[linux-2.6-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/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;
	unsigned int ext_csd_struct;

	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) {
		/*
		 * We all hosts that cannot perform the command
		 * to fail more gracefully
		 */
		if (err != -EINVAL)
			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;
	}

	ext_csd_struct = ext_csd[EXT_CSD_REV];
	if (ext_csd_struct > 2) {
		printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
			"version %d\n", mmc_hostname(card->host),
			ext_csd_struct);
		err = -EINVAL;
		goto out;
	}

	if (ext_csd_struct >= 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]) {
	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));
		goto out;
	}

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 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, "curcard" 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)
			goto free_card;

		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)) {
		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
			EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
		if (err)
			goto free_card;

		mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	}

	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);
	}
}

#ifdef CONFIG_MMC_UNSAFE_RESUME

/*
 * Suspend callback from host.
 */
static void 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);
}

/*
 * 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 void 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);

	if (err) {
		mmc_remove(host);

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

}

#else

#define mmc_suspend NULL
#define mmc_resume NULL

#endif

static const struct mmc_bus_ops mmc_ops = {
	.remove = mmc_remove,
	.detect = mmc_detect,
	.suspend = mmc_suspend,
	.resume = mmc_resume,
};

/*
 * 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(host, &mmc_ops);

	/*
	 * 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>
	14
	15	#include <linux/mmc/host.h>
	16	#include <linux/mmc/card.h>
	17	#include <linux/mmc/mmc.h>
	18
	19	#include "core.h"
4101c16a	20	#include "bus.h"
7ea239d9 PO	21	#include "mmc_ops.h"
	22
	23	static const unsigned int tran_exp[] = {
	24	10000, 100000, 1000000, 10000000,
	25	0, 0, 0, 0
	26	};
	27
	28	static const unsigned char tran_mant[] = {
	29	0, 10, 12, 13, 15, 20, 25, 30,
	30	35, 40, 45, 50, 55, 60, 70, 80,
	31	};
	32
	33	static const unsigned int tacc_exp[] = {
	34	1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
	35	};
	36
	37	static const unsigned int tacc_mant[] = {
	38	0, 10, 12, 13, 15, 20, 25, 30,
	39	35, 40, 45, 50, 55, 60, 70, 80,
	40	};
	41
	42	#define UNSTUFF_BITS(resp,start,size) \
	43	({ \
	44	const int __size = size; \
	45	const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
	46	const int __off = 3 - ((start) / 32); \
	47	const int __shft = (start) & 31; \
	48	u32 __res; \
	49	\
	50	__res = resp[__off] >> __shft; \
	51	if (__size + __shft > 32) \
	52	__res \|= resp[__off-1] << ((32 - __shft) % 32); \
	53	__res & __mask; \
	54	})
	55
	56	/*
	57	* Given the decoded CSD structure, decode the raw CID to our CID structure.
	58	*/
bd766312	59	static int mmc_decode_cid(struct mmc_card *card)
7ea239d9 PO	60	{
	61	u32 *resp = card->raw_cid;
	62
	63	/*
	64	* The selection of the format here is based upon published
	65	* specs from sandisk and from what people have reported.
	66	*/
	67	switch (card->csd.mmca_vsn) {
	68	case 0: /* MMC v1.0 - v1.2 */
	69	case 1: /* MMC v1.4 */
	70	card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
