[linux-block.git] / drivers / mmc / core / mmc.c

/*
 *  linux/drivers/mmc/core/mmc.c
 *
 *  Copyright (C) 2003-2004 Russell King, 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/err.h>
#include <linux/slab.h>

#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>

#include "core.h"
#include "bus.h"
#include "mmc_ops.h"

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,
};

#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 int mmc_decode_cid(struct mmc_card *card)
{
	u32 *resp = card->raw_cid;

	/*
	 * 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(KERN_ERR "%s: card has unknown MMCA version %d\n",
			mmc_hostname(card->host), card->csd.mmca_vsn);
		return -EINVAL;
	}

	return 0;
}

/*
 * Given a 128-bit response, decode to our card CSD structure.
 */
static int mmc_decode_csd(struct mmc_card *card)
{
	struct mmc_csd *csd = &card->csd;
	unsigned int e, m, csd_struct;
	u32 *resp = card->raw_csd;

	/*
	 * 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(KERN_ERR "%s: unrecognised CSD structure version %d\n",
			mmc_hostname(card->host), csd_struct);
		return -EINVAL;
	}

	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);

	return 0;
}

/*
 * Read and decode extended CSD.
 */
static int mmc_read_ext_csd(struct mmc_card *card)
{
	int err;
	u8 *ext_csd;

	BUG_ON(!card);

	if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
		return 0;

	/*
	 * 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(KERN_ERR "%s: could not allocate a buffer to "
			"receive the ext_csd.\n", mmc_hostname(card->host));
		return -ENOMEM;
	}

	err = mmc_send_ext_csd(card, ext_csd);
	if (err) {
		/* If the host or the card can't do the switch,
		 * fail more gracefully. */
		if ((err != -EINVAL)
		 && (err != -ENOSYS)
		 && (err != -EFAULT))
			goto out;

		/*
		 * High capacity cards should have this "magic" size
		 * stored in their CSD.
		 */
		if (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(card->host));
		} else {
			printk(KERN_WARNING "%s: unable to read "
				"EXT_CSD, performance might "
				"suffer.\n",
				mmc_hostname(card->host));
			err = 0;
		}

		goto out;
	}

	card->ext_csd.rev = ext_csd[EXT_CSD_REV];
	if (card->ext_csd.rev > 5) {
		printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
			"version %d\n", mmc_hostname(card->host),
			card->ext_csd.rev);
		err = -EINVAL;
		goto out;
	}

	if (card->ext_csd.rev >= 2) {
		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 (card->ext_csd.sectors)
			mmc_card_set_blockaddr(card);
	}

	switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
	case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
		card->ext_csd.hs_max_dtr = 52000000;
		break;
	case EXT_CSD_CARD_TYPE_26:
		card->ext_csd.hs_max_dtr = 26000000;
		break;
	default:
		/* MMC v4 spec says this cannot happen */
		printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
			"support any high-speed modes.\n",
			mmc_hostname(card->host));
	}

	if (card->ext_csd.rev >= 3) {
		u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];

		/* Sleep / awake timeout in 100ns units */
		if (sa_shift > 0 && sa_shift <= 0x17)
			card->ext_csd.sa_timeout =
					1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
	}

out:
	kfree(ext_csd);

	return err;
}

MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	card->raw_cid[2], card->raw_cid[3]);
MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	card->raw_csd[2], card->raw_csd[3]);
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);

static struct attribute *mmc_std_attrs[] = {
	&dev_attr_cid.attr,
	&dev_attr_csd.attr,
	&dev_attr_date.attr,
	&dev_attr_fwrev.attr,
	&dev_attr_hwrev.attr,
	&dev_attr_manfid.attr,
	&dev_attr_name.attr,
	&dev_attr_oemid.attr,
	&dev_attr_serial.attr,
	NULL,
};

static struct attribute_group mmc_std_attr_group = {
	.attrs = mmc_std_attrs,
};

static const struct attribute_group *mmc_attr_groups[] = {
	&mmc_std_attr_group,
	NULL,
};

static struct device_type mmc_type = {
	.groups = mmc_attr_groups,
};

/*
 * Handle the detection and initialisation of a card.
 *
 * In the case of a resume, "oldcard" will contain the card
 * we're trying to reinitialise.
 */
static int mmc_init_card(struct mmc_host *host, u32 ocr,
	struct mmc_card *oldcard)
{
	struct mmc_card *card;
	int err;
	u32 cid[4];
	unsigned int max_dtr;

	BUG_ON(!host);
	WARN_ON(!host->claimed);

	/*
	 * 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_go_idle(host);

	/* The extra bit indicates that we support high capacity */
	err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
	if (err)
		goto err;

