38 files changed, 4006 insertions, 3098 deletions

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 12af9c71876..6c97491543d 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -19,110 +19,10 @@ config MMC_DEBUG
 	  This is an option for use by developers; most people should
 	  say N here.  This enables MMC core and driver debugging.
 
-config MMC_BLOCK
-	tristate "MMC block device driver"
-	depends on MMC && BLOCK
-	default y
-	help
-	  Say Y here to enable the MMC block device driver support.
-	  This provides a block device driver, which you can use to
-	  mount the filesystem. Almost everyone wishing MMC support
-	  should say Y or M here.
-
-config MMC_ARMMMCI
-	tristate "ARM AMBA Multimedia Card Interface support"
-	depends on ARM_AMBA && MMC
-	help
-	  This selects the ARM(R) AMBA(R) PrimeCell Multimedia Card
-	  Interface (PL180 and PL181) support.  If you have an ARM(R)
-	  platform with a Multimedia Card slot, say Y or M here.
-
-	  If unsure, say N.
-
-config MMC_PXA
-	tristate "Intel PXA25x/26x/27x Multimedia Card Interface support"
-	depends on ARCH_PXA && MMC
-	help
-	  This selects the Intel(R) PXA(R) Multimedia card Interface.
-	  If you have a PXA(R) platform with a Multimedia Card slot,
-	  say Y or M here.
-
-	  If unsure, say N.
-
-config MMC_SDHCI
-	tristate "Secure Digital Host Controller Interface support  (EXPERIMENTAL)"
-	depends on PCI && MMC && EXPERIMENTAL
-	help
-	  This select the generic Secure Digital Host Controller Interface.
-	  It is used by manufacturers such as Texas Instruments(R), Ricoh(R)
-	  and Toshiba(R). Most controllers found in laptops are of this type.
-	  If you have a controller with this interface, say Y or M here.
-
-	  If unsure, say N.
-
-config MMC_OMAP
-	tristate "TI OMAP Multimedia Card Interface support"
-	depends on ARCH_OMAP && MMC
-	select TPS65010 if MACH_OMAP_H2
-	help
-	  This selects the TI OMAP Multimedia card Interface.
-	  If you have an OMAP board with a Multimedia Card slot,
-	  say Y or M here.
-
-	  If unsure, say N.
+source "drivers/mmc/core/Kconfig"
 
-config MMC_WBSD
-	tristate "Winbond W83L51xD SD/MMC Card Interface support"
-	depends on MMC && ISA_DMA_API
-	help
-	  This selects the Winbond(R) W83L51xD Secure digital and
-          Multimedia card Interface.
-	  If you have a machine with a integrated W83L518D or W83L519D
-	  SD/MMC card reader, say Y or M here.
-
-	  If unsure, say N.
-
-config MMC_AU1X
-	tristate "Alchemy AU1XX0 MMC Card Interface support"
-	depends on MMC && SOC_AU1200
-	help
-	  This selects the AMD Alchemy(R) Multimedia card interface.
-	  If you have a Alchemy platform with a MMC slot, say Y or M here.
-
-	  If unsure, say N.
-
-config MMC_AT91
-	tristate "AT91 SD/MMC Card Interface support"
-	depends on ARCH_AT91 && MMC
-	help
-	  This selects the AT91 MCI controller.
-
-	  If unsure, say N.
-
-config MMC_IMX
-	tristate "Motorola i.MX Multimedia Card Interface support"
-	depends on ARCH_IMX && MMC
-	help
-	  This selects the Motorola i.MX Multimedia card Interface.
-	  If you have a i.MX platform with a Multimedia Card slot,
-	  say Y or M here.
-
-	  If unsure, say N.
-
-config MMC_TIFM_SD
-	tristate "TI Flash Media MMC/SD Interface support  (EXPERIMENTAL)"
-	depends on MMC && EXPERIMENTAL && PCI
-	select TIFM_CORE
-	help
-	  Say Y here if you want to be able to access MMC/SD cards with
-	  the Texas Instruments(R) Flash Media card reader, found in many
-	  laptops.
-	  This option 'selects' (turns on, enables) 'TIFM_CORE', but you
-	  probably also need appropriate card reader host adapter, such as
-	  'Misc devices: TI Flash Media PCI74xx/PCI76xx host adapter support
-	  (TIFM_7XX1)'.
+source "drivers/mmc/card/Kconfig"
 
