[deliverable/linux.git] / drivers / mmc / core / sd.c

/*
 *  linux/drivers/mmc/sd.c
 *
 *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
 *  SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
 *  Copyright (C) 2005-2007 Pierre Ossman, 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"
#include "sd_ops.h"

#include "core.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;

	memset(&card->cid, 0, sizeof(struct mmc_cid));

	/*
	 * SD doesn't currently have a version field so we will
	 * have to assume we can parse this.
	 */
	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.hwrev			= UNSTUFF_BITS(resp, 60, 4);
	card->cid.fwrev			= UNSTUFF_BITS(resp, 56, 4);
	card->cid.serial		= UNSTUFF_BITS(resp, 24, 32);
	card->cid.year			= UNSTUFF_BITS(resp, 12, 8);
	card->cid.month			= UNSTUFF_BITS(resp, 8, 4);

	card->cid.year += 2000; /* SD cards year offset */
}

/*
 * 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;

	csd_struct = UNSTUFF_BITS(resp, 126, 2);

	switch (csd_struct) {
	case 0:
		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);
		break;
	case 1:
		/*
		 * This is a block-addressed SDHC card. Most
		 * interesting fields are unused and have fixed
		 * values. To avoid getting tripped by buggy cards,
		 * we assume those fixed values ourselves.
		 */
		mmc_card_set_blockaddr(card);

		csd->tacc_ns	 = 0; /* Unused */
		csd->tacc_clks	 = 0; /* Unused */

		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);

		m = UNSTUFF_BITS(resp, 48, 22);
		csd->capacity     = (1 + m) << 10;

		csd->read_blkbits = 9;
		csd->read_partial = 0;
		csd->write_misalign = 0;
		csd->read_misalign = 0;
		csd->r2w_factor = 4; /* Unused */
		csd->write_blkbits = 9;
		csd->write_partial = 0;
		break;
	default:
		printk("%s: unrecognised CSD structure version %d\n",
			mmc_hostname(card->host), csd_struct);
		mmc_card_set_bad(card);
		return;
	}
}

/*
 * Given a 64-bit response, decode to our card SCR structure.
 */
static void mmc_decode_scr(struct mmc_card *card)
{
	struct sd_scr *scr = &card->scr;
	unsigned int scr_struct;
	u32 resp[4];

	BUG_ON(!mmc_card_sd(card));

	resp[3] = card->raw_scr[1];
	resp[2] = card->raw_scr[0];

	scr_struct = UNSTUFF_BITS(resp, 60, 4);
	if (scr_struct != 0) {
		printk("%s: unrecognised SCR structure version %d\n",
			mmc_hostname(card->host), scr_struct);
		mmc_card_set_bad(card);
		return;
	}

	scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
	scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
}

/*
 * Fetches and decodes switch information
 */
static int mmc_read_switch(struct mmc_card *card)
{
	int err;
	u8 *status;

	err = MMC_ERR_FAILED;

	status = kmalloc(64, GFP_KERNEL);
	if (!status) {
		printk("%s: could not allocate a buffer for switch "
		       "capabilities.\n",
			mmc_hostname(card->host));
		return err;
	}

	err = mmc_sd_switch(card, 0, 0, 1, status);
	if (err != MMC_ERR_NONE) {
		/*
		 * Card not supporting high-speed will ignore the
		 * command.
		 */
		err = MMC_ERR_NONE;
		goto out;
	}

	if (status[13] & 0x02)
		card->sw_caps.hs_max_dtr = 50000000;

out:
	kfree(status);

	return err;
}

/*
 * Test if the card supports high-speed mode and, if so, switch to it.
 */
static int mmc_switch_hs(struct mmc_card *card)
{
	int err;
	u8 *status;

