[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / drivers / mmc / core / mmc.c

/*
 *  linux/drivers/mmc/mmc.c
 *
 *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
 *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
 *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/err.h>

#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>

#include "core.h"
#include "sysfs.h"
#include "mmc_ops.h"

static const unsigned int tran_exp[] = {
	10000,		100000,		1000000,	10000000,
	0,		0,		0,		0
};

static const unsigned char tran_mant[] = {
	0,	10,	12,	13,	15,	20,	25,	30,
	35,	40,	45,	50,	55,	60,	70,	80,
};

static const unsigned int tacc_exp[] = {
	1,	10,	100,	1000,	10000,	100000,	1000000, 10000000,
};

static const unsigned int tacc_mant[] = {
	0,	10,	12,	13,	15,	20,	25,	30,
	35,	40,	45,	50,	55,	60,	70,	80,
};

#define UNSTUFF_BITS(resp,start,size)					\
	({								\
		const int __size = size;				\
		const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1;	\
		const int __off = 3 - ((start) / 32);			\
		const int __shft = (start) & 31;			\
		u32 __res;						\
									\
		__res = resp[__off] >> __shft;				\
		if (__size + __shft > 32)				\
			__res |= resp[__off-1] << ((32 - __shft) % 32);	\
		__res & __mask;						\
	})

/*
 * Given the decoded CSD structure, decode the raw CID to our CID structure.
 */
static void 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);
		mmc_card_set_bad(card);
		break;
	}
}

/*
 * Given a 128-bit response, decode to our card CSD structure.
 */
static void 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);
		mmc_card_set_bad(card);
		return;
	}

	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);
}

/*
 * Read and decode extended CSD.
 */
static int mmc_read_ext_csd(struct mmc_card *card)
{
	int err;
	u8 *ext_csd;

	BUG_ON(!card);

	err = MMC_ERR_FAILED;

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

	/*
	 * As the ext_csd is so large and mostly unused, we don't store the
	 * raw block in mmc_card.
	 */
	ext_csd = kmalloc(512, GFP_KERNEL);
	if (!ext_csd) {
		printk(KERN_ERR "%s: could not allocate a buffer to "
			"receive the ext_csd. mmc v4 cards will be "
			"treated as v3.\n", mmc_hostname(card->host));
		return MMC_ERR_FAILED;
	}

	err = mmc_send_ext_csd(card, ext_csd);
	if (err != MMC_ERR_NONE) {
		/*
		 * High capacity cards should have this "magic" size
		 * stored in their CSD.
		 */
		if (card->csd.capacity == (4096 * 512)) {
			printk(KERN_ERR "%s: unable to read EXT_CSD "
				"on a possible high capacity card. "
				"Card will be ignored.\n",
				mmc_hostname(card->host));
		} else {
			printk(KERN_WARNING "%s: unable to read "
				"EXT_CSD, performance might "
				"suffer.\n",
				mmc_hostname(card->host));
			err = MMC_ERR_NONE;
		}
		goto out;
	}

	card->ext_csd.sectors =
		ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
		ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
		ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
		ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
	if (card->ext_csd.sectors)
		mmc_card_set_blockaddr(card);

	switch (ext_csd[EXT_CSD_CARD_TYPE]) {
	case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
		card->ext_csd.hs_max_dtr = 52000000;
		break;
	case EXT_CSD_CARD_TYPE_26:
		card->ext_csd.hs_max_dtr = 26000000;
		break;
	default:
		/* MMC v4 spec says this cannot happen */
		printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
			"support any high-speed modes.\n",
			mmc_hostname(card->host));
		goto out;
	}

out:
	kfree(ext_csd);

	return err;
}

/*
 * Handle the detection and initialisation of a card.
 *
 * In the case of a resume, "curcard" will contain the card
 * we're trying to reinitialise.
 */
static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
	struct mmc_card *oldcard)
{
	struct mmc_card *card;
	int err;
	u32 cid[4];
	unsigned int max_dtr;

	BUG_ON(!host);
	BUG_ON(!host->claimed);

