1 files changed, 0 insertions, 407 deletions
diff --git a/ANDROID_3.4.5/drivers/mtd/mtdblock.c b/ANDROID_3.4.5/drivers/mtd/mtdblock.c
deleted file mode 100644
index 6c6d8073..00000000
--- a/ANDROID_3.4.5/drivers/mtd/mtdblock.c
+++ /dev/null
@@ -1,407 +0,0 @@
-/*
- * Direct MTD block device access
- *
- * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
- * Copyright © 2000-2003 Nicolas Pitre <nico@fluxnic.net>
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
- *
- */
-
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/vmalloc.h>
-
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/blktrans.h>
-#include <linux/mutex.h>
-
-
-struct mtdblk_dev {
-	struct mtd_blktrans_dev mbd;
-	int count;
-	struct mutex cache_mutex;
-	unsigned char *cache_data;
-	unsigned long cache_offset;
-	unsigned int cache_size;
-	enum { STATE_EMPTY, STATE_CLEAN, STATE_DIRTY } cache_state;
-};
-
-static DEFINE_MUTEX(mtdblks_lock);
-
-/*
- * Cache stuff...
- *
- * Since typical flash erasable sectors are much larger than what Linux's
- * buffer cache can handle, we must implement read-modify-write on flash
- * sectors for each block write requests.  To avoid over-erasing flash sectors
- * and to speed things up, we locally cache a whole flash sector while it is
- * being written to until a different sector is required.
- */
-
-static void erase_callback(struct erase_info *done)
-{
-	wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv;
-	wake_up(wait_q);
-}
-
-static int erase_write (struct mtd_info *mtd, unsigned long pos,
-			int len, const char *buf)
-{
-	struct erase_info erase;
-	DECLARE_WAITQUEUE(wait, current);
-	wait_queue_head_t wait_q;
-	size_t retlen;
-	int ret;
-
-	/*
-	 * First, let's erase the flash block.
-	 */
-
-	init_waitqueue_head(&wait_q);
-	erase.mtd = mtd;
-	erase.callback = erase_callback;
-	erase.addr = pos;
-	erase.len = len;
-	erase.priv = (u_long)&wait_q;
-
-	set_current_state(TASK_INTERRUPTIBLE);
-	add_wait_queue(&wait_q, &wait);
-
-	ret = mtd_erase(mtd, &erase);
-	if (ret) {
-		set_current_state(TASK_RUNNING);
-		remove_wait_queue(&wait_q, &wait);
-		printk (KERN_WARNING "mtdblock: erase of region [0x%lx, 0x%x] "
-				     "on \"%s\" failed\n",
-			pos, len, mtd->name);
-		return ret;
-	}
-
-	schedule();  /* Wait for erase to finish. */
-	remove_wait_queue(&wait_q, &wait);
-
-	/*
-	 * Next, write the data to flash.
-	 */
-
-	ret = mtd_write(mtd, pos, len, &retlen, buf);
-	if (ret)
-		return ret;
-	if (retlen != len)
-		return -EIO;
-	return 0;
-}
-
-
-static int write_cached_data (struct mtdblk_dev *mtdblk)
-{
-	struct mtd_info *mtd = mtdblk->mbd.mtd;
-	int ret;
-
-	if (mtdblk->cache_state != STATE_DIRTY)
-		return 0;
-
-	pr_debug("mtdblock: writing cached data for \"%s\" "
-			"at 0x%lx, size 0x%x\n", mtd->name,
-			mtdblk->cache_offset, mtdblk->cache_size);
-
-	ret = erase_write (mtd, mtdblk->cache_offset,
-			   mtdblk->cache_size, mtdblk->cache_data);
-	if (ret)
-		return ret;
-
-	/*
-	 * Here we could arguably set the cache state to STATE_CLEAN.
-	 * However this could lead to inconsistency since we will not
-	 * be notified if this content is altered on the flash by other
-	 * means.  Let's declare it empty and leave buffering tasks to
-	 * the buffer cache instead.
-	 */
-	mtdblk->cache_state = STATE_EMPTY;
-	return 0;
-}
-
-
-static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,
-			    int len, const char *buf)
-{
-	struct mtd_info *mtd = mtdblk->mbd.mtd;
-	unsigned int sect_size = mtdblk->cache_size;
-	size_t retlen;
-	int ret;
-
-	pr_debug("mtdblock: write on \"%s\" at 0x%lx, size 0x%x\n",
-		mtd->name, pos, len);
-
-	if (!sect_size)
-		return mtd_write(mtd, pos, len, &retlen, buf);
-
-	while (len > 0) {
-		unsigned long sect_start = (pos/sect_size)*sect_size;
-		unsigned int offset = pos - sect_start;
-		unsigned int size = sect_size - offset;
-		if( size > len )
-			size = len;
-
-		if (size == sect_size) {
-			/*
-			 * We are covering a whole sector.  Thus there is no
-			 * need to bother with the cache while it may still be
-			 * useful for other partial writes.
-			 */
-			ret = erase_write (mtd, pos, size, buf);
-			if (ret)
-				return ret;
-		} else {
-			/* Partial sector: need to use the cache */
-
-			if (mtdblk->cache_state == STATE_DIRTY &&
-			    mtdblk->cache_offset != sect_start) {
-				ret = write_cached_data(mtdblk);
-				if (ret)
-					return ret;
-			}
-
-			if (mtdblk->cache_state == STATE_EMPTY ||
-			    mtdblk->cache_offset != sect_start) {
-				/* fill the cache with the current sector */
-				mtdblk->cache_state = STATE_EMPTY;
-				ret = mtd_read(mtd, sect_start, sect_size,
-					       &retlen, mtdblk->cache_data);
-				if (ret)
-					return ret;
-				if (retlen != sect_size)
-					return -EIO;
-
-				mtdblk->cache_offset = sect_start;
-				mtdblk->cache_size = sect_size;
-				mtdblk->cache_state = STATE_CLEAN;
-			}
-
-			/* write data to our local cache */
-			memcpy (mtdblk->cache_data + offset, buf, size);
-			mtdblk->cache_state = STATE_DIRTY;
-		}
-
-		buf += size;
-		pos += size;
-		len -= size;
-	}
-
-	return 0;
-}
-
-
-static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
-			   int len, char *buf)
-{
-	struct mtd_info *mtd = mtdblk->mbd.mtd;
-	unsigned int sect_size = mtdblk->cache_size;
-	size_t retlen;
-	int ret;
-
-	pr_debug("mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n",
-			mtd->name, pos, len);
-
-	if (!sect_size)
-		return mtd_read(mtd, pos, len, &retlen, buf);
-
-	while (len > 0) {
-		unsigned long sect_start = (pos/sect_size)*sect_size;
-		unsigned int offset = pos - sect_start;
-		unsigned int size = sect_size - offset;
-		if (size > len)
-			size = len;
-
-		/*
-		 * Check if the requested data is already cached
-		 * Read the requested amount of data from our internal cache if it
-		 * contains what we want, otherwise we read the data directly
-		 * from flash.
-		 */
-		if (mtdblk->cache_state != STATE_EMPTY &&
-		    mtdblk->cache_offset == sect_start) {
-			memcpy (buf, mtdblk->cache_data + offset, size);
-		} else {
-			ret = mtd_read(mtd, pos, size, &retlen, buf);
-			if (ret)
-				return ret;
-			if (retlen != size)
-				return -EIO;
-		}
-
-		buf += size;
-		pos += size;
-		len -= size;
-	}
-
-	return 0;
-}
-
-static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
-			      unsigned long block, char *buf)
-{
-	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
-	return do_cached_read(mtdblk, block<<9, 512, buf);
-}
-
-static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
-			      unsigned long block, char *buf)
-{
-	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
-	if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {
-		mtdblk->cache_data = vmalloc(mtdblk->mbd.mtd->erasesize);
-		if (!mtdblk->cache_data)
-			return -EINTR;
-		/* -EINTR is not really correct, but it is the best match
-		 * documented in man 2 write for all cases.  We could also
-		 * return -EAGAIN sometimes, but why bother?
