h1910.c

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/*
 *  drivers/mtd/nand/h1910.c
 *
 *  Copyright (C) 2003 Joshua Wise ([email protected])
 *
 *  Derived from drivers/mtd/nand/edb7312.c
 *       Copyright (C) 2002 Marius Gröger ([email protected])
 *       Copyright (c) 2001 Thomas Gleixner ([email protected])
 *
 * 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 <mach/hardware.h>
#include <asm/sizes.h>
#include <mach/h1900-gpio.h>
#include <mach/ipaq.h>

/*
 * MTD structure for EDB7312 board
 */
static struct mtd_info *h1910_nand_mtd = NULL;

/*
 * Module stuff
 */

/*
 * 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

/*
 *  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;
    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;

    /* 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;
    }

    /* Register the partitions */
    mtd_device_parse_register(h1910_nand_mtd, NULL, NULL, partition_info,
                  NUM_PARTITIONS);

    /* 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");