-          To compile this driver as a module, choose M here: the
-	  module will be called tifm_sd.
+source "drivers/mmc/host/Kconfig"
 
 endmenu
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 83ffb9326a5..9979f5e9765 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -2,32 +2,11 @@
 # Makefile for the kernel mmc device drivers.
 #
 
-#
-# Core
-#
-obj-$(CONFIG_MMC)		+= mmc_core.o
-
-#
-# Media drivers
-#
-obj-$(CONFIG_MMC_BLOCK)		+= mmc_block.o
-
-#
-# Host drivers
-#
-obj-$(CONFIG_MMC_ARMMMCI)	+= mmci.o
-obj-$(CONFIG_MMC_PXA)		+= pxamci.o
-obj-$(CONFIG_MMC_IMX)		+= imxmmc.o
-obj-$(CONFIG_MMC_SDHCI)		+= sdhci.o
-obj-$(CONFIG_MMC_WBSD)		+= wbsd.o
-obj-$(CONFIG_MMC_AU1X)		+= au1xmmc.o
-obj-$(CONFIG_MMC_OMAP)		+= omap.o
-obj-$(CONFIG_MMC_AT91)		+= at91_mci.o
-obj-$(CONFIG_MMC_TIFM_SD)	+= tifm_sd.o
-
-mmc_core-y := mmc.o mmc_sysfs.o
-mmc_core-$(CONFIG_BLOCK) += mmc_queue.o
-
 ifeq ($(CONFIG_MMC_DEBUG),y)
-EXTRA_CFLAGS += -DDEBUG
+	EXTRA_CFLAGS		+= -DDEBUG
 endif
+
+obj-$(CONFIG_MMC)		+= core/
+obj-$(CONFIG_MMC)		+= card/
+obj-$(CONFIG_MMC)		+= host/
+
diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig
new file mode 100644
index 00000000000..01a9fd376a1
--- /dev/null
+++ b/drivers/mmc/card/Kconfig
@@ -0,0 +1,17 @@
+#
+# MMC/SD card drivers
+#
+
+comment "MMC/SD Card Drivers"
+	depends MMC
+
+config MMC_BLOCK
+	tristate "MMC block device driver"
+	depends on MMC && BLOCK
+	default y
+	help
+	  Say Y here to enable the MMC block device driver support.
+	  This provides a block device driver, which you can use to
+	  mount the filesystem. Almost everyone wishing MMC support
+	  should say Y or M here.
+
diff --git a/drivers/mmc/card/Makefile b/drivers/mmc/card/Makefile
new file mode 100644
index 00000000000..cf8c939867f
--- /dev/null
+++ b/drivers/mmc/card/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for MMC/SD card drivers
+#
+
+ifeq ($(CONFIG_MMC_DEBUG),y)
+	EXTRA_CFLAGS		+= -DDEBUG
+endif
+
+obj-$(CONFIG_MMC_BLOCK)		+= mmc_block.o
+mmc_block-objs			:= block.o queue.o
+
diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/card/block.c
index 86439a0bb27..d24ab234394 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/card/block.c
@@ -2,6 +2,7 @@
  * Block driver for media (i.e., flash cards)
  *
  * Copyright 2002 Hewlett-Packard Company
+ * Copyright 2005-2007 Pierre Ossman
  *
  * Use consistent with the GNU GPL is permitted,
  * provided that this copyright notice is
@@ -31,13 +32,13 @@
 
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
-#include <linux/mmc/protocol.h>
-#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
 
-#include "mmc_queue.h"
+#include "queue.h"
 
 /*
  * max 8 partitions per card
@@ -223,10 +224,9 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 	struct mmc_blk_data *md = mq->data;
 	struct mmc_card *card = md->queue.card;
 	struct mmc_blk_request brq;
-	int ret = 1;
+	int ret = 1, sg_pos, data_size;
 
-	if (mmc_card_claim_host(card))
-		goto flush_queue;
+	mmc_claim_host(card->host);
 
 	do {
 		struct mmc_command cmd;
@@ -283,6 +283,20 @@ 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);
 
