mmc: Move core functions to subdir

Create a "core" subdirectory to house the central bus handling
functions.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 1638 insertions, 0 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
new file mode 100644
index 000000000000..334e663e465b
--- /dev/null
+++ b/drivers/mmc/core/core.c
@@ -0,0 +1,1638 @@
+/*
+ *  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/protocol.h>
+
+#include "core.h"
+
+#define CMD_RETRIES	3
+
+/*
+ * OCR Bit positions to 10s of Vdd mV.
+ */
+static const unsigned short mmc_ocr_bit_to_vdd[] = {
+	150,	155,	160,	165,	170,	180,	190,	200,
+	210,	220,	230,	240,	250,	260,	270,	280,
+	290,	300,	310,	320,	330,	340,	350,	360
+};
+
+static const unsigned int tran_exp[] = {
+	10000,		100000,		1000000,	10000000,
+	0,		0,		0,		0
+};
+
+static const unsigned char tran_mant[] = {
+	0,	10,	12,	13,	15,	20,	25,	30,
+	35,	40,	45,	50,	55,	60,	70,	80,
+};
+
+static const unsigned int tacc_exp[] = {
+	1,	10,	100,	1000,	10000,	100000,	1000000, 10000000,
+};
+
+static const unsigned int tacc_mant[] = {
+	0,	10,	12,	13,	15,	20,	25,	30,
+	35,	40,	45,	50,	55,	60,	70,	80,
+};
+
+
+/**
+ *	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_wait_for_app_cmd - start an application command and wait for
+ 			       completion
+ *	@host: MMC host to start command
+ *	@rca: RCA to send MMC_APP_CMD to
+ *	@cmd: MMC command to start
+ *	@retries: maximum number of retries
+ *
+ *	Sends a MMC_APP_CMD, checks the card response, sends the command
+ *	in the parameter and waits for it to complete. Return any error
+ *	that occurred while the command was executing.  Do not attempt to
+ *	parse the response.
+ */
+int mmc_wait_for_app_cmd(struct mmc_host *host, unsigned int rca,
+	struct mmc_command *cmd, int retries)
+{
+	struct mmc_request mrq;
+	struct mmc_command appcmd;
+
+	int i, err;
+
+	BUG_ON(!host->claimed);
+	BUG_ON(retries < 0);
+
+	err = MMC_ERR_INVALID;
+
+	/*
+	 * We have to resend MMC_APP_CMD for each attempt so
+	 * we cannot use the retries field in mmc_command.
+	 */
+	for (i = 0;i <= retries;i++) {
+		memset(&mrq, 0, sizeof(struct mmc_request));
+
+		appcmd.opcode = MMC_APP_CMD;
+		appcmd.arg = rca << 16;
+		appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+		appcmd.retries = 0;
+		memset(appcmd.resp, 0, sizeof(appcmd.resp));
+		appcmd.data = NULL;
+
+		mrq.cmd = &appcmd;
+		appcmd.data = NULL;
+
+		mmc_wait_for_req(host, &mrq);
+
+		if (appcmd.error) {
+			err = appcmd.error;
+			continue;
+		}
+
+		/* Check that card supported application commands */
+		if (!(appcmd.resp[0] & R1_APP_CMD))
+			return MMC_ERR_FAILED;
+
+		memset(&mrq, 0, sizeof(struct mmc_request));
+
+		memset(cmd->resp, 0, sizeof(cmd->resp));
+		cmd->retries = 0;
+
+		mrq.cmd = cmd;
+		cmd->data = NULL;
+
+		mmc_wait_for_req(host, &mrq);
+
+		err = cmd->error;
+		if (cmd->error == MMC_ERR_NONE)
+			break;
+	}
+
+	return err;
+}
+
+EXPORT_SYMBOL(mmc_wait_for_app_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);
+
+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);
+}
+
+static int mmc_select_card(struct mmc_card *card)
+{
+	int err;
+	struct mmc_command cmd;
+
+	BUG_ON(!card->host->claimed);
+
+	cmd.opcode = MMC_SELECT_CARD;
+	cmd.arg = card->rca << 16;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+	err = mmc_wait_for_cmd(card->host, &cmd, CMD_RETRIES);
+	if (err != MMC_ERR_NONE)
+		return err;
+
+	/*
+	 * We can only change the bus width of SD cards when
+	 * they are selected so we have to put the handling
+	 * here.
+	 *
+	 * The card is in 1 bit mode by default so
+	 * we only need to change if it supports the
+	 * wider version.
