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230 lines
6.7 KiB
Diff
230 lines
6.7 KiB
Diff
From aec4d5f5ffd0f0092bd9dc21ea90e0bc237d4b74 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Sat, 15 Oct 2022 11:29:50 +0200
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Subject: [PATCH] mtd: parsers: add TP-Link SafeLoader partitions table parser
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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This parser deals with most TP-Link home routers. It reads info about
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partitions and registers them in the MTD subsystem.
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Example from TP-Link Archer C5 V2:
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spi-nor spi0.0: s25fl128s1 (16384 Kbytes)
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15 tplink-safeloader partitions found on MTD device spi0.0
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Creating 15 MTD partitions on "spi0.0":
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0x000000000000-0x000000040000 : "fs-uboot"
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0x000000040000-0x000000440000 : "os-image"
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0x000000440000-0x000000e40000 : "rootfs"
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0x000000e40000-0x000000e40200 : "default-mac"
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0x000000e40200-0x000000e40400 : "pin"
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0x000000e40400-0x000000e40600 : "product-info"
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0x000000e50000-0x000000e60000 : "partition-table"
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0x000000e60000-0x000000e60200 : "soft-version"
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0x000000e61000-0x000000e70000 : "support-list"
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0x000000e70000-0x000000e80000 : "profile"
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0x000000e80000-0x000000e90000 : "default-config"
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0x000000e90000-0x000000ee0000 : "user-config"
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0x000000ee0000-0x000000fe0000 : "log"
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0x000000fe0000-0x000000ff0000 : "radio_bk"
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0x000000ff0000-0x000001000000 : "radio"
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
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Link: https://lore.kernel.org/linux-mtd/20221015092950.27467-2-zajec5@gmail.com
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---
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drivers/mtd/parsers/Kconfig | 15 +++
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drivers/mtd/parsers/Makefile | 1 +
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drivers/mtd/parsers/tplink_safeloader.c | 150 ++++++++++++++++++++++++
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3 files changed, 166 insertions(+)
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create mode 100644 drivers/mtd/parsers/tplink_safeloader.c
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--- a/drivers/mtd/parsers/Kconfig
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+++ b/drivers/mtd/parsers/Kconfig
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@@ -113,6 +113,21 @@ config MTD_AFS_PARTS
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for your particular device. It won't happen automatically. The
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'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.
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+config MTD_PARSER_TPLINK_SAFELOADER
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+ tristate "TP-Link Safeloader partitions parser"
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+ depends on MTD && (ARCH_BCM_5301X || ATH79 || SOC_MT7620 || SOC_MT7621 || COMPILE_TEST)
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+ help
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+ TP-Link home routers use flash partitions to store various data. Info
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+ about flash space layout is stored in a partitions table using a
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+ custom ASCII-based format.
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+
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+ That format was first found in devices with SafeLoader bootloader and
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+ was named after it. Later it was adapted to CFE and U-Boot
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+ bootloaders.
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+
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+ This driver reads partitions table, parses it and creates MTD
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+ partitions.
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+
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config MTD_PARSER_TRX
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tristate "Parser for TRX format partitions"
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depends on MTD && (BCM47XX || ARCH_BCM_5301X || COMPILE_TEST)
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--- a/drivers/mtd/parsers/Makefile
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+++ b/drivers/mtd/parsers/Makefile
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@@ -9,6 +9,7 @@ ofpart-$(CONFIG_MTD_OF_PARTS_BCM4908) +=
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ofpart-$(CONFIG_MTD_OF_PARTS_LINKSYS_NS)+= ofpart_linksys_ns.o
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obj-$(CONFIG_MTD_PARSER_IMAGETAG) += parser_imagetag.o
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obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
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+obj-$(CONFIG_MTD_PARSER_TPLINK_SAFELOADER) += tplink_safeloader.o
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obj-$(CONFIG_MTD_PARSER_TRX) += parser_trx.o
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obj-$(CONFIG_MTD_SHARPSL_PARTS) += sharpslpart.o
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obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o
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--- /dev/null
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+++ b/drivers/mtd/parsers/tplink_safeloader.c
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@@ -0,0 +1,150 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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+/*
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+ * Copyright © 2022 Rafał Miłecki <rafal@milecki.pl>
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.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/of.h>
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+#include <linux/slab.h>
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+
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+#define TPLINK_SAFELOADER_DATA_OFFSET 4
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+#define TPLINK_SAFELOADER_MAX_PARTS 32
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+
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+struct safeloader_cmn_header {
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+ __be32 size;
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+ uint32_t unused;
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+} __packed;
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+
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+static void *mtd_parser_tplink_safeloader_read_table(struct mtd_info *mtd)
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+{
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+ struct safeloader_cmn_header hdr;
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+ struct device_node *np;
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+ size_t bytes_read;
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+ size_t offset;
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+ size_t size;
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+ char *buf;
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+ int err;
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+
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+ np = mtd_get_of_node(mtd);
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+ if (mtd_is_partition(mtd))
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+ of_node_get(np);