	/*
	 * For SPI, enable CRC as appropriate.
	 */
	if (mmc_host_is_spi(host)) {
		err = mmc_spi_set_crc(host, use_spi_crc);
		if (err)
			goto err;
	}

	/*
	 * Fetch CID from card.
	 */
	if (mmc_host_is_spi(host))
		err = mmc_send_cid(host, cid);
	else
		err = mmc_all_send_cid(host, cid);
	if (err)
		goto err;

	if (oldcard) {
		if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
			err = -ENOENT;
			goto err;
		}

		card = oldcard;
	} else {
		/*
		 * Allocate card structure.
		 */
		card = mmc_alloc_card(host, &mmc_type);
		if (IS_ERR(card)) {
			err = PTR_ERR(card);
			goto err;
		}

		card->type = MMC_TYPE_MMC;
		card->rca = 1;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}

	/*
	 * For native busses:  set card RCA and quit open drain mode.
	 */
	if (!mmc_host_is_spi(host)) {
		err = mmc_set_relative_addr(card);
		if (err)
			goto free_card;

		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	}

	if (!oldcard) {
		/*
		 * Fetch CSD from card.
		 */
		err = mmc_send_csd(card, card->raw_csd);
		if (err)
			goto free_card;

		err = mmc_decode_csd(card);
		if (err)
			goto free_card;
		err = mmc_decode_cid(card);
		if (err)
			goto free_card;
	}

	/*
	 * Select card, as all following commands rely on that.
	 */
	if (!mmc_host_is_spi(host)) {
		err = mmc_select_card(card);
		if (err)
			goto free_card;
	}

	if (!oldcard) {
		/*
		 * Fetch and process extended CSD.
		 */
		err = mmc_read_ext_csd(card);
		if (err)
			goto free_card;
	}

	/*
	 * Activate high speed (if supported)
	 */
	if ((card->ext_csd.hs_max_dtr != 0) &&
		(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
			EXT_CSD_HS_TIMING, 1);
		if (err && err != -EBADMSG)
			goto free_card;

		if (err) {
			printk(KERN_WARNING "%s: switch to highspeed failed\n",
			       mmc_hostname(card->host));
			err = 0;
		} else {
			mmc_card_set_highspeed(card);
			mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
		}
	}

	/*
	 * Compute bus speed.
	 */
	max_dtr = (unsigned int)-1;

	if (mmc_card_highspeed(card)) {
		if (max_dtr > card->ext_csd.hs_max_dtr)
			max_dtr = card->ext_csd.hs_max_dtr;
	} else if (max_dtr > card->csd.max_dtr) {
		max_dtr = card->csd.max_dtr;
	}

	mmc_set_clock(host, max_dtr);

	/*
	 * Activate wide bus (if supported).
	 */
	if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
	    (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
		unsigned ext_csd_bit, bus_width;

		if (host->caps & MMC_CAP_8_BIT_DATA) {
			ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
			bus_width = MMC_BUS_WIDTH_8;
		} else {
			ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
			bus_width = MMC_BUS_WIDTH_4;
		}

		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
				 EXT_CSD_BUS_WIDTH, ext_csd_bit);

		if (err && err != -EBADMSG)
			goto free_card;

		if (err) {
			printk(KERN_WARNING "%s: switch to bus width %d "
			       "failed\n", mmc_hostname(card->host),
			       1 << bus_width);
			err = 0;
		} else {
			mmc_set_bus_width(card->host, bus_width);
		}
	}

	if (!oldcard)
		host->card = card;

	return 0;

free_card:
	if (!oldcard)
		mmc_remove_card(card);
err:

	return err;
}

/*
 * Host is being removed. Free up the current card.
 */
static void mmc_remove(struct mmc_host *host)
{
	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_remove_card(host->card);
	host->card = NULL;
}

/*
 * Card detection callback from host.
 */
static void mmc_detect(struct mmc_host *host)
{
	int err;

	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);

	/*
	 * Just check if our card has been removed.
	 */
	err = mmc_send_status(host->card, NULL);

	mmc_release_host(host);

	if (err) {
		mmc_remove(host);

		mmc_claim_host(host);
		mmc_detach_bus(host);
		mmc_release_host(host);
	}
}

/*
 * Suspend callback from host.
 */
static int mmc_suspend(struct mmc_host *host)
{
	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);
	if (!mmc_host_is_spi(host))
		mmc_deselect_cards(host);
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_release_host(host);

	return 0;
}

/*
 * Resume callback from host.
 *
 * This function tries to determine if the same card is still present
 * and, if so, restore all state to it.
 */
static int mmc_resume(struct mmc_host *host)
{
	int err;

	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);
	err = mmc_init_card(host, host->ocr, host->card);
	mmc_release_host(host);

	return err;
}

static void mmc_power_restore(struct mmc_host *host)
{
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_claim_host(host);
	mmc_init_card(host, host->ocr, host->card);
	mmc_release_host(host);
}

static int mmc_sleep(struct mmc_host *host)
{
	struct mmc_card *card = host->card;
	int err = -ENOSYS;

	if (card && card->ext_csd.rev >= 3) {
		err = mmc_card_sleepawake(host, 1);
		if (err < 0)
			pr_debug("%s: Error %d while putting card into sleep",
				 mmc_hostname(host), err);
	}

	return err;
}

static int mmc_awake(struct mmc_host *host)
{
	struct mmc_card *card = host->card;
	int err = -ENOSYS;

	if (card && card->ext_csd.rev >= 3) {
		err = mmc_card_sleepawake(host, 0);
		if (err < 0)
			pr_debug("%s: Error %d while awaking sleeping card",
				 mmc_hostname(host), err);
	}

	return err;
}

static const struct mmc_bus_ops mmc_ops = {
	.awake = mmc_awake,
	.sleep = mmc_sleep,
	.remove = mmc_remove,
	.detect = mmc_detect,
	.suspend = NULL,
	.resume = NULL,
	.power_restore = mmc_power_restore,
};

static const struct mmc_bus_ops mmc_ops_unsafe = {
	.awake = mmc_awake,
	.sleep = mmc_sleep,
	.remove = mmc_remove,
	.detect = mmc_detect,
	.suspend = mmc_suspend,
	.resume = mmc_resume,
	.power_restore = mmc_power_restore,
};

static void mmc_attach_bus_ops(struct mmc_host *host)
{
	const struct mmc_bus_ops *bus_ops;

	if (host->caps & MMC_CAP_NONREMOVABLE || !mmc_assume_removable)
		bus_ops = &mmc_ops_unsafe;
	else
		bus_ops = &mmc_ops;
	mmc_attach_bus(host, bus_ops);
}

/*
 * Starting point for MMC card init.
 */
int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
{
	int err;

	BUG_ON(!host);
	WARN_ON(!host->claimed);

	mmc_attach_bus_ops(host);

	/*
	 * We need to get OCR a different way for SPI.
	 */
	if (mmc_host_is_spi(host)) {
		err = mmc_spi_read_ocr(host, 1, &ocr);
		if (err)
			goto err;
	}

	/*
	 * Sanity check the voltages that the card claims to
	 * support.
	 */
	if (ocr & 0x7F) {
		printk(KERN_WARNING "%s: card claims to support voltages "
		       "below the defined range. These will be ignored.\n",
		       mmc_hostname(host));
		ocr &= ~0x7F;
	}

	host->ocr = mmc_select_voltage(host, ocr);

	/*
	 * Can we support the voltage of the card?
	 */
	if (!host->ocr) {
		err = -EINVAL;
		goto err;
	}

	/*
	 * Detect and init the card.
	 */
	err = mmc_init_card(host, host->ocr, NULL);
	if (err)
		goto err;

	mmc_release_host(host);

	err = mmc_add_card(host->card);
	if (err)
		goto remove_card;

	return 0;

remove_card:
	mmc_remove_card(host->card);
	host->card = NULL;
	mmc_claim_host(host);
err:
	mmc_detach_bus(host);
	mmc_release_host(host);

	printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
		mmc_hostname(host), err);

	return err;
}
Commit	Line	Data
7ea239d9	1	/*
70f10482	2	* linux/drivers/mmc/core/mmc.c
7ea239d9 PO	3	*
	4	* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
	5	* Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
	6	* MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/err.h>
5a0e3ad6	14	#include <linux/slab.h>
7ea239d9 PO	15
	16	#include <linux/mmc/host.h>
	17	#include <linux/mmc/card.h>
	18	#include <linux/mmc/mmc.h>
	19
	20	#include "core.h"
4101c16a	21	#include "bus.h"
7ea239d9 PO	22	#include "mmc_ops.h"
	23
	24	static const unsigned int tran_exp[] = {
	25	10000, 100000, 1000000, 10000000,
	26	0, 0, 0, 0
	27	};
	28
	29	static const unsigned char tran_mant[] = {
	30	0, 10, 12, 13, 15, 20, 25, 30,
	31	35, 40, 45, 50, 55, 60, 70, 80,
	32	};
	33
	34	static const unsigned int tacc_exp[] = {
	35	1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
	36	};
	37
	38	static const unsigned int tacc_mant[] = {
	39	0, 10, 12, 13, 15, 20, 25, 30,
	40	35, 40, 45, 50, 55, 60, 70, 80,
	41	};
	42
	43	#define UNSTUFF_BITS(resp,start,size) \
	44	({ \
	45	const int __size = size; \
	46	const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
	47	const int __off = 3 - ((start) / 32); \
	48	const int __shft = (start) & 31; \
	49	u32 __res; \
	50	\
	51	__res = resp[__off] >> __shft; \
	52	if (__size + __shft > 32) \
	53	__res \|= resp[__off-1] << ((32 - __shft) % 32); \
	54	__res & __mask; \
	55	})
	56
	57	/*
	58	* Given the decoded CSD structure, decode the raw CID to our CID structure.
	59	*/
bd766312	60	static int mmc_decode_cid(struct mmc_card *card)
7ea239d9 PO	61	{
	62	u32 *resp = card->raw_cid;
	63
	64	/*
	65	* The selection of the format here is based upon published
	66	* specs from sandisk and from what people have reported.
	67	*/
	68	switch (card->csd.mmca_vsn) {
	69	case 0: /* MMC v1.0 - v1.2 */
	70	case 1: /* MMC v1.4 */
	71	card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
	72	card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
	73	card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
	74	card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
	75	card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
	76	card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
	77	card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
	78	card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
	79	card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
	80	card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
	81	card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
	82	card->cid.month = UNSTUFF_BITS(resp, 12, 4);
	83	card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
	84	break;
	85
	86	case 2: /* MMC v2.0 - v2.2 */
	87	case 3: /* MMC v3.1 - v3.3 */
	88	case 4: /* MMC v4 */
	89	card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
	90	card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
	91	card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
	92	card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
	93	card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
	94	card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
	95	card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
	96	card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
	97	card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
	98	card->cid.month = UNSTUFF_BITS(resp, 12, 4);
	99	card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
	100	break;
	101
	102	default:
facba917	103	printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
7ea239d9	104	mmc_hostname(card->host), card->csd.mmca_vsn);
bd766312	105	return -EINVAL;
7ea239d9	106	}
bd766312 PO	107
bd766312 PO	108	return 0;
7ea239d9 PO	109	}
	110
	111	/*
	112	* Given a 128-bit response, decode to our card CSD structure.
	113	*/
bd766312	114	static int mmc_decode_csd(struct mmc_card *card)
7ea239d9 PO	115	{
	116	struct mmc_csd *csd = &card->csd;
	117	unsigned int e, m, csd_struct;
	118	u32 *resp = card->raw_csd;
	119
	120	/*
	121	* We only understand CSD structure v1.1 and v1.2.
	122	* v1.2 has extra information in bits 15, 11 and 10.
	123	*/
	124	csd_struct = UNSTUFF_BITS(resp, 126, 2);
