs_first)
		parts[rootfspart].size += sparelen;
		curpart++;
		}

		parts[curpart].name = "nvram";
		parts[curpart].offset = master->size - nvramlen;
		parts[curpart].size = nvramlen;
		@@ -264,22 +134,13 @@ static int bcm63xx_parse_cfe_nor_partitions(struct mtd_info *master,
		parts[curpart].name = "linux";
		parts[curpart].offset = cfelen;
		parts[curpart].size = master->size - cfelen - nvramlen;
		parts[curpart].types = bcm63xx_cfe_part_types;

		for (i = 0; i < nrparts; i++)
		pr_info("Partition %d is %s offset %llx and length %llx\n", i,
		parts[i].name, parts[i].offset, parts[i].size);

		pr_info("Spare partition is offset %x and length %x\n", spareaddr,
		sparelen);

		*pparts = parts;
		ret = 0;

		out:
		vfree(buf);

		if (ret)
		return ret;

		return nrparts;
		}

drivers/mtd/parsers/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		config MTD_PARSER_IMAGETAG
		tristate "Parser for BCM963XX Image Tag format partitions"
		depends on BCM63XX \|\| BMIPS_GENERIC \|\| COMPILE_TEST
		select CRC32
		help
		Image Tag is the firmware header used by broadcom on their xDSL line
		of devices. It is used to describe the offsets and lengths of kernel
		and rootfs partitions.
		This driver adds support for parsing a partition with an Image Tag
		header and creates up to two partitions, kernel and rootfs.

		config MTD_PARSER_TRX
		tristate "Parser for TRX format partitions"
		depends on MTD && (BCM47XX \|\| ARCH_BCM_5301X \|\| COMPILE_TEST)

drivers/mtd/parsers/Makefile

+1 −0

Original line number	Diff line number	Diff line
		obj-$(CONFIG_MTD_PARSER_IMAGETAG) += parser_imagetag.o
		obj-$(CONFIG_MTD_PARSER_TRX) += parser_trx.o
		obj-$(CONFIG_MTD_SHARPSL_PARTS) += sharpslpart.o
		obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o

drivers/mtd/parsers/parser_imagetag.c

0 → 100644

+214 −0

Original line number	Diff line number	Diff line
		/*
		* BCM63XX CFE image tag parser
		*
		* Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org>
		* Mike Albon <malbon@openwrt.org>
		* Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
		* Copyright © 2011-2013 Jonas Gorski <jonas.gorski@gmail.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.
		*
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/bcm963xx_tag.h>
		#include <linux/crc32.h>
		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/sizes.h>
		#include <linux/slab.h>
		#include <linux/vmalloc.h>
		#include <linux/mtd/mtd.h>
		#include <linux/mtd/partitions.h>

		/* Ensure strings read from flash structs are null terminated */
		#define STR_NULL_TERMINATE(x) \
		do { char *_str = (x); _str[sizeof(x) - 1] = 0; } while (0)

		static int bcm963xx_read_imagetag(struct mtd_info master, const char name,
		loff_t tag_offset, struct bcm_tag *buf)
		{
		int ret;
		size_t retlen;
		u32 computed_crc;

		ret = mtd_read(master, tag_offset, sizeof(buf), &retlen, (void )buf);
		if (ret)
		return ret;

		if (retlen != sizeof(*buf))
		return -EIO;

		computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
		offsetof(struct bcm_tag, header_crc));
		if (computed_crc == buf->header_crc) {
		STR_NULL_TERMINATE(buf->board_id);
		STR_NULL_TERMINATE(buf->tag_version);

		pr_info("%s: CFE image tag found at 0x%llx with version %s, board type %s\n",
		name, tag_offset, buf->tag_version, buf->board_id);

		return 0;
		}

		pr_warn("%s: CFE image tag at 0x%llx CRC invalid (expected %08x, actual %08x)\n",
		name, tag_offset, buf->header_crc, computed_crc);
		return -EINVAL;
		}

		static int bcm963xx_parse_imagetag_partitions(struct mtd_info *master,
		const struct mtd_partition **pparts,
		struct mtd_part_parser_data *data)
		{
		/* CFE, NVRAM and global Linux are always present */
		int nrparts = 0, curpart = 0;
		struct bcm_tag *buf = NULL;
		struct mtd_partition *parts;
		int ret;
		unsigned int rootfsaddr, kerneladdr, spareaddr, offset;
		unsigned int rootfslen, kernellen, sparelen, totallen;
		int i;
		bool rootfs_first = false;

		buf = vmalloc(sizeof(struct bcm_tag));
		if (!buf)
		return -ENOMEM;