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+ else
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+ np = of_get_child_by_name(np, "partitions");
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+
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+ if (of_property_read_u32(np, "partitions-table-offset", (u32 *)&offset)) {
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+ pr_err("Failed to get partitions table offset\n");
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+ goto err_put;
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+ }
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+
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+ err = mtd_read(mtd, offset, sizeof(hdr), &bytes_read, (uint8_t *)&hdr);
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+ if (err && !mtd_is_bitflip(err)) {
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+ pr_err("Failed to read from %s at 0x%zx\n", mtd->name, offset);
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+ goto err_put;
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+ }
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+
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+ size = be32_to_cpu(hdr.size);
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+
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+ buf = kmalloc(size + 1, GFP_KERNEL);
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+ if (!buf)
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+ goto err_put;
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+
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+ err = mtd_read(mtd, offset + sizeof(hdr), size, &bytes_read, buf);
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+ if (err && !mtd_is_bitflip(err)) {
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+ pr_err("Failed to read from %s at 0x%zx\n", mtd->name, offset + sizeof(hdr));
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+ goto err_kfree;
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+ }
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+
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+ buf[size] = '\0';
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+
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+ of_node_put(np);
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+
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+ return buf;
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+
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+err_kfree:
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+ kfree(buf);
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+err_put:
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+ of_node_put(np);
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+ return NULL;
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+}
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+
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+static int mtd_parser_tplink_safeloader_parse(struct mtd_info *mtd,
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+ const 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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+ char name[65];
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+ size_t offset;
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+ size_t bytes;
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+ char *buf;
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+ int idx;
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+ int err;
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+
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+ parts = kcalloc(TPLINK_SAFELOADER_MAX_PARTS, sizeof(*parts), GFP_KERNEL);
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+ if (!parts) {
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+ err = -ENOMEM;
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+ goto err_out;
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+ }
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+
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+ buf = mtd_parser_tplink_safeloader_read_table(mtd);
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+ if (!buf) {
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+ err = -ENOENT;
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+ goto err_out;
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+ }
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+
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+ for (idx = 0, offset = TPLINK_SAFELOADER_DATA_OFFSET;
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+ idx < TPLINK_SAFELOADER_MAX_PARTS &&
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+ sscanf(buf + offset, "partition %64s base 0x%llx size 0x%llx%zn\n",
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+ name, &parts[idx].offset, &parts[idx].size, &bytes) == 3;
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+ idx++, offset += bytes + 1) {
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+ parts[idx].name = kstrdup(name, GFP_KERNEL);
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+ if (!parts[idx].name) {
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+ err = -ENOMEM;
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+ goto err_free;
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+ }
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+ }
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+
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+ if (idx == TPLINK_SAFELOADER_MAX_PARTS)
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+ pr_warn("Reached maximum number of partitions!\n");
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+
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+ kfree(buf);
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+
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+ *pparts = parts;
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+
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+ return idx;
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+
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+err_free:
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+ for (idx -= 1; idx >= 0; idx--)
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+ kfree(parts[idx].name);
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+err_out:
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+ return err;
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+};
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+
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+static void mtd_parser_tplink_safeloader_cleanup(const struct mtd_partition *pparts,
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+ int nr_parts)
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+{
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+ int i;
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+
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+ for (i = 0; i < nr_parts; i++)
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+ kfree(pparts[i].name);
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+
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+ kfree(pparts);
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+}
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+
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+static const struct of_device_id mtd_parser_tplink_safeloader_of_match_table[] = {
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+ { .compatible = "tplink,safeloader-partitions" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, mtd_parser_tplink_safeloader_of_match_table);
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+
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+static struct mtd_part_parser mtd_parser_tplink_safeloader = {
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+ .parse_fn = mtd_parser_tplink_safeloader_parse,
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+ .cleanup = mtd_parser_tplink_safeloader_cleanup,
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+ .name = "tplink-safeloader",
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+ .of_match_table = mtd_parser_tplink_safeloader_of_match_table,
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+};
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+module_mtd_part_parser(mtd_parser_tplink_safeloader);
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+
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+MODULE_LICENSE("GPL");
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