	/*
	 * Since we're changing the OCR value, we seem to
	 * need to tell some cards to go back to the idle
	 * state.  We wait 1ms to give cards time to
	 * respond.
	 */
	mmc_go_idle(host);

	/* The extra bit indicates that we support high capacity */
	err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
	if (err != MMC_ERR_NONE)
		goto err;

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

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

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

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

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

	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);

	if (!oldcard) {
		/*
		 * Fetch CSD from card.
		 */
		err = mmc_send_csd(card, card->raw_csd);
		if (err != MMC_ERR_NONE)
			goto free_card;

		mmc_decode_csd(card);
		mmc_decode_cid(card);
	}

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

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

	/*
	 * Activate high speed (if supported)
	 */
	if ((card->ext_csd.hs_max_dtr != 0) &&
		(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
			EXT_CSD_HS_TIMING, 1);
		if (err != MMC_ERR_NONE)
			goto free_card;

		mmc_card_set_highspeed(card);

		mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
	}

	/*
	 * Compute bus speed.
	 */
	max_dtr = (unsigned int)-1;

	if (mmc_card_highspeed(card)) {
		if (max_dtr > card->ext_csd.hs_max_dtr)
			max_dtr = card->ext_csd.hs_max_dtr;
	} else if (max_dtr > card->csd.max_dtr) {
		max_dtr = card->csd.max_dtr;
	}

	mmc_set_clock(host, max_dtr);

	/*
	 * Activate wide bus (if supported).
	 */
	if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
		(host->caps & MMC_CAP_4_BIT_DATA)) {
		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
			EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
		if (err != MMC_ERR_NONE)
			goto free_card;

		mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	}

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

	return MMC_ERR_NONE;

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

	return MMC_ERR_FAILED;
}

/*
 * Host is being removed. Free up the current card.
 */
static void mmc_remove(struct mmc_host *host)
{
	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_remove_card(host->card);
	host->card = NULL;
}

/*
 * Card detection callback from host.
 */
static void mmc_detect(struct mmc_host *host)
{
	int err;

	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);

	/*
	 * Just check if our card has been removed.
	 */
	err = mmc_send_status(host->card, NULL);

	mmc_release_host(host);

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

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

#ifdef CONFIG_MMC_UNSAFE_RESUME

/*
 * Suspend callback from host.
 */
static void mmc_suspend(struct mmc_host *host)
{
	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);
	mmc_deselect_cards(host);
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_release_host(host);
}

/*
 * Resume callback from host.
 *
 * This function tries to determine if the same card is still present
 * and, if so, restore all state to it.
 */
static void mmc_resume(struct mmc_host *host)
{
	int err;

	BUG_ON(!host);
	BUG_ON(!host->card);

	mmc_claim_host(host);

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

		mmc_detach_bus(host);
	}

	mmc_release_host(host);
}

#else

#define mmc_suspend NULL
#define mmc_resume NULL

#endif

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

/*
 * Starting point for MMC card init.
 */
int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
{
	int err;

	BUG_ON(!host);
	BUG_ON(!host->claimed);

	mmc_attach_bus(host, &mmc_ops);

	/*
	 * Sanity check the voltages that the card claims to
	 * support.
	 */
	if (ocr & 0x7F) {
		printk(KERN_WARNING "%s: card claims to support voltages "
		       "below the defined range. These will be ignored.\n",
		       mmc_hostname(host));
		ocr &= ~0x7F;
	}

	host->ocr = mmc_select_voltage(host, ocr);

	/*
	 * Can we support the voltage of the card?
	 */
	if (!host->ocr)
		goto err;

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

	mmc_release_host(host);

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

	return 0;

