[deliverable/linux.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 "sysfs.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];

	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(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) {
		/*
		 * We all hosts that cannot perform the command
		 * to fail more gracefully
		 */
		if (err != -EINVAL)
			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;
}

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

	err = mmc_send_app_op_cond(host, ocr, NULL);
	if (err)
		goto err;

	/*
	 * Fetch CID from card.
	 */
	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_SD;
		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	}

	/*
	 * Set card RCA.
	 */
	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.
	 */
	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;
	}

	/*
	 * 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) {
			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))
				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);
	}
}

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(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
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_sd_dev_attrs[] = {
	MMC_ATTR_RO(cid),
	MMC_ATTR_RO(csd),
	MMC_ATTR_RO(scr),
	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_sd_sysfs_add(struct mmc_host *host, struct mmc_card *card)
{
	int ret;

	ret = mmc_add_attrs(card, mmc_sd_dev_attrs);
	if (ret < 0)
		return ret;

	return 0;
}

/*
 * Removes the sysfs entries added by mmc_sysfs_add().
 */
static void mmc_sd_sysfs_remove(struct mmc_host *host, struct mmc_card *card)
{
	mmc_remove_attrs(card, mmc_sd_dev_attrs);
}

#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);
	mmc_release_host(host);

	if (err) {
		mmc_sd_remove(host);

