[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 "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;

	ret = sdio_read_fbr(func);
	if (ret)
		goto fail;

	ret = sdio_read_func_cis(func);
	if (ret)
		goto fail;

	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;

	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);

	return 0;
}

/*
 * 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);
}

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

	speed |= SDIO_SPEED_EHS;

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

	mmc_card_set_highspeed(card);
	mmc_set_timing(card->host, MMC_TIMING_SD_HS);

	return 0;
}

/*
 * 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)
{
	struct mmc_card *card;
	int err;

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

	/*
	 * Inform the card of the voltage
	 */
	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;
	}

	card->type = MMC_TYPE_SDIO;

	/*
	 * For native busses:  set card RCA and quit open drain mode.
	 */
	if (!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);
	}

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

	/*
	 * 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) {
			err = -ENOENT;
			goto err;
		}
		card = oldcard;
		return 0;
	}

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

	/*
	 * Change to the card's maximum speed.
	 */
	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.
		 */
		mmc_set_clock(host, 50000000);
	} else {
		mmc_set_clock(host, card->cis.max_dtr);
	}

	/*
	 * Switch to wider bus (if supported).
	 */
	err = sdio_enable_wide(card);
	if (err)
		goto remove;

	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);
		}
	}

	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);
	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);
	if (err)
		goto err;
	card = host->card;