	71	card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
	72	card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
	73	card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
	74	card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
	75	card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
	76	card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
	77	card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
	78	card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
	79	card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
	80	card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
	81	card->cid.month = UNSTUFF_BITS(resp, 12, 4);
	82	card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
	83	break;
	84
	85	case 2: /* MMC v2.0 - v2.2 */
	86	case 3: /* MMC v3.1 - v3.3 */
	87	case 4: /* MMC v4 */
	88	card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
	89	card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
	90	card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
	91	card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
	92	card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
	93	card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
	94	card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
	95	card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
	96	card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
	97	card->cid.month = UNSTUFF_BITS(resp, 12, 4);
	98	card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
	99	break;
	100
	101	default:
facba917	102	printk(KERN_ERR "%s: card has unknown MMCA version %d\n",
7ea239d9	103	mmc_hostname(card->host), card->csd.mmca_vsn);
bd766312	104	return -EINVAL;
7ea239d9	105	}
bd766312 PO	106
bd766312 PO	107	return 0;
7ea239d9 PO	108	}
	109
	110	/*
	111	* Given a 128-bit response, decode to our card CSD structure.
	112	*/
bd766312	113	static int mmc_decode_csd(struct mmc_card *card)
7ea239d9 PO	114	{
	115	struct mmc_csd *csd = &card->csd;
	116	unsigned int e, m, csd_struct;
	117	u32 *resp = card->raw_csd;
	118
	119	/*
	120	* We only understand CSD structure v1.1 and v1.2.
	121	* v1.2 has extra information in bits 15, 11 and 10.
	122	*/
	123	csd_struct = UNSTUFF_BITS(resp, 126, 2);
	124	if (csd_struct != 1 && csd_struct != 2) {
facba917	125	printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
7ea239d9	126	mmc_hostname(card->host), csd_struct);
bd766312	127	return -EINVAL;
7ea239d9 PO	128	}
	129
	130	csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
	131	m = UNSTUFF_BITS(resp, 115, 4);
	132	e = UNSTUFF_BITS(resp, 112, 3);
	133	csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
	134	csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
	135
	136	m = UNSTUFF_BITS(resp, 99, 4);
	137	e = UNSTUFF_BITS(resp, 96, 3);
	138	csd->max_dtr = tran_exp[e] * tran_mant[m];
	139	csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
	140
	141	e = UNSTUFF_BITS(resp, 47, 3);
	142	m = UNSTUFF_BITS(resp, 62, 12);
	143	csd->capacity = (1 + m) << (e + 2);
	144
	145	csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
	146	csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
	147	csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
	148	csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
	149	csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
	150	csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
	151	csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
bd766312 PO	152
bd766312 PO	153	return 0;
7ea239d9 PO	154	}
	155
	156	/*
89a73cf5	157	* Read and decode extended CSD.
7ea239d9	158	*/
89a73cf5	159	static int mmc_read_ext_csd(struct mmc_card *card)
