netsc520.c

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/* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board
 *
 * Copyright (C) 2001 Mark Langsdorf ([email protected])
 *  based on sc520cdp.c by Sysgo Real-Time Solutions GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 *
 * The NetSc520 is a demonstration board for the Elan Sc520 processor available
 * from AMD.  It has a single back of 16 megs of 32-bit Flash ROM and another
 * 16 megs of SDRAM.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>


/*
** The single, 16 megabyte flash bank is divided into four virtual
** partitions.  The first partition is 768 KiB and is intended to
** store the kernel image loaded by the bootstrap loader.  The second
** partition is 256 KiB and holds the BIOS image.  The third
** partition is 14.5 MiB and is intended for the flash file system
** image.  The last partition is 512 KiB and contains another copy
** of the BIOS image and the reset vector.
**
** Only the third partition should be mounted.  The first partition
** should not be mounted, but it can erased and written to using the
** MTD character routines.  The second and fourth partitions should
** not be touched - it is possible to corrupt the BIOS image by
** mounting these partitions, and potentially the board will not be
** recoverable afterwards.
*/

/* partition_info gives details on the logical partitions that the split the
 * single flash device into. If the size if zero we use up to the end of the
 * device. */
static struct mtd_partition partition_info[]={
    {
        .name = "NetSc520 boot kernel",
        .offset = 0,
        .size = 0xc0000
    },
    {
        .name = "NetSc520 Low BIOS",
        .offset = 0xc0000,
        .size = 0x40000
    },
    {
        .name = "NetSc520 file system",
        .offset = 0x100000,
        .size = 0xe80000
    },
    {
        .name = "NetSc520 High BIOS",
        .offset = 0xf80000,
        .size = 0x80000
    },
};
#define NUM_PARTITIONS ARRAY_SIZE(partition_info)

#define WINDOW_SIZE 0x00100000
#define WINDOW_ADDR 0x00200000

static struct map_info netsc520_map = {
    .name = "netsc520 Flash Bank",
    .size = WINDOW_SIZE,
    .bankwidth = 4,
    .phys = WINDOW_ADDR,
};

#define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map)

static struct mtd_info *mymtd;

static int __init init_netsc520(void)
{
    printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
            (unsigned long long)netsc520_map.size,
            (unsigned long long)netsc520_map.phys);
    netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size);

    if (!netsc520_map.virt) {
        printk("Failed to ioremap_nocache\n");
        return -EIO;
    }

    simple_map_init(&netsc520_map);

    mymtd = do_map_probe("cfi_probe", &netsc520_map);
    if(!mymtd)
        mymtd = do_map_probe("map_ram", &netsc520_map);
    if(!mymtd)
        mymtd = do_map_probe("map_rom", &netsc520_map);

    if (!mymtd) {
        iounmap(netsc520_map.virt);
        return -ENXIO;
    }

    mymtd->owner = THIS_MODULE;
    mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
    return 0;
}

static void __exit cleanup_netsc520(void)
{
    if (mymtd) {
        mtd_device_unregister(mymtd);
        map_destroy(mymtd);
    }
    if (netsc520_map.virt) {
        iounmap(netsc520_map.virt);
        netsc520_map.virt = NULL;
    }
}

module_init(init_netsc520);
module_exit(cleanup_netsc520);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Langsdorf <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");