[mirror_ubuntu-jammy-kernel.git] / arch / arm / plat-omap / mailbox.c

/*
 * OMAP mailbox driver
 *
 * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
 *
 * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/kfifo.h>
#include <linux/err.h>

#include <plat/mailbox.h>

static struct workqueue_struct *mboxd;
static struct omap_mbox **mboxes;
static bool rq_full;

static int mbox_configured;
static DEFINE_MUTEX(mbox_configured_lock);

static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
module_param(mbox_kfifo_size, uint, S_IRUGO);
MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");

/* Mailbox FIFO handle functions */
static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
{
	return mbox->ops->fifo_read(mbox);
}
static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
{
	mbox->ops->fifo_write(mbox, msg);
}
static inline int mbox_fifo_empty(struct omap_mbox *mbox)
{
	return mbox->ops->fifo_empty(mbox);
}
static inline int mbox_fifo_full(struct omap_mbox *mbox)
{
	return mbox->ops->fifo_full(mbox);
}

/* Mailbox IRQ handle functions */
static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
	if (mbox->ops->ack_irq)
		mbox->ops->ack_irq(mbox, irq);
}
static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
	return mbox->ops->is_irq(mbox, irq);
}

/*
 * message sender
 */
static int __mbox_poll_for_space(struct omap_mbox *mbox)
{
	int ret = 0, i = 1000;

	while (mbox_fifo_full(mbox)) {
		if (mbox->ops->type == OMAP_MBOX_TYPE2)
			return -1;
		if (--i == 0)
			return -1;
		udelay(1);
	}
	return ret;
}

int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
{
	struct omap_mbox_queue *mq = mbox->txq;
	int ret = 0, len;

	spin_lock(&mq->lock);

	if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
		ret = -ENOMEM;
		goto out;
	}

	len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
	WARN_ON(len != sizeof(msg));

	tasklet_schedule(&mbox->txq->tasklet);

out:
	spin_unlock(&mq->lock);
	return ret;
}
EXPORT_SYMBOL(omap_mbox_msg_send);

static void mbox_tx_tasklet(unsigned long tx_data)
{
	struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
	struct omap_mbox_queue *mq = mbox->txq;
	mbox_msg_t msg;
	int ret;

	while (kfifo_len(&mq->fifo)) {
		if (__mbox_poll_for_space(mbox)) {
			omap_mbox_enable_irq(mbox, IRQ_TX);
			break;
		}

		ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
								sizeof(msg));
		WARN_ON(ret != sizeof(msg));

		mbox_fifo_write(mbox, msg);
	}
}

/*
 * Message receiver(workqueue)
 */
static void mbox_rx_work(struct work_struct *work)
{
	struct omap_mbox_queue *mq =
			container_of(work, struct omap_mbox_queue, work);
	mbox_msg_t msg;
	int len;

	while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
		len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
		WARN_ON(len != sizeof(msg));

		if (mq->callback)
			mq->callback((void *)msg);
	}
}

/*
 * Mailbox interrupt handler
 */
static void __mbox_tx_interrupt(struct omap_mbox *mbox)
{
	omap_mbox_disable_irq(mbox, IRQ_TX);
	ack_mbox_irq(mbox, IRQ_TX);
	tasklet_schedule(&mbox->txq->tasklet);
}

static void __mbox_rx_interrupt(struct omap_mbox *mbox)
{
	struct omap_mbox_queue *mq = mbox->rxq;
	mbox_msg_t msg;
	int len;

	while (!mbox_fifo_empty(mbox)) {
		if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
			omap_mbox_disable_irq(mbox, IRQ_RX);
			rq_full = true;
			goto nomem;
		}

		msg = mbox_fifo_read(mbox);

		len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
		WARN_ON(len != sizeof(msg));

		if (mbox->ops->type == OMAP_MBOX_TYPE1)
			break;
	}

	/* no more messages in the fifo. clear IRQ source. */
	ack_mbox_irq(mbox, IRQ_RX);
nomem:
	queue_work(mboxd, &mbox->rxq->work);
}

static irqreturn_t mbox_interrupt(int irq, void *p)
{
	struct omap_mbox *mbox = p;

	if (is_mbox_irq(mbox, IRQ_TX))
		__mbox_tx_interrupt(mbox);

	if (is_mbox_irq(mbox, IRQ_RX))
		__mbox_rx_interrupt(mbox);

	return IRQ_HANDLED;
}

static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
					void (*work) (struct work_struct *),
					void (*tasklet)(unsigned long))
{
	struct omap_mbox_queue *mq;

	mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
	if (!mq)
		return NULL;

	spin_lock_init(&mq->lock);

	if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
		goto error;

	if (work)
		INIT_WORK(&mq->work, work);

	if (tasklet)
		tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
	return mq;
error:
	kfree(mq);
	return NULL;
}

static void mbox_queue_free(struct omap_mbox_queue *q)
{
	kfifo_free(&q->fifo);
	kfree(q);
}

static int omap_mbox_startup(struct omap_mbox *mbox)
{
	int ret = 0;
	struct omap_mbox_queue *mq;

	if (mbox->ops->startup) {
		mutex_lock(&mbox_configured_lock);
		if (!mbox_configured)
			ret = mbox->ops->startup(mbox);

		if (ret) {
			mutex_unlock(&mbox_configured_lock);
			return ret;
		}
		mbox_configured++;
		mutex_unlock(&mbox_configured_lock);
	}

	ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
				mbox->name, mbox);
	if (ret) {
		printk(KERN_ERR
			"failed to register mailbox interrupt:%d\n", ret);
		goto fail_request_irq;
	}

	mq = mbox_queue_alloc(mbox, NULL, mbox_tx_tasklet);
	if (!mq) {
		ret = -ENOMEM;
		goto fail_alloc_txq;
	}
	mbox->txq = mq;

	mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
	if (!mq) {
		ret = -ENOMEM;
		goto fail_alloc_rxq;
	}
	mbox->rxq = mq;

	return 0;

 fail_alloc_rxq:
	mbox_queue_free(mbox->txq);
 fail_alloc_txq:
	free_irq(mbox->irq, mbox);
 fail_request_irq:
	if (mbox->ops->shutdown)
		mbox->ops->shutdown(mbox);

	return ret;
}

static void omap_mbox_fini(struct omap_mbox *mbox)
{
	free_irq(mbox->irq, mbox);
	tasklet_kill(&mbox->txq->tasklet);
	flush_work(&mbox->rxq->work);
	mbox_queue_free(mbox->txq);
	mbox_queue_free(mbox->rxq);

	if (mbox->ops->shutdown) {
		mutex_lock(&mbox_configured_lock);
		if (mbox_configured > 0)
			mbox_configured--;
		if (!mbox_configured)
			mbox->ops->shutdown(mbox);
		mutex_unlock(&mbox_configured_lock);
	}
}

struct omap_mbox *omap_mbox_get(const char *name)
{
	struct omap_mbox *mbox;
	int ret;

	if (!mboxes)
		return ERR_PTR(-EINVAL);

	for (mbox = *mboxes; mbox; mbox++)
		if (!strcmp(mbox->name, name))
			break;

	if (!mbox)
		return ERR_PTR(-ENOENT);

	ret = omap_mbox_startup(mbox);
	if (ret)
		return ERR_PTR(-ENODEV);

	return mbox;
}
EXPORT_SYMBOL(omap_mbox_get);

void omap_mbox_put(struct omap_mbox *mbox)
{
	omap_mbox_fini(mbox);
}
EXPORT_SYMBOL(omap_mbox_put);

static struct class omap_mbox_class = { .name = "mbox", };

int omap_mbox_register(struct device *parent, struct omap_mbox **list)
{
	int ret;
	int i;

	mboxes = list;
	if (!mboxes)
		return -EINVAL;

	for (i = 0; mboxes[i]; i++) {
		struct omap_mbox *mbox = mboxes[i];
		mbox->dev = device_create(&omap_mbox_class,
				parent, 0, mbox, "%s", mbox->name);
		if (IS_ERR(mbox->dev)) {
			ret = PTR_ERR(mbox->dev);
			goto err_out;
		}
	}
	return 0;

