[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 "sysfs.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("%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_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(host);

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

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

static struct device_attribute mmc_dev_attrs[] = {
	MMC_ATTR_RO(cid),
	MMC_ATTR_RO(csd),
	MMC_ATTR_RO(date),
	MMC_ATTR_RO(fwrev),
	MMC_ATTR_RO(hwrev),
	MMC_ATTR_RO(manfid),
	MMC_ATTR_RO(name),
	MMC_ATTR_RO(oemid),
	MMC_ATTR_RO(serial),
	__ATTR_NULL,
};

/*
 * Adds sysfs entries as relevant.
 */
static int mmc_sysfs_add(struct mmc_host *host, struct mmc_card *card)
{
	int ret;

	ret = mmc_add_attrs(card, mmc_dev_attrs);
	if (ret < 0)
		return ret;

	return 0;
}

/*
 * Removes the sysfs entries added by mmc_sysfs_add().
 */
static void mmc_sysfs_remove(struct mmc_host *host, struct mmc_card *card)
{
	mmc_remove_attrs(card, mmc_dev_attrs);
}

#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_init_card(host, host->ocr, host->card);
	mmc_release_host(host);

	if (err != MMC_ERR_NONE) {
		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,
	.sysfs_add = mmc_sysfs_add,
	.sysfs_remove = mmc_sysfs_remove,
	.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_init_card(host, host->ocr, NULL);
	if (err != MMC_ERR_NONE)
		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);

