[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, 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;
	}

	card->type = MMC_TYPE_SDIO;

	/*
	 * 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);
	}

	/*
	 * 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;
	}

	/*
	 * 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,
				 (host->pm_flags & MMC_PM_KEEP_POWER));
	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;

	/*
	 * 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++, 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"
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,
3bca4cf7	227	struct mmc_card *oldcard, int powered_resume)
17d33e14 NP	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	*/
3bca4cf7 CB	238	if (!powered_resume) {
	239	err = mmc_send_io_op_cond(host, host->ocr, &ocr);
	240	if (err)
	241	goto err;
	242	}
17d33e14 NP	243
	244	/*
	245	* For SPI, enable CRC as appropriate.
	246	*/
	247	if (mmc_host_is_spi(host)) {
	248	err = mmc_spi_set_crc(host, use_spi_crc);
	249	if (err)
	250	goto err;
	251	}
	252
	253	/*
	254	* Allocate card structure.
	255	*/
	256	card = mmc_alloc_card(host, NULL);
	257	if (IS_ERR(card)) {
	258	err = PTR_ERR(card);
	259	goto err;
	260	}
	261
	262	card->type = MMC_TYPE_SDIO;
	263
	264	/*
	265	* For native busses: set card RCA and quit open drain mode.
	266	*/
3bca4cf7	267	if (!powered_resume && !mmc_host_is_spi(host)) {
17d33e14 NP	268	err = mmc_send_relative_addr(host, &card->rca);
	269	if (err)
	270	goto remove;
	271
	272	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	273	}
	274
	275	/*
	276	* Select card, as all following commands rely on that.
	277	*/
3bca4cf7	278	if (!powered_resume && !mmc_host_is_spi(host)) {
17d33e14 NP	279	err = mmc_select_card(card);
	280	if (err)
	281	goto remove;
	282	}
	283
	284	/*
	285	* Read the common registers.
	286	*/
	287	err = sdio_read_cccr(card);
	288	if (err)
	289	goto remove;
	290
	291	/*
	292	* Read the common CIS tuples.
	293	*/
	294	err = sdio_read_common_cis(card);
	295	if (err)
	296	goto remove;
	297
	298	if (oldcard) {
	299	int same = (card->cis.vendor == oldcard->cis.vendor &&
	300	card->cis.device == oldcard->cis.device);
	301	mmc_remove_card(card);
	302	if (!same) {
	303	err = -ENOENT;
	304	goto err;
	305	}
	306	card = oldcard;
95cdfb72	307	return 0;
17d33e14 NP	308	}
	309
	310	/*
	311	* Switch to high-speed (if supported).
	312	*/
	313	err = sdio_enable_hs(card);
	314	if (err)
	315	goto remove;
	316
	317	/*
	318	* Change to the card's maximum speed.
	319	*/
	320	if (mmc_card_highspeed(card)) {
	321	/*
	322	* The SDIO specification doesn't mention how
	323	* the CIS transfer speed register relates to
	324	* high-speed, but it seems that 50 MHz is
	325	* mandatory.
	326	*/
	327	mmc_set_clock(host, 50000000);
	328	} else {
	329	mmc_set_clock(host, card->cis.max_dtr);
	330	}
	331
	332	/*
	333	* Switch to wider bus (if supported).
	334	*/
	335	err = sdio_enable_wide(card);
	336	if (err)
	337	goto remove;
	338
	339	if (!oldcard)
	340	host->card = card;
	341	return 0;
	342
	343	remove:
	344	if (!oldcard)
	345	mmc_remove_card(card);
	346
	347	err:
	348	return err;
	349	}
	350
5c4e6f13 PO	351	/*
	352	* Host is being removed. Free up the current card.
	353	*/
