[linux-2.6-block.git] / drivers / mmc / core / sdio_irq.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * linux/drivers/mmc/core/sdio_irq.c
 *
 * Author:      Nicolas Pitre
 * Created:     June 18, 2007
 * Copyright:   MontaVista Software Inc.
 *
 * Copyright 2008 Pierre Ossman
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <uapi/linux/sched/types.h>
#include <linux/kthread.h>
#include <linux/export.h>
#include <linux/wait.h>
#include <linux/delay.h>

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

#include "sdio_ops.h"
#include "core.h"
#include "card.h"

static int process_sdio_pending_irqs(struct mmc_host *host)
{
	struct mmc_card *card = host->card;
	int i, ret, count;
	unsigned char pending;
	struct sdio_func *func;

	/*
	 * Optimization, if there is only 1 function interrupt registered
	 * and we know an IRQ was signaled then call irq handler directly.
	 * Otherwise do the full probe.
	 */
	func = card->sdio_single_irq;
	if (func && host->sdio_irq_pending) {
		func->irq_handler(func);
		return 1;
	}

	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending);
	if (ret) {
		pr_debug("%s: error %d reading SDIO_CCCR_INTx\n",
		       mmc_card_id(card), ret);
		return ret;
	}

	if (pending && mmc_card_broken_irq_polling(card) &&
	    !(host->caps & MMC_CAP_SDIO_IRQ)) {
		unsigned char dummy;

		/* A fake interrupt could be created when we poll SDIO_CCCR_INTx
		 * register with a Marvell SD8797 card. A dummy CMD52 read to
		 * function 0 register 0xff can avoid this.
		 */
		mmc_io_rw_direct(card, 0, 0, 0xff, 0, &dummy);
	}

	count = 0;
	for (i = 1; i <= 7; i++) {
		if (pending & (1 << i)) {
			func = card->sdio_func[i - 1];
			if (!func) {
				pr_warn("%s: pending IRQ for non-existent function\n",
					mmc_card_id(card));
				ret = -EINVAL;
			} else if (func->irq_handler) {
				func->irq_handler(func);
				count++;
			} else {
				pr_warn("%s: pending IRQ with no handler\n",
					sdio_func_id(func));
				ret = -EINVAL;
			}
		}
	}

	if (count)
		return count;

	return ret;
}

void sdio_run_irqs(struct mmc_host *host)
{
	mmc_claim_host(host);
	if (host->sdio_irqs) {
		host->sdio_irq_pending = true;
		process_sdio_pending_irqs(host);
		if (host->ops->ack_sdio_irq)
			host->ops->ack_sdio_irq(host);
	}
	mmc_release_host(host);
}
EXPORT_SYMBOL_GPL(sdio_run_irqs);

void sdio_irq_work(struct work_struct *work)
{
	struct mmc_host *host =
		container_of(work, struct mmc_host, sdio_irq_work.work);

	sdio_run_irqs(host);
}

void sdio_signal_irq(struct mmc_host *host)
{
	queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
}
EXPORT_SYMBOL_GPL(sdio_signal_irq);

static int sdio_irq_thread(void *_host)
{
	struct mmc_host *host = _host;
	struct sched_param param = { .sched_priority = 1 };
	unsigned long period, idle_period;
	int ret;

	sched_setscheduler(current, SCHED_FIFO, &param);

	/*
	 * We want to allow for SDIO cards to work even on non SDIO
	 * aware hosts.  One thing that non SDIO host cannot do is
	 * asynchronous notification of pending SDIO card interrupts
	 * hence we poll for them in that case.
	 */
	idle_period = msecs_to_jiffies(10);
	period = (host->caps & MMC_CAP_SDIO_IRQ) ?
		MAX_SCHEDULE_TIMEOUT : idle_period;

	pr_debug("%s: IRQ thread started (poll period = %lu jiffies)\n",
		 mmc_hostname(host), period);

