[mirror_ubuntu-artful-kernel.git] / drivers / mmc / core / mmc.c

/*
 *  linux/drivers/mmc/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 "sysfs.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("%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("%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);

	err = MMC_ERR_FAILED;

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

	/*
	 * 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. mmc v4 cards will be "
			"treated as v3.\n", mmc_hostname(card->host));
		return MMC_ERR_FAILED;
	}

	err = mmc_send_ext_csd(card, ext_csd);
	if (err != MMC_ERR_NONE) {
		/*
		 * 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 = MMC_ERR_NONE;
		}
		goto out;
	}

	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;
}

/*
 * 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_sd_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);
	BUG_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 != MMC_ERR_NONE)
		goto err;

	/*
	 * Fetch CID from card.
	 */
	err = mmc_all_send_cid(host, cid);
	if (err != MMC_ERR_NONE)
		goto err;

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

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

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

	/*
	 * Set card RCA.
	 */
	err = mmc_set_relative_addr(card);
	if (err != MMC_ERR_NONE)
		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 != MMC_ERR_NONE)
			goto free_card;

		err = mmc_decode_csd(card);
		if (err < 0)
			goto free_card;
		err = mmc_decode_cid(card);
		if (err < 0)
			goto free_card;
	}

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

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

		mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	}

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

	return MMC_ERR_NONE;

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

	return MMC_ERR_FAILED;
}

/*
 * 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_ERR_NONE) {
		mmc_remove_card(host->card);
		host->card = NULL;

		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);
	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_sd_init_card(host, host->ocr, host->card);
	if (err != MMC_ERR_NONE) {
		mmc_remove_card(host->card);
		host->card = NULL;

		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);
	BUG_ON(!host->claimed);

	mmc_attach_bus(host, &mmc_ops);

	/*
	 * 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)
		goto err;

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

	mmc_release_host(host);

	err = mmc_register_card(host->card);
	if (err)
		goto reclaim_host;

	return 0;

