[linux-2.6-block.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/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>

#include <plat/mailbox.h>

static struct workqueue_struct *mboxd;
static struct omap_mbox *mboxes;
static DEFINE_RWLOCK(mboxes_lock);

static int mbox_configured;

/* 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_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
{
	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);
	}
	mbox_fifo_write(mbox, msg);
	return ret;
}


int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
{

	struct request *rq;
	struct request_queue *q = mbox->txq->queue;

	rq = blk_get_request(q, WRITE, GFP_ATOMIC);
	if (unlikely(!rq))
		return -ENOMEM;

	blk_insert_request(q, rq, 0, (void *) msg);
	tasklet_schedule(&mbox->txq->tasklet);

	return 0;
}
EXPORT_SYMBOL(omap_mbox_msg_send);

static void mbox_tx_tasklet(unsigned long tx_data)
{
	int ret;
	struct request *rq;
	struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
	struct request_queue *q = mbox->txq->queue;

	while (1) {

		rq = blk_fetch_request(q);

		if (!rq)
			break;

		ret = __mbox_msg_send(mbox, (mbox_msg_t)rq->special);
		if (ret) {
			omap_mbox_enable_irq(mbox, IRQ_TX);
			blk_requeue_request(q, rq);
			return;
		}
		blk_end_request_all(rq, 0);
	}
}

/*
 * 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);
	struct omap_mbox *mbox = mq->queue->queuedata;
	struct request_queue *q = mbox->rxq->queue;
	struct request *rq;
	mbox_msg_t msg;
	unsigned long flags;

	while (1) {
		spin_lock_irqsave(q->queue_lock, flags);
		rq = blk_fetch_request(q);
		spin_unlock_irqrestore(q->queue_lock, flags);
		if (!rq)
			break;

		msg = (mbox_msg_t)rq->special;
		blk_end_request_all(rq, 0);
		mbox->rxq->callback((void *)msg);
	}
}

/*
 * Mailbox interrupt handler
 */
static void mbox_txq_fn(struct request_queue *q)
{
}

static void mbox_rxq_fn(struct request_queue *q)
{
}

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 request *rq;
	mbox_msg_t msg;
	struct request_queue *q = mbox->rxq->queue;

	while (!mbox_fifo_empty(mbox)) {
		rq = blk_get_request(q, WRITE, GFP_ATOMIC);
		if (unlikely(!rq))
			goto nomem;

		msg = mbox_fifo_read(mbox);


		blk_insert_request(q, rq, 0, (void *)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,
					request_fn_proc *proc,
					void (*work) (struct work_struct *),
					void (*tasklet)(unsigned long))
{
	struct request_queue *q;
	struct omap_mbox_queue *mq;

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

	spin_lock_init(&mq->lock);

	q = blk_init_queue(proc, &mq->lock);
	if (!q)
		goto error;
	q->queuedata = mbox;
	mq->queue = q;

	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)
{
	blk_cleanup_queue(q->queue);
	kfree(q);
}

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

	if (likely(mbox->ops->startup)) {
		write_lock(&mboxes_lock);
		if (!mbox_configured)
			ret = mbox->ops->startup(mbox);

		if (unlikely(ret)) {
			write_unlock(&mboxes_lock);
			return ret;
		}
		mbox_configured++;
		write_unlock(&mboxes_lock);
	}

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

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

	mq = mbox_queue_alloc(mbox, mbox_rxq_fn, 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 (unlikely(mbox->ops->shutdown))
		mbox->ops->shutdown(mbox);

	return ret;
}

static void omap_mbox_fini(struct omap_mbox *mbox)
{
	mbox_queue_free(mbox->txq);
	mbox_queue_free(mbox->rxq);

	free_irq(mbox->irq, mbox);

	if (unlikely(mbox->ops->shutdown)) {
		write_lock(&mboxes_lock);
		if (mbox_configured > 0)
			mbox_configured--;
		if (!mbox_configured)
			mbox->ops->shutdown(mbox);
		write_unlock(&mboxes_lock);
	}
}

static struct omap_mbox **find_mboxes(const char *name)
{
	struct omap_mbox **p;

	for (p = &mboxes; *p; p = &(*p)->next) {
		if (strcmp((*p)->name, name) == 0)
			break;
	}

	return p;
}

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

	read_lock(&mboxes_lock);
	mbox = *(find_mboxes(name));
	if (mbox == NULL) {
		read_unlock(&mboxes_lock);
		return ERR_PTR(-ENOENT);
	}

	read_unlock(&mboxes_lock);

