target/linux/ath79/patches-4.19/405-mtd-tp-link-partition-parser.patch

   1 --- a/drivers/mtd/Kconfig
   2 +++ b/drivers/mtd/Kconfig
   3 @@ -193,6 +193,12 @@ config MTD_MYLOADER_PARTS
   4           You will still need the parsing functions to be called by the driver
   5           for your particular device. It won't happen automatically.
   6
   7 +config MTD_TPLINK_PARTS
   8 +       tristate "TP-Link AR7XXX/AR9XXX partitioning support"
   9 +       depends on ATH79
  10 +       ---help---
  11 +         TBD.
  12 +
  13  comment "User Modules And Translation Layers"
  14
  15  #
  16 --- a/drivers/mtd/Makefile
  17 +++ b/drivers/mtd/Makefile
  18 @@ -18,6 +18,7 @@ obj-$(CONFIG_MTD_BCM63XX_PARTS)       += bcm63
  19  obj-$(CONFIG_MTD_BCM47XX_PARTS)        += bcm47xxpart.o
  20  obj-$(CONFIG_MTD_MYLOADER_PARTS) += myloader.o
  21  obj-y                          += parsers/
  22 +obj-$(CONFIG_MTD_TPLINK_PARTS) += tplinkpart.o
  23
  24  # 'Users' - code which presents functionality to userspace.
  25  obj-$(CONFIG_MTD_BLKDEVS)      += mtd_blkdevs.o
  26 --- /dev/null
  27 +++ b/drivers/mtd/tplinkpart.c
  28 @@ -0,0 +1,222 @@
  29 +/*
  30 + * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
  31 + *
  32 + * This program is free software; you can redistribute it and/or modify it
  33 + * under the terms of the GNU General Public License version 2 as published
  34 + * by the Free Software Foundation.
  35 + */
  36 +
  37 +#include <linux/kernel.h>
  38 +#include <linux/module.h>
  39 +#include <linux/slab.h>
  40 +#include <linux/vmalloc.h>
  41 +#include <linux/magic.h>
  42 +
  43 +#include <linux/mtd/mtd.h>
  44 +#include <linux/mtd/partitions.h>
  45 +#include <linux/version.h>
  46 +
  47 +#define TPLINK_NUM_PARTS       5
  48 +#define TPLINK_HEADER_V1       0x01000000
  49 +#define TPLINK_HEADER_V2       0x02000000
  50 +#define MD5SUM_LEN             16
  51 +
  52 +#define TPLINK_ART_LEN         0x10000
  53 +#define TPLINK_KERNEL_OFFS     0x20000
  54 +#define TPLINK_64K_KERNEL_OFFS 0x10000
  55 +
  56 +struct tplink_fw_header {
  57 +       uint32_t        version;        /* header version */
  58 +       char            vendor_name[24];
  59 +       char            fw_version[36];
  60 +       uint32_t        hw_id;          /* hardware id */
  61 +       uint32_t        hw_rev;         /* hardware revision */
  62 +       uint32_t        unk1;
  63 +       uint8_t         md5sum1[MD5SUM_LEN];
  64 +       uint32_t        unk2;
  65 +       uint8_t         md5sum2[MD5SUM_LEN];
  66 +       uint32_t        unk3;
  67 +       uint32_t        kernel_la;      /* kernel load address */
  68 +       uint32_t        kernel_ep;      /* kernel entry point */
  69 +       uint32_t        fw_length;      /* total length of the firmware */
  70 +       uint32_t        kernel_ofs;     /* kernel data offset */
  71 +       uint32_t        kernel_len;     /* kernel data length */
  72 +       uint32_t        rootfs_ofs;     /* rootfs data offset */
  73 +       uint32_t        rootfs_len;     /* rootfs data length */
  74 +       uint32_t        boot_ofs;       /* bootloader data offset */
  75 +       uint32_t        boot_len;       /* bootloader data length */
  76 +       uint8_t         pad[360];
  77 +} __attribute__ ((packed));
  78 +
  79 +static struct tplink_fw_header *
  80 +tplink_read_header(struct mtd_info *mtd, size_t offset)
  81 +{
  82 +       struct tplink_fw_header *header;
  83 +       size_t header_len;
  84 +       size_t retlen;
  85 +       int ret;
  86 +       u32 t;
  87 +
  88 +       header = vmalloc(sizeof(*header));
  89 +       if (!header)
  90 +               goto err;
  91 +
  92 +       header_len = sizeof(struct tplink_fw_header);
  93 +       ret = mtd_read(mtd, offset, header_len, &retlen,
  94 +                      (unsigned char *) header);
  95 +       if (ret)
  96 +               goto err_free_header;
  97 +
  98 +       if (retlen != header_len)
  99 +               goto err_free_header;
 100 +
 101 +       /* sanity checks */
 102 +       t = be32_to_cpu(header->version);
 103 +       if ((t != TPLINK_HEADER_V1) && (t != TPLINK_HEADER_V2))
 104 +               goto err_free_header;
 105 +
 106 +       t = be32_to_cpu(header->kernel_ofs);
 107 +       if (t != header_len)
 108 +               goto err_free_header;
 109 +
 110 +       return header;
 111 +
 112 +err_free_header:
 113 +       vfree(header);
 114 +err:
 115 +       return NULL;
 116 +}
 117 +
 118 +static int tplink_check_rootfs_magic(struct mtd_info *mtd, size_t offset)
 119 +{
