linux-imx

/*

 * PS3 FLASH ROM Storage Driver

 *

 * Copyright (C) 2007 Sony Computer Entertainment Inc.

 * Copyright 2007 Sony Corp.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published

 * by the Free Software Foundation; version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

​

#include <linux/fs.h>

#include <linux/miscdevice.h>

#include <linux/slab.h>

#include <linux/uaccess.h>

#include <linux/module.h>

​

#include <asm/lv1call.h>

#include <asm/ps3stor.h>

​

​

#define DEVICE_NAME     "ps3flash"

​

#define FLASH_BLOCK_SIZE    (256*1024)

​

​

struct ps3flash_private {

    struct mutex mutex; /* Bounce buffer mutex */

    u64 chunk_sectors;

    int tag;        /* Start sector of buffer, -1 if invalid */

    bool dirty;

};

​

static struct ps3_storage_device *ps3flash_dev;

​

static int ps3flash_read_write_sectors(struct ps3_storage_device *dev,

                       u64 start_sector, int write)

{

    struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);

    u64 res = ps3stor_read_write_sectors(dev, dev->bounce_lpar,

                         start_sector, priv->chunk_sectors,

                         write);

    if (res) {

        dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,

            __LINE__, write ? "write" : "read", res);

        return -EIO;

    }

    return 0;

}

​

static int ps3flash_writeback(struct ps3_storage_device *dev)

{

    struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);

    int res;

​

    if (!priv->dirty || priv->tag < 0)

        return 0;

​

    res = ps3flash_read_write_sectors(dev, priv->tag, 1);

    if (res)

        return res;

​

    priv->dirty = false;

    return 0;

}

​

static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector)

{

    struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);

    int res;

​

    if (start_sector == priv->tag)

        return 0;

​

    res = ps3flash_writeback(dev);

    if (res)

        return res;

​

    priv->tag = -1;

​

    res = ps3flash_read_write_sectors(dev, start_sector, 0);

    if (res)

        return res;