LXR linux/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. */
  55static 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
  82static 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
  91static struct mtd_info *mymtd;
  92
  93static 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
 123static 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
 135module_init(init_netsc520);
 136module_exit(cleanup_netsc520);
 137
 138MODULE_LICENSE("GPL");
 139MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
 140MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");
 141