	125	if (csd_struct != 1 && csd_struct != 2) {
facba917	126	printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
7ea239d9	127	mmc_hostname(card->host), csd_struct);
bd766312	128	return -EINVAL;
7ea239d9 PO	129	}
	130
	131	csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
	132	m = UNSTUFF_BITS(resp, 115, 4);
	133	e = UNSTUFF_BITS(resp, 112, 3);
	134	csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
	135	csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
	136
	137	m = UNSTUFF_BITS(resp, 99, 4);
	138	e = UNSTUFF_BITS(resp, 96, 3);
	139	csd->max_dtr = tran_exp[e] * tran_mant[m];
	140	csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
	141
	142	e = UNSTUFF_BITS(resp, 47, 3);
	143	m = UNSTUFF_BITS(resp, 62, 12);
	144	csd->capacity = (1 + m) << (e + 2);
	145
	146	csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
	147	csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
	148	csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
	149	csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
	150	csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
	151	csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
	152	csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
bd766312 PO	153
bd766312 PO	154	return 0;
7ea239d9 PO	155	}
	156
	157	/*
89a73cf5	158	* Read and decode extended CSD.
7ea239d9	159	*/
89a73cf5	160	static int mmc_read_ext_csd(struct mmc_card *card)
7ea239d9 PO	161	{
	162	int err;
	163	u8 *ext_csd;
	164
	165	BUG_ON(!card);
	166
7ea239d9	167	if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
17b0429d	168	return 0;
7ea239d9 PO	169
	170	/*
	171	* As the ext_csd is so large and mostly unused, we don't store the
	172	* raw block in mmc_card.
	173	*/
	174	ext_csd = kmalloc(512, GFP_KERNEL);
	175	if (!ext_csd) {
	176	printk(KERN_ERR "%s: could not allocate a buffer to "
adf66a0d	177	"receive the ext_csd.\n", mmc_hostname(card->host));
17b0429d	178	return -ENOMEM;
7ea239d9 PO	179	}
	180
	181	err = mmc_send_ext_csd(card, ext_csd);
17b0429d	182	if (err) {
d08ebedd WM	183	/* If the host or the card can't do the switch,
	184	* fail more gracefully. */
	185	if ((err != -EINVAL)
	186	&& (err != -ENOSYS)
	187	&& (err != -EFAULT))
adf66a0d PO	188	goto out;
adf66a0d PO	189
7ea239d9 PO	190	/*
	191	* High capacity cards should have this "magic" size
	192	* stored in their CSD.
	193	*/
	194	if (card->csd.capacity == (4096 * 512)) {
	195	printk(KERN_ERR "%s: unable to read EXT_CSD "
	196	"on a possible high capacity card. "
	197	"Card will be ignored.\n",
	198	mmc_hostname(card->host));
	199	} else {
	200	printk(KERN_WARNING "%s: unable to read "
	201	"EXT_CSD, performance might "
	202	"suffer.\n",
	203	mmc_hostname(card->host));
17b0429d	204	err = 0;
7ea239d9	205	}
adf66a0d	206
7ea239d9 PO	207	goto out;
	208	}
	209
b1ebe384	210	card->ext_csd.rev = ext_csd[EXT_CSD_REV];
11723ab1	211	if (card->ext_csd.rev > 5) {
8fdd8521 PO	212	printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
8fdd8521 PO	213	"version %d\n", mmc_hostname(card->host),
b1ebe384	214	card->ext_csd.rev);
00cedfa6 FM	215	err = -EINVAL;
00cedfa6 FM	216	goto out;
d7604d76 PO	217	}
d7604d76 PO	218
b1ebe384	219	if (card->ext_csd.rev >= 2) {
d7604d76 PO	220	card->ext_csd.sectors =
	221	ext_csd[EXT_CSD_SEC_CNT + 0] << 0 \|
	222	ext_csd[EXT_CSD_SEC_CNT + 1] << 8 \|
	223	ext_csd[EXT_CSD_SEC_CNT + 2] << 16 \|
	224	ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
	225	if (card->ext_csd.sectors)
	226	mmc_card_set_blockaddr(card);
	227	}
7ea239d9	228
7198f3c9	229	switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
7ea239d9 PO	230	case EXT_CSD_CARD_TYPE_52 \| EXT_CSD_CARD_TYPE_26:
	231	card->ext_csd.hs_max_dtr = 52000000;
	232	break;
	233	case EXT_CSD_CARD_TYPE_26:
	234	card->ext_csd.hs_max_dtr = 26000000;
	235	break;
	236	default:
	237	/* MMC v4 spec says this cannot happen */
	238	printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
	239	"support any high-speed modes.\n",
	240	mmc_hostname(card->host));
7ea239d9 PO	241	}
7ea239d9 PO	242
b1ebe384 JL	243	if (card->ext_csd.rev >= 3) {
	244	u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
