drivers/char/ps3flash.c - kernel/prism - Git at Google

 /*
  * 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/uaccess.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;

 	priv->tag = start_sector;
 	return 0;
 }

 static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
 {
 	struct ps3_storage_device *dev = ps3flash_dev;
 	loff_t res;

 	mutex_lock(&file->f_mapping->host->i_mutex);
 	switch (origin) {
 	case 1:
 		offset += file->f_pos;
 		break;
 	case 2:
 		offset += dev->regions[dev->region_idx].size*dev->blk_size;
 		break;
 	}
 	if (offset < 0) {
 		res = -EINVAL;
 		goto out;
 	}

 	file->f_pos = offset;
 	res = file->f_pos;

 out:
 	mutex_unlock(&file->f_mapping->host->i_mutex);
 	return res;
 }

 static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf,
 			     size_t count, loff_t *pos)
 {
 	struct ps3_storage_device *dev = ps3flash_dev;
 	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 	u64 size, sector, offset;
 	int res;
 	size_t remaining, n;
 	const void *src;

 	dev_dbg(&dev->sbd.core,
 		"%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n",
 		__func__, __LINE__, count, *pos, userbuf, kernelbuf);

 	size = dev->regions[dev->region_idx].size*dev->blk_size;
 	if (*pos >= size || !count)
 		return 0;

 	if (*pos + count > size) {
 		dev_dbg(&dev->sbd.core,
 			"%s:%u Truncating count from %zu to %llu\n", __func__,
 			__LINE__, count, size - *pos);
 		count = size - *pos;
 	}

 	sector = *pos / dev->bounce_size * priv->chunk_sectors;
 	offset = *pos % dev->bounce_size;

 	remaining = count;
 	do {
 		n = min_t(u64, remaining, dev->bounce_size - offset);
 		src = dev->bounce_buf + offset;

 		mutex_lock(&priv->mutex);

 		res = ps3flash_fetch(dev, sector);
 		if (res)
 			goto fail;

 		dev_dbg(&dev->sbd.core,
 			"%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n",
 			__func__, __LINE__, n, src, userbuf, kernelbuf);
 		if (userbuf) {
 			if (copy_to_user(userbuf, src, n)) {
 				res = -EFAULT;
 				goto fail;
 			}
 			userbuf += n;
 		}
 		if (kernelbuf) {
 			memcpy(kernelbuf, src, n);
 			kernelbuf += n;
 		}

 		mutex_unlock(&priv->mutex);

 		*pos += n;
 		remaining -= n;
 		sector += priv->chunk_sectors;
 		offset = 0;
 	} while (remaining > 0);

 	return count;

 fail:
 	mutex_unlock(&priv->mutex);
 	return res;
 }

 static ssize_t ps3flash_write(const char __user *userbuf,
 			      const void *kernelbuf, size_t count, loff_t *pos)
 {
 	struct ps3_storage_device *dev = ps3flash_dev;
 	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 	u64 size, sector, offset;
 	int res = 0;
 	size_t remaining, n;
 	void *dst;

 	dev_dbg(&dev->sbd.core,
 		"%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n",
 		__func__, __LINE__, count, *pos, userbuf, kernelbuf);

 	size = dev->regions[dev->region_idx].size*dev->blk_size;
 	if (*pos >= size || !count)
 		return 0;

 	if (*pos + count > size) {
 		dev_dbg(&dev->sbd.core,
 			"%s:%u Truncating count from %zu to %llu\n", __func__,
 			__LINE__, count, size - *pos);
 		count = size - *pos;
 	}

 	sector = *pos / dev->bounce_size * priv->chunk_sectors;
 	offset = *pos % dev->bounce_size;

 	remaining = count;
 	do {
 		n = min_t(u64, remaining, dev->bounce_size - offset);
 		dst = dev->bounce_buf + offset;

 		mutex_lock(&priv->mutex);

 		if (n != dev->bounce_size)
 			res = ps3flash_fetch(dev, sector);
 		else if (sector != priv->tag)
 			res = ps3flash_writeback(dev);
 		if (res)
 			goto fail;

 		dev_dbg(&dev->sbd.core,
 			"%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n",
 			__func__, __LINE__, n, userbuf, kernelbuf, dst);
 		if (userbuf) {
 			if (copy_from_user(dst, userbuf, n)) {
 				res = -EFAULT;
 				goto fail;
 			}
 			userbuf += n;
 		}
 		if (kernelbuf) {
 			memcpy(dst, kernelbuf, n);
 			kernelbuf += n;
 		}

 		priv->tag = sector;
 		priv->dirty = true;

 		mutex_unlock(&priv->mutex);

