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