drivers/char/ps3flash.c



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/*
 * 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;

	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 0:
		break;
	case 1: