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

/*
 *  linux/drivers/mmc/sdio.c
 *
 *  Copyright 2006-2007 Pierre Ossman
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#include <linux/err.h>

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

#include "core.h"
#include "bus.h"
#include "sd.h"
#include "sdio_bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
#include "sdio_ops.h"
#include "sdio_cis.h"

static int sdio_read_fbr(struct sdio_func *func)
{
	int ret;
	unsigned char data;

	ret = mmc_io_rw_direct(func->card, 0, 0,
		SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
	if (ret)
		goto out;

	data &= 0x0f;

	if (data == 0x0f) {
		ret = mmc_io_rw_direct(func->card, 0, 0,
			SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
		if (ret)
			goto out;
	}

	func->class = data;

out:
	return ret;
}

static int sdio_init_func(struct mmc_card *card, unsigned int fn)
{
	int ret;
	struct sdio_func *func;

	BUG_ON(fn > SDIO_MAX_FUNCS);

	func = sdio_alloc_func(card);
	if (IS_ERR(func))
		return PTR_ERR(func);

	func->num = fn;

	if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
		ret = sdio_read_fbr(func);
		if (ret)
			goto fail;

		ret = sdio_read_func_cis(func);
		if (ret)
			goto fail;
	} else {
		func->vendor = func->card->cis.vendor;
		func->device = func->card->cis.device;
		func->max_blksize = func->card->cis.blksize;
	}

	card->sdio_func[fn - 1] = func;

	return 0;

fail:
	/*
	 * It is okay to remove the function here even though we hold
	 * the host lock as we haven't registered the device yet.
	 */
	sdio_remove_func(func);
	return ret;
}

static int sdio_read_cccr(struct mmc_card *card)
{
	int ret;
	int cccr_vsn;
	unsigned char data;

	memset(&card->cccr, 0, sizeof(struct sdio_cccr));

	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
	if (ret)
		goto out;

	cccr_vsn = data & 0x0f;

	if (cccr_vsn > SDIO_CCCR_REV_1_20) {
		printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
			mmc_hostname(card->host), cccr_vsn);
		return -EINVAL;
	}

	card->cccr.sdio_vsn = (data & 0xf0) >> 4;

	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
	if (ret)
		goto out;

	if (data & SDIO_CCCR_CAP_SMB)
		card->cccr.multi_block = 1;
	if (data & SDIO_CCCR_CAP_LSC)
		card->cccr.low_speed = 1;
	if (data & SDIO_CCCR_CAP_4BLS)
		card->cccr.wide_bus = 1;

	if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
		ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
		if (ret)
			goto out;

		if (data & SDIO_POWER_SMPC)
			card->cccr.high_power = 1;
	}

	if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
		ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
		if (ret)
			goto out;

		if (data & SDIO_SPEED_SHS)
			card->cccr.high_speed = 1;
	}

out:
	return ret;
}

static int sdio_enable_wide(struct mmc_card *card)
{
	int ret;
	u8 ctrl;

	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
		return 0;

	if (card->cccr.low_speed && !card->cccr.wide_bus)
		return 0;

	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
	if (ret)
		return ret;

	ctrl |= SDIO_BUS_WIDTH_4BIT;

	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
	if (ret)
		return ret;

	return 1;
}

/*
 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
 * of the card. This may be required on certain setups of boards,
 * controllers and embedded sdio device which do not need the card's
 * pull-up. As a result, card detection is disabled and power is saved.
 */
static int sdio_disable_cd(struct mmc_card *card)
{
	int ret;
	u8 ctrl;

	if (!card->cccr.disable_cd)
		return 0;

	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
	if (ret)
		return ret;

	ctrl |= SDIO_BUS_CD_DISABLE;

	return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
}

/*
 * Devices that remain active during a system suspend are
 * put back into 1-bit mode.
 */
static int sdio_disable_wide(struct mmc_card *card)
{
	int ret;
	u8 ctrl;

	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
		return 0;

	if (card->cccr.low_speed && !card->cccr.wide_bus)
		return 0;

	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
	if (ret)
		return ret;

	if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
		return 0;

	ctrl &= ~SDIO_BUS_WIDTH_4BIT;
	ctrl |= SDIO_BUS_ASYNC_INT;

	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
	if (ret)
		return ret;

	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);

	return 0;
}


static int sdio_enable_4bit_bus(struct mmc_card *card)
{
	int err;

	if (card->type == MMC_TYPE_SDIO)
		return sdio_enable_wide(card);

	if ((card->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)
			return err;
	} else
		return 0;

	err = sdio_enable_wide(card);
	if (err <= 0)
		mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);

	return err;
}


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

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

	if (!card->cccr.high_speed)
		return 0;

	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
	if (ret)
		return ret;

	if (enable)
		speed |= SDIO_SPEED_EHS;
	else
		speed &= ~SDIO_SPEED_EHS;