7ea239d9 PO	160	{
	161	int err;
	162	u8 *ext_csd;
d7604d76	163	unsigned int ext_csd_struct;
7ea239d9 PO	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) {
adf66a0d PO	183	/*
	184	* We all hosts that cannot perform the command
	185	* to fail more gracefully
	186	*/
	187	if (err != -EINVAL)
	188	goto out;
	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
d7604d76 PO	210	ext_csd_struct = ext_csd[EXT_CSD_REV];
d7604d76 PO	211	if (ext_csd_struct > 2) {
8fdd8521 PO	212	printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
	213	"version %d\n", mmc_hostname(card->host),
	214	ext_csd_struct);
00cedfa6 FM	215	err = -EINVAL;
00cedfa6 FM	216	goto out;
d7604d76 PO	217	}
	218
	219	if (ext_csd_struct >= 2) {
	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 PO	228
	229	switch (ext_csd[EXT_CSD_CARD_TYPE]) {
	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));
	241	goto out;
	242	}
	243
7ea239d9 PO	244	out:
	245	kfree(ext_csd);
	246
	247	return err;
	248	}
	249
51ec92e2 PO	250	MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	251	card->raw_cid[2], card->raw_cid[3]);
	252	MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	253	card->raw_csd[2], card->raw_csd[3]);
	254	MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
	255	MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
	256	MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
	257	MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
	258	MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
	259	MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
	260	MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
	261
	262	static struct attribute *mmc_std_attrs[] = {
	263	&dev_attr_cid.attr,
	264	&dev_attr_csd.attr,
	265	&dev_attr_date.attr,
	266	&dev_attr_fwrev.attr,
	267	&dev_attr_hwrev.attr,
	268	&dev_attr_manfid.attr,
	269	&dev_attr_name.attr,
	270	&dev_attr_oemid.attr,
	271	&dev_attr_serial.attr,
	272	NULL,
	273	};
	274
	275	static struct attribute_group mmc_std_attr_group = {
	276	.attrs = mmc_std_attrs,
	277	};
	278
	279	static struct attribute_group *mmc_attr_groups[] = {
	280	&mmc_std_attr_group,
	281	NULL,
	282	};
	283
	284	static struct device_type mmc_type = {
	285	.groups = mmc_attr_groups,
	286	};
	287
7ea239d9	288	/*
6abaa0c9 PO	289	* Handle the detection and initialisation of a card.
	290	*
	291	* In the case of a resume, "curcard" will contain the card
	292	* we're trying to reinitialise.
7ea239d9	293	*/
8c75deae	294	static int mmc_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9	295	struct mmc_card *oldcard)
7ea239d9 PO	296	{
	297	struct mmc_card *card;
	298	int err;
	299	u32 cid[4];
	300	unsigned int max_dtr;
	301
	302	BUG_ON(!host);
d84075c8	303	WARN_ON(!host->claimed);
7ea239d9	304
7ea239d9 PO	305	/*
	306	* Since we're changing the OCR value, we seem to
	307	* need to tell some cards to go back to the idle
	308	* state. We wait 1ms to give cards time to
	309	* respond.
	310	*/
	311	mmc_go_idle(host);
	312
	313	/* The extra bit indicates that we support high capacity */
6abaa0c9	314	err = mmc_send_op_cond(host, ocr \| (1 << 30), NULL);
17b0429d	315	if (err)
6abaa0c9	316	goto err;
7ea239d9	317
af517150 DB	318	/*
	319	* For SPI, enable CRC as appropriate.
	320	*/
	321	if (mmc_host_is_spi(host)) {
	322	err = mmc_spi_set_crc(host, use_spi_crc);
	323	if (err)
	324	goto err;
	325	}
	326
7ea239d9 PO	327	/*
	328	* Fetch CID from card.
	329	*/
af517150 DB	330	if (mmc_host_is_spi(host))
	331	err = mmc_send_cid(host, cid);
	332	else
	333	err = mmc_all_send_cid(host, cid);
17b0429d	334	if (err)
7ea239d9 PO	335	goto err;
