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/****************************************************************************/

/*

 *      uclinux.c -- generic memory mapped MTD driver for uclinux

 *

 *      (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)

 *

 *      $Id: uclinux.c,v 1.1.1.1 2004-04-15 01:51:45 phoenix Exp $

 */

/****************************************************************************/

#include <linux/config.h>

#include <linux/module.h>

#include <linux/types.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/fs.h>

#include <linux/major.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/map.h>

#include <linux/mtd/partitions.h>

#include <asm/io.h>

/****************************************************************************/

__u8 uclinux_read8(struct map_info *map, unsigned long ofs)

{

        return(*((__u8 *) (map->map_priv_1 + ofs)));

}

__u16 uclinux_read16(struct map_info *map, unsigned long ofs)

{

        return(*((__u16 *) (map->map_priv_1 + ofs)));

}

__u32 uclinux_read32(struct map_info *map, unsigned long ofs)

{

        return(*((__u32 *) (map->map_priv_1 + ofs)));

}

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

{

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

}

void uclinux_write8(struct map_info *map, __u8 d, unsigned long adr)

{

        *((__u8 *) (map->map_priv_1 + adr)) = d;

}

void uclinux_write16(struct map_info *map, __u16 d, unsigned long adr)

{

        *((__u16 *) (map->map_priv_1 + adr)) = d;

}

void uclinux_write32(struct map_info *map, __u32 d, unsigned long adr)

{

        *((__u32 *) (map->map_priv_1 + adr)) = d;

}

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

{

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

}

/****************************************************************************/

struct map_info uclinux_ram_map = {

        name:           "RAM",

        read8:          uclinux_read8,

        read16:         uclinux_read16,

        read32:         uclinux_read32,

        copy_from:      uclinux_copy_from,

        write8:         uclinux_write8,

        write16:        uclinux_write16,

        write32:        uclinux_write32,

        copy_to:        uclinux_copy_to,

};

struct mtd_info *uclinux_ram_mtdinfo;

/****************************************************************************/

struct mtd_partition uclinux_romfs[] = {

        { name: "ROMfs", offset: 0 }

};

#define NUM_PARTITIONS  (sizeof(uclinux_romfs) / sizeof(uclinux_romfs[0]))

/****************************************************************************/

int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,

        size_t *retlen, u_char **mtdbuf)

{

        struct map_info *map = (struct map_info *) mtd->priv;

        *mtdbuf = (u_char *) (map->map_priv_1 + ((int) from));

        *retlen = len;

        return(0);

}

/****************************************************************************/

int __init uclinux_mtd_init(void)

{

        struct mtd_info *mtd;

        struct map_info *mapp;

        extern char _ebss;

        mapp = &uclinux_ram_map;

        mapp->map_priv_2 = (unsigned long) &_ebss;

        mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8)));

        mapp->buswidth = 4;

        printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",

                (int) mapp->map_priv_2, (int) mapp->size);

        mapp->map_priv_1 = (unsigned long)

                ioremap_nocache(mapp->map_priv_2, mapp->size);

        if (mapp->map_priv_1 == 0) {

                printk("uclinux[mtd]: ioremap_nocache() failed\n");

                return(-EIO);

        }

        mtd = do_map_probe("map_ram", mapp);

        if (!mtd) {

                printk("uclinux[mtd]: failed to find a mapping?\n");

                iounmap((void *) mapp->map_priv_1);

                return(-ENXIO);

        }

        mtd->module = THIS_MODULE;

        mtd->point = uclinux_point;

        mtd->priv = mapp;

        uclinux_ram_mtdinfo = mtd;

        add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);

        printk("uclinux[mtd]: set %s to be root filesystem\n",

                uclinux_romfs[0].name);

        ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0);

        put_mtd_device(mtd);

        return(0);

}

/****************************************************************************/

void __exit uclinux_mtd_cleanup(void)

{

        if (uclinux_ram_mtdinfo) {

                del_mtd_partitions(uclinux_ram_mtdinfo);

                map_destroy(uclinux_ram_mtdinfo);

                uclinux_ram_mtdinfo = NULL;

        }

        if (uclinux_ram_map.map_priv_1) {

                iounmap((void *) uclinux_ram_map.map_priv_1);

                uclinux_ram_map.map_priv_1 = 0;

        }

}

/****************************************************************************/

module_init(uclinux_mtd_init);

module_exit(uclinux_mtd_cleanup);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");

MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");

/****************************************************************************/