Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc:
  mmc: at91_mci: fix hanging and rework to match flowcharts
  mmc: at91_mci typo
  sdhci: Fix "Unexpected interrupt" handling
  mmc: fix silly copy-and-paste error
  mmc: move layer init and workqueue to core file
  mmc: refactor host class handling
  mmc: refactor bus operations
  sdhci: add ene controller id
  mmc: bounce requests for simple hosts

17 files changed, 979 insertions, 572 deletions

diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig
index 9320a8c73239..a49cb9737cd8 100644
--- a/drivers/mmc/card/Kconfig
+++ b/drivers/mmc/card/Kconfig
@@ -14,3 +14,21 @@ config MMC_BLOCK
 	  mount the filesystem. Almost everyone wishing MMC support
 	  should say Y or M here.
 
+config MMC_BLOCK_BOUNCE
+	bool "Use bounce buffer for simple hosts"
+	depends on MMC_BLOCK
+	default y
+	help
+	  SD/MMC is a high latency protocol where it is crucial to
+	  send large requests in order to get high performance. Many
+	  controllers, however, are restricted to continuous memory
+	  (i.e. they can't do scatter-gather), something the kernel
+	  rarely can provide.
+
+	  Say Y here to help these restricted hosts by bouncing
+	  requests back and forth from a large buffer. You will get
+	  a big performance gain at the cost of up to 64 KiB of
+	  physical memory.
+
+	  If unsure, say Y here.
+
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 540ff4bea54c..cbd4b6e3e17c 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -262,7 +262,9 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		}
 
 		brq.data.sg = mq->sg;
-		brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);
+		brq.data.sg_len = mmc_queue_map_sg(mq);
+
+		mmc_queue_bounce_pre(mq);
 
 		if (brq.data.blocks !=
 		    (req->nr_sectors >> (md->block_bits - 9))) {
@@ -279,6 +281,9 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		}
 
 		mmc_wait_for_req(card->host, &brq.mrq);
+
+		mmc_queue_bounce_post(mq);
+
 		if (brq.cmd.error) {
 			printk(KERN_ERR "%s: error %d sending read/write command\n",
 			       req->rq_disk->disk_name, brq.cmd.error);
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index dd97bc798409..4fb2089dc690 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -17,6 +17,8 @@
 #include <linux/mmc/host.h>
 #include "queue.h"
 
+#define MMC_QUEUE_BOUNCESZ	65536
+
 #define MMC_QUEUE_SUSPENDED	(1 << 0)
 
 /*
@@ -118,6 +120,7 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
 	struct mmc_host *host = card->host;
 	u64 limit = BLK_BOUNCE_HIGH;
 	int ret;
+	unsigned int bouncesz;
 
 	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
 		limit = *mmc_dev(host)->dma_mask;
@@ -127,21 +130,61 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
 	if (!mq->queue)
 		return -ENOMEM;
 
-	blk_queue_prep_rq(mq->queue, mmc_prep_request);
-	blk_queue_bounce_limit(mq->queue, limit);
-	blk_queue_max_sectors(mq->queue, host->max_req_size / 512);
-	blk_queue_max_phys_segments(mq->queue, host->max_phys_segs);
-	blk_queue_max_hw_segments(mq->queue, host->max_hw_segs);
-	blk_queue_max_segment_size(mq->queue, host->max_seg_size);
-
 	mq->queue->queuedata = mq;
 	mq->req = NULL;
 
-	mq->sg = kmalloc(sizeof(struct scatterlist) * host->max_phys_segs,
-			 GFP_KERNEL);
-	if (!mq->sg) {
-		ret = -ENOMEM;
-		goto cleanup_queue;
+	blk_queue_prep_rq(mq->queue, mmc_prep_request);
+
+#ifdef CONFIG_MMC_BLOCK_BOUNCE
+	if (host->max_hw_segs == 1) {
+		bouncesz = MMC_QUEUE_BOUNCESZ;
+
+		if (bouncesz > host->max_req_size)
+			bouncesz = host->max_req_size;
+		if (bouncesz > host->max_seg_size)
+			bouncesz = host->max_seg_size;
+
+		mq->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
+		if (!mq->bounce_buf) {
+			printk(KERN_WARNING "%s: unable to allocate "
+				"bounce buffer\n", mmc_card_name(card));
+		} else {
+			blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH);
+			blk_queue_max_sectors(mq->queue, bouncesz / 512);
+			blk_queue_max_phys_segments(mq->queue, bouncesz / 512);
+			blk_queue_max_hw_segments(mq->queue, bouncesz / 512);
+			blk_queue_max_segment_size(mq->queue, bouncesz);
+
+			mq->sg = kmalloc(sizeof(struct scatterlist),
+				GFP_KERNEL);
+			if (!mq->sg) {
+				ret = -ENOMEM;
+				goto free_bounce_buf;
+			}
+
+			mq->bounce_sg = kmalloc(sizeof(struct scatterlist) *
+				bouncesz / 512, GFP_KERNEL);
+			if (!mq->bounce_sg) {
+				ret = -ENOMEM;
+				goto free_sg;
+			}
+		}
+	}
+#endif
+
+	if (!mq->bounce_buf) {
+		blk_queue_bounce_limit(mq->queue, limit);
+		blk_queue_max_sectors(mq->queue, host->max_req_size / 512);
+		blk_queue_max_phys_segments(mq->queue, host->max_phys_segs);
+		blk_queue_max_hw_segments(mq->queue, host->max_hw_segs);
+		blk_queue_max_segment_size(mq->queue, host->max_seg_size);
+
+		mq->sg = kmalloc(sizeof(struct scatterlist) *
+			host->max_phys_segs, GFP_KERNEL);
+		if (!mq->sg) {
+			ret = -ENOMEM;
+			goto cleanup_queue;
+		}
 	}
 
 	init_MUTEX(&mq->thread_sem);
@@ -149,14 +192,21 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
 	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd");
 	if (IS_ERR(mq->thread)) {
 		ret = PTR_ERR(mq->thread);
-		goto free_sg;
+		goto free_bounce_sg;
 	}
 
 	return 0;
-
+ free_bounce_sg:
+ 	if (mq->bounce_sg)
+ 		kfree(mq->bounce_sg);
+ 	mq->bounce_sg = NULL;
  free_sg:
 	kfree(mq->sg);
 	mq->sg = NULL;
+ free_bounce_buf:
+	if (mq->bounce_buf)
+		kfree(mq->bounce_buf);
+	mq->bounce_buf = NULL;
  cleanup_queue:
 	blk_cleanup_queue(mq->queue);
 	return ret;
@@ -178,9 +228,17 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
 	/* Then terminate our worker thread */
 	kthread_stop(mq->thread);
 
+ 	if (mq->bounce_sg)
+ 		kfree(mq->bounce_sg);
+ 	mq->bounce_sg = NULL;
+
 	kfree(mq->sg);
 	mq->sg = NULL;
 
+	if (mq->bounce_buf)
+		kfree(mq->bounce_buf);
+	mq->bounce_buf = NULL;
+
 	blk_cleanup_queue(mq->queue);
 
 	mq->card = NULL;
@@ -231,3 +289,108 @@ void mmc_queue_resume(struct mmc_queue *mq)
 	}
 }
 