7ea239d9 PO	336
6abaa0c9	337	if (oldcard) {
adf66a0d PO	338	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
adf66a0d PO	339	err = -ENOENT;
6abaa0c9	340	goto err;
adf66a0d	341	}
6abaa0c9 PO	342
	343	card = oldcard;
	344	} else {
	345	/*
	346	* Allocate card structure.
	347	*/
51ec92e2	348	card = mmc_alloc_card(host, &mmc_type);
adf66a0d PO	349	if (IS_ERR(card)) {
adf66a0d PO	350	err = PTR_ERR(card);
6abaa0c9	351	goto err;
adf66a0d	352	}
7ea239d9	353
6abaa0c9 PO	354	card->type = MMC_TYPE_MMC;
	355	card->rca = 1;
	356	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	357	}
7ea239d9 PO	358
7ea239d9 PO	359	/*
af517150	360	* For native busses: set card RCA and quit open drain mode.
7ea239d9	361	*/
af517150 DB	362	if (!mmc_host_is_spi(host)) {
	363	err = mmc_set_relative_addr(card);
	364	if (err)
	365	goto free_card;
7ea239d9	366
af517150 DB	367	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
af517150 DB	368	}
7ea239d9	369
6abaa0c9 PO	370	if (!oldcard) {
	371	/*
	372	* Fetch CSD from card.
	373	*/
	374	err = mmc_send_csd(card, card->raw_csd);
17b0429d	375	if (err)
6abaa0c9	376	goto free_card;
7ea239d9	377
bd766312	378	err = mmc_decode_csd(card);
adf66a0d	379	if (err)
bd766312 PO	380	goto free_card;
bd766312 PO	381	err = mmc_decode_cid(card);
adf66a0d	382	if (err)
bd766312	383	goto free_card;
6abaa0c9	384	}
7ea239d9 PO	385
7ea239d9 PO	386	/*
89a73cf5	387	* Select card, as all following commands rely on that.
7ea239d9	388	*/
af517150 DB	389	if (!mmc_host_is_spi(host)) {
	390	err = mmc_select_card(card);
	391	if (err)
	392	goto free_card;
	393	}
7ea239d9	394
6abaa0c9 PO	395	if (!oldcard) {
6abaa0c9 PO	396	/*
af517150	397	* Fetch and process extended CSD.
6abaa0c9 PO	398	*/
6abaa0c9 PO	399	err = mmc_read_ext_csd(card);
17b0429d	400	if (err)
6abaa0c9 PO	401	goto free_card;
6abaa0c9 PO	402	}
7ea239d9	403
89a73cf5 PO	404	/*
	405	* Activate high speed (if supported)
	406	*/
	407	if ((card->ext_csd.hs_max_dtr != 0) &&
	408	(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
	409	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	410	EXT_CSD_HS_TIMING, 1);
17b0429d	411	if (err)
89a73cf5 PO	412	goto free_card;
	413
	414	mmc_card_set_highspeed(card);
	415
	416	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
	417	}
	418
7ea239d9 PO	419	/*
	420	* Compute bus speed.
	421	*/
	422	max_dtr = (unsigned int)-1;
	423
	424	if (mmc_card_highspeed(card)) {
	425	if (max_dtr > card->ext_csd.hs_max_dtr)
	426	max_dtr = card->ext_csd.hs_max_dtr;
	427	} else if (max_dtr > card->csd.max_dtr) {
	428	max_dtr = card->csd.max_dtr;
	429	}
	430
	431	mmc_set_clock(host, max_dtr);
	432
89a73cf5 PO	433	/*
	434	* Activate wide bus (if supported).
	435	*/
	436	if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
	437	(host->caps & MMC_CAP_4_BIT_DATA)) {
	438	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	439	EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
17b0429d	440	if (err)
89a73cf5 PO	441	goto free_card;
	442
	443	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	444	}
	445
6abaa0c9 PO	446	if (!oldcard)
	447	host->card = card;
	448
17b0429d	449	return 0;
6abaa0c9 PO	450
	451	free_card:
	452	if (!oldcard)
	453	mmc_remove_card(card);
	454	err:
	455
adf66a0d	456	return err;
6abaa0c9 PO	457	}
	458
	459	/*
	460	* Host is being removed. Free up the current card.
	461	*/
	462	static void mmc_remove(struct mmc_host *host)
	463	{
	464	BUG_ON(!host);
	465	BUG_ON(!host->card);
	466
	467	mmc_remove_card(host->card);
	468	host->card = NULL;
	469	}
	470
	471	/*
	472	* Card detection callback from host.
	473	*/
