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   1 From aec4d5f5ffd0f0092bd9dc21ea90e0bc237d4b74 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Sat, 15 Oct 2022 11:29:50 +0200
   4 Subject: [PATCH] mtd: parsers: add TP-Link SafeLoader partitions table parser
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 This parser deals with most TP-Link home routers. It reads info about
  10 partitions and registers them in the MTD subsystem.
  11
  12 Example from TP-Link Archer C5 V2:
  13
  14 spi-nor spi0.0: s25fl128s1 (16384 Kbytes)
  15 15 tplink-safeloader partitions found on MTD device spi0.0
  16 Creating 15 MTD partitions on "spi0.0":
  17 0x000000000000-0x000000040000 : "fs-uboot"
  18 0x000000040000-0x000000440000 : "os-image"
  19 0x000000440000-0x000000e40000 : "rootfs"
  20 0x000000e40000-0x000000e40200 : "default-mac"
  21 0x000000e40200-0x000000e40400 : "pin"
  22 0x000000e40400-0x000000e40600 : "product-info"
  23 0x000000e50000-0x000000e60000 : "partition-table"
  24 0x000000e60000-0x000000e60200 : "soft-version"
  25 0x000000e61000-0x000000e70000 : "support-list"
  26 0x000000e70000-0x000000e80000 : "profile"
  27 0x000000e80000-0x000000e90000 : "default-config"
  28 0x000000e90000-0x000000ee0000 : "user-config"
  29 0x000000ee0000-0x000000fe0000 : "log"
  30 0x000000fe0000-0x000000ff0000 : "radio_bk"
  31 0x000000ff0000-0x000001000000 : "radio"
  32
  33 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  34 Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
  35 Link: https://lore.kernel.org/linux-mtd/20221015092950.27467-2-zajec5@gmail.com
  36 ---
  37  drivers/mtd/parsers/Kconfig             |  15 +++
  38  drivers/mtd/parsers/Makefile            |   1 +
  39  drivers/mtd/parsers/tplink_safeloader.c | 150 ++++++++++++++++++++++++
  40  3 files changed, 166 insertions(+)
  41  create mode 100644 drivers/mtd/parsers/tplink_safeloader.c
  42
  43 --- a/drivers/mtd/parsers/Kconfig
  44 +++ b/drivers/mtd/parsers/Kconfig
  45 @@ -113,6 +113,21 @@ config MTD_AFS_PARTS
  46           for your particular device. It won't happen automatically. The
  47           'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.
  48
  49 +config MTD_PARSER_TPLINK_SAFELOADER
  50 +       tristate "TP-Link Safeloader partitions parser"
  51 +       depends on MTD && (ARCH_BCM_5301X || ATH79 || SOC_MT7620 || SOC_MT7621 || COMPILE_TEST)
  52 +       help
  53 +         TP-Link home routers use flash partitions to store various data. Info
  54 +         about flash space layout is stored in a partitions table using a
  55 +         custom ASCII-based format.
  56 +
  57 +         That format was first found in devices with SafeLoader bootloader and
  58 +         was named after it. Later it was adapted to CFE and U-Boot
  59 +         bootloaders.
  60 +
  61 +         This driver reads partitions table, parses it and creates MTD
  62 +         partitions.
  63 +
  64  config MTD_PARSER_TRX
  65         tristate "Parser for TRX format partitions"
  66         depends on MTD && (BCM47XX || ARCH_BCM_5301X || ARCH_MEDIATEK || RALINK || COMPILE_TEST)
  67 --- a/drivers/mtd/parsers/Makefile
  68 +++ b/drivers/mtd/parsers/Makefile
  69 @@ -9,6 +9,7 @@ ofpart-$(CONFIG_MTD_OF_PARTS_BCM4908)   +=
  70  ofpart-$(CONFIG_MTD_OF_PARTS_LINKSYS_NS)+= ofpart_linksys_ns.o
  71  obj-$(CONFIG_MTD_PARSER_IMAGETAG)      += parser_imagetag.o
  72  obj-$(CONFIG_MTD_AFS_PARTS)            += afs.o
  73 +obj-$(CONFIG_MTD_PARSER_TPLINK_SAFELOADER)     += tplink_safeloader.o
  74  obj-$(CONFIG_MTD_PARSER_TRX)           += parser_trx.o
  75  obj-$(CONFIG_MTD_SERCOMM_PARTS)                += scpart.o
  76  obj-$(CONFIG_MTD_SHARPSL_PARTS)                += sharpslpart.o
  77 --- /dev/null
  78 +++ b/drivers/mtd/parsers/tplink_safeloader.c
  79 @@ -0,0 +1,150 @@
  80 +// SPDX-License-Identifier: GPL-2.0-only
  81 +/*
  82 + * Copyright © 2022 Rafał Miłecki <rafal@milecki.pl>
  83 + */
  84 +
  85 +#include <linux/kernel.h>
  86 +#include <linux/module.h>
  87 +#include <linux/mtd/mtd.h>
  88 +#include <linux/mtd/partitions.h>
  89 +#include <linux/of.h>
  90 +#include <linux/slab.h>
  91 +
  92 +#define TPLINK_SAFELOADER_DATA_OFFSET          4
  93 +#define TPLINK_SAFELOADER_MAX_PARTS            32
  94 +
  95 +struct safeloader_cmn_header {
  96 +       __be32 size;
  97 +       uint32_t unused;
  98 +} __packed;
  99 +
 100 +static void *mtd_parser_tplink_safeloader_read_table(struct mtd_info *mtd)