	245
	246	/* Sleep / awake timeout in 100ns units */
	247	if (sa_shift > 0 && sa_shift <= 0x17)
	248	card->ext_csd.sa_timeout =
	249	1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
	250	}
	251
7ea239d9 PO	252	out:
	253	kfree(ext_csd);
	254
	255	return err;
	256	}
	257
51ec92e2 PO	258	MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	259	card->raw_cid[2], card->raw_cid[3]);
	260	MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	261	card->raw_csd[2], card->raw_csd[3]);
	262	MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
	263	MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
	264	MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
	265	MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
	266	MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
	267	MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
	268	MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
	269
	270	static struct attribute *mmc_std_attrs[] = {
	271	&dev_attr_cid.attr,
	272	&dev_attr_csd.attr,
	273	&dev_attr_date.attr,
	274	&dev_attr_fwrev.attr,
	275	&dev_attr_hwrev.attr,
	276	&dev_attr_manfid.attr,
	277	&dev_attr_name.attr,
	278	&dev_attr_oemid.attr,
	279	&dev_attr_serial.attr,
	280	NULL,
	281	};
	282
	283	static struct attribute_group mmc_std_attr_group = {
	284	.attrs = mmc_std_attrs,
	285	};
	286
a4dbd674	287	static const struct attribute_group *mmc_attr_groups[] = {
51ec92e2 PO	288	&mmc_std_attr_group,
	289	NULL,
	290	};
	291
	292	static struct device_type mmc_type = {
	293	.groups = mmc_attr_groups,
	294	};
	295
7ea239d9	296	/*
6abaa0c9 PO	297	* Handle the detection and initialisation of a card.
6abaa0c9 PO	298	*
8769392b	299	* In the case of a resume, "oldcard" will contain the card
6abaa0c9	300	* we're trying to reinitialise.
7ea239d9	301	*/
8c75deae	302	static int mmc_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9	303	struct mmc_card *oldcard)
7ea239d9 PO	304	{
	305	struct mmc_card *card;
	306	int err;
	307	u32 cid[4];
	308	unsigned int max_dtr;
	309
	310	BUG_ON(!host);
d84075c8	311	WARN_ON(!host->claimed);
7ea239d9	312
7ea239d9 PO	313	/*
	314	* Since we're changing the OCR value, we seem to
	315	* need to tell some cards to go back to the idle
	316	* state. We wait 1ms to give cards time to
	317	* respond.
	318	*/
	319	mmc_go_idle(host);
	320
	321	/* The extra bit indicates that we support high capacity */
6abaa0c9	322	err = mmc_send_op_cond(host, ocr \| (1 << 30), NULL);
17b0429d	323	if (err)
6abaa0c9	324	goto err;
7ea239d9	325
af517150 DB	326	/*
	327	* For SPI, enable CRC as appropriate.
	328	*/
	329	if (mmc_host_is_spi(host)) {
	330	err = mmc_spi_set_crc(host, use_spi_crc);
	331	if (err)
	332	goto err;
	333	}
	334
7ea239d9 PO	335	/*
	336	* Fetch CID from card.
	337	*/
af517150 DB	338	if (mmc_host_is_spi(host))
	339	err = mmc_send_cid(host, cid);
	340	else
	341	err = mmc_all_send_cid(host, cid);
17b0429d	342	if (err)
7ea239d9 PO	343	goto err;
7ea239d9 PO	344
6abaa0c9	345	if (oldcard) {
adf66a0d PO	346	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
adf66a0d PO	347	err = -ENOENT;
6abaa0c9	348	goto err;
adf66a0d	349	}
6abaa0c9 PO	350
	351	card = oldcard;
	352	} else {
	353	/*
	354	* Allocate card structure.
	355	*/
51ec92e2	356	card = mmc_alloc_card(host, &mmc_type);
adf66a0d PO	357	if (IS_ERR(card)) {
adf66a0d PO	358	err = PTR_ERR(card);
6abaa0c9	359	goto err;
adf66a0d	360	}
7ea239d9	361
6abaa0c9 PO	362	card->type = MMC_TYPE_MMC;
	363	card->rca = 1;
	364	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	365	}
7ea239d9 PO	366
7ea239d9 PO	367	/*
af517150	368	* For native busses: set card RCA and quit open drain mode.
7ea239d9	369	*/
af517150 DB	370	if (!mmc_host_is_spi(host)) {
	371	err = mmc_set_relative_addr(card);
	372	if (err)
	373	goto free_card;
7ea239d9	374
af517150 DB	375	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
af517150 DB	376	}
7ea239d9	377
6abaa0c9 PO	378	if (!oldcard) {
	379	/*
	380	* Fetch CSD from card.
	381	*/
	382	err = mmc_send_csd(card, card->raw_csd);
17b0429d	383	if (err)
6abaa0c9	384	goto free_card;
7ea239d9	385
bd766312	386	err = mmc_decode_csd(card);
adf66a0d	387	if (err)
bd766312 PO	388	goto free_card;
