[net-next-2.6.git] / drivers / mmc / core / sd.c

/*
 *  linux/drivers/mmc/core/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 <linux/mmc/sd.h>

#include "core.h"
#include "bus.h"
#include "mmc_ops.h"
#include "sd_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;

	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 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;

	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(KERN_ERR "%s: unrecognised CSD structure version %d\n",
			mmc_hostname(card->host), csd_struct);
		return -EINVAL;
	}

	return 0;
}

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

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

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

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

	return 0;
}

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

	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
		return 0;

	if (!(card->csd.cmdclass & CCC_SWITCH)) {
		printk(KERN_WARNING "%s: card lacks mandatory switch "
			"function, performance might suffer.\n",
			mmc_hostname(card->host));
		return 0;
	}

	err = -EIO;

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

	err = mmc_sd_switch(card, 0, 0, 1, status);
	if (err) {
		/* If the host or the card can't do the switch,
		 * fail more gracefully. */
		if ((err != -EINVAL)
		 && (err != -ENOSYS)
		 && (err != -EFAULT))
			goto out;

		printk(KERN_WARNING "%s: problem reading switch "
			"capabilities, performance might suffer.\n",
			mmc_hostname(card->host));
		err = 0;

		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->scr.sda_vsn < SCR_SPEC_VER_1)
		return 0;

	if (!(card->csd.cmdclass & CCC_SWITCH))
		return 0;

	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
		return 0;

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

	err = -EIO;

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

	err = mmc_sd_switch(card, 1, 0, 1, status);
	if (err)
		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;
}

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


static struct attribute *sd_std_attrs[] = {
	&dev_attr_cid.attr,
	&dev_attr_csd.attr,
	&dev_attr_scr.attr,
	&dev_attr_date.attr,
	&dev_attr_fwrev.attr,
	&dev_attr_hwrev.attr,
	&dev_attr_manfid.attr,
	&dev_attr_name.attr,
	&dev_attr_oemid.attr,
	&dev_attr_serial.attr,
	NULL,
};

static struct attribute_group sd_std_attr_group = {
	.attrs = sd_std_attrs,
};

static const struct attribute_group *sd_attr_groups[] = {
	&sd_std_attr_group,
	NULL,
};

static struct device_type sd_type = {
	.groups = sd_attr_groups,
};

/*
 * Handle the detection and initialisation of a card.
 *
 * In the case of a resume, "oldcard" 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);
	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);

	/*
	 * 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)
		ocr |= 1 << 30;

	err = mmc_send_app_op_cond(host, ocr, NULL);
	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, &sd_type);
		if (IS_ERR(card)) {
			err = PTR_ERR(card);
			goto err;
		}

		card->type = MMC_TYPE_SD;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}

	/*
	 * For native busses:  get card RCA and quit open drain mode.
	 */
	if (!mmc_host_is_spi(host)) {
		err = mmc_send_relative_addr(host, &card->rca);
		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;

		mmc_decode_cid(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 SCR from card.
		 */
		err = mmc_app_send_scr(card, card->raw_scr);
		if (err)
			goto free_card;

		err = mmc_decode_scr(card);
		if (err < 0)
			goto free_card;

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

	/*
	 * For SPI, enable CRC as appropriate.
	 * This CRC enable is located AFTER the reading of the
	 * card registers because some SDHC cards are not able
	 * to provide valid CRCs for non-512-byte blocks.
	 */
	if (mmc_host_is_spi(host)) {
		err = mmc_spi_set_crc(host, use_spi_crc);
		if (err)
			goto free_card;
	}

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

		mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
	}

	/*
	 * Check if read-only switch is active.
	 */
	if (!oldcard) {
		if (!host->ops->get_ro || host->ops->get_ro(host) < 0) {
			printk(KERN_WARNING "%s: host does not "
				"support reading read-only "
				"switch. assuming write-enable.\n",
				mmc_hostname(host));
		} else {
			if (host->ops->get_ro(host) > 0)
				mmc_card_set_readonly(card);
		}
	}

	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_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_sd_remove(host);

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

/*
 * Suspend callback from host.
 */
static int mmc_sd_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);

	return 0;
}

/*
 * 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 int 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);
	mmc_release_host(host);

	return err;
}

static void mmc_sd_power_restore(struct mmc_host *host)
{
	host->card->state &= ~MMC_STATE_HIGHSPEED;
	mmc_claim_host(host);
	mmc_sd_init_card(host, host->ocr, host->card);
	mmc_release_host(host);
}

static const struct mmc_bus_ops mmc_sd_ops = {
	.remove = mmc_sd_remove,
	.detect = mmc_sd_detect,
	.suspend = NULL,
	.resume = NULL,
	.power_restore = mmc_sd_power_restore,
};

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

static void mmc_sd_attach_bus_ops(struct mmc_host *host)
{
	const struct mmc_bus_ops *bus_ops;

	if (host->caps & MMC_CAP_NONREMOVABLE || !mmc_assume_removable)
		bus_ops = &mmc_sd_ops_unsafe;
	else
		bus_ops = &mmc_sd_ops;
	mmc_attach_bus(host, bus_ops);
}

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

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

	mmc_sd_attach_bus_ops(host);

	/*
	 * We need to get OCR a different way for SPI.
	 */
	if (mmc_host_is_spi(host)) {
		mmc_go_idle(host);

		err = mmc_spi_read_ocr(host, 0, &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;
	}

	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) {
		err = -EINVAL;
		goto err;
	}

	/*
	 * Detect and init the card.
	 */
	err = mmc_sd_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 SD card\n",
		mmc_hostname(host), err);

	return err;
}
Commit	Line	Data
7ea239d9	1	/*
70f10482	2	* linux/drivers/mmc/core/sd.c
7ea239d9 PO	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>
3373c0ae	18	#include <linux/mmc/sd.h>
7ea239d9 PO	19
7ea239d9 PO	20	#include "core.h"
4101c16a	21	#include "bus.h"
7ea239d9 PO	22	#include "mmc_ops.h"
	23	#include "sd_ops.h"
	24
7ea239d9 PO	25	static const unsigned int tran_exp[] = {
	26	10000, 100000, 1000000, 10000000,
	27	0, 0, 0, 0
	28	};
	29
	30	static const unsigned char tran_mant[] = {
	31	0, 10, 12, 13, 15, 20, 25, 30,
	32	35, 40, 45, 50, 55, 60, 70, 80,
	33	};
	34
	35	static const unsigned int tacc_exp[] = {
	36	1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
	37	};
	38
	39	static const unsigned int tacc_mant[] = {
	40	0, 10, 12, 13, 15, 20, 25, 30,
	41	35, 40, 45, 50, 55, 60, 70, 80,
	42	};
	43
	44	#define UNSTUFF_BITS(resp,start,size) \
	45	({ \
	46	const int __size = size; \
	47	const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
	48	const int __off = 3 - ((start) / 32); \
	49	const int __shft = (start) & 31; \
	50	u32 __res; \
	51	\
	52	__res = resp[__off] >> __shft; \
	53	if (__size + __shft > 32) \
	54	__res \|= resp[__off-1] << ((32 - __shft) % 32); \
	55	__res & __mask; \
	56	})
	57
	58	/*
	59	* Given the decoded CSD structure, decode the raw CID to our CID structure.
	60	*/
	61	static void mmc_decode_cid(struct mmc_card *card)
	62	{
	63	u32 *resp = card->raw_cid;
	64
	65	memset(&card->cid, 0, sizeof(struct mmc_cid));
	66
	67	/*
	68	* SD doesn't currently have a version field so we will
	69	* have to assume we can parse this.
	70	*/
	71	card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
	72	card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
	73	card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
	74	card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
	75	card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
	76	card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
	77	card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
	78	card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
	79	card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
	80	card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
	81	card->cid.year = UNSTUFF_BITS(resp, 12, 8);
	82	card->cid.month = UNSTUFF_BITS(resp, 8, 4);
	83
	84	card->cid.year += 2000; /* SD cards year offset */
	85	}
	86
	87	/*
	88	* Given a 128-bit response, decode to our card CSD structure.
89	*/
bd766312	90	static int mmc_decode_csd(struct mmc_card *card)
7ea239d9 PO	91	{
	92	struct mmc_csd *csd = &card->csd;
	93	unsigned int e, m, csd_struct;
	94	u32 *resp = card->raw_csd;
	95
	96	csd_struct = UNSTUFF_BITS(resp, 126, 2);
	97
	98	switch (csd_struct) {
	99	case 0:
	100	m = UNSTUFF_BITS(resp, 115, 4);
	101	e = UNSTUFF_BITS(resp, 112, 3);
	102	csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
	103	csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
	104
	105	m = UNSTUFF_BITS(resp, 99, 4);
	106	e = UNSTUFF_BITS(resp, 96, 3);
	107	csd->max_dtr = tran_exp[e] * tran_mant[m];
	108	csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
	109
	110	e = UNSTUFF_BITS(resp, 47, 3);
	111	m = UNSTUFF_BITS(resp, 62, 12);
	112	csd->capacity = (1 + m) << (e + 2);
	113
	114	csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
	115	csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
	116	csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
	117	csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
	118	csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
	119	csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
	120	csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
	121	break;
	122	case 1:
	123	/*
	124	* This is a block-addressed SDHC card. Most
	125	* interesting fields are unused and have fixed
	126	* values. To avoid getting tripped by buggy cards,
	127	* we assume those fixed values ourselves.
	128	*/
	129	mmc_card_set_blockaddr(card);
	130
	131	csd->tacc_ns = 0; /* Unused */
	132	csd->tacc_clks = 0; /* Unused */
	133
	134	m = UNSTUFF_BITS(resp, 99, 4);
	135	e = UNSTUFF_BITS(resp, 96, 3);
	136	csd->max_dtr = tran_exp[e] * tran_mant[m];
	137	csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
	138
	139	m = UNSTUFF_BITS(resp, 48, 22);
	140	csd->capacity = (1 + m) << 10;
	141
	142	csd->read_blkbits = 9;
	143	csd->read_partial = 0;
	144	csd->write_misalign = 0;
	145	csd->read_misalign = 0;
	146	csd->r2w_factor = 4; /* Unused */
	147	csd->write_blkbits = 9;
	148	csd->write_partial = 0;
	149	break;
	150	default:
facba917	151	printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
7ea239d9	152	mmc_hostname(card->host), csd_struct);
bd766312	153	return -EINVAL;
7ea239d9	154	}
bd766312 PO	155
bd766312 PO	156	return 0;
7ea239d9 PO	157	}
	158
	159	/*
	160	* Given a 64-bit response, decode to our card SCR structure.
	161	*/
bd766312	162	static int mmc_decode_scr(struct mmc_card *card)
7ea239d9 PO	163	{
	164	struct sd_scr *scr = &card->scr;
	165	unsigned int scr_struct;
	166	u32 resp[4];
	167
7ea239d9 PO	168	resp[3] = card->raw_scr[1];
	169	resp[2] = card->raw_scr[0];
	170
	171	scr_struct = UNSTUFF_BITS(resp, 60, 4);
	172	if (scr_struct != 0) {
facba917	173	printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
7ea239d9	174	mmc_hostname(card->host), scr_struct);
bd766312	175	return -EINVAL;
7ea239d9 PO	176	}
	177
	178	scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
	179	scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
bd766312 PO	180
bd766312 PO	181	return 0;
7ea239d9 PO	182	}
	183
	184	/*
1addfcdb	185	* Fetches and decodes switch information
7ea239d9	186	*/
1addfcdb	187	static int mmc_read_switch(struct mmc_card *card)
7ea239d9 PO	188	{
	189	int err;
	190	u8 *status;
	191
3373c0ae	192	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
17b0429d	193	return 0;
3373c0ae PO	194
	195	if (!(card->csd.cmdclass & CCC_SWITCH)) {
	196	printk(KERN_WARNING "%s: card lacks mandatory switch "
	197	"function, performance might suffer.\n",
	198	mmc_hostname(card->host));
17b0429d	199	return 0;
3373c0ae PO	200	}
3373c0ae PO	201
17b0429d	202	err = -EIO;
7ea239d9 PO	203
	204	status = kmalloc(64, GFP_KERNEL);
	205	if (!status) {
facba917 PO	206	printk(KERN_ERR "%s: could not allocate a buffer for "
facba917 PO	207	"switch capabilities.\n", mmc_hostname(card->host));
17b0429d	208	return -ENOMEM;
7ea239d9 PO	209	}
	210
	211	err = mmc_sd_switch(card, 0, 0, 1, status);
17b0429d	212	if (err) {
d08ebedd WM	213	/* If the host or the card can't do the switch,
	214	* fail more gracefully. */
	215	if ((err != -EINVAL)
	216	&& (err != -ENOSYS)
	217	&& (err != -EFAULT))
adf66a0d PO	218	goto out;
adf66a0d PO	219
3373c0ae PO	220	printk(KERN_WARNING "%s: problem reading switch "
	221	"capabilities, performance might suffer.\n",
	222	mmc_hostname(card->host));
17b0429d	223	err = 0;
adf66a0d	224
7ea239d9 PO	225	goto out;
	226	}
	227
	228	if (status[13] & 0x02)
	229	card->sw_caps.hs_max_dtr = 50000000;
	230
1addfcdb PO	231	out:
	232	kfree(status);
	233
	234	return err;
	235	}
	236
	237	/*
	238	* Test if the card supports high-speed mode and, if so, switch to it.
	239	*/
	240	static int mmc_switch_hs(struct mmc_card *card)
	241	{
	242	int err;
	243	u8 *status;
	244
3373c0ae	245	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
17b0429d	246	return 0;
3373c0ae PO	247
3373c0ae PO	248	if (!(card->csd.cmdclass & CCC_SWITCH))
17b0429d	249	return 0;
3373c0ae	250
1addfcdb	251	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
17b0429d	252	return 0;
1addfcdb PO	253
1addfcdb PO	254	if (card->sw_caps.hs_max_dtr == 0)
17b0429d	255	return 0;
1addfcdb	256
17b0429d	257	err = -EIO;
1addfcdb PO	258
	259	status = kmalloc(64, GFP_KERNEL);
	260	if (!status) {
facba917 PO	261	printk(KERN_ERR "%s: could not allocate a buffer for "
facba917 PO	262	"switch capabilities.\n", mmc_hostname(card->host));
17b0429d	263	return -ENOMEM;
1addfcdb PO	264	}
1addfcdb PO	265
7ea239d9	266	err = mmc_sd_switch(card, 1, 0, 1, status);
17b0429d	267	if (err)
7ea239d9 PO	268	goto out;
	269
	270	if ((status[16] & 0xF) != 1) {
	271	printk(KERN_WARNING "%s: Problem switching card "
	272	"into high-speed mode!\n",
	273	mmc_hostname(card->host));
	274	} else {
	275	mmc_card_set_highspeed(card);
	276	mmc_set_timing(card->host, MMC_TIMING_SD_HS);
	277	}
	278
	279	out:
	280	kfree(status);
	281
	282	return err;
	283	}
	284
51ec92e2 PO	285	MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	286	card->raw_cid[2], card->raw_cid[3]);
	287	MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	288	card->raw_csd[2], card->raw_csd[3]);
	289	MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
	290	MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
	291	MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
	292	MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
	293	MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
	294	MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
	295	MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
	296	MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
	297
	298
	299	static struct attribute *sd_std_attrs[] = {
	300	&dev_attr_cid.attr,
	301	&dev_attr_csd.attr,
	302	&dev_attr_scr.attr,
	303	&dev_attr_date.attr,
	304	&dev_attr_fwrev.attr,
	305	&dev_attr_hwrev.attr,
	306	&dev_attr_manfid.attr,
	307	&dev_attr_name.attr,
	308	&dev_attr_oemid.attr,
	309	&dev_attr_serial.attr,
	310	NULL,
	311	};
	312
	313	static struct attribute_group sd_std_attr_group = {
	314	.attrs = sd_std_attrs,
	315	};
	316
a4dbd674	317	static const struct attribute_group *sd_attr_groups[] = {
51ec92e2 PO	318	&sd_std_attr_group,
	319	NULL,
	320	};
	321
	322	static struct device_type sd_type = {
	323	.groups = sd_attr_groups,
	324	};
	325
7ea239d9	326	/*
6abaa0c9 PO	327	* Handle the detection and initialisation of a card.
6abaa0c9 PO	328	*
8769392b	329	* In the case of a resume, "oldcard" will contain the card
6abaa0c9	330	* we're trying to reinitialise.
7ea239d9	331	*/
6abaa0c9 PO	332	static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9 PO	333	struct mmc_card *oldcard)
7ea239d9 PO	334	{
	335	struct mmc_card *card;
	336	int err;
	337	u32 cid[4];
	338	unsigned int max_dtr;
	339
	340	BUG_ON(!host);
d84075c8	341	WARN_ON(!host->claimed);
7ea239d9	342
7ea239d9 PO	343	/*
	344	* Since we're changing the OCR value, we seem to
	345	* need to tell some cards to go back to the idle
	346	* state. We wait 1ms to give cards time to
	347	* respond.
	348	*/
	349	mmc_go_idle(host);
	350
	351	/*
	352	* If SD_SEND_IF_COND indicates an SD 2.0
	353	* compliant card and we should set bit 30
	354	* of the ocr to indicate that we can handle
	355	* block-addressed SDHC cards.
	356	*/
6abaa0c9	357	err = mmc_send_if_cond(host, ocr);
17b0429d	358	if (!err)
6abaa0c9	359	ocr \|= 1 << 30;
7ea239d9	360
6abaa0c9	361	err = mmc_send_app_op_cond(host, ocr, NULL);
17b0429d	362	if (err)
6abaa0c9	363	goto err;
7ea239d9 PO	364
	365	/*
	366	* Fetch CID from card.
	367	*/
af517150 DB	368	if (mmc_host_is_spi(host))
	369	err = mmc_send_cid(host, cid);
	370	else
	371	err = mmc_all_send_cid(host, cid);
17b0429d	372	if (err)
7ea239d9 PO	373	goto err;
7ea239d9 PO	374
6abaa0c9	375	if (oldcard) {
adf66a0d PO	376	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
adf66a0d PO	377	err = -ENOENT;
6abaa0c9	378	goto err;
adf66a0d	379	}
7ea239d9	380
6abaa0c9 PO	381	card = oldcard;
	382	} else {
	383	/*
	384	* Allocate card structure.
	385	*/
51ec92e2	386	card = mmc_alloc_card(host, &sd_type);
adf66a0d PO	387	if (IS_ERR(card)) {
adf66a0d PO	388	err = PTR_ERR(card);
6abaa0c9	389	goto err;
adf66a0d	390	}
6abaa0c9 PO	391
	392	card->type = MMC_TYPE_SD;
	393	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	394	}
7ea239d9 PO	395
7ea239d9 PO	396	/*
af517150	397	* For native busses: get card RCA and quit open drain mode.
7ea239d9	398	*/
af517150 DB	399	if (!mmc_host_is_spi(host)) {
	400	err = mmc_send_relative_addr(host, &card->rca);
	401	if (err)
	402	goto free_card;
7ea239d9	403
af517150 DB	404	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
af517150 DB	405	}
7ea239d9	406
6abaa0c9 PO	407	if (!oldcard) {
	408	/*
	409	* Fetch CSD from card.
	410	*/
	411	err = mmc_send_csd(card, card->raw_csd);
17b0429d	412	if (err)
6abaa0c9	413	goto free_card;
7ea239d9	414
bd766312	415	err = mmc_decode_csd(card);
adf66a0d	416	if (err)
bd766312 PO	417	goto free_card;
bd766312 PO	418
6abaa0c9 PO	419	mmc_decode_cid(card);
6abaa0c9 PO	420	}
7ea239d9 PO	421
7ea239d9 PO	422	/*
6abaa0c9	423	* Select card, as all following commands rely on that.
7ea239d9	424	*/
af517150 DB	425	if (!mmc_host_is_spi(host)) {
	426	err = mmc_select_card(card);
	427	if (err)
	428	goto free_card;
	429	}
7ea239d9	430
6abaa0c9 PO	431	if (!oldcard) {
	432	/*
	433	* Fetch SCR from card.
	434	*/
	435	err = mmc_app_send_scr(card, card->raw_scr);
17b0429d	436	if (err)
6abaa0c9	437	goto free_card;
7ea239d9	438
bd766312 PO	439	err = mmc_decode_scr(card);
	440	if (err < 0)
	441	goto free_card;
7ea239d9	442
6abaa0c9 PO	443	/*
	444	* Fetch switch information from card.
	445	*/
	446	err = mmc_read_switch(card);
17b0429d	447	if (err)
6abaa0c9 PO	448	goto free_card;
6abaa0c9 PO	449	}
1addfcdb	450
9d9f25c0 WM	451	/*
	452	* For SPI, enable CRC as appropriate.
	453	* This CRC enable is located AFTER the reading of the
	454	* card registers because some SDHC cards are not able
	455	* to provide valid CRCs for non-512-byte blocks.
	456	*/
	457	if (mmc_host_is_spi(host)) {
	458	err = mmc_spi_set_crc(host, use_spi_crc);
	459	if (err)
	460	goto free_card;
	461	}
	462
1addfcdb PO	463	/*
1addfcdb PO	464	* Attempt to change to high-speed (if supported)
7ea239d9 PO	465	*/
7ea239d9 PO	466	err = mmc_switch_hs(card);
17b0429d	467	if (err)
7ea239d9 PO	468	goto free_card;
	469
	470	/*
	471	* Compute bus speed.
	472	*/
	473	max_dtr = (unsigned int)-1;
	474
	475	if (mmc_card_highspeed(card)) {
	476	if (max_dtr > card->sw_caps.hs_max_dtr)
	477	max_dtr = card->sw_caps.hs_max_dtr;
	478	} else if (max_dtr > card->csd.max_dtr) {
	479	max_dtr = card->csd.max_dtr;
	480	}
	481
	482	mmc_set_clock(host, max_dtr);
	483
	484	/*
	485	* Switch to wider bus (if supported).
	486	*/
71651297	487	if ((host->caps & MMC_CAP_4_BIT_DATA) &&
7ea239d9 PO	488	(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
7ea239d9 PO	489	err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
17b0429d	490	if (err)
7ea239d9 PO	491	goto free_card;
	492
	493	mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
	494	}
	495
c3bff2ec PO	496	/*
	497	* Check if read-only switch is active.
	498	*/
	499	if (!oldcard) {
08f80bb5	500	if (!host->ops->get_ro \|\| host->ops->get_ro(host) < 0) {
c3bff2ec PO	501	printk(KERN_WARNING "%s: host does not "
	502	"support reading read-only "
	503	"switch. assuming write-enable.\n",
	504	mmc_hostname(host));
	505	} else {
08f80bb5	506	if (host->ops->get_ro(host) > 0)
c3bff2ec PO	507	mmc_card_set_readonly(card);
	508	}
	509	}
	510
6abaa0c9 PO	511	if (!oldcard)
	512	host->card = card;
	513
17b0429d	514	return 0;
6abaa0c9 PO	515
	516	free_card:
	517	if (!oldcard)
	518	mmc_remove_card(card);
	519	err:
	520
adf66a0d	521	return err;
6abaa0c9 PO	522	}
	523
	524	/*
	525	* Host is being removed. Free up the current card.
	526	*/
	527	static void mmc_sd_remove(struct mmc_host *host)
	528	{
	529	BUG_ON(!host);
	530	BUG_ON(!host->card);
	531
	532	mmc_remove_card(host->card);
	533	host->card = NULL;
	534	}
	535
	536	/*
	537	* Card detection callback from host.
	538	*/
	539	static void mmc_sd_detect(struct mmc_host *host)
	540	{
	541	int err;
	542
	543	BUG_ON(!host);
	544	BUG_ON(!host->card);
	545
	546	mmc_claim_host(host);
	547
	548	/*
	549	* Just check if our card has been removed.
	550	*/
	551	err = mmc_send_status(host->card, NULL);
7ea239d9 PO	552
	553	mmc_release_host(host);
	554
17b0429d	555	if (err) {
4101c16a	556	mmc_sd_remove(host);
6abaa0c9 PO	557
	558	mmc_claim_host(host);
	559	mmc_detach_bus(host);
	560	mmc_release_host(host);
	561	}
	562	}
	563
6abaa0c9 PO	564	/*
	565	* Suspend callback from host.
	566	*/
95cdfb72	567	static int mmc_sd_suspend(struct mmc_host *host)
6abaa0c9 PO	568	{
	569	BUG_ON(!host);
	570	BUG_ON(!host->card);
	571
	572	mmc_claim_host(host);
af517150 DB	573	if (!mmc_host_is_spi(host))
af517150 DB	574	mmc_deselect_cards(host);
6abaa0c9 PO	575	host->card->state &= ~MMC_STATE_HIGHSPEED;
6abaa0c9 PO	576	mmc_release_host(host);
95cdfb72 NP	577
95cdfb72 NP	578	return 0;
6abaa0c9 PO	579	}
	580
	581	/*
	582	* Resume callback from host.
	583	*
	584	* This function tries to determine if the same card is still present
	585	* and, if so, restore all state to it.
	586	*/
95cdfb72	587	static int mmc_sd_resume(struct mmc_host *host)
6abaa0c9 PO	588	{
	589	int err;
	590
	591	BUG_ON(!host);
	592	BUG_ON(!host->card);
	593
	594	mmc_claim_host(host);
6abaa0c9	595	err = mmc_sd_init_card(host, host->ocr, host->card);
2986d0bf PO	596	mmc_release_host(host);
2986d0bf PO	597
95cdfb72	598	return err;
6abaa0c9 PO	599	}
6abaa0c9 PO	600
eae1aeee AH	601	static void mmc_sd_power_restore(struct mmc_host *host)
	602	{
	603	host->card->state &= ~MMC_STATE_HIGHSPEED;
	604	mmc_claim_host(host);
	605	mmc_sd_init_card(host, host->ocr, host->card);
	606	mmc_release_host(host);
	607	}
	608
6abaa0c9	609	static const struct mmc_bus_ops mmc_sd_ops = {
9feae246 AH	610	.remove = mmc_sd_remove,
	611	.detect = mmc_sd_detect,
	612	.suspend = NULL,
	613	.resume = NULL,
eae1aeee	614	.power_restore = mmc_sd_power_restore,
9feae246 AH	615	};
	616
	617	static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
6abaa0c9 PO	618	.remove = mmc_sd_remove,
	619	.detect = mmc_sd_detect,
	620	.suspend = mmc_sd_suspend,
	621	.resume = mmc_sd_resume,
eae1aeee	622	.power_restore = mmc_sd_power_restore,
6abaa0c9 PO	623	};
6abaa0c9 PO	624
9feae246 AH	625	static void mmc_sd_attach_bus_ops(struct mmc_host *host)
	626	{
	627	const struct mmc_bus_ops *bus_ops;
	628
bd68e083	629	if (host->caps & MMC_CAP_NONREMOVABLE \|\| !mmc_assume_removable)
9feae246 AH	630	bus_ops = &mmc_sd_ops_unsafe;
	631	else
	632	bus_ops = &mmc_sd_ops;
	633	mmc_attach_bus(host, bus_ops);
	634	}
	635
6abaa0c9 PO	636	/*
	637	* Starting point for SD card init.
	638	*/
	639	int mmc_attach_sd(struct mmc_host *host, u32 ocr)
	640	{
	641	int err;
	642
	643	BUG_ON(!host);
d84075c8	644	WARN_ON(!host->claimed);
6abaa0c9	645
9feae246	646	mmc_sd_attach_bus_ops(host);
6abaa0c9	647
af517150 DB	648	/*
	649	* We need to get OCR a different way for SPI.
	650	*/
	651	if (mmc_host_is_spi(host)) {
	652	mmc_go_idle(host);
	653
	654	err = mmc_spi_read_ocr(host, 0, &ocr);
	655	if (err)
	656	goto err;
	657	}
	658
6abaa0c9 PO	659	/*
	660	* Sanity check the voltages that the card claims to
	661	* support.
	662	*/
	663	if (ocr & 0x7F) {
	664	printk(KERN_WARNING "%s: card claims to support voltages "
	665	"below the defined range. These will be ignored.\n",
	666	mmc_hostname(host));
	667	ocr &= ~0x7F;
	668	}
	669
	670	if (ocr & MMC_VDD_165_195) {
	671	printk(KERN_WARNING "%s: SD card claims to support the "
	672	"incompletely defined 'low voltage range'. This "
	673	"will be ignored.\n", mmc_hostname(host));
	674	ocr &= ~MMC_VDD_165_195;
	675	}
	676
	677	host->ocr = mmc_select_voltage(host, ocr);
	678
	679	/*
	680	* Can we support the voltage(s) of the card(s)?
	681	*/
109b5bed PO	682	if (!host->ocr) {
109b5bed PO	683	err = -EINVAL;
6abaa0c9	684	goto err;
109b5bed	685	}
6abaa0c9 PO	686
	687	/*
	688	* Detect and init the card.
	689	*/
	690	err = mmc_sd_init_card(host, host->ocr, NULL);
17b0429d	691	if (err)
6abaa0c9 PO	692	goto err;
	693
	694	mmc_release_host(host);
	695
4101c16a	696	err = mmc_add_card(host->card);
7ea239d9	697	if (err)
2986d0bf	698	goto remove_card;
7ea239d9 PO	699
	700	return 0;
	701
2986d0bf	702	remove_card:
6abaa0c9	703	mmc_remove_card(host->card);
7ea239d9	704	host->card = NULL;
2986d0bf	705	mmc_claim_host(host);
7ea239d9 PO	706	err:
	707	mmc_detach_bus(host);
	708	mmc_release_host(host);
	709
109b5bed PO	710	printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
	711	mmc_hostname(host), err);
	712
adf66a0d	713	return err;
7ea239d9 PO	714	}
7ea239d9 PO	715