	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
		return MMC_ERR_NONE;

	if (card->sw_caps.hs_max_dtr == 0)
		return MMC_ERR_NONE;

	err = MMC_ERR_FAILED;

	status = kmalloc(64, GFP_KERNEL);
	if (!status) {
		printk("%s: could not allocate a buffer for switch "
		       "capabilities.\n",
			mmc_hostname(card->host));
		return err;
	}

	err = mmc_sd_switch(card, 1, 0, 1, status);
	if (err != MMC_ERR_NONE)
		goto out;

	if ((status[16] & 0xF) != 1) {
		printk(KERN_WARNING "%s: Problem switching card "
			"into high-speed mode!\n",
			mmc_hostname(card->host));
	} else {
		mmc_card_set_highspeed(card);
		mmc_set_timing(card->host, MMC_TIMING_SD_HS);
	}

out:
	kfree(status);

	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);

	/*
	 * If SD_SEND_IF_COND indicates an SD 2.0
	 * compliant card and we should set bit 30
	 * of the ocr to indicate that we can handle
	 * block-addressed SDHC cards.
	 */
	err = mmc_send_if_cond(host, ocr);
	if (err == MMC_ERR_NONE)
		ocr |= 1 << 30;

	err = mmc_send_app_op_cond(host, ocr, 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_SD;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}

	/*
	 * Set card RCA.
	 */
	err = mmc_send_relative_addr(host, &card->rca);
	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 SCR from card.
		 */
		err = mmc_app_send_scr(card, card->raw_scr);
		if (err != MMC_ERR_NONE)
			goto free_card;

		mmc_decode_scr(card);

		/*
		 * Fetch switch information from card.
		 */
		err = mmc_read_switch(card);
		if (err != MMC_ERR_NONE)
			goto free_card;
	}

	/*
	 * Attempt to change to high-speed (if supported)
	 */
	err = mmc_switch_hs(card);
	if (err != MMC_ERR_NONE)
		goto free_card;

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

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

	mmc_set_clock(host, max_dtr);

	/*
	 * Switch to wider bus (if supported).
	 */
	if ((host->caps && MMC_CAP_4_BIT_DATA) &&
		(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
		err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
		if (err != MMC_ERR_NONE)
			goto free_card;

		mmc_set_bus_width(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_sd_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_sd_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_sd_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_sd_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_sd_suspend NULL
#define mmc_sd_resume NULL

#endif

static const struct mmc_bus_ops mmc_sd_ops = {
	.remove = mmc_sd_remove,
	.detect = mmc_sd_detect,
	.suspend = mmc_sd_suspend,
	.resume = mmc_sd_resume,
};

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

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

	mmc_attach_bus(host, &mmc_sd_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;
	}

	if (ocr & MMC_VDD_165_195) {
		printk(KERN_WARNING "%s: SD card claims to support the "
		       "incompletely defined 'low voltage range'. This "
		       "will be ignored.\n", mmc_hostname(host));
		ocr &= ~MMC_VDD_165_195;
	}