	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);

int omap_mbox_register(struct device *parent, struct omap_mbox *mbox)
{
	int ret = 0;
	struct omap_mbox **tmp;

	if (!mbox)
		return -EINVAL;
	if (mbox->next)
		return -EBUSY;

	write_lock(&mboxes_lock);
	tmp = find_mboxes(mbox->name);
	if (*tmp) {
		ret = -EBUSY;
		write_unlock(&mboxes_lock);
		goto err_find;
	}
	*tmp = mbox;
	write_unlock(&mboxes_lock);

	return 0;

err_find:
	return ret;
}
EXPORT_SYMBOL(omap_mbox_register);

int omap_mbox_unregister(struct omap_mbox *mbox)
{
	struct omap_mbox **tmp;

	write_lock(&mboxes_lock);
	tmp = &mboxes;
	while (*tmp) {
		if (mbox == *tmp) {
			*tmp = mbox->next;
			mbox->next = NULL;
			write_unlock(&mboxes_lock);
			return 0;
		}
		tmp = &(*tmp)->next;
	}
	write_unlock(&mboxes_lock);

	return -EINVAL;
}
EXPORT_SYMBOL(omap_mbox_unregister);

static int __init omap_mbox_init(void)
{
	mboxd = create_workqueue("mboxd");
	if (!mboxd)
		return -ENOMEM;

	return 0;
}
module_init(omap_mbox_init);

