[net-next-2.6.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/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mutex.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
340a614a	24	#include <linux/interrupt.h>
b3e69146 FC	25	#include <linux/spinlock.h>
b3e69146 FC	26	#include <linux/mutex.h>
340a614a	27	#include <linux/delay.h>
5a0e3ad6	28	#include <linux/slab.h>
b5bebe41 OBC	29	#include <linux/kfifo.h>
b5bebe41 OBC	30	#include <linux/err.h>
8dff0fa5	31
ce491cf8	32	#include <plat/mailbox.h>
340a614a	33
8250a5c3	34	static struct workqueue_struct *mboxd;
9c80c8cd	35	static struct omap_mbox **mboxes;
1ea5d6d1	36	static bool rq_full;
340a614a	37
5f00ec64	38	static int mbox_configured;
72b917ef	39	static DEFINE_MUTEX(mbox_configured_lock);
5f00ec64	40
b5bebe41 OBC	41	static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
	42	module_param(mbox_kfifo_size, uint, S_IRUGO);
	43	MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");
	44
9ae0ee00 HD	45	/* Mailbox FIFO handle functions */
	46	static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
	47	{
	48	return mbox->ops->fifo_read(mbox);
	49	}
	50	static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
	51	{
	52	mbox->ops->fifo_write(mbox, msg);
	53	}
	54	static inline int mbox_fifo_empty(struct omap_mbox *mbox)
	55	{
	56	return mbox->ops->fifo_empty(mbox);
	57	}
	58	static inline int mbox_fifo_full(struct omap_mbox *mbox)
	59	{
	60	return mbox->ops->fifo_full(mbox);
	61	}
	62
	63	/* Mailbox IRQ handle functions */
9ae0ee00 HD	64	static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	65	{
	66	if (mbox->ops->ack_irq)
	67	mbox->ops->ack_irq(mbox, irq);
	68	}
	69	static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	70	{
	71	return mbox->ops->is_irq(mbox, irq);
	72	}
	73
340a614a HD	74	/*
	75	* message sender
	76	*/
b5bebe41	77	static int __mbox_poll_for_space(struct omap_mbox *mbox)
340a614a HD	78	{
	79	int ret = 0, i = 1000;
	80
	81	while (mbox_fifo_full(mbox)) {
	82	if (mbox->ops->type == OMAP_MBOX_TYPE2)
	83	return -1;
	84	if (--i == 0)
	85	return -1;
	86	udelay(1);
	87	}
340a614a HD	88	return ret;
	89	}
	90
b2b6362e	91	int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
340a614a	92	{
b5bebe41 OBC	93	struct omap_mbox_queue *mq = mbox->txq;
b5bebe41 OBC	94	int ret = 0, len;
5ed8d32e	95
b5bebe41	96	spin_lock(&mq->lock);
ec24751a	97
b5bebe41 OBC	98	if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
	99	ret = -ENOMEM;
	100	goto out;
	101	}
	102
	103	len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
	104	WARN_ON(len != sizeof(msg));
340a614a	105
5ed8d32e	106	tasklet_schedule(&mbox->txq->tasklet);
340a614a	107
b5bebe41 OBC	108	out:
	109	spin_unlock(&mq->lock);
	110	return ret;
340a614a HD	111	}
	112	EXPORT_SYMBOL(omap_mbox_msg_send);
	113
5ed8d32e	114	static void mbox_tx_tasklet(unsigned long tx_data)
340a614a	115	{
5ed8d32e	116	struct omap_mbox mbox = (struct omap_mbox )tx_data;
b5bebe41 OBC	117	struct omap_mbox_queue *mq = mbox->txq;
	118	mbox_msg_t msg;
	119	int ret;
340a614a	120
b5bebe41 OBC	121	while (kfifo_len(&mq->fifo)) {
b5bebe41 OBC	122	if (__mbox_poll_for_space(mbox)) {
eb18858e	123	omap_mbox_enable_