	do {
		/*
		 * We claim the host here on drivers behalf for a couple
		 * reasons:
		 *
		 * 1) it is already needed to retrieve the CCCR_INTx;
		 * 2) we want the driver(s) to clear the IRQ condition ASAP;
		 * 3) we need to control the abort condition locally.
		 *
		 * Just like traditional hard IRQ handlers, we expect SDIO
		 * IRQ handlers to be quick and to the point, so that the
		 * holding of the host lock does not cover too much work
		 * that doesn't require that lock to be held.
		 */
		ret = __mmc_claim_host(host, NULL,
				       &host->sdio_irq_thread_abort);
		if (ret)
			break;
		ret = process_sdio_pending_irqs(host);
		host->sdio_irq_pending = false;
		mmc_release_host(host);

		/*
		 * Give other threads a chance to run in the presence of
		 * errors.
		 */
		if (ret < 0) {
			set_current_state(TASK_INTERRUPTIBLE);
			if (!kthread_should_stop())
				schedule_timeout(HZ);
			set_current_state(TASK_RUNNING);
		}

		/*
		 * Adaptive polling frequency based on the assumption
		 * that an interrupt will be closely followed by more.
		 * This has a substantial benefit for network devices.
		 */
		if (!(host->caps & MMC_CAP_SDIO_IRQ)) {
			if (ret > 0)
				period /= 2;
			else {
				period++;
				if (period > idle_period)
					period = idle_period;
			}
		}

		set_current_state(TASK_INTERRUPTIBLE);
		if (host->caps & MMC_CAP_SDIO_IRQ)
			host->ops->enable_sdio_irq(host, 1);
		if (!kthread_should_stop())
			schedule_timeout(period);
		set_current_state(TASK_RUNNING);
	} while (!kthread_should_stop());

	if (host->caps & MMC_CAP_SDIO_IRQ)
		host->ops->enable_sdio_irq(host, 0);

	pr_debug("%s: IRQ thread exiting with code %d\n",
		 mmc_hostname(host), ret);

	return ret;
}

static int sdio_card_irq_get(struct mmc_card *card)
{
	struct mmc_host *host = card->host;

	WARN_ON(!host->claimed);

	if (!host->sdio_irqs++) {
		if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
			atomic_set(&host->sdio_irq_thread_abort, 0);
			host->sdio_irq_thread =
				kthread_run(sdio_irq_thread, host,
					    "ksdioirqd/%s", mmc_hostname(host));
			if (IS_ERR(host->sdio_irq_thread)) {
				int err = PTR_ERR(host->sdio_irq_thread);
				host->sdio_irqs--;
				return err;
			}
		} else if (host->caps & MMC_CAP_SDIO_IRQ) {
			host->ops->enable_sdio_irq(host, 1);
		}
	}

	return 0;
}

static int sdio_card_irq_put(struct mmc_card *card)
{
	struct mmc_host *host = card->host;

	WARN_ON(!host->claimed);

	if (host->sdio_irqs < 1)
		return -EINVAL;

	if (!--host->sdio_irqs) {
		if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
			atomic_set(&host->sdio_irq_thread_abort, 1);
			kthread_stop(host->sdio_irq_thread);
		} else if (host->caps & MMC_CAP_SDIO_IRQ) {
			host->ops->enable_sdio_irq(host, 0);
		}
	}

	return 0;
}

/* If there is only 1 function registered set sdio_single_irq */
static void sdio_single_irq_set(struct mmc_card *card)
{
	struct sdio_func *func;
	int i;

	card->sdio_single_irq = NULL;
	if ((card->host->caps & MMC_CAP_SDIO_IRQ) &&
	    card->host->sdio_irqs == 1)
		for (i = 0; i < card->sdio_funcs; i++) {
		       func = card->sdio_func[i];
		       if (func && func->irq_handler) {
			       card->sdio_single_irq = func;
			       break;
		       }
	       }
}