+static void copy_sg(struct scatterlist *dst, unsigned int dst_len,
+	struct scatterlist *src, unsigned int src_len)
+{
+	unsigned int chunk;
+	char *dst_buf, *src_buf;
+	unsigned int dst_size, src_size;
+
+	dst_buf = NULL;
+	src_buf = NULL;
+	dst_size = 0;
+	src_size = 0;
+
+	while (src_len) {
+		BUG_ON(dst_len == 0);
+
+		if (dst_size == 0) {
+			dst_buf = page_address(dst->page) + dst->offset;
+			dst_size = dst->length;
+		}
+
+		if (src_size == 0) {
+			src_buf = page_address(src->page) + src->offset;
+			src_size = src->length;
+		}
+
+		chunk = min(dst_size, src_size);
+
+		memcpy(dst_buf, src_buf, chunk);
+
+		dst_buf += chunk;
+		src_buf += chunk;
+		dst_size -= chunk;
+		src_size -= chunk;
+
+		if (dst_size == 0) {
+			dst++;
+			dst_len--;
+		}
+
+		if (src_size == 0) {
+			src++;
+			src_len--;
+		}
+	}
+}
+
+unsigned int mmc_queue_map_sg(struct mmc_queue *mq)
+{
+	unsigned int sg_len;
+
+	if (!mq->bounce_buf)
+		return blk_rq_map_sg(mq->queue, mq->req, mq->sg);
+
+	BUG_ON(!mq->bounce_sg);
+
+	sg_len = blk_rq_map_sg(mq->queue, mq->req, mq->bounce_sg);
+
+	mq->bounce_sg_len = sg_len;
+
+	/*
+	 * Shortcut in the event we only get a single entry.
+	 */
+	if (sg_len == 1) {
+		memcpy(mq->sg, mq->bounce_sg, sizeof(struct scatterlist));
+		return 1;
+	}
+
+	mq->sg[0].page = virt_to_page(mq->bounce_buf);
+	mq->sg[0].offset = offset_in_page(mq->bounce_buf);
+	mq->sg[0].length = 0;
+
+	while (sg_len) {
+		mq->sg[0].length += mq->bounce_sg[sg_len - 1].length;
+		sg_len--;
+	}
+
+	return 1;
+}
+
+void mmc_queue_bounce_pre(struct mmc_queue *mq)
+{
+	if (!mq->bounce_buf)
+		return;
+
+	if (mq->bounce_sg_len == 1)
+		return;
+	if (rq_data_dir(mq->req) != WRITE)
+		return;
+
+	copy_sg(mq->sg, 1, mq->bounce_sg, mq->bounce_sg_len);
+}
+
+void mmc_queue_bounce_post(struct mmc_queue *mq)
+{
+	if (!mq->bounce_buf)
+		return;
+
+	if (mq->bounce_sg_len == 1)
+		return;
+	if (rq_data_dir(mq->req) != READ)
+		return;
+
+	copy_sg(mq->bounce_sg, mq->bounce_sg_len, mq->sg, 1);
+}
+
diff --git a/drivers/mmc/card/queue.h b/drivers/mmc/card/queue.h
index 1590b3f3f1f7..64e66e0d4994 100644
--- a/drivers/mmc/card/queue.h
+++ b/drivers/mmc/card/queue.h
@@ -14,6 +14,9 @@ struct mmc_queue {
 	void			*data;
 	struct request_queue	*queue;
 	struct scatterlist	*sg;
+	char			*bounce_buf;
+	struct scatterlist	*bounce_sg;
+	unsigned int		bounce_sg_len;
 };
 
 extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *);
@@ -21,4 +24,8 @@ extern void mmc_cleanup_queue(struct mmc_queue *);
 extern void mmc_queue_suspend(struct mmc_queue *);
 extern void mmc_queue_resume(struct mmc_queue *);
 
+extern unsigned int mmc_queue_map_sg(struct mmc_queue *);
+extern void mmc_queue_bounce_pre(struct mmc_queue *);
+extern void mmc_queue_bounce_post(struct mmc_queue *);
+
 #endif
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index 1075b02ae754..3fdd08c7f143 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -7,5 +7,6 @@ ifeq ($(CONFIG_MMC_DEBUG),y)
 endif
 
 obj-$(CONFIG_MMC)		+= mmc_core.o
-mmc_core-y			:= core.o sysfs.o mmc.o mmc_ops.o sd.o sd_ops.o
+mmc_core-y			:= core.o sysfs.o bus.o host.o \
+				   mmc.o mmc_ops.o sd.o sd_ops.o
 
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
new file mode 100644
index 000000000000..348b566bf4fd
--- /dev/null
+++ b/drivers/mmc/core/bus.c
@@ -0,0 +1,253 @@
+/*
+ *  linux/drivers/mmc/core/bus.c
+ *
+ *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright (C) 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  MMC card bus driver model
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+
+#include "sysfs.h"
+#include "core.h"
+#include "bus.h"
+
+#define dev_to_mmc_card(d)	container_of(d, struct mmc_card, dev)
+#define to_mmc_driver(d)	container_of(d, struct mmc_driver, drv)
+
+static ssize_t mmc_type_show(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct mmc_card *card = dev_to_mmc_card(dev);
+
+	switch (card->type) {
+	case MMC_TYPE_MMC:
+		return sprintf(buf, "MMC\n");
+	case MMC_TYPE_SD:
+		return sprintf(buf, "SD\n");
+	default:
+		return -EFAULT;
+	}
+}
+
+static struct device_attribute mmc_dev_attrs[] = {
+	MMC_ATTR_RO(type),
+	__ATTR_NULL,
+};
+
+/*
+ * This currently matches any MMC driver to any MMC card - drivers
+ * themselves make the decision whether to drive this card in their
+ * probe method.
+ */
+static int mmc_bus_match(struct device *dev, struct device_driver *drv)
+{
+	return 1;
+}
+
+static int
+mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
+		int buf_size)
+{
+	struct mmc_card *card = dev_to_mmc_card(dev);
+	int retval = 0, i = 0, length = 0;
+
+#define add_env(fmt,val) do {					\
+	retval = add_uevent_var(envp, num_envp, &i,		\
+				buf, buf_size, &length,		\
+				fmt, val);			\
+	if (retval)						\
+		return retval;					\
+} while (0);
+
+	switch (card->type) {
+	case MMC_TYPE_MMC:
+		add_env("MMC_TYPE=%s", "MMC");
+		break;
+	case MMC_TYPE_SD:
+		add_env("MMC_TYPE=%s", "SD");
+		break;
+	}
+
+	add_env("MMC_NAME=%s", mmc_card_name(card));
+
+#undef add_env
+
+	envp[i] = NULL;
+
+	return 0;
+}
+
+static int mmc_bus_probe(struct device *dev)
+{
+	struct mmc_driver *drv = to_mmc_driver(dev->driver);
+	struct mmc_card *card = dev_to_mmc_card(dev);
+
+	return drv->probe(card);
+}
+
+static int mmc_bus_remove(struct device *dev)
+{
+	struct mmc_driver *drv = to_mmc_driver(dev->driver);
+	struct mmc_card *card = dev_to_mmc_card(dev);
+
+	drv->remove(card);
+
+	return 0;
+}
+
+static int mmc_bus_suspend(struct device *dev, pm_message_t state)
+{
+	struct mmc_driver *drv = to_mmc_driver(dev->driver);
+	struct mmc_card *card = dev_to_mmc_card(dev);
+	int ret = 0;
+
+	if (dev->driver && drv->suspend)
+		ret = drv->suspend(card, state);
+	return ret;
+}
+
+static int mmc_bus_resume(struct device *dev)
+{
+	struct mmc_driver *drv = to_mmc_driver(dev->driver);
+	struct mmc_card *card = dev_to_mmc_card(dev);
+	int ret = 0;
+
+	if (dev->driver && drv->resume)
+		ret = drv->resume(card);
+	return ret;
+}
+
+static struct bus_type mmc_bus_type = {
+	.name		= "mmc",
+	.dev_attrs	= mmc_dev_attrs,
+	.match		= mmc_bus_match,
+	.uevent		= mmc_bus_uevent,
+	.probe		= mmc_bus_probe,
+	.remove		= mmc_bus_remove,
+	.suspend	= mmc_bus_suspend,
+	.resume		= mmc_bus_resume,
+};
+
+int mmc_register_bus(void)
+{
+	return bus_register(&mmc_bus_type);
+}
+
+void mmc_unregister_bus(void)
+{
+	bus_unregister(&mmc_bus_type);
+}
+
+/**
+ *	mmc_register_driver - register a media driver
+ *	@drv: MMC media driver
+ */
+int mmc_register_driver(struct mmc_driver *drv)
+{
+	drv->drv.bus = &mmc_bus_type;
+	return driver_register(&drv->drv);
+}
+
+EXPORT_SYMBOL(mmc_register_driver);
+
+/**
+ *	mmc_unregister_driver - unregister a media driver
+ *	@drv: MMC media driver
+ */
+void mmc_unregister_driver(struct mmc_driver *drv)
+{
+	drv->drv.bus = &mmc_bus_type;
+	driver_unregister(&drv->drv);
+}
+
+EXPORT_SYMBOL(mmc_unregister_driver);
+
+static void mmc_release_card(struct device *dev)
+{
+	struct mmc_card *card = dev_to_mmc_card(dev);
+
+	kfree(card);
+}
+
+/*
+ * Allocate and initialise a new MMC card structure.
+ */
+struct mmc_card *mmc_alloc_card(struct mmc_host *host)
+{
+	struct mmc_card *card;
+
+	card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
+	if (!card)
+		return ERR_PTR(-ENOMEM);
+
+	memset(card, 0, sizeof(struct mmc_card));
+
+	card->host = host;
+
+	device_initialize(&card->dev);
+
+	card->dev.parent = mmc_classdev(host);
+	card->dev.bus = &mmc_bus_type;
+	card->dev.release = mmc_release_card;
+
+	return card;
+}
+
+/*
+ * Register a new MMC card with the driver model.
+ */
+int mmc_add_card(struct mmc_card *card)
+{
+	int ret;
+
+	snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
+		 "%s:%04x", mmc_hostname(card->host), card->rca);
+
+	card->dev.uevent_suppress = 1;
+
+	ret = device_add(&card->dev);
+	if (ret)
+		return ret;
+
+	if (card->host->bus_ops->sysfs_add) {
+		ret = card->host->bus_ops->sysfs_add(card->host, card);
+		if (ret) {
+			device_del(&card->dev);
+			return ret;
+		 }
+	}
+
+	card->dev.uevent_suppress = 0;
+
+	kobject_uevent(&card->dev.kobj, KOBJ_ADD);
+
+	mmc_card_set_present(card);
+
+	return 0;
+}
+
+/*
+ * Unregister a new MMC card with the driver model, and
+ * (eventually) free it.
+ */
+void mmc_remove_card(struct mmc_card *card)
+{
+	if (mmc_card_present(card)) {
+		if (card->host->bus_ops->sysfs_remove)
+			card->host->bus_ops->sysfs_remove(card->host, card);
+		device_del(&card->dev);
+	}
+
+	put_device(&card->dev);
+}
+
diff --git a/drivers/mmc/core/bus.h b/drivers/mmc/core/bus.h
new file mode 100644
index 000000000000..4f35431116a8
--- /dev/null
+++ b/drivers/mmc/core/bus.h
@@ -0,0 +1,22 @@
+/*
+ *  linux/drivers/mmc/core/bus.h
+ *
+ *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _MMC_CORE_BUS_H
+#define _MMC_CORE_BUS_H
+
+struct mmc_card *mmc_alloc_card(struct mmc_host *host);
+int mmc_add_card(struct mmc_card *card);
+void mmc_remove_card(struct mmc_card *card);
+
+int mmc_register_bus(void);
+void mmc_unregister_bus(void);
+
+#endif
+
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 7385acfa1dd9..b5d8a6d90cca 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -27,7 +27,8 @@
 #include <linux/mmc/sd.h>
 