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

	/*
	 * Can we support the voltage(s) of the card(s)?
	 */
	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/sd.c
	3	*
	4	* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
	5	* SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
	6	* Copyright (C) 2005-2007 Pierre Ossman, 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	#include "sd_ops.h"
	23
	24	#include "core.h"
	25
	26	static const unsigned int tran_exp[] = {
	27	10000, 100000, 1000000, 10000000,
	28	0, 0, 0, 0
	29	};
	30
	31	static const unsigned char tran_mant[] = {
	32	0, 10, 12, 13, 15, 20, 25, 30,
	33	35, 40, 45, 50, 55, 60, 70, 80,
	34	};
	35
	36	static const unsigned int tacc_exp[] = {
	37	1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
	38	};
	39
	40	static const unsigned int tacc_mant[] = {
	41	0, 10, 12, 13, 15, 20, 25, 30,
	42	35, 40, 45, 50, 55, 60, 70, 80,
	43	};
	44
	45	#define UNSTUFF_BITS(resp,start,size) \
	46	({ \
	47	const int __size = size; \
	48	const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
	49	const int __off = 3 - ((start) / 32); \
	50	const int __shft = (start) & 31; \
	51	u32 __res; \
	52	\
	53	__res = resp[__off] >> __shft; \
	54	if (__size + __shft > 32) \
	55	__res \|= resp[__off-1] << ((32 - __shft) % 32); \
	56	__res & __mask; \
	57	})
	58
	59	/*
	60	* Given the decoded CSD structure, decode the raw CID to our CID structure.
	61	*/
	62	static void mmc_decode_cid(struct mmc_card *card)
	63	{
	64	u32 *resp = card->raw_cid;
65
66	memset(&card->cid, 0, sizeof(struct mmc_cid));
67
68	/*
69	* SD doesn't currently have a version field so we will
70	* have to assume we can parse this.
71	*/
72	card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
73	card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
74	card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
75	card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
76	card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
77	card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
78	card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
79	card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
80	card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
81	card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
82	card->cid.year = UNSTUFF_BITS(resp, 12, 8);
83	card->cid.month = UNSTUFF_BITS(resp, 8, 4);
84
85	card->cid.year += 2000; /* SD cards year offset */
86	}
87
88	/*
89	* Given a 128-bit response, decode to our card CSD structure.
90	*/
91	static void mmc_decode_csd(struct mmc_card *card)
92	{
93	struct mmc_csd *csd = &card->csd;
94	unsigned int e, m, csd_struct;
95	u32 *resp = card->raw_csd;
96
97	csd_struct = UNSTUFF_BITS(resp, 126, 2);
98
99	switch (csd_struct) {
100	case 0:
101	m = UNSTUFF_BITS(resp, 115, 4);
102	e = UNSTUFF_BITS(resp, 112, 3);
103	csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
104	csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
105
106	m = UNSTUFF_BITS(resp, 99, 4);
107	e = UNSTUFF_BITS(resp, 96, 3);
108	csd->max_dtr = tran_exp[e] * tran_mant[m];
109	csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
110
111	e = UNSTUFF_BITS(resp, 47, 3);
112	m = UNSTUFF_BITS(resp, 62, 12);
113	csd->capacity = (1 + m) << (e + 2);
114
115	csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
116	csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
117	csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
118	csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
119	csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
120	csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