 		*pos += n;
 		remaining -= n;
 		sector += priv->chunk_sectors;
 		offset = 0;
 	} while (remaining > 0);

 	return count;

 fail:
 	mutex_unlock(&priv->mutex);
 	return res;
 }

 static ssize_t ps3flash_user_read(struct file *file, char __user *buf,
 				  size_t count, loff_t *pos)
 {
 	return ps3flash_read(buf, NULL, count, pos);
 }

 static ssize_t ps3flash_user_write(struct file *file, const char __user *buf,
 				   size_t count, loff_t *pos)
 {
 	return ps3flash_write(buf, NULL, count, pos);
 }

 static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos)
 {
 	return ps3flash_read(NULL, buf, count, &pos);
 }

 static ssize_t ps3flash_kernel_write(const void *buf, size_t count,
 				     loff_t pos)
 {
 	ssize_t res;
 	int wb;

 	res = ps3flash_write(NULL, buf, count, &pos);
 	if (res < 0)
 		return res;

 	/* Make kernel writes synchronous */
 	wb = ps3flash_writeback(ps3flash_dev);
 	if (wb)
 		return wb;

 	return res;
 }

 static int ps3flash_flush(struct file *file, fl_owner_t id)
 {
 	return ps3flash_writeback(ps3flash_dev);
 }

 static int ps3flash_fsync(struct file *file, struct dentry *dentry,
 			  int datasync)
 {
 	return ps3flash_writeback(ps3flash_dev);
 }

 static irqreturn_t ps3flash_interrupt(int irq, void *data)
 {
 	struct ps3_storage_device *dev = data;
 	int res;
 	u64 tag, status;

 	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);

 	if (tag != dev->tag)
 		dev_err(&dev->sbd.core,
 			"%s:%u: tag mismatch, got %llx, expected %llx\n",
 			__func__, __LINE__, tag, dev->tag);

 	if (res) {
 		dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
 			__func__, __LINE__, res, status);
 	} else {
 		dev->lv1_status = status;
 		complete(&dev->done);
 	}
 	return IRQ_HANDLED;
 }

 static const struct file_operations ps3flash_fops = {
 	.owner	= THIS_MODULE,
 	.llseek	= ps3flash_llseek,
 	.read	= ps3flash_user_read,
 	.write	= ps3flash_user_write,
 	.flush	= ps3flash_flush,
 	.fsync	= ps3flash_fsync,
 };

 static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = {
 	.read	= ps3flash_kernel_read,
 	.write	= ps3flash_kernel_write,
 };

 static struct miscdevice ps3flash_misc = {
 	.minor	= MISC_DYNAMIC_MINOR,
 	.name	= DEVICE_NAME,
 	.fops	= &ps3flash_fops,
 };

 static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
 {
 	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 	struct ps3flash_private *priv;
 	int error;
 	unsigned long tmp;

 	tmp = dev->regions[dev->region_idx].start*dev->blk_size;
 	if (tmp % FLASH_BLOCK_SIZE) {
 		dev_err(&dev->sbd.core,
 			"%s:%u region start %lu is not aligned\n", __func__,
 			__LINE__, tmp);
 		return -EINVAL;
 	}
 	tmp = dev->regions[dev->region_idx].size*dev->blk_size;
 	if (tmp % FLASH_BLOCK_SIZE) {
 		dev_err(&dev->sbd.core,
 			"%s:%u region size %lu is not aligned\n", __func__,
 			__LINE__, tmp);
 		return -EINVAL;
 	}

 	/* use static buffer, kmalloc cannot allocate 256 KiB */
 	if (!ps3flash_bounce_buffer.address)
 		return -ENODEV;

 	if (ps3flash_dev) {
 		dev_err(&dev->sbd.core,
 			"Only one FLASH device is supported\n");
 		return -EBUSY;
 	}

 	ps3flash_dev = dev;