 #include "core.h"
-#include "sysfs.h"
+#include "bus.h"
+#include "host.h"
 
 #include "mmc_ops.h"
 #include "sd_ops.h"
@@ -35,6 +36,25 @@
 extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
 extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
 
+static struct workqueue_struct *workqueue;
+
+/*
+ * Internal function. Schedule delayed work in the MMC work queue.
+ */
+static int mmc_schedule_delayed_work(struct delayed_work *work,
+				     unsigned long delay)
+{
+	return queue_delayed_work(workqueue, work, delay);
+}
+
+/*
+ * Internal function. Flush all scheduled work from the MMC work queue.
+ */
+static void mmc_flush_scheduled_work(void)
+{
+	flush_workqueue(workqueue);
+}
+
 /**
  *	mmc_request_done - finish processing an MMC request
  *	@host: MMC host which completed request
@@ -369,22 +389,6 @@ void mmc_set_timing(struct mmc_host *host, unsigned int timing)
 }
 
 /*
- * Allocate a new MMC card
- */
-struct mmc_card *mmc_alloc_card(struct mmc_host *host)
-{
-	struct mmc_card *card;
-
-	card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
-	if (!card)
-		return ERR_PTR(-ENOMEM);
-
-	mmc_init_card(card, host);
-
-	return card;
-}
-
-/*
  * Apply power to the MMC stack.  This is a two-stage process.
  * First, we enable power to the card without the clock running.
  * We then wait a bit for the power to stabilise.  Finally,
@@ -512,7 +516,7 @@ void mmc_detect_change(struct mmc_host *host, unsigned long delay)
 EXPORT_SYMBOL(mmc_detect_change);
 
 
-static void mmc_rescan(struct work_struct *work)
+void mmc_rescan(struct work_struct *work)
 {
 	struct mmc_host *host =
 		container_of(work, struct mmc_host, detect.work);
@@ -561,69 +565,13 @@ static void mmc_rescan(struct work_struct *work)
 	}
 }
 
-
-/**
- *	mmc_alloc_host - initialise the per-host structure.
- *	@extra: sizeof private data structure
- *	@dev: pointer to host device model structure
- *
- *	Initialise the per-host structure.
- */
-struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
+void mmc_start_host(struct mmc_host *host)
 {
-	struct mmc_host *host;
-
-	host = mmc_alloc_host_sysfs(extra, dev);
-	if (host) {
-		spin_lock_init(&host->lock);
-		init_waitqueue_head(&host->wq);
-		INIT_DELAYED_WORK(&host->detect, mmc_rescan);
-
-		/*
-		 * By default, hosts do not support SGIO or large requests.
-		 * They have to set these according to their abilities.
-		 */
-		host->max_hw_segs = 1;
-		host->max_phys_segs = 1;
-		host->max_seg_size = PAGE_CACHE_SIZE;
-
-		host->max_req_size = PAGE_CACHE_SIZE;
-		host->max_blk_size = 512;
-		host->max_blk_count = PAGE_CACHE_SIZE / 512;
-	}
-
-	return host;
-}
-
-EXPORT_SYMBOL(mmc_alloc_host);
-
-/**
- *	mmc_add_host - initialise host hardware
- *	@host: mmc host
- */
-int mmc_add_host(struct mmc_host *host)
-{
-	int ret;
-
-	ret = mmc_add_host_sysfs(host);
-	if (ret == 0) {
-		mmc_power_off(host);
-		mmc_detect_change(host, 0);
-	}
-
-	return ret;
+	mmc_power_off(host);
+	mmc_detect_change(host, 0);
 }
 
-EXPORT_SYMBOL(mmc_add_host);
-
-/**
- *	mmc_remove_host - remove host hardware
- *	@host: mmc host
- *
- *	Unregister and remove all cards associated with this host,
- *	and power down the MMC bus.
- */
-void mmc_remove_host(struct mmc_host *host)
+void mmc_stop_host(struct mmc_host *host)
 {
 #ifdef CONFIG_MMC_DEBUG
 	unsigned long flags;
@@ -648,24 +596,8 @@ void mmc_remove_host(struct mmc_host *host)
 	BUG_ON(host->card);
 
 	mmc_power_off(host);
-	mmc_remove_host_sysfs(host);
 }
 
-EXPORT_SYMBOL(mmc_remove_host);
-
-/**
- *	mmc_free_host - free the host structure
- *	@host: mmc host
- *
- *	Free the host once all references to it have been dropped.
- */
-void mmc_free_host(struct mmc_host *host)
-{
-	mmc_free_host_sysfs(host);
-}
-
-EXPORT_SYMBOL(mmc_free_host);
-
 #ifdef CONFIG_PM
 
 /**
@@ -726,4 +658,31 @@ EXPORT_SYMBOL(mmc_resume_host);
 
 #endif
 
+static int __init mmc_init(void)
+{
+	int ret;
+
+	workqueue = create_singlethread_workqueue("kmmcd");
+	if (!workqueue)
+		return -ENOMEM;
+
+	ret = mmc_register_bus();
+	if (ret == 0) {
+		ret = mmc_register_host_class();
+		if (ret)
+			mmc_unregister_bus();
+	}
+	return ret;
+}
+
+static void __exit mmc_exit(void)
+{
+	mmc_unregister_host_class();
+	mmc_unregister_bus();
+	destroy_workqueue(workqueue);
+}
+
+module_init(mmc_init);
+module_exit(mmc_exit);
+
 MODULE_LICENSE("GPL");
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 177264d090ac..ae006b30dd86 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -18,6 +18,8 @@
 struct mmc_bus_ops {
 	void (*remove)(struct mmc_host *);
 	void (*detect)(struct mmc_host *);
+	int (*sysfs_add)(struct mmc_host *, struct mmc_card *card);
+	void (*sysfs_remove)(struct mmc_host *, struct mmc_card *card);
 	void (*suspend)(struct mmc_host *);
 	void (*resume)(struct mmc_host *);
 };
@@ -54,8 +56,6 @@ void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
 void mmc_set_timing(struct mmc_host *host, unsigned int timing);
 