-		 */
-	}
-	return do_cached_write(mtdblk, block<<9, 512, buf);
-}
-
-static int mtdblock_open(struct mtd_blktrans_dev *mbd)
-{
-	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);
-
-	pr_debug("mtdblock_open\n");
-
-	mutex_lock(&mtdblks_lock);
-	if (mtdblk->count) {
-		mtdblk->count++;
-		mutex_unlock(&mtdblks_lock);
-		return 0;
-	}
-
-	/* OK, it's not open. Create cache info for it */
-	mtdblk->count = 1;
-	mutex_init(&mtdblk->cache_mutex);
-	mtdblk->cache_state = STATE_EMPTY;
-	if (!(mbd->mtd->flags & MTD_NO_ERASE) && mbd->mtd->erasesize) {
-		mtdblk->cache_size = mbd->mtd->erasesize;
-		mtdblk->cache_data = NULL;
-	}
-
-	mutex_unlock(&mtdblks_lock);
-
-	pr_debug("ok\n");
-
-	return 0;
-}
-
-static int mtdblock_release(struct mtd_blktrans_dev *mbd)
-{
-	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);
-
-	pr_debug("mtdblock_release\n");
-
-	mutex_lock(&mtdblks_lock);
-
-	mutex_lock(&mtdblk->cache_mutex);
-	write_cached_data(mtdblk);
-	mutex_unlock(&mtdblk->cache_mutex);
-
-	if (!--mtdblk->count) {
-		/*
-		 * It was the last usage. Free the cache, but only sync if
-		 * opened for writing.
-		 */
-		if (mbd->file_mode & FMODE_WRITE)
-			mtd_sync(mbd->mtd);
-		vfree(mtdblk->cache_data);
-	}
-
-	mutex_unlock(&mtdblks_lock);
-
-	pr_debug("ok\n");
-
-	return 0;
-}
-
-static int mtdblock_flush(struct mtd_blktrans_dev *dev)
-{
-	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
-
-	mutex_lock(&mtdblk->cache_mutex);
-	write_cached_data(mtdblk);
-	mutex_unlock(&mtdblk->cache_mutex);
-	mtd_sync(dev->mtd);
-	return 0;
-}
-
-static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
-{
-	struct mtdblk_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
-
-	if (!dev)
-		return;
-
-	dev->mbd.mtd = mtd;
-	dev->mbd.devnum = mtd->index;
-
-	dev->mbd.size = mtd->size >> 9;
-	dev->mbd.tr = tr;
-
-	if (!(mtd->flags & MTD_WRITEABLE))
-		dev->mbd.readonly = 1;
-
-	if (add_mtd_blktrans_dev(&dev->mbd))
-		kfree(dev);
-}
-
-static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev)
-{
-	del_mtd_blktrans_dev(dev);
-}
-
-static struct mtd_blktrans_ops mtdblock_tr = {
-	.name		= "mtdblock",
-	.major		= 31,
-	.part_bits	= 0,
-	.blksize 	= 512,
-	.open		= mtdblock_open,
-	.flush		= mtdblock_flush,
-	.release	= mtdblock_release,
-	.readsect	= mtdblock_readsect,
-	.writesect	= mtdblock_writesect,
-	.add_mtd	= mtdblock_add_mtd,
-	.remove_dev	= mtdblock_remove_dev,
-	.owner		= THIS_MODULE,
-};
-
-static int __init init_mtdblock(void)
-{
-	return register_mtd_blktrans(&mtdblock_tr);
-}
-
-static void __exit cleanup_mtdblock(void)
-{
-	deregister_mtd_blktrans(&mtdblock_tr);
-}
-
-module_init(init_mtdblock);
-module_exit(cleanup_mtdblock);
-
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Nicolas Pitre <nico@fluxnic.net> et al.");
-MODULE_DESCRIPTION("Caching read/erase/writeback block device emulation access to MTD devices");