[deliverable/linux.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(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;
}

/*
 * 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);
		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);
	}
}

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);
	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,
	.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);
	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"
	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:
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;
d7604d76	164	unsigned int ext_csd_struct;
7ea239d9 PO	165
	166	BUG_ON(!card);
	167
7ea239d9	168	if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
17b0429d	169	return 0;
7ea239d9 PO	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 "
adf66a0d	178	"receive the ext_csd.\n", mmc_hostname(card->host));
17b0429d	179	return -ENOMEM;
7ea239d9 PO	180	}
	181
	182	err = mmc_send_ext_csd(card, ext_csd);
17b0429d	183	if (err) {
adf66a0d PO	184	/*
	185	* We all hosts that cannot perform the command
	186	* to fail more gracefully
	187	*/
	188	if (err != -EINVAL)
	189	goto out;
	190
7ea239d9 PO	191	/*
	192	* High capacity cards should have this "magic" size
	193	* stored in their CSD.
	194	*/
	195	if (card->csd.capacity == (4096 * 512)) {
	196	printk(KERN_ERR "%s: unable to read EXT_CSD "
	197	"on a possible high capacity card. "
	198	"Card will be ignored.\n",
	199	mmc_hostname(card->host));
	200	} else {
	201	printk(KERN_WARNING "%s: unable to read "
	202	"EXT_CSD, performance might "
	203	"suffer.\n",
	204	mmc_hostname(card->host));
17b0429d	205	err = 0;
7ea239d9	206	}
adf66a0d	207
7ea239d9 PO	208	goto out;
	209	}
	210
d7604d76 PO	211	ext_csd_struct = ext_csd[EXT_CSD_REV];
d7604d76 PO	212	if (ext_csd_struct > 2) {
8fdd8521 PO	213	printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
	214	"version %d\n", mmc_hostname(card->host),
	215	ext_csd_struct);
00cedfa6 FM	216	err = -EINVAL;
00cedfa6 FM	217	goto out;
d7604d76 PO	218	}
	219
	220	if (ext_csd_struct >= 2) {
	221	card->ext_csd.sectors =
	222	ext_csd[EXT_CSD_SEC_CNT + 0] << 0 \|
	223	ext_csd[EXT_CSD_SEC_CNT + 1] << 8 \|
	224	ext_csd[EXT_CSD_SEC_CNT + 2] << 16 \|
	225	ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
	226	if (card->ext_csd.sectors)
	227	mmc_card_set_blockaddr(card);
	228	}
7ea239d9 PO	229
	230	switch (ext_csd[EXT_CSD_CARD_TYPE]) {
	231	case EXT_CSD_CARD_TYPE_52 \| EXT_CSD_CARD_TYPE_26:
	232	card->ext_csd.hs_max_dtr = 52000000;
	233	break;
	234	case EXT_CSD_CARD_TYPE_26:
	235	card->ext_csd.hs_max_dtr = 26000000;
	236	break;
	237	default:
	238	/* MMC v4 spec says this cannot happen */
	239	printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
	240	"support any high-speed modes.\n",
	241	mmc_hostname(card->host));
	242	goto out;
	243	}
	244
7ea239d9 PO	245	out:
	246	kfree(ext_csd);
	247
	248	return err;
	249	}
	250
	251	/*
6abaa0c9 PO	252	* Handle the detection and initialisation of a card.
	253	*
	254	* In the case of a resume, "curcard" will contain the card
	255	* we're trying to reinitialise.
7ea239d9	256	*/
8c75deae	257	static int mmc_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9	258	struct mmc_card *oldcard)
7ea239d9 PO	259	{
	260	struct mmc_card *card;
	261	int err;
	262	u32 cid[4];
	263	unsigned int max_dtr;
	264
	265	BUG_ON(!host);
d84075c8	266	WARN_ON(!host->claimed);
7ea239d9	267
7ea239d9 PO	268	/*
	269	* Since we're changing the OCR value, we seem to
	270	* need to tell some cards to go back to the idle
	271	* state. We wait 1ms to give cards time to
	272	* respond.