+		if (brq.data.blocks !=
+		    (req->nr_sectors >> (md->block_bits - 9))) {
+			data_size = brq.data.blocks * brq.data.blksz;
+			for (sg_pos = 0; sg_pos < brq.data.sg_len; sg_pos++) {
+				data_size -= mq->sg[sg_pos].length;
+				if (data_size <= 0) {
+					mq->sg[sg_pos].length += data_size;
+					sg_pos++;
+					break;
+				}
+			}
+			brq.data.sg_len = sg_pos;
+		}
+
 		mmc_wait_for_req(card->host, &brq.mrq);
 		if (brq.cmd.error) {
 			printk(KERN_ERR "%s: error %d sending read/write command\n",
@@ -342,7 +356,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		spin_unlock_irq(&md->lock);
 	} while (ret);
 
-	mmc_card_release_host(card);
+	mmc_release_host(card->host);
 
 	return 1;
 
@@ -378,9 +392,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 		spin_unlock_irq(&md->lock);
 	}
 
-flush_queue:
-
-	mmc_card_release_host(card);
+	mmc_release_host(card->host);
 
 	spin_lock_irq(&md->lock);
 	while (ret) {
@@ -477,11 +489,20 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 
 	blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
 
-	/*
-	 * The CSD capacity field is in units of read_blkbits.
-	 * set_capacity takes units of 512 bytes.
-	 */
-	set_capacity(md->disk, card->csd.capacity << (card->csd.read_blkbits - 9));
+	if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
+		/*
+		 * The EXT_CSD sector count is in number or 512 byte
+		 * sectors.
+		 */
+		set_capacity(md->disk, card->ext_csd.sectors);
+	} else {
+		/*
+		 * The CSD capacity field is in units of read_blkbits.
+		 * set_capacity takes units of 512 bytes.
+		 */
+		set_capacity(md->disk,
+			card->csd.capacity << (card->csd.read_blkbits - 9));
+	}
 	return md;
 
  err_putdisk:
@@ -502,12 +523,12 @@ mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 	if (mmc_card_blockaddr(card))
 		return 0;
 
-	mmc_card_claim_host(card);
+	mmc_claim_host(card->host);
 	cmd.opcode = MMC_SET_BLOCKLEN;
 	cmd.arg = 1 << md->block_bits;
 	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 	err = mmc_wait_for_cmd(card->host, &cmd, 5);
-	mmc_card_release_host(card);
+	mmc_release_host(card->host);
 
 	if (err) {
 		printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
diff --git a/drivers/mmc/mmc_queue.c b/drivers/mmc/card/queue.c
index c27e42645cd..2e77963db33 100644
--- a/drivers/mmc/mmc_queue.c
+++ b/drivers/mmc/card/queue.c
@@ -1,7 +1,8 @@
 /*
- *  linux/drivers/mmc/mmc_queue.c
+ *  linux/drivers/mmc/queue.c
  *
  *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright 2006-2007 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
@@ -14,7 +15,7 @@
 
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
-#include "mmc_queue.h"
+#include "queue.h"
 
 #define MMC_QUEUE_SUSPENDED	(1 << 0)
 
@@ -179,7 +180,6 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock
 	blk_cleanup_queue(mq->queue);
 	return ret;
 }
-EXPORT_SYMBOL(mmc_init_queue);
 
 void mmc_cleanup_queue(struct mmc_queue *mq)
 {
@@ -191,6 +191,9 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
 	q->queuedata = NULL;
 	spin_unlock_irqrestore(q->queue_lock, flags);
 
+	/* Make sure the queue isn't suspended, as that will deadlock */
+	mmc_queue_resume(mq);
+
 	/* Then terminate our worker thread */
 	kthread_stop(mq->thread);
 
@@ -226,7 +229,6 @@ void mmc_queue_suspend(struct mmc_queue *mq)
 		down(&mq->thread_sem);
 	}
 }
-EXPORT_SYMBOL(mmc_queue_suspend);
 