+	 */
+	if (mmc_card_sd(card) &&
+		(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) &&
+		(card->host->caps & MMC_CAP_4_BIT_DATA)) {
+
+		struct mmc_command cmd;
+		cmd.opcode = SD_APP_SET_BUS_WIDTH;
+		cmd.arg = SD_BUS_WIDTH_4;
+		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+		err = mmc_wait_for_app_cmd(card->host, card->rca,
+			&cmd, CMD_RETRIES);
+		if (err != MMC_ERR_NONE)
+			return err;
+
+		card->host->ios.bus_width = MMC_BUS_WIDTH_4;
+		mmc_set_ios(card->host);
+	}
+
+	return MMC_ERR_NONE;
+}
+
+
+static inline void mmc_delay(unsigned int ms)
+{
+	if (ms < 1000 / HZ) {
+		cond_resched();
+		mdelay(ms);
+	} else {
+		msleep(ms);
+	}
+}
+
+/*
+ * Mask off any voltages we don't support and select
+ * the lowest voltage
+ */
+static 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;
+}
+
+#define UNSTUFF_BITS(resp,start,size)					\
+	({								\
+		const int __size = size;				\
+		const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1;	\
+		const int __off = 3 - ((start) / 32);			\
+		const int __shft = (start) & 31;			\
+		u32 __res;						\
+									\
+		__res = resp[__off] >> __shft;				\
+		if (__size + __shft > 32)				\
+			__res |= resp[__off-1] << ((32 - __shft) % 32);	\
+		__res & __mask;						\
+	})
+
+/*
+ * Given the decoded CSD structure, decode the raw CID to our CID structure.
+ */
+static void mmc_decode_cid(struct mmc_card *card)
+{
+	u32 *resp = card->raw_cid;
+
+	memset(&card->cid, 0, sizeof(struct mmc_cid));
+
+	if (mmc_card_sd(card)) {
+		/*
+		 * SD doesn't currently have a version field so we will
+		 * have to assume we can parse this.
+		 */
+		card->cid.manfid		= UNSTUFF_BITS(resp, 120, 8);
+		card->cid.oemid			= UNSTUFF_BITS(resp, 104, 16);
+		card->cid.prod_name[0]		= UNSTUFF_BITS(resp, 96, 8);
+		card->cid.prod_name[1]		= UNSTUFF_BITS(resp, 88, 8);
+		card->cid.prod_name[2]		= UNSTUFF_BITS(resp, 80, 8);
+		card->cid.prod_name[3]		= UNSTUFF_BITS(resp, 72, 8);
+		card->cid.prod_name[4]		= UNSTUFF_BITS(resp, 64, 8);
+		card->cid.hwrev			= UNSTUFF_BITS(resp, 60, 4);
+		card->cid.fwrev			= UNSTUFF_BITS(resp, 56, 4);
+		card->cid.serial		= UNSTUFF_BITS(resp, 24, 32);
+		card->cid.year			= UNSTUFF_BITS(resp, 12, 8);
+		card->cid.month			= UNSTUFF_BITS(resp, 8, 4);
+
+		card->cid.year += 2000; /* SD cards year offset */
+	} else {
+		/*
+		 * The selection of the format here is based upon published
+		 * specs from sandisk and from what people have reported.
+		 */
+		switch (card->csd.mmca_vsn) {
+		case 0: /* MMC v1.0 - v1.2 */
+		case 1: /* MMC v1.4 */
+			card->cid.manfid	= UNSTUFF_BITS(resp, 104, 24);
+			card->cid.prod_name[0]	= UNSTUFF_BITS(resp, 96, 8);
+			card->cid.prod_name[1]	= UNSTUFF_BITS(resp, 88, 8);
+			card->cid.prod_name[2]	= UNSTUFF_BITS(resp, 80, 8);
+			card->cid.prod_name[3]	= UNSTUFF_BITS(resp, 72, 8);
+			card->cid.prod_name[4]	= UNSTUFF_BITS(resp, 64, 8);
+			card->cid.prod_name[5]	= UNSTUFF_BITS(resp, 56, 8);
+			card->cid.prod_name[6]	= UNSTUFF_BITS(resp, 48, 8);
+			card->cid.hwrev		= UNSTUFF_BITS(resp, 44, 4);
+			card->cid.fwrev		= UNSTUFF_BITS(resp, 40, 4);
+			card->cid.serial	= UNSTUFF_BITS(resp, 16, 24);
+			card->cid.month		= UNSTUFF_BITS(resp, 12, 4);
+			card->cid.year		= UNSTUFF_BITS(resp, 8, 4) + 1997;
+			break;
+
+		case 2: /* MMC v2.0 - v2.2 */
+		case 3: /* MMC v3.1 - v3.3 */
+		case 4: /* MMC v4 */
+			card->cid.manfid	= UNSTUFF_BITS(resp, 120, 8);
+			card->cid.oemid		= UNSTUFF_BITS(resp, 104, 16);
+			card->cid.prod_name[0]	= UNSTUFF_BITS(resp, 96, 8);
+			card->cid.prod_name[1]	= UNSTUFF_BITS(resp, 88, 8);
+			card->cid.prod_name[2]	= UNSTUFF_BITS(resp, 80, 8);
+			card->cid.prod_name[3]	= UNSTUFF_BITS(resp, 72, 8);
+			card->cid.prod_name[4]	= UNSTUFF_BITS(resp, 64, 8);
+			card->cid.prod_name[5]	= UNSTUFF_BITS(resp, 56, 8);
+			card->cid.serial	= UNSTUFF_BITS(resp, 16, 32);
+			card->cid.month		= UNSTUFF_BITS(resp, 12, 4);
+			card->cid.year		= UNSTUFF_BITS(resp, 8, 4) + 1997;
+			break;
+
+		default:
+			printk("%s: card has unknown MMCA version %d\n",
+				mmc_hostname(card->host), card->csd.mmca_vsn);
+			mmc_card_set_bad(card);
+			break;
+		}
+	}
+}
+
+/*
+ * Given a 128-bit response, decode to our card CSD structure.