-struct mmc_card *mmc_alloc_card(struct mmc_host *host);
-
 static inline void mmc_delay(unsigned int ms)
 {
 	if (ms < 1000 / HZ) {
@@ -66,5 +66,9 @@ static inline void mmc_delay(unsigned int ms)
 	}
 }
 
+void mmc_rescan(struct work_struct *work);
+void mmc_start_host(struct mmc_host *host);
+void mmc_stop_host(struct mmc_host *host);
+
 #endif
 
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
new file mode 100644
index 000000000000..1433d95c40bb
--- /dev/null
+++ b/drivers/mmc/core/host.c
@@ -0,0 +1,156 @@
+/*
+ *  linux/drivers/mmc/core/host.c
+ *
+ *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright (C) 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  MMC host class device management
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/idr.h>
+#include <linux/pagemap.h>
+
+#include <linux/mmc/host.h>
+
+#include "core.h"
+#include "host.h"
+
+#define cls_dev_to_mmc_host(d)	container_of(d, struct mmc_host, class_dev)
+
+static void mmc_host_classdev_release(struct device *dev)
+{
+	struct mmc_host *host = cls_dev_to_mmc_host(dev);
+	kfree(host);
+}
+
+static struct class mmc_host_class = {
+	.name		= "mmc_host",
+	.dev_release	= mmc_host_classdev_release,
+};
+
+int mmc_register_host_class(void)
+{
+	return class_register(&mmc_host_class);
+}
+
+void mmc_unregister_host_class(void)
+{
+	class_unregister(&mmc_host_class);
+}
+
+static DEFINE_IDR(mmc_host_idr);
+static DEFINE_SPINLOCK(mmc_host_lock);
+
+/**
+ *	mmc_alloc_host - initialise the per-host structure.
+ *	@extra: sizeof private data structure
+ *	@dev: pointer to host device model structure
+ *
+ *	Initialise the per-host structure.
+ */
+struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
+{
+	struct mmc_host *host;
+
+	host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
+	if (!host)
+		return NULL;
+
+	memset(host, 0, sizeof(struct mmc_host) + extra);
+
+	host->parent = dev;
+	host->class_dev.parent = dev;
+	host->class_dev.class = &mmc_host_class;
+	device_initialize(&host->class_dev);
+
+	spin_lock_init(&host->lock);
+	init_waitqueue_head(&host->wq);
+	INIT_DELAYED_WORK(&host->detect, mmc_rescan);
+
+	/*
+	 * By default, hosts do not support SGIO or large requests.
+	 * They have to set these according to their abilities.
+	 */
+	host->max_hw_segs = 1;
+	host->max_phys_segs = 1;
+	host->max_seg_size = PAGE_CACHE_SIZE;
+
+	host->max_req_size = PAGE_CACHE_SIZE;
+	host->max_blk_size = 512;
+	host->max_blk_count = PAGE_CACHE_SIZE / 512;
+
+	return host;
+}
+
+EXPORT_SYMBOL(mmc_alloc_host);
+
+/**
+ *	mmc_add_host - initialise host hardware
+ *	@host: mmc host
+ */
+int mmc_add_host(struct mmc_host *host)
+{
+	int err;
+
+	if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
+		return -ENOMEM;
+
+	spin_lock(&mmc_host_lock);
+	err = idr_get_new(&mmc_host_idr, host, &host->index);
+	spin_unlock(&mmc_host_lock);
+	if (err)
+		return err;
+
+	snprintf(host->class_dev.bus_id, BUS_ID_SIZE,
+		 "mmc%d", host->index);
+
+	err = device_add(&host->class_dev);
+	if (err)
+		return err;
+
+	mmc_start_host(host);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(mmc_add_host);
+
+/**
+ *	mmc_remove_host - remove host hardware
+ *	@host: mmc host
+ *
+ *	Unregister and remove all cards associated with this host,
+ *	and power down the MMC bus.
+ */
+void mmc_remove_host(struct mmc_host *host)
+{
+	mmc_stop_host(host);
+
+	device_del(&host->class_dev);
+
+	spin_lock(&mmc_host_lock);
+	idr_remove(&mmc_host_idr, host->index);
+	spin_unlock(&mmc_host_lock);
+}
+
+EXPORT_SYMBOL(mmc_remove_host);
+
+/**
+ *	mmc_free_host - free the host structure
+ *	@host: mmc host
+ *
+ *	Free the host once all references to it have been dropped.
+ */
+void mmc_free_host(struct mmc_host *host)
+{
+	put_device(&host->class_dev);
+}
+
+EXPORT_SYMBOL(mmc_free_host);
+
diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
new file mode 100644
index 000000000000..c2dc3d2d9f9a
--- /dev/null
+++ b/drivers/mmc/core/host.h
@@ -0,0 +1,18 @@
+/*
+ *  linux/drivers/mmc/core/host.h
+ *
+ *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _MMC_CORE_HOST_H
+#define _MMC_CORE_HOST_H
+
+int mmc_register_host_class(void);
+void mmc_unregister_host_class(void);
+
+#endif
+
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 42cc2867ed7d..66f85bfa8dbb 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -18,6 +18,7 @@
 
 #include "core.h"
 #include "sysfs.h"
+#include "bus.h"
 #include "mmc_ops.h"
 
 static const unsigned int tran_exp[] = {
@@ -236,7 +237,7 @@ out:
  * In the case of a resume, "curcard" will contain the card
  * we're trying to reinitialise.
  */
-static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
+static int mmc_init_card(struct mmc_host *host, u32 ocr,
 	struct mmc_card *oldcard)
 {
 	struct mmc_card *card;
@@ -413,8 +414,7 @@ static void mmc_detect(struct mmc_host *host)
 	mmc_release_host(host);
 
 	if (err != MMC_ERR_NONE) {
-		mmc_remove_card(host->card);
-		host->card = NULL;
+		mmc_remove(host);
 
 		mmc_claim_host(host);
 		mmc_detach_bus(host);
@@ -422,6 +422,53 @@ static void mmc_detect(struct mmc_host *host)
 	}
 }
 
+MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
+	card->raw_cid[2], card->raw_cid[3]);
+MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
+	card->raw_csd[2], card->raw_csd[3]);
+MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year);
+MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev);
+MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev);
+MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid);
+MMC_ATTR_FN(name, "%s\n", card->cid.prod_name);
+MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid);
+MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial);
+
+static struct device_attribute mmc_dev_attrs[] = {
+	MMC_ATTR_RO(cid),
+	MMC_ATTR_RO(csd),
+	MMC_ATTR_RO(date),
+	MMC_ATTR_RO(fwrev),
+	MMC_ATTR_RO(hwrev),
+	MMC_ATTR_RO(manfid),
+	MMC_ATTR_RO(name),
+	MMC_ATTR_RO(oemid),
+	MMC_ATTR_RO(serial),
+	__ATTR_NULL,
+};
+
+/*
+ * Adds sysfs entries as relevant.
+ */
+static int mmc_sysfs_add(struct mmc_host *host, struct mmc_card *card)
+{
+	int ret;
+
+	ret = mmc_add_attrs(card, mmc_dev_attrs);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/*
+ * Removes the sysfs entries added by mmc_sysfs_add().
+ */
+static void mmc_sysfs_remove(struct mmc_host *host, struct mmc_card *card)
+{
+	mmc_remove_attrs(card, mmc_dev_attrs);
+}
+
 #ifdef CONFIG_MMC_UNSAFE_RESUME
 
 /*
@@ -453,11 +500,9 @@ static void mmc_resume(struct mmc_host *host)
 
 	mmc_claim_host(host);
 
-	err = mmc_sd_init_card(host, host->ocr, host->card);
+	err = mmc_init_card(host, host->ocr, host->card);
 	if (err != MMC_ERR_NONE) {
-		mmc_remove_card(host->card);
-		host->card = NULL;
-
+		mmc_remove(host);
 		mmc_detach_bus(host);
 	}
 