121	csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
122	break;
123	case 1:
124	/*
125	* This is a block-addressed SDHC card. Most
126	* interesting fields are unused and have fixed
127	* values. To avoid getting tripped by buggy cards,
128	* we assume those fixed values ourselves.
129	*/
130	mmc_card_set_blockaddr(card);
131
132	csd->tacc_ns = 0; /* Unused */
133	csd->tacc_clks = 0; /* Unused */
134
135	m = UNSTUFF_BITS(resp, 99, 4);
136	e = UNSTUFF_BITS(resp, 96, 3);
137	csd->max_dtr = tran_exp[e] * tran_mant[m];
138	csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
139
140	m = UNSTUFF_BITS(resp, 48, 22);
141	csd->capacity = (1 + m) << 10;
142
143	csd->read_blkbits = 9;
144	csd->read_partial = 0;
145	csd->write_misalign = 0;
146	csd->read_misalign = 0;
147	csd->r2w_factor = 4; /* Unused */
148	csd->write_blkbits = 9;
149	csd->write_partial = 0;
150	break;
151	default:
152	printk("%s: unrecognised CSD structure version %d\n",
153	mmc_hostname(card->host), csd_struct);
154	mmc_card_set_bad(card);
155	return;
156	}
157	}
158
159	/*
160	* Given a 64-bit response, decode to our card SCR structure.
161	*/
162	static void mmc_decode_scr(struct mmc_card *card)
163	{
164	struct sd_scr *scr = &card->scr;
165	unsigned int scr_struct;
166	u32 resp[4];
167
168	BUG_ON(!mmc_card_sd(card));
169
170	resp[3] = card->raw_scr[1];
171	resp[2] = card->raw_scr[0];
172
173	scr_struct = UNSTUFF_BITS(resp, 60, 4);
174	if (scr_struct != 0) {
175	printk("%s: unrecognised SCR structure version %d\n",
176	mmc_hostname(card->host), scr_struct);
177	mmc_card_set_bad(card);
178	return;
179	}
180
181	scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
182	scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
183	}
184
185	/*
1addfcdb	186	* Fetches and decodes switch information
7ea239d9	187	*/
1addfcdb	188	static int mmc_read_switch(struct mmc_card *card)
7ea239d9 PO	189	{
	190	int err;
	191	u8 *status;
	192
7ea239d9 PO	193	err = MMC_ERR_FAILED;
	194
	195	status = kmalloc(64, GFP_KERNEL);
	196	if (!status) {
	197	printk("%s: could not allocate a buffer for switch "
	198	"capabilities.\n",
	199	mmc_hostname(card->host));
	200	return err;
	201	}
	202
	203	err = mmc_sd_switch(card, 0, 0, 1, status);
	204	if (err != MMC_ERR_NONE) {
	205	/*
	206	* Card not supporting high-speed will ignore the
	207	* command.
	208	*/
1addfcdb	209	err = MMC_ERR_NONE;
7ea239d9 PO	210	goto out;
	211	}
	212
	213	if (status[13] & 0x02)
	214	card->sw_caps.hs_max_dtr = 50000000;
	215
1addfcdb PO	216	out:
	217	kfree(status);
	218
	219	return err;
	220	}
	221
	222	/*
	223	* Test if the card supports high-speed mode and, if so, switch to it.
	224	*/
	225	static int mmc_switch_hs(struct mmc_card *card)
	226	{
	227	int err;
	228	u8 *status;
	229
	230	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
	231	return MMC_ERR_NONE;
	232
	233	if (card->sw_caps.hs_max_dtr == 0)
	234	return MMC_ERR_NONE;
	235
	236	err = MMC_ERR_FAILED;
	237
	238	status = kmalloc(64, GFP_KERNEL);
	239	if (!status) {
	240	printk("%s: could not allocate a buffer for switch "
	241	"capabilities.\n",
	242	mmc_hostname(card->host));
	243	return err;
	244	}
	245
7ea239d9 PO	246	err = mmc_sd_switch(card, 1, 0, 1, status);
	247	if (err != MMC_ERR_NONE)
	248	goto out;
	249
	250	if ((status[16] & 0xF) != 1) {
	251	printk(KERN_WARNING "%s: Problem switching card "
	252	"into high-speed mode!\n",
	253	mmc_hostname(card->host));
	254	} else {
	255	mmc_card_set_highspeed(card);
	256	mmc_set_timing(card->host, MMC_TIMING_SD_HS);
	257	}
	258
	259	out:
	260	kfree(status);
	261
	262	return err;
	263	}
	264
	265	/*
6abaa0c9 PO	266	* Handle the detection and initialisation of a card.
	267	*
	268	* In the case of a resume, "curcard" will contain the card
	269	* we're trying to reinitialise.
7ea239d9	270	*/
6abaa0c9 PO	271	static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9 PO	272	struct mmc_card *oldcard)
7ea239d9 PO	273	{
	274	struct mmc_card *card;
	275	int err;
	276	u32 cid[4];
	277	unsigned int max_dtr;
	278
	279	BUG_ON(!host);
	280	BUG_ON(!host->claimed);
	281
7ea239d9 PO	282	/*
	283	* Since we're changing the OCR value, we seem to
	284	* need to tell some cards to go back to the idle
	285	* state. We wait 1ms to give cards time to
	286	* respond.
	287	*/
	288	mmc_go_idle(host);
	289
	290	/*
	291	* If SD_SEND_IF_COND indicates an SD 2.0
	292	* compliant card and we should set bit 30
	293	* of the ocr to indicate that we can handle
	294	* block-addressed SDHC cards.
	295	*/
6abaa0c9	296	err = mmc_send_if_cond(host, ocr);
7ea239d9	297	if (err == MMC_ERR_NONE)
6abaa0c9	298	ocr \|= 1 << 30;
7ea239d9	299
6abaa0c9 PO	300	err = mmc_send_app_op_cond(host, ocr, NULL);
	301	if (err != MMC_ERR_NONE)
	302	goto err;
7ea239d9 PO	303
	304	/*
	305	* Fetch CID from card.
	306	*/
	307	err = mmc_all_send_cid(host, cid);
	308	if (err != MMC_ERR_NONE)
	309	goto err;
	310
6abaa0c9 PO	311	if (oldcard) {
	312	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
	313	goto err;
7ea239d9	314
6abaa0c9 PO	315	card = oldcard;
	316	} else {
	317	/*
	318	* Allocate card structure.
	319	*/
	320	card = mmc_alloc_card(host);
	321	if (IS_ERR(card))
	322	goto err;
	323
	324	card->type = MMC_TYPE_SD;
	325	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	326	}
7ea239d9 PO	327
	328	/*
	329	* Set card RCA.
	330	*/
	331	err = mmc_send_relative_addr(host, &card->rca);
	332	if (err != MMC_ERR_NONE)
	333	goto free_card;
	334
	335	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	336
6abaa0c9 PO	337	if (!oldcard) {
	338	/*
	339	* Fetch CSD from card.
	340	*/
	341	err = mmc_send_csd(card, card->raw_csd);
	342	if (err != MMC_ERR_NONE)
	343	goto free_card;
7ea239d9	344
6abaa0c9 PO	345	mmc_decode_csd(card);
	346	mmc_decode_cid(card);
	347	}
7ea239d9 PO	348
7ea239d9 PO	349	/*
6abaa0c9	350	* Select card, as all following commands rely on that.
7ea239d9 PO	351	*/
	352	err = mmc_select_card(card);
	353	if (err != MMC_ERR_NONE)
	354	goto free_card;
	355
6abaa0c9 PO	356	if (!oldcard) {
	357	/*
	358	* Fetch SCR from card.
	359	*/
	360	err = mmc_app_send_scr(card, card->raw_scr);
	361	if (err != MMC_ERR_NONE)
	362	goto free_card;
7ea239d9	363
6abaa0c9	364	mmc_decode_scr(card);
7ea239d9	365
6abaa0c9 PO	366	/*
	367	* Fetch switch information from card.
	368	*/
	369	err = mmc_read_switch(card);
	370	if (err != MMC_ERR_NONE)
	371	goto free_card;
	372	}
1addfcdb PO	373
	374	/*
	375	* Attempt to change to high-speed (if supported)
7ea239d9 PO	376	*/
	377	err = mmc_switch_hs(card);
	378	if (err != MMC_ERR_NONE)
	379	goto free_card;
	380
	381	/*
	382	* Compute bus speed.
	383	*/
	384	max_dtr = (unsigned int)-1;
	385
	386	if (mmc_card_highspeed(card)) {
	387	if (max_dtr > card->sw_caps.hs_max_dtr)
	388	max_dtr = card->sw_caps.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
	395	/*
	396	* Switch to wider bus (if supported).
	397	*/
	398	if ((host->caps && MMC_CAP_4_BIT_DATA) &&
	399	(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
	400	err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
	401	if (err != MMC_ERR_NONE)
	402	goto free_card;
	403
	404	mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
	405	}
	406
6abaa0c9 PO	407	if (!oldcard)
	408	host->card = card;
	409