/**
 *	sdio_claim_irq - claim the IRQ for a SDIO function
 *	@func: SDIO function
 *	@handler: IRQ handler callback
 *
 *	Claim and activate the IRQ for the given SDIO function. The provided
 *	handler will be called when that IRQ is asserted.  The host is always
 *	claimed already when the handler is called so the handler should not
 *	call sdio_claim_host() or sdio_release_host().
 */
int sdio_claim_irq(struct sdio_func *func, sdio_irq_handler_t *handler)
{
	int ret;
	unsigned char reg;

	if (!func)
		return -EINVAL;

	pr_debug("SDIO: Enabling IRQ for %s...\n", sdio_func_id(func));

	if (func->irq_handler) {
		pr_debug("SDIO: IRQ for %s already in use.\n", sdio_func_id(func));
		return -EBUSY;
	}

	ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
	if (ret)
		return ret;

	reg |= 1 << func->num;

	reg |= 1; /* Master interrupt enable */

	ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL);
	if (ret)
		return ret;

	func->irq_handler = handler;
	ret = sdio_card_irq_get(func->card);
	if (ret)
		func->irq_handler = NULL;
	sdio_single_irq_set(func->card);

	return ret;
}
EXPORT_SYMBOL_GPL(sdio_claim_irq);

/**
 *	sdio_release_irq - release the IRQ for a SDIO function
 *	@func: SDIO function
 *
 *	Disable and release the IRQ for the given SDIO function.
 */
int sdio_release_irq(struct sdio_func *func)
{
	int ret;
	unsigned char reg;

	if (!func)
		return -EINVAL;

	pr_debug("SDIO: Disabling IRQ for %s...\n", sdio_func_id(func));

	if (func->irq_handler) {
		func->irq_handler = NULL;
		sdio_card_irq_put(func->card);
		sdio_single_irq_set(func->card);
	}

	ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
	if (ret)
		return ret;

	reg &= ~(1 << func->num);

	/* Disable master interrupt with the last function interrupt */
	if (!(reg & 0xFE))
		reg = 0;

	ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL);
	if (ret)
		return ret;