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

	return 0;
}
Commit	Line	Data
7ea239d9 PO	1	/*
	2	* linux/drivers/mmc/mmc.c
	3	*
	4	* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
	5	* Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
	6	* MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/err.h>
	14
	15	#include <linux/mmc/host.h>
	16	#include <linux/mmc/card.h>
	17	#include <linux/mmc/mmc.h>
	18
	19	#include "core.h"
	20	#include "sysfs.h"
	21	#include "mmc_ops.h"
	22
	23	static const unsigned int tran_exp[] = {
	24	10000, 100000, 1000000, 10000000,
	25	0, 0, 0, 0
	26	};
	27
	28	static const unsigned char tran_mant[] = {
	29	0, 10, 12, 13, 15, 20, 25, 30,
	30	35, 40, 45, 50, 55, 60, 70, 80,
	31	};
	32
	33	static const unsigned int tacc_exp[] = {
	34	1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
	35	};
	36
	37	static const unsigned int tacc_mant[] = {
	38	0, 10, 12, 13, 15, 20, 25, 30,
	39	35, 40, 45, 50, 55, 60, 70, 80,
	40	};
	41
	42	#define UNSTUFF_BITS(resp,start,size) \
	43	({ \
	44	const int __size = size; \
	45	const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
	46	const int __off = 3 - ((start) / 32); \
	47	const int __shft = (start) & 31; \
	48	u32 __res; \
	49	\
	50	__res = resp[__off] >> __shft; \
	51	if (__size + __shft > 32) \
	52	__res \|= resp[__off-1] << ((32 - __shft) % 32); \
	53	__res & __mask; \
	54	})
	55
	56	/*
	57	* Given the decoded CSD structure, decode the raw CID to our CID structure.
	58	*/
	59	static void mmc_decode_cid(struct mmc_card *card)
	60	{
	61	u32 *resp = card->raw_cid;
	62
	63	/*
	64	* The selection of the format here is based upon published
65	* specs from sandisk and from what people have reported.
66	*/
67	switch (card->csd.mmca_vsn) {
68	case 0: /* MMC v1.0 - v1.2 */
69	case 1: /* MMC v1.4 */
70	card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
71	card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
72	card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
73	card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
74	card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
75	card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
76	card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
77	card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
78	card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
79	card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
80	card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
81	card->cid.month = UNSTUFF_BITS(resp, 12, 4);
82	card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
83	break;
84
85	case 2: /* MMC v2.0 - v2.2 */
86	case 3: /* MMC v3.1 - v3.3 */
87	case 4: /* MMC v4 */
88	card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
89	card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
90	card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
91	card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
92	card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
93	card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
94	card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
95	card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
96	card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
97	card->cid.month = UNSTUFF_BITS(resp, 12, 4);
98	card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
99	break;
100
101	default:
102	printk("%s: card has unknown MMCA version %d\n",
103	mmc_hostname(card->host), card->csd.mmca_vsn);
104	mmc_card_set_bad(card);
105	break;
106	}
107	}
108
109	/*