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

	return 0;
}
Commit	Line	Data
7ea239d9 PO	1	/*
	2	* linux/drivers/mmc/mmc.c
	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"
	20	#include "sysfs.h"
	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:
	102	printk("%s: card has unknown MMCA version %d\n",
	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) {
	125	printk("%s: unrecognised CSD structure version %d\n",
	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;
	163
	164	BUG_ON(!card);
	165
	166	err = MMC_ERR_FAILED;
	167
	168	if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
	169	return MMC_ERR_NONE;
	170
	171	/*
	172	* As the ext_csd is so large and mostly unused, we don't store the
	173	* raw block in mmc_card.
	174	*/
	175	ext_csd = kmalloc(512, GFP_KERNEL);
	176	if (!ext_csd) {
	177	printk(KERN_ERR "%s: could not allocate a buffer to "
	178	"receive the ext_csd. mmc v4 cards will be "
	179	"treated as v3.\n", mmc_hostname(card->host));
	180	return MMC_ERR_FAILED;
	181	}
	182
	183	err = mmc_send_ext_csd(card, ext_csd);
	184	if (err != MMC_ERR_NONE) {
	185	/*
	186	* High capacity cards should have this "magic" size
	187	* stored in their CSD.
	188	*/
	189	if (card->csd.capacity == (4096 * 512)) {
	190	printk(KERN_ERR "%s: unable to read EXT_CSD "
	191	"on a possible high capacity card. "
	192	"Card will be ignored.\n",
	193	mmc_hostname(card->host));
	194	} else {
	195	printk(KERN_WARNING "%s: unable to read "
	196	"EXT_CSD, performance might "
	197	"suffer.\n",
	198	mmc_hostname(card->host));
	199	err = MMC_ERR_NONE;
	200	}
	201	goto out;
	202	}
	203
	204	card->ext_csd.sectors =
	205	ext_csd[EXT_CSD_SEC_CNT + 0] << 0 \|
	206	ext_csd[EXT_CSD_SEC_CNT + 1] << 8 \|
	207	ext_csd[EXT_CSD_SEC_CNT + 2] << 16 \|
	208	ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
	209	if (card->ext_csd.sectors)
	210	mmc_card_set_blockaddr(card);
	211
	212	switch (ext_csd[EXT_CSD_CARD_TYPE]) {
	213	case EXT_CSD_CARD_TYPE_52 \| EXT_CSD_CARD_TYPE_26:
	214	card->ext_csd.hs_max_dtr = 52000000;
	215	break;
	216	case EXT_CSD_CARD_TYPE_26:
	217	card->ext_csd.hs_max_dtr = 26000000;
	218	break;
	219	default:
	220	/* MMC v4 spec says this cannot happen */
	221	printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
	222	"support any high-speed modes.\n",
	223	mmc_hostname(card->host));
224	goto out;
225	}
226
7ea239d9 PO	227	out:
	228	kfree(ext_csd);
	229
	230	return err;
	231	}
	232
	233	/*
6abaa0c9 PO	234	* Handle the detection and initialisation of a card.
	235	*
	236	* In the case of a resume, "curcard" will contain the card
	237	* we're trying to reinitialise.
7ea239d9	238	*/
6abaa0c9 PO	239	static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9 PO	240	struct mmc_card *oldcard)
7ea239d9 PO	241	{
	242	struct mmc_card *card;
	243	int err;
	244	u32 cid[4];
	245	unsigned int max_dtr;
	246
	247	BUG_ON(!host);
	248	BUG_ON(!host->claimed);
	249
7ea239d9 PO	250	/*
	251	* Since we're changing the OCR value, we seem to
	252	* need to tell some cards to go back to the idle
	253	* state. We wait 1ms to give cards time to
	254	* respond.
	255	*/
	256	mmc_go_idle(host);
	257
	258	/* The extra bit indicates that we support high capacity */
6abaa0c9 PO	259	err = mmc_send_op_cond(host, ocr \| (1 << 30), NULL);
	260	if (err != MMC_ERR_NONE)
	261	goto err;
7ea239d9 PO	262
	263	/*
	264	* Fetch CID from card.
	265	*/
	266	err = mmc_all_send_cid(host, cid);
	267	if (err != MMC_ERR_NONE)
	268	goto err;
	269
6abaa0c9 PO	270	if (oldcard) {
	271	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
	272	goto err;
	273
	274	card = oldcard;
	275	} else {
	276	/*
	277	* Allocate card structure.
	278	*/
	279	card = mmc_alloc_card(host);
	280	if (IS_ERR(card))
	281	goto err;
7ea239d9	282
6abaa0c9 PO	283	card->type = MMC_TYPE_MMC;
	284	card->rca = 1;
	285	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	286	}
7ea239d9 PO	287
	288	/*
	289	* Set card RCA.
	290	*/
	291	err = mmc_set_relative_addr(card);
	292	if (err != MMC_ERR_NONE)
	293	goto free_card;
	294
	295	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	296
6abaa0c9 PO	297	if (!oldcard) {
	298	/*
	299	* Fetch CSD from card.
	300	*/
	301	err = mmc_send_csd(card, card->raw_csd);
	302	if (err != MMC_ERR_NONE)
	303	goto free_card;
7ea239d9	304
bd766312 PO	305	err = mmc_decode_csd(card);
	306	if (err < 0)
	307	goto free_card;
	308	err = mmc_decode_cid(card);
	309	if (err < 0)
	310	goto free_card;
6abaa0c9	311	}
7ea239d9 PO	312
7ea239d9 PO	313	/*
89a73cf5	314	* Select card, as all following commands rely on that.
7ea239d9 PO	315	*/
	316	err = mmc_select_card(card);
	317	if (err != MMC_ERR_NONE)
	318	goto free_card;
	319
6abaa0c9 PO	320	if (!oldcard) {
	321	/*
	322	* Fetch and process extened CSD.
	323	*/