 /**
  * mmc_queue_resume - resume a previously suspended MMC request queue
@@ -247,4 +249,4 @@ void mmc_queue_resume(struct mmc_queue *mq)
 		spin_unlock_irqrestore(q->queue_lock, flags);
 	}
 }
-EXPORT_SYMBOL(mmc_queue_resume);
+
diff --git a/drivers/mmc/mmc_queue.h b/drivers/mmc/card/queue.h
index c9f139e764f..c9f139e764f 100644
--- a/drivers/mmc/mmc_queue.h
+++ b/drivers/mmc/card/queue.h
diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig
new file mode 100644
index 00000000000..94222b9a15e
--- /dev/null
+++ b/drivers/mmc/core/Kconfig
@@ -0,0 +1,17 @@
+#
+# MMC core configuration
+#
+
+config MMC_UNSAFE_RESUME
+	bool "Allow unsafe resume (DANGEROUS)"
+	depends on MMC != n
+	help
+	  If you say Y here, the MMC layer will assume that all cards
+	  stayed in their respective slots during the suspend. The
+	  normal behaviour is to remove them at suspend and
+	  redetecting them at resume. Breaking this assumption will
+	  in most cases result in data corruption.
+
+	  This option is usually just for embedded systems which use
+	  a MMC/SD card for rootfs. Most people should say N here.
+
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
new file mode 100644
index 00000000000..1075b02ae75
--- /dev/null
+++ b/drivers/mmc/core/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for the kernel mmc core.
+#
+
+ifeq ($(CONFIG_MMC_DEBUG),y)
+	EXTRA_CFLAGS		+= -DDEBUG
+endif
+
+obj-$(CONFIG_MMC)		+= mmc_core.o
+mmc_core-y			:= core.o sysfs.o mmc.o mmc_ops.o sd.o sd_ops.o
+
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
new file mode 100644
index 00000000000..72c7cf4a9f9
--- /dev/null
+++ b/drivers/mmc/core/core.c
@@ -0,0 +1,727 @@
+/*
+ *  linux/drivers/mmc/core/core.c
+ *
+ *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
+ *  SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
+ *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
+ *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/pagemap.h>
+#include <linux/err.h>
+#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
+
+#include "core.h"
+#include "sysfs.h"
+
+#include "mmc_ops.h"
+#include "sd_ops.h"
+
+extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
+extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
+
+/**
+ *	mmc_request_done - finish processing an MMC request
+ *	@host: MMC host which completed request
+ *	@mrq: MMC request which request
+ *
+ *	MMC drivers should call this function when they have completed
+ *	their processing of a request.
+ */
+void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
+{
+	struct mmc_command *cmd = mrq->cmd;
+	int err = cmd->error;
+
+	pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n",
+		 mmc_hostname(host), cmd->opcode, err,
+		 mrq->data ? mrq->data->error : 0,
+		 mrq->stop ? mrq->stop->error : 0,
+		 cmd->resp[0], cmd->resp[1], cmd->resp[2], cmd->resp[3]);
+
+	if (err && cmd->retries) {
+		cmd->retries--;
+		cmd->error = 0;
+		host->ops->request(host, mrq);
+	} else if (mrq->done) {
+		mrq->done(mrq);
+	}
+}
+
+EXPORT_SYMBOL(mmc_request_done);
+
+/**
+ *	mmc_start_request - start a command on a host
+ *	@host: MMC host to start command on
+ *	@mrq: MMC request to start
+ *
+ *	Queue a command on the specified host.  We expect the
+ *	caller to be holding the host lock with interrupts disabled.
+ */
+void
+mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
+{
+#ifdef CONFIG_MMC_DEBUG
+	unsigned int i, sz;
+#endif
+
+	pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
+		 mmc_hostname(host), mrq->cmd->opcode,
+		 mrq->cmd->arg, mrq->cmd->flags);
+
+	WARN_ON(!host->claimed);
+
+	mrq->cmd->error = 0;
+	mrq->cmd->mrq = mrq;
+	if (mrq->data) {
+		BUG_ON(mrq->data->blksz > host->max_blk_size);
+		BUG_ON(mrq->data->blocks > host->max_blk_count);
+		BUG_ON(mrq->data->blocks * mrq->data->blksz >
+			host->max_req_size);
+
+#ifdef CONFIG_MMC_DEBUG
+		sz = 0;
+		for (i = 0;i < mrq->data->sg_len;i++)
+			sz += mrq->data->sg[i].length;