	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
	if (ret)
		return ret;

	return 1;
}

/*
 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
 */
static int sdio_enable_hs(struct mmc_card *card)
{
	int ret;

	ret = mmc_sdio_switch_hs(card, true);
	if (ret <= 0 || card->type == MMC_TYPE_SDIO)
		return ret;

	ret = mmc_sd_switch_hs(card);
	if (ret <= 0)
		mmc_sdio_switch_hs(card, false);

	return ret;
}

static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
{
	unsigned max_dtr;

	if (mmc_card_highspeed(card)) {
		/*
		 * The SDIO specification doesn't mention how
		 * the CIS transfer speed register relates to
		 * high-speed, but it seems that 50 MHz is
		 * mandatory.
		 */
		max_dtr = 50000000;
	} else {
		max_dtr = card->cis.max_dtr;
	}

	if (card->type == MMC_TYPE_SD_COMBO)
		max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));

	return max_dtr;
}

/*
 * 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_sdio_init_card(struct mmc_host *host, u32 ocr,
			      struct mmc_card *oldcard, int powered_resume)
{
	struct mmc_card *card;
	int err;

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

	/*
	 * Inform the card of the voltage
	 */
	if (!powered_resume) {
		err = mmc_send_io_op_cond(host, host->ocr, &ocr);
		if (err)
			goto err;
	}

	/*
	 * For SPI, enable CRC as appropriate.
	 */
	if (mmc_host_is_spi(host)) {
		err = mmc_spi_set_crc(host, use_spi_crc);
		if (err)
			goto err;
	}

	/*
	 * Allocate card structure.
	 */
	card = mmc_alloc_card(host, NULL);
	if (IS_ERR(card)) {
		err = PTR_ERR(card);
		goto err;
	}

	if (ocr & R4_MEMORY_PRESENT
	    && mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid) == 0) {
		card->type = MMC_TYPE_SD_COMBO;

		if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
		    memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
			mmc_remove_card(card);
			return -ENOENT;
		}
	} else {
		card->type = MMC_TYPE_SDIO;

		if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
			mmc_remove_card(card);
			return -ENOENT;
		}
	}

	/*
	 * Call the optional HC's init_card function to handle quirks.
	 */
	if (host->ops->init_card)
		host->ops->init_card(host, card);

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

		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	}

	/*
	 * Read CSD, before selecting the card
	 */
	if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
		err = mmc_sd_get_csd(host, card);
		if (err)
			return err;

		mmc_decode_cid(card);
	}

	/*
	 * Select card, as all following commands rely on that.
	 */
	if (!powered_resume && !mmc_host_is_spi(host)) {
		err = mmc_select_card(card);
		if (err)
			goto remove;
	}

	if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
		/*
		 * This is non-standard SDIO device, meaning it doesn't
		 * have any CIA (Common I/O area) registers present.
		 * It's host's responsibility to fill cccr and cis
		 * structures in init_card().
		 */
		mmc_set_clock(host, card->cis.max_dtr);

		if (card->cccr.high_speed) {
			mmc_card_set_highspeed(card);
			mmc_set_timing(card->host, MMC_TIMING_SD_HS);
		}

		goto finish;
	}

	/*
	 * Read the common registers.
	 */
	err = sdio_read_cccr(card);
	if (err)
		goto remove;

	/*
	 * Read the common CIS tuples.
	 */
	err = sdio_read_common_cis(card);
	if (err)
		goto remove;

	if (oldcard) {
		int same = (card->cis.vendor == oldcard->cis.vendor &&
			    card->cis.device == oldcard->cis.device);
		mmc_remove_card(card);
		if (!same)
			return -ENOENT;

		card = oldcard;
		return 0;
	}

	if (card->type == MMC_TYPE_SD_COMBO) {
		err = mmc_sd_setup_card(host, card, oldcard != NULL);
		/* handle as SDIO-only card if memory init failed */
		if (err) {
			mmc_go_idle(host);
			if (mmc_host_is_spi(host))
				/* should not fail, as it worked previously */
				mmc_spi_set_crc(host, use_spi_crc);
			card->type = MMC_TYPE_SDIO;
		} else
			card->dev.type = &sd_type;
	}

	/*
	 * If needed, disconnect card detection pull-up resistor.
	 */
	err = sdio_disable_cd(card);
	if (err)
		goto remove;

	/*
	 * Switch to high-speed (if supported).
	 */
	err = sdio_enable_hs(card);
	if (err > 0)
		mmc_sd_go_highspeed(card);
	else if (err)
		goto remove;

	/*
	 * Change to the card's maximum speed.
	 */
	mmc_set_clock(host, mmc_sdio_get_max_clock(card));

