[linux-2.6-block.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/slab.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>
5a0e3ad6	14	#include <linux/slab.h>
7ea239d9 PO	15
	16	#include <linux/mmc/host.h>
	17	#include <linux/mmc/card.h>
	18	#include <linux/mmc/mmc.h>
3373c0ae	19	#include <linux/mmc/sd.h>
7ea239d9 PO	20
7ea239d9 PO	21	#include "core.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
7ea239d9 PO	169	resp[3] = card->raw_scr[1];
	170	resp[2] = card->raw_scr[0];
	171
	172	scr_struct = UNSTUFF_BITS(resp, 60, 4);
	173	if (scr_struct != 0) {
facba917	174	printk(KERN_ERR "%s: unrecognised SCR structure version %d\n",
7ea239d9	175	mmc_hostname(card->host), scr_struct);
bd766312	176	return -EINVAL;
7ea239d9 PO	177	}
	178
	179	scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
	180	scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
bd766312 PO	181
bd766312 PO	182	return 0;
7ea239d9 PO	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
3373c0ae	193	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
17b0429d	194	return 0;
3373c0ae PO	195
	196	if (!(card->csd.cmdclass & CCC_SWITCH)) {
	197	printk(KERN_WARNING "%s: card lacks mandatory switch "
	198	"function, performance might suffer.\n",
	199	mmc_hostname(card->host));
17b0429d	200	return 0;
3373c0ae PO	201	}
3373c0ae PO	202
17b0429d	203	err = -EIO;
7ea239d9 PO	204
	205	status = kmalloc(64, GFP_KERNEL);
	206	if (!status) {
facba917 PO	207	printk(KERN_ERR "%s: could not allocate a buffer for "
facba917 PO	208	"switch capabilities.\n", mmc_hostname(card->host));
17b0429d	209	return -ENOMEM;
7ea239d9 PO	210	}
	211
	212	err = mmc_sd_switch(card, 0, 0, 1, status);
17b0429d	213	if (err) {
d08ebedd WM	214	/* If the host or the card can't do the switch,
	215	* fail more gracefully. */
	216	if ((err != -EINVAL)
	217	&& (err != -ENOSYS)
	218	&& (err != -EFAULT))
adf66a0d PO	219	goto out;
adf66a0d PO	220
3373c0ae PO	221	printk(KERN_WARNING "%s: problem reading switch "
	222	"capabilities, performance might suffer.\n",
	223	mmc_hostname(card->host));
17b0429d	224	err = 0;
adf66a0d	225
7ea239d9 PO	226	goto out;
	227	}
	228
	229	if (status[13] & 0x02)
	230	card->sw_caps.hs_max_dtr = 50000000;
	231
1addfcdb PO	232	out:
	233	kfree(status);
	234
	235	return err;
	236	}
	237
	238	/*
	239	* Test if the card supports high-speed mode and, if so, switch to it.