		mmc_claim_host(host);
		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,
	.sysfs_add = mmc_sd_sysfs_add,
	.sysfs_remove = mmc_sd_sysfs_remove,
	.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) {
		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
	20	#include "core.h"
	21	#include "sysfs.h"
4101c16a	22	#include "bus.h"
7ea239d9 PO	23	#include "mmc_ops.h"
	24	#include "sd_ops.h"
	25
7ea239d9 PO	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	*/
bd766312	91	static int mmc_decode_csd(struct mmc_card *card)
7ea239d9 PO	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:
facba917	152	printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
7ea239d9	153	mmc_hostname(card->host), csd_struct);
bd766312	154	return -EINVAL;
7ea239d9	155	}
bd766312 PO	156
bd766312 PO	157	return 0;
7ea239d9 PO	158	}
	159
	160	/*
	161	* Given a 64-bit response, decode to our card SCR structure.
	162	*/
bd766312	163	static int mmc_decode_scr(struct mmc_card *card)
7ea239d9 PO	164	{
	165	struct sd_scr *scr = &card->scr;
	166	unsigned int scr_struct;
	167	u32 resp[4];
	168
	169	BUG_ON(!mmc_card_sd(card));
	170
	171	resp[3] = card->raw_scr[1];
	172	resp[2] = card->raw_scr[0];
	173
	174	scr_struct = UNSTUFF_BITS(resp, 60, 4);
	175	if (scr_struct != 0) {
facba917	176	printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
7ea239d9	177	mmc_hostname(card->host), scr_struct);
bd766312	178	return -EINVAL;
7ea239d9 PO	179	}
	180
	181	scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
	182	scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
bd766312 PO	183
bd766312 PO	184	return 0;
7ea239d9 PO	185	}
	186
	187	/*
1addfcdb	188	* Fetches and decodes switch information
7ea239d9	189	*/
1addfcdb	190	static int mmc_read_switch(struct mmc_card *card)
7ea239d9 PO	191	{
	192	int err;
	193	u8 *status;
	194
3373c0ae	195	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
17b0429d	196	return 0;
3373c0ae PO	197
	198	if (!(card->csd.cmdclass & CCC_SWITCH)) {
	199	printk(KERN_WARNING "%s: card lacks mandatory switch "
	200	"function, performance might suffer.\n",
	201	mmc_hostname(card->host));
17b0429d	202	return 0;
3373c0ae PO	203	}
3373c0ae PO	204
17b0429d	205	err = -EIO;
7ea239d9 PO	206
	207	status = kmalloc(64, GFP_KERNEL);
	208	if (!status) {
facba917 PO	209	printk(KERN_ERR "%s: could not allocate a buffer for "
facba917 PO	210	"switch capabilities.\n", mmc_hostname(card->host));
17b0429d	211	return -ENOMEM;
7ea239d9 PO	212	}
	213
	214	err = mmc_sd_switch(card, 0, 0, 1, status);
17b0429d	215	if (err) {
adf66a0d PO	216	/*
	217	* We all hosts that cannot perform the command
	218	* to fail more gracefully
	219	*/
	220	if (err != -EINVAL)
	221	goto out;
	222
3373c0ae PO	223	printk(KERN_WARNING "%s: problem reading switch "
	224	"capabilities, performance might suffer.\n",
	225	mmc_hostname(card->host));
17b0429d	226	err = 0;
adf66a0d	227
7ea239d9 PO	228	goto out;
	229	}
	230
	231	if (status[13] & 0x02)
	232	card->sw_caps.hs_max_dtr = 50000000;
	233
1addfcdb PO	234	out:
	235	kfree(status);
	236
	237	return err;
	238	}
	239
	240	/*
	241	* Test if the card supports high-speed mode and, if so, switch to it.
	242	*/
	243	static int mmc_switch_hs(struct mmc_card *card)
	244	{
	245	int err;
	246	u8 *status;
	247
3373c0ae	248	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
17b0429d	249	return 0;
3373c0ae PO	250
3373c0ae PO	251	if (!(card->csd.cmdclass & CCC_SWITCH))
17b0429d	252	return 0;
3373c0ae	253
1addfcdb	254	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
17b0429d	255	return 0;
1addfcdb PO	256
1addfcdb PO	257	if (card->sw_caps.hs_max_dtr == 0)
17b0429d	258	return 0;