+ */
+static void mmc_decode_csd(struct mmc_card *card)
+{
+	struct mmc_csd *csd = &card->csd;
+	unsigned int e, m, csd_struct;
+	u32 *resp = card->raw_csd;
+
+	if (mmc_card_sd(card)) {
+		csd_struct = UNSTUFF_BITS(resp, 126, 2);
+
+		switch (csd_struct) {
+		case 0:
+			m = UNSTUFF_BITS(resp, 115, 4);
+			e = UNSTUFF_BITS(resp, 112, 3);
+			csd->tacc_ns	 = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
+			csd->tacc_clks	 = UNSTUFF_BITS(resp, 104, 8) * 100;
+
+			m = UNSTUFF_BITS(resp, 99, 4);
+			e = UNSTUFF_BITS(resp, 96, 3);
+			csd->max_dtr	  = tran_exp[e] * tran_mant[m];
+			csd->cmdclass	  = UNSTUFF_BITS(resp, 84, 12);
+
+			e = UNSTUFF_BITS(resp, 47, 3);
+			m = UNSTUFF_BITS(resp, 62, 12);
+			csd->capacity	  = (1 + m) << (e + 2);
+
+			csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
+			csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
+			csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
+			csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
+			csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
+			csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
+			csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
+			break;
+		case 1:
+			/*
+			 * This is a block-addressed SDHC card. Most
+			 * interesting fields are unused and have fixed
+			 * values. To avoid getting tripped by buggy cards,
+			 * we assume those fixed values ourselves.
+			 */
+			mmc_card_set_blockaddr(card);
+
+			csd->tacc_ns	 = 0; /* Unused */
+			csd->tacc_clks	 = 0; /* Unused */
+
+			m = UNSTUFF_BITS(resp, 99, 4);
+			e = UNSTUFF_BITS(resp, 96, 3);
+			csd->max_dtr	  = tran_exp[e] * tran_mant[m];
+			csd->cmdclass	  = UNSTUFF_BITS(resp, 84, 12);
+
+			m = UNSTUFF_BITS(resp, 48, 22);
+			csd->capacity     = (1 + m) << 10;
+
+			csd->read_blkbits = 9;
+			csd->read_partial = 0;
+			csd->write_misalign = 0;
+			csd->read_misalign = 0;
+			csd->r2w_factor = 4; /* Unused */
+			csd->write_blkbits = 9;
+			csd->write_partial = 0;
+			break;
+		default:
+			printk("%s: unrecognised CSD structure version %d\n",
+				mmc_hostname(card->host), csd_struct);
+			mmc_card_set_bad(card);
+			return;
+		}
+	} else {
+		/*
+		 * We only understand CSD structure v1.1 and v1.2.
+		 * v1.2 has extra information in bits 15, 11 and 10.
+		 */
+		csd_struct = UNSTUFF_BITS(resp, 126, 2);
+		if (csd_struct != 1 && csd_struct != 2) {
+			printk("%s: unrecognised CSD structure version %d\n",
+				mmc_hostname(card->host), csd_struct);
+			mmc_card_set_bad(card);
+			return;
+		}
+
+		csd->mmca_vsn	 = UNSTUFF_BITS(resp, 122, 4);
+		m = UNSTUFF_BITS(resp, 115, 4);
+		e = UNSTUFF_BITS(resp, 112, 3);
+		csd->tacc_ns	 = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
+		csd->tacc_clks	 = UNSTUFF_BITS(resp, 104, 8) * 100;
+
+		m = UNSTUFF_BITS(resp, 99, 4);
+		e = UNSTUFF_BITS(resp, 96, 3);
+		csd->max_dtr	  = tran_exp[e] * tran_mant[m];
+		csd->cmdclass	  = UNSTUFF_BITS(resp, 84, 12);
+
+		e = UNSTUFF_BITS(resp, 47, 3);
+		m = UNSTUFF_BITS(resp, 62, 12);
+		csd->capacity	  = (1 + m) << (e + 2);
+
+		csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
+		csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
+		csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
+		csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
+		csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
+		csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
+		csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
+	}
+}
+
+/*
+ * Given a 64-bit response, decode to our card SCR structure.