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

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
MODULE_AUTHOR("Toshihiro Kobayashi and 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
340a614a	24	#include <linux/module.h>
340a614a HD	25	#include <linux/interrupt.h>
340a614a HD	26	#include <linux/device.h>
340a614a	27	#include <linux/delay.h>
5a0e3ad6	28	#include <linux/slab.h>
8dff0fa5	29
ce491cf8	30	#include <plat/mailbox.h>
340a614a	31
8250a5c3	32	static struct workqueue_struct *mboxd;
340a614a HD	33	static struct omap_mbox *mboxes;
	34	static DEFINE_RWLOCK(mboxes_lock);
	35
5f00ec64 S	36	static int mbox_configured;
5f00ec64 S	37
9ae0ee00 HD	38	/* Mailbox FIFO handle functions */
	39	static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
	40	{
	41	return mbox->ops->fifo_read(mbox);
	42	}
	43	static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
	44	{
	45	mbox->ops->fifo_write(mbox, msg);
	46	}
	47	static inline int mbox_fifo_empty(struct omap_mbox *mbox)
	48	{
	49	return mbox->ops->fifo_empty(mbox);
	50	}
	51	static inline int mbox_fifo_full(struct omap_mbox *mbox)
	52	{
	53	return mbox->ops->fifo_full(mbox);
	54	}
	55
	56	/* Mailbox IRQ handle functions */
9ae0ee00 HD	57	static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	58	{
	59	if (mbox->ops->ack_irq)
	60	mbox->ops->ack_irq(mbox, irq);
	61	}
	62	static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	63	{
	64	return mbox->ops->is_irq(mbox, irq);
	65	}
	66
340a614a HD	67	/*
	68	* message sender
	69	*/
c7c158e5	70	static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
340a614a HD	71	{
	72	int ret = 0, i = 1000;
	73
	74	while (mbox_fifo_full(mbox)) {
	75	if (mbox->ops->type == OMAP_MBOX_TYPE2)
	76	return -1;
	77	if (--i == 0)
	78	return -1;
	79	udelay(1);
	80	}
340a614a	81	mbox_fifo_write(mbox, msg);
340a614a HD	82	return ret;
	83	}
	84
ec24751a	85
b2b6362e	86	int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
340a614a	87	{
5ed8d32e	88
340a614a HD	89	struct request *rq;
340a614a HD	90	struct request_queue *q = mbox->txq->queue;
ec24751a	91
340a614a	92	rq = blk_get_request(q, WRITE, GFP_ATOMIC);
5ed8d32e	93	if (unlikely(!rq))
ec24751a	94	return -ENOMEM;
340a614a	95
5ed8d32e S	96	blk_insert_request(q, rq, 0, (void *) msg);
5ed8d32e S	97	tasklet_schedule(&mbox->txq->tasklet);
340a614a	98
ec24751a	99	return 0;
340a614a HD	100	}
	101	EXPORT_SYMBOL(omap_mbox_msg_send);
	102
5ed8d32e	103	static void mbox_tx_tasklet(unsigned long tx_data)
340a614a HD	104	{
	105	int ret;
	106	struct request *rq;
5ed8d32e	107	struct omap_mbox mbox = (struct omap_mbox )tx_data;
340a614a HD	108	struct request_queue *q = mbox->txq->queue;
	109
	110	while (1) {
ec24751a	111
9934c8c0	112	rq = blk_fetch_request(q);
340a614a HD	113
	114	if (!rq)
	115	break;
	116
5ed8d32e	117	ret = __mbox_msg_send(mbox, (mbox_msg_t)rq->special);
340a614a	118	if (ret) {
eb18858e	119	omap_mbox_enable_irq(mbox, IRQ_TX);
296b2f6a	120	blk_requeue_request(q, rq);
340a614a HD	121	return;
340a614a HD	122	}
5ed8d32e	123	blk_end_request_all(rq, 0);
340a614a HD	124	}
	125	}
	126
	127	/*
	128	* Message receiver(workqueue)
	129	*/
	130	static void mbox_rx_work(struct work_struct *work)
	131	{
	132	struct omap_mbox_queue *mq =
	133	container_of(work, struct omap_mbox_queue, work);
	134	struct omap_mbox *mbox = mq->queue->queuedata;
	135	struct request_queue *q = mbox->rxq->queue;
	136	struct request *rq;
	137	mbox_msg_t msg;
	138	unsigned long flags;
	139
340a614a HD	140	while (1) {
340a614a HD	141	spin_lock_irqsave(q->queue_lock, flags);