1addfcdb	259
17b0429d	260	err = -EIO;
1addfcdb PO	261
	262	status = kmalloc(64, GFP_KERNEL);
	263	if (!status) {
facba917 PO	264	printk(KERN_ERR "%s: could not allocate a buffer for "
facba917 PO	265	"switch capabilities.\n", mmc_hostname(card->host));
17b0429d	266	return -ENOMEM;
1addfcdb PO	267	}
1addfcdb PO	268
7ea239d9	269	err = mmc_sd_switch(card, 1, 0, 1, status);
17b0429d	270	if (err)
7ea239d9 PO	271	goto out;
	272
	273	if ((status[16] & 0xF) != 1) {
	274	printk(KERN_WARNING "%s: Problem switching card "
	275	"into high-speed mode!\n",
	276	mmc_hostname(card->host));
	277	} else {
	278	mmc_card_set_highspeed(card);
	279	mmc_set_timing(card->host, MMC_TIMING_SD_HS);
	280	}
	281
	282	out:
	283	kfree(status);
	284
	285	return err;
	286	}
	287
	288	/*
6abaa0c9 PO	289	* Handle the detection and initialisation of a card.
	290	*
	291	* In the case of a resume, "curcard" will contain the card
	292	* we're trying to reinitialise.
7ea239d9	293	*/
6abaa0c9 PO	294	static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9 PO	295	struct mmc_card *oldcard)
7ea239d9 PO	296	{
	297	struct mmc_card *card;
	298	int err;
	299	u32 cid[4];
	300	unsigned int max_dtr;
	301
	302	BUG_ON(!host);
	303	BUG_ON(!host->claimed);
	304
7ea239d9 PO	305	/*
	306	* Since we're changing the OCR value, we seem to
	307	* need to tell some cards to go back to the idle
	308	* state. We wait 1ms to give cards time to
	309	* respond.
	310	*/
	311	mmc_go_idle(host);
	312
	313	/*
	314	* If SD_SEND_IF_COND indicates an SD 2.0
	315	* compliant card and we should set bit 30
	316	* of the ocr to indicate that we can handle
	317	* block-addressed SDHC cards.
	318	*/
6abaa0c9	319	err = mmc_send_if_cond(host, ocr);
17b0429d	320	if (!err)
6abaa0c9	321	ocr \|= 1 << 30;
7ea239d9	322
6abaa0c9	323	err = mmc_send_app_op_cond(host, ocr, NULL);
17b0429d	324	if (err)
6abaa0c9	325	goto err;
7ea239d9 PO	326
	327	/*
	328	* Fetch CID from card.
	329	*/
	330	err = mmc_all_send_cid(host, cid);
17b0429d	331	if (err)
7ea239d9 PO	332	goto err;
7ea239d9 PO	333
6abaa0c9	334	if (oldcard) {
adf66a0d PO	335	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
adf66a0d PO	336	err = -ENOENT;
6abaa0c9	337	goto err;
adf66a0d	338	}
7ea239d9	339
6abaa0c9 PO	340	card = oldcard;
	341	} else {
	342	/*
	343	* Allocate card structure.
	344	*/
	345	card = mmc_alloc_card(host);
adf66a0d PO	346	if (IS_ERR(card)) {
adf66a0d PO	347	err = PTR_ERR(card);
6abaa0c9	348	goto err;
adf66a0d	349	}
6abaa0c9 PO	350
	351	card->type = MMC_TYPE_SD;
	352	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	353	}
7ea239d9 PO	354
	355	/*
	356	* Set card RCA.
	357	*/
	358	err = mmc_send_relative_addr(host, &card->rca);
17b0429d	359	if (err)
7ea239d9 PO	360	goto free_card;
	361
	362	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	363
6abaa0c9 PO	364	if (!oldcard) {
	365	/*
	366	* Fetch CSD from card.
	367	*/
	368	err = mmc_send_csd(card, card->raw_csd);
17b0429d	369	if (err)
6abaa0c9	370	goto free_card;
7ea239d9	371
bd766312	372	err = mmc_decode_csd(card);
adf66a0d	373	if (err)
bd766312 PO	374	goto free_card;
bd766312 PO	375
6abaa0c9 PO	376	mmc_decode_cid(card);
6abaa0c9 PO	377	}
7ea239d9 PO	378
7ea239d9 PO	379	/*
6abaa0c9	380	* Select card, as all following commands rely on that.
7ea239d9 PO	381	*/
7ea239d9 PO	382	err = mmc_select_card(card);
17b0429d	383	if (err)
7ea239d9 PO	384	goto free_card;
7ea239d9 PO	385
6abaa0c9 PO	386	if (!oldcard) {
	387	/*
	388	* Fetch SCR from card.
	389	*/
	390	err = mmc_app_send_scr(card, card->raw_scr);
17b0429d	391	if (err)
6abaa0c9	392	goto free_card;
7ea239d9	393
bd766312 PO	394	err = mmc_decode_scr(card);
	395	if (err < 0)
