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/*

 * drivers/mtd/nand/ts7250.c

 *

 * Copyright (C) 2004 Technologic Systems (support@embeddedARM.com)

 *

 * Derived from drivers/mtd/nand/edb7312.c

 *   Copyright (C) 2004 Marius Gröger (mag@sysgo.de)

 *

 * Derived from drivers/mtd/nand/autcpu12.c

 *   Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)

 *

 * $Id: ts7250.c,v 1.4 2004/12/30 22:02:07 joff Exp $

 *

 * 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.

 *

 * Overview:

 *   This is a device driver for the NAND flash device found on the

 *   TS-7250 board which utilizes a Samsung 32 Mbyte part.

 */

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/nand.h>

#include <linux/mtd/partitions.h>

#include <asm/io.h>

#include <asm/arch/hardware.h>

#include <asm/sizes.h>

#include <asm/mach-types.h>

/*

 * MTD structure for TS7250 board

 */

static struct mtd_info *ts7250_mtd = NULL;

#ifdef CONFIG_MTD_PARTITIONS

static const char *part_probes[] = { "cmdlinepart", NULL };

#define NUM_PARTITIONS 3

/*

 * Define static partitions for flash device

 */

static struct mtd_partition partition_info32[] = {

        {

                .name           = "TS-BOOTROM",

                .offset         = 0x00000000,

                .size           = 0x00004000,

        }, {

                .name           = "Linux",

                .offset         = 0x00004000,

                .size           = 0x01d00000,

        }, {

                .name           = "RedBoot",

                .offset         = 0x01d04000,

                .size           = 0x002fc000,

        },

};

/*

 * Define static partitions for flash device

 */

static struct mtd_partition partition_info128[] = {

        {

                .name           = "TS-BOOTROM",

                .offset         = 0x00000000,

                .size           = 0x00004000,

        }, {

                .name           = "Linux",

                .offset         = 0x00004000,

                .size           = 0x07d00000,

        }, {

                .name           = "RedBoot",

                .offset         = 0x07d04000,

                .size           = 0x002fc000,

        },

};

#endif

/*

 *      hardware specific access to control-lines

 *

 *      ctrl:

 *      NAND_NCE: bit 0 -> bit 2

 *      NAND_CLE: bit 1 -> bit 1

 *      NAND_ALE: bit 2 -> bit 0

 */

static void ts7250_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)

{

        struct nand_chip *chip = mtd->priv;

        if (ctrl & NAND_CTRL_CHANGE) {

                unsigned long addr = TS72XX_NAND_CONTROL_VIRT_BASE;

                unsigned char bits;

                bits = (ctrl & NAND_NCE) << 2;

                bits |= ctrl & NAND_CLE;

                bits |= (ctrl & NAND_ALE) >> 2;

                __raw_writeb((__raw_readb(addr) & ~0x7) | bits, addr);

        }

        if (cmd != NAND_CMD_NONE)

                writeb(cmd, chip->IO_ADDR_W);

}

/*

 *      read device ready pin

 */

static int ts7250_device_ready(struct mtd_info *mtd)

{

        return __raw_readb(TS72XX_NAND_BUSY_VIRT_BASE) & 0x20;

}

/*

 * Main initialization routine

 */

static int __init ts7250_init(void)

{

        struct nand_chip *this;

        const char *part_type = 0;

        int mtd_parts_nb = 0;

        struct mtd_partition *mtd_parts = 0;

        if (!machine_is_ts72xx() || board_is_ts7200())

                return -ENXIO;

        /* Allocate memory for MTD device structure and private data */

        ts7250_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);

        if (!ts7250_mtd) {

                printk("Unable to allocate TS7250 NAND MTD device structure.\n");

                return -ENOMEM;

        }

        /* Get pointer to private data */

        this = (struct nand_chip *)(&ts7250_mtd[1]);

        /* Initialize structures */

        memset(ts7250_mtd, 0, sizeof(struct mtd_info));

        memset(this, 0, sizeof(struct nand_chip));

        /* Link the private data with the MTD structure */

        ts7250_mtd->priv = this;

        ts7250_mtd->owner = THIS_MODULE;

        /* insert callbacks */

        this->IO_ADDR_R = (void *)TS72XX_NAND_DATA_VIRT_BASE;

        this->IO_ADDR_W = (void *)TS72XX_NAND_DATA_VIRT_BASE;

        this->cmd_ctrl = ts7250_hwcontrol;

        this->dev_ready = ts7250_device_ready;

        this->chip_delay = 15;

        this->ecc.mode = NAND_ECC_SOFT;

        printk("Searching for NAND flash...\n");

        /* Scan to find existence of the device */

        if (nand_scan(ts7250_mtd, 1)) {

                kfree(ts7250_mtd);

                return -ENXIO;

        }

#ifdef CONFIG_MTD_PARTITIONS

        ts7250_mtd->name = "ts7250-nand";

        mtd_parts_nb = parse_mtd_partitions(ts7250_mtd, part_probes, &mtd_parts, 0);

        if (mtd_parts_nb > 0)

                part_type = "command line";

        else

                mtd_parts_nb = 0;

#endif

        if (mtd_parts_nb == 0) {

                mtd_parts = partition_info32;

                if (ts7250_mtd->size >= (128 * 0x100000))

                        mtd_parts = partition_info128;

                mtd_parts_nb = NUM_PARTITIONS;

                part_type = "static";

        }

        /* Register the partitions */

        printk(KERN_NOTICE "Using %s partition definition\n", part_type);

        add_mtd_partitions(ts7250_mtd, mtd_parts, mtd_parts_nb);

        /* Return happy */

        return 0;

}

module_init(ts7250_init);

/*

 * Clean up routine

 */

static void __exit ts7250_cleanup(void)

{

        /* Unregister the device */

        del_mtd_device(ts7250_mtd);

        /* Free the MTD device structure */

        kfree(ts7250_mtd);

}

module_exit(ts7250_cleanup);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Jesse Off <joff@embeddedARM.com>");

MODULE_DESCRIPTION("MTD map driver for Technologic Systems TS-7250 board");