	240	*/
	241	static int mmc_switch_hs(struct mmc_card *card)
	242	{
	243	int err;
	244	u8 *status;
	245
3373c0ae	246	if (card->scr.sda_vsn < SCR_SPEC_VER_1)
17b0429d	247	return 0;
3373c0ae PO	248
3373c0ae PO	249	if (!(card->csd.cmdclass & CCC_SWITCH))
17b0429d	250	return 0;
3373c0ae	251
1addfcdb	252	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
17b0429d	253	return 0;
1addfcdb PO	254
1addfcdb PO	255	if (card->sw_caps.hs_max_dtr == 0)
17b0429d	256	return 0;
1addfcdb	257
17b0429d	258	err = -EIO;
1addfcdb PO	259
	260	status = kmalloc(64, GFP_KERNEL);
	261	if (!status) {
facba917 PO	262	printk(KERN_ERR "%s: could not allocate a buffer for "
facba917 PO	263	"switch capabilities.\n", mmc_hostname(card->host));
17b0429d	264	return -ENOMEM;
1addfcdb PO	265	}
1addfcdb PO	266
7ea239d9	267	err = mmc_sd_switch(card, 1, 0, 1, status);
17b0429d	268	if (err)
7ea239d9 PO	269	goto out;
	270
	271	if ((status[16] & 0xF) != 1) {
	272	printk(KERN_WARNING "%s: Problem switching card "
	273	"into high-speed mode!\n",
	274	mmc_hostname(card->host));
	275	} else {
	276	mmc_card_set_highspeed(card);
	277	mmc_set_timing(card->host, MMC_TIMING_SD_HS);
	278	}
	279
	280	out:
	281	kfree(status);
	282
	283	return err;
	284	}
	285
51ec92e2 PO	286	MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
	287	card->raw_cid[2], card->raw_cid[3]);
	288	MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
	289	card->raw_csd[2], card->raw_csd[3]);
	290	MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
	291	MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
	292	MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
	293	MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
	294	MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
	295	MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
	296	MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
	297	MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
	298
	299
	300	static struct attribute *sd_std_attrs[] = {
	301	&dev_attr_cid.attr,
	302	&dev_attr_csd.attr,
	303	&dev_attr_scr.attr,
	304	&dev_attr_date.attr,
	305	&dev_attr_fwrev.attr,
	306	&dev_attr_hwrev.attr,
	307	&dev_attr_manfid.attr,
	308	&dev_attr_name.attr,
	309	&dev_attr_oemid.attr,
	310	&dev_attr_serial.attr,
	311	NULL,
	312	};
	313
	314	static struct attribute_group sd_std_attr_group = {
	315	.attrs = sd_std_attrs,
	316	};
	317
a4dbd674	318	static const struct attribute_group *sd_attr_groups[] = {
51ec92e2 PO	319	&sd_std_attr_group,
	320	NULL,
	321	};
	322
	323	static struct device_type sd_type = {
	324	.groups = sd_attr_groups,
	325	};
	326
7ea239d9	327	/*
6abaa0c9 PO	328	* Handle the detection and initialisation of a card.
6abaa0c9 PO	329	*
8769392b	330	* In the case of a resume, "oldcard" will contain the card
6abaa0c9	331	* we're trying to reinitialise.
7ea239d9	332	*/
6abaa0c9 PO	333	static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
6abaa0c9 PO	334	struct mmc_card *oldcard)
7ea239d9 PO	335	{
	336	struct mmc_card *card;
	337	int err;
	338	u32 cid[4];
	339	unsigned int max_dtr;
	340
	341	BUG_ON(!host);
d84075c8	342	WARN_ON(!host->claimed);
7ea239d9	343
7ea239d9 PO	344	/*
	345	* Since we're changing the OCR value, we seem to
	346	* need to tell some cards to go back to the idle
	347	* state. We wait 1ms to give cards time to
	348	* respond.
	349	*/
	350	mmc_go_idle(host);
	351
	352	/*
	353	* If SD_SEND_IF_COND indicates an SD 2.0
	354	* compliant card and we should set bit 30
	355	* of the ocr to indicate that we can handle
	356	* block-addressed SDHC cards.
	357	*/
6abaa0c9	358	err = mmc_send_if_cond(host, ocr);
17b0429d	359	if (!err)
6abaa0c9	360	ocr \|= 1 << 30;
7ea239d9	361
6abaa0c9	362	err = mmc_send_app_op_cond(host, ocr, NULL);
17b0429d	363	if (err)
6abaa0c9	364	goto err;
7ea239d9 PO	365
	366	/*
	367	* Fetch CID from card.
	368	*/
af517150 DB	369	if (mmc_host_is_spi(host))
	370	err = mmc_send_cid(host, cid);
	371	else
	372	err = mmc_all_send_cid(host, cid);
17b0429d	373	if (err)
7ea239d9 PO	374	goto err;
7ea239d9 PO	375
6abaa0c9	376	if (oldcard) {
adf66a0d PO	377	if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
adf66a0d PO	378	err = -ENOENT;
6abaa0c9	379	goto err;
adf66a0d	380	}
7ea239d9	381
6abaa0c9 PO	382	card = oldcard;
	383	} else {
	384	/*
	385	* Allocate card structure.