	/*
	 * Switch to wider bus (if supported).
	 */
	err = sdio_enable_4bit_bus(card);
	if (err > 0)
		mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	else if (err)
		goto remove;

finish:
	if (!oldcard)
		host->card = card;
	return 0;

remove:
	if (!oldcard)
		mmc_remove_card(card);

err:
	return err;
}

/*
 * Host is being removed. Free up the current card.
 */
static void mmc_sdio_remove(struct mmc_host *host)
{
	int i;

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

	for (i = 0;i < host->card->sdio_funcs;i++) {
		if (host->card->sdio_func[i]) {
			sdio_remove_func(host->card->sdio_func[i]);
			host->card->sdio_func[i] = NULL;
		}
	}

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

/*
 * Card detection callback from host.
 */
static void mmc_sdio_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_select_card(host->card);

	mmc_release_host(host);

	if (err) {
		mmc_sdio_remove(host);

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

/*
 * SDIO suspend.  We need to suspend all functions separately.
 * Therefore all registered functions must have drivers with suspend
 * and resume methods.  Failing that we simply remove the whole card.
 */
static int mmc_sdio_suspend(struct mmc_host *host)
{
	int i, err = 0;

	for (i = 0; i < host->card->sdio_funcs; i++) {
		struct sdio_func *func = host->card->sdio_func[i];
		if (func && sdio_func_present(func) && func->dev.driver) {
			const struct dev_pm_ops *pmops = func->dev.driver->pm;
			if (!pmops || !pmops->suspend || !pmops->resume) {
				/* force removal of entire card in that case */
				err = -ENOSYS;
			} else
				err = pmops->suspend(&func->dev);
			if (err)
				break;
		}
	}
	while (err && --i >= 0) {
		struct sdio_func *func = host->card->sdio_func[i];
		if (func && sdio_func_present(func) && func->dev.driver) {
			const struct dev_pm_ops *pmops = func->dev.driver->pm;
			pmops->resume(&func->dev);
		}
	}

	if (!err && host->pm_flags & MMC_PM_KEEP_POWER) {
		mmc_claim_host(host);
		sdio_disable_wide(host->card);
		mmc_release_host(host);
	}

	return err;
}

static int mmc_sdio_resume(struct mmc_host *host)
{
	int i, err;

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

	/* Basic card reinitialization. */
	mmc_claim_host(host);
	err = mmc_sdio_init_card(host, host->ocr, host->card,
				 (host->pm_flags & MMC_PM_KEEP_POWER));
	if (!err) {
		/* We may have switched to 1-bit mode during suspend. */
		err = sdio_enable_4bit_bus(host->card);
		if (err > 0) {
			mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
			err = 0;
		}
	}
	if (!err && host->sdio_irqs)
		mmc_signal_sdio_irq(host);
	mmc_release_host(host);

	/*
	 * If the card looked to be the same as before suspending, then
	 * we proceed to resume all card functions.  If one of them returns
	 * an error then we simply return that error to the core and the
	 * card will be redetected as new.  It is the responsibility of
	 * the function driver to perform further tests with the extra
	 * knowledge it has of the card to confirm the card is indeed the
	 * same as before suspending (same MAC address for network cards,
	 * etc.) and return an error otherwise.
	 */
	for (i = 0; !err && i < host->card->sdio_funcs; i++) {
		struct sdio_func *func = host->card->sdio_func[i];
		if (func && sdio_func_present(func) && func->dev.driver) {
			const struct dev_pm_ops *pmops = func->dev.driver->pm;
			err = pmops->resume(&func->dev);
		}
	}

	return err;
}

static const struct mmc_bus_ops mmc_sdio_ops = {
	.remove = mmc_sdio_remove,
	.detect = mmc_sdio_detect,
	.suspend = mmc_sdio_suspend,
	.resume = mmc_sdio_resume,
};


/*
 * Starting point for SDIO card init.
 */
int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
{
	int err;
	int i, funcs;
	struct mmc_card *card;

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

	mmc_attach_bus(host, &mmc_sdio_ops);

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

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

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

	/*
	 * Detect and init the card.
	 */
	err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
	if (err)
		goto err;
	card = host->card;

	/*
	 * The number of functions on the card is encoded inside
	 * the ocr.
	 */
	funcs = (ocr & 0x70000000) >> 28;
	card->sdio_funcs = 0;

	/*
	 * Initialize (but don't add) all present functions.
	 */
	for (i = 0; i < funcs; i++, card->sdio_funcs++) {
		err = sdio_init_func(host->card, i + 1);
		if (err)
			goto remove;
	}

	mmc_release_host(host);

	/*
	 * First add the card to the driver model...
	 */
	err = mmc_add_card(host->card);
	if (err)
		goto remove_added;