110	* Given a 128-bit response, decode to our card CSD structure.
111	*/
112	static void mmc_decode_csd(struct mmc_card *card)
113	{
114	struct mmc_csd *csd = &card->csd;
115	unsigned int e, m, csd_struct;
116	u32 *resp = card->raw_csd;
117
118	/*
119	* We only understand CSD structure v1.1 and v1.2.
120	* v1.2 has extra information in bits 15, 11 and 10.
121	*/
122	csd_struct = UNSTUFF_BITS(resp, 126, 2);
123	if (csd_struct != 1 && csd_struct != 2) {
124	printk("%s: unrecognised CSD structure version %d\n",
125	mmc_hostname(card->host), csd_struct);
126	mmc_card_set_bad(card);
127	return;
128	}
129
130	csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
131	m = UNSTUFF_BITS(resp, 115, 4);
132	e = UNSTUFF_BITS(resp, 112, 3);
133	csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
134	csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
135
136	m = UNSTUFF_BITS(resp, 99, 4);
137	e = UNSTUFF_BITS(resp, 96, 3);
138	csd->max_dtr = tran_exp[e] * tran_mant[m];
139	csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
140
141	e = UNSTUFF_BITS(resp, 47, 3);
142	m = UNSTUFF_BITS(resp, 62, 12);
143	csd->capacity = (1 + m) << (e + 2);
144
145	csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
146	csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
147	csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
148	csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
149	csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
150	csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
151	csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
152	}
153
154	/*
89a73cf5	155	* Read and decode extended CSD.
7ea239d9	156	*/
89a73cf5	157	static int mmc_read_ext_csd(struct mmc_card *card)
7ea239d9 PO	158	{
	159	int err;
	160	u8 *ext_csd;
	161
	162	BUG_ON(!card);
	163
	164	err = MMC_ERR_FAILED;
	165
	166	if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
	167	return MMC_ERR_NONE;
	168
	169	/*
	170	* As the ext_csd is so large and mostly unused, we don't store the
	171	* raw block in mmc_card.
	172	*/
	173	ext_csd = kmalloc(512, GFP_KERNEL);
	174	if (!ext_csd) {
	175	printk(KERN_ERR "%s: could not allocate a buffer to "
	176	"receive the ext_csd. mmc v4 cards will be "
	177	"treated as v3.\n", mmc_hostname(card->host));
	178	return MMC_ERR_FAILED;
	179	}
	180
	181	err = mmc_send_ext_csd(card, ext_csd);
	182	if (err != MMC_ERR_NONE) {
	183	/*
	184	* High capacity cards should have this "magic" size
	185	* stored in their CSD.
	186	*/
	187	if (card->csd.capacity == (4096 * 512)) {
	188	printk(KERN_ERR "%s: unable to read EXT_CSD "
	189	"on a possible high capacity card. "
	190	"Card will be ignored.\n",
	191	mmc_hostname(card->host));
	192	} else {
	193	printk(KERN_WARNING "%s: unable to read "
	194	"EXT_CSD, performance might "
	195	"suffer.\n",
	196	mmc_hostname(card->host));
	197	err = MMC_ERR_NONE;
	198	}
	199	goto out;
	200	}
	201
	202	card->ext_csd.sectors =
	203	ext_csd[EXT_CSD_SEC_CNT + 0] << 0 \|
	204	ext_csd[EXT_CSD_SEC_CNT + 1] << 8 \|
	205	ext_csd[EXT_CSD_SEC_CNT + 2] << 16 \|
	206	ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
	207	if (card->ext_csd.sectors)
	208	mmc_card_set_blockaddr(card);
	209
	210	switch (ext_csd[EXT_CSD_CARD_TYPE]) {
	211	case EXT_CSD_CARD_TYPE_52 \| EXT_CSD_CARD_TYPE_26:
	212	card->ext_csd.hs_max_dtr = 52000000;
	213	break;
	214	case EXT_CSD_CARD_TYPE_26:
	215	card->ext_csd.hs_max_dtr = 26000000;
	216	break;
	217	default:
	218	/* MMC v4 spec says this cannot happen */
	219	printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
	220	"support any high-speed modes.\n",
