release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/mtd/maps/ts5500_flash.c

   1 /*
   2  * ts5500_flash.c -- MTD map driver for Technology Systems TS-5500 board
   3  *
   4  * Copyright (C) 2004 Sean Young <sean@mess.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (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 Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  19  *
  20  * Note:
  21  * - In order for detection to work, jumper 3 must be set.
  22  * - Drive A and B use the resident flash disk (RFD) flash translation layer.
  23  * - If you have created your own jffs file system and the bios overwrites
  24  *   it during boot, try disabling Drive A: and B: in the boot order.
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/mtd/map.h>
  31 #include <linux/mtd/mtd.h>
  32 #include <linux/mtd/partitions.h>
  33 #include <linux/types.h>
  34
  35
  36 #define WINDOW_ADDR     0x09400000
  37 #define WINDOW_SIZE     0x00200000
  38
  39 static struct map_info ts5500_map = {
  40         .name = "TS-5500 Flash",
  41         .size = WINDOW_SIZE,
  42         .bankwidth = 1,
  43         .phys = WINDOW_ADDR
  44 };
  45
  46 static struct mtd_partition ts5500_partitions[] = {
  47         {
  48                 .name = "Drive A",
  49                 .offset = 0,
  50                 .size = 0x0e0000
  51         },
  52         {
  53                 .name = "BIOS",
  54                 .offset = 0x0e0000,
  55                 .size = 0x020000,
  56         },
  57         {
  58                 .name = "Drive B",
  59                 .offset = 0x100000,
  60                 .size = 0x100000
  61         }
  62 };
  63
  64 #define NUM_PARTITIONS ARRAY_SIZE(ts5500_partitions)
  65
  66 static struct mtd_info *mymtd;
  67
  68 static int __init init_ts5500_map(void)
  69 {
  70         int rc = 0;
  71
  72         ts5500_map.virt = ioremap_nocache(ts5500_map.phys, ts5500_map.size);
  73
  74         if (!ts5500_map.virt) {
  75                 printk(KERN_ERR "Failed to ioremap_nocache\n");
  76                 rc = -EIO;
  77                 goto err2;
  78         }
  79
  80         simple_map_init(&ts5500_map);
  81
  82         mymtd = do_map_probe("jedec_probe", &ts5500_map);
  83         if (!mymtd)
  84                 mymtd = do_map_probe("map_rom", &ts5500_map);
  85
  86         if (!mymtd) {
  87                 rc = -ENXIO;
  88                 goto err1;
  89         }
  90
  91         mymtd->owner = THIS_MODULE;
  92         add_mtd_partitions(mymtd, ts5500_partitions, NUM_PARTITIONS);
  93
  94         return 0;
  95
  96 err1:
  97         map_destroy(mymtd);
  98         iounmap(ts5500_map.virt);
  99 err2:
 100         return rc;
 101 }
 102
 103 static void __exit cleanup_ts5500_map(void)
 104 {
 105         if (mymtd) {
 106                 del_mtd_partitions(mymtd);
 107                 map_destroy(mymtd);
 108         }
 109
 110         if (ts5500_map.virt) {
 111                 iounmap(ts5500_map.virt);
 112                 ts5500_map.virt = NULL;
 113         }
 114 }
 115
 116 module_init(init_ts5500_map);
 117 module_exit(cleanup_ts5500_map);
 118
 119 MODULE_LICENSE("GPL");
 120 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 121 MODULE_DESCRIPTION("MTD map driver for Techology Systems TS-5500 board");