+		BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
+#endif
+
+		mrq->cmd->data = mrq->data;
+		mrq->data->error = 0;
+		mrq->data->mrq = mrq;
+		if (mrq->stop) {
+			mrq->data->stop = mrq->stop;
+			mrq->stop->error = 0;
+			mrq->stop->mrq = mrq;
+		}
+	}
+	host->ops->request(host, mrq);
+}
+
+EXPORT_SYMBOL(mmc_start_request);
+
+static void mmc_wait_done(struct mmc_request *mrq)
+{
+	complete(mrq->done_data);
+}
+
+int mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
+{
+	DECLARE_COMPLETION_ONSTACK(complete);
+
+	mrq->done_data = &complete;
+	mrq->done = mmc_wait_done;
+
+	mmc_start_request(host, mrq);
+
+	wait_for_completion(&complete);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(mmc_wait_for_req);
+
+/**
+ *	mmc_wait_for_cmd - start a command and wait for completion
+ *	@host: MMC host to start command
+ *	@cmd: MMC command to start
+ *	@retries: maximum number of retries
+ *
+ *	Start a new MMC command for a host, and wait for the command
+ *	to complete.  Return any error that occurred while the command
+ *	was executing.  Do not attempt to parse the response.
+ */
+int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
+{
+	struct mmc_request mrq;
+
+	BUG_ON(!host->claimed);
+
+	memset(&mrq, 0, sizeof(struct mmc_request));
+
+	memset(cmd->resp, 0, sizeof(cmd->resp));
+	cmd->retries = retries;
+
+	mrq.cmd = cmd;
+	cmd->data = NULL;
+
+	mmc_wait_for_req(host, &mrq);
+
+	return cmd->error;
+}
+
+EXPORT_SYMBOL(mmc_wait_for_cmd);
+
+/**
+ *	mmc_set_data_timeout - set the timeout for a data command
+ *	@data: data phase for command
+ *	@card: the MMC card associated with the data transfer
+ *	@write: flag to differentiate reads from writes
+ */
+void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
+			  int write)
+{
+	unsigned int mult;
+
+	/*
+	 * SD cards use a 100 multiplier rather than 10
+	 */
+	mult = mmc_card_sd(card) ? 100 : 10;
+
+	/*
+	 * Scale up the multiplier (and therefore the timeout) by
+	 * the r2w factor for writes.
+	 */
+	if (write)
+		mult <<= card->csd.r2w_factor;
+
+	data->timeout_ns = card->csd.tacc_ns * mult;
+	data->timeout_clks = card->csd.tacc_clks * mult;
+
+	/*
+	 * SD cards also have an upper limit on the timeout.
+	 */
+	if (mmc_card_sd(card)) {
+		unsigned int timeout_us, limit_us;
+
+		timeout_us = data->timeout_ns / 1000;
+		timeout_us += data->timeout_clks * 1000 /
+			(card->host->ios.clock / 1000);
+
+		if (write)
+			limit_us = 250000;
+		else
+			limit_us = 100000;
+
+		/*
+		 * SDHC cards always use these fixed values.
+		 */
+		if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
+			data->timeout_ns = limit_us * 1000;
+			data->timeout_clks = 0;
+		}
+	}
+}
+EXPORT_SYMBOL(mmc_set_data_timeout);
+
+/**
+ *	__mmc_claim_host - exclusively claim a host
+ *	@host: mmc host to claim
+ *	@card: mmc card to claim host for
+ *
+ *	Claim a host for a set of operations.  If a valid card
+ *	is passed and this wasn't the last card selected, select
+ *	the card before returning.
+ *
+ *	Note: you should use mmc_card_claim_host or mmc_claim_host.
+ */
+void mmc_claim_host(struct mmc_host *host)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	unsigned long flags;
+
+	add_wait_queue(&host->wq, &wait);
+	spin_lock_irqsave(&host->lock, flags);
+	while (1) {
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		if (!host->claimed)
+			break;
+		spin_unlock_irqrestore(&host->lock, flags);
+		schedule();
+		spin_lock_irqsave(&host->lock, flags);
+	}
+	set_current_state(TASK_RUNNING);
+	host->claimed = 1;
+	spin_unlock_irqrestore(&host->lock, flags);
+	remove_wait_queue(&host->wq, &wait);
+}
+
+EXPORT_SYMBOL(mmc_claim_host);
+
+/**
+ *	mmc_release_host - release a host
+ *	@host: mmc host to release
+ *
+ *	Release a MMC host, allowing others to claim the host
+ *	for their operations.
+ */
+void mmc_release_host(struct mmc_host *host)
+{
+	unsigned long flags;
+
+	BUG_ON(!host->claimed);
+
