drivers/mtd/maps/netsc520.c

   1 /* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board
   2  *
   3  * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com)
   4  *      based on sc520cdp.c by Sysgo Real-Time Solutions GmbH
   5  *
   6  * $Id: netsc520.c,v 1.14 2005/11/07 11:14:27 gleixner Exp $
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  21  *
  22  * The NetSc520 is a demonstration board for the Elan Sc520 processor available
  23  * from AMD.  It has a single back of 16 megs of 32-bit Flash ROM and another
  24  * 16 megs of SDRAM.
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/types.h>
  29 #include <linux/kernel.h>
  30 #include <linux/init.h>
  31 #include <asm/io.h>
  32 #include <linux/mtd/mtd.h>
  33 #include <linux/mtd/map.h>
  34 #include <linux/mtd/partitions.h>
  35
  36
  37 /*
  38 ** The single, 16 megabyte flash bank is divided into four virtual
  39 ** partitions.  The first partition is 768 KiB and is intended to
  40 ** store the kernel image loaded by the bootstrap loader.  The second
  41 ** partition is 256 KiB and holds the BIOS image.  The third
  42 ** partition is 14.5 MiB and is intended for the flash file system
  43 ** image.  The last partition is 512 KiB and contains another copy
  44 ** of the BIOS image and the reset vector.
  45 **
  46 ** Only the third partition should be mounted.  The first partition
  47 ** should not be mounted, but it can erased and written to using the
  48 ** MTD character routines.  The second and fourth partitions should
  49 ** not be touched - it is possible to corrupt the BIOS image by
  50 ** mounting these partitions, and potentially the board will not be
  51 ** recoverable afterwards.
  52 */
  53
  54 /* partition_info gives details on the logical partitions that the split the
  55  * single flash device into. If the size if zero we use up to the end of the
  56  * device. */
  57 static struct mtd_partition partition_info[]={
  58     {
  59             .name = "NetSc520 boot kernel",
  60             .offset = 0,
  61             .size = 0xc0000
  62     },
  63     {
  64             .name = "NetSc520 Low BIOS",
  65             .offset = 0xc0000,
  66             .size = 0x40000
  67     },
  68     {
  69             .name = "NetSc520 file system",
  70             .offset = 0x100000,
  71             .size = 0xe80000
  72     },
  73     {
  74             .name = "NetSc520 High BIOS",
  75             .offset = 0xf80000,
  76             .size = 0x80000
  77     },
  78 };
  79 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
  80
  81 #define WINDOW_SIZE     0x00100000
  82 #define WINDOW_ADDR     0x00200000
  83
  84 static struct map_info netsc520_map = {
  85         .name = "netsc520 Flash Bank",
  86         .size = WINDOW_SIZE,
  87         .bankwidth = 4,
  88         .phys = WINDOW_ADDR,
  89 };
  90
  91 #define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map)
  92
  93 static struct mtd_info *mymtd;
  94
  95 static int __init init_netsc520(void)
  96 {
  97         printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
  98                         (unsigned long long)netsc520_map.size,
  99                         (unsigned long long)netsc520_map.phys);
 100         netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size);
 101
 102         if (!netsc520_map.virt) {
 103                 printk("Failed to ioremap_nocache\n");
 104                 return -EIO;
 105         }
 106
 107         simple_map_init(&netsc520_map);
 108
 109         mymtd = do_map_probe("cfi_probe", &netsc520_map);
 110         if(!mymtd)
 111                 mymtd = do_map_probe("map_ram", &netsc520_map);
 112         if(!mymtd)
 113                 mymtd = do_map_probe("map_rom", &netsc520_map);
 114
 115         if (!mymtd) {
 116                 iounmap(netsc520_map.virt);
 117                 return -ENXIO;
 118         }
 119
 120         mymtd->owner = THIS_MODULE;
 121         add_mtd_partitions( mymtd, partition_info, NUM_PARTITIONS );
 122         return 0;
 123 }
 124
 125 static void __exit cleanup_netsc520(void)
 126 {
 127         if (mymtd) {
 128                 del_mtd_partitions(mymtd);
 129                 map_destroy(mymtd);
 130         }
 131         if (netsc520_map.virt) {
 132                 iounmap(netsc520_map.virt);
 133                 netsc520_map.virt = NULL;
 134         }
 135 }
 136
 137 module_init(init_netsc520);
 138 module_exit(cleanup_netsc520);
 139
 140 MODULE_LICENSE("GPL");
 141 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
 142 MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");