@@ -474,6 +519,8 @@ static void mmc_resume(struct mmc_host *host)
 static const struct mmc_bus_ops mmc_ops = {
 	.remove = mmc_remove,
 	.detect = mmc_detect,
+	.sysfs_add = mmc_sysfs_add,
+	.sysfs_remove = mmc_sysfs_remove,
 	.suspend = mmc_suspend,
 	.resume = mmc_resume,
 };
@@ -512,13 +559,13 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 	/*
 	 * Detect and init the card.
 	 */
-	err = mmc_sd_init_card(host, host->ocr, NULL);
+	err = mmc_init_card(host, host->ocr, NULL);
 	if (err != MMC_ERR_NONE)
 		goto err;
 
 	mmc_release_host(host);
 
-	err = mmc_register_card(host->card);
+	err = mmc_add_card(host->card);
 	if (err)
 		goto reclaim_host;
 
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 918477c490b0..1240684083f1 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -19,11 +19,10 @@
 
 #include "core.h"
 #include "sysfs.h"
+#include "bus.h"
 #include "mmc_ops.h"
 #include "sd_ops.h"
 
-#include "core.h"
-
 static const unsigned int tran_exp[] = {
 	10000,		100000,		1000000,	10000000,
 	0,		0,		0,		0
@@ -487,8 +486,7 @@ static void mmc_sd_detect(struct mmc_host *host)
 	mmc_release_host(host);
 
 	if (err != MMC_ERR_NONE) {
-		mmc_remove_card(host->card);
-		host->card = NULL;
+		mmc_sd_remove(host);
 
 		mmc_claim_host(host);
 		mmc_detach_bus(host);
@@ -496,6 +494,55 @@ static void mmc_sd_detect(struct mmc_host *host)
 	}
 }
 
+MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
+	card->raw_cid[2], card->raw_cid[3]);
+MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
+	card->raw_csd[2], card->raw_csd[3]);
+MMC_ATTR_FN(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
+MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year);
+MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev);
+MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev);
+MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid);
+MMC_ATTR_FN(name, "%s\n", card->cid.prod_name);
+MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid);
+MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial);
+
+static struct device_attribute mmc_sd_dev_attrs[] = {
+	MMC_ATTR_RO(cid),
+	MMC_ATTR_RO(csd),
+	MMC_ATTR_RO(scr),
+	MMC_ATTR_RO(date),
+	MMC_ATTR_RO(fwrev),
+	MMC_ATTR_RO(hwrev),
+	MMC_ATTR_RO(manfid),
+	MMC_ATTR_RO(name),
+	MMC_ATTR_RO(oemid),
+	MMC_ATTR_RO(serial),
+	__ATTR_NULL,
+};
+
+/*
+ * Adds sysfs entries as relevant.
+ */
+static int mmc_sd_sysfs_add(struct mmc_host *host, struct mmc_card *card)
+{
+	int ret;
+
+	ret = mmc_add_attrs(card, mmc_sd_dev_attrs);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/*
+ * Removes the sysfs entries added by mmc_sysfs_add().
+ */
+static void mmc_sd_sysfs_remove(struct mmc_host *host, struct mmc_card *card)
+{
+	mmc_remove_attrs(card, mmc_sd_dev_attrs);
+}
+
 #ifdef CONFIG_MMC_UNSAFE_RESUME
 
 /*
@@ -529,9 +576,7 @@ static void mmc_sd_resume(struct mmc_host *host)
 
 	err = mmc_sd_init_card(host, host->ocr, host->card);
 	if (err != MMC_ERR_NONE) {
-		mmc_remove_card(host->card);
-		host->card = NULL;
-
+		mmc_sd_remove(host);
 		mmc_detach_bus(host);
 	}
 
@@ -548,6 +593,8 @@ static void mmc_sd_resume(struct mmc_host *host)
 static const struct mmc_bus_ops mmc_sd_ops = {
 	.remove = mmc_sd_remove,
 	.detect = mmc_sd_detect,
+	.sysfs_add = mmc_sd_sysfs_add,
+	.sysfs_remove = mmc_sd_sysfs_remove,
 	.suspend = mmc_sd_suspend,
 	.resume = mmc_sd_resume,
 };
@@ -599,7 +646,7 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 
 	mmc_release_host(host);
 
-	err = mmc_register_card(host->card);
+	err = mmc_add_card(host->card);
 	if (err)
 		goto reclaim_host;
 
diff --git a/drivers/mmc/core/sysfs.c b/drivers/mmc/core/sysfs.c
index 843b1fbba557..00a97e70f914 100644
--- a/drivers/mmc/core/sysfs.c
+++ b/drivers/mmc/core/sysfs.c
@@ -2,6 +2,7 @@
  *  linux/drivers/mmc/core/sysfs.c
  *
  *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright 2007 Pierre Ossman
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -9,352 +10,34 @@
  *
  *  MMC sysfs/driver model support.
  */
-#include <linux/module.h>
-#include <linux/init.h>
 #include <linux/device.h>
-#include <linux/idr.h>
-#include <linux/workqueue.h>
 
 #include <linux/mmc/card.h>
-#include <linux/mmc/host.h>
 
 #include "sysfs.h"
 
-#define dev_to_mmc_card(d)	container_of(d, struct mmc_card, dev)
-#define to_mmc_driver(d)	container_of(d, struct mmc_driver, drv)
-#define cls_dev_to_mmc_host(d)	container_of(d, struct mmc_host, class_dev)
-
-#define MMC_ATTR(name, fmt, args...)					\
-static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf)	\
-{									\
-	struct mmc_card *card = dev_to_mmc_card(dev);			\
-	return sprintf(buf, fmt, args);					\
-}
-
-MMC_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
-	card->raw_cid[2], card->raw_cid[3]);
-MMC_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
-	card->raw_csd[2], card->raw_csd[3]);
-MMC_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
-MMC_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
-MMC_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
-MMC_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
-MMC_ATTR(manfid, "0x%06x\n", card->cid.manfid);
-MMC_ATTR(name, "%s\n", card->cid.prod_name);
-MMC_ATTR(oemid, "0x%04x\n", card->cid.oemid);
-MMC_ATTR(serial, "0x%08x\n", card->cid.serial);
-
-#define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
-
-static struct device_attribute mmc_dev_attrs[] = {
-	MMC_ATTR_RO(cid),
-	MMC_ATTR_RO(csd),
-	MMC_ATTR_RO(date),
-	MMC_ATTR_RO(fwrev),
-	MMC_ATTR_RO(hwrev),
-	MMC_ATTR_RO(manfid),
-	MMC_ATTR_RO(name),
-	MMC_ATTR_RO(oemid),
-	MMC_ATTR_RO(serial),
-	__ATTR_NULL
-};
-
-static struct device_attribute mmc_dev_attr_scr = MMC_ATTR_RO(scr);
-
-
-static void mmc_release_card(struct device *dev)
-{
-	struct mmc_card *card = dev_to_mmc_card(dev);
-
-	kfree(card);
-}
-
-/*
- * This currently matches any MMC driver to any MMC card - drivers
- * themselves make the decision whether to drive this card in their
- * probe method.
- */
-static int mmc_bus_match(struct device *dev, struct device_driver *drv)
-{
-	return 1;
-}
-
-static int
-mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
-		int buf_size)
-{
-	struct mmc_card *card = dev_to_mmc_card(dev);
-	char ccc[13];
-	int retval = 0, i = 0, length = 0;
-
-#define add_env(fmt,val) do {					\
-	retval = add_uevent_var(envp, num_envp, &i,		\
-				buf, buf_size, &length,		\
-				fmt, val);			\
-	if (retval)						\
-		return retval;					\
-} while (0);
-
-	for (i = 0; i < 12; i++)
-		ccc[i] = card->csd.cmdclass & (1 << i) ? '1' : '0';
-	ccc[12] = '\0';
-
-	add_env("MMC_CCC=%s", ccc);
-	add_env("MMC_MANFID=%06x", card->cid.manfid);
-	add_env("MMC_NAME=%s", mmc_card_name(card));
-	add_env("MMC_OEMID=%04x", card->cid.oemid);
-#undef add_env
-	envp[i] = NULL;
-
-	return 0;
-}
-
-static int mmc_bus_suspend(struct device *dev, pm_message_t state)
-{
-	struct mmc_driver *drv = to_mmc_driver(dev->driver);
-	struct mmc_card *card = dev_to_mmc_card(dev);
-	int ret = 0;
-
-	if (dev->driver && drv->suspend)
-		ret = drv->suspend(card, state);
-	return ret;
-}
-
-static int mmc_bus_resume(struct device *dev)
-{
-	struct mmc_driver *drv = to_mmc_driver(dev->driver);
-	struct mmc_card *card = dev_to_mmc_card(dev);
-	int ret = 0;
-
-	if (dev->driver && drv->resume)
-		ret = drv->resume(card);
-	return ret;
-}
-
-static int mmc_bus_probe(struct device *dev)
-{
-	struct mmc_driver *drv = to_mmc_driver(dev->driver);
-	struct mmc_card *card = dev_to_mmc_card(dev);
-
-	return drv->probe(card);
-}
-
-static int mmc_bus_remove(struct device *dev)
-{
-	struct mmc_driver *drv = to_mmc_driver(dev->driver);
-	struct mmc_card *card = dev_to_mmc_card(dev);
-
-	drv->remove(card);
-
-	return 0;
-}
-
-static struct bus_type mmc_bus_type = {
-	.name		= "mmc",
-	.dev_attrs	= mmc_dev_attrs,
-	.match		= mmc_bus_match,
-	.uevent		= mmc_bus_uevent,
-	.probe		= mmc_bus_probe,
-	.remove		= mmc_bus_remove,
-	.suspend	= mmc_bus_suspend,
-	.resume		= mmc_bus_resume,
-};
-
-/**
- *	mmc_register_driver - register a media driver
- *	@drv: MMC media driver
- */
-int mmc_register_driver(struct mmc_driver *drv)
-{
-	drv->drv.bus = &mmc_bus_type;
-	return driver_register(&drv->drv);
-}
-
-EXPORT_SYMBOL(mmc_register_driver);
-
-/**
- *	mmc_unregister_driver - unregister a media driver
- *	@drv: MMC media driver
- */
-void mmc_unregister_driver(struct mmc_driver *drv)
-{
-	drv->drv.bus = &mmc_bus_type;
-	driver_unregister(&drv->drv);
-}
-
-EXPORT_SYMBOL(mmc_unregister_driver);
-
-
-/*
- * Internal function.  Initialise a MMC card structure.
- */
-void mmc_init_card(struct mmc_card *card, struct mmc_host *host)
-{
-	memset(card, 0, sizeof(struct mmc_card));
-	card->host = host;
-	device_initialize(&card->dev);
-	card->dev.parent = mmc_classdev(host);
-	card->dev.bus = &mmc_bus_type;
-	card->dev.release = mmc_release_card;
-}
-
-/*
- * Internal function.  Register a new MMC card with the driver model.
- */
-int mmc_register_card(struct mmc_card *card)
+int mmc_add_attrs(struct mmc_card *card, struct device_attribute *attrs)
 {
-	int ret;
+	int error = 0;
+	int i;
 