9934c8c0	142	rq = blk_fetch_request(q);
340a614a HD	143	spin_unlock_irqrestore(q->queue_lock, flags);
	144	if (!rq)
	145	break;
	146
ec24751a	147	msg = (mbox_msg_t)rq->special;
40cbbb78	148	blk_end_request_all(rq, 0);
340a614a HD	149	mbox->rxq->callback((void *)msg);
	150	}
	151	}
	152
	153	/*
	154	* Mailbox interrupt handler
	155	*/
bfe1f6ac	156	static void mbox_txq_fn(struct request_queue *q)
340a614a HD	157	{
	158	}
	159
bfe1f6ac	160	static void mbox_rxq_fn(struct request_queue *q)
340a614a HD	161	{
	162	}
	163
	164	static void __mbox_tx_interrupt(struct omap_mbox *mbox)
	165	{
eb18858e	166	omap_mbox_disable_irq(mbox, IRQ_TX);
340a614a	167	ack_mbox_irq(mbox, IRQ_TX);
5ed8d32e	168	tasklet_schedule(&mbox->txq->tasklet);
340a614a HD	169	}
	170
	171	static void __mbox_rx_interrupt(struct omap_mbox *mbox)
	172	{
	173	struct request *rq;
	174	mbox_msg_t msg;
165125e1	175	struct request_queue *q = mbox->rxq->queue;
340a614a	176
340a614a HD	177	while (!mbox_fifo_empty(mbox)) {
	178	rq = blk_get_request(q, WRITE, GFP_ATOMIC);
	179	if (unlikely(!rq))
	180	goto nomem;
	181
	182	msg = mbox_fifo_read(mbox);
340a614a	183
340a614a	184
ec24751a	185	blk_insert_request(q, rq, 0, (void *)msg);
340a614a HD	186	if (mbox->ops->type == OMAP_MBOX_TYPE1)
	187	break;
	188	}
	189
	190	/* no more messages in the fifo. clear IRQ source. */
	191	ack_mbox_irq(mbox, IRQ_RX);
f48cca87	192	nomem:
8250a5c3	193	queue_work(mboxd, &mbox->rxq->work);
340a614a HD	194	}
	195
	196	static irqreturn_t mbox_interrupt(int irq, void *p)
	197	{
2a7057e3	198	struct omap_mbox *mbox = p;
340a614a HD	199
	200	if (is_mbox_irq(mbox, IRQ_TX))
	201	__mbox_tx_interrupt(mbox);
	202
	203	if (is_mbox_irq(mbox, IRQ_RX))
	204	__mbox_rx_interrupt(mbox);
	205
	206	return IRQ_HANDLED;
	207	}
	208
340a614a	209	static struct omap_mbox_queue mbox_queue_alloc(struct omap_mbox mbox,
bfe1f6ac	210	request_fn_proc *proc,
5ed8d32e S	211	void (work) (struct work_struct ),
5ed8d32e S	212	void (*tasklet)(unsigned long))
340a614a	213	{
165125e1	214	struct request_queue *q;
340a614a HD	215	struct omap_mbox_queue *mq;
	216
	217	mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
	218	if (!mq)
	219	return NULL;
	220
	221	spin_lock_init(&mq->lock);
	222
	223	q = blk_init_queue(proc, &mq->lock);
	224	if (!q)
	225	goto error;
	226	q->queuedata = mbox;
	227	mq->queue = q;
	228
5ed8d32e S	229	if (work)
5ed8d32e S	230	INIT_WORK(&mq->work, work);
340a614a	231
5ed8d32e S	232	if (tasklet)
5ed8d32e S	233	tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
340a614a HD	234	return mq;
	235	error:
	236	kfree(mq);
	237	return NULL;
	238	}
	239
	240	static void mbox_queue_free(struct omap_mbox_queue *q)
	241	{
	242	blk_cleanup_queue(q->queue);
	243	kfree(q);
	244	}
	245
c7c158e5	246	static int omap_mbox_startup(struct omap_mbox *mbox)
340a614a	247	{
5f00ec64	248	int ret = 0;
340a614a HD	249	struct omap_mbox_queue *mq;
	250
	251	if (likely(mbox->ops->startup)) {
5f00ec64 S	252	write_lock(&mboxes_lock);
	253	if (!mbox_configured)
	254	ret = mbox->ops->startup(mbox);
	255
	256	if (unlikely(ret)) {
	257	write_unlock(&mboxes_lock);
340a614a	258	return ret;
5f00ec64 S	259	}
	260	mbox_configured++;
	261	write_unlock(&mboxes_lock);
340a614a HD	262	}
340a614a HD	263
5e683825	264	ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
340a614a HD	265	mbox->name, mbox);
	266	if (unlikely(ret)) {
	267	printk(KERN_ERR
	268	"failed to register mailbox interrupt:%d\n", ret);
	269	goto fail_request_irq;
	270	}
340a614a	271
5ed8d32e	272	mq = mbox_queue_alloc(mbox, mbox_txq_fn, NULL, mbox_tx_tasklet);