	/*
	 * ...then the SDIO functions.
	 */
	for (i = 0;i < funcs;i++) {
		err = sdio_add_func(host->card->sdio_func[i]);
		if (err)
			goto remove_added;
	}

	return 0;


remove_added:
	/* Remove without lock if the device has been added. */
	mmc_sdio_remove(host);
	mmc_claim_host(host);
remove:
	/* And with lock if it hasn't been added. */
	if (host->card)
		mmc_sdio_remove(host);
err:
	mmc_detach_bus(host);
	mmc_release_host(host);

	printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
		mmc_hostname(host), err);

	return err;
}
Commit	Line	Data
5c4e6f13 PO	1	/*
	2	* linux/drivers/mmc/sdio.c
	3	*
	4	* Copyright 2006-2007 Pierre Ossman
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or (at
	9	* your option) any later version.
	10	*/
	11
	12	#include <linux/err.h>
	13
	14	#include <linux/mmc/host.h>
	15	#include <linux/mmc/card.h>
35c66c19	16	#include <linux/mmc/sdio.h>
e29a7d73	17	#include <linux/mmc/sdio_func.h>
5c4e6f13 PO	18
	19	#include "core.h"
	20	#include "bus.h"
71578a1e	21	#include "sd.h"
e29a7d73	22	#include "sdio_bus.h"
5c4e6f13 PO	23	#include "mmc_ops.h"
	24	#include "sd_ops.h"
	25	#include "sdio_ops.h"
b7261261	26	#include "sdio_cis.h"
5c4e6f13	27
0597007f PO	28	static int sdio_read_fbr(struct sdio_func *func)
	29	{
	30	int ret;
	31	unsigned char data;
	32
	33	ret = mmc_io_rw_direct(func->card, 0, 0,
7616ee95	34	SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
0597007f PO	35	if (ret)
	36	goto out;
	37
	38	data &= 0x0f;
	39
	40	if (data == 0x0f) {
	41	ret = mmc_io_rw_direct(func->card, 0, 0,
7616ee95	42	SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
0597007f PO	43	if (ret)
	44	goto out;
	45	}
	46
	47	func->class = data;
	48
	49	out:
	50	return ret;
	51	}
	52
e29a7d73 PO	53	static int sdio_init_func(struct mmc_card *card, unsigned int fn)
e29a7d73 PO	54	{
0597007f	55	int ret;
e29a7d73 PO	56	struct sdio_func *func;
	57
	58	BUG_ON(fn > SDIO_MAX_FUNCS);
	59
	60	func = sdio_alloc_func(card);
	61	if (IS_ERR(func))
	62	return PTR_ERR(func);
	63
	64	func->num = fn;
	65
6f51be3d GI	66	if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
	67	ret = sdio_read_fbr(func);
	68	if (ret)
	69	goto fail;
0597007f	70
6f51be3d GI	71	ret = sdio_read_func_cis(func);
	72	if (ret)
	73	goto fail;
	74	} else {
	75	func->vendor = func->card->cis.vendor;
	76	func->device = func->card->cis.device;
	77	func->max_blksize = func->card->cis.blksize;
	78	}
b7261261	79
e29a7d73 PO	80	card->sdio_func[fn - 1] = func;
	81
	82	return 0;
0597007f PO	83
	84	fail:
	85	/*
	86	* It is okay to remove the function here even though we hold
	87	* the host lock as we haven't registered the device yet.
	88	*/
	89	sdio_remove_func(func);
	90	return ret;
e29a7d73 PO	91	}
e29a7d73 PO	92
35c66c19 PO	93	static int sdio_read_cccr(struct mmc_card *card)
	94	{
	95	int ret;
	96	int cccr_vsn;
	97	unsigned char data;
	98
	99	memset(&card->cccr, 0, sizeof(struct sdio_cccr));
	100
	101	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
	102	if (ret)
	103	goto out;
	104
	105	cccr_vsn = data & 0x0f;
	106
	107	if (cccr_vsn > SDIO_CCCR_REV_1_20) {
	108	printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
	109	mmc_hostname(card->host), cccr_vsn);
	110	return -EINVAL;
	111	}
	112
	113	card->cccr.sdio_vsn = (data & 0xf0) >> 4;
	114
	115	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
	116	if (ret)
	117	goto out;
	118
	119	if (data & SDIO_CCCR_CAP_SMB)
	120	card->cccr.multi_block = 1;
	121	if (data & SDIO_CCCR_CAP_LSC)
	122	card->cccr.low_speed = 1;
	123	if (data & SDIO_CCCR_CAP_4BLS)
	124	card->cccr.wide_bus = 1;
	125
	126	if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
	127	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
	128	if (ret)
	129	goto out;
	130
	131	if (data & SDIO_POWER_SMPC)
	132	card->cccr.high_power = 1;
	133	}
	134
	135	if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
	136	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
	137	if (ret)
	138	goto out;
	139
	140	if (data & SDIO_SPEED_SHS)
	141	card->cccr.high_speed = 1;
	142	}
	143
	144	out:
	145	return ret;
	146	}
	147
4ff6471c PO	148	static int sdio_enable_wide(struct mmc_card *card)
	149	{
	150	int ret;
	151	u8 ctrl;
	152
	153	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
	154	return 0;
	155
	156	if (card->cccr.low_speed && !card->cccr.wide_bus)
	157	return 0;
	158
	159	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
	160	if (ret)
	161	return ret;
	162
	163	ctrl \|= SDIO_BUS_WIDTH_4BIT;
	164
	165	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
	166	if (ret)
	167	return ret;
	168
7310ece8	169	return 1;
4ff6471c PO	170	}
4ff6471c PO	171
006ebd5d OBC	172	/*
	173	* If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
	174	* of the card. This may be required on certain setups of boards,
	175	* controllers and embedded sdio device which do not need the card's
	176	* pull-up. As a result, card detection is disabled and power is saved.
	177	*/
	178	static int sdio_disable_cd(struct mmc_card *card)
	179	{
	180	int ret;
	181	u8 ctrl;
	182
	183	if (!card->cccr.disable_cd)
	184	return 0;
	185
	186	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
	187	if (ret)
	188	return ret;
	189
	190	ctrl \|= SDIO_BUS_CD_DISABLE;
	191
	192	return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
	193	}
	194
6b5eda36 DD	195	/*
	196	* Devices that remain active during a system suspend are
	197	* put back into 1-bit mode.
	198	*/
	199	static int sdio_disable_wide(struct mmc_card *card)
	200	{
	201	int ret;
	202	u8 ctrl;
	203
	204	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
	205	return 0;
	206
	207	if (card->cccr.low_speed && !card->cccr.wide_bus)
	208	return 0;
	209
	210	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
	211	if (ret)
	212	return ret;
	213
	214	if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
	215	return 0;
	216
	217	ctrl &= ~SDIO_BUS_WIDTH_4BIT;
	218	ctrl \|= SDIO_BUS_ASYNC_INT;
	219
	220	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
	221	if (ret)
	222	return ret;
	223
	224	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
	225
	226	return 0;
	227	}
	228
7310ece8 MM	229
	230	static int sdio_enable_4bit_bus(struct mmc_card *card)
	231	{
	232	int err;
	233
	234	if (card->type == MMC_TYPE_SDIO)
	235	return sdio_enable_wide(card);
	236
	237	if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
	238	(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
	239	err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
	240	if (err)
	241	return err;
	242	} else
	243	return 0;
	244
	245	err = sdio_enable_wide(card);
	246	if (err <= 0)
	247	mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
	248
	249	return err;
	250	}
	251
	252
d16f5770 PO	253	/*
	254	* Test if the card supports high-speed mode and, if so, switch to it.
	255	*/
7310ece8	256	static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
d16f5770 PO	257	{
	258	int ret;
	259	u8 speed;
	260
	261	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
	262	return 0;
	263
	264	if (!card->cccr.high_speed)
	265	return 0;
	266
	267	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
	268	if (ret)
	269	return ret;
	270
7310ece8 MM	271	if (enable)
	272	speed \|= SDIO_SPEED_EHS;
	273	else
	274	speed &= ~SDIO_SPEED_EHS;
d16f5770 PO	275
	276	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
	277	if (ret)
	278	return ret;
	279
71578a1e MM	280	return 1;
71578a1e MM	281	}
d16f5770	282
7310ece8 MM	283	/*
	284	* Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
	285	*/
	286	static int sdio_enable_hs(struct mmc_card *card)
	287	{
	288	int ret;
	289
	290	ret = mmc_sdio_switch_hs(card, true);
	291	if (ret <= 0 \|\| card->type == MMC_TYPE_SDIO)
	292	return ret;
	293
	294	ret = mmc_sd_switch_hs(card);
	295	if (ret <= 0)
	296	mmc_sdio_switch_hs(card, false);
	297
	298	return ret;
	299	}
	300
71578a1e MM	301	static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
	302	{
	303	unsigned max_dtr;
	304
	305	if (mmc_card_highspeed(card)) {
	306	/*
	307	* The SDIO specification doesn't mention how
	308	* the CIS transfer speed register relates to
	309	* high-speed, but it seems that 50 MHz is