	return 0;
}
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"
	20	#include "sysfs.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:
	103	printk("%s: card has unknown MMCA version %d\n",
	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) {
	126	printk("%s: unrecognised CSD structure version %d\n",
	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
	167	err = MMC_ERR_FAILED;
	168
	169	if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
	170	return MMC_ERR_NONE;
	171
	172	/*
	173	* As the ext_csd is so large and mostly unused, we don't store the
	174	* raw block in mmc_card.
	175	*/
	176	ext_csd = kmalloc(512, GFP_KERNEL);
	177	if (!ext_csd) {
	178	printk(KERN_ERR "%s: could not allocate a buffer to "
	179	"receive the ext_csd. mmc v4 cards will be "
	180	"treated as v3.\n", mmc_hostname(card->host));
	181	return MMC_ERR_FAILED;
	182	}
	183
	184	err = mmc_send_ext_csd(card, ext_csd);
	185	if (err != MMC_ERR_NONE) {
	186	/*
	187	* High capacity cards should have this "magic" size
	188	* stored in their CSD.
	189	*/
	190	if (card->csd.capacity == (4096 * 512)) {
	191	printk(KERN_ERR "%s: unable to read EXT_CSD "
	192	"on a possible high capacity card. "
	193	"Card will be ignored.\n",
	194	mmc_hostname(card->host));
	195	} else {
	196	printk(KERN_WARNING "%s: unable to read "
	197	"EXT_CSD, performance might "
	198	"suffer.\n",
	199	mmc_hostname(card->host));
	200	err = MMC_ERR_NONE;
	201	}
	202	goto out;
	203	}
	204
	205	card->ext_csd.sectors =
	206	ext_csd[EXT_CSD_SEC_CNT + 0] << 0 \|
	207	ext_csd[EXT_CSD_SEC_CNT + 1] << 8 \|
	208	ext_csd[EXT_CSD_SEC_CNT + 2] << 16 \|
	209	ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
	210	if (card->ext_csd.sectors)
	211	mmc_card_set_blockaddr(card);
	212
	213	switch (ext_csd[EXT_CSD_CARD_TYPE]) {
	214	case EXT_CSD_CARD_TYPE_52 \| EXT_CSD_CARD_TYPE_26:
	215	card->ext_csd.hs_max_dtr = 52000000;
	216	break;
	217	case EXT_CSD_CARD_TYPE_26:
	218	card->ext_csd.hs_max_dtr = 26000000;
	219	break;
	220	default:
	221	/* MMC v4 spec says this cannot happen */
	222	printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
	223	"support any high-speed modes.\n",
	224	mmc_hostname(card->host));
225	goto out;
226	}
227
7ea239d9 PO	228	out:
	229	kfree(ext_csd);
	230
	231	return err;
	232	}
	233
	234	/*
6abaa0c9 PO	235	* Handle the detection and initialisation of a card.
	236	*
	237	* In the case of a resume, "curcard" will contain the card
	238	* we're trying to reinitialise.
7ea239d9	239	*/
8c75deae	240	static int mmc_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9	241	struct mmc_card *oldcard)
7ea239d9 PO	242	{
	243	struct mmc_card *card;
	244	int err;
	245	u32 cid[4];
	246	unsigned int max_dtr;
	247
	248	BUG_ON(!host);
	249	BUG_ON(!host->claimed);
	250
7ea239d9 PO	251	/*
	252	* Since we're changing the OCR value, we seem to
	253	* need to tell some cards to go back to the idle
	254	* state. We wait 1ms to give cards time to
	255	* respond.
	256	*/
	257	mmc_go_idle(host);
	258
	259	/* The extra bit indicates that we support high capacity */
6abaa0c9 PO	260	err = mmc_send_op_cond(host, ocr \| (1 << 30), NULL);
	261	if (err != MMC_ERR_NONE)
	262	goto err;
7ea239d9 PO	263
	264	/*
	265	* Fetch CID from card.
	266	*/
	267	err = mmc_all_send_cid(host, cid);
	268	if (err != MMC_ERR_NONE)
	269	goto err;
	270
6abaa0c9 PO	271	if (oldcard) {
	272	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
	273	goto err;
	274
	275	card = oldcard;
	276	} else {
	277	/*
	278	* Allocate card structure.
	279	*/
	280	card = mmc_alloc_card(host);
	281	if (IS_ERR(card))
	282	goto err;
7ea239d9	283
6abaa0c9 PO	284	card->type = MMC_TYPE_MMC;
	285	card->rca = 1;
	286	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	287	}