bd766312 PO	389	err = mmc_decode_cid(card);
adf66a0d	390	if (err)
bd766312	391	goto free_card;
6abaa0c9	392	}
7ea239d9 PO	393
7ea239d9 PO	394	/*
89a73cf5	395	* Select card, as all following commands rely on that.
7ea239d9	396	*/
af517150 DB	397	if (!mmc_host_is_spi(host)) {
	398	err = mmc_select_card(card);
	399	if (err)
	400	goto free_card;
	401	}
7ea239d9	402
6abaa0c9 PO	403	if (!oldcard) {
6abaa0c9 PO	404	/*
af517150	405	* Fetch and process extended CSD.
6abaa0c9 PO	406	*/
6abaa0c9 PO	407	err = mmc_read_ext_csd(card);
17b0429d	408	if (err)
6abaa0c9 PO	409	goto free_card;
6abaa0c9 PO	410	}
7ea239d9	411
89a73cf5 PO	412	/*
	413	* Activate high speed (if supported)
	414	*/
	415	if ((card->ext_csd.hs_max_dtr != 0) &&
	416	(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
	417	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	418	EXT_CSD_HS_TIMING, 1);
ef0b27d4	419	if (err && err != -EBADMSG)
89a73cf5 PO	420	goto free_card;
89a73cf5 PO	421
ef0b27d4 AH	422	if (err) {
	423	printk(KERN_WARNING "%s: switch to highspeed failed\n",
	424	mmc_hostname(card->host));
	425	err = 0;
	426	} else {
	427	mmc_card_set_highspeed(card);
	428	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
	429	}
89a73cf5 PO	430	}
89a73cf5 PO	431
7ea239d9 PO	432	/*
	433	* Compute bus speed.
	434	*/
	435	max_dtr = (unsigned int)-1;
	436
	437	if (mmc_card_highspeed(card)) {
	438	if (max_dtr > card->ext_csd.hs_max_dtr)
	439	max_dtr = card->ext_csd.hs_max_dtr;
	440	} else if (max_dtr > card->csd.max_dtr) {
	441	max_dtr = card->csd.max_dtr;
	442	}
	443
	444	mmc_set_clock(host, max_dtr);
	445
89a73cf5 PO	446	/*
	447	* Activate wide bus (if supported).
	448	*/
	449	if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
b30f8af3 JL	450	(host->caps & (MMC_CAP_4_BIT_DATA \| MMC_CAP_8_BIT_DATA))) {
	451	unsigned ext_csd_bit, bus_width;
	452
	453	if (host->caps & MMC_CAP_8_BIT_DATA) {
	454	ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
	455	bus_width = MMC_BUS_WIDTH_8;
	456	} else {
	457	ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
	458	bus_width = MMC_BUS_WIDTH_4;
	459	}
	460
89a73cf5	461	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
b30f8af3 JL	462	EXT_CSD_BUS_WIDTH, ext_csd_bit);
b30f8af3 JL	463
ef0b27d4	464	if (err && err != -EBADMSG)
89a73cf5 PO	465	goto free_card;
89a73cf5 PO	466
ef0b27d4 AH	467	if (err) {
	468	printk(KERN_WARNING "%s: switch to bus width %d "
	469	"failed\n", mmc_hostname(card->host),
	470	1 << bus_width);
	471	err = 0;
	472	} else {
	473	mmc_set_bus_width(card->host, bus_width);
	474	}
89a73cf5 PO	475	}
89a73cf5 PO	476
6abaa0c9 PO	477	if (!oldcard)
	478	host->card = card;
	479
17b0429d	480	return 0;
6abaa0c9 PO	481
	482	free_card:
	483	if (!oldcard)
	484	mmc_remove_card(card);
	485	err:
	486
adf66a0d	487	return err;
6abaa0c9 PO	488	}
	489
	490	/*
	491	* Host is being removed. Free up the current card.
	492	*/
	493	static void mmc_remove(struct mmc_host *host)
	494	{
	495	BUG_ON(!host);
	496	BUG_ON(!host->card);
	497
	498	mmc_remove_card(host->card);
	499	host->card = NULL;
	500	}
	501
	502	/*
	503	* Card detection callback from host.
	504	*/
	505	static void mmc_detect(struct mmc_host *host)
	506	{
	507	int err;
	508
	509	BUG_ON(!host);
	510	BUG_ON(!host->card);
	511
	512	mmc_claim_host(host);
	513
	514	/*
	515	* Just check if our card has been removed.
	516	*/
	517	err = mmc_send_status(host->card, NULL);
	518
	519	mmc_release_host(host);
	520
17b0429d	521	if (err) {
4101c16a	522	mmc_remove(host);
6abaa0c9 PO	523
	524	mmc_claim_host(host);
	525	mmc_detach_bus(host);
	526	mmc_release_host(host);
	527	}
	528	}
	529
6abaa0c9 PO	530	/*
	531	* Suspend callback from host.
	532	*/
95cdfb72	533	static int mmc_suspend(struct mmc_host *host)
6abaa0c9 PO	534	{
	535	BUG_ON(!host);
	536	BUG_ON(!host->card);
7ea239d9	537
6abaa0c9	538	mmc_claim_host(host);
af517150 DB	539	if (!mmc_host_is_spi(host))
af517150 DB	540	mmc_deselect_cards(host);
6abaa0c9	541	host->card->state &= ~MMC_STATE_HIGHSPEED;
7ea239d9	542	mmc_release_host(host);
95cdfb72 NP	543
95cdfb72 NP	544	return 0;
6abaa0c9	545	}
7ea239d9	546
6abaa0c9 PO	547	/*
	548	* Resume callback from host.