340a614a HD	273	if (!mq) {
	274	ret = -ENOMEM;
	275	goto fail_alloc_txq;
	276	}
	277	mbox->txq = mq;
	278
5ed8d32e	279	mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work, NULL);
340a614a HD	280	if (!mq) {
	281	ret = -ENOMEM;
	282	goto fail_alloc_rxq;
	283	}
	284	mbox->rxq = mq;
	285
	286	return 0;
	287
	288	fail_alloc_rxq:
	289	mbox_queue_free(mbox->txq);
	290	fail_alloc_txq:
	291	free_irq(mbox->irq, mbox);
	292	fail_request_irq:
340a614a HD	293	if (unlikely(mbox->ops->shutdown))
	294	mbox->ops->shutdown(mbox);
	295
	296	return ret;
	297	}
	298
	299	static void omap_mbox_fini(struct omap_mbox *mbox)
	300	{
	301	mbox_queue_free(mbox->txq);
	302	mbox_queue_free(mbox->rxq);
	303
	304	free_irq(mbox->irq, mbox);
340a614a	305
5f00ec64 S	306	if (unlikely(mbox->ops->shutdown)) {
	307	write_lock(&mboxes_lock);
	308	if (mbox_configured > 0)
	309	mbox_configured--;
	310	if (!mbox_configured)
	311	mbox->ops->shutdown(mbox);
	312	write_unlock(&mboxes_lock);
	313	}
340a614a HD	314	}
	315
	316	static struct omap_mbox *find_mboxes(const char name)
	317	{
	318	struct omap_mbox **p;
	319
	320	for (p = &mboxes; p; p = &(p)->next) {
	321	if (strcmp((*p)->name, name) == 0)
	322	break;
	323	}
	324
	325	return p;
	326	}
	327
	328	struct omap_mbox omap_mbox_get(const char name)
	329	{
	330	struct omap_mbox *mbox;
	331	int ret;
	332
	333	read_lock(&mboxes_lock);
	334	mbox = *(find_mboxes(name));
	335	if (mbox == NULL) {
	336	read_unlock(&mboxes_lock);
	337	return ERR_PTR(-ENOENT);
	338	}
	339
	340	read_unlock(&mboxes_lock);
	341
c7c158e5	342	ret = omap_mbox_startup(mbox);
340a614a HD	343	if (ret)
	344	return ERR_PTR(-ENODEV);
	345
	346	return mbox;
	347	}
	348	EXPORT_SYMBOL(omap_mbox_get);
	349
	350	void omap_mbox_put(struct omap_mbox *mbox)
	351	{
	352	omap_mbox_fini(mbox);
	353	}
	354	EXPORT_SYMBOL(omap_mbox_put);
	355
f48cca87	356	int omap_mbox_register(struct device parent, struct omap_mbox mbox)
340a614a HD	357	{
	358	int ret = 0;
	359	struct omap_mbox **tmp;
	360
	361	if (!mbox)
	362	return -EINVAL;
	363	if (mbox->next)
	364	return -EBUSY;
	365
	366	write_lock(&mboxes_lock);
	367	tmp = find_mboxes(mbox->name);
f48cca87	368	if (*tmp) {
340a614a	369	ret = -EBUSY;
f48cca87 HD	370	write_unlock(&mboxes_lock);
	371	goto err_find;
	372	}
	373	*tmp = mbox;
340a614a HD	374	write_unlock(&mboxes_lock);
340a614a HD	375
f48cca87 HD	376	return 0;
	377
	378	err_find:
340a614a HD	379	return ret;
	380	}
	381	EXPORT_SYMBOL(omap_mbox_register);
	382
	383	int omap_mbox_unregister(struct omap_mbox *mbox)
	384	{
	385	struct omap_mbox **tmp;
	386
	387	write_lock(&mboxes_lock);
	388	tmp = &mboxes;
	389	while (*tmp) {
	390	if (mbox == *tmp) {
	391	*tmp = mbox->next;
	392	mbox->next = NULL;
	393	write_unlock(&mboxes_lock);
	394	return 0;
	395	}
	396	tmp = &(*tmp)->next;
	397	}
	398	write_unlock(&mboxes_lock);
	399
	400	return -EINVAL;
	401	}
	402	EXPORT_SYMBOL(omap_mbox_unregister);
	403
c7c158e5	404	static int __init omap_mbox_init(void)
340a614a	405	{
8250a5c3 RC	406	mboxd = create_workqueue("mboxd");
	407	if (!mboxd)
	408	return -ENOMEM;
	409
c7c158e5	410	return 0;
340a614a	411	}
c7c158e5	412	module_init(omap_mbox_init);
340a614a	413
c7c158e5	414	static void __exit omap_mbox_exit(void)
340a614a	415	{
8250a5c3	416	destroy_workqueue(mboxd);
340a614a	417	}
c7c158e5	418	module_exit(omap_mbox_exit);
340a614a	419
f48cca87 HD	420	MODULE_LICENSE("GPL v2");
	421	MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
	422	MODULE_AUTHOR("Toshihiro Kobayashi and Hiroshi DOYU");