+ */
+static void mmc_decode_scr(struct mmc_card *card)
+{
+	struct sd_scr *scr = &card->scr;
+	unsigned int scr_struct;
+	u32 resp[4];
+
+	BUG_ON(!mmc_card_sd(card));
+
+	resp[3] = card->raw_scr[1];
+	resp[2] = card->raw_scr[0];
+
+	scr_struct = UNSTUFF_BITS(resp, 60, 4);
+	if (scr_struct != 0) {
+		printk("%s: unrecognised SCR structure version %d\n",
+			mmc_hostname(card->host), scr_struct);
+		mmc_card_set_bad(card);
+		return;
+	}
+
+	scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
+	scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
+}
+
+/*
+ * Allocate a new MMC card
+ */
+static struct mmc_card *
+mmc_alloc_card(struct mmc_host *host, u32 *raw_cid)
+{
+	struct mmc_card *card;
+
+	card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
+	if (!card)
+		return ERR_PTR(-ENOMEM);
+
+	mmc_init_card(card, host);
+	memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
+
+	return card;
+}
+
+/*
+ * Tell attached cards to go to IDLE state
+ */
+static void mmc_idle_cards(struct mmc_host *host)
+{
+	struct mmc_command cmd;
+
+	host->ios.chip_select = MMC_CS_HIGH;
+	mmc_set_ios(host);
+
+	mmc_delay(1);
+
+	cmd.opcode = MMC_GO_IDLE_STATE;
+	cmd.arg = 0;
+	cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
+
+	mmc_wait_for_cmd(host, &cmd, 0);
+
+	mmc_delay(1);
+
+	host->ios.chip_select = MMC_CS_DONTCARE;
+	mmc_set_ios(host);
+
+	mmc_delay(1);
+}
+
+/*
+ * 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);
+}
+
+static int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
+{
+	struct mmc_command cmd;
+	int i, err = 0;
+
+	cmd.opcode = MMC_SEND_OP_COND;
+	cmd.arg = ocr;
+	cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
+
+	for (i = 100; i; i--) {
+		err = mmc_wait_for_cmd(host, &cmd, 0);
+		if (err != MMC_ERR_NONE)
+			break;
+
+		if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
+			break;
+
+		err = MMC_ERR_TIMEOUT;
+
+		mmc_delay(10);
+	}
+
+	if (rocr)
+		*rocr = cmd.resp[0];
+
+	return err;
+}
+
+static int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
+{
+	struct mmc_command cmd;
+	int i, err = 0;
+
+	cmd.opcode = SD_APP_OP_COND;
+	cmd.arg = ocr;
+	cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
+
+	for (i = 100; i; i--) {
+		err = mmc_wait_for_app_cmd(host, 0, &cmd, CMD_RETRIES);
+		if (err != MMC_ERR_NONE)
+			break;
+
+		if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
+			break;
+
+		err = MMC_ERR_TIMEOUT;
+
+		mmc_delay(10);
+	}
+
+	if (rocr)
+		*rocr = cmd.resp[0];
+
+	return err;
+}
+
+static int mmc_send_if_cond(struct mmc_host *host, u32 ocr, int *rsd2)
+{
+	struct mmc_command cmd;
+	int err, sd2;
+	static const u8 test_pattern = 0xAA;
+
+	/*
+	* To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
+	* before SD_APP_OP_COND. This command will harmlessly fail for
+	* SD 1.0 cards.
+	*/
+	cmd.opcode = SD_SEND_IF_COND;
+	cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
+	cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if (err == MMC_ERR_NONE) {
+		if ((cmd.resp[0] & 0xFF) == test_pattern) {
+			sd2 = 1;
+		} else {
+			sd2 = 0;
+			err = MMC_ERR_FAILED;
+		}
+	} else {
+		/*
+		 * Treat errors as SD 1.0 card.
+		 */
+		sd2 = 0;
+		err = MMC_ERR_NONE;
+	}
+	if (rsd2)
+		*rsd2 = sd2;
+	return err;
+}
+
+/*
+ * Discover the card by requesting its CID.
+ *
+ * Create a mmc_card entry for the discovered card, assigning
+ * it an RCA, and save the raw CID for decoding later.