-	snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
-		 "%s:%04x", mmc_hostname(card->host), card->rca);
-
-	ret = device_add(&card->dev);
-	if (ret == 0) {
-		if (mmc_card_sd(card)) {
-			ret = device_create_file(&card->dev, &mmc_dev_attr_scr);
-			if (ret)
-				device_del(&card->dev);
+	for (i = 0; attr_name(attrs[i]); i++) {
+		error = device_create_file(&card->dev, &attrs[i]);
+		if (error) {
+			while (--i >= 0)
+				device_remove_file(&card->dev, &attrs[i]);
+			break;
 		}
 	}
-	if (ret == 0)
-		mmc_card_set_present(card);
-	return ret;
-}
-
-/*
- * Internal function.  Unregister a new MMC card with the
- * driver model, and (eventually) free it.
- */
-void mmc_remove_card(struct mmc_card *card)
-{
-	if (mmc_card_present(card)) {
-		if (mmc_card_sd(card))
-			device_remove_file(&card->dev, &mmc_dev_attr_scr);
-
-		device_del(&card->dev);
-	}
-
-	put_device(&card->dev);
-}
-
-
-static void mmc_host_classdev_release(struct device *dev)
-{
-	struct mmc_host *host = cls_dev_to_mmc_host(dev);
-	kfree(host);
-}
-
-static struct class mmc_host_class = {
-	.name		= "mmc_host",
-	.dev_release	= mmc_host_classdev_release,
-};
-
-static DEFINE_IDR(mmc_host_idr);
-static DEFINE_SPINLOCK(mmc_host_lock);
-
-/*
- * Internal function. Allocate a new MMC host.
- */
-struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev)
-{
-	struct mmc_host *host;
-
-	host = kmalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
-	if (host) {
-		memset(host, 0, sizeof(struct mmc_host) + extra);
-
-		host->parent = dev;
-		host->class_dev.parent = dev;
-		host->class_dev.class = &mmc_host_class;
-		device_initialize(&host->class_dev);
-	}
 
-	return host;
+	return error;
 }
 
-/*
- * Internal function. Register a new MMC host with the MMC class.
- */
-int mmc_add_host_sysfs(struct mmc_host *host)
+void mmc_remove_attrs(struct mmc_card *card, struct device_attribute *attrs)
 {
-	int err;
-
-	if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
-		return -ENOMEM;
-
-	spin_lock(&mmc_host_lock);
-	err = idr_get_new(&mmc_host_idr, host, &host->index);
-	spin_unlock(&mmc_host_lock);
-	if (err)
-		return err;
-
-	snprintf(host->class_dev.bus_id, BUS_ID_SIZE,
-		 "mmc%d", host->index);
-
-	return device_add(&host->class_dev);
-}
+	int i;
 
-/*
- * Internal function. Unregister a MMC host with the MMC class.
- */
-void mmc_remove_host_sysfs(struct mmc_host *host)
-{
-	device_del(&host->class_dev);
-
-	spin_lock(&mmc_host_lock);
-	idr_remove(&mmc_host_idr, host->index);
-	spin_unlock(&mmc_host_lock);
-}
-
-/*
- * Internal function. Free a MMC host.
- */
-void mmc_free_host_sysfs(struct mmc_host *host)
-{
-	put_device(&host->class_dev);
-}
-
-static struct workqueue_struct *workqueue;
-
-/*
- * Internal function. Schedule delayed work in the MMC work queue.
- */
-int mmc_schedule_delayed_work(struct delayed_work *work, unsigned long delay)
-{
-	return queue_delayed_work(workqueue, work, delay);
-}
-
-/*
- * Internal function. Flush all scheduled work from the MMC work queue.
- */
-void mmc_flush_scheduled_work(void)
-{
-	flush_workqueue(workqueue);
-}
-
-static int __init mmc_init(void)
-{
-	int ret;
-
-	workqueue = create_singlethread_workqueue("kmmcd");
-	if (!workqueue)
-		return -ENOMEM;
-
-	ret = bus_register(&mmc_bus_type);
-	if (ret == 0) {
-		ret = class_register(&mmc_host_class);
-		if (ret)
-			bus_unregister(&mmc_bus_type);
-	}
-	return ret;
-}
-
-static void __exit mmc_exit(void)
-{
-	class_unregister(&mmc_host_class);
-	bus_unregister(&mmc_bus_type);
-	destroy_workqueue(workqueue);
+	for (i = 0; attr_name(attrs[i]); i++)
+		device_remove_file(&card->dev, &attrs[i]);
 }
 
-module_init(mmc_init);
-module_exit(mmc_exit);
diff --git a/drivers/mmc/core/sysfs.h b/drivers/mmc/core/sysfs.h
index 80e29b358282..4b8f670bd10f 100644
--- a/drivers/mmc/core/sysfs.h
+++ b/drivers/mmc/core/sysfs.h
@@ -11,17 +11,16 @@
 #ifndef _MMC_CORE_SYSFS_H
 #define _MMC_CORE_SYSFS_H
 
-void mmc_init_card(struct mmc_card *card, struct mmc_host *host);
-int mmc_register_card(struct mmc_card *card);
-void mmc_remove_card(struct mmc_card *card);
+#define MMC_ATTR_FN(name, fmt, args...)					\
+static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf)	\
+{									\
+	struct mmc_card *card = container_of(dev, struct mmc_card, dev);\
+	return sprintf(buf, fmt, args);					\
+}
 