	354	static void mmc_sdio_remove(struct mmc_host *host)
	355	{
e29a7d73 PO	356	int i;
e29a7d73 PO	357
5c4e6f13 PO	358	BUG_ON(!host);
	359	BUG_ON(!host->card);
	360
e29a7d73 PO	361	for (i = 0;i < host->card->sdio_funcs;i++) {
	362	if (host->card->sdio_func[i]) {
	363	sdio_remove_func(host->card->sdio_func[i]);
	364	host->card->sdio_func[i] = NULL;
	365	}
	366	}
	367
5c4e6f13 PO	368	mmc_remove_card(host->card);
	369	host->card = NULL;
	370	}
	371
	372	/*
	373	* Card detection callback from host.
	374	*/
	375	static void mmc_sdio_detect(struct mmc_host *host)
	376	{
	377	int err;
	378
	379	BUG_ON(!host);
	380	BUG_ON(!host->card);
	381
	382	mmc_claim_host(host);
	383
	384	/*
	385	* Just check if our card has been removed.
	386	*/
	387	err = mmc_select_card(host->card);
	388
	389	mmc_release_host(host);
	390
	391	if (err) {
	392	mmc_sdio_remove(host);
	393
	394	mmc_claim_host(host);
	395	mmc_detach_bus(host);
	396	mmc_release_host(host);
	397	}
	398	}
	399
17d33e14 NP	400	/*
	401	* SDIO suspend. We need to suspend all functions separately.
	402	* Therefore all registered functions must have drivers with suspend
	403	* and resume methods. Failing that we simply remove the whole card.
	404	*/
95cdfb72	405	static int mmc_sdio_suspend(struct mmc_host *host)
17d33e14	406	{
95cdfb72	407	int i, err = 0;
17d33e14	408
17d33e14 NP	409	for (i = 0; i < host->card->sdio_funcs; i++) {
	410	struct sdio_func *func = host->card->sdio_func[i];
	411	if (func && sdio_func_present(func) && func->dev.driver) {
	412	const struct dev_pm_ops *pmops = func->dev.driver->pm;
	413	if (!pmops \|\| !pmops->suspend \|\| !pmops->resume) {
95cdfb72 NP	414	/* force removal of entire card in that case */
	415	err = -ENOSYS;
	416	} else
	417	err = pmops->suspend(&func->dev);
	418	if (err)
	419	break;
17d33e14 NP	420	}
17d33e14 NP	421	}
95cdfb72	422	while (err && --i >= 0) {
17d33e14 NP	423	struct sdio_func *func = host->card->sdio_func[i];
	424	if (func && sdio_func_present(func) && func->dev.driver) {
	425	const struct dev_pm_ops *pmops = func->dev.driver->pm;
95cdfb72	426	pmops->resume(&func->dev);
17d33e14 NP	427	}
17d33e14 NP	428	}
95cdfb72 NP	429
95cdfb72 NP	430	return err;
17d33e14 NP	431	}
17d33e14 NP	432
95cdfb72	433	static int mmc_sdio_resume(struct mmc_host *host)
17d33e14 NP	434	{
	435	int i, err;
	436
	437	BUG_ON(!host);
	438	BUG_ON(!host->card);
	439
95cdfb72	440	/* Basic card reinitialization. */
17d33e14	441	mmc_claim_host(host);
3bca4cf7 CB	442	err = mmc_sdio_init_card(host, host->ocr, host->card,
3bca4cf7 CB	443	(host->pm_flags & MMC_PM_KEEP_POWER));
40216842 NP	444	if (!err && host->sdio_irqs)
40216842 NP	445	mmc_signal_sdio_irq(host);
17d33e14	446	mmc_release_host(host);
17d33e14	447
95cdfb72 NP	448	/*
	449	* If the card looked to be the same as before suspending, then
	450	* we proceed to resume all card functions. If one of them returns
	451	* an error then we simply return that error to the core and the
	452	* card will be redetected as new. It is the responsibility of
	453	* the function driver to perform further tests with the extra
	454	* knowledge it has of the card to confirm the card is indeed the
	455	* same as before suspending (same MAC address for network cards,
	456	* etc.) and return an error otherwise.
	457	*/