err_out:
	while (i--)
		device_unregister(mboxes[i]->dev);
	return ret;
}
EXPORT_SYMBOL(omap_mbox_register);

int omap_mbox_unregister(void)
{
	int i;

	if (!mboxes)
		return -EINVAL;

	for (i = 0; mboxes[i]; i++)
		device_unregister(mboxes[i]->dev);
	mboxes = NULL;
	return 0;
}
EXPORT_SYMBOL(omap_mbox_unregister);

static int __init omap_mbox_init(void)
{
	int err;

	err = class_register(&omap_mbox_class);
	if (err)
		return err;

	mboxd = create_workqueue("mboxd");
	if (!mboxd)
		return -ENOMEM;

	/* kfifo size sanity check: alignment and minimal size */
	mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
	mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size, sizeof(mbox_msg_t));

	return 0;
}
subsys_initcall(omap_mbox_init);

static void __exit omap_mbox_exit(void)
{
	destroy_workqueue(mboxd);
	class_unregister(&omap_mbox_class);
}
module_exit(omap_mbox_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
MODULE_AUTHOR("Toshihiro Kobayashi");
MODULE_AUTHOR("Hiroshi DOYU");
Commit	Line	Data
340a614a HD	1	/*
	2	* OMAP mailbox driver
	3	*
f48cca87	4	* Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
340a614a	5	*
f48cca87	6	* Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
340a614a HD	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
b5bebe41	24	#include <linux/kernel.h>
340a614a	25	#include <linux/module.h>
340a614a HD	26	#include <linux/interrupt.h>
340a614a HD	27	#include <linux/device.h>
340a614a	28	#include <linux/delay.h>
5a0e3ad6	29	#include <linux/slab.h>
b5bebe41 OBC	30	#include <linux/kfifo.h>
b5bebe41 OBC	31	#include <linux/err.h>
8dff0fa5	32
ce491cf8	33	#include <plat/mailbox.h>
340a614a	34
8250a5c3	35	static struct workqueue_struct *mboxd;
9c80c8cd	36	static struct omap_mbox **mboxes;
1ea5d6d1	37	static bool rq_full;
340a614a	38
5f00ec64	39	static int mbox_configured;
72b917ef	40	static DEFINE_MUTEX(mbox_configured_lock);
5f00ec64	41
b5bebe41 OBC	42	static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
	43	module_param(mbox_kfifo_size, uint, S_IRUGO);
	44	MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");
	45
9ae0ee00 HD	46	/* Mailbox FIFO handle functions */
	47	static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
	48	{
	49	return mbox->ops->fifo_read(mbox);
	50	}
	51	static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
	52	{
	53	mbox->ops->fifo_write(mbox, msg);
	54	}
	55	static inline int mbox_fifo_empty(struct omap_mbox *mbox)
	56	{
	57	return mbox->ops->fifo_empty(mbox);
	58	}
	59	static inline int mbox_fifo_full(struct omap_mbox *mbox)
	60	{
	61	return mbox->ops->fifo_full(mbox);
	62	}
	63
	64	/* Mailbox IRQ handle functions */
9ae0ee00 HD	65	static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	66	{
	67	if (mbox->ops->ack_irq)
	68	mbox->ops->ack_irq(mbox, irq);
	69	}
	70	static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	71	{
	72	return mbox->ops->is_irq(mbox, irq);
	73	}
	74
340a614a HD	75	/*
	76	* message sender
	77	*/
b5bebe41	78	static int __mbox_poll_for_space(struct omap_mbox *mbox)
340a614a HD	79	{
	80	int ret = 0, i = 1000;
	81
