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  * 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  * The NetSc520 is a demonstration board for the Elan Sc520 processor available
  21  * from AMD.  It has a single back of 16 megs of 32-bit Flash ROM and another
  22  * 16 megs of SDRAM.
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/types.h>
  27 #include <linux/kernel.h>
  28 #include <linux/init.h>
  29 #include <asm/io.h>
  30 #include <linux/mtd/mtd.h>
  31 #include <linux/mtd/map.h>
  32 #include <linux/mtd/partitions.h>
  33
  34
  35 /*
  36 ** The single, 16 megabyte flash bank is divided into four virtual
  37 ** partitions.  The first partition is 768 KiB and is intended to
  38 ** store the kernel image loaded by the bootstrap loader.  The second
  39 ** partition is 256 KiB and holds the BIOS image.  The third
  40 ** partition is 14.5 MiB and is intended for the flash file system
  41 ** image.  The last partition is 512 KiB and contains another copy
  42 ** of the BIOS image and the reset vector.
  43 **
  44 ** Only the third partition should be mounted.  The first partition
  45 ** should not be mounted, but it can erased and written to using the
  46 ** MTD character routines.  The second and fourth partitions should
  47 ** not be touched - it is possible to corrupt the BIOS image by
  48 ** mounting these partitions, and potentially the board will not be
  49 ** recoverable afterwards.
  50 */
  51
  52 /* partition_info gives details on the logical partitions that the split the
  53  * single flash device into. If the size if zero we use up to the end of the
  54  * device. */
  55 static struct mtd_partition partition_info[]={
  56     {
  57             .name = "NetSc520 boot kernel",
  58             .offset = 0,
  59             .size = 0xc0000
  60     },
  61     {
  62             .name = "NetSc520 Low BIOS",
  63             .offset = 0xc0000,
  64             .size = 0x40000
  65     },
  66     {
  67             .name = "NetSc520 file system",
  68             .offset = 0x100000,
  69             .size = 0xe80000
  70     },
  71     {
  72             .name = "NetSc520 High BIOS",
  73             .offset = 0xf80000,
  74             .size = 0x80000
  75     },
  76 };
  77 #define NUM_PARTITIONS ARRAY_SIZE(partition_info)
  78
  79 #define WINDOW_SIZE     0x00100000
  80 #define WINDOW_ADDR     0x00200000
  81
  82 static struct map_info netsc520_map = {
  83         .name = "netsc520 Flash Bank",
  84         .size = WINDOW_SIZE,
  85         .bankwidth = 4,
  86         .phys = WINDOW_ADDR,
  87 };
  88
  89 #define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map)
  90
  91 static struct mtd_info *mymtd;
  92
  93 static int __init init_netsc520(void)
  94 {
  95         printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
  96                         (unsigned long long)netsc520_map.size,
  97                         (unsigned long long)netsc520_map.phys);
  98         netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size);
  99
 100         if (!netsc520_map.virt) {
 101                 printk("Failed to ioremap_nocache\n");
 102                 return -EIO;
 103         }
 104
 105         simple_map_init(&netsc520_map);
 106
 107         mymtd = do_map_probe("cfi_probe", &netsc520_map);
 108         if(!mymtd)
 109                 mymtd = do_map_probe("map_ram", &netsc520_map);
 110         if(!mymtd)
 111                 mymtd = do_map_probe("map_rom", &netsc520_map);
 112
 113         if (!mymtd) {
 114                 iounmap(netsc520_map.virt);
 115                 return -ENXIO;
 116         }
 117
 118         mymtd->owner = THIS_MODULE;
 119         mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
 120         return 0;
 121 }
 122
 123 static void __exit cleanup_netsc520(void)
 124 {
 125         if (mymtd) {
 126                 mtd_device_unregister(mymtd);
 127                 map_destroy(mymtd);
 128         }
 129         if (netsc520_map.virt) {
 130                 iounmap(netsc520_map.virt);
 131                 netsc520_map.virt = NULL;
 132         }
 133 }
 134
 135 module_init(init_netsc520);
 136 module_exit(cleanup_netsc520);
 137
 138 MODULE_LICENSE("GPL");
 139 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
 140 MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");