 101 +{
 102 +       struct safeloader_cmn_header hdr;
 103 +       struct device_node *np;
 104 +       size_t bytes_read;
 105 +       size_t offset;
 106 +       size_t size;
 107 +       char *buf;
 108 +       int err;
 109 +
 110 +       np = mtd_get_of_node(mtd);
 111 +       if (mtd_is_partition(mtd))
 112 +               of_node_get(np);
 113 +       else
 114 +               np = of_get_child_by_name(np, "partitions");
 115 +
 116 +       if (of_property_read_u32(np, "partitions-table-offset", (u32 *)&offset)) {
 117 +               pr_err("Failed to get partitions table offset\n");
 118 +               goto err_put;
 119 +       }
 120 +
 121 +       err = mtd_read(mtd, offset, sizeof(hdr), &bytes_read, (uint8_t *)&hdr);
 122 +       if (err && !mtd_is_bitflip(err)) {
 123 +               pr_err("Failed to read from %s at 0x%zx\n", mtd->name, offset);
 124 +               goto err_put;
 125 +       }
 126 +
 127 +       size = be32_to_cpu(hdr.size);
 128 +
 129 +       buf = kmalloc(size + 1, GFP_KERNEL);
 130 +       if (!buf)
 131 +               goto err_put;
 132 +
 133 +       err = mtd_read(mtd, offset + sizeof(hdr), size, &bytes_read, buf);
 134 +       if (err && !mtd_is_bitflip(err)) {
 135 +               pr_err("Failed to read from %s at 0x%zx\n", mtd->name, offset + sizeof(hdr));
 136 +               goto err_kfree;
 137 +       }
 138 +
 139 +       buf[size] = '\0';
 140 +
 141 +       of_node_put(np);
 142 +
 143 +       return buf;
 144 +
 145 +err_kfree:
 146 +       kfree(buf);
 147 +err_put:
 148 +       of_node_put(np);
 149 +       return NULL;
 150 +}
 151 +
 152 +static int mtd_parser_tplink_safeloader_parse(struct mtd_info *mtd,
 153 +                                             const struct mtd_partition **pparts,
 154 +                                             struct mtd_part_parser_data *data)
 155 +{
 156 +       struct mtd_partition *parts;
 157 +       char name[65];
 158 +       size_t offset;
 159 +       size_t bytes;
 160 +       char *buf;
 161 +       int idx;
 162 +       int err;
 163 +
 164 +       parts = kcalloc(TPLINK_SAFELOADER_MAX_PARTS, sizeof(*parts), GFP_KERNEL);
 165 +       if (!parts) {
 166 +               err = -ENOMEM;
 167 +               goto err_out;
 168 +       }
 169 +
 170 +       buf = mtd_parser_tplink_safeloader_read_table(mtd);
 171 +       if (!buf) {
 172 +               err = -ENOENT;
 173 +               goto err_out;
 174 +       }
 175 +
 176 +       for (idx = 0, offset = TPLINK_SAFELOADER_DATA_OFFSET;
 177 +            idx < TPLINK_SAFELOADER_MAX_PARTS &&
 178 +            sscanf(buf + offset, "partition %64s base 0x%llx size 0x%llx%zn\n",
 179 +                   name, &parts[idx].offset, &parts[idx].size, &bytes) == 3;
 180 +            idx++, offset += bytes + 1) {
 181 +               parts[idx].name = kstrdup(name, GFP_KERNEL);
 182 +               if (!parts[idx].name) {
 183 +                       err = -ENOMEM;
 184 +                       goto err_free;
 185 +               }
 186 +       }
 187 +
 188 +       if (idx == TPLINK_SAFELOADER_MAX_PARTS)
 189 +               pr_warn("Reached maximum number of partitions!\n");
 190 +
 191 +       kfree(buf);
 192 +
 193 +       *pparts = parts;
 194 +
 195 +       return idx;
 196 +
 197 +err_free:
 198 +       for (idx -= 1; idx >= 0; idx--)
 199 +               kfree(parts[idx].name);
 200 +err_out:
 201 +       return err;
 202 +};
 203 +
 204 +static void mtd_parser_tplink_safeloader_cleanup(const struct mtd_partition *pparts,
 205 +                                                int nr_parts)
 206 +{
 207 +       int i;
 208 +
 209 +       for (i = 0; i < nr_parts; i++)
 210 +               kfree(pparts[i].name);
 211 +
 212 +       kfree(pparts);
 213 +}
 214 +
 215 +static const struct of_device_id mtd_parser_tplink_safeloader_of_match_table[] = {
 216 +       { .compatible = "tplink,safeloader-partitions" },
 217 +       {},
 218 +};
 219 +MODULE_DEVICE_TABLE(of, mtd_parser_tplink_safeloader_of_match_table);
 220 +
 221 +static struct mtd_part_parser mtd_parser_tplink_safeloader = {
 222 +       .parse_fn = mtd_parser_tplink_safeloader_parse,
 223 +       .cleanup = mtd_parser_tplink_safeloader_cleanup,
 224 +       .name = "tplink-safeloader",
 225 +       .of_match_table = mtd_parser_tplink_safeloader_of_match_table,
 226 +};
 227 +module_mtd_part_parser(mtd_parser_tplink_safeloader);
 228 +
 229 +MODULE_LICENSE("GPL");