	82	while (mbox_fifo_full(mbox)) {
	83	if (mbox->ops->type == OMAP_MBOX_TYPE2)
	84	return -1;
	85	if (--i == 0)
	86	return -1;
	87	udelay(1);
	88	}
340a614a HD	89	return ret;
	90	}
	91
b2b6362e	92	int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
340a614a	93	{
b5bebe41 OBC	94	struct omap_mbox_queue *mq = mbox->txq;
b5bebe41 OBC	95	int ret = 0, len;
5ed8d32e	96
b5bebe41	97	spin_lock(&mq->lock);
ec24751a	98
b5bebe41 OBC	99	if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
	100	ret = -ENOMEM;
	101	goto out;
	102	}
	103
	104	len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
	105	WARN_ON(len != sizeof(msg));
340a614a	106
5ed8d32e	107	tasklet_schedule(&mbox->txq->tasklet);
340a614a	108
b5bebe41 OBC	109	out:
	110	spin_unlock(&mq->lock);
	111	return ret;
340a614a HD	112	}
	113	EXPORT_SYMBOL(omap_mbox_msg_send);
	114
5ed8d32e	115	static void mbox_tx_tasklet(unsigned long tx_data)
340a614a	116	{
5ed8d32e	117	struct omap_mbox mbox = (struct omap_mbox )tx_data;
b5bebe41 OBC	118	struct omap_mbox_queue *mq = mbox->txq;
	119	mbox_msg_t msg;
	120	int ret;
340a614a	121
b5bebe41 OBC	122	while (kfifo_len(&mq->fifo)) {
b5bebe41 OBC	123	if (__mbox_poll_for_space(mbox)) {
eb18858e	124	omap_mbox_enable_irq(mbox, IRQ_TX);
b5bebe41	125	break;
340a614a	126	}
b5bebe41 OBC	127
	128	ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
	129	sizeof(msg));
	130	WARN_ON(ret != sizeof(msg));
	131
	132	mbox_fifo_write(mbox, msg);
340a614a HD	133	}
	134	}
	135
	136	/*
	137	* Message receiver(workqueue)
	138	*/
	139	static void mbox_rx_work(struct work_struct *work)
	140	{
	141	struct omap_mbox_queue *mq =
	142	container_of(work, struct omap_mbox_queue, work);
340a614a	143	mbox_msg_t msg;
b5bebe41 OBC	144	int len;
	145
	146	while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
	147	len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
	148	WARN_ON(len != sizeof(msg));
340a614a	149
b5bebe41 OBC	150	if (mq->callback)
b5bebe41 OBC	151	mq->callback((void *)msg);
340a614a HD	152	}
	153	}
	154
	155	/*
	156	* Mailbox interrupt handler
	157	*/
340a614a HD	158	static void __mbox_tx_interrupt(struct omap_mbox *mbox)
340a614a HD	159	{
eb18858e	160	omap_mbox_disable_irq(mbox, IRQ_TX);
340a614a	161	ack_mbox_irq(mbox, IRQ_TX);
5ed8d32e	162	tasklet_schedule(&mbox->txq->tasklet);
340a614a HD	163	}
	164
	165	static void __mbox_rx_interrupt(struct omap_mbox *mbox)
	166	{
b5bebe41	167	struct omap_mbox_queue *mq = mbox->rxq;
340a614a	168	mbox_msg_t msg;
b5bebe41	169	int len;
340a614a	170
340a614a	171	while (!mbox_fifo_empty(mbox)) {
b5bebe41	172	if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
1ea5d6d1 FGL	173	omap_mbox_disable_irq(mbox, IRQ_RX);
1ea5d6d1 FGL	174	rq_full = true;
340a614a	175	goto nomem;
1ea5d6d1	176	}
340a614a HD	177
340a614a HD	178	msg = mbox_fifo_read(mbox);
340a614a	179
b5bebe41 OBC	180	len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
b5bebe41 OBC	181	WARN_ON(len != sizeof(msg));
340a614a	182
340a614a HD	183	if (mbox->ops->type == OMAP_MBOX_TYPE1)
	184	break;
	185	}
	186
	187	/* no more messages in the fifo. clear IRQ source. */
