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/* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board

 *

 * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com)

 *      based on sc520cdp.c by Sysgo Real-Time Solutions GmbH

 *

 * $Id: netsc520.c,v 1.1.1.1 2004-04-15 01:51:56 phoenix Exp $

 *

 * 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 <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.

*/

static __u8 netsc520_read8(struct map_info *map, unsigned long ofs)

{

        return readb(map->map_priv_1 + ofs);

}

static __u16 netsc520_read16(struct map_info *map, unsigned long ofs)

{

        return readw(map->map_priv_1 + ofs);

}

static __u32 netsc520_read32(struct map_info *map, unsigned long ofs)

{

        return readl(map->map_priv_1 + ofs);

}

static void netsc520_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)

{

        memcpy_fromio(to, (void *)(map->map_priv_1 + from), len);

}

static void netsc520_write8(struct map_info *map, __u8 d, unsigned long adr)

{

        writeb(d, map->map_priv_1 + adr);

}

static void netsc520_write16(struct map_info *map, __u16 d, unsigned long adr)

{

        writew(d, map->map_priv_1 + adr);

}

static void netsc520_write32(struct map_info *map, __u32 d, unsigned long adr)

{

        writel(d, map->map_priv_1 + adr);

}

static void netsc520_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)

{

        memcpy_toio((void *)(map->map_priv_1 + to), from, len);

}

/* 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 (sizeof(partition_info)/sizeof(partition_info[0]))

/*

 * If no idea what is going on here.  This is taken from the FlashFX stuff.

 */

#define ROMCS 1

#define WINDOW_SIZE     0x00100000

#define WINDOW_ADDR     0x00200000

static struct map_info netsc520_map = {

        name: "netsc520 Flash Bank",

        size: WINDOW_SIZE,

        buswidth: 4,

        read8: netsc520_read8,

        read16: netsc520_read16,

        read32: netsc520_read32,

        copy_from: netsc520_copy_from,

        write8: netsc520_write8,

        write16: netsc520_write16,

        write32: netsc520_write32,

        copy_to: netsc520_copy_to,

        map_priv_2: WINDOW_ADDR

};

#define NUM_FLASH_BANKS (sizeof(netsc520_map)/sizeof(struct map_info))

static struct mtd_info *mymtd;

static int __init init_netsc520(void)

{

        printk(KERN_NOTICE "NetSc520 flash device: %lx at %lx\n", netsc520_map.size, netsc520_map.map_priv_2);

        netsc520_map.map_priv_1 = (unsigned long)ioremap_nocache(netsc520_map.map_priv_2, netsc520_map.size);

        if (!netsc520_map.map_priv_1) {

                printk("Failed to ioremap_nocache\n");

                return -EIO;

        }

        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((void *)netsc520_map.map_priv_1);

                return -ENXIO;

        }

        mymtd->module = THIS_MODULE;

        add_mtd_partitions( mymtd, partition_info, NUM_PARTITIONS );

        return 0;

}

static void __exit cleanup_netsc520(void)

{

        if (mymtd) {

                del_mtd_partitions(mymtd);

                map_destroy(mymtd);

        }

        if (netsc520_map.map_priv_1) {

                iounmap((void *)netsc520_map.map_priv_1);

                netsc520_map.map_priv_1 = 0;

        }

}

module_init(init_netsc520);

module_exit(cleanup_netsc520);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");

MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");