		/* Get the tag */
		ret = bcm963xx_read_imagetag(master, "rootfs", 0, buf);
		if (!ret) {
		STR_NULL_TERMINATE(buf->flash_image_start);
		if (kstrtouint(buf->flash_image_start, 10, &rootfsaddr) \|\|
		rootfsaddr < BCM963XX_EXTENDED_SIZE) {
		pr_err("invalid rootfs address: %*ph\n",
		(int)sizeof(buf->flash_image_start),
		buf->flash_image_start);
		goto out;
		}

		STR_NULL_TERMINATE(buf->kernel_address);
		if (kstrtouint(buf->kernel_address, 10, &kerneladdr) \|\|
		kerneladdr < BCM963XX_EXTENDED_SIZE) {
		pr_err("invalid kernel address: %*ph\n",
		(int)sizeof(buf->kernel_address),
		buf->kernel_address);
		goto out;
		}

		STR_NULL_TERMINATE(buf->kernel_length);
		if (kstrtouint(buf->kernel_length, 10, &kernellen)) {
		pr_err("invalid kernel length: %*ph\n",
		(int)sizeof(buf->kernel_length),
		buf->kernel_length);
		goto out;
		}

		STR_NULL_TERMINATE(buf->total_length);
		if (kstrtouint(buf->total_length, 10, &totallen)) {
		pr_err("invalid total length: %*ph\n",
		(int)sizeof(buf->total_length),
		buf->total_length);
		goto out;
		}

		/*
		* Addresses are flash absolute, so convert to partition
		* relative addresses. Assume either kernel or rootfs will
		* directly follow the image tag.
		*/
		if (rootfsaddr < kerneladdr)
		offset = rootfsaddr - sizeof(struct bcm_tag);
		else
		offset = kerneladdr - sizeof(struct bcm_tag);

		kerneladdr = kerneladdr - offset;
		rootfsaddr = rootfsaddr - offset;
		spareaddr = roundup(totallen, master->erasesize);

		if (rootfsaddr < kerneladdr) {
		/* default Broadcom layout */
		rootfslen = kerneladdr - rootfsaddr;
		rootfs_first = true;
		} else {
		/* OpenWrt layout */
		rootfsaddr = kerneladdr + kernellen;
		rootfslen = spareaddr - rootfsaddr;
		}
		} else {
		goto out;
		}
		sparelen = master->size - spareaddr;

		/* Determine number of partitions */
		if (rootfslen > 0)
		nrparts++;

		if (kernellen > 0)
		nrparts++;

		parts = kzalloc(sizeof(parts) nrparts + 10 * nrparts, GFP_KERNEL);
		if (!parts) {
		ret = -ENOMEM;
		goto out;
		}

		/* Start building partition list */
		if (kernellen > 0) {
		int kernelpart = curpart;

		if (rootfslen > 0 && rootfs_first)
		kernelpart++;
		parts[kernelpart].name = "kernel";
		parts[kernelpart].offset = kerneladdr;
		parts[kernelpart].size = kernellen;
		curpart++;
		}

		if (rootfslen > 0) {
		int rootfspart = curpart;

		if (kernellen > 0 && rootfs_first)
		rootfspart--;
		parts[rootfspart].name = "rootfs";
		parts[rootfspart].offset = rootfsaddr;
		parts[rootfspart].size = rootfslen;
		if (sparelen > 0 && !rootfs_first)
		parts[rootfspart].size += sparelen;
		curpart++;
		}

		for (i = 0; i < nrparts; i++)
		pr_info("Partition %d is %s offset %llx and length %llx\n", i,
		parts[i].name, parts[i].offset, parts[i].size);

		pr_info("Spare partition is offset %x and length %x\n", spareaddr,
		sparelen);

		*pparts = parts;
		ret = 0;

		out:
		vfree(buf);

		if (ret)
		return ret;

		return nrparts;
		}

		static struct mtd_part_parser bcm963xx_imagetag_parser = {
		.parse_fn = bcm963xx_parse_imagetag_partitions,
		.name = "bcm963xx-imagetag",
		};
		module_mtd_part_parser(bcm963xx_imagetag_parser);

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
		MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
		MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
		MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com>");
		MODULE_DESCRIPTION("MTD parser for BCM963XX CFE Image Tag partitions");