[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;
}

/*
 * 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);
	}
}


static const struct mmc_bus_ops mmc_sdio_ops = {
	.remove = mmc_sdio_remove,
	.detect = mmc_sdio_detect,
};


/*
 * 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);
	BUG_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;
	}

	if (ocr & MMC_VDD_165_195) {
		printk(KERN_WARNING "%s: SDIO 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;
	}

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

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

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

	card->type = MMC_TYPE_SDIO;
	card->sdio_funcs = funcs;

	host->card = card;

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

	/*
	 * No support for high-speed yet, so just set
	 * the card's maximum speed.
	 */
	mmc_set_clock(host, card->cis.max_dtr);

	/*
	 * Switch to wider bus (if supported).
	 */
	err = sdio_enable_wide(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
5c4e6f13 PO	167	/*
	168	* Host is being removed. Free up the current card.
	169	*/
	170	static void mmc_sdio_remove(struct mmc_host *host)
	171	{
e29a7d73 PO	172	int i;
e29a7d73 PO	173
5c4e6f13 PO	174	BUG_ON(!host);
	175	BUG_ON(!host->card);
	176
e29a7d73 PO	177	for (i = 0;i < host->card->sdio_funcs;i++) {
	178	if (host->card->sdio_func[i]) {
	179	sdio_remove_func(host->card->sdio_func[i]);
	180	host->card->sdio_func[i] = NULL;
	181	}
	182	}
	183
5c4e6f13 PO	184	mmc_remove_card(host->card);
	185	host->card = NULL;
	186	}
	187
	188	/*
	189	* Card detection callback from host.
	190	*/
	191	static void mmc_sdio_detect(struct mmc_host *host)
	192	{
	193	int err;
	194
	195	BUG_ON(!host);
	196	BUG_ON(!host->card);
	197
	198	mmc_claim_host(host);
	199
	200	/*
	201	* Just check if our card has been removed.
	202	*/
	203	err = mmc_select_card(host->card);
	204
	205	mmc_release_host(host);
	206
	207	if (err) {
	208	mmc_sdio_remove(host);
	209
	210	mmc_claim_host(host);
	211	mmc_detach_bus(host);
	212	mmc_release_host(host);
	213	}
	214	}
	215
	216
	217	static const struct mmc_bus_ops mmc_sdio_ops = {
	218	.remove = mmc_sdio_remove,
	219	.detect = mmc_sdio_detect,
	220	};
	221
	222
	223	/*
	224	* Starting point for SDIO card init.
	225	*/
	226	int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
	227	{
	228	int err;
e29a7d73	229	int i, funcs;
5c4e6f13 PO	230	struct mmc_card *card;
	231
	232	BUG_ON(!host);
	233	BUG_ON(!host->claimed);
	234
	235	mmc_attach_bus(host, &mmc_sdio_ops);
	236
	237	/*
	238	* Sanity check the voltages that the card claims to
	239	* support.
	240	*/
	241	if (ocr & 0x7F) {
	242	printk(KERN_WARNING "%s: card claims to support voltages "
	243	"below the defined range. These will be ignored.\n",
	244	mmc_hostname(host));
	245	ocr &= ~0x7F;
	246	}
	247
	248	if (ocr & MMC_VDD_165_195) {
	249	printk(KERN_WARNING "%s: SDIO card claims to support the "
	250	"incompletely defined 'low voltage range'. This "
	251	"will be ignored.\n", mmc_hostname(host));
	252	ocr &= ~MMC_VDD_165_195;
	253	}
	254
	255	host->ocr = mmc_select_voltage(host, ocr);
	256
	257	/*
	258	* Can we support the voltage(s) of the card(s)?
	259	*/
	260	if (!host->ocr) {
	261	err = -EINVAL;
	262	goto err;
	263	}
	264
	265	/*
	266	* Inform the card of the voltage
	267	*/
	268	err = mmc_send_io_op_cond(host, host->ocr, &ocr);
	269	if (err)
	270	goto err;
	271
	272	/*
	273	* The number of functions on the card is encoded inside
	274	* the ocr.
	275	*/
	276	funcs = (ocr & 0x70000000) >> 28;
	277
	278	/*
	279	* Allocate card structure.
	280	*/
	281	card = mmc_alloc_card(host);
	282	if (IS_ERR(card)) {
	283	err = PTR_ERR(card);
	284	goto err;
	285	}
	286
	287	card->type = MMC_TYPE_SDIO;
e29a7d73 PO	288	card->sdio_funcs = funcs;
	289
	290	host->card = card;
5c4e6f13 PO	291
	292	/*
	293	* Set card RCA.
	294	*/
	295	err = mmc_send_relative_addr(host, &card->rca);
	296	if (err)
e29a7d73	297	goto remove;
5c4e6f13 PO	298
	299	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
	300
	301	/*
	302	* Select card, as all following commands rely on that.
	303	*/
	304	err = mmc_select_card(card);
	305	if (err)
e29a7d73	306	goto remove;
5c4e6f13	307
35c66c19 PO	308	/*
	309	* Read the common registers.
	310	*/
	311	err = sdio_read_cccr(card);
	312	if (err)
	313	goto remove;
	314
1a632f8c PO	315	/*
	316	* Read the common CIS tuples.
	317	*/
	318	err = sdio_read_common_cis(card);
	319	if (err)
	320	goto remove;
	321
6db5020e PO	322	/*
	323	* No support for high-speed yet, so just set
	324	* the card's maximum speed.
	325	*/
	326	mmc_set_clock(host, card->cis.max_dtr);
	327
4ff6471c PO	328	/*
	329	* Switch to wider bus (if supported).
	330	*/
	331	err = sdio_enable_wide(card);
	332	if (err)
	333	goto remove;
	334
e29a7d73 PO	335	/*
	336	* Initialize (but don't add) all present functions.
	337	*/
	338	for (i = 0;i < funcs;i++) {
	339	err = sdio_init_func(host->card, i + 1);
	340	if (err)
	341	goto remove;
	342	}
5c4e6f13 PO	343
	344	mmc_release_host(host);
	345
e29a7d73 PO	346	/*
	347	* First add the card to the driver model...
	348	*/
5c4e6f13 PO	349	err = mmc_add_card(host->card);
5c4e6f13 PO	350	if (err)
e29a7d73 PO	351	goto remove_added;
	352
	353	/*
	354	* ...then the SDIO functions.
	355	*/
	356	for (i = 0;i < funcs;i++) {
	357	err = sdio_add_func(host->card->sdio_func[i]);
	358	if (err)
	359	goto remove_added;
	360	}
5c4e6f13 PO	361
	362	return 0;
	363
e29a7d73 PO	364
	365	remove_added:
	366	/* Remove without lock if the device has been added. */
	367	mmc_sdio_remove(host);
5c4e6f13	368	mmc_claim_host(host);
e29a7d73 PO	369	remove:
	370	/* And with lock if it hasn't been added. */
	371	if (host->card)
	372	mmc_sdio_remove(host);
5c4e6f13 PO	373	err:
	374	mmc_detach_bus(host);
	375	mmc_release_host(host);
	376
	377	printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
	378	mmc_hostname(host), err);
	379
	380	return err;
	381	}
	382