-struct mmc_host *mmc_alloc_host_sysfs(int extra, struct device *dev);
-int mmc_add_host_sysfs(struct mmc_host *host);
-void mmc_remove_host_sysfs(struct mmc_host *host);
-void mmc_free_host_sysfs(struct mmc_host *host);
+#define MMC_ATTR_RO(name) __ATTR(name, S_IRUGO, mmc_##name##_show, NULL)
 
-int mmc_schedule_work(struct work_struct *work);
-int mmc_schedule_delayed_work(struct delayed_work *work, unsigned long delay);
-void mmc_flush_scheduled_work(void);
+int mmc_add_attrs(struct mmc_card *card, struct device_attribute *attrs);
+void mmc_remove_attrs(struct mmc_card *card, struct device_attribute *attrs);
 
 #endif
diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index 5b00c194b628..28c881895ab7 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -78,8 +78,6 @@
 
 #define DRIVER_NAME "at91_mci"
 
-#undef	SUPPORT_4WIRE
-
 #define FL_SENT_COMMAND	(1 << 0)
 #define FL_SENT_STOP	(1 << 1)
 
@@ -131,7 +129,7 @@ struct at91mci_host
 /*
  * Copy from sg to a dma block - used for transfers
  */
-static inline void at91mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data)
+static inline void at91_mci_sg_to_dma(struct at91mci_host *host, struct mmc_data *data)
 {
 	unsigned int len, i, size;
 	unsigned *dmabuf = host->buffer;
@@ -180,7 +178,7 @@ static inline void at91mci_sg_to_dma(struct at91mci_host *host, struct mmc_data
 /*
  * Prepare a dma read
  */
-static void at91mci_pre_dma_read(struct at91mci_host *host)
+static void at91_mci_pre_dma_read(struct at91mci_host *host)
 {
 	int i;
 	struct scatterlist *sg;
@@ -248,7 +246,7 @@ static void at91mci_pre_dma_read(struct at91mci_host *host)
 /*
  * Handle after a dma read
  */
-static void at91mci_post_dma_read(struct at91mci_host *host)
+static void at91_mci_post_dma_read(struct at91mci_host *host)
 {
 	struct mmc_command *cmd;
 	struct mmc_data *data;
@@ -268,8 +266,6 @@ static void at91mci_post_dma_read(struct at91mci_host *host)
 	}
 
 	while (host->in_use_index < host->transfer_index) {
-		unsigned int *buffer;
-
 		struct scatterlist *sg;
 
 		pr_debug("finishing index %d\n", host->in_use_index);
@@ -280,29 +276,31 @@ static void at91mci_post_dma_read(struct at91mci_host *host)
 
 		dma_unmap_page(NULL, sg->dma_address, sg->length, DMA_FROM_DEVICE);
 
-		/* Swap the contents of the buffer */
-		buffer = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
-		pr_debug("buffer = %p, length = %d\n", buffer, sg->length);
-
 		data->bytes_xfered += sg->length;
 
 		if (cpu_is_at91rm9200()) {	/* AT91RM9200 errata */
+			unsigned int *buffer;
 			int index;
 
+			/* Swap the contents of the buffer */
+			buffer = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
+			pr_debug("buffer = %p, length = %d\n", buffer, sg->length);
+
 			for (index = 0; index < (sg->length / 4); index++)
 				buffer[index] = swab32(buffer[index]);
+
+			kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
 		}
 
-		kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
 		flush_dcache_page(sg->page);
 	}
 
 	/* Is there another transfer to trigger? */
 	if (host->transfer_index < data->sg_len)
-		at91mci_pre_dma_read(host);
+		at91_mci_pre_dma_read(host);
 	else {
+		at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_ENDRX);
 		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_RXBUFF);
-		at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
 	}
 
 	pr_debug("post dma read done\n");
@@ -323,7 +321,6 @@ static void at91_mci_handle_transmitted(struct at91mci_host *host)
 
 	/* Now wait for cmd ready */
 	at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_TXBUFE);
-	at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
 
 	cmd = host->cmd;
 	if (!cmd) return;
@@ -331,18 +328,53 @@ static void at91_mci_handle_transmitted(struct at91mci_host *host)
 	data = cmd->data;
 	if (!data) return;
 
+	if (cmd->data->flags & MMC_DATA_MULTI) {
+		pr_debug("multiple write : wait for BLKE...\n");
+		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
+	} else
+		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
+
 	data->bytes_xfered = host->total_length;
 }
 
+/*Handle after command sent ready*/
+static int at91_mci_handle_cmdrdy(struct at91mci_host *host)
+{
+	if (!host->cmd)
+		return 1;
+	else if (!host->cmd->data) {
+		if (host->flags & FL_SENT_STOP) {
+			/*After multi block write, we must wait for NOTBUSY*/
+			at91_mci_write(host, AT91_MCI_IER, AT91_MCI_NOTBUSY);
+		} else return 1;
+	} else if (host->cmd->data->flags & MMC_DATA_WRITE) {
+		/*After sendding multi-block-write command, start DMA transfer*/
+		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_TXBUFE);
+		at91_mci_write(host, AT91_MCI_IER, AT91_MCI_BLKE);
+		at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
+	}
+
+	/* command not completed, have to wait */
+	return 0;
+}
+
+
 /*
  * Enable the controller
  */
 static void at91_mci_enable(struct at91mci_host *host)
 {
+	unsigned int mr;
+
 	at91_mci_write(host, AT91_MCI_CR, AT91_MCI_MCIEN);
 	at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
 	at91_mci_write(host, AT91_MCI_DTOR, AT91_MCI_DTOMUL_1M | AT91_MCI_DTOCYC);
-	at91_mci_write(host, AT91_MCI_MR, AT91_MCI_PDCMODE | 0x34a);
+	mr = AT91_MCI_PDCMODE | 0x34a;
+
+	if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
+		mr |= AT91_MCI_RDPROOF | AT91_MCI_WRPROOF;
+
+	at91_mci_write(host, AT91_MCI_MR, mr);
 
 	/* use Slot A or B (only one at same time) */
 	at91_mci_write(host, AT91_MCI_SDCR, host->board->slot_b);
@@ -358,9 +390,8 @@ static void at91_mci_disable(struct at91mci_host *host)
 
 /*
  * Send a command
- * return the interrupts to enable
  */
-static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd)
+static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command *cmd)
 {
 	unsigned int cmdr, mr;
 	unsigned int block_length;
@@ -371,8 +402,7 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
 
 	host->cmd = cmd;
 
-	/* Not sure if this is needed */
-#if 0
+	/* Needed for leaving busy state before CMD1 */
 	if ((at91_mci_read(host, AT91_MCI_SR) & AT91_MCI_RTOE) && (cmd->opcode == 1)) {
 		pr_debug("Clearing timeout\n");
 		at91_mci_write(host, AT91_MCI_ARGR, 0);
@@ -382,7 +412,7 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
 			pr_debug("Clearing: SR = %08X\n", at91_mci_read(host, AT91_MCI_SR));
 		}
 	}
-#endif
+
 	cmdr = cmd->opcode;
 
 	if (mmc_resp_type(cmd) == MMC_RSP_NONE)
@@ -439,50 +469,48 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
 		at91_mci_write(host, ATMEL_PDC_TCR, 0);
 		at91_mci_write(host, ATMEL_PDC_TNPR, 0);
 		at91_mci_write(host, ATMEL_PDC_TNCR, 0);
+		ier = AT91_MCI_CMDRDY;
+	} else {
+		/* zero block length and PDC mode */
+		mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;
+		at91_mci_write(host, AT91_MCI_MR, mr | (block_length << 16) | AT91_MCI_PDCMODE);
 