	386	*/
51ec92e2	387	card = mmc_alloc_card(host, &sd_type);
adf66a0d PO	388	if (IS_ERR(card)) {
adf66a0d PO	389	err = PTR_ERR(card);
6abaa0c9	390	goto err;
adf66a0d	391	}
6abaa0c9 PO	392
	393	card->type = MMC_TYPE_SD;
	394	memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
	395	}
7ea239d9 PO	396
7ea239d9 PO	397	/*
af517150	398	* For native busses: get card RCA and quit open drain mode.
7ea239d9	399	*/
af517150 DB	400	if (!mmc_host_is_spi(host)) {
	401	err = mmc_send_relative_addr(host, &card->rca);
	402	if (err)
	403	goto free_card;
7ea239d9	404
af517150 DB	405	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
af517150 DB	406	}
7ea239d9	407
6abaa0c9 PO	408	if (!oldcard) {
	409	/*
	410	* Fetch CSD from card.
	411	*/
	412	err = mmc_send_csd(card, card->raw_csd);
17b0429d	413	if (err)
6abaa0c9	414	goto free_card;
7ea239d9	415
bd766312	416	err = mmc_decode_csd(card);
adf66a0d	417	if (err)
bd766312 PO	418	goto free_card;
bd766312 PO	419
6abaa0c9 PO	420	mmc_decode_cid(card);
6abaa0c9 PO	421	}
7ea239d9 PO	422
7ea239d9 PO	423	/*
6abaa0c9	424	* Select card, as all following commands rely on that.
7ea239d9	425	*/
af517150 DB	426	if (!mmc_host_is_spi(host)) {
	427	err = mmc_select_card(card);
	428	if (err)
	429	goto free_card;
	430	}
7ea239d9	431
6abaa0c9 PO	432	if (!oldcard) {
	433	/*
	434	* Fetch SCR from card.
	435	*/
	436	err = mmc_app_send_scr(card, card->raw_scr);
17b0429d	437	if (err)
6abaa0c9	438	goto free_card;
7ea239d9	439
bd766312 PO	440	err = mmc_decode_scr(card);
	441	if (err < 0)
	442	goto free_card;
7ea239d9	443
6abaa0c9 PO	444	/*
	445	* Fetch switch information from card.
	446	*/
	447	err = mmc_read_switch(card);
17b0429d	448	if (err)
6abaa0c9 PO	449	goto free_card;
6abaa0c9 PO	450	}
1addfcdb	451
9d9f25c0 WM	452	/*
	453	* For SPI, enable CRC as appropriate.
	454	* This CRC enable is located AFTER the reading of the
	455	* card registers because some SDHC cards are not able
	456	* to provide valid CRCs for non-512-byte blocks.
	457	*/
	458	if (mmc_host_is_spi(host)) {
	459	err = mmc_spi_set_crc(host, use_spi_crc);
	460	if (err)
	461	goto free_card;
	462	}
	463
1addfcdb PO	464	/*
1addfcdb PO	465	* Attempt to change to high-speed (if supported)
7ea239d9 PO	466	*/
7ea239d9 PO	467	err = mmc_switch_hs(card);
17b0429d	468	if (err)
7ea239d9 PO	469	goto free_card;
	470
	471	/*
	472	* Compute bus speed.
	473	*/
	474	max_dtr = (unsigned int)-1;
	475
	476	if (mmc_card_highspeed(card)) {
	477	if (max_dtr > card->sw_caps.hs_max_dtr)
	478	max_dtr = card->sw_caps.hs_max_dtr;
	479	} else if (max_dtr > card->csd.max_dtr) {
	480	max_dtr = card->csd.max_dtr;
	481	}
	482
	483	mmc_set_clock(host, max_dtr);
	484
	485	/*
	486	* Switch to wider bus (if supported).