	273	*/
	274	mmc_go_idle(host);
	275
	276	/* The extra bit indicates that we support high capacity */
6abaa0c9	277	err = mmc_send_op_cond(host, ocr \| (1 << 30), NULL);
17b0429d	278	if (err)
6abaa0c9	279	goto err;
7ea239d9	280
af517150 DB	281	/*
	282	* For SPI, enable CRC as appropriate.
	283	*/
	284	if (mmc_host_is_spi(host)) {
	285	err = mmc_spi_set_crc(host, use_spi_crc);
	286	if (err)
	287	goto err;
	288	}
	289
7ea239d9 PO	290	/*
	291	* Fetch CID from card.
	292	*/
af517150 DB	293	if (mmc_host_is_spi(host))
	294	err = mmc_send_cid(host, cid);
	295	else
	296	err = mmc_all_send_cid(host, cid);
17b0429d	297	if (err)
7ea239d9 PO	298	goto err;
7ea239d9 PO	299
6abaa0c9	300	if (oldcard) {
adf66a0d PO	301	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
adf66a0d PO	302	err = -ENOENT;
6abaa0c9	303	goto err;
adf66a0d	304	}
6abaa0c9 PO	305
	306	card = oldcard;
	307	} else {
	308	/*
	309	* Allocate card structure.
	310	*/
	311	card = mmc_alloc_card(host);
adf66a0d PO	312	if (IS_ERR(card)) {
adf66a0d PO	313	err = PTR_ERR(card);
6abaa0c9	314	goto err;
adf66a0d	315	}
7ea239d9	316
6abaa0c9 PO	317	card->type = MMC_TYPE_MMC;
	318	card->rca = 1;
	319	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	320	}
7ea239d9 PO	321
7ea239d9 PO	322	/*
af517150	323	* For native busses: set card RCA and quit open drain mode.
7ea239d9	324	*/
af517150 DB	325	if (!mmc_host_is_spi(host)) {
	326	err = mmc_set_relative_addr(card);
	327	if (err)
	328	goto free_card;
7ea239d9	329
af517150 DB	330	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
af517150 DB	331	}
7ea239d9	332
6abaa0c9 PO	333	if (!oldcard) {
	334	/*
	335	* Fetch CSD from card.
	336	*/
	337	err = mmc_send_csd(card, card->raw_csd);
17b0429d	338	if (err)
6abaa0c9	339	goto free_card;
7ea239d9	340
bd766312	341	err = mmc_decode_csd(card);
adf66a0d	342	if (err)
bd766312 PO	343	goto free_card;
bd766312 PO	344	err = mmc_decode_cid(card);
adf66a0d	345	if (err)
bd766312	346	goto free_card;
6abaa0c9	347	}
7ea239d9 PO	348
7ea239d9 PO	349	/*
89a73cf5	350	* Select card, as all following commands rely on that.
7ea239d9	351	*/
af517150 DB	352	if (!mmc_host_is_spi(host)) {
	353	err = mmc_select_card(card);
	354	if (err)
	355	goto free_card;
	356	}
7ea239d9	357
6abaa0c9 PO	358	if (!oldcard) {
6abaa0c9 PO	359	/*
af517150	360	* Fetch and process extended CSD.
6abaa0c9 PO	361	*/
6abaa0c9 PO	362	err = mmc_read_ext_csd(card);
17b0429d	363	if (err)
6abaa0c9 PO	364	goto free_card;
6abaa0c9 PO	365	}
7ea239d9	366
89a73cf5 PO	367	/*
	368	* Activate high speed (if supported)
	369	*/
	370	if ((card->ext_csd.hs_max_dtr != 0) &&
	371	(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
	372	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	373	EXT_CSD_HS_TIMING, 1);
17b0429d	374	if (err)
89a73cf5 PO	375	goto free_card;
	376
	377	mmc_card_set_highspeed(card);
	378
	379	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
	380	}
	381
7ea239d9 PO	382	/*
	383	* Compute bus speed.