+ */
+static void mmc_discover_card(struct mmc_host *host)
+{
+	unsigned int err;
+
+	struct mmc_command cmd;
+
+	BUG_ON(host->card);
+
+	cmd.opcode = MMC_ALL_SEND_CID;
+	cmd.arg = 0;
+	cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
+
+	err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+	if (err == MMC_ERR_TIMEOUT) {
+		err = MMC_ERR_NONE;
+		return;
+	}
+	if (err != MMC_ERR_NONE) {
+		printk(KERN_ERR "%s: error requesting CID: %d\n",
+			mmc_hostname(host), err);
+		return;
+	}
+
+	host->card = mmc_alloc_card(host, cmd.resp);
+	if (IS_ERR(host->card)) {
+		err = PTR_ERR(host->card);
+		host->card = NULL;
+		return;
+	}
+
+	if (host->mode == MMC_MODE_SD) {
+		host->card->type = MMC_TYPE_SD;
+
+		cmd.opcode = SD_SEND_RELATIVE_ADDR;
+		cmd.arg = 0;
+		cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
+
+		err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+		if (err != MMC_ERR_NONE)
+			mmc_card_set_dead(host->card);
+		else {
+			host->card->rca = cmd.resp[0] >> 16;
+
+			if (!host->ops->get_ro) {
+				printk(KERN_WARNING "%s: host does not "
+					"support reading read-only "
+					"switch. assuming write-enable.\n",
+					mmc_hostname(host));
+			} else {
+				if (host->ops->get_ro(host))
+					mmc_card_set_readonly(host->card);
+			}
+		}
+	} else {
+		host->card->type = MMC_TYPE_MMC;
+		host->card->rca = 1;
+
+		cmd.opcode = MMC_SET_RELATIVE_ADDR;
+		cmd.arg = host->card->rca << 16;
+		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+		err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+		if (err != MMC_ERR_NONE)
+			mmc_card_set_dead(host->card);
+	}
+}
+
+static void mmc_read_csd(struct mmc_host *host)
+{
+	struct mmc_command cmd;
+	int err;
+
+	if (!host->card)
+		return;
+	if (mmc_card_dead(host->card))
+		return;
+
+	cmd.opcode = MMC_SEND_CSD;
+	cmd.arg = host->card->rca << 16;
+	cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
+
+	err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+	if (err != MMC_ERR_NONE) {
+		mmc_card_set_dead(host->card);
+		return;
+	}
+
+	memcpy(host->card->raw_csd, cmd.resp, sizeof(host->card->raw_csd));
+
+	mmc_decode_csd(host->card);
+	mmc_decode_cid(host->card);
+}
+
+static void mmc_process_ext_csd(struct mmc_host *host)
+{
+	int err;
+
+	struct mmc_request mrq;
+	struct mmc_command cmd;
+	struct mmc_data data;
+
+	u8 *ext_csd;
+	struct scatterlist sg;
+
+	if (!host->card)
+		return;
+	if (mmc_card_dead(host->card))
+		return;
+	if (mmc_card_sd(host->card))
+		return;
+	if (host->card->csd.mmca_vsn < CSD_SPEC_VER_4)
+		return;
+
+	/*
+	 * As the ext_csd is so large and mostly unused, we don't store the
+	 * raw block in mmc_card.
+	 */
+	ext_csd = kmalloc(512, GFP_KERNEL);
+	if (!ext_csd) {
+		printk("%s: could not allocate a buffer to receive the ext_csd."
+		       "mmc v4 cards will be treated as v3.\n",
+			mmc_hostname(host));
+		return;
+	}
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = MMC_SEND_EXT_CSD;
+	cmd.arg = 0;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+
+	memset(&data, 0, sizeof(struct mmc_data));
+
+	mmc_set_data_timeout(&data, host->card, 0);
+
+	data.blksz = 512;
+	data.blocks = 1;
+	data.flags = MMC_DATA_READ;
+	data.sg = &sg;
+	data.sg_len = 1;
+
+	memset(&mrq, 0, sizeof(struct mmc_request));
+
+	mrq.cmd = &cmd;
+	mrq.data = &data;
+
+	sg_init_one(&sg, ext_csd, 512);
+
+	mmc_wait_for_req(host, &mrq);
+
+	if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
+		if (host->card->csd.capacity == (4096 * 512)) {
+			printk(KERN_ERR "%s: unable to read EXT_CSD "
+				"on a possible high capacity card. "
+				"Card will be ignored.\n",
+				mmc_hostname(host));
+			mmc_card_set_dead(host->card);
+		} else {
+			printk(KERN_WARNING "%s: unable to read "
+				"EXT_CSD, performance might "
+				"suffer.\n",
+				mmc_hostname(host));
+		}
+		goto out;
+	}
+
+	host->card->ext_csd.sectors =
+		ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