	310	* mandatory.
	311	*/
	312	max_dtr = 50000000;
	313	} else {
	314	max_dtr = card->cis.max_dtr;
	315	}
	316
7310ece8 MM	317	if (card->type == MMC_TYPE_SD_COMBO)
	318	max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
	319
71578a1e	320	return max_dtr;
d16f5770 PO	321	}
d16f5770 PO	322
17d33e14 NP	323	/*
	324	* Handle the detection and initialisation of a card.
	325	*
	326	* In the case of a resume, "oldcard" will contain the card
	327	* we're trying to reinitialise.
	328	*/
	329	static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
3bca4cf7	330	struct mmc_card *oldcard, int powered_resume)
17d33e14 NP	331	{
	332	struct mmc_card *card;
	333	int err;
	334
	335	BUG_ON(!host);
	336	WARN_ON(!host->claimed);
	337
	338	/*
	339	* Inform the card of the voltage
	340	*/
3bca4cf7 CB	341	if (!powered_resume) {
	342	err = mmc_send_io_op_cond(host, host->ocr, &ocr);
	343	if (err)
	344	goto err;
	345	}
17d33e14 NP	346
	347	/*
	348	* For SPI, enable CRC as appropriate.
	349	*/
	350	if (mmc_host_is_spi(host)) {
	351	err = mmc_spi_set_crc(host, use_spi_crc);
	352	if (err)
	353	goto err;
	354	}
	355
	356	/*
	357	* Allocate card structure.
	358	*/
	359	card = mmc_alloc_card(host, NULL);
	360	if (IS_ERR(card)) {
	361	err = PTR_ERR(card);
	362	goto err;
	363	}
	364
f3c65b28 DV	365	if (ocr & R4_MEMORY_PRESENT
f3c65b28 DV	366	&& mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid) == 0) {
7310ece8 MM	367	card->type = MMC_TYPE_SD_COMBO;
	368
	369	if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO \|\|
	370	memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
	371	mmc_remove_card(card);
	372	return -ENOENT;
	373	}
	374	} else {
	375	card->type = MMC_TYPE_SDIO;
	376
	377	if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
	378	mmc_remove_card(card);
	379	return -ENOENT;
	380	}
	381	}
17d33e14	382
3fcb027d DM	383	/*
	384	* Call the optional HC's init_card function to handle quirks.
	385	*/
	386	if (host->ops->init_card)
	387	host->ops->init_card(host, card);
	388
17d33e14 NP	389	/*
	390	* For native busses: set card RCA and quit open drain mode.
	391	*/
3bca4cf7	392	if (!powered_resume && !mmc_host_is_spi(host)) {
17d33e14 NP	393	err = mmc_send_relative_addr(host, &card->rca);
	394	if (err)
	395	goto remove;
	396
	397	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	398	}
	399
7310ece8 MM	400	/*
	401	* Read CSD, before selecting the card
	402	*/
	403	if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
	404	err = mmc_sd_get_csd(host, card);
	405	if (err)
	406	return err;
	407
	408	mmc_decode_cid(card);
	409	}
	410
17d33e14 NP	411	/*
	412	* Select card, as all following commands rely on that.
	413	*/
3bca4cf7	414	if (!powered_resume && !mmc_host_is_spi(host)) {
17d33e14 NP	415	err = mmc_select_card(card);
	416	if (err)
	417	goto remove;
	418	}
	419
6f51be3d GI	420	if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
	421	/*
	422	* This is non-standard SDIO device, meaning it doesn't
	423	* have any CIA (Common I/O area) registers present.
	424	* It's host's responsibility to fill cccr and cis
	425	* structures in init_card().
	426	*/
	427	mmc_set_clock(host, card->cis.max_dtr);
	428
	429	if (card->cccr.high_speed) {
	430	mmc_card_set_highspeed(card);
	431	mmc_set_timing(card->host, MMC_TIMING_SD_HS);
	432	}
	433
	434	goto finish;
	435	}
	436
17d33e14 NP	437	/*
	438	* Read the common registers.
	439	*/
	440	err = sdio_read_cccr(card);
	441	if (err)
	442	goto remove;
	443
	444	/*
	445	* Read the common CIS tuples.
	446	*/
	447	err = sdio_read_common_cis(card);
	448	if (err)
	449	goto remove;
	450
	451	if (oldcard) {
	452	int same = (card->cis.vendor == oldcard->cis.vendor &&
	453	card->cis.device == oldcard->cis.device);
	454	mmc_remove_card(card);
7310ece8 MM	455	if (!same)
	456	return -ENOENT;
	457
17d33e14	458	card = oldcard;
95cdfb72	459	return 0;
17d33e14 NP	460	}
17d33e14 NP	461
7310ece8 MM	462	if (card->type == MMC_TYPE_SD_COMBO) {
	463	err = mmc_sd_setup_card(host, card, oldcard != NULL);
	464	/* handle as SDIO-only card if memory init failed */