 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv) {
 		error = -ENOMEM;
 		goto fail;
 	}

 	ps3_system_bus_set_drvdata(&dev->sbd, priv);
 	mutex_init(&priv->mutex);
 	priv->tag = -1;

 	dev->bounce_size = ps3flash_bounce_buffer.size;
 	dev->bounce_buf = ps3flash_bounce_buffer.address;
 	priv->chunk_sectors = dev->bounce_size / dev->blk_size;

 	error = ps3stor_setup(dev, ps3flash_interrupt);
 	if (error)
 		goto fail_free_priv;

 	ps3flash_misc.parent = &dev->sbd.core;
 	error = misc_register(&ps3flash_misc);
 	if (error) {
 		dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
 			__func__, __LINE__, error);
 		goto fail_teardown;
 	}

 	dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
 		 __func__, __LINE__, ps3flash_misc.minor);

 	ps3_os_area_flash_register(&ps3flash_kernel_ops);
 	return 0;

 fail_teardown:
 	ps3stor_teardown(dev);
 fail_free_priv:
 	kfree(priv);
 	ps3_system_bus_set_drvdata(&dev->sbd, NULL);
 fail:
 	ps3flash_dev = NULL;
 	return error;
 }

 static int ps3flash_remove(struct ps3_system_bus_device *_dev)
 {
 	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);

 	ps3_os_area_flash_register(NULL);
 	misc_deregister(&ps3flash_misc);
 	ps3stor_teardown(dev);
 	kfree(ps3_system_bus_get_drvdata(&dev->sbd));
 	ps3_system_bus_set_drvdata(&dev->sbd, NULL);
 	ps3flash_dev = NULL;
 	return 0;
 }


 static struct ps3_system_bus_driver ps3flash = {
 	.match_id	= PS3_MATCH_ID_STOR_FLASH,
 	.core.name	= DEVICE_NAME,
 	.core.owner	= THIS_MODULE,
 	.probe		= ps3flash_probe,
 	.remove		= ps3flash_remove,
 	.shutdown	= ps3flash_remove,
 };


 static int __init ps3flash_init(void)
 {
 	return ps3_system_bus_driver_register(&ps3flash);
 }

 static void __exit ps3flash_exit(void)
 {
 	ps3_system_bus_driver_unregister(&ps3flash);
 }

 module_init(ps3flash_init);
 module_exit(ps3flash_exit);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
 MODULE_AUTHOR("Sony Corporation");
 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);
	/*
	* 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/uaccess.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;

	priv->tag = start_sector;
	return 0;
	}

	static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
	{
	struct ps3_storage_device *dev = ps3flash_dev;
	loff_t res;

	mutex_lock(&file->f_mapping->host->i_mutex);
	switch (origin) {
	case 1:
	offset += file->f_pos;
	break;
	case 2:
	offset += dev->regions[dev->region_idx].size*dev->blk_size;
	break;
	}
	if (offset < 0) {
	res = -EINVAL;
	goto out;
	}

	file->f_pos = offset;
	res = file->f_pos;

	out:
	mutex_unlock(&file->f_mapping->host->i_mutex);
	return res;
	}

	static ssize_t ps3flash_read(char __user userbuf, void kernelbuf,
	size_t count, loff_t *pos)
	{
	struct ps3_storage_device *dev = ps3flash_dev;
	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	u64 size, sector, offset;
	int res;
	size_t remaining, n;
	const void *src;

	dev_dbg(&dev->sbd.core,
	"%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n",
	__func__, __LINE__, count, *pos, userbuf, kernelbuf);

	size = dev->regions[dev->region_idx].size*dev->blk_size;
	if (*pos >= size \|\| !count)
	return 0;

	if (*pos + count > size) {
	dev_dbg(&dev->sbd.core,
	"%s:%u Truncating count from %zu to %llu\n", __func__,
	__LINE__, count, size - *pos);
	count = size - *pos;
	}

	sector = pos / dev->bounce_size priv->chunk_sectors;
	offset = *pos % dev->bounce_size;

	remaining = count;
	do {
	n = min_t(u64, remaining, dev->bounce_size - offset);
	src = dev->bounce_buf + offset;

	mutex_lock(&priv->mutex);

	res = ps3flash_fetch(dev, sector);
	if (res)
	goto fail;

	dev_dbg(&dev->sbd.core,
	"%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n",
	__func__, __LINE__, n, src, userbuf, kernelbuf);
	if (userbuf) {
	if (copy_to_user(userbuf, src, n)) {
	res = -EFAULT;
	goto fail;
	}
	userbuf += n;
	}
	if (kernelbuf) {
	memcpy(kernelbuf, src, n);
	kernelbuf += n;
	}

	mutex_unlock(&priv->mutex);