	487	*/
71651297	488	if ((host->caps & MMC_CAP_4_BIT_DATA) &&
7ea239d9 PO	489	(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
7ea239d9 PO	490	err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
17b0429d	491	if (err)
7ea239d9 PO	492	goto free_card;
	493
	494	mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
	495	}
	496
c3bff2ec PO	497	/*
	498	* Check if read-only switch is active.
	499	*/
	500	if (!oldcard) {
08f80bb5	501	if (!host->ops->get_ro \|\| host->ops->get_ro(host) < 0) {
c3bff2ec PO	502	printk(KERN_WARNING "%s: host does not "
	503	"support reading read-only "
	504	"switch. assuming write-enable.\n",
	505	mmc_hostname(host));
	506	} else {
08f80bb5	507	if (host->ops->get_ro(host) > 0)
c3bff2ec PO	508	mmc_card_set_readonly(card);
	509	}
	510	}
	511
6abaa0c9 PO	512	if (!oldcard)
	513	host->card = card;
	514
17b0429d	515	return 0;
6abaa0c9 PO	516
	517	free_card:
	518	if (!oldcard)
	519	mmc_remove_card(card);
	520	err:
	521
adf66a0d	522	return err;
6abaa0c9 PO	523	}
	524
	525	/*
	526	* Host is being removed. Free up the current card.
	527	*/
	528	static void mmc_sd_remove(struct mmc_host *host)
	529	{
	530	BUG_ON(!host);
	531	BUG_ON(!host->card);
	532
	533	mmc_remove_card(host->card);
	534	host->card = NULL;
	535	}
	536
	537	/*
	538	* Card detection callback from host.
	539	*/
	540	static void mmc_sd_detect(struct mmc_host *host)
	541	{
	542	int err;
	543
	544	BUG_ON(!host);
	545	BUG_ON(!host->card);
	546
	547	mmc_claim_host(host);
	548
	549	/*
	550	* Just check if our card has been removed.
	551	*/
	552	err = mmc_send_status(host->card, NULL);
7ea239d9 PO	553
	554	mmc_release_host(host);
	555
17b0429d	556	if (err) {
4101c16a	557	mmc_sd_remove(host);
6abaa0c9 PO	558
	559	mmc_claim_host(host);
	560	mmc_detach_bus(host);
	561	mmc_release_host(host);
	562	}
	563	}
	564
6abaa0c9 PO	565	/*
	566	* Suspend callback from host.
	567	*/
95cdfb72	568	static int mmc_sd_suspend(struct mmc_host *host)
6abaa0c9 PO	569	{
	570	BUG_ON(!host);
	571	BUG_ON(!host->card);
	572
	573	mmc_claim_host(host);
af517150 DB	574	if (!mmc_host_is_spi(host))
af517150 DB	575	mmc_deselect_cards(host);
6abaa0c9 PO	576	host->card->state &= ~MMC_STATE_HIGHSPEED;
6abaa0c9 PO	577	mmc_release_host(host);
95cdfb72 NP	578
95cdfb72 NP	579	return 0;
6abaa0c9 PO	580	}
	581
	582	/*
	583	* Resume callback from host.
	584	*
	585	* This function tries to determine if the same card is still present
	586	* and, if so, restore all state to it.