	396	goto free_card;
7ea239d9	397
6abaa0c9 PO	398	/*
	399	* Fetch switch information from card.
	400	*/
	401	err = mmc_read_switch(card);
17b0429d	402	if (err)
6abaa0c9 PO	403	goto free_card;
6abaa0c9 PO	404	}
1addfcdb PO	405
	406	/*
	407	* Attempt to change to high-speed (if supported)
7ea239d9 PO	408	*/
7ea239d9 PO	409	err = mmc_switch_hs(card);
17b0429d	410	if (err)
7ea239d9 PO	411	goto free_card;
	412
	413	/*
	414	* Compute bus speed.
	415	*/
	416	max_dtr = (unsigned int)-1;
	417
	418	if (mmc_card_highspeed(card)) {
	419	if (max_dtr > card->sw_caps.hs_max_dtr)
	420	max_dtr = card->sw_caps.hs_max_dtr;
	421	} else if (max_dtr > card->csd.max_dtr) {
	422	max_dtr = card->csd.max_dtr;
	423	}
	424
	425	mmc_set_clock(host, max_dtr);
	426
	427	/*
	428	* Switch to wider bus (if supported).
	429	*/
71651297	430	if ((host->caps & MMC_CAP_4_BIT_DATA) &&
7ea239d9 PO	431	(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
7ea239d9 PO	432	err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
17b0429d	433	if (err)
7ea239d9 PO	434	goto free_card;
	435
	436	mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
	437	}
	438
c3bff2ec PO	439	/*
	440	* Check if read-only switch is active.
	441	*/
	442	if (!oldcard) {
	443	if (!host->ops->get_ro) {
	444	printk(KERN_WARNING "%s: host does not "
	445	"support reading read-only "
	446	"switch. assuming write-enable.\n",
	447	mmc_hostname(host));
	448	} else {
	449	if (host->ops->get_ro(host))
	450	mmc_card_set_readonly(card);
	451	}
	452	}
	453
6abaa0c9 PO	454	if (!oldcard)
	455	host->card = card;
	456
17b0429d	457	return 0;
6abaa0c9 PO	458
	459	free_card:
	460	if (!oldcard)
	461	mmc_remove_card(card);
	462	err:
	463
adf66a0d	464	return err;
6abaa0c9 PO	465	}
	466
	467	/*
	468	* Host is being removed. Free up the current card.
	469	*/
	470	static void mmc_sd_remove(struct mmc_host *host)
	471	{
	472	BUG_ON(!host);
	473	BUG_ON(!host->card);
	474
	475	mmc_remove_card(host->card);
	476	host->card = NULL;
	477	}
	478
	479	/*
	480	* Card detection callback from host.
	481	*/
	482	static void mmc_sd_detect(struct mmc_host *host)
	483	{
	484	int err;
	485
	486	BUG_ON(!host);
	487	BUG_ON(!host->card);
	488
	489	mmc_claim_host(host);
	490
	491	/*
	492	* Just check if our card has been removed.
	493	*/
	494	err = mmc_send_status(host->card, NULL);
7ea239d9 PO	495
	496	mmc_release_host(host);
	497
17b0429d	498	if (err) {
4101c16a	499	mmc_sd_remove(host);
6abaa0c9 PO	500
	501	mmc_claim_host(host);
	502	mmc_detach_bus(host);
	503	mmc_release_host(host);
	504	}
	505	}
	506
4101c16a PO	507	MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	508	card->raw_cid[2], card->raw_cid[3]);
	509	MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	510	card->raw_csd[2], card->raw_csd[3]);
	511	MMC_ATTR_FN(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
	512	MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year);
	513	MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev);
	514	MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev);
	515	MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid);
	516	MMC_ATTR_FN(name, "%s\n", card->cid.prod_name);
	517	MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid);
	518	MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial);
	519
	520	static struct device_attribute mmc_sd_dev_attrs[] = {
	521	MMC_ATTR_RO(cid),
	522	MMC_ATTR_RO(csd),
	523	MMC_ATTR_RO(scr),
	524	MMC_ATTR_RO(date),
	525	MMC_ATTR_RO(fwrev),
	526	MMC_ATTR_RO(hwrev),
	527	MMC_ATTR_RO(manfid),
	528	MMC_ATTR_RO(name),
	529	MMC_ATTR_RO(oemid),
	530	MMC_ATTR_RO(serial),
	531	__ATTR_NULL,
	532	};
	533
	534	/*
	535	* Adds sysfs entries as relevant.