	324	err = mmc_read_ext_csd(card);
	325	if (err != MMC_ERR_NONE)
	326	goto free_card;
	327	}
7ea239d9	328
89a73cf5 PO	329	/*
	330	* Activate high speed (if supported)
	331	*/
	332	if ((card->ext_csd.hs_max_dtr != 0) &&
	333	(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
	334	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	335	EXT_CSD_HS_TIMING, 1);
	336	if (err != MMC_ERR_NONE)
	337	goto free_card;
	338
	339	mmc_card_set_highspeed(card);
	340
	341	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
	342	}
	343
7ea239d9 PO	344	/*
	345	* Compute bus speed.
	346	*/
	347	max_dtr = (unsigned int)-1;
	348
	349	if (mmc_card_highspeed(card)) {
	350	if (max_dtr > card->ext_csd.hs_max_dtr)
	351	max_dtr = card->ext_csd.hs_max_dtr;
	352	} else if (max_dtr > card->csd.max_dtr) {
	353	max_dtr = card->csd.max_dtr;
	354	}
	355
	356	mmc_set_clock(host, max_dtr);
	357
89a73cf5 PO	358	/*
	359	* Activate wide bus (if supported).
	360	*/
	361	if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
	362	(host->caps & MMC_CAP_4_BIT_DATA)) {
	363	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	364	EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
	365	if (err != MMC_ERR_NONE)
	366	goto free_card;
	367
	368	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	369	}
	370
6abaa0c9 PO	371	if (!oldcard)
	372	host->card = card;
	373
	374	return MMC_ERR_NONE;
	375
	376	free_card:
	377	if (!oldcard)
	378	mmc_remove_card(card);
	379	err:
	380
	381	return MMC_ERR_FAILED;
	382	}
	383
	384	/*
	385	* Host is being removed. Free up the current card.
	386	*/
	387	static void mmc_remove(struct mmc_host *host)
	388	{
	389	BUG_ON(!host);
	390	BUG_ON(!host->card);
	391
	392	mmc_remove_card(host->card);
	393	host->card = NULL;
	394	}
	395
	396	/*
	397	* Card detection callback from host.
	398	*/
	399	static void mmc_detect(struct mmc_host *host)
	400	{
	401	int err;
	402
	403	BUG_ON(!host);
	404	BUG_ON(!host->card);
	405
	406	mmc_claim_host(host);
	407
	408	/*
	409	* Just check if our card has been removed.
	410	*/
	411	err = mmc_send_status(host->card, NULL);
	412
	413	mmc_release_host(host);
	414
	415	if (err != MMC_ERR_NONE) {
	416	mmc_remove_card(host->card);
	417	host->card = NULL;
	418
	419	mmc_claim_host(host);
	420	mmc_detach_bus(host);
	421	mmc_release_host(host);
	422	}
	423	}
	424
	425	#ifdef CONFIG_MMC_UNSAFE_RESUME
	426
	427	/*
	428	* Suspend callback from host.
	429	*/
	430	static void mmc_suspend(struct mmc_host *host)
	431	{
	432	BUG_ON(!host);
	433	BUG_ON(!host->card);
7ea239d9	434
6abaa0c9 PO	435	mmc_claim_host(host);
	436	mmc_deselect_cards(host);
	437	host->card->state &= ~MMC_STATE_HIGHSPEED;
7ea239d9	438	mmc_release_host(host);
6abaa0c9	439	}
7ea239d9	440
6abaa0c9 PO	441	/*
	442	* Resume callback from host.
	443	*
	444	* This function tries to determine if the same card is still present
	445	* and, if so, restore all state to it.
	446	*/
	447	static void mmc_resume(struct mmc_host *host)
	448	{
	449	int err;
	450
	451	BUG_ON(!host);
	452	BUG_ON(!host->card);
	453
	454	mmc_claim_host(host);
	455
	456	err = mmc_sd_init_card(host, host->ocr, host->card);
	457	if (err != MMC_ERR_NONE) {
	458	mmc_remove_card(host->card);
	459	host->card = NULL;
	460
	461	mmc_detach_bus(host);
	462	}
	463
	464	mmc_release_host(host);
	465	}
	466
	467	#else
	468
	469	#define mmc_suspend NULL
	470	#define mmc_resume NULL
	471
	472	#endif
	473
	474	static const struct mmc_bus_ops mmc_ops = {
	475	.remove = mmc_remove,
	476	.detect = mmc_detect,
	477	.suspend = mmc_suspend,
	478	.resume = mmc_resume,
	479	};
	480
	481	/*
	482	* Starting point for MMC card init.
	483	*/
	484	int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
	485	{
	486	int err;
	487
	488	BUG_ON(!host);
	489	BUG_ON(!host->claimed);
	490
	491	mmc_attach_bus(host, &mmc_ops);
	492
	493	/*
	494	* Sanity check the voltages that the card claims to
	495	* support.
	496	*/
	497	if (ocr & 0x7F) {
	498	printk(KERN_WARNING "%s: card claims to support voltages "
	499	"below the defined range. These will be ignored.\n",
	500	mmc_hostname(host));
	501	ocr &= ~0x7F;
	502	}
	503
	504	host->ocr = mmc_select_voltage(host, ocr);
505
506	/*
507	* Can we support the voltage of the card?
508	*/
509	if (!host->ocr)
510	goto err;
511
512	/*
513	* Detect and init the card.
514	*/
515	err = mmc_sd_init_card(host, host->ocr, NULL);
516	if (err != MMC_ERR_NONE)
517	goto err;
518
519	mmc_release_host(host);
520
521	err = mmc_register_card(host->card);
7ea239d9 PO	522	if (err)
	523	goto reclaim_host;
	524
	525	return 0;
	526
	527	reclaim_host:
	528	mmc_claim_host(host);
6abaa0c9	529	mmc_remove_card(host->card);
7ea239d9 PO	530	host->card = NULL;
	531	err:
	532	mmc_detach_bus(host);
	533	mmc_release_host(host);
	534
	535	return 0;
	536	}
	537