	587	*/
95cdfb72	588	static int mmc_sd_resume(struct mmc_host *host)
6abaa0c9 PO	589	{
	590	int err;
	591
	592	BUG_ON(!host);
	593	BUG_ON(!host->card);
	594
	595	mmc_claim_host(host);
6abaa0c9	596	err = mmc_sd_init_card(host, host->ocr, host->card);
2986d0bf PO	597	mmc_release_host(host);
2986d0bf PO	598
95cdfb72	599	return err;
6abaa0c9 PO	600	}
6abaa0c9 PO	601
eae1aeee AH	602	static void mmc_sd_power_restore(struct mmc_host *host)
	603	{
	604	host->card->state &= ~MMC_STATE_HIGHSPEED;
	605	mmc_claim_host(host);
	606	mmc_sd_init_card(host, host->ocr, host->card);
	607	mmc_release_host(host);
	608	}
	609
6abaa0c9	610	static const struct mmc_bus_ops mmc_sd_ops = {
9feae246 AH	611	.remove = mmc_sd_remove,
	612	.detect = mmc_sd_detect,
	613	.suspend = NULL,
	614	.resume = NULL,
eae1aeee	615	.power_restore = mmc_sd_power_restore,
9feae246 AH	616	};
	617
	618	static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
6abaa0c9 PO	619	.remove = mmc_sd_remove,
	620	.detect = mmc_sd_detect,
	621	.suspend = mmc_sd_suspend,
	622	.resume = mmc_sd_resume,
eae1aeee	623	.power_restore = mmc_sd_power_restore,
6abaa0c9 PO	624	};
6abaa0c9 PO	625
9feae246 AH	626	static void mmc_sd_attach_bus_ops(struct mmc_host *host)
	627	{
	628	const struct mmc_bus_ops *bus_ops;
	629
bd68e083	630	if (host->caps & MMC_CAP_NONREMOVABLE \|\| !mmc_assume_removable)
9feae246 AH	631	bus_ops = &mmc_sd_ops_unsafe;
	632	else
	633	bus_ops = &mmc_sd_ops;
	634	mmc_attach_bus(host, bus_ops);
	635	}
	636
6abaa0c9 PO	637	/*
	638	* Starting point for SD card init.
	639	*/
	640	int mmc_attach_sd(struct mmc_host *host, u32 ocr)
	641	{
	642	int err;
	643
	644	BUG_ON(!host);
d84075c8	645	WARN_ON(!host->claimed);
6abaa0c9	646
9feae246	647	mmc_sd_attach_bus_ops(host);
6abaa0c9	648
af517150 DB	649	/*
	650	* We need to get OCR a different way for SPI.
	651	*/
	652	if (mmc_host_is_spi(host)) {
	653	mmc_go_idle(host);
	654
	655	err = mmc_spi_read_ocr(host, 0, &ocr);
	656	if (err)
	657	goto err;
	658	}
	659
6abaa0c9 PO	660	/*
	661	* Sanity check the voltages that the card claims to
	662	* support.
	663	*/
	664	if (ocr & 0x7F) {
	665	printk(KERN_WARNING "%s: card claims to support voltages "
	666	"below the defined range. These will be ignored.\n",
	667	mmc_hostname(host));
	668	ocr &= ~0x7F;
	669	}
	670
	671	if (ocr & MMC_VDD_165_195) {
	672	printk(KERN_WARNING "%s: SD card claims to support the "
	673	"incompletely defined 'low voltage range'. This "
	674	"will be ignored.\n", mmc_hostname(host));
	675	ocr &= ~MMC_VDD_165_195;
	676	}
	677
	678	host->ocr = mmc_select_voltage(host, ocr);
	679
	680	/*
	681	* Can we support the voltage(s) of the card(s)?
	682	*/
109b5bed PO	683	if (!host->ocr) {
109b5bed PO	684	err = -EINVAL;
6abaa0c9	685	goto err;
109b5bed	686	}
6abaa0c9 PO	687
	688	/*
	689	* Detect and init the card.
	690	*/
	691	err = mmc_sd_init_card(host, host->ocr, NULL);
17b0429d	692	if (err)
6abaa0c9 PO	693	goto err;
	694
	695	mmc_release_host(host);
	696
4101c16a	697	err = mmc_add_card(host->card);
7ea239d9	698	if (err)
2986d0bf	699	goto remove_card;
7ea239d9 PO	700
	701	return 0;
	702
2986d0bf	703	remove_card:
6abaa0c9	704	mmc_remove_card(host->card);
7ea239d9	705	host->card = NULL;
2986d0bf	706	mmc_claim_host(host);
7ea239d9 PO	707	err:
	708	mmc_detach_bus(host);
	709	mmc_release_host(host);
	710
109b5bed PO	711	printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
	712	mmc_hostname(host), err);
	713
adf66a0d	714	return err;
7ea239d9 PO	715	}
7ea239d9 PO	716