7ea239d9 PO	288
	289	/*
	290	* Set card RCA.
	291	*/
	292	err = mmc_set_relative_addr(card);
	293	if (err != MMC_ERR_NONE)
	294	goto free_card;
	295
	296	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	297
6abaa0c9 PO	298	if (!oldcard) {
	299	/*
	300	* Fetch CSD from card.
	301	*/
	302	err = mmc_send_csd(card, card->raw_csd);
	303	if (err != MMC_ERR_NONE)
	304	goto free_card;
7ea239d9	305
bd766312 PO	306	err = mmc_decode_csd(card);
	307	if (err < 0)
	308	goto free_card;
	309	err = mmc_decode_cid(card);
	310	if (err < 0)
	311	goto free_card;
6abaa0c9	312	}
7ea239d9 PO	313
7ea239d9 PO	314	/*
89a73cf5	315	* Select card, as all following commands rely on that.
7ea239d9 PO	316	*/
	317	err = mmc_select_card(card);
	318	if (err != MMC_ERR_NONE)
	319	goto free_card;
	320
6abaa0c9 PO	321	if (!oldcard) {
	322	/*
	323	* Fetch and process extened CSD.
	324	*/
	325	err = mmc_read_ext_csd(card);
	326	if (err != MMC_ERR_NONE)
	327	goto free_card;
	328	}
7ea239d9	329
89a73cf5 PO	330	/*
	331	* Activate high speed (if supported)
	332	*/
	333	if ((card->ext_csd.hs_max_dtr != 0) &&
	334	(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
	335	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	336	EXT_CSD_HS_TIMING, 1);
	337	if (err != MMC_ERR_NONE)
	338	goto free_card;
	339
	340	mmc_card_set_highspeed(card);
	341
	342	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
	343	}
	344
7ea239d9 PO	345	/*
	346	* Compute bus speed.
	347	*/
	348	max_dtr = (unsigned int)-1;
	349
	350	if (mmc_card_highspeed(card)) {
	351	if (max_dtr > card->ext_csd.hs_max_dtr)
	352	max_dtr = card->ext_csd.hs_max_dtr;
	353	} else if (max_dtr > card->csd.max_dtr) {
	354	max_dtr = card->csd.max_dtr;
	355	}
	356
	357	mmc_set_clock(host, max_dtr);
	358
89a73cf5 PO	359	/*
	360	* Activate wide bus (if supported).
	361	*/
	362	if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
	363	(host->caps & MMC_CAP_4_BIT_DATA)) {
	364	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	365	EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
	366	if (err != MMC_ERR_NONE)
	367	goto free_card;
	368
	369	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	370	}
	371
6abaa0c9 PO	372	if (!oldcard)
	373	host->card = card;
	374
	375	return MMC_ERR_NONE;
	376
	377	free_card:
	378	if (!oldcard)
	379	mmc_remove_card(card);
	380	err:
	381
	382	return MMC_ERR_FAILED;
	383	}
	384
	385	/*
	386	* Host is being removed. Free up the current card.
	387	*/
	388	static void mmc_remove(struct mmc_host *host)
	389	{
	390	BUG_ON(!host);
	391	BUG_ON(!host->card);
	392
	393	mmc_remove_card(host->card);
	394	host->card = NULL;
	395	}
	396
	397	/*
	398	* Card detection callback from host.
	399	*/
	400	static void mmc_detect(struct mmc_host *host)
	401	{
	402	int err;
	403
	404	BUG_ON(!host);
	405	BUG_ON(!host->card);
	406
	407	mmc_claim_host(host);
	408
	409	/*
	410	* Just check if our card has been removed.
	411	*/
	412	err = mmc_send_status(host->card, NULL);
	413
	414	mmc_release_host(host);
	415
	416	if (err != MMC_ERR_NONE) {
4101c16a	417	mmc_remove(host);
6abaa0c9 PO	418
	419	mmc_claim_host(host);
	420	mmc_detach_bus(host);
	421	mmc_release_host(host);
	422	}
	423	}
	424
4101c16a PO	425	MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	426	card->raw_cid[2], card->raw_cid[3]);
	427	MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	428	card->raw_csd[2], card->raw_csd[3]);
	429	MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year);
	430	MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev);
	431	MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev);
	432	MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid);
	433	MMC_ATTR_FN(name, "%s\n", card->cid.prod_name);
