[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(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);
		return -EINVAL;
	}

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