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/*

 *  drivers/mtd/nand/h1910.c

 *

 *  Copyright (C) 2003 Joshua Wise (joshua@joshuawise.com)

 *

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

 *       Copyright (C) 2002 Marius Gröger (mag@sysgo.de)

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

 *

 * $Id: h1910.c,v 1.6 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

 *   iPAQ h1910 board which utilizes the Samsung K9F2808 part. This is

 *   a 128Mibit (16MiB x 8 bits) NAND flash device.

 */

#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>  /* for CLPS7111_VIRT_BASE */

#include <asm/sizes.h>

#include <asm/arch/h1900-gpio.h>

#include <asm/arch/ipaq.h>

/*

 * MTD structure for EDB7312 board

 */

static struct mtd_info *h1910_nand_mtd = NULL;

/*

 * Module stuff

 */

#ifdef CONFIG_MTD_PARTITIONS

/*

 * Define static partitions for flash device

 */

static struct mtd_partition partition_info[] = {

      {name:"h1910 NAND Flash",

              offset:0,

      size:16 * 1024 * 1024}

};

#define NUM_PARTITIONS 1

#endif

/*

 *      hardware specific access to control-lines

 *

 *      NAND_NCE: bit 0 - don't care

 *      NAND_CLE: bit 1 - address bit 2

 *      NAND_ALE: bit 2 - address bit 3

 */

static void h1910_hwcontrol(struct mtd_info *mtd, int cmd,

                            unsigned int ctrl)

{

        struct nand_chip *chip = mtd->priv;

        if (cmd != NAND_CMD_NONE)

                writeb(cmd, chip->IO_ADDR_W | ((ctrl & 0x6) << 1));

}

/*

 *      read device ready pin

 */

#if 0

static int h1910_device_ready(struct mtd_info *mtd)

{

        return (GPLR(55) & GPIO_bit(55));

}

#endif

/*

 * Main initialization routine

 */

static int __init h1910_init(void)

{

        struct nand_chip *this;

        const char *part_type = 0;

        int mtd_parts_nb = 0;

        struct mtd_partition *mtd_parts = 0;

        void __iomem *nandaddr;

        if (!machine_is_h1900())

                return -ENODEV;

        nandaddr = ioremap(0x08000000, 0x1000);

        if (!nandaddr) {

                printk("Failed to ioremap nand flash.\n");

                return -ENOMEM;

        }

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

        h1910_nand_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);

        if (!h1910_nand_mtd) {

                printk("Unable to allocate h1910 NAND MTD device structure.\n");

                iounmap((void *)nandaddr);

                return -ENOMEM;

        }

        /* Get pointer to private data */

        this = (struct nand_chip *)(&h1910_nand_mtd[1]);

        /* Initialize structures */

        memset(h1910_nand_mtd, 0, sizeof(struct mtd_info));

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

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

        h1910_nand_mtd->priv = this;

        h1910_nand_mtd->owner = THIS_MODULE;

        /*

         * Enable VPEN

         */

        GPSR(37) = GPIO_bit(37);

        /* insert callbacks */

        this->IO_ADDR_R = nandaddr;

        this->IO_ADDR_W = nandaddr;

        this->cmd_ctrl = h1910_hwcontrol;

        this->dev_ready = NULL; /* unknown whether that was correct or not so we will just do it like this */

        /* 15 us command delay time */

        this->chip_delay = 50;

        this->ecc.mode = NAND_ECC_SOFT;

        this->options = NAND_NO_AUTOINCR;

        /* Scan to find existence of the device */

        if (nand_scan(h1910_nand_mtd, 1)) {

                printk(KERN_NOTICE "No NAND device - returning -ENXIO\n");

                kfree(h1910_nand_mtd);

                iounmap((void *)nandaddr);

                return -ENXIO;

        }

#ifdef CONFIG_MTD_CMDLINE_PARTS

        mtd_parts_nb = parse_cmdline_partitions(h1910_nand_mtd, &mtd_parts, "h1910-nand");

        if (mtd_parts_nb > 0)

                part_type = "command line";

        else

                mtd_parts_nb = 0;

#endif

        if (mtd_parts_nb == 0) {

                mtd_parts = partition_info;

                mtd_parts_nb = NUM_PARTITIONS;

                part_type = "static";

        }

        /* Register the partitions */

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

        add_mtd_partitions(h1910_nand_mtd, mtd_parts, mtd_parts_nb);

        /* Return happy */

        return 0;

}

module_init(h1910_init);

/*

 * Clean up routine

 */

static void __exit h1910_cleanup(void)

{

        struct nand_chip *this = (struct nand_chip *)&h1910_nand_mtd[1];

        /* Release resources, unregister device */

        nand_release(h1910_nand_mtd);

        /* Release io resource */

        iounmap((void *)this->IO_ADDR_W);

        /* Free the MTD device structure */

        kfree(h1910_nand_mtd);

}

module_exit(h1910_cleanup);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Joshua Wise <joshua at joshuawise dot com>");

MODULE_DESCRIPTION("NAND flash driver for iPAQ h1910");