+		ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
+		ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
+		ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
+	if (host->card->ext_csd.sectors)
+		mmc_card_set_blockaddr(host->card);
+
+	switch (ext_csd[EXT_CSD_CARD_TYPE]) {
+	case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
+		host->card->ext_csd.hs_max_dtr = 52000000;
+		break;
+	case EXT_CSD_CARD_TYPE_26:
+		host->card->ext_csd.hs_max_dtr = 26000000;
+		break;
+	default:
+		/* MMC v4 spec says this cannot happen */
+		printk("%s: card is mmc v4 but doesn't support "
+		       "any high-speed modes.\n",
+			mmc_hostname(host));
+		goto out;
+	}
+
+	if (host->caps & MMC_CAP_MMC_HIGHSPEED) {
+		/* Activate highspeed support. */
+		cmd.opcode = MMC_SWITCH;
+		cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
+			  (EXT_CSD_HS_TIMING << 16) |
+			  (1 << 8) |
+			  EXT_CSD_CMD_SET_NORMAL;
+		cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+
+		err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+		if (err != MMC_ERR_NONE) {
+			printk("%s: failed to switch card to mmc v4 "
+			       "high-speed mode.\n",
+			       mmc_hostname(host));
+			goto out;
+		}
+
+		mmc_card_set_highspeed(host->card);
+
+		host->ios.timing = MMC_TIMING_MMC_HS;
+		mmc_set_ios(host);
+	}
+
+	/* Check for host support for wide-bus modes. */
+	if (host->caps & MMC_CAP_4_BIT_DATA) {
+		/* Activate 4-bit support. */
+		cmd.opcode = MMC_SWITCH;
+		cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
+			  (EXT_CSD_BUS_WIDTH << 16) |
+			  (EXT_CSD_BUS_WIDTH_4 << 8) |
+			  EXT_CSD_CMD_SET_NORMAL;
+		cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+
+		err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
+		if (err != MMC_ERR_NONE) {
+			printk("%s: failed to switch card to "
+			       "mmc v4 4-bit bus mode.\n",
+			       mmc_hostname(host));
+			goto out;
+		}
+
+		host->ios.bus_width = MMC_BUS_WIDTH_4;
+		mmc_set_ios(host);
+	}
+
+out:
+	kfree(ext_csd);
+}
+
+static void mmc_read_scr(struct mmc_host *host)
+{
+	int err;
+	struct mmc_request mrq;
+	struct mmc_command cmd;
+	struct mmc_data data;
+	struct scatterlist sg;
+
+	if (!host->card)
+		return;
+	if (mmc_card_dead(host->card))
+		return;
+	if (!mmc_card_sd(host->card))
+		return;
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = MMC_APP_CMD;
+	cmd.arg = host->card->rca << 16;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD)) {
+		mmc_card_set_dead(host->card);
+		return;
+	}
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = SD_APP_SEND_SCR;
+	cmd.arg = 0;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+
+	memset(&data, 0, sizeof(struct mmc_data));
+
+	mmc_set_data_timeout(&data, host->card, 0);
+
+	data.blksz = 1 << 3;
+	data.blocks = 1;
+	data.flags = MMC_DATA_READ;
+	data.sg = &sg;
+	data.sg_len = 1;
+
+	memset(&mrq, 0, sizeof(struct mmc_request));
+
+	mrq.cmd = &cmd;
+	mrq.data = &data;
+
+	sg_init_one(&sg, (u8*)host->card->raw_scr, 8);
+
+	mmc_wait_for_req(host, &mrq);
+
+	if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
+		mmc_card_set_dead(host->card);
+		return;
+	}
+
+	host->card->raw_scr[0] = ntohl(host->card->raw_scr[0]);
+	host->card->raw_scr[1] = ntohl(host->card->raw_scr[1]);
+
+	mmc_decode_scr(host->card);
+}
+
+static void mmc_read_switch_caps(struct mmc_host *host)
+{
+	struct mmc_request mrq;
+	struct mmc_command cmd;
+	struct mmc_data data;
+	unsigned char *status;
+	struct scatterlist sg;
+
+	if (!(host->caps & MMC_CAP_SD_HIGHSPEED))
+		return;
+
+	if (!host->card)
+		return;
+	if (mmc_card_dead(host->card))
+		return;
+	if (!mmc_card_sd(host->card))
+		return;
+	if (host->card->scr.sda_vsn < SCR_SPEC_VER_1)
+		return;
+
+	status = kmalloc(64, GFP_KERNEL);
+	if (!status) {
+		printk(KERN_WARNING "%s: Unable to allocate buffer for "
+			"reading switch capabilities.\n",
+			mmc_hostname(host));
+		return;
