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-rw-r--r--drivers/mtd/Kconfig1
-rw-r--r--drivers/mtd/bcm63xxpart.c155
-rw-r--r--drivers/mtd/parsers/Kconfig11
-rw-r--r--drivers/mtd/parsers/Makefile1
-rw-r--r--drivers/mtd/parsers/parser_imagetag.c214
5 files changed, 235 insertions, 147 deletions
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index aa5a27fdfdd1..0c263df7ded7 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -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.
diff --git a/drivers/mtd/bcm63xxpart.c b/drivers/mtd/bcm63xxpart.c
index f639b4c960f0..b2bd04764e95 100644
--- a/drivers/mtd/bcm63xxpart.c
+++ b/drivers/mtd/bcm63xxpart.c
@@ -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 @@ invalid_tag:
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 @@ invalid_tag:
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;
}
diff --git a/drivers/mtd/parsers/Kconfig b/drivers/mtd/parsers/Kconfig
index fccf1950e92d..c8be3f1507ca 100644
--- a/drivers/mtd/parsers/Kconfig
+++ b/drivers/mtd/parsers/Kconfig
@@ -1,3 +1,14 @@
+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)
diff --git a/drivers/mtd/parsers/Makefile b/drivers/mtd/parsers/Makefile
index d8418bf6804a..3860c4464c63 100644
--- a/drivers/mtd/parsers/Makefile
+++ b/drivers/mtd/parsers/Makefile
@@ -1,3 +1,4 @@
+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
diff --git a/drivers/mtd/parsers/parser_imagetag.c b/drivers/mtd/parsers/parser_imagetag.c
new file mode 100644
index 000000000000..74b66d009b5c
--- /dev/null
+++ b/drivers/mtd/parsers/parser_imagetag.c
@@ -0,0 +1,214 @@
+/*
+ * 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");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.