	return 0;
}
EXPORT_SYMBOL_GPL(sdio_release_irq);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
d1496c39 NP	2	/*
	3	* linux/drivers/mmc/core/sdio_irq.c
	4	*
	5	* Author: Nicolas Pitre
	6	* Created: June 18, 2007
	7	* Copyright: MontaVista Software Inc.
	8	*
e633b7bc	9	* Copyright 2008 Pierre Ossman
d1496c39 NP	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/sched.h>
ae7e81c0	14	#include <uapi/linux/sched/types.h>
d1496c39	15	#include <linux/kthread.h>
3ef77af1	16	#include <linux/export.h>
d1496c39 NP	17	#include <linux/wait.h>
	18	#include <linux/delay.h>
	19
	20	#include <linux/mmc/core.h>
	21	#include <linux/mmc/host.h>
	22	#include <linux/mmc/card.h>
	23	#include <linux/mmc/sdio.h>
	24	#include <linux/mmc/sdio_func.h>
	25
	26	#include "sdio_ops.h"
55244c56	27	#include "core.h"
4facdde1	28	#include "card.h"
d1496c39	29
bbbc4c4d	30	static int process_sdio_pending_irqs(struct mmc_host *host)
d1496c39	31	{
bbbc4c4d	32	struct mmc_card *card = host->card;
6f4285d1	33	int i, ret, count;
d1496c39	34	unsigned char pending;
06e8935f SNX	35	struct sdio_func *func;
	36
	37	/*
	38	* Optimization, if there is only 1 function interrupt registered
bbbc4c4d NP	39	* and we know an IRQ was signaled then call irq handler directly.
bbbc4c4d NP	40	* Otherwise do the full probe.
06e8935f SNX	41	*/
06e8935f SNX	42	func = card->sdio_single_irq;
bbbc4c4d	43	if (func && host->sdio_irq_pending) {
06e8935f SNX	44	func->irq_handler(func);
	45	return 1;
	46	}
d1496c39 NP	47
	48	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending);
	49	if (ret) {
a3c76eb9	50	pr_debug("%s: error %d reading SDIO_CCCR_INTx\n",
d1496c39 NP	51	mmc_card_id(card), ret);
	52	return ret;
	53	}
	54
e5624054 BZ	55	if (pending && mmc_card_broken_irq_polling(card) &&
	56	!(host->caps & MMC_CAP_SDIO_IRQ)) {
	57	unsigned char dummy;
	58
	59	/* A fake interrupt could be created when we poll SDIO_CCCR_INTx
	60	* register with a Marvell SD8797 card. A dummy CMD52 read to
	61	* function 0 register 0xff can avoid this.
	62	*/
	63	mmc_io_rw_direct(card, 0, 0, 0xff, 0, &dummy);
	64	}
	65
6f4285d1	66	count = 0;
d1496c39 NP	67	for (i = 1; i <= 7; i++) {
d1496c39 NP	68	if (pending & (1 << i)) {
06e8935f	69	func = card->sdio_func[i - 1];
d1496c39	70	if (!func) {
6606110d	71	pr_warn("%s: pending IRQ for non-existent function\n",
3e01e4bc	72	mmc_card_id(card));
599473cf	73	ret = -EINVAL;
d1496c39 NP	74	} else if (func->irq_handler) {
d1496c39 NP	75	func->irq_handler(func);
6f4285d1	76	count++;
599473cf	77	} else {
6606110d JP	78	pr_warn("%s: pending IRQ with no handler\n",
6606110d JP	79	sdio_func_id(func));
599473cf NP	80	ret = -EINVAL;
599473cf NP	81	}
d1496c39 NP	82	}
	83	}
	84
599473cf NP	85	if (count)
	86	return count;
	87
	88	return ret;
d1496c39 NP	89	}
d1496c39 NP	90
bf3b5ec6 RK	91	void sdio_run_irqs(struct mmc_host *host)
	92	{
	93	mmc_claim_host(host);
e3a84267 UH	94	if (host->sdio_irqs) {
	95	host->sdio_irq_pending = true;
	96	process_sdio_pending_irqs(host);
68269660 UH	97	if (host->ops->ack_sdio_irq)
68269660 UH	98	host->ops->ack_sdio_irq(host);
e3a84267	99	}
bf3b5ec6 RK	100	mmc_release_host(host);
	101	}
	102	EXPORT_SYMBOL_GPL(sdio_run_irqs);
	103
68269660 UH	104	void sdio_irq_work(struct work_struct *work)
	105	{
	106	struct mmc_host *host =
	107	container_of(work, struct mmc_host, sdio_irq_work.work);
	108
	109	sdio_run_irqs(host);
	110	}
	111
	112	void sdio_signal_irq(struct mmc_host *host)
	113	{
	114	queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
	115	}
	116	EXPORT_SYMBOL_GPL(sdio_signal_irq);
	117
d1496c39 NP	118	static int sdio_irq_thread(void *_host)