	221	mmc_hostname(card->host));
222	goto out;
223	}
224
7ea239d9 PO	225	out:
	226	kfree(ext_csd);
	227
	228	return err;
	229	}
	230
	231	/*
6abaa0c9 PO	232	* Handle the detection and initialisation of a card.
	233	*
	234	* In the case of a resume, "curcard" will contain the card
	235	* we're trying to reinitialise.
7ea239d9	236	*/
6abaa0c9 PO	237	static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9 PO	238	struct mmc_card *oldcard)
7ea239d9 PO	239	{
	240	struct mmc_card *card;
	241	int err;
	242	u32 cid[4];
	243	unsigned int max_dtr;
	244
	245	BUG_ON(!host);
	246	BUG_ON(!host->claimed);
	247
7ea239d9 PO	248	/*
	249	* Since we're changing the OCR value, we seem to
	250	* need to tell some cards to go back to the idle
	251	* state. We wait 1ms to give cards time to
	252	* respond.
	253	*/
	254	mmc_go_idle(host);
	255
	256	/* The extra bit indicates that we support high capacity */
6abaa0c9 PO	257	err = mmc_send_op_cond(host, ocr \| (1 << 30), NULL);
	258	if (err != MMC_ERR_NONE)
	259	goto err;
7ea239d9 PO	260
	261	/*
	262	* Fetch CID from card.
	263	*/
	264	err = mmc_all_send_cid(host, cid);
	265	if (err != MMC_ERR_NONE)
	266	goto err;
	267
6abaa0c9 PO	268	if (oldcard) {
	269	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
	270	goto err;
	271
	272	card = oldcard;
	273	} else {
	274	/*
	275	* Allocate card structure.
	276	*/
	277	card = mmc_alloc_card(host);
	278	if (IS_ERR(card))
	279	goto err;
7ea239d9	280
6abaa0c9 PO	281	card->type = MMC_TYPE_MMC;
	282	card->rca = 1;
	283	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	284	}
7ea239d9 PO	285
	286	/*
	287	* Set card RCA.
	288	*/
	289	err = mmc_set_relative_addr(card);
	290	if (err != MMC_ERR_NONE)
	291	goto free_card;
	292
	293	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	294
6abaa0c9 PO	295	if (!oldcard) {
	296	/*
	297	* Fetch CSD from card.
	298	*/
	299	err = mmc_send_csd(card, card->raw_csd);
	300	if (err != MMC_ERR_NONE)
	301	goto free_card;
7ea239d9	302
6abaa0c9 PO	303	mmc_decode_csd(card);
	304	mmc_decode_cid(card);
	305	}
7ea239d9 PO	306
7ea239d9 PO	307	/*
89a73cf5	308	* Select card, as all following commands rely on that.
7ea239d9 PO	309	*/
	310	err = mmc_select_card(card);
	311	if (err != MMC_ERR_NONE)
	312	goto free_card;
	313
6abaa0c9 PO	314	if (!oldcard) {
	315	/*
	316	* Fetch and process extened CSD.
	317	*/
	318	err = mmc_read_ext_csd(card);
	319	if (err != MMC_ERR_NONE)
	320	goto free_card;
	321	}
7ea239d9	322
89a73cf5 PO	323	/*
	324	* Activate high speed (if supported)
	325	*/
	326	if ((card->ext_csd.hs_max_dtr != 0) &&
	327	(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
	328	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	329	EXT_CSD_HS_TIMING, 1);
	330	if (err != MMC_ERR_NONE)
	331	goto free_card;
	332
	333	mmc_card_set_highspeed(card);
	334
	335	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
	336	}
	337
7ea239d9 PO	338	/*
	339	* Compute bus speed.
	340	*/
	341	max_dtr = (unsigned int)-1;
	342
	343	if (mmc_card_highspeed(card)) {
	344	if (max_dtr > card->ext_csd.hs_max_dtr)
	345	max_dtr = card->ext_csd.hs_max_dtr;
	346	} else if (max_dtr > card->csd.max_dtr) {
	347	max_dtr = card->csd.max_dtr;
	348	}
	349
	350	mmc_set_clock(host, max_dtr);
	351
89a73cf5 PO	352	/*
	353	* Activate wide bus (if supported).
	354	*/
	355	if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
	356	(host->caps & MMC_CAP_4_BIT_DATA)) {
	357	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
	358	EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
	359	if (err != MMC_ERR_NONE)