+	}
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = SD_SWITCH;
+	cmd.arg = 0x00FFFFF1;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+
+	memset(&data, 0, sizeof(struct mmc_data));
+
+	mmc_set_data_timeout(&data, host->card, 0);
+
+	data.blksz = 64;
+	data.blocks = 1;
+	data.flags = MMC_DATA_READ;
+	data.sg = &sg;
+	data.sg_len = 1;
+
+	memset(&mrq, 0, sizeof(struct mmc_request));
+
+	mrq.cmd = &cmd;
+	mrq.data = &data;
+
+	sg_init_one(&sg, status, 64);
+
+	mmc_wait_for_req(host, &mrq);
+
+	if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
+		printk("%s: unable to read switch capabilities, "
+			"performance might suffer.\n",
+			mmc_hostname(host));
+		goto out;
+	}
+
+	if (status[13] & 0x02)
+		host->card->sw_caps.hs_max_dtr = 50000000;
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = SD_SWITCH;
+	cmd.arg = 0x80FFFFF1;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+
+	memset(&data, 0, sizeof(struct mmc_data));
+
+	mmc_set_data_timeout(&data, host->card, 0);
+
+	data.blksz = 64;
+	data.blocks = 1;
+	data.flags = MMC_DATA_READ;
+	data.sg = &sg;
+	data.sg_len = 1;
+
+	memset(&mrq, 0, sizeof(struct mmc_request));
+
+	mrq.cmd = &cmd;
+	mrq.data = &data;
+
+	sg_init_one(&sg, status, 64);
+
+	mmc_wait_for_req(host, &mrq);
+
+	if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE ||
+		(status[16] & 0xF) != 1) {
+		printk(KERN_WARNING "%s: Problem switching card "
+			"into high-speed mode!\n",
+			mmc_hostname(host));
+		goto out;
+	}
+
+	mmc_card_set_highspeed(host->card);
+
+	host->ios.timing = MMC_TIMING_SD_HS;
+	mmc_set_ios(host);
+
+out:
+	kfree(status);
+}
+
+static unsigned int mmc_calculate_clock(struct mmc_host *host)
+{
+	unsigned int max_dtr = host->f_max;
+
+	if (host->card && !mmc_card_dead(host->card)) {
+		if (mmc_card_highspeed(host->card) && mmc_card_sd(host->card)) {
+			if (max_dtr > host->card->sw_caps.hs_max_dtr)
+				max_dtr = host->card->sw_caps.hs_max_dtr;
+		} else if (mmc_card_highspeed(host->card) && !mmc_card_sd(host->card)) {
+			if (max_dtr > host->card->ext_csd.hs_max_dtr)
+				max_dtr = host->card->ext_csd.hs_max_dtr;
+		} else if (max_dtr > host->card->csd.max_dtr) {
+			max_dtr = host->card->csd.max_dtr;
+		}
+	}
+
+	pr_debug("%s: selected %d.%03dMHz transfer rate\n",
+		 mmc_hostname(host),
+		 max_dtr / 1000000, (max_dtr / 1000) % 1000);
+
+	return max_dtr;
+}
+
+/*
+ * Check whether cards we already know about are still present.
+ * We do this by requesting status, and checking whether a card
+ * responds.
+ *
+ * A request for status does not cause a state change in data
+ * transfer mode.
+ */
+static void mmc_check_card(struct mmc_card *card)
+{
+	struct mmc_command cmd;
+	int err;
+
+	BUG_ON(!card);
+
+	cmd.opcode = MMC_SEND_STATUS;
+	cmd.arg = card->rca << 16;
+	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+	err = mmc_wait_for_cmd(card->host, &cmd, CMD_RETRIES);
+	if (err == MMC_ERR_NONE)
+		return;
+
+	mmc_card_set_dead(card);
+}
+
+static void mmc_setup(struct mmc_host *host)
+{
+	int err;
+	u32 ocr;
+
+	host->mode = MMC_MODE_SD;
+
+	mmc_power_up(host);
+	mmc_idle_cards(host);
+
+	err = mmc_send_if_cond(host, host->ocr_avail, NULL);
+	if (err != MMC_ERR_NONE) {
+		return;
+	}
+	err = mmc_send_app_op_cond(host, 0, &ocr);
+
+	/*
+	 * If we fail to detect any SD cards then try
+	 * searching for MMC cards.
+	 */
+	if (err != MMC_ERR_NONE) {
+		host->mode = MMC_MODE_MMC;
+
+		err = mmc_send_op_cond(host, 0, &ocr);
+		if (err != MMC_ERR_NONE)
+			return;
+	}
+
+	host->ocr = mmc_select_voltage(host, ocr);
+
+	if (host->ocr == 0)
+		return;
+
+	/*
+	 * Since we're changing the OCR value, we seem to
+	 * need to tell some cards to go back to the idle
+	 * state.  We wait 1ms to give cards time to
+	 * respond.
+	 */
+	mmc_idle_cards(host);
+
+	/*
+	 * Send the selected OCR multiple times... until the cards
+	 * all get the idea that they should be ready for CMD2.