	188	ack_mbox_irq(mbox, IRQ_RX);
f48cca87	189	nomem:
8250a5c3	190	queue_work(mboxd, &mbox->rxq->work);
340a614a HD	191	}
	192
	193	static irqreturn_t mbox_interrupt(int irq, void *p)
	194	{
2a7057e3	195	struct omap_mbox *mbox = p;
340a614a HD	196
	197	if (is_mbox_irq(mbox, IRQ_TX))
	198	__mbox_tx_interrupt(mbox);
	199
	200	if (is_mbox_irq(mbox, IRQ_RX))
	201	__mbox_rx_interrupt(mbox);
	202
	203	return IRQ_HANDLED;
	204	}
	205
340a614a	206	static struct omap_mbox_queue mbox_queue_alloc(struct omap_mbox mbox,
5ed8d32e S	207	void (work) (struct work_struct ),
5ed8d32e S	208	void (*tasklet)(unsigned long))
340a614a	209	{
340a614a HD	210	struct omap_mbox_queue *mq;
	211
	212	mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
	213	if (!mq)
	214	return NULL;
	215
	216	spin_lock_init(&mq->lock);
	217
b5bebe41	218	if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
340a614a	219	goto error;
340a614a	220
5ed8d32e S	221	if (work)
5ed8d32e S	222	INIT_WORK(&mq->work, work);
340a614a	223
5ed8d32e S	224	if (tasklet)
5ed8d32e S	225	tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
340a614a HD	226	return mq;
	227	error:
	228	kfree(mq);
	229	return NULL;
	230	}
	231
	232	static void mbox_queue_free(struct omap_mbox_queue *q)
	233	{
b5bebe41	234	kfifo_free(&q->fifo);
340a614a HD	235	kfree(q);
	236	}
	237
c7c158e5	238	static int omap_mbox_startup(struct omap_mbox *mbox)
340a614a	239	{
5f00ec64	240	int ret = 0;
340a614a HD	241	struct omap_mbox_queue *mq;
340a614a HD	242
01072d8f	243	if (mbox->ops->startup) {
72b917ef	244	mutex_lock(&mbox_configured_lock);
5f00ec64 S	245	if (!mbox_configured)
	246	ret = mbox->ops->startup(mbox);
	247
01072d8f	248	if (ret) {
72b917ef	249	mutex_unlock(&mbox_configured_lock);
340a614a	250	return ret;
5f00ec64 S	251	}
5f00ec64 S	252	mbox_configured++;
72b917ef	253	mutex_unlock(&mbox_configured_lock);
340a614a HD	254	}
340a614a HD	255
5e683825	256	ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
340a614a	257	mbox->name, mbox);
01072d8f	258	if (ret) {
340a614a HD	259	printk(KERN_ERR
	260	"failed to register mailbox interrupt:%d\n", ret);
	261	goto fail_request_irq;
	262	}
340a614a	263
b5bebe41	264	mq = mbox_queue_alloc(mbox, NULL, mbox_tx_tasklet);
340a614a HD	265	if (!mq) {
	266	ret = -ENOMEM;
	267	goto fail_alloc_txq;
	268	}
	269	mbox->txq = mq;
	270
b5bebe41	271	mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
340a614a HD	272	if (!mq) {
	273	ret = -ENOMEM;
	274	goto fail_alloc_rxq;
	275	}
	276	mbox->rxq = mq;
	277
	278	return 0;
	279
	280	fail_alloc_rxq:
	281	mbox_queue_free(mbox->txq);
	282	fail_alloc_txq:
	283	free_irq(mbox->irq, mbox);
	284	fail_request_irq:
01072d8f	285	if (mbox->ops->shutdown)
340a614a HD	286	mbox->ops->shutdown(mbox);
	287
	288	return ret;
	289	}
	290
	291	static void omap_mbox_fini(struct omap_mbox *mbox)
	292	{
ad6d9627	293	free_irq(mbox->irq, mbox);
0e828e8c FGL	294	tasklet_kill(&mbox->txq->tasklet);
0e828e8c FGL	295	flush_work(&mbox->rxq->work);
340a614a HD	296	mbox_queue_free(mbox->txq);
	297	mbox_queue_free(mbox->rxq);
	298
01072d8f	299	if (mbox->ops->shutdown) {
72b917ef	300	mutex_lock(&mbox_configured_lock);
