ts5500_flash.c

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/*
 * ts5500_flash.c -- MTD map driver for Technology Systems TS-5500 board
 *
 * Copyright (C) 2004 Sean Young <[email protected]>
 *
 * 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
 *
 * Note:
 * - In order for detection to work, jumper 3 must be set.
 * - Drive A and B use the resident flash disk (RFD) flash translation layer.
 * - If you have created your own jffs file system and the bios overwrites
 *   it during boot, try disabling Drive A: and B: in the boot order.
 */

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


#define WINDOW_ADDR 0x09400000
#define WINDOW_SIZE 0x00200000

static struct map_info ts5500_map = {
    .name = "TS-5500 Flash",
    .size = WINDOW_SIZE,
    .bankwidth = 1,
    .phys = WINDOW_ADDR
};

static struct mtd_partition ts5500_partitions[] = {
    {
        .name = "Drive A",
        .offset = 0,
        .size = 0x0e0000
    },
    {
        .name = "BIOS",
        .offset = 0x0e0000,
        .size = 0x020000,
    },
    {
        .name = "Drive B",
        .offset = 0x100000,
        .size = 0x100000
    }
};

#define NUM_PARTITIONS ARRAY_SIZE(ts5500_partitions)

static struct mtd_info *mymtd;

static int __init init_ts5500_map(void)
{
    int rc = 0;

    ts5500_map.virt = ioremap_nocache(ts5500_map.phys, ts5500_map.size);

    if (!ts5500_map.virt) {
        printk(KERN_ERR "Failed to ioremap_nocache\n");
        rc = -EIO;
        goto err2;
    }

    simple_map_init(&ts5500_map);

    mymtd = do_map_probe("jedec_probe", &ts5500_map);
    if (!mymtd)
        mymtd = do_map_probe("map_rom", &ts5500_map);

    if (!mymtd) {
        rc = -ENXIO;
        goto err1;
    }

    mymtd->owner = THIS_MODULE;
    mtd_device_register(mymtd, ts5500_partitions, NUM_PARTITIONS);

    return 0;

err1:
    iounmap(ts5500_map.virt);
err2:
    return rc;
}

static void __exit cleanup_ts5500_map(void)
{
    if (mymtd) {
        mtd_device_unregister(mymtd);
        map_destroy(mymtd);
    }

    if (ts5500_map.virt) {
        iounmap(ts5500_map.virt);
        ts5500_map.virt = NULL;
    }
}

module_init(init_ts5500_map);
module_exit(cleanup_ts5500_map);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sean Young <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for Techology Systems TS-5500 board");