Subversion Repositories test_project

/*

 *  drivers/mtd/nand/edb7312.c

 *

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

 *

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

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

 *

 * $Id: edb7312.c,v 1.12 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

 *   CLEP7312 board which utilizes the Toshiba TC58V64AFT part. This is

 *   a 64Mibit (8MiB x 8 bits) NAND flash device.

 */

#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>  /* for CLPS7111_VIRT_BASE */

#include <asm/sizes.h>

#include <asm/hardware/clps7111.h>

/*

 * MTD structure for EDB7312 board

 */

static struct mtd_info *ep7312_mtd = NULL;

/*

 * Values specific to the EDB7312 board (used with EP7312 processor)

 */

#define EP7312_FIO_PBASE 0x10000000     /* Phys address of flash */

#define EP7312_PXDR     0x0001  /*

                                 * IO offset to Port B data register

                                 * where the CLE, ALE and NCE pins

                                 * are wired to.

                                 */

#define EP7312_PXDDR    0x0041  /*

                                 * IO offset to Port B data direction

                                 * register so we can control the IO

                                 * lines.

                                 */

/*

 * Module stuff

 */

static unsigned long ep7312_fio_pbase = EP7312_FIO_PBASE;

static void __iomem *ep7312_pxdr = (void __iomem *)EP7312_PXDR;

static void __iomem *ep7312_pxddr = (void __iomem *)EP7312_PXDDR;

#ifdef CONFIG_MTD_PARTITIONS

/*

 * Define static partitions for flash device

 */

static struct mtd_partition partition_info[] = {

        {.name = "EP7312 Nand Flash",

         .offset = 0,

         .size = 8 * 1024 * 1024}

};

#define NUM_PARTITIONS 1

#endif

/*

 *      hardware specific access to control-lines

 *

 *      NAND_NCE: bit 0 -> bit 6 (bit 7 = 1)

 *      NAND_CLE: bit 1 -> bit 4

 *      NAND_ALE: bit 2 -> bit 5

 */

static void ep7312_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)

{

        struct nand_chip *chip = mtd->priv;

        if (ctrl & NAND_CTRL_CHANGE) {

                unsigned char bits = 0x80;

                bits |= (ctrl & (NAND_CLE | NAND_ALE)) << 3;

                bits |= (ctrl & NAND_NCE) ? 0x00 : 0x40;

                clps_writeb((clps_readb(ep7312_pxdr)  & 0xF0) | bits,

                            ep7312_pxdr);

        }

        if (cmd != NAND_CMD_NONE)

                writeb(cmd, chip->IO_ADDR_W);

}

/*

 *      read device ready pin

 */

static int ep7312_device_ready(struct mtd_info *mtd)

{

        return 1;

}

#ifdef CONFIG_MTD_PARTITIONS

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

#endif

/*

 * Main initialization routine

 */

static int __init ep7312_init(void)

{

        struct nand_chip *this;

        const char *part_type = 0;

        int mtd_parts_nb = 0;

        struct mtd_partition *mtd_parts = 0;

        void __iomem *ep7312_fio_base;

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

        ep7312_mtd = kmalloc(sizeof(struct mtd_info) + sizeof(struct nand_chip), GFP_KERNEL);

        if (!ep7312_mtd) {

                printk("Unable to allocate EDB7312 NAND MTD device structure.\n");

                return -ENOMEM;

        }

        /* map physical adress */

        ep7312_fio_base = ioremap(ep7312_fio_pbase, SZ_1K);

        if (!ep7312_fio_base) {

                printk("ioremap EDB7312 NAND flash failed\n");

                kfree(ep7312_mtd);

                return -EIO;

        }

        /* Get pointer to private data */

        this = (struct nand_chip *)(&ep7312_mtd[1]);

        /* Initialize structures */

        memset(ep7312_mtd, 0, sizeof(struct mtd_info));

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

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

        ep7312_mtd->priv = this;

        ep7312_mtd->owner = THIS_MODULE;

        /*

         * Set GPIO Port B control register so that the pins are configured

         * to be outputs for controlling the NAND flash.

         */

        clps_writeb(0xf0, ep7312_pxddr);

        /* insert callbacks */

        this->IO_ADDR_R = ep7312_fio_base;

        this->IO_ADDR_W = ep7312_fio_base;

        this->cmd_ctrl = ep7312_hwcontrol;

        this->dev_ready = ep7312_device_ready;

        /* 15 us command delay time */

        this->chip_delay = 15;

        /* Scan to find existence of the device */

        if (nand_scan(ep7312_mtd, 1)) {

                iounmap((void *)ep7312_fio_base);

                kfree(ep7312_mtd);

                return -ENXIO;

        }

#ifdef CONFIG_MTD_PARTITIONS

        ep7312_mtd->name = "edb7312-nand";

        mtd_parts_nb = parse_mtd_partitions(ep7312_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_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(ep7312_mtd, mtd_parts, mtd_parts_nb);

        /* Return happy */

        return 0;

}

module_init(ep7312_init);

/*

 * Clean up routine

 */

static void __exit ep7312_cleanup(void)

{

        struct nand_chip *this = (struct nand_chip *)&ep7312_mtd[1];

        /* Release resources, unregister device */

        nand_release(ap7312_mtd);

        /* Release io resource */

        iounmap(this->IO_ADDR_R);

        /* Free the MTD device structure */

        kfree(ep7312_mtd);

}

module_exit(ep7312_cleanup);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");

MODULE_DESCRIPTION("MTD map driver for Cogent EDB7312 board");