	410	return MMC_ERR_NONE;
	411
	412	free_card:
	413	if (!oldcard)
	414	mmc_remove_card(card);
	415	err:
	416
	417	return MMC_ERR_FAILED;
	418	}
	419
	420	/*
	421	* Host is being removed. Free up the current card.
	422	*/
	423	static void mmc_sd_remove(struct mmc_host *host)
	424	{
	425	BUG_ON(!host);
	426	BUG_ON(!host->card);
	427
	428	mmc_remove_card(host->card);
	429	host->card = NULL;
	430	}
	431
	432	/*
	433	* Card detection callback from host.
	434	*/
	435	static void mmc_sd_detect(struct mmc_host *host)
	436	{
	437	int err;
	438
	439	BUG_ON(!host);
	440	BUG_ON(!host->card);
	441
	442	mmc_claim_host(host);
	443
	444	/*
	445	* Just check if our card has been removed.
	446	*/
	447	err = mmc_send_status(host->card, NULL);
7ea239d9 PO	448
	449	mmc_release_host(host);
	450
6abaa0c9 PO	451	if (err != MMC_ERR_NONE) {
	452	mmc_remove_card(host->card);
	453	host->card = NULL;
	454
	455	mmc_claim_host(host);
	456	mmc_detach_bus(host);
	457	mmc_release_host(host);
	458	}
	459	}
	460
	461	#ifdef CONFIG_MMC_UNSAFE_RESUME
	462
	463	/*
	464	* Suspend callback from host.
	465	*/
	466	static void mmc_sd_suspend(struct mmc_host *host)
	467	{
	468	BUG_ON(!host);
	469	BUG_ON(!host->card);
	470
	471	mmc_claim_host(host);
	472	mmc_deselect_cards(host);
	473	host->card->state &= ~MMC_STATE_HIGHSPEED;
	474	mmc_release_host(host);
	475	}
	476
	477	/*
	478	* Resume callback from host.
	479	*
	480	* This function tries to determine if the same card is still present
	481	* and, if so, restore all state to it.
	482	*/
	483	static void mmc_sd_resume(struct mmc_host *host)
	484	{
	485	int err;
	486
	487	BUG_ON(!host);
	488	BUG_ON(!host->card);
	489
	490	mmc_claim_host(host);
	491
	492	err = mmc_sd_init_card(host, host->ocr, host->card);
	493	if (err != MMC_ERR_NONE) {
	494	mmc_remove_card(host->card);
	495	host->card = NULL;
	496
	497	mmc_detach_bus(host);
	498	}
	499
	500	mmc_release_host(host);
	501	}
	502
	503	#else
	504
	505	#define mmc_sd_suspend NULL
	506	#define mmc_sd_resume NULL
	507
	508	#endif
	509
	510	static const struct mmc_bus_ops mmc_sd_ops = {
	511	.remove = mmc_sd_remove,
	512	.detect = mmc_sd_detect,
	513	.suspend = mmc_sd_suspend,
	514	.resume = mmc_sd_resume,
515	};
516
517	/*
518	* Starting point for SD card init.
519	*/
520	int mmc_attach_sd(struct mmc_host *host, u32 ocr)
521	{
522	int err;
523
524	BUG_ON(!host);
525	BUG_ON(!host->claimed);
526
527	mmc_attach_bus(host, &mmc_sd_ops);
528
529	/*
530	* Sanity check the voltages that the card claims to
531	* support.
532	*/
533	if (ocr & 0x7F) {
534	printk(KERN_WARNING "%s: card claims to support voltages "
535	"below the defined range. These will be ignored.\n",
536	mmc_hostname(host));
537	ocr &= ~0x7F;
538	}
539
540	if (ocr & MMC_VDD_165_195) {
541	printk(KERN_WARNING "%s: SD card claims to support the "
542	"incompletely defined 'low voltage range'. This "
543	"will be ignored.\n", mmc_hostname(host));
544	ocr &= ~MMC_VDD_165_195;
545	}
546
547	host->ocr = mmc_select_voltage(host, ocr);
548
549	/*
550	* Can we support the voltage(s) of the card(s)?
551	*/
552	if (!host->ocr)
553	goto err;
554
555	/*
556	* Detect and init the card.
557	*/
558	err = mmc_sd_init_card(host, host->ocr, NULL);
559	if (err != MMC_ERR_NONE)
560	goto err;
561
562	mmc_release_host(host);
563
564	err = mmc_register_card(host->card);
7ea239d9 PO	565	if (err)
	566	goto reclaim_host;
	567
	568	return 0;
	569
	570	reclaim_host:
	571	mmc_claim_host(host);
6abaa0c9	572	mmc_remove_card(host->card);
7ea239d9 PO	573	host->card = NULL;
	574	err:
	575	mmc_detach_bus(host);
	576	mmc_release_host(host);
	577
	578	return 0;
	579	}
	580