	434	MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid);
	435	MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial);
	436
	437	static struct device_attribute mmc_dev_attrs[] = {
	438	MMC_ATTR_RO(cid),
	439	MMC_ATTR_RO(csd),
	440	MMC_ATTR_RO(date),
	441	MMC_ATTR_RO(fwrev),
	442	MMC_ATTR_RO(hwrev),
	443	MMC_ATTR_RO(manfid),
	444	MMC_ATTR_RO(name),
	445	MMC_ATTR_RO(oemid),
	446	MMC_ATTR_RO(serial),
	447	__ATTR_NULL,
	448	};
	449
	450	/*
	451	* Adds sysfs entries as relevant.
	452	*/
	453	static int mmc_sysfs_add(struct mmc_host host, struct mmc_card card)
	454	{
	455	int ret;
	456
	457	ret = mmc_add_attrs(card, mmc_dev_attrs);
	458	if (ret < 0)
	459	return ret;
	460
	461	return 0;
	462	}
	463
	464	/*
	465	* Removes the sysfs entries added by mmc_sysfs_add().
	466	*/
	467	static void mmc_sysfs_remove(struct mmc_host host, struct mmc_card card)
	468	{
	469	mmc_remove_attrs(card, mmc_dev_attrs);
	470	}
	471
6abaa0c9 PO	472	#ifdef CONFIG_MMC_UNSAFE_RESUME
	473
	474	/*
	475	* Suspend callback from host.
	476	*/
	477	static void mmc_suspend(struct mmc_host *host)
	478	{
	479	BUG_ON(!host);
	480	BUG_ON(!host->card);
7ea239d9	481
6abaa0c9 PO	482	mmc_claim_host(host);
	483	mmc_deselect_cards(host);
	484	host->card->state &= ~MMC_STATE_HIGHSPEED;
7ea239d9	485	mmc_release_host(host);
6abaa0c9	486	}
7ea239d9	487
6abaa0c9 PO	488	/*
	489	* Resume callback from host.
	490	*
	491	* This function tries to determine if the same card is still present
	492	* and, if so, restore all state to it.
	493	*/
	494	static void mmc_resume(struct mmc_host *host)
	495	{
	496	int err;
	497
	498	BUG_ON(!host);
	499	BUG_ON(!host->card);
	500
	501	mmc_claim_host(host);
8c75deae	502	err = mmc_init_card(host, host->ocr, host->card);
2986d0bf PO	503	mmc_release_host(host);
2986d0bf PO	504
6abaa0c9	505	if (err != MMC_ERR_NONE) {
4101c16a	506	mmc_remove(host);
2986d0bf PO	507
2986d0bf PO	508	mmc_claim_host(host);
6abaa0c9	509	mmc_detach_bus(host);
2986d0bf	510	mmc_release_host(host);
6abaa0c9 PO	511	}
6abaa0c9 PO	512
6abaa0c9 PO	513	}
	514
	515	#else
	516
	517	#define mmc_suspend NULL
	518	#define mmc_resume NULL
	519
	520	#endif
	521
	522	static const struct mmc_bus_ops mmc_ops = {
	523	.remove = mmc_remove,
	524	.detect = mmc_detect,
4101c16a PO	525	.sysfs_add = mmc_sysfs_add,
4101c16a PO	526	.sysfs_remove = mmc_sysfs_remove,
6abaa0c9 PO	527	.suspend = mmc_suspend,
	528	.resume = mmc_resume,
	529	};
	530
	531	/*
	532	* Starting point for MMC card init.
	533	*/
	534	int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
	535	{
	536	int err;
	537
	538	BUG_ON(!host);
	539	BUG_ON(!host->claimed);
	540
	541	mmc_attach_bus(host, &mmc_ops);
	542
	543	/*
	544	* Sanity check the voltages that the card claims to
	545	* support.
	546	*/
	547	if (ocr & 0x7F) {
	548	printk(KERN_WARNING "%s: card claims to support voltages "
	549	"below the defined range. These will be ignored.\n",
	550	mmc_hostname(host));
	551	ocr &= ~0x7F;
	552	}
	553
	554	host->ocr = mmc_select_voltage(host, ocr);
	555
	556	/*
	557	* Can we support the voltage of the card?
	558	*/
	559	if (!host->ocr)
	560	goto err;
	561
	562	/*
	563	* Detect and init the card.
	564	*/
8c75deae	565	err = mmc_init_card(host, host->ocr, NULL);
6abaa0c9 PO	566	if (err != MMC_ERR_NONE)
	567	goto err;
	568
	569	mmc_release_host(host);
	570
4101c16a	571	err = mmc_add_card(host->card);
7ea239d9	572	if (err)
2986d0bf	573	goto remove_card;
7ea239d9 PO	574
	575	return 0;
	576
2986d0bf	577	remove_card:
6abaa0c9	578	mmc_remove_card(host->card);
7ea239d9	579	host->card = NULL;
2986d0bf	580	mmc_claim_host(host);
7ea239d9 PO	581	err:
	582	mmc_detach_bus(host);
	583	mmc_release_host(host);
	584
	585	return 0;
	586	}
	587