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/*

 *  drivers/mtd/autcpu12.c

 *

 *  Copyright (c) 2002 Thomas Gleixner <tgxl@linutronix.de>

 *

 *  Derived from drivers/mtd/spia.c

 *       Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)

 *

 * $Id: autcpu12.c,v 1.23 2005/11/07 11:14:30 gleixner 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

 *   autronix autcpu12 board, which is a SmartMediaCard. It supports

 *   16MiB, 32MiB and 64MiB cards.

 *

 *

 *      02-12-2002 TG   Cleanup of module params

 *

 *      02-20-2002 TG   adjusted for different rd/wr adress support

 *                      added support for read device ready/busy line

 *                      added page_cache

 *

 *      10-06-2002 TG   128K card support added

 */

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/module.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/arch/autcpu12.h>

/*

 * MTD structure for AUTCPU12 board

 */

static struct mtd_info *autcpu12_mtd = NULL;

static void __iomem *autcpu12_fio_base;

/*

 * Define partitions for flash devices

 */

static struct mtd_partition partition_info16k[] = {

        { .name         = "AUTCPU12 flash partition 1",

          .offset       = 0,

          .size         = 8 * SZ_1M },

        { .name         = "AUTCPU12 flash partition 2",

          .offset       = 8 * SZ_1M,

          .size         = 8 * SZ_1M },

};

static struct mtd_partition partition_info32k[] = {

        { .name         = "AUTCPU12 flash partition 1",

          .offset       = 0,

          .size         = 8 * SZ_1M },

        { .name         = "AUTCPU12 flash partition 2",

          .offset       = 8 * SZ_1M,

          .size         = 24 * SZ_1M },

};

static struct mtd_partition partition_info64k[] = {

        { .name         = "AUTCPU12 flash partition 1",

          .offset       = 0,

          .size         = 16 * SZ_1M },

        { .name         = "AUTCPU12 flash partition 2",

          .offset       = 16 * SZ_1M,

          .size         = 48 * SZ_1M },

};

static struct mtd_partition partition_info128k[] = {

        { .name         = "AUTCPU12 flash partition 1",

          .offset       = 0,

          .size         = 16 * SZ_1M },

        { .name         = "AUTCPU12 flash partition 2",

          .offset       = 16 * SZ_1M,

          .size         = 112 * SZ_1M },

};

#define NUM_PARTITIONS16K 2

#define NUM_PARTITIONS32K 2

#define NUM_PARTITIONS64K 2

#define NUM_PARTITIONS128K 2

/*

 *      hardware specific access to control-lines

 *

 *      ALE bit 4 autcpu12_pedr

 *      CLE bit 5 autcpu12_pedr

 *      NCE bit 0 fio_ctrl

 *

 */

static void autcpu12_hwcontrol(struct mtd_info *mtd, int cmd,

                               unsigned int ctrl)

{

        struct nand_chip *chip = mtd->priv;

        if (ctrl & NAND_CTRL_CHANGE) {

                void __iomem *addr;

                unsigned char bits;

                addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;

                bits = (ctrl & NAND_CLE) << 4;

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

                writeb((readb(addr) & ~0x30) | bits, addr);

                addr = autcpu12_fio_base + AUTCPU12_SMC_SELECT_OFFSET;

                writeb((readb(addr) & ~0x1) | (ctrl & NAND_NCE), addr);

        }

        if (cmd != NAND_CMD_NONE)

                writeb(cmd, chip->IO_ADDR_W);

}

/*

 *      read device ready pin

 */

int autcpu12_device_ready(struct mtd_info *mtd)

{

        void __iomem *addr = CS89712_VIRT_BASE + AUTCPU12_SMC_PORT_OFFSET;

        return readb(addr) & AUTCPU12_SMC_RDY;

}

/*

 * Main initialization routine

 */

static int __init autcpu12_init(void)

{

        struct nand_chip *this;

        int err = 0;

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

        autcpu12_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip),

                               GFP_KERNEL);

        if (!autcpu12_mtd) {

                printk("Unable to allocate AUTCPU12 NAND MTD device structure.\n");

                err = -ENOMEM;

                goto out;

        }

        /* map physical adress */

        autcpu12_fio_base = ioremap(AUTCPU12_PHYS_SMC, SZ_1K);

        if (!autcpu12_fio_base) {

                printk("Ioremap autcpu12 SmartMedia Card failed\n");

                err = -EIO;

                goto out_mtd;

        }

        /* Get pointer to private data */

        this = (struct nand_chip *)(&autcpu12_mtd[1]);

        /* Initialize structures */

        memset(autcpu12_mtd, 0, sizeof(struct mtd_info));

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

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

        autcpu12_mtd->priv = this;

        autcpu12_mtd->owner = THIS_MODULE;

        /* Set address of NAND IO lines */

        this->IO_ADDR_R = autcpu12_fio_base;

        this->IO_ADDR_W = autcpu12_fio_base;

        this->cmd_ctrl = autcpu12_hwcontrol;

        this->dev_ready = autcpu12_device_ready;

        /* 20 us command delay time */

        this->chip_delay = 20;

        this->ecc.mode = NAND_ECC_SOFT;

        /* Enable the following for a flash based bad block table */

        /*

           this->options = NAND_USE_FLASH_BBT;

         */

        this->options = NAND_USE_FLASH_BBT;

        /* Scan to find existance of the device */

        if (nand_scan(autcpu12_mtd, 1)) {

                err = -ENXIO;

                goto out_ior;

        }

        /* Register the partitions */

        switch (autcpu12_mtd->size) {

                case SZ_16M:

                        add_mtd_partitions(autcpu12_mtd, partition_info16k,

                                           NUM_PARTITIONS16K);

                        break;

                case SZ_32M:

                        add_mtd_partitions(autcpu12_mtd, partition_info32k,

                                           NUM_PARTITIONS32K);

                        break;

                case SZ_64M:

                        add_mtd_partitions(autcpu12_mtd, partition_info64k,

                                           NUM_PARTITIONS64K);

                        break;

                case SZ_128M:

                        add_mtd_partitions(autcpu12_mtd, partition_info128k,

                                           NUM_PARTITIONS128K);

                        break;

                default:

                        printk("Unsupported SmartMedia device\n");

                        err = -ENXIO;

                        goto out_ior;

        }

        goto out;

 out_ior:

        iounmap(autcpu12_fio_base);

 out_mtd:

        kfree(autcpu12_mtd);

 out:

        return err;

}

module_init(autcpu12_init);

/*

 * Clean up routine

 */

static void __exit autcpu12_cleanup(void)

{

        /* Release resources, unregister device */

        nand_release(autcpu12_mtd);

        /* unmap physical adress */

        iounmap(autcpu12_fio_base);

        /* Free the MTD device structure */

        kfree(autcpu12_mtd);

}

module_exit(autcpu12_cleanup);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");

MODULE_DESCRIPTION("Glue layer for SmartMediaCard on autronix autcpu12");