drivers/char/ps3flash.c - fp2-dev/kernel/msm - Gitiles

 /*
  * 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 */
 };

 static struct ps3_storage_device *ps3flash_dev;

 static ssize_t ps3flash_read_write_sectors(struct ps3_storage_device *dev,
 					   u64 lpar, u64 start_sector,
 					   u64 sectors, int write)
 {
 	u64 res = ps3stor_read_write_sectors(dev, lpar, start_sector, sectors,
 					     write);
 	if (res) {
 		dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
 			__LINE__, write ? "write" : "read", res);
 		return -EIO;
 	}
 	return sectors;
 }

 static ssize_t ps3flash_read_sectors(struct ps3_storage_device *dev,
 				     u64 start_sector, u64 sectors,
 				     unsigned int sector_offset)
 {
 	u64 max_sectors, lpar;

 	max_sectors = dev->bounce_size / dev->blk_size;
 	if (sectors > max_sectors) {
 		dev_dbg(&dev->sbd.core, "%s:%u Limiting sectors to %lu\n",
 			__func__, __LINE__, max_sectors);
 		sectors = max_sectors;
 	}

 	lpar = dev->bounce_lpar + sector_offset * dev->blk_size;
 	return ps3flash_read_write_sectors(dev, lpar, start_sector, sectors,
 					   0);
 }

 static ssize_t ps3flash_write_chunk(struct ps3_storage_device *dev,
 				    u64 start_sector)
 {
        u64 sectors = dev->bounce_size / dev->blk_size;
        return ps3flash_read_write_sectors(dev, dev->bounce_lpar, start_sector,
 					  sectors, 1);
 }

 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(struct file *file, char __user *buf, size_t count,
 			     loff_t *pos)
 {
 	struct ps3_storage_device *dev = ps3flash_dev;
 	struct ps3flash_private *priv = dev->sbd.core.driver_data;
 	u64 size, start_sector, end_sector, offset;
 	ssize_t sectors_read;
 	size_t remaining, n;

 	dev_dbg(&dev->sbd.core,
 		"%s:%u: Reading %zu bytes at position %lld to user 0x%p\n",
 		__func__, __LINE__, count, *pos, buf);

 	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;
 	}

 	start_sector = *pos / dev->blk_size;
 	offset = *pos % dev->blk_size;
 	end_sector = DIV_ROUND_UP(*pos + count, dev->blk_size);

 	remaining = count;
 	do {
 		mutex_lock(&priv->mutex);

 		sectors_read = ps3flash_read_sectors(dev, start_sector,
 						     end_sector-start_sector,
 						     0);
 		if (sectors_read < 0) {
 			mutex_unlock(&priv->mutex);
 			goto fail;
 		}

 		n = min(remaining, sectors_read*dev->blk_size-offset);
 		dev_dbg(&dev->sbd.core,
 			"%s:%u: copy %lu bytes from 0x%p to user 0x%p\n",
 			__func__, __LINE__, n, dev->bounce_buf+offset, buf);
 		if (copy_to_user(buf, dev->bounce_buf+offset, n)) {
 			mutex_unlock(&priv->mutex);
 			sectors_read = -EFAULT;
 			goto fail;
 		}

 		mutex_unlock(&priv->mutex);

 		*pos += n;
 		buf += n;
 		remaining -= n;
 		start_sector += sectors_read;
 		offset = 0;
 	} while (remaining > 0);

 	return count;

 fail:
 	return sectors_read;
 }

 static ssize_t ps3flash_write(struct file *file, const char __user *buf,
 			      size_t count, loff_t *pos)
 {
 	struct ps3_storage_device *dev = ps3flash_dev;
 	struct ps3flash_private *priv = dev->sbd.core.driver_data;
 	u64 size, chunk_sectors, start_write_sector, end_write_sector,
 	    end_read_sector, start_read_sector, head, tail, offset;
 	ssize_t res;
 	size_t remaining, n;
 	unsigned int sec_off;

 	dev_dbg(&dev->sbd.core,
 		"%s:%u: Writing %zu bytes at position %lld from user 0x%p\n",
 		__func__, __LINE__, count, *pos, buf);