	474	static void mmc_detect(struct mmc_host *host)
	475	{
	476	int err;
	477
	478	BUG_ON(!host);
	479	BUG_ON(!host->card);
	480
	481	mmc_claim_host(host);
	482
	483	/*
	484	* Just check if our card has been removed.
	485	*/
	486	err = mmc_send_status(host->card, NULL);
	487
	488	mmc_release_host(host);
	489
17b0429d	490	if (err) {
4101c16a	491	mmc_remove(host);
6abaa0c9 PO	492
	493	mmc_claim_host(host);
	494	mmc_detach_bus(host);
	495	mmc_release_host(host);
	496	}
	497	}
	498
	499	#ifdef CONFIG_MMC_UNSAFE_RESUME
	500
	501	/*
	502	* Suspend callback from host.
	503	*/
	504	static void mmc_suspend(struct mmc_host *host)
	505	{
	506	BUG_ON(!host);
	507	BUG_ON(!host->card);
7ea239d9	508
6abaa0c9	509	mmc_claim_host(host);
af517150 DB	510	if (!mmc_host_is_spi(host))
af517150 DB	511	mmc_deselect_cards(host);
6abaa0c9	512	host->card->state &= ~MMC_STATE_HIGHSPEED;
7ea239d9	513	mmc_release_host(host);
6abaa0c9	514	}
7ea239d9	515
6abaa0c9 PO	516	/*
	517	* Resume callback from host.
	518	*
	519	* This function tries to determine if the same card is still present
	520	* and, if so, restore all state to it.
	521	*/
	522	static void mmc_resume(struct mmc_host *host)
	523	{
	524	int err;
	525
	526	BUG_ON(!host);
	527	BUG_ON(!host->card);
	528
	529	mmc_claim_host(host);
8c75deae	530	err = mmc_init_card(host, host->ocr, host->card);
2986d0bf PO	531	mmc_release_host(host);
2986d0bf PO	532
17b0429d	533	if (err) {
4101c16a	534	mmc_remove(host);
2986d0bf PO	535
2986d0bf PO	536	mmc_claim_host(host);
6abaa0c9	537	mmc_detach_bus(host);
2986d0bf	538	mmc_release_host(host);
6abaa0c9 PO	539	}
6abaa0c9 PO	540
6abaa0c9 PO	541	}
	542
	543	#else
	544
	545	#define mmc_suspend NULL
	546	#define mmc_resume NULL
	547
	548	#endif
	549
	550	static const struct mmc_bus_ops mmc_ops = {
	551	.remove = mmc_remove,
	552	.detect = mmc_detect,
	553	.suspend = mmc_suspend,
	554	.resume = mmc_resume,
	555	};
	556
	557	/*
	558	* Starting point for MMC card init.
	559	*/
	560	int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
	561	{
	562	int err;
	563
	564	BUG_ON(!host);
d84075c8	565	WARN_ON(!host->claimed);
6abaa0c9 PO	566
	567	mmc_attach_bus(host, &mmc_ops);
	568
af517150 DB	569	/*
	570	* We need to get OCR a different way for SPI.
	571	*/
	572	if (mmc_host_is_spi(host)) {
	573	err = mmc_spi_read_ocr(host, 1, &ocr);
	574	if (err)
	575	goto err;
	576	}
	577
6abaa0c9 PO	578	/*
	579	* Sanity check the voltages that the card claims to
	580	* support.
	581	*/
	582	if (ocr & 0x7F) {
	583	printk(KERN_WARNING "%s: card claims to support voltages "
	584	"below the defined range. These will be ignored.\n",
	585	mmc_hostname(host));
	586	ocr &= ~0x7F;
	587	}
	588
	589	host->ocr = mmc_select_voltage(host, ocr);
	590
	591	/*
	592	* Can we support the voltage of the card?
	593	*/
109b5bed PO	594	if (!host->ocr) {
109b5bed PO	595	err = -EINVAL;
6abaa0c9	596	goto err;
109b5bed	597	}
6abaa0c9 PO	598
	599	/*
	600	* Detect and init the card.
	601	*/
8c75deae	602	err = mmc_init_card(host, host->ocr, NULL);
17b0429d	603	if (err)
6abaa0c9 PO	604	goto err;
	605
	606	mmc_release_host(host);
	607
4101c16a	608	err = mmc_add_card(host->card);
7ea239d9	609	if (err)
2986d0bf	610	goto remove_card;
7ea239d9 PO	611
	612	return 0;
	613
2986d0bf	614	remove_card:
6abaa0c9	615	mmc_remove_card(host->card);
7ea239d9	616	host->card = NULL;
2986d0bf	617	mmc_claim_host(host);
7ea239d9 PO	618	err:
	619	mmc_detach_bus(host);
	620	mmc_release_host(host);
	621
109b5bed PO	622	printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
	623	mmc_hostname(host), err);
	624
adf66a0d	625	return err;
7ea239d9 PO	626	}
7ea239d9 PO	627