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

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

	/*
	 * Initialize (but don't add) all present functions.
	 */
	for (i = 0;i < funcs;i++) {
		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"
e29a7d73	21	#include "sdio_bus.h"
5c4e6f13 PO	22	#include "mmc_ops.h"
	23	#include "sd_ops.h"
	24	#include "sdio_ops.h"
b7261261	25	#include "sdio_cis.h"
5c4e6f13	26
0597007f PO	27	static int sdio_read_fbr(struct sdio_func *func)
	28	{
	29	int ret;
	30	unsigned char data;
	31
	32	ret = mmc_io_rw_direct(func->card, 0, 0,
7616ee95	33	SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
0597007f PO	34	if (ret)
	35	goto out;
	36
	37	data &= 0x0f;
	38
	39	if (data == 0x0f) {
	40	ret = mmc_io_rw_direct(func->card, 0, 0,
7616ee95	41	SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
0597007f PO	42	if (ret)
	43	goto out;
	44	}
	45
	46	func->class = data;
	47
	48	out:
	49	return ret;
	50	}
	51
e29a7d73 PO	52	static int sdio_init_func(struct mmc_card *card, unsigned int fn)
e29a7d73 PO	53	{
0597007f	54	int ret;
e29a7d73 PO	55	struct sdio_func *func;
	56
	57	BUG_ON(fn > SDIO_MAX_FUNCS);
	58
	59	func = sdio_alloc_func(card);
	60	if (IS_ERR(func))
	61	return PTR_ERR(func);
	62
	63	func->num = fn;
	64
0597007f PO	65	ret = sdio_read_fbr(func);
	66	if (ret)
	67	goto fail;
	68
1a632f8c	69	ret = sdio_read_func_cis(func);
b7261261 NP	70	if (ret)
	71	goto fail;
	72
e29a7d73 PO	73	card->sdio_func[fn - 1] = func;
	74
	75	return 0;
0597007f PO	76
	77	fail:
	78	/*
	79	* It is okay to remove the function here even though we hold
	80	* the host lock as we haven't registered the device yet.
	81	*/
	82	sdio_remove_func(func);
	83	return ret;
e29a7d73 PO	84	}
e29a7d73 PO	85
35c66c19 PO	86	static int sdio_read_cccr(struct mmc_card *card)
	87	{
	88	int ret;
	89	int cccr_vsn;
	90	unsigned char data;
	91
	92	memset(&card->cccr, 0, sizeof(struct sdio_cccr));
	93
	94	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
	95	if (ret)
	96	goto out;
	97
	98	cccr_vsn = data & 0x0f;
	99
	100	if (cccr_vsn > SDIO_CCCR_REV_1_20) {
	101	printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
	102	mmc_hostname(card->host), cccr_vsn);
	103	return -EINVAL;
	104	}
	105
	106	card->cccr.sdio_vsn = (data & 0xf0) >> 4;
	107
	108	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
	109	if (ret)
	110	goto out;
	111
	112	if (data & SDIO_CCCR_CAP_SMB)
	113	card->cccr.multi_block = 1;
	114	if (data & SDIO_CCCR_CAP_LSC)
	115	card->cccr.low_speed = 1;
	116	if (data & SDIO_CCCR_CAP_4BLS)
	117	card->cccr.wide_bus = 1;
	118
	119	if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
	120	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
	121	if (ret)
	122	goto out;
	123
	124	if (data & SDIO_POWER_SMPC)
	125	card->cccr.high_power = 1;
	126	}
	127
	128	if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
	129	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
	130	if (ret)
	131	goto out;
	132
	133	if (data & SDIO_SPEED_SHS)
	134	card->cccr.high_speed = 1;
	135	}
	136
	137	out:
	138	return ret;
	139	}
	140
4ff6471c PO	141	static int sdio_enable_wide(struct mmc_card *card)
	142	{
	143	int ret;
	144	u8 ctrl;
	145
	146	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
	147	return 0;
	148
	149	if (card->cccr.low_speed && !card->cccr.wide_bus)
	150	return 0;
	151
	152	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
	153	if (ret)
	154	return ret;
	155
	156	ctrl \|= SDIO_BUS_WIDTH_4BIT;
	157
	158	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
	159	if (ret)
	160	return ret;
	161
	162	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
	163
	164	return 0;
	165	}
	166
006ebd5d OBC	167	/*
	168	* If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
	169	* of the card. This may be required on certain setups of boards,
	170	* controllers and embedded sdio device which do not need the card's
	171	* pull-up. As a result, card detection is disabled and power is saved.
	172	*/
	173	static int sdio_disable_cd(struct mmc_card *card)
	174	{
	175	int ret;
	176	u8 ctrl;
	177
	178	if (!card->cccr.disable_cd)
	179	return 0;
	180
	181	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
	182	if (ret)
	183	return ret;
	184
	185	ctrl \|= SDIO_BUS_CD_DISABLE;
	186
	187	return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
	188	}
	189
d16f5770 PO	190	/*
	191	* Test if the card supports high-speed mode and, if so, switch to it.
	192	*/
	193	static int sdio_enable_hs(struct mmc_card *card)
	194	{
	195	int ret;
	196	u8 speed;
	197
	198	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
	199	return 0;
	200
	201	if (!card->cccr.high_speed)
	202	return 0;
	203
	204	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
