mbx860.c

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/*
 * Handle mapping of the flash on MBX860 boards
 *
 * Author:  Anton Todorov
 * Copyright:   (C) 2001 Emness Technology
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#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>


#define WINDOW_ADDR 0xfe000000
#define WINDOW_SIZE 0x00200000

/* Flash / Partition sizing */
#define MAX_SIZE_KiB              8192
#define BOOT_PARTITION_SIZE_KiB    512
#define KERNEL_PARTITION_SIZE_KiB 5632
#define APP_PARTITION_SIZE_KiB    2048

#define NUM_PARTITIONS 3

/* 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 = "MBX flash BOOT partition",
    .offset = 0,
    .size =   BOOT_PARTITION_SIZE_KiB*1024 },
    { .name = "MBX flash DATA partition",
    .offset = BOOT_PARTITION_SIZE_KiB*1024,
    .size = (KERNEL_PARTITION_SIZE_KiB)*1024 },
    { .name = "MBX flash APPLICATION partition",
    .offset = (BOOT_PARTITION_SIZE_KiB+KERNEL_PARTITION_SIZE_KiB)*1024 }
};


static struct mtd_info *mymtd;

struct map_info mbx_map = {
    .name = "MBX flash",
    .size = WINDOW_SIZE,
    .phys = WINDOW_ADDR,
    .bankwidth = 4,
};

static int __init init_mbx(void)
{
    printk(KERN_NOTICE "Motorola MBX flash device: 0x%x at 0x%x\n", WINDOW_SIZE*4, WINDOW_ADDR);
    mbx_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE * 4);

    if (!mbx_map.virt) {
        printk("Failed to ioremap\n");
        return -EIO;
    }
    simple_map_init(&mbx_map);

    mymtd = do_map_probe("jedec_probe", &mbx_map);
    if (mymtd) {
        mymtd->owner = THIS_MODULE;
        mtd_device_register(mymtd, NULL, 0);
        mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
        return 0;
    }

    iounmap((void *)mbx_map.virt);
    return -ENXIO;
}

static void __exit cleanup_mbx(void)
{
    if (mymtd) {
        mtd_device_unregister(mymtd);
        map_destroy(mymtd);
    }
    if (mbx_map.virt) {
        iounmap((void *)mbx_map.virt);
        mbx_map.virt = 0;
    }
}

module_init(init_mbx);
module_exit(cleanup_mbx);

MODULE_AUTHOR("Anton Todorov <[email protected]>");
MODULE_DESCRIPTION("MTD map driver for Motorola MBX860 board");
MODULE_LICENSE("GPL");