	458	for (i = 0; !err && i < host->card->sdio_funcs; i++) {
17d33e14 NP	459	struct sdio_func *func = host->card->sdio_func[i];
	460	if (func && sdio_func_present(func) && func->dev.driver) {
	461	const struct dev_pm_ops *pmops = func->dev.driver->pm;
95cdfb72	462	err = pmops->resume(&func->dev);
17d33e14 NP	463	}
17d33e14 NP	464	}
95cdfb72 NP	465
95cdfb72 NP	466	return err;
17d33e14	467	}
5c4e6f13 PO	468
	469	static const struct mmc_bus_ops mmc_sdio_ops = {
	470	.remove = mmc_sdio_remove,
	471	.detect = mmc_sdio_detect,
17d33e14 NP	472	.suspend = mmc_sdio_suspend,
17d33e14 NP	473	.resume = mmc_sdio_resume,
5c4e6f13 PO	474	};
	475
	476
	477	/*
	478	* Starting point for SDIO card init.
	479	*/
	480	int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
	481	{
	482	int err;
e29a7d73	483	int i, funcs;
5c4e6f13 PO	484	struct mmc_card *card;
	485
	486	BUG_ON(!host);
d84075c8	487	WARN_ON(!host->claimed);
5c4e6f13 PO	488
	489	mmc_attach_bus(host, &mmc_sdio_ops);
	490
	491	/*
	492	* Sanity check the voltages that the card claims to
	493	* support.
	494	*/
	495	if (ocr & 0x7F) {
	496	printk(KERN_WARNING "%s: card claims to support voltages "
	497	"below the defined range. These will be ignored.\n",
	498	mmc_hostname(host));
	499	ocr &= ~0x7F;
	500	}
	501
5c4e6f13 PO	502	host->ocr = mmc_select_voltage(host, ocr);
	503
	504	/*
	505	* Can we support the voltage(s) of the card(s)?
	506	*/
	507	if (!host->ocr) {
	508	err = -EINVAL;
	509	goto err;
	510	}
	511
	512	/*
17d33e14	513	* Detect and init the card.
5c4e6f13	514	*/
3bca4cf7	515	err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
5c4e6f13 PO	516	if (err)
5c4e6f13 PO	517	goto err;
17d33e14	518	card = host->card;
af517150	519
5c4e6f13 PO	520	/*
	521	* The number of functions on the card is encoded inside
	522	* the ocr.
	523	*/
e8812793 MF	524	funcs = (ocr & 0x70000000) >> 28;
e8812793 MF	525	card->sdio_funcs = 0;
4ff6471c	526
006ebd5d OBC	527	/*
	528	* If needed, disconnect card detection pull-up resistor.
	529	*/
	530	err = sdio_disable_cd(card);
	531	if (err)
	532	goto remove;
	533
e29a7d73 PO	534	/*
	535	* Initialize (but don't add) all present functions.
	536	*/
e8812793	537	for (i = 0; i < funcs; i++, card->sdio_funcs++) {
e29a7d73 PO	538	err = sdio_init_func(host->card, i + 1);
	539	if (err)
	540	goto remove;
	541	}
5c4e6f13 PO	542
	543	mmc_release_host(host);
	544
e29a7d73 PO	545	/*
	546	* First add the card to the driver model...
	547	*/
5c4e6f13 PO	548	err = mmc_add_card(host->card);
5c4e6f13 PO	549	if (err)
e29a7d73 PO	550	goto remove_added;
	551
	552	/*
	553	* ...then the SDIO functions.
	554	*/
	555	for (i = 0;i < funcs;i++) {
	556	err = sdio_add_func(host->card->sdio_func[i]);
	557	if (err)
	558	goto remove_added;
	559	}
5c4e6f13 PO	560
	561	return 0;
	562
e29a7d73 PO	563
	564	remove_added:
	565	/* Remove without lock if the device has been added. */
	566	mmc_sdio_remove(host);
5c4e6f13	567	mmc_claim_host(host);
e29a7d73 PO	568	remove:
	569	/* And with lock if it hasn't been added. */
	570	if (host->card)
	571	mmc_sdio_remove(host);
5c4e6f13 PO	572	err:
	573	mmc_detach_bus(host);
	574	mmc_release_host(host);
	575
	576	printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
	577	mmc_hostname(host), err);
	578
	579	return err;
	580	}
	581