+	spin_lock_irqsave(&host->lock, flags);
+	host->claimed = 0;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	wake_up(&host->wq);
+}
+
+EXPORT_SYMBOL(mmc_release_host);
+
+/*
+ * Internal function that does the actual ios call to the host driver,
+ * optionally printing some debug output.
+ */
+static inline void mmc_set_ios(struct mmc_host *host)
+{
+	struct mmc_ios *ios = &host->ios;
+
+	pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
+		"width %u timing %u\n",
+		 mmc_hostname(host), ios->clock, ios->bus_mode,
+		 ios->power_mode, ios->chip_select, ios->vdd,
+		 ios->bus_width, ios->timing);
+
+	host->ops->set_ios(host, ios);
+}
+
+/*
+ * Control chip select pin on a host.
+ */
+void mmc_set_chip_select(struct mmc_host *host, int mode)
+{
+	host->ios.chip_select = mode;
+	mmc_set_ios(host);
+}
+
+/*
+ * Sets the host clock to the highest possible frequency that
+ * is below "hz".
+ */
+void mmc_set_clock(struct mmc_host *host, unsigned int hz)
+{
+	WARN_ON(hz < host->f_min);
+
+	if (hz > host->f_max)
+		hz = host->f_max;
+
+	host->ios.clock = hz;
+	mmc_set_ios(host);
+}
+
+/*
+ * Change the bus mode (open drain/push-pull) of a host.
+ */
+void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
+{
+	host->ios.bus_mode = mode;
+	mmc_set_ios(host);
+}
+
+/*
+ * Change data bus width of a host.
+ */
+void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
+{
+	host->ios.bus_width = width;
+	mmc_set_ios(host);
+}
+
+/*
+ * Mask off any voltages we don't support and select
+ * the lowest voltage
+ */
+u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
+{
+	int bit;
+
+	ocr &= host->ocr_avail;
+
+	bit = ffs(ocr);
+	if (bit) {
+		bit -= 1;
+
+		ocr &= 3 << bit;
+
+		host->ios.vdd = bit;
+		mmc_set_ios(host);
+	} else {
+		ocr = 0;
+	}
+
+	return ocr;
+}
+
+/*
+ * Select timing parameters for host.
+ */
+void mmc_set_timing(struct mmc_host *host, unsigned int timing)
+{
+	host->ios.timing = timing;
+	mmc_set_ios(host);
+}
+
+/*
+ * 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,
+ * enable the bus drivers and clock to the card.
+ *
+ * We must _NOT_ enable the clock prior to power stablising.
+ *
+ * If a host does all the power sequencing itself, ignore the
+ * initial MMC_POWER_UP stage.
+ */
+static void mmc_power_up(struct mmc_host *host)
+{
+	int bit = fls(host->ocr_avail) - 1;
+
+	host->ios.vdd = bit;
+	host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+	host->ios.chip_select = MMC_CS_DONTCARE;
+	host->ios.power_mode = MMC_POWER_UP;
+	host->ios.bus_width = MMC_BUS_WIDTH_1;
+	host->ios.timing = MMC_TIMING_LEGACY;
+	mmc_set_ios(host);
+
+	mmc_delay(1);
+
+	host->ios.clock = host->f_min;
+	host->ios.power_mode = MMC_POWER_ON;
+	mmc_set_ios(host);
+
+	mmc_delay(2);
+}
+
+static void mmc_power_off(struct mmc_host *host)
+{
+	host->ios.clock = 0;
+	host->ios.vdd = 0;
+	host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+	host->ios.chip_select = MMC_CS_DONTCARE;
+	host->ios.power_mode = MMC_POWER_OFF;
+	host->ios.bus_width = MMC_BUS_WIDTH_1;
+	host->ios.timing = MMC_TIMING_LEGACY;
+	mmc_set_ios(host);
+}
+
+/*
+ * Assign a mmc bus handler to a host. Only one bus handler may control a
+ * host at any given time.
+ */
+void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
+{
+	unsigned long flags;
+
+	BUG_ON(!host);
+	BUG_ON(!ops);
+
+	BUG_ON(!host->claimed);
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	BUG_ON(host->bus_ops);
+	BUG_ON(host->bus_refs);
+
+	host->bus_ops = ops;
+	host->bus_refs = 1;
+	host->bus_dead = 0;
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+/*
+ * Remove the current bus handler from a host. Assumes that there are
+ * no interesting cards left, so the bus is powered down.
+ */
+void mmc_detach_bus(struct mmc_host *host)
+{
+	unsigned long flags;
+
+	BUG_ON(!host);
+
+	BUG_ON(!host->claimed);
+	BUG_ON(!host->bus_ops);
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	host->bus_dead = 1;
+