	465	if (err) {
	466	mmc_go_idle(host);
	467	if (mmc_host_is_spi(host))
	468	/* should not fail, as it worked previously */
	469	mmc_spi_set_crc(host, use_spi_crc);
	470	card->type = MMC_TYPE_SDIO;
	471	} else
	472	card->dev.type = &sd_type;
	473	}
	474
	475	/*
	476	* If needed, disconnect card detection pull-up resistor.
	477	*/
	478	err = sdio_disable_cd(card);
	479	if (err)
	480	goto remove;
	481
17d33e14 NP	482	/*
	483	* Switch to high-speed (if supported).
	484	*/
	485	err = sdio_enable_hs(card);
71578a1e MM	486	if (err > 0)
	487	mmc_sd_go_highspeed(card);
	488	else if (err)
17d33e14 NP	489	goto remove;
	490
	491	/*
	492	* Change to the card's maximum speed.
	493	*/
71578a1e	494	mmc_set_clock(host, mmc_sdio_get_max_clock(card));
17d33e14 NP	495
	496	/*
	497	* Switch to wider bus (if supported).
	498	*/
7310ece8 MM	499	err = sdio_enable_4bit_bus(card);
	500	if (err > 0)
	501	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	502	else if (err)
17d33e14 NP	503	goto remove;
17d33e14 NP	504
6f51be3d	505	finish:
17d33e14 NP	506	if (!oldcard)
	507	host->card = card;
	508	return 0;
	509
	510	remove:
	511	if (!oldcard)
	512	mmc_remove_card(card);
	513
	514	err:
	515	return err;
	516	}
	517
5c4e6f13 PO	518	/*
	519	* Host is being removed. Free up the current card.
	520	*/
	521	static void mmc_sdio_remove(struct mmc_host *host)
	522	{
e29a7d73 PO	523	int i;
e29a7d73 PO	524
5c4e6f13 PO	525	BUG_ON(!host);
	526	BUG_ON(!host->card);
	527
e29a7d73 PO	528	for (i = 0;i < host->card->sdio_funcs;i++) {
	529	if (host->card->sdio_func[i]) {
	530	sdio_remove_func(host->card->sdio_func[i]);
	531	host->card->sdio_func[i] = NULL;
	532	}
	533	}
	534
5c4e6f13 PO	535	mmc_remove_card(host->card);
	536	host->card = NULL;
	537	}
	538
	539	/*
	540	* Card detection callback from host.
	541	*/
	542	static void mmc_sdio_detect(struct mmc_host *host)
	543	{
	544	int err;
	545
	546	BUG_ON(!host);
	547	BUG_ON(!host->card);
	548
	549	mmc_claim_host(host);
	550
	551	/*
	552	* Just check if our card has been removed.
	553	*/
	554	err = mmc_select_card(host->card);
	555
	556	mmc_release_host(host);
	557
	558	if (err) {
	559	mmc_sdio_remove(host);
	560
	561	mmc_claim_host(host);
	562	mmc_detach_bus(host);
	563	mmc_release_host(host);
	564	}
	565	}
	566
17d33e14 NP	567	/*
	568	* SDIO suspend. We need to suspend all functions separately.
	569	* Therefore all registered functions must have drivers with suspend
	570	* and resume methods. Failing that we simply remove the whole card.
	571	*/
95cdfb72	572	static int mmc_sdio_suspend(struct mmc_host *host)
17d33e14	573	{
95cdfb72	574	int i, err = 0;
17d33e14	575
17d33e14 NP	576	for (i = 0; i < host->card->sdio_funcs; i++) {
	577	struct sdio_func *func = host->card->sdio_func[i];
	578	if (func && sdio_func_present(func) && func->dev.driver) {
	579	const struct dev_pm_ops *pmops = func->dev.driver->pm;
	580	if (!pmops \|\| !pmops->suspend \|\| !pmops->resume) {
95cdfb72 NP	581	/* force removal of entire card in that case */
	582	err = -ENOSYS;
	583	} else
	584	err = pmops->suspend(&func->dev);
	585	if (err)
	586	break;
17d33e14 NP	587	}
17d33e14 NP	588	}
95cdfb72	589	while (err && --i >= 0) {
17d33e14 NP	590	struct sdio_func *func = host->card->sdio_func[i];
	591	if (func && sdio_func_present(func) && func->dev.driver) {
	592	const struct dev_pm_ops *pmops = func->dev.driver->pm;
95cdfb72	593	pmops->resume(&func->dev);
17d33e14 NP	594	}
17d33e14 NP	595	}
95cdfb72	596
6b5eda36 DD	597	if (!err && host->pm_flags & MMC_PM_KEEP_POWER) {
	598	mmc_claim_host(host);
	599	sdio_disable_wide(host->card);
	600	mmc_release_host(host);
	601	}
	602
95cdfb72	603	return err;
17d33e14 NP	604	}
17d33e14 NP	605
95cdfb72	606	static int mmc_sdio_resume(struct mmc_host *host)
17d33e14 NP	607	{
	608	int i, err;
	609
	610	BUG_ON(!host);
	611	BUG_ON(!host->card);
	612
95cdfb72	613	/* Basic card reinitialization. */
17d33e14	614	mmc_claim_host(host);
3bca4cf7 CB	615	err = mmc_sdio_init_card(host, host->ocr, host->card,
3bca4cf7 CB	616	(host->pm_flags & MMC_PM_KEEP_POWER));
