target/linux/ar71xx/files/drivers/mtd/wrt160nl_part.c

   1 /*
   2  * Copyright © 2009 Christian Daniel <cd@maintech.de>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  *
  18  * TRX flash partition table.
  19  * Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
  20  *
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/slab.h>
  25
  26 #include <linux/mtd/mtd.h>
  27 #include <linux/mtd/partitions.h>
  28 #include <linux/bootmem.h>
  29 #include <linux/magic.h>
  30
  31 #define TRX_PARTS       6
  32 #define TRX_MAGIC       0x30524448
  33 #define TRX_MAX_OFFSET  3
  34
  35 struct trx_header {
  36         uint32_t magic;           /* "HDR0" */
  37         uint32_t len;             /* Length of file including header */
  38         uint32_t crc32;           /* 32-bit CRC from flag_version to end of file */
  39         uint32_t flag_version;    /* 0:15 flags, 16:31 version */
  40         uint32_t offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
  41 };
  42
  43 #define IH_MAGIC        0x27051956      /* Image Magic Number */
  44 #define IH_NMLEN        32              /* Image Name Length */
  45
  46 struct uimage_header {
  47         uint32_t        ih_magic;       /* Image Header Magic Number */
  48         uint32_t        ih_hcrc;        /* Image Header CRC Checksum */
  49         uint32_t        ih_time;        /* Image Creation Timestamp */
  50         uint32_t        ih_size;        /* Image Data Size */
  51         uint32_t        ih_load;        /* Data» Load  Address */
  52         uint32_t        ih_ep;          /* Entry Point Address */
  53         uint32_t        ih_dcrc;        /* Image Data CRC Checksum */
  54         uint8_t         ih_os;          /* Operating System */
  55         uint8_t         ih_arch;        /* CPU architecture */
  56         uint8_t         ih_type;        /* Image Type */
  57         uint8_t         ih_comp;        /* Compression Type */
  58         uint8_t         ih_name[IH_NMLEN];      /* Image Name */
  59 };
  60
  61 static struct mtd_partition trx_parts[TRX_PARTS];
  62
  63 static int create_mtd_partitions(struct mtd_info *master,
  64                                  struct mtd_partition **pparts,
  65                                  unsigned long origin)
  66 {
  67         uint8_t buf[512];
  68         int len;
  69         struct trx_header *header;
  70         struct uimage_header *uheader;
  71         unsigned int kernel_len;
  72
  73         master->read(master, 4 * master->erasesize, sizeof(buf), &len, buf);
  74         if (strncmp(buf, "NL16", 4) == 0) {
  75                 printk(KERN_INFO "TRX on WRT160NL detected\n");
  76
  77                 header = (struct trx_header *)(buf + 32);
  78                 if (le32_to_cpu(header->magic) != TRX_MAGIC) {
  79                         printk(KERN_WARNING "TRX messed up\n");
  80                         return 0;
  81                 }
  82
  83                 uheader = (struct uimage_header *)(buf + 60);
  84                 if (uheader->ih_magic != IH_MAGIC) {
  85                         printk(KERN_WARNING "uImage messed up\n");
  86                         return 0;
  87                 }
  88
  89                 kernel_len = uheader->ih_size / master->erasesize;
  90                 if (uheader->ih_size % master->erasesize)
  91                         kernel_len++;
  92
  93                 kernel_len++;
  94                 kernel_len *= master->erasesize;
  95
  96                 trx_parts[0].name = "u-boot";
  97                 trx_parts[0].offset = 0;
  98                 trx_parts[0].size = 4 * master->erasesize;
  99                 trx_parts[0].mask_flags = MTD_WRITEABLE;
 100
 101                 trx_parts[1].name = "kernel";
 102                 trx_parts[1].offset = trx_parts[0].offset + trx_parts[0].size;
 103                 trx_parts[1].size = kernel_len;
 104                 trx_parts[1].mask_flags = 0;
 105
 106                 trx_parts[2].name = "rootfs";
 107                 trx_parts[2].offset = trx_parts[1].offset + trx_parts[1].size;
 108                 trx_parts[2].size = master->size - 6 * master->erasesize - trx_parts[1].size;
 109                 trx_parts[2].mask_flags = 0;
 110
 111                 trx_parts[3].name = "nvram";
 112                 trx_parts[3].offset = master->size - 2 * master->erasesize;
 113                 trx_parts[3].size = master->erasesize;
 114                 trx_parts[3].mask_flags = MTD_WRITEABLE;
 115
 116                 trx_parts[4].name = "art";
 117                 trx_parts[4].offset = master->size - master->erasesize;
 118                 trx_parts[4].size = master->erasesize;
 119                 trx_parts[4].mask_flags = MTD_WRITEABLE;
 120
 121                 trx_parts[5].name = "firmware";
 122                 trx_parts[5].offset = 4 * master->erasesize;
 123                 trx_parts[5].size = master->size - 6 * master->erasesize;
 124                 trx_parts[5].mask_flags = 0;
 125
 126                 *pparts = trx_parts;
 127
 128                 return TRX_PARTS;
 129         } else {
 130                 return 0;
 131         }
 132 }
 133
 134 static struct mtd_part_parser trx_parser = {
 135         .owner          = THIS_MODULE,
 136         .parse_fn       = create_mtd_partitions,
 137         .name           = "wrt160nl",
 138 };
 139
 140 static int __init trx_parser_init(void)
 141 {
 142         return register_mtd_parser(&trx_parser);
 143 }
 144
 145 module_init(trx_parser_init);
 146
 147 MODULE_LICENSE("GPL");
 148 MODULE_AUTHOR("Christian Daniel <cd@maintech.de>");