	384	*/
	385	max_dtr = (unsigned int)-1;
	386
	387	if (mmc_card_highspeed(card)) {
	388	if (max_dtr > card->ext_csd.hs_max_dtr)
	389	max_dtr = card->ext_csd.hs_max_dtr;
	390	} else if (max_dtr > card->csd.max_dtr) {
	391	max_dtr = card->csd.max_dtr;
	392	}
	393
	394	mmc_set_clock(host, max_dtr);
	395
89a73cf5 PO	396	/*
	397	* Activate wide bus (if supported).
	398	*/
	399	if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
	400	(host->caps & MMC_CAP_4_BIT_DATA)) {
	401	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	402	EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
17b0429d	403	if (err)
89a73cf5 PO	404	goto free_card;
	405
	406	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	407	}
	408
6abaa0c9 PO	409	if (!oldcard)
	410	host->card = card;
	411
17b0429d	412	return 0;
6abaa0c9 PO	413
	414	free_card:
	415	if (!oldcard)
	416	mmc_remove_card(card);
	417	err:
	418
adf66a0d	419	return err;
6abaa0c9 PO	420	}
	421
	422	/*
	423	* Host is being removed. Free up the current card.
	424	*/
	425	static void mmc_remove(struct mmc_host *host)
	426	{
	427	BUG_ON(!host);
	428	BUG_ON(!host->card);
	429
	430	mmc_remove_card(host->card);
	431	host->card = NULL;
	432	}
	433
	434	/*
	435	* Card detection callback from host.
	436	*/
	437	static void mmc_detect(struct mmc_host *host)
	438	{
	439	int err;
	440
	441	BUG_ON(!host);
	442	BUG_ON(!host->card);
	443
	444	mmc_claim_host(host);
	445
	446	/*
	447	* Just check if our card has been removed.
	448	*/
	449	err = mmc_send_status(host->card, NULL);
	450
	451	mmc_release_host(host);
	452
17b0429d	453	if (err) {
4101c16a	454	mmc_remove(host);
6abaa0c9 PO	455
	456	mmc_claim_host(host);
	457	mmc_detach_bus(host);
	458	mmc_release_host(host);
	459	}
	460	}
	461
4101c16a PO	462	MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	463	card->raw_cid[2], card->raw_cid[3]);
	464	MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	465	card->raw_csd[2], card->raw_csd[3]);
	466	MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year);
	467	MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev);
	468	MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev);
	469	MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid);
	470	MMC_ATTR_FN(name, "%s\n", card->cid.prod_name);
	471	MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid);
	472	MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial);
	473
	474	static struct device_attribute mmc_dev_attrs[] = {
	475	MMC_ATTR_RO(cid),
	476	MMC_ATTR_RO(csd),
	477	MMC_ATTR_RO(date),
	478	MMC_ATTR_RO(fwrev),
	479	MMC_ATTR_RO(hwrev),
	480	MMC_ATTR_RO(manfid),
	481	MMC_ATTR_RO(name),
	482	MMC_ATTR_RO(oemid),
	483	MMC_ATTR_RO(serial),
	484	__ATTR_NULL,
	485	};
	486
	487	/*
	488	* Adds sysfs entries as relevant.
	489	*/
	490	static int mmc_sysfs_add(struct mmc_host host, struct mmc_card card)
	491	{
	492	int ret;
	493
	494	ret = mmc_add_attrs(card, mmc_dev_attrs);
	495	if (ret < 0)
	496	return ret;
	497
	498	return 0;
	499	}
	500
	501	/*
	502	* Removes the sysfs entries added by mmc_sysfs_add().
	503	*/
	504	static void mmc_sysfs_remove(struct mmc_host host, struct mmc_card card)
	505	{
	506	mmc_remove_attrs(card, mmc_dev_attrs);
	507	}
	508
6abaa0c9 PO	509	#ifdef CONFIG_MMC_UNSAFE_RESUME
	510
	511	/*
	512	* Suspend callback from host.