	119	{
	120	struct mmc_host *host = _host;
	121	struct sched_param param = { .sched_priority = 1 };
6f4285d1	122	unsigned long period, idle_period;
d1496c39 NP	123	int ret;
	124
	125	sched_setscheduler(current, SCHED_FIFO, &param);
	126
	127	/*
	128	* We want to allow for SDIO cards to work even on non SDIO
	129	* aware hosts. One thing that non SDIO host cannot do is
	130	* asynchronous notification of pending SDIO card interrupts
	131	* hence we poll for them in that case.
	132	*/
6f4285d1	133	idle_period = msecs_to_jiffies(10);
17b759af	134	period = (host->caps & MMC_CAP_SDIO_IRQ) ?
6f4285d1	135	MAX_SCHEDULE_TIMEOUT : idle_period;
d1496c39 NP	136
	137	pr_debug("%s: IRQ thread started (poll period = %lu jiffies)\n",
	138	mmc_hostname(host), period);
	139
	140	do {
	141	/*
	142	* We claim the host here on drivers behalf for a couple
	143	* reasons:
	144	*
	145	* 1) it is already needed to retrieve the CCCR_INTx;
	146	* 2) we want the driver(s) to clear the IRQ condition ASAP;
	147	* 3) we need to control the abort condition locally.
	148	*
	149	* Just like traditional hard IRQ handlers, we expect SDIO
	150	* IRQ handlers to be quick and to the point, so that the
	151	* holding of the host lock does not cover too much work
	152	* that doesn't require that lock to be held.
	153	*/
6c0cedd1 AH	154	ret = __mmc_claim_host(host, NULL,
6c0cedd1 AH	155	&host->sdio_irq_thread_abort);
d1496c39 NP	156	if (ret)
d1496c39 NP	157	break;
bbbc4c4d NP	158	ret = process_sdio_pending_irqs(host);
bbbc4c4d NP	159	host->sdio_irq_pending = false;
d1496c39 NP	160	mmc_release_host(host);
	161
	162	/*
	163	* Give other threads a chance to run in the presence of
e633b7bc	164	* errors.
d1496c39	165	*/
e633b7bc PO	166	if (ret < 0) {
	167	set_current_state(TASK_INTERRUPTIBLE);
	168	if (!kthread_should_stop())
	169	schedule_timeout(HZ);
	170	set_current_state(TASK_RUNNING);
	171	}
d1496c39	172
6f4285d1 PO	173	/*
	174	* Adaptive polling frequency based on the assumption
	175	* that an interrupt will be closely followed by more.
	176	* This has a substantial benefit for network devices.
	177	*/
	178	if (!(host->caps & MMC_CAP_SDIO_IRQ)) {
	179	if (ret > 0)
	180	period /= 2;
	181	else {
	182	period++;
	183	if (period > idle_period)
	184	period = idle_period;
	185	}
	186	}
	187
6fee65cf	188	set_current_state(TASK_INTERRUPTIBLE);
9eadcc05	189	if (host->caps & MMC_CAP_SDIO_IRQ)
17b759af	190	host->ops->enable_sdio_irq(host, 1);
d1496c39 NP	191	if (!kthread_should_stop())
d1496c39 NP	192	schedule_timeout(period);
6fee65cf	193	set_current_state(TASK_RUNNING);
d1496c39 NP	194	} while (!kthread_should_stop());
d1496c39 NP	195
9eadcc05	196	if (host->caps & MMC_CAP_SDIO_IRQ)
17b759af NP	197	host->ops->enable_sdio_irq(host, 0);
17b759af NP	198
d1496c39 NP	199	pr_debug("%s: IRQ thread exiting with code %d\n",
	200	mmc_hostname(host), ret);
	201
	202	return ret;
	203	}
	204
	205	static int sdio_card_irq_get(struct mmc_card *card)
	206	{
	207	struct mmc_host *host = card->host;
	208
d84075c8	209	WARN_ON(!host->claimed);
d1496c39 NP	210
d1496c39 NP	211	if (!host->sdio_irqs++) {
bf3b5ec6 RK	212	if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
	213	atomic_set(&host->sdio_irq_thread_abort, 0);
	214	host->sdio_irq_thread =
	215	kthread_run(sdio_irq_thread, host,
	216	"ksdioirqd/%s", mmc_hostname(host));
	217	if (IS_ERR(host->sdio_irq_thread)) {
	218	int err = PTR_ERR(host->sdio_irq_thread);
	219	host->sdio_irqs--;
	220	return err;
	221	}
dea67c4e	222	} else if (host->caps & MMC_CAP_SDIO_IRQ) {
bf3b5ec6	223	host->ops->enable_sdio_irq(host, 1);