7310ece8	617	if (!err) {
6b5eda36	618	/* We may have switched to 1-bit mode during suspend. */
7310ece8 MM	619	err = sdio_enable_4bit_bus(host->card);
	620	if (err > 0) {
	621	mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
	622	err = 0;
	623	}
	624	}
40216842 NP	625	if (!err && host->sdio_irqs)
40216842 NP	626	mmc_signal_sdio_irq(host);
17d33e14	627	mmc_release_host(host);
17d33e14	628
95cdfb72 NP	629	/*
	630	* If the card looked to be the same as before suspending, then
	631	* we proceed to resume all card functions. If one of them returns
	632	* an error then we simply return that error to the core and the
	633	* card will be redetected as new. It is the responsibility of
	634	* the function driver to perform further tests with the extra
	635	* knowledge it has of the card to confirm the card is indeed the
	636	* same as before suspending (same MAC address for network cards,
	637	* etc.) and return an error otherwise.
	638	*/
	639	for (i = 0; !err && i < host->card->sdio_funcs; i++) {
17d33e14 NP	640	struct sdio_func *func = host->card->sdio_func[i];
	641	if (func && sdio_func_present(func) && func->dev.driver) {
	642	const struct dev_pm_ops *pmops = func->dev.driver->pm;
95cdfb72	643	err = pmops->resume(&func->dev);
17d33e14 NP	644	}
17d33e14 NP	645	}
95cdfb72 NP	646
95cdfb72 NP	647	return err;
17d33e14	648	}
5c4e6f13 PO	649
	650	static const struct mmc_bus_ops mmc_sdio_ops = {
	651	.remove = mmc_sdio_remove,
	652	.detect = mmc_sdio_detect,
17d33e14 NP	653	.suspend = mmc_sdio_suspend,
17d33e14 NP	654	.resume = mmc_sdio_resume,
5c4e6f13 PO	655	};
	656
	657
	658	/*
	659	* Starting point for SDIO card init.
	660	*/
	661	int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
	662	{
	663	int err;
e29a7d73	664	int i, funcs;
5c4e6f13 PO	665	struct mmc_card *card;
	666
	667	BUG_ON(!host);
d84075c8	668	WARN_ON(!host->claimed);
5c4e6f13 PO	669
	670	mmc_attach_bus(host, &mmc_sdio_ops);
	671
	672	/*
	673	* Sanity check the voltages that the card claims to
	674	* support.
	675	*/
	676	if (ocr & 0x7F) {
	677	printk(KERN_WARNING "%s: card claims to support voltages "
	678	"below the defined range. These will be ignored.\n",
	679	mmc_hostname(host));
	680	ocr &= ~0x7F;
	681	}
	682
5c4e6f13 PO	683	host->ocr = mmc_select_voltage(host, ocr);
	684
	685	/*
	686	* Can we support the voltage(s) of the card(s)?
	687	*/
	688	if (!host->ocr) {
	689	err = -EINVAL;
	690	goto err;
	691	}
	692
	693	/*
17d33e14	694	* Detect and init the card.
5c4e6f13	695	*/
3bca4cf7	696	err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
5c4e6f13 PO	697	if (err)
5c4e6f13 PO	698	goto err;
17d33e14	699	card = host->card;
af517150	700
5c4e6f13 PO	701	/*
	702	* The number of functions on the card is encoded inside
	703	* the ocr.
	704	*/
e8812793 MF	705	funcs = (ocr & 0x70000000) >> 28;
e8812793 MF	706	card->sdio_funcs = 0;
4ff6471c	707
e29a7d73 PO	708	/*
	709	* Initialize (but don't add) all present functions.
	710	*/
e8812793	711	for (i = 0; i < funcs; i++, card->sdio_funcs++) {
e29a7d73 PO	712	err = sdio_init_func(host->card, i + 1);
	713	if (err)
	714	goto remove;
	715	}
5c4e6f13 PO	716
	717	mmc_release_host(host);
	718
e29a7d73 PO	719	/*
	720	* First add the card to the driver model...
	721	*/
5c4e6f13 PO	722	err = mmc_add_card(host->card);
5c4e6f13 PO	723	if (err)
e29a7d73 PO	724	goto remove_added;
	725
	726	/*
	727	* ...then the SDIO functions.
	728	*/
	729	for (i = 0;i < funcs;i++) {
	730	err = sdio_add_func(host->card->sdio_func[i]);
	731	if (err)
	732	goto remove_added;
	733	}
5c4e6f13 PO	734
	735	return 0;
	736
e29a7d73 PO	737
	738	remove_added:
	739	/* Remove without lock if the device has been added. */
	740	mmc_sdio_remove(host);
5c4e6f13	741	mmc_claim_host(host);
e29a7d73 PO	742	remove:
	743	/* And with lock if it hasn't been added. */
	744	if (host->card)
	745	mmc_sdio_remove(host);
5c4e6f13 PO	746	err:
	747	mmc_detach_bus(host);
	748	mmc_release_host(host);
	749
	750	printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
	751	mmc_hostname(host), err);
	752
	753	return err;
	754	}
	755