 	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;
 	}

 	chunk_sectors = dev->bounce_size / dev->blk_size;

 	start_write_sector = *pos / dev->bounce_size * chunk_sectors;
 	offset = *pos % dev->bounce_size;
 	end_write_sector = DIV_ROUND_UP(*pos + count, dev->bounce_size) *
 			   chunk_sectors;

 	end_read_sector = DIV_ROUND_UP(*pos, dev->blk_size);
 	start_read_sector = (*pos + count) / dev->blk_size;

 	/*
 	 * As we have to write in 256 KiB chunks, while we can read in blk_size
 	 * (usually 512 bytes) chunks, we perform the following steps:
 	 *   1. Read from start_write_sector to end_read_sector ("head")
 	 *   2. Read from start_read_sector to end_write_sector ("tail")
 	 *   3. Copy data to buffer
 	 *   4. Write from start_write_sector to end_write_sector
 	 * All of this is complicated by using only one 256 KiB bounce buffer.
 	 */

 	head = end_read_sector - start_write_sector;
 	tail = end_write_sector - start_read_sector;

 	remaining = count;
 	do {
 		mutex_lock(&priv->mutex);

 		if (end_read_sector >= start_read_sector) {
 			/* Merge head and tail */
 			dev_dbg(&dev->sbd.core,
 				"Merged head and tail: %lu sectors at %lu\n",
 				chunk_sectors, start_write_sector);
 			res = ps3flash_read_sectors(dev, start_write_sector,
 						    chunk_sectors, 0);
 			if (res < 0)
 				goto fail;
 		} else {
 			if (head) {
 				/* Read head */
 				dev_dbg(&dev->sbd.core,
 					"head: %lu sectors at %lu\n", head,
 					start_write_sector);
 				res = ps3flash_read_sectors(dev,
 							    start_write_sector,
 							    head, 0);
 				if (res < 0)
 					goto fail;
 			}
 			if (start_read_sector <
 			    start_write_sector+chunk_sectors) {
 				/* Read tail */
 				dev_dbg(&dev->sbd.core,
 					"tail: %lu sectors at %lu\n", tail,
 					start_read_sector);
 				sec_off = start_read_sector-start_write_sector;
 				res = ps3flash_read_sectors(dev,
 							    start_read_sector,
 							    tail, sec_off);
 				if (res < 0)
 					goto fail;
 			}
 		}

 		n = min(remaining, dev->bounce_size-offset);
 		dev_dbg(&dev->sbd.core,
 			"%s:%u: copy %lu bytes from user 0x%p to 0x%p\n",
 			__func__, __LINE__, n, buf, dev->bounce_buf+offset);
 		if (copy_from_user(dev->bounce_buf+offset, buf, n)) {
 			res = -EFAULT;
 			goto fail;
 		}

 		res = ps3flash_write_chunk(dev, start_write_sector);
 		if (res < 0)
 			goto fail;

 		mutex_unlock(&priv->mutex);

 		*pos += n;
 		buf += n;
 		remaining -= n;
 		start_write_sector += chunk_sectors;
 		head = 0;
 		offset = 0;
 	} while (remaining > 0);

 	return count;

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


 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 %lx, expected %lx\n",
 			__func__, __LINE__, tag, dev->tag);

 	if (res) {
 		dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\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_read,
 	.write	= ps3flash_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;
 	}

 	dev->sbd.core.driver_data = priv;
 	mutex_init(&priv->mutex);

 	dev->bounce_size = ps3flash_bounce_buffer.size;
 	dev->bounce_buf = ps3flash_bounce_buffer.address;