	205	if (ret)
	206	return ret;
	207
	208	speed \|= SDIO_SPEED_EHS;
	209
	210	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
	211	if (ret)
	212	return ret;
	213
	214	mmc_card_set_highspeed(card);
	215	mmc_set_timing(card->host, MMC_TIMING_SD_HS);
	216
	217	return 0;
	218	}
	219
17d33e14 NP	220	/*
	221	* Handle the detection and initialisation of a card.
	222	*
	223	* In the case of a resume, "oldcard" will contain the card
	224	* we're trying to reinitialise.
	225	*/
	226	static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
	227	struct mmc_card *oldcard)
	228	{
	229	struct mmc_card *card;
	230	int err;
	231
	232	BUG_ON(!host);
	233	WARN_ON(!host->claimed);
	234
	235	/*
	236	* Inform the card of the voltage
	237	*/
	238	err = mmc_send_io_op_cond(host, host->ocr, &ocr);
	239	if (err)
	240	goto err;
	241
	242	/*
	243	* For SPI, enable CRC as appropriate.
	244	*/
	245	if (mmc_host_is_spi(host)) {
	246	err = mmc_spi_set_crc(host, use_spi_crc);
	247	if (err)
	248	goto err;
	249	}
	250
	251	/*
	252	* Allocate card structure.
	253	*/
	254	card = mmc_alloc_card(host, NULL);
	255	if (IS_ERR(card)) {
	256	err = PTR_ERR(card);
	257	goto err;
	258	}
	259
	260	card->type = MMC_TYPE_SDIO;
	261
	262	/*
	263	* For native busses: set card RCA and quit open drain mode.
	264	*/
	265	if (!mmc_host_is_spi(host)) {
	266	err = mmc_send_relative_addr(host, &card->rca);
	267	if (err)
	268	goto remove;
	269
	270	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	271	}
	272
	273	/*
	274	* Select card, as all following commands rely on that.
	275	*/
	276	if (!mmc_host_is_spi(host)) {
	277	err = mmc_select_card(card);
	278	if (err)
	279	goto remove;
	280	}
	281
	282	/*
	283	* Read the common registers.
284	*/
285	err = sdio_read_cccr(card);
286	if (err)
287	goto remove;
288
289	/*
290	* Read the common CIS tuples.
291	*/
292	err = sdio_read_common_cis(card);
293	if (err)
294	goto remove;
295
296	if (oldcard) {
297	int same = (card->cis.vendor == oldcard->cis.vendor &&
298	card->cis.device == oldcard->cis.device);
299	mmc_remove_card(card);
300	if (!same) {
301	err = -ENOENT;
302	goto err;
303	}
304	card = oldcard;
95cdfb72	305	return 0;
17d33e14 NP	306	}
	307
	308	/*
	309	* Switch to high-speed (if supported).
	310	*/
	311	err = sdio_enable_hs(card);
	312	if (err)
	313	goto remove;
	314
	315	/*
	316	* Change to the card's maximum speed.
	317	*/
	318	if (mmc_card_highspeed(card)) {
	319	/*
	320	* The SDIO specification doesn't mention how
	321	* the CIS transfer speed register relates to
	322	* high-speed, but it seems that 50 MHz is
	323	* mandatory.
	324	*/
	325	mmc_set_clock(host, 50000000);
	326	} else {
	327	mmc_set_clock(host, card->cis.max_dtr);
	328	}
	329
	330	/*
	331	* Switch to wider bus (if supported).
	332	*/
	333	err = sdio_enable_wide(card);
	334	if (err)
	335	goto remove;
	336
	337	if (!oldcard)
	338	host->card = card;
	339	return 0;
	340
	341	remove:
	342	if (!oldcard)
	343	mmc_remove_card(card);
	344
	345	err:
	346	return err;
	347	}
	348
5c4e6f13 PO	349	/*
	350	* Host is being removed. Free up the current card.
	351	*/
	352	static void mmc_sdio_remove(struct mmc_host *host)
	353	{
e29a7d73 PO	354	int i;
e29a7d73 PO	355
5c4e6f13 PO	356	BUG_ON(!host);
	357	BUG_ON(!host->card);
	358
e29a7d73 PO	359	for (i = 0;i < host->card->sdio_funcs;i++) {
	360	if (host->card->sdio_func[i]) {
	361	sdio_remove_func(host->card->sdio_func[i]);
	362	host->card->sdio_func[i] = NULL;
	363	}
	364	}
	365
5c4e6f13 PO	366	mmc_remove_card(host->card);
	367	host->card = NULL;
	368	}
	369
	370	/*
	371	* Card detection callback from host.
	372	*/
	373	static void mmc_sdio_detect(struct mmc_host *host)
	374	{
	375	int err;
	376
	377	BUG_ON(!host);
	378	BUG_ON(!host->card);
	379
	380	mmc_claim_host(host);
	381
	382	/*
	383	* Just check if our card has been removed.
	384	*/
	385	err = mmc_select_card(host->card);
	386
	387	mmc_release_host(host);
	388
	389	if (err) {
	390	mmc_sdio_remove(host);
	391
	392	mmc_claim_host(host);
	393	mmc_detach_bus(host);
	394	mmc_release_host(host);
	395	}
	396	}
	397
17d33e14 NP	398	/*
	399	* SDIO suspend. We need to suspend all functions separately.
	400	* Therefore all registered functions must have drivers with suspend
	401	* and resume methods. Failing that we simply remove the whole card.
	402	*/
95cdfb72	403	static int mmc_sdio_suspend(struct mmc_host *host)
17d33e14	404	{
95cdfb72	405	int i, err = 0;
17d33e14	406
17d33e14 NP	407	for (i = 0; i < host->card->sdio_funcs; i++) {
	408	struct sdio_func *func = host->card->sdio_func[i];
	409	if (func && sdio_func_present(func) && func->dev.driver) {
	410	const struct dev_pm_ops *pmops = func->dev.driver->pm;