	513	*/
	514	static void mmc_suspend(struct mmc_host *host)
	515	{
	516	BUG_ON(!host);
	517	BUG_ON(!host->card);
7ea239d9	518
6abaa0c9	519	mmc_claim_host(host);
af517150 DB	520	if (!mmc_host_is_spi(host))
af517150 DB	521	mmc_deselect_cards(host);
6abaa0c9	522	host->card->state &= ~MMC_STATE_HIGHSPEED;
7ea239d9	523	mmc_release_host(host);
6abaa0c9	524	}
7ea239d9	525
6abaa0c9 PO	526	/*
	527	* Resume callback from host.
	528	*
	529	* This function tries to determine if the same card is still present
	530	* and, if so, restore all state to it.
	531	*/
	532	static void mmc_resume(struct mmc_host *host)
	533	{
	534	int err;
	535
	536	BUG_ON(!host);
	537	BUG_ON(!host->card);
	538
	539	mmc_claim_host(host);
8c75deae	540	err = mmc_init_card(host, host->ocr, host->card);
2986d0bf PO	541	mmc_release_host(host);
2986d0bf PO	542
17b0429d	543	if (err) {
4101c16a	544	mmc_remove(host);
2986d0bf PO	545
2986d0bf PO	546	mmc_claim_host(host);
6abaa0c9	547	mmc_detach_bus(host);
2986d0bf	548	mmc_release_host(host);
6abaa0c9 PO	549	}
6abaa0c9 PO	550
6abaa0c9 PO	551	}
	552
	553	#else
	554
	555	#define mmc_suspend NULL
	556	#define mmc_resume NULL
	557
	558	#endif
	559
	560	static const struct mmc_bus_ops mmc_ops = {
	561	.remove = mmc_remove,
	562	.detect = mmc_detect,
4101c16a PO	563	.sysfs_add = mmc_sysfs_add,
4101c16a PO	564	.sysfs_remove = mmc_sysfs_remove,
6abaa0c9 PO	565	.suspend = mmc_suspend,
	566	.resume = mmc_resume,
	567	};
	568
	569	/*
	570	* Starting point for MMC card init.
	571	*/
	572	int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
	573	{
	574	int err;
	575
	576	BUG_ON(!host);
d84075c8	577	WARN_ON(!host->claimed);
6abaa0c9 PO	578
	579	mmc_attach_bus(host, &mmc_ops);
	580
af517150 DB	581	/*
	582	* We need to get OCR a different way for SPI.
	583	*/
	584	if (mmc_host_is_spi(host)) {
	585	err = mmc_spi_read_ocr(host, 1, &ocr);
	586	if (err)
	587	goto err;
	588	}
	589
6abaa0c9 PO	590	/*
	591	* Sanity check the voltages that the card claims to
	592	* support.
	593	*/
	594	if (ocr & 0x7F) {
	595	printk(KERN_WARNING "%s: card claims to support voltages "
	596	"below the defined range. These will be ignored.\n",
	597	mmc_hostname(host));
	598	ocr &= ~0x7F;
	599	}
	600
	601	host->ocr = mmc_select_voltage(host, ocr);
	602
	603	/*
	604	* Can we support the voltage of the card?
	605	*/
109b5bed PO	606	if (!host->ocr) {
109b5bed PO	607	err = -EINVAL;
6abaa0c9	608	goto err;
109b5bed	609	}
6abaa0c9 PO	610
	611	/*
	612	* Detect and init the card.
	613	*/
8c75deae	614	err = mmc_init_card(host, host->ocr, NULL);
17b0429d	615	if (err)
6abaa0c9 PO	616	goto err;
	617
	618	mmc_release_host(host);
	619
4101c16a	620	err = mmc_add_card(host->card);
7ea239d9	621	if (err)
2986d0bf	622	goto remove_card;
7ea239d9 PO	623
	624	return 0;
	625
2986d0bf	626	remove_card:
6abaa0c9	627	mmc_remove_card(host->card);
7ea239d9	628	host->card = NULL;
2986d0bf	629	mmc_claim_host(host);
7ea239d9 PO	630	err:
	631	mmc_detach_bus(host);
	632	mmc_release_host(host);
	633
109b5bed PO	634	printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
	635	mmc_hostname(host), err);
	636
adf66a0d	637	return err;
7ea239d9 PO	638	}
7ea239d9 PO	639