	549	*
	550	* This function tries to determine if the same card is still present
	551	* and, if so, restore all state to it.
	552	*/
95cdfb72	553	static int mmc_resume(struct mmc_host *host)
6abaa0c9 PO	554	{
	555	int err;
	556
	557	BUG_ON(!host);
	558	BUG_ON(!host->card);
	559
	560	mmc_claim_host(host);
8c75deae	561	err = mmc_init_card(host, host->ocr, host->card);
2986d0bf PO	562	mmc_release_host(host);
2986d0bf PO	563
95cdfb72	564	return err;
6abaa0c9 PO	565	}
6abaa0c9 PO	566
eae1aeee AH	567	static void mmc_power_restore(struct mmc_host *host)
	568	{
	569	host->card->state &= ~MMC_STATE_HIGHSPEED;
	570	mmc_claim_host(host);
	571	mmc_init_card(host, host->ocr, host->card);
	572	mmc_release_host(host);
	573	}
	574
b1ebe384 JL	575	static int mmc_sleep(struct mmc_host *host)
	576	{
	577	struct mmc_card *card = host->card;
	578	int err = -ENOSYS;
	579
	580	if (card && card->ext_csd.rev >= 3) {
	581	err = mmc_card_sleepawake(host, 1);
	582	if (err < 0)
	583	pr_debug("%s: Error %d while putting card into sleep",
	584	mmc_hostname(host), err);
	585	}
	586
	587	return err;
	588	}
	589
	590	static int mmc_awake(struct mmc_host *host)
	591	{
	592	struct mmc_card *card = host->card;
	593	int err = -ENOSYS;
	594
	595	if (card && card->ext_csd.rev >= 3) {
	596	err = mmc_card_sleepawake(host, 0);
	597	if (err < 0)
	598	pr_debug("%s: Error %d while awaking sleeping card",
	599	mmc_hostname(host), err);
	600	}
	601
	602	return err;
	603	}
	604
6abaa0c9	605	static const struct mmc_bus_ops mmc_ops = {
b1ebe384 JL	606	.awake = mmc_awake,
b1ebe384 JL	607	.sleep = mmc_sleep,
9feae246 AH	608	.remove = mmc_remove,
	609	.detect = mmc_detect,
	610	.suspend = NULL,
	611	.resume = NULL,
eae1aeee	612	.power_restore = mmc_power_restore,
9feae246 AH	613	};
	614
	615	static const struct mmc_bus_ops mmc_ops_unsafe = {
b1ebe384 JL	616	.awake = mmc_awake,
b1ebe384 JL	617	.sleep = mmc_sleep,
6abaa0c9 PO	618	.remove = mmc_remove,
	619	.detect = mmc_detect,
	620	.suspend = mmc_suspend,
	621	.resume = mmc_resume,
eae1aeee	622	.power_restore = mmc_power_restore,
6abaa0c9 PO	623	};
6abaa0c9 PO	624
9feae246 AH	625	static void mmc_attach_bus_ops(struct mmc_host *host)
	626	{
	627	const struct mmc_bus_ops *bus_ops;
	628
bd68e083	629	if (host->caps & MMC_CAP_NONREMOVABLE \|\| !mmc_assume_removable)
9feae246 AH	630	bus_ops = &mmc_ops_unsafe;
	631	else
	632	bus_ops = &mmc_ops;
	633	mmc_attach_bus(host, bus_ops);
	634	}
	635
6abaa0c9 PO	636	/*
	637	* Starting point for MMC card init.
	638	*/
	639	int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
	640	{
	641	int err;
	642
	643	BUG_ON(!host);
d84075c8	644	WARN_ON(!host->claimed);
6abaa0c9	645
9feae246	646	mmc_attach_bus_ops(host);
6abaa0c9	647
af517150 DB	648	/*
	649	* We need to get OCR a different way for SPI.
	650	*/
	651	if (mmc_host_is_spi(host)) {
	652	err = mmc_spi_read_ocr(host, 1, &ocr);
	653	if (err)
	654	goto err;
	655	}
	656
6abaa0c9 PO	657	/*
	658	* Sanity check the voltages that the card claims to
	659	* support.
	660	*/
	661	if (ocr & 0x7F) {
	662	printk(KERN_WARNING "%s: card claims to support voltages "
	663	"below the defined range. These will be ignored.\n",
	664	mmc_hostname(host));
	665	ocr &= ~0x7F;
	666	}
	667
	668	host->ocr = mmc_select_voltage(host, ocr);
	669
	670	/*
	671	* Can we support the voltage of the card?
	672	*/
109b5bed PO	673	if (!host->ocr) {
109b5bed PO	674	err = -EINVAL;
6abaa0c9	675	goto err;
109b5bed	676	}
6abaa0c9 PO	677
	678	/*
	679	* Detect and init the card.
	680	*/
8c75deae	681	err = mmc_init_card(host, host->ocr, NULL);
17b0429d	682	if (err)
6abaa0c9 PO	683	goto err;
	684
	685	mmc_release_host(host);
	686
4101c16a	687	err = mmc_add_card(host->card);
7ea239d9	688	if (err)
2986d0bf	689	goto remove_card;
7ea239d9 PO	690
	691	return 0;
	692
2986d0bf	693	remove_card:
6abaa0c9	694	mmc_remove_card(host->card);
7ea239d9	695	host->card = NULL;
2986d0bf	696	mmc_claim_host(host);
7ea239d9 PO	697	err:
	698	mmc_detach_bus(host);
	699	mmc_release_host(host);
	700
109b5bed PO	701	printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
	702	mmc_hostname(host), err);
	703
adf66a0d	704	return err;
7ea239d9	705	}