	411	if (!pmops \|\| !pmops->suspend \|\| !pmops->resume) {
95cdfb72 NP	412	/* force removal of entire card in that case */
	413	err = -ENOSYS;
	414	} else
	415	err = pmops->suspend(&func->dev);
	416	if (err)
	417	break;
17d33e14 NP	418	}
17d33e14 NP	419	}
95cdfb72	420	while (err && --i >= 0) {
17d33e14 NP	421	struct sdio_func *func = host->card->sdio_func[i];
	422	if (func && sdio_func_present(func) && func->dev.driver) {
	423	const struct dev_pm_ops *pmops = func->dev.driver->pm;
95cdfb72	424	pmops->resume(&func->dev);
17d33e14 NP	425	}
17d33e14 NP	426	}
95cdfb72 NP	427
95cdfb72 NP	428	return err;
17d33e14 NP	429	}
17d33e14 NP	430
95cdfb72	431	static int mmc_sdio_resume(struct mmc_host *host)
17d33e14 NP	432	{
	433	int i, err;
	434
	435	BUG_ON(!host);
	436	BUG_ON(!host->card);
	437
95cdfb72	438	/* Basic card reinitialization. */
17d33e14 NP	439	mmc_claim_host(host);
	440	err = mmc_sdio_init_card(host, host->ocr, host->card);
	441	mmc_release_host(host);
17d33e14	442
95cdfb72 NP	443	/*
	444	* If the card looked to be the same as before suspending, then
	445	* we proceed to resume all card functions. If one of them returns
	446	* an error then we simply return that error to the core and the
	447	* card will be redetected as new. It is the responsibility of
	448	* the function driver to perform further tests with the extra
	449	* knowledge it has of the card to confirm the card is indeed the
	450	* same as before suspending (same MAC address for network cards,
	451	* etc.) and return an error otherwise.
	452	*/
	453	for (i = 0; !err && i < host->card->sdio_funcs; i++) {
17d33e14 NP	454	struct sdio_func *func = host->card->sdio_func[i];
	455	if (func && sdio_func_present(func) && func->dev.driver) {
	456	const struct dev_pm_ops *pmops = func->dev.driver->pm;
95cdfb72	457	err = pmops->resume(&func->dev);
17d33e14 NP	458	}
17d33e14 NP	459	}
95cdfb72 NP	460
95cdfb72 NP	461	return err;
17d33e14	462	}
5c4e6f13 PO	463
	464	static const struct mmc_bus_ops mmc_sdio_ops = {
	465	.remove = mmc_sdio_remove,
	466	.detect = mmc_sdio_detect,
17d33e14 NP	467	.suspend = mmc_sdio_suspend,
17d33e14 NP	468	.resume = mmc_sdio_resume,
5c4e6f13 PO	469	};
	470
	471
	472	/*
	473	* Starting point for SDIO card init.
	474	*/
	475	int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
	476	{
	477	int err;
e29a7d73	478	int i, funcs;
5c4e6f13 PO	479	struct mmc_card *card;
	480
	481	BUG_ON(!host);
d84075c8	482	WARN_ON(!host->claimed);
5c4e6f13 PO	483
	484	mmc_attach_bus(host, &mmc_sdio_ops);
	485
	486	/*
	487	* Sanity check the voltages that the card claims to
	488	* support.
	489	*/
	490	if (ocr & 0x7F) {
	491	printk(KERN_WARNING "%s: card claims to support voltages "
	492	"below the defined range. These will be ignored.\n",
	493	mmc_hostname(host));
	494	ocr &= ~0x7F;
	495	}
	496
5c4e6f13 PO	497	host->ocr = mmc_select_voltage(host, ocr);
	498
	499	/*
	500	* Can we support the voltage(s) of the card(s)?
	501	*/
	502	if (!host->ocr) {
	503	err = -EINVAL;
	504	goto err;
	505	}
	506
	507	/*
17d33e14	508	* Detect and init the card.
5c4e6f13	509	*/
17d33e14	510	err = mmc_sdio_init_card(host, host->ocr, NULL);
5c4e6f13 PO	511	if (err)
5c4e6f13 PO	512	goto err;
17d33e14	513	card = host->card;
af517150	514
5c4e6f13 PO	515	/*
	516	* The number of functions on the card is encoded inside
	517	* the ocr.
	518	*/
17d33e14	519	card->sdio_funcs = funcs = (ocr & 0x70000000) >> 28;
4ff6471c	520
006ebd5d OBC	521	/*
	522	* If needed, disconnect card detection pull-up resistor.
	523	*/
	524	err = sdio_disable_cd(card);
	525	if (err)
	526	goto remove;
	527
e29a7d73 PO	528	/*
	529	* Initialize (but don't add) all present functions.
	530	*/
	531	for (i = 0;i < funcs;i++) {
	532	err = sdio_init_func(host->card, i + 1);
	533	if (err)
	534	goto remove;
	535	}
5c4e6f13 PO	536
	537	mmc_release_host(host);
	538
e29a7d73 PO	539	/*
	540	* First add the card to the driver model...
	541	*/
5c4e6f13 PO	542	err = mmc_add_card(host->card);
5c4e6f13 PO	543	if (err)
e29a7d73 PO	544	goto remove_added;
	545
	546	/*
	547	* ...then the SDIO functions.
	548	*/
	549	for (i = 0;i < funcs;i++) {
	550	err = sdio_add_func(host->card->sdio_func[i]);
	551	if (err)
	552	goto remove_added;
	553	}
5c4e6f13 PO	554
	555	return 0;
	556
e29a7d73 PO	557
	558	remove_added:
	559	/* Remove without lock if the device has been added. */
	560	mmc_sdio_remove(host);
5c4e6f13	561	mmc_claim_host(host);
e29a7d73 PO	562	remove:
	563	/* And with lock if it hasn't been added. */
	564	if (host->card)
	565	mmc_sdio_remove(host);
5c4e6f13 PO	566	err:
	567	mmc_detach_bus(host);
	568	mmc_release_host(host);
	569
	570	printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
	571	mmc_hostname(host), err);
	572
	573	return err;
	574	}
	575