d1496c39 NP	224	}
	225	}
	226
	227	return 0;
	228	}
	229
	230	static int sdio_card_irq_put(struct mmc_card *card)
	231	{
	232	struct mmc_host *host = card->host;
	233
d84075c8	234	WARN_ON(!host->claimed);
5df0e823 SL	235
	236	if (host->sdio_irqs < 1)
	237	return -EINVAL;
d1496c39 NP	238
d1496c39 NP	239	if (!--host->sdio_irqs) {
bf3b5ec6 RK	240	if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
	241	atomic_set(&host->sdio_irq_thread_abort, 1);
	242	kthread_stop(host->sdio_irq_thread);
dea67c4e	243	} else if (host->caps & MMC_CAP_SDIO_IRQ) {
bf3b5ec6	244	host->ops->enable_sdio_irq(host, 0);
bf3b5ec6	245	}
d1496c39 NP	246	}
	247
	248	return 0;
	249	}
	250
06e8935f SNX	251	/* If there is only 1 function registered set sdio_single_irq */
	252	static void sdio_single_irq_set(struct mmc_card *card)
	253	{
	254	struct sdio_func *func;
	255	int i;
	256
	257	card->sdio_single_irq = NULL;
	258	if ((card->host->caps & MMC_CAP_SDIO_IRQ) &&
	259	card->host->sdio_irqs == 1)
	260	for (i = 0; i < card->sdio_funcs; i++) {
	261	func = card->sdio_func[i];
	262	if (func && func->irq_handler) {
	263	card->sdio_single_irq = func;
	264	break;
	265	}
	266	}
	267	}
	268
d1496c39 NP	269	/**
	270	* sdio_claim_irq - claim the IRQ for a SDIO function
	271	* @func: SDIO function
	272	* @handler: IRQ handler callback
	273	*
	274	* Claim and activate the IRQ for the given SDIO function. The provided
	275	* handler will be called when that IRQ is asserted. The host is always
8647d26e JC	276	* claimed already when the handler is called so the handler should not
8647d26e JC	277	* call sdio_claim_host() or sdio_release_host().
d1496c39 NP	278	*/
	279	int sdio_claim_irq(struct sdio_func func, sdio_irq_handler_t handler)
	280	{
	281	int ret;
	282	unsigned char reg;
	283
5df0e823 SL	284	if (!func)
5df0e823 SL	285	return -EINVAL;
d1496c39 NP	286
	287	pr_debug("SDIO: Enabling IRQ for %s...\n", sdio_func_id(func));
	288
	289	if (func->irq_handler) {
	290	pr_debug("SDIO: IRQ for %s already in use.\n", sdio_func_id(func));
	291	return -EBUSY;
	292	}
	293
	294	ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
	295	if (ret)
	296	return ret;
	297
	298	reg \|= 1 << func->num;
	299
	300	reg \|= 1; /* Master interrupt enable */
	301
	302	ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL);
	303	if (ret)
	304	return ret;
	305
	306	func->irq_handler = handler;
	307	ret = sdio_card_irq_get(func->card);
	308	if (ret)
	309	func->irq_handler = NULL;
06e8935f	310	sdio_single_irq_set(func->card);
d1496c39 NP	311
	312	return ret;
	313	}
	314	EXPORT_SYMBOL_GPL(sdio_claim_irq);
	315
	316	/**
	317	* sdio_release_irq - release the IRQ for a SDIO function
	318	* @func: SDIO function
	319	*
	320	* Disable and release the IRQ for the given SDIO function.
	321	*/
	322	int sdio_release_irq(struct sdio_func *func)
	323	{
	324	int ret;
	325	unsigned char reg;
	326
5df0e823 SL	327	if (!func)
5df0e823 SL	328	return -EINVAL;
d1496c39 NP	329
	330	pr_debug("SDIO: Disabling IRQ for %s...\n", sdio_func_id(func));
	331
	332	if (func->irq_handler) {
	333	func->irq_handler = NULL;
	334	sdio_card_irq_put(func->card);
06e8935f	335	sdio_single_irq_set(func->card);
d1496c39 NP	336	}
	337
	338	ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
	339	if (ret)
	340	return ret;
	341
	342	reg &= ~(1 << func->num);
	343
	344	/* Disable master interrupt with the last function interrupt */
	345	if (!(reg & 0xFE))
	346	reg = 0;
	347
	348	ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL);
	349	if (ret)
	350	return ret;
	351
	352	return 0;
	353	}
	354	EXPORT_SYMBOL_GPL(sdio_release_irq);
	355