 	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);
 	return 0;

 fail_teardown:
 	ps3stor_teardown(dev);
 fail_free_priv:
 	kfree(priv);
 	dev->sbd.core.driver_data = 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);

 	misc_deregister(&ps3flash_misc);
 	ps3stor_teardown(dev);
 	kfree(dev->sbd.core.driver_data);
 	dev->sbd.core.driver_data = 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 */
	};

	static struct ps3_storage_device *ps3flash_dev;

	static ssize_t ps3flash_read_write_sectors(struct ps3_storage_device *dev,
	u64 lpar, u64 start_sector,
	u64 sectors, int write)
	{
	u64 res = ps3stor_read_write_sectors(dev, lpar, start_sector, sectors,
	write);
	if (res) {
	dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
	__LINE__, write ? "write" : "read", res);
	return -EIO;
	}
	return sectors;
	}

	static ssize_t ps3flash_read_sectors(struct ps3_storage_device *dev,
	u64 start_sector, u64 sectors,
	unsigned int sector_offset)
	{
	u64 max_sectors, lpar;

	max_sectors = dev->bounce_size / dev->blk_size;
	if (sectors > max_sectors) {
	dev_dbg(&dev->sbd.core, "%s:%u Limiting sectors to %lu\n",
	__func__, __LINE__, max_sectors);
	sectors = max_sectors;
	}

	lpar = dev->bounce_lpar + sector_offset * dev->blk_size;
	return ps3flash_read_write_sectors(dev, lpar, start_sector, sectors,
	0);
	}

	static ssize_t ps3flash_write_chunk(struct ps3_storage_device *dev,
	u64 start_sector)
	{
	u64 sectors = dev->bounce_size / dev->blk_size;
	return ps3flash_read_write_sectors(dev, dev->bounce_lpar, start_sector,
	sectors, 1);
	}

	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(struct file file, char __user buf, size_t count,
	loff_t *pos)
	{
	struct ps3_storage_device *dev = ps3flash_dev;
	struct ps3flash_private *priv = dev->sbd.core.driver_data;
	u64 size, start_sector, end_sector, offset;
	ssize_t sectors_read;
	size_t remaining, n;

	dev_dbg(&dev->sbd.core,
	"%s:%u: Reading %zu bytes at position %lld to user 0x%p\n",
	__func__, __LINE__, count, *pos, buf);

	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;
	}

	start_sector = *pos / dev->blk_size;
	offset = *pos % dev->blk_size;
	end_sector = DIV_ROUND_UP(*pos + count, dev->blk_size);

	remaining = count;
	do {
	mutex_lock(&priv->mutex);

	sectors_read = ps3flash_read_sectors(dev, start_sector,
	end_sector-start_sector,
	0);
	if (sectors_read < 0) {
	mutex_unlock(&priv->mutex);
	goto fail;
	}

	n = min(remaining, sectors_read*dev->blk_size-offset);
	dev_dbg(&dev->sbd.core,
	"%s:%u: copy %lu bytes from 0x%p to user 0x%p\n",
	__func__, __LINE__, n, dev->bounce_buf+offset, buf);
	if (copy_to_user(buf, dev->bounce_buf+offset, n)) {
	mutex_unlock(&priv->mutex);
	sectors_read = -EFAULT;
	goto fail;
	}

	mutex_unlock(&priv->mutex);

	*pos += n;
	buf += n;
	remaining -= n;
	start_sector += sectors_read;
	offset = 0;
	} while (remaining > 0);

	return count;

	fail:
	return sectors_read;
	}

	static ssize_t ps3flash_write(struct file file, const char __user buf,
	size_t count, loff_t *pos)
	{
	struct ps3_storage_device *dev = ps3flash_dev;
	struct ps3flash_private *priv = dev->sbd.core.driver_data;
	u64 size, chunk_sectors, start_write_sector, end_write_sector,
	end_read_sector, start_read_sector, head, tail, offset;
	ssize_t res;
	size_t remaining, n;
	unsigned int sec_off;

	dev_dbg(&dev->sbd.core,
	"%s:%u: Writing %zu bytes at position %lld from user 0x%p\n",
	__func__, __LINE__, count, *pos, buf);