-		at91_mci_write(host, AT91_MCI_ARGR, cmd->arg);
-		at91_mci_write(host, AT91_MCI_CMDR, cmdr);
-		return AT91_MCI_CMDRDY;
-	}
-
-	mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;	/* zero block length and PDC mode */
-	at91_mci_write(host, AT91_MCI_MR, mr | (block_length << 16) | AT91_MCI_PDCMODE);
-
-	/*
-	 * Disable the PDC controller
-	 */
-	at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
-
-	if (cmdr & AT91_MCI_TRCMD_START) {
-		data->bytes_xfered = 0;
-		host->transfer_index = 0;
-		host->in_use_index = 0;
-		if (cmdr & AT91_MCI_TRDIR) {
-			/*
-			 * Handle a read
-			 */
-			host->buffer = NULL;
-			host->total_length = 0;
-
-			at91mci_pre_dma_read(host);
-			ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */;
-		}
-		else {
-			/*
-			 * Handle a write
-			 */
-			host->total_length = block_length * blocks;
-			host->buffer = dma_alloc_coherent(NULL,
-						  host->total_length,
-						  &host->physical_address, GFP_KERNEL);
-
-			at91mci_sg_to_dma(host, data);
-
-			pr_debug("Transmitting %d bytes\n", host->total_length);
+		/*
+		 * Disable the PDC controller
+		 */
+		at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
 
-			at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
-			at91_mci_write(host, ATMEL_PDC_TCR, host->total_length / 4);
-			ier = AT91_MCI_TXBUFE;
+		if (cmdr & AT91_MCI_TRCMD_START) {
+			data->bytes_xfered = 0;
+			host->transfer_index = 0;
+			host->in_use_index = 0;
+			if (cmdr & AT91_MCI_TRDIR) {
+				/*
+				 * Handle a read
+				 */
+				host->buffer = NULL;
+				host->total_length = 0;
+
+				at91_mci_pre_dma_read(host);
+				ier = AT91_MCI_ENDRX /* | AT91_MCI_RXBUFF */;
+			}
+			else {
+				/*
+				 * Handle a write
+				 */
+				host->total_length = block_length * blocks;
+				host->buffer = dma_alloc_coherent(NULL,
+						host->total_length,
+						&host->physical_address, GFP_KERNEL);
+
+				at91_mci_sg_to_dma(host, data);
+
+				pr_debug("Transmitting %d bytes\n", host->total_length);
+
+				at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
+				at91_mci_write(host, ATMEL_PDC_TCR, host->total_length / 4);
+				ier = AT91_MCI_CMDRDY;
+			}
 		}
 	}
 
@@ -497,39 +525,24 @@ static unsigned int at91_mci_send_command(struct at91mci_host *host, struct mmc_
 	if (cmdr & AT91_MCI_TRCMD_START) {
 		if (cmdr & AT91_MCI_TRDIR)
 			at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
-		else
-			at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
 	}
-	return ier;
-}
-
-/*
- * Wait for a command to complete
- */
-static void at91mci_process_command(struct at91mci_host *host, struct mmc_command *cmd)
-{
-	unsigned int ier;
-
-	ier = at91_mci_send_command(host, cmd);
-
-	pr_debug("setting ier to %08X\n", ier);
 
-	/* Stop on errors or the required value */
+	/* Enable selected interrupts */
 	at91_mci_write(host, AT91_MCI_IER, AT91_MCI_ERRORS | ier);
 }
 
 /*
  * Process the next step in the request
  */
-static void at91mci_process_next(struct at91mci_host *host)
+static void at91_mci_process_next(struct at91mci_host *host)
 {
 	if (!(host->flags & FL_SENT_COMMAND)) {
 		host->flags |= FL_SENT_COMMAND;
-		at91mci_process_command(host, host->request->cmd);
+		at91_mci_send_command(host, host->request->cmd);
 	}
 	else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) {
 		host->flags |= FL_SENT_STOP;
-		at91mci_process_command(host, host->request->stop);
+		at91_mci_send_command(host, host->request->stop);
 	}
 	else
 		mmc_request_done(host->mmc, host->request);
@@ -538,7 +551,7 @@ static void at91mci_process_next(struct at91mci_host *host)
 /*
  * Handle a command that has been completed
  */
-static void at91mci_completed_command(struct at91mci_host *host)
+static void at91_mci_completed_command(struct at91mci_host *host)
 {
 	struct mmc_command *cmd = host->cmd;
 	unsigned int status;
@@ -583,7 +596,7 @@ static void at91mci_completed_command(struct at91mci_host *host)
 	else
 		cmd->error = MMC_ERR_NONE;
 
-	at91mci_process_next(host);
+	at91_mci_process_next(host);
 }
 
 /*
@@ -595,7 +608,7 @@ static void at91_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
 	host->request = mrq;
 	host->flags = 0;
 
-	at91mci_process_next(host);
+	at91_mci_process_next(host);
 }
 
 /*
@@ -698,29 +711,33 @@ static irqreturn_t at91_mci_irq(int irq, void *devid)
 			at91_mci_handle_transmitted(host);
 		}
 
+		if (int_status & AT91_MCI_ENDRX) {
+			pr_debug("ENDRX\n");
+			at91_mci_post_dma_read(host);
+		}
+
 		if (int_status & AT91_MCI_RXBUFF) {
 			pr_debug("RX buffer full\n");
-			at91_mci_write(host, AT91_MCI_IER, AT91_MCI_CMDRDY);
+			at91_mci_write(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
+			at91_mci_write(host, AT91_MCI_IDR, AT91_MCI_RXBUFF | AT91_MCI_ENDRX);
+			completed = 1;
 		}
 
 		if (int_status & AT91_MCI_ENDTX)
 			pr_debug("Transmit has ended\n");
 
-		if (int_status & AT91_MCI_ENDRX) {
-			pr_debug("Receive has ended\n");
-			at91mci_post_dma_read(host);
-		}
-
 		if (int_status & AT91_MCI_NOTBUSY) {
 			pr_debug("Card is ready\n");
-			at91_mci_write(host, AT91_MCI_IER, AT91_MCI_CMDRDY);
+			completed = 1;
 		}
 
 		if (int_status & AT91_MCI_DTIP)
 			pr_debug("Data transfer in progress\n");
 
-		if (int_status & AT91_MCI_BLKE)
+		if (int_status & AT91_MCI_BLKE) {
 			pr_debug("Block transfer has ended\n");
+			completed = 1;
+		}
 
 		if (int_status & AT91_MCI_TXRDY)
 			pr_debug("Ready to transmit\n");
@@ -730,14 +747,14 @@ static irqreturn_t at91_mci_irq(int irq, void *devid)
 
 		if (int_status & AT91_MCI_CMDRDY) {
 			pr_debug("Command ready\n");
-			completed = 1;
+			completed = at91_mci_handle_cmdrdy(host);
 		}
 	}
 
 	if (completed) {
 		pr_debug("Completed command\n");
 		at91_mci_write(host, AT91_MCI_IDR, 0xffffffff);
-		at91mci_completed_command(host);
+		at91_mci_completed_command(host);
 	} else
 		at91_mci_write(host, AT91_MCI_IDR, int_status);
 
@@ -830,11 +847,11 @@ static int __init at91_mci_probe(struct platform_device *pdev)
 	host->bus_mode = 0;
 	host->board = pdev->dev.platform_data;
 	if (host->board->wire4) {
-#ifdef SUPPORT_4WIRE
-		mmc->caps |= MMC_CAP_4_BIT_DATA;
-#else
-		printk("AT91 MMC: 4 wire bus mode not supported by this driver - using 1 wire\n");
-#endif
+		if (cpu_is_at91sam9260() || cpu_is_at91sam9263())
+			mmc->caps |= MMC_CAP_4_BIT_DATA;
+		else
+			printk("AT91 MMC: 4 wire bus mode not supported"
+				" - using 1 wire\n");
 	}
 
 	/*
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a359efdd77eb..10d15c39d003 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -70,6 +70,14 @@ static const struct pci_device_id pci_ids[] __devinitdata = {
 		.driver_data	= SDHCI_QUIRK_SINGLE_POWER_WRITE,
 	},
 
+	{
+		.vendor		= PCI_VENDOR_ID_ENE,
+		.device		= PCI_DEVICE_ID_ENE_CB712_SD_2,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
+		.driver_data	= SDHCI_QUIRK_SINGLE_POWER_WRITE,
+	},
+
 	{	/* Generic SD host controller */
 		PCI_DEVICE_CLASS((PCI_CLASS_SYSTEM_SDHCI << 8), 0xFFFF00)
 	},
@@ -1022,7 +1030,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
 		writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
 	}
 
-	intmask &= SDHCI_INT_BUS_POWER;
+	intmask &= ~SDHCI_INT_BUS_POWER;
 
 	if (intmask) {
 		printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",