5f00ec64 S	301	if (mbox_configured > 0)
	302	mbox_configured--;
	303	if (!mbox_configured)
	304	mbox->ops->shutdown(mbox);
72b917ef	305	mutex_unlock(&mbox_configured_lock);
5f00ec64	306	}
340a614a HD	307	}
340a614a HD	308
340a614a HD	309	struct omap_mbox omap_mbox_get(const char name)
	310	{
	311	struct omap_mbox *mbox;
	312	int ret;
	313
9c80c8cd FC	314	if (!mboxes)
9c80c8cd FC	315	return ERR_PTR(-EINVAL);
340a614a	316
9c80c8cd FC	317	for (mbox = *mboxes; mbox; mbox++)
	318	if (!strcmp(mbox->name, name))
	319	break;
	320
	321	if (!mbox)
	322	return ERR_PTR(-ENOENT);
340a614a	323
c7c158e5	324	ret = omap_mbox_startup(mbox);
340a614a HD	325	if (ret)
	326	return ERR_PTR(-ENODEV);
	327
	328	return mbox;
	329	}
	330	EXPORT_SYMBOL(omap_mbox_get);
	331
	332	void omap_mbox_put(struct omap_mbox *mbox)
	333	{
	334	omap_mbox_fini(mbox);
	335	}
	336	EXPORT_SYMBOL(omap_mbox_put);
	337
6b233985 HD	338	static struct class omap_mbox_class = { .name = "mbox", };
6b233985 HD	339
9c80c8cd	340	int omap_mbox_register(struct device parent, struct omap_mbox *list)
340a614a	341	{
9c80c8cd FC	342	int ret;
9c80c8cd FC	343	int i;
340a614a	344
9c80c8cd FC	345	mboxes = list;
9c80c8cd FC	346	if (!mboxes)
340a614a	347	return -EINVAL;
340a614a	348
9c80c8cd FC	349	for (i = 0; mboxes[i]; i++) {
	350	struct omap_mbox *mbox = mboxes[i];
	351	mbox->dev = device_create(&omap_mbox_class,
	352	parent, 0, mbox, "%s", mbox->name);
	353	if (IS_ERR(mbox->dev)) {
	354	ret = PTR_ERR(mbox->dev);
	355	goto err_out;
	356	}
	357	}
f48cca87 HD	358	return 0;
f48cca87 HD	359
9c80c8cd FC	360	err_out:
	361	while (i--)
	362	device_unregister(mboxes[i]->dev);
340a614a HD	363	return ret;
	364	}
	365	EXPORT_SYMBOL(omap_mbox_register);
	366
9c80c8cd	367	int omap_mbox_unregister(void)
340a614a	368	{
9c80c8cd	369	int i;
340a614a	370
9c80c8cd FC	371	if (!mboxes)
	372	return -EINVAL;
	373
	374	for (i = 0; mboxes[i]; i++)
	375	device_unregister(mboxes[i]->dev);
	376	mboxes = NULL;
	377	return 0;
340a614a HD	378	}
	379	EXPORT_SYMBOL(omap_mbox_unregister);
	380
c7c158e5	381	static int __init omap_mbox_init(void)
340a614a	382	{
6b233985 HD	383	int err;
	384
	385	err = class_register(&omap_mbox_class);
	386	if (err)
	387	return err;
	388
8250a5c3 RC	389	mboxd = create_workqueue("mboxd");
	390	if (!mboxd)
	391	return -ENOMEM;
	392
b5bebe41 OBC	393	/* kfifo size sanity check: alignment and minimal size */
	394	mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
	395	mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size, sizeof(mbox_msg_t));
	396
c7c158e5	397	return 0;
340a614a	398	}
6b233985	399	subsys_initcall(omap_mbox_init);
340a614a	400
c7c158e5	401	static void __exit omap_mbox_exit(void)
340a614a	402	{
8250a5c3	403	destroy_workqueue(mboxd);
6b233985	404	class_unregister(&omap_mbox_class);
340a614a	405	}
c7c158e5	406	module_exit(omap_mbox_exit);
340a614a	407
f48cca87 HD	408	MODULE_LICENSE("GPL v2");
f48cca87 HD	409	MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
f375325a OBC	410	MODULE_AUTHOR("Toshihiro Kobayashi");
f375325a OBC	411	MODULE_AUTHOR("Hiroshi DOYU");