target/linux/rdc/files-2.6.30/arch/x86/mach-rdc321x/boards/bifferboard.c

   1 /*
   2  *  Bifferboard RDC321x platform devices
   3  *
   4  *  Copyright (C) 2010 bifferos@yahoo.co.uk
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version 2
   9  *  of the License, or (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the
  18  *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  *  Boston, MA  02110-1301, USA.
  20  *
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/mtd/physmap.h>
  25 #include <linux/input.h>
  26
  27 #include <asm/rdc_boards.h>
  28
  29 static int __init parse_bifferboard_partitions(struct mtd_info *master, struct mtd_partition **pparts, unsigned long plat_data)
  30 {
  31         int res;
  32         size_t len;
  33         struct mtd_partition *rdc_flash_parts;
  34         u32 kernel_len;
  35         u16 tmp;
  36
  37         if (master->size == 0x100000)
  38                 kernel_len = master->size - 0x10000;
  39         else {
  40                 res =  master->read(master, 0x4000 + 1036, 2, &len, (char *) &tmp);
  41                 if (res)
  42                         return res;
  43                 kernel_len = tmp * master->erasesize;
  44         }
  45
  46         rdc_flash_parts = kzalloc(sizeof(struct mtd_partition) * 4, GFP_KERNEL);
  47
  48         *pparts = rdc_flash_parts;
  49
  50         rdc_flash_parts[0].name = "biffboot";
  51         rdc_flash_parts[0].offset = master->size - 0x10000;
  52         rdc_flash_parts[0].size = 0x10000;
  53         rdc_flash_parts[0].mask_flags = MTD_WRITEABLE;
  54         rdc_flash_parts[1].name = "firmware";
  55         rdc_flash_parts[1].offset = 0;
  56         rdc_flash_parts[1].size = rdc_flash_parts[0].offset;
  57         rdc_flash_parts[2].name = "kernel";
  58         rdc_flash_parts[2].offset = 0x00000000;
  59         rdc_flash_parts[2].size = kernel_len;
  60
  61         if (master->size == 0x100000)
  62                 return 2;
  63
  64         rdc_flash_parts[3].name = "rootfs";
  65         rdc_flash_parts[3].offset = MTDPART_OFS_APPEND;
  66         rdc_flash_parts[3].size = rdc_flash_parts[1].size - rdc_flash_parts[2].size;
  67
  68         return 4;
  69 }
  70
  71 struct mtd_part_parser __initdata bifferboard_parser = {
  72         .owner = THIS_MODULE,
  73         .parse_fn = parse_bifferboard_partitions,
  74         .name = "Bifferboard",
  75 };
  76
  77 static int __init bifferboard_setup(void)
  78 {
  79         return register_mtd_parser(&bifferboard_parser);
  80 }
  81
  82 arch_initcall(bifferboard_setup);