	360	goto free_card;
	361
	362	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	363	}
	364
6abaa0c9 PO	365	if (!oldcard)
	366	host->card = card;
	367
	368	return MMC_ERR_NONE;
	369
	370	free_card:
	371	if (!oldcard)
	372	mmc_remove_card(card);
	373	err:
	374
	375	return MMC_ERR_FAILED;
	376	}
	377
	378	/*
	379	* Host is being removed. Free up the current card.
	380	*/
	381	static void mmc_remove(struct mmc_host *host)
	382	{
	383	BUG_ON(!host);
	384	BUG_ON(!host->card);
	385
	386	mmc_remove_card(host->card);
	387	host->card = NULL;
	388	}
	389
	390	/*
	391	* Card detection callback from host.
	392	*/
	393	static void mmc_detect(struct mmc_host *host)
	394	{
	395	int err;
	396
	397	BUG_ON(!host);
	398	BUG_ON(!host->card);
	399
	400	mmc_claim_host(host);
	401
	402	/*
	403	* Just check if our card has been removed.
	404	*/
	405	err = mmc_send_status(host->card, NULL);
	406
	407	mmc_release_host(host);
	408
	409	if (err != MMC_ERR_NONE) {
	410	mmc_remove_card(host->card);
	411	host->card = NULL;
	412
	413	mmc_claim_host(host);
	414	mmc_detach_bus(host);
	415	mmc_release_host(host);
	416	}
	417	}
	418
	419	#ifdef CONFIG_MMC_UNSAFE_RESUME
	420
	421	/*
	422	* Suspend callback from host.
	423	*/
	424	static void mmc_suspend(struct mmc_host *host)
	425	{
	426	BUG_ON(!host);
	427	BUG_ON(!host->card);
7ea239d9	428
6abaa0c9 PO	429	mmc_claim_host(host);
	430	mmc_deselect_cards(host);
	431	host->card->state &= ~MMC_STATE_HIGHSPEED;
7ea239d9	432	mmc_release_host(host);
6abaa0c9	433	}
7ea239d9	434
6abaa0c9 PO	435	/*
	436	* Resume callback from host.
	437	*
	438	* This function tries to determine if the same card is still present
	439	* and, if so, restore all state to it.
	440	*/
	441	static void mmc_resume(struct mmc_host *host)
	442	{
	443	int err;
	444
	445	BUG_ON(!host);
	446	BUG_ON(!host->card);
	447
	448	mmc_claim_host(host);
	449
	450	err = mmc_sd_init_card(host, host->ocr, host->card);
	451	if (err != MMC_ERR_NONE) {
	452	mmc_remove_card(host->card);
	453	host->card = NULL;
	454
	455	mmc_detach_bus(host);
	456	}
	457
	458	mmc_release_host(host);
	459	}
	460
	461	#else
	462
	463	#define mmc_suspend NULL
	464	#define mmc_resume NULL
	465
	466	#endif
	467
	468	static const struct mmc_bus_ops mmc_ops = {
	469	.remove = mmc_remove,
	470	.detect = mmc_detect,
	471	.suspend = mmc_suspend,
	472	.resume = mmc_resume,
	473	};
	474
	475	/*
	476	* Starting point for MMC card init.
	477	*/
	478	int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
	479	{
	480	int err;
	481
	482	BUG_ON(!host);
	483	BUG_ON(!host->claimed);
	484
	485	mmc_attach_bus(host, &mmc_ops);
	486
	487	/*
	488	* Sanity check the voltages that the card claims to
	489	* support.
	490	*/
	491	if (ocr & 0x7F) {
	492	printk(KERN_WARNING "%s: card claims to support voltages "
	493	"below the defined range. These will be ignored.\n",
	494	mmc_hostname(host));
	495	ocr &= ~0x7F;
	496	}
	497
	498	host->ocr = mmc_select_voltage(host, ocr);
499
500	/*
501	* Can we support the voltage of the card?
502	*/
503	if (!host->ocr)
504	goto err;
505
506	/*
507	* Detect and init the card.
508	*/
509	err = mmc_sd_init_card(host, host->ocr, NULL);
510	if (err != MMC_ERR_NONE)
511	goto err;
512
513	mmc_release_host(host);
514
515	err = mmc_register_card(host->card);
7ea239d9 PO	516	if (err)
	517	goto reclaim_host;
	518
	519	return 0;
	520
	521	reclaim_host:
	522	mmc_claim_host(host);
6abaa0c9	523	mmc_remove_card(host->card);
7ea239d9 PO	524	host->card = NULL;
	525	err:
	526	mmc_detach_bus(host);
	527	mmc_release_host(host);
	528
	529	return 0;
	530	}
	531