 120 +       u32 magic;
 121 +       size_t retlen;
 122 +       int ret;
 123 +
 124 +       ret = mtd_read(mtd, offset, sizeof(magic), &retlen,
 125 +                      (unsigned char *) &magic);
 126 +       if (ret)
 127 +               return ret;
 128 +
 129 +       if (retlen != sizeof(magic))
 130 +               return -EIO;
 131 +
 132 +       if (le32_to_cpu(magic) != SQUASHFS_MAGIC &&
 133 +           magic != 0x19852003)
 134 +               return -EINVAL;
 135 +
 136 +       return 0;
 137 +}
 138 +
 139 +static int tplink_parse_partitions_offset(struct mtd_info *master,
 140 +                                  const struct mtd_partition **pparts,
 141 +                                  struct mtd_part_parser_data *data,
 142 +                                  size_t offset)
 143 +{
 144 +       struct mtd_partition *parts;
 145 +       struct tplink_fw_header *header;
 146 +       int nr_parts;
 147 +       size_t art_offset;
 148 +       size_t rootfs_offset;
 149 +       size_t squashfs_offset;
 150 +       int ret;
 151 +
 152 +       nr_parts = TPLINK_NUM_PARTS;
 153 +       parts = kzalloc(nr_parts * sizeof(struct mtd_partition), GFP_KERNEL);
 154 +       if (!parts) {
 155 +               ret = -ENOMEM;
 156 +               goto err;
 157 +       }
 158 +
 159 +       header = tplink_read_header(master, offset);
 160 +       if (!header) {
 161 +               pr_notice("%s: no TP-Link header found\n", master->name);
 162 +               ret = -ENODEV;
 163 +               goto err_free_parts;
 164 +       }
 165 +
 166 +       squashfs_offset = offset + sizeof(struct tplink_fw_header) +
 167 +                         be32_to_cpu(header->kernel_len);
 168 +
 169 +       ret = tplink_check_rootfs_magic(master, squashfs_offset);
 170 +       if (ret == 0)
 171 +               rootfs_offset = squashfs_offset;
 172 +       else
 173 +               rootfs_offset = offset + be32_to_cpu(header->rootfs_ofs);
 174 +
 175 +       art_offset = master->size - TPLINK_ART_LEN;
 176 +
 177 +       parts[0].name = "u-boot";
 178 +       parts[0].offset = 0;
 179 +       parts[0].size = offset;
 180 +       parts[0].mask_flags = MTD_WRITEABLE;
 181 +
 182 +       parts[1].name = "kernel";
 183 +       parts[1].offset = offset;
 184 +       parts[1].size = rootfs_offset - offset;
 185 +
 186 +       parts[2].name = "rootfs";
 187 +       parts[2].offset = rootfs_offset;
 188 +       parts[2].size = art_offset - rootfs_offset;
 189 +
 190 +       parts[3].name = "art";
 191 +       parts[3].offset = art_offset;
 192 +       parts[3].size = TPLINK_ART_LEN;
 193 +       parts[3].mask_flags = MTD_WRITEABLE;
 194 +
 195 +       parts[4].name = "firmware";
 196 +       parts[4].offset = offset;
 197 +       parts[4].size = art_offset - offset;
 198 +
 199 +       vfree(header);
 200 +
 201 +       *pparts = parts;
 202 +       return nr_parts;
 203 +
 204 +err_free_parts:
 205 +       kfree(parts);
 206 +err:
 207 +       *pparts = NULL;
 208 +       return ret;
 209 +}
 210 +
 211 +static int tplink_parse_partitions(struct mtd_info *master,
 212 +                                  const struct mtd_partition **pparts,
 213 +                                  struct mtd_part_parser_data *data)
 214 +{
 215 +       return tplink_parse_partitions_offset(master, pparts, data,
 216 +                                             TPLINK_KERNEL_OFFS);
 217 +}
 218 +
 219 +static int tplink_parse_64k_partitions(struct mtd_info *master,
 220 +                                  const struct mtd_partition **pparts,
 221 +                                  struct mtd_part_parser_data *data)
 222 +{
 223 +       return tplink_parse_partitions_offset(master, pparts, data,
 224 +                                             TPLINK_64K_KERNEL_OFFS);
 225 +}
 226 +
 227 +static struct mtd_part_parser tplink_parser = {
 228 +       .owner          = THIS_MODULE,
 229 +       .parse_fn       = tplink_parse_partitions,
 230 +       .name           = "tp-link",
 231 +};
 232 +
 233 +static struct mtd_part_parser tplink_64k_parser = {
 234 +       .owner          = THIS_MODULE,
 235 +       .parse_fn       = tplink_parse_64k_partitions,
 236 +       .name           = "tp-link-64k",
 237 +};
 238 +
 239 +static int __init tplink_parser_init(void)
 240 +{
 241 +       register_mtd_parser(&tplink_parser);
 242 +       register_mtd_parser(&tplink_64k_parser);
 243 +
 244 +       return 0;
 245 +}
 246 +
 247 +module_init(tplink_parser_init);
 248 +
 249 +MODULE_LICENSE("GPL v2");
 250 +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");