	536	*/
	537	static int mmc_sd_sysfs_add(struct mmc_host host, struct mmc_card card)
	538	{
	539	int ret;
	540
	541	ret = mmc_add_attrs(card, mmc_sd_dev_attrs);
	542	if (ret < 0)
	543	return ret;
	544
	545	return 0;
	546	}
	547
	548	/*
	549	* Removes the sysfs entries added by mmc_sysfs_add().
	550	*/
	551	static void mmc_sd_sysfs_remove(struct mmc_host host, struct mmc_card card)
	552	{
	553	mmc_remove_attrs(card, mmc_sd_dev_attrs);
	554	}
	555
6abaa0c9 PO	556	#ifdef CONFIG_MMC_UNSAFE_RESUME
	557
	558	/*
	559	* Suspend callback from host.
	560	*/
	561	static void mmc_sd_suspend(struct mmc_host *host)
	562	{
	563	BUG_ON(!host);
	564	BUG_ON(!host->card);
	565
	566	mmc_claim_host(host);
	567	mmc_deselect_cards(host);
	568	host->card->state &= ~MMC_STATE_HIGHSPEED;
	569	mmc_release_host(host);
	570	}
	571
	572	/*
	573	* Resume callback from host.
	574	*
	575	* This function tries to determine if the same card is still present
	576	* and, if so, restore all state to it.
	577	*/
	578	static void mmc_sd_resume(struct mmc_host *host)
	579	{
	580	int err;
	581
	582	BUG_ON(!host);
	583	BUG_ON(!host->card);
	584
	585	mmc_claim_host(host);
6abaa0c9	586	err = mmc_sd_init_card(host, host->ocr, host->card);
2986d0bf PO	587	mmc_release_host(host);
2986d0bf PO	588
17b0429d	589	if (err) {
4101c16a	590	mmc_sd_remove(host);
2986d0bf PO	591
2986d0bf PO	592	mmc_claim_host(host);
6abaa0c9	593	mmc_detach_bus(host);
2986d0bf	594	mmc_release_host(host);
6abaa0c9 PO	595	}
6abaa0c9 PO	596
6abaa0c9 PO	597	}
	598
	599	#else
	600
	601	#define mmc_sd_suspend NULL
	602	#define mmc_sd_resume NULL
	603
	604	#endif
	605
	606	static const struct mmc_bus_ops mmc_sd_ops = {
	607	.remove = mmc_sd_remove,
	608	.detect = mmc_sd_detect,
4101c16a PO	609	.sysfs_add = mmc_sd_sysfs_add,
4101c16a PO	610	.sysfs_remove = mmc_sd_sysfs_remove,
6abaa0c9 PO	611	.suspend = mmc_sd_suspend,
	612	.resume = mmc_sd_resume,
	613	};
	614
	615	/*
	616	* Starting point for SD card init.
	617	*/
	618	int mmc_attach_sd(struct mmc_host *host, u32 ocr)
	619	{
	620	int err;
	621
	622	BUG_ON(!host);
	623	BUG_ON(!host->claimed);
	624
	625	mmc_attach_bus(host, &mmc_sd_ops);
	626
	627	/*
	628	* Sanity check the voltages that the card claims to
	629	* support.
	630	*/
	631	if (ocr & 0x7F) {
	632	printk(KERN_WARNING "%s: card claims to support voltages "
	633	"below the defined range. These will be ignored.\n",
	634	mmc_hostname(host));
	635	ocr &= ~0x7F;
	636	}
	637
	638	if (ocr & MMC_VDD_165_195) {
	639	printk(KERN_WARNING "%s: SD card claims to support the "
	640	"incompletely defined 'low voltage range'. This "
	641	"will be ignored.\n", mmc_hostname(host));
	642	ocr &= ~MMC_VDD_165_195;
	643	}
	644
	645	host->ocr = mmc_select_voltage(host, ocr);
	646
	647	/*
	648	* Can we support the voltage(s) of the card(s)?
	649	*/
109b5bed PO	650	if (!host->ocr) {
109b5bed PO	651	err = -EINVAL;
6abaa0c9	652	goto err;
109b5bed	653	}
6abaa0c9 PO	654
	655	/*
	656	* Detect and init the card.
	657	*/
	658	err = mmc_sd_init_card(host, host->ocr, NULL);
17b0429d	659	if (err)
6abaa0c9 PO	660	goto err;
	661
	662	mmc_release_host(host);
	663
4101c16a	664	err = mmc_add_card(host->card);
7ea239d9	665	if (err)
2986d0bf	666	goto remove_card;
7ea239d9 PO	667
	668	return 0;
	669
2986d0bf	670	remove_card:
6abaa0c9	671	mmc_remove_card(host->card);
7ea239d9	672	host->card = NULL;
2986d0bf	673	mmc_claim_host(host);
7ea239d9 PO	674	err:
	675	mmc_detach_bus(host);
	676	mmc_release_host(host);
	677
109b5bed PO	678	printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
	679	mmc_hostname(host), err);
	680
adf66a0d	681	return err;
7ea239d9 PO	682	}
7ea239d9 PO	683