	*pos += n;
	remaining -= n;
	sector += priv->chunk_sectors;
	offset = 0;
	} while (remaining > 0);

	return count;

	fail:
	mutex_unlock(&priv->mutex);
	return res;
	}

	static ssize_t ps3flash_write(const char __user *userbuf,
	const void kernelbuf, size_t count, loff_t pos)
	{
	struct ps3_storage_device *dev = ps3flash_dev;
	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	u64 size, sector, offset;
	int res = 0;
	size_t remaining, n;
	void *dst;

	dev_dbg(&dev->sbd.core,
	"%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n",
	__func__, __LINE__, count, *pos, userbuf, kernelbuf);

	size = dev->regions[dev->region_idx].size*dev->blk_size;
	if (*pos >= size \|\| !count)
	return 0;

	if (*pos + count > size) {
	dev_dbg(&dev->sbd.core,
	"%s:%u Truncating count from %zu to %llu\n", __func__,
	__LINE__, count, size - *pos);
	count = size - *pos;
	}

	sector = pos / dev->bounce_size priv->chunk_sectors;
	offset = *pos % dev->bounce_size;

	remaining = count;
	do {
	n = min_t(u64, remaining, dev->bounce_size - offset);
	dst = dev->bounce_buf + offset;

	mutex_lock(&priv->mutex);

	if (n != dev->bounce_size)
	res = ps3flash_fetch(dev, sector);
	else if (sector != priv->tag)
	res = ps3flash_writeback(dev);
	if (res)
	goto fail;

	dev_dbg(&dev->sbd.core,
	"%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n",
	__func__, __LINE__, n, userbuf, kernelbuf, dst);
	if (userbuf) {
	if (copy_from_user(dst, userbuf, n)) {
	res = -EFAULT;
	goto fail;
	}
	userbuf += n;
	}
	if (kernelbuf) {
	memcpy(dst, kernelbuf, n);
	kernelbuf += n;
	}

	priv->tag = sector;
	priv->dirty = true;

	mutex_unlock(&priv->mutex);

	*pos += n;
	remaining -= n;
	sector += priv->chunk_sectors;
	offset = 0;
	} while (remaining > 0);

	return count;

	fail:
	mutex_unlock(&priv->mutex);
	return res;
	}

	static ssize_t ps3flash_user_read(struct file file, char __user buf,
	size_t count, loff_t *pos)
	{
	return ps3flash_read(buf, NULL, count, pos);
	}

	static ssize_t ps3flash_user_write(struct file file, const char __user buf,
	size_t count, loff_t *pos)
	{
	return ps3flash_write(buf, NULL, count, pos);
	}

	static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos)
	{
	return ps3flash_read(NULL, buf, count, &pos);
	}

	static ssize_t ps3flash_kernel_write(const void *buf, size_t count,
	loff_t pos)
	{
	ssize_t res;
	int wb;

	res = ps3flash_write(NULL, buf, count, &pos);
	if (res < 0)
	return res;

	/* Make kernel writes synchronous */
	wb = ps3flash_writeback(ps3flash_dev);
	if (wb)
	return wb;

	return res;
	}

	static int ps3flash_flush(struct file *file, fl_owner_t id)
	{
	return ps3flash_writeback(ps3flash_dev);
	}

	static int ps3flash_fsync(struct file file, struct dentry dentry,
	int datasync)
	{
	return ps3flash_writeback(ps3flash_dev);
	}

	static irqreturn_t ps3flash_interrupt(int irq, void *data)
	{
	struct ps3_storage_device *dev = data;
	int res;
	u64 tag, status;

	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);

	if (tag != dev->tag)
	dev_err(&dev->sbd.core,
	"%s:%u: tag mismatch, got %llx, expected %llx\n",
	__func__, __LINE__, tag, dev->tag);

	if (res) {
	dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
	__func__, __LINE__, res, status);
	} else {
	dev->lv1_status = status;
	complete(&dev->done);
	}
	return IRQ_HANDLED;
	}

	static const struct file_operations ps3flash_fops = {
	.owner = THIS_MODULE,
	.llseek = ps3flash_llseek,
	.read = ps3flash_user_read,
	.write = ps3flash_user_write,
	.flush = ps3flash_flush,
	.fsync = ps3flash_fsync,
	};

	static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = {
	.read = ps3flash_kernel_read,
	.write = ps3flash_kernel_write,
	};

	static struct miscdevice ps3flash_misc = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = DEVICE_NAME,
	.fops = &ps3flash_fops,
	};

	static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
	{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	struct ps3flash_private *priv;
	int error;
	unsigned long tmp;

	tmp = dev->regions[dev->region_idx].start*dev->blk_size;
	if (tmp % FLASH_BLOCK_SIZE) {
	dev_err(&dev->sbd.core,
	"%s:%u region start %lu is not aligned\n", __func__,
	__LINE__, tmp);
	return -EINVAL;
	}
	tmp = dev->regions[dev->region_idx].size*dev->blk_size;
	if (tmp % FLASH_BLOCK_SIZE) {
	dev_err(&dev->sbd.core,
	"%s:%u region size %lu is not aligned\n", __func__,
	__LINE__, tmp);
	return -EINVAL;
	}

	/* use static buffer, kmalloc cannot allocate 256 KiB */
	if (!ps3flash_bounce_buffer.address)
	return -ENODEV;

	if (ps3flash_dev) {
	dev_err(&dev->sbd.core,
	"Only one FLASH device is supported\n");
	return -EBUSY;
	}

	ps3flash_dev = dev;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
	error = -ENOMEM;
	goto fail;
	}

	ps3_system_bus_set_drvdata(&dev->sbd, priv);
	mutex_init(&priv->mutex);
	priv->tag = -1;

	dev->bounce_size = ps3flash_bounce_buffer.size;
	dev->bounce_buf = ps3flash_bounce_buffer.address;
	priv->chunk_sectors = dev->bounce_size / dev->blk_size;

	error = ps3stor_setup(dev, ps3flash_interrupt);
	if (error)
	goto fail_free_priv;

	ps3flash_misc.parent = &dev->sbd.core;
	error = misc_register(&ps3flash_misc);
	if (error) {
	dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
	__func__, __LINE__, error);
	goto fail_teardown;
	}

	dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
	__func__, __LINE__, ps3flash_misc.minor);

	ps3_os_area_flash_register(&ps3flash_kernel_ops);
	return 0;

	fail_teardown:
	ps3stor_teardown(dev);
	fail_free_priv:
	kfree(priv);
	ps3_system_bus_set_drvdata(&dev->sbd, NULL);
	fail:
	ps3flash_dev = NULL;
	return error;
	}

	static int ps3flash_remove(struct ps3_system_bus_device *_dev)
	{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);

	ps3_os_area_flash_register(NULL);
	misc_deregister(&ps3flash_misc);
	ps3stor_teardown(dev);
	kfree(ps3_system_bus_get_drvdata(&dev->sbd));
	ps3_system_bus_set_drvdata(&dev->sbd, NULL);
	ps3flash_dev = NULL;
	return 0;
	}


	static struct ps3_system_bus_driver ps3flash = {
	.match_id = PS3_MATCH_ID_STOR_FLASH,
	.core.name = DEVICE_NAME,
	.core.owner = THIS_MODULE,
	.probe = ps3flash_probe,
	.remove = ps3flash_remove,
	.shutdown = ps3flash_remove,
	};


	static int __init ps3flash_init(void)
	{
	return ps3_system_bus_driver_register(&ps3flash);
	}

	static void __exit ps3flash_exit(void)
	{
	ps3_system_bus_driver_unregister(&ps3flash);
	}

	module_init(ps3flash_init);
	module_exit(ps3flash_exit);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
	MODULE_AUTHOR("Sony Corporation");
	MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);