	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;
	}

	chunk_sectors = dev->bounce_size / dev->blk_size;

	start_write_sector = pos / dev->bounce_size chunk_sectors;
	offset = *pos % dev->bounce_size;
	end_write_sector = DIV_ROUND_UP(pos + count, dev->bounce_size)
	chunk_sectors;

	end_read_sector = DIV_ROUND_UP(*pos, dev->blk_size);
	start_read_sector = (*pos + count) / dev->blk_size;

	/*
	* As we have to write in 256 KiB chunks, while we can read in blk_size
	* (usually 512 bytes) chunks, we perform the following steps:
	* 1. Read from start_write_sector to end_read_sector ("head")
	* 2. Read from start_read_sector to end_write_sector ("tail")
	* 3. Copy data to buffer
	* 4. Write from start_write_sector to end_write_sector
	* All of this is complicated by using only one 256 KiB bounce buffer.
	*/

	head = end_read_sector - start_write_sector;
	tail = end_write_sector - start_read_sector;

	remaining = count;
	do {
	mutex_lock(&priv->mutex);

	if (end_read_sector >= start_read_sector) {
	/* Merge head and tail */
	dev_dbg(&dev->sbd.core,
	"Merged head and tail: %lu sectors at %lu\n",
	chunk_sectors, start_write_sector);
	res = ps3flash_read_sectors(dev, start_write_sector,
	chunk_sectors, 0);
	if (res < 0)
	goto fail;
	} else {
	if (head) {
	/* Read head */
	dev_dbg(&dev->sbd.core,
	"head: %lu sectors at %lu\n", head,
	start_write_sector);
	res = ps3flash_read_sectors(dev,
	start_write_sector,
	head, 0);
	if (res < 0)
	goto fail;
	}
	if (start_read_sector <
	start_write_sector+chunk_sectors) {
	/* Read tail */
	dev_dbg(&dev->sbd.core,
	"tail: %lu sectors at %lu\n", tail,
	start_read_sector);
	sec_off = start_read_sector-start_write_sector;
	res = ps3flash_read_sectors(dev,
	start_read_sector,
	tail, sec_off);
	if (res < 0)
	goto fail;
	}
	}

	n = min(remaining, dev->bounce_size-offset);
	dev_dbg(&dev->sbd.core,
	"%s:%u: copy %lu bytes from user 0x%p to 0x%p\n",
	__func__, __LINE__, n, buf, dev->bounce_buf+offset);
	if (copy_from_user(dev->bounce_buf+offset, buf, n)) {
	res = -EFAULT;
	goto fail;
	}

	res = ps3flash_write_chunk(dev, start_write_sector);
	if (res < 0)
	goto fail;

	mutex_unlock(&priv->mutex);

	*pos += n;
	buf += n;
	remaining -= n;
	start_write_sector += chunk_sectors;
	head = 0;
	offset = 0;
	} while (remaining > 0);

	return count;

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


	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 %lx, expected %lx\n",
	__func__, __LINE__, tag, dev->tag);

	if (res) {
	dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\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_read,
	.write = ps3flash_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;
	}

	dev->sbd.core.driver_data = priv;
	mutex_init(&priv->mutex);

	dev->bounce_size = ps3flash_bounce_buffer.size;
	dev->bounce_buf = ps3flash_bounce_buffer.address;

	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);
	return 0;

	fail_teardown:
	ps3stor_teardown(dev);
	fail_free_priv:
	kfree(priv);
	dev->sbd.core.driver_data = 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);

	misc_deregister(&ps3flash_misc);
	ps3stor_teardown(dev);
	kfree(dev->sbd.core.driver_data);
	dev->sbd.core.driver_data = 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);