+	 * (My SanDisk card seems to need this.)
+	 */
+	if (host->mode == MMC_MODE_SD) {
+		int err, sd2;
+		err = mmc_send_if_cond(host, host->ocr, &sd2);
+		if (err == MMC_ERR_NONE) {
+			/*
+			* If SD_SEND_IF_COND indicates an SD 2.0
+			* compliant card and we should set bit 30
+			* of the ocr to indicate that we can handle
+			* block-addressed SDHC cards.
+			*/
+			mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);
+		}
+	} else {
+		/* The extra bit indicates that we support high capacity */
+		mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
+	}
+
+	mmc_discover_card(host);
+
+	/*
+	 * Ok, now switch to push-pull mode.
+	 */
+	host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
+	mmc_set_ios(host);
+
+	mmc_read_csd(host);
+
+	if (host->card && !mmc_card_dead(host->card)) {
+		err = mmc_select_card(host->card);
+		if (err != MMC_ERR_NONE)
+			mmc_card_set_dead(host->card);
+	}
+
+	if (host->mode == MMC_MODE_SD) {
+		mmc_read_scr(host);
+		mmc_read_switch_caps(host);
+	} else
+		mmc_process_ext_csd(host);
+}
+
+
+/**
+ *	mmc_detect_change - process change of state on a MMC socket
+ *	@host: host which changed state.
+ *	@delay: optional delay to wait before detection (jiffies)
+ *
+ *	All we know is that card(s) have been inserted or removed
+ *	from the socket(s).  We don't know which socket or cards.
+ */
+void mmc_detect_change(struct mmc_host *host, unsigned long delay)
+{
+#ifdef CONFIG_MMC_DEBUG
+	mmc_claim_host(host);
+	BUG_ON(host->removed);
+	mmc_release_host(host);
+#endif
+
+	mmc_schedule_delayed_work(&host->detect, delay);
+}
+
+EXPORT_SYMBOL(mmc_detect_change);
+
+
+static void mmc_rescan(struct work_struct *work)
+{
+	struct mmc_host *host =
+		container_of(work, struct mmc_host, detect.work);
+
+	mmc_claim_host(host);
+
+	/*
+	 * Check for removed card and newly inserted ones. We check for
+	 * removed cards first so we can intelligently re-select the VDD.
+	 */
+	if (host->card) {
+		mmc_check_card(host->card);
+
+		mmc_release_host(host);
+
+		if (mmc_card_dead(host->card)) {
+			mmc_remove_card(host->card);
+			host->card = NULL;
+		}
+
+		goto out;
+	}
+
+	mmc_setup(host);
+
+	if (host->card && !mmc_card_dead(host->card)) {
+		/*
+		 * (Re-)calculate the fastest clock rate which the
+		 * attached cards and the host support.
+		 */
+		host->ios.clock = mmc_calculate_clock(host);
+		mmc_set_ios(host);
+	}
+
+	mmc_release_host(host);
+
+	/*
+	 * If this is a new and good card, register it.
+	 */
+	if (host->card && !mmc_card_dead(host->card)) {
+		if (mmc_register_card(host->card))
+			mmc_card_set_dead(host->card);
+	}
+
+	/*
+	 * If this card is dead, destroy it.
+	 */
+	if (host->card && mmc_card_dead(host->card)) {
+		mmc_remove_card(host->card);
+		host->card = NULL;
+	}
+
+out:
+	/*
+	 * If we discover that there are no cards on the
+	 * bus, turn off the clock and power down.
+	 */
+	if (!host->card)
+		mmc_power_off(host);
+}
+
+
+/**
+ *	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 = 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;
+}
+
+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)
+{
+#ifdef CONFIG_MMC_DEBUG
+	mmc_claim_host(host);
+	host->removed = 1;
+	mmc_release_host(host);
+#endif
+
+	mmc_flush_scheduled_work();
+
+	if (host->card) {
+		mmc_remove_card(host->card);
+		host->card = NULL;
+	}
+
+	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
+
+/**
+ *	mmc_suspend_host - suspend a host
+ *	@host: mmc host
+ *	@state: suspend mode (PM_SUSPEND_xxx)
+ */
+int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
+{
+	mmc_flush_scheduled_work();
+
+	if (host->card) {
+		mmc_remove_card(host->card);
+		host->card = NULL;
+	}
+
+	mmc_power_off(host);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(mmc_suspend_host);
+
+/**
+ *	mmc_resume_host - resume a previously suspended host
+ *	@host: mmc host
+ */
+int mmc_resume_host(struct mmc_host *host)
+{
+	mmc_rescan(&host->detect.work);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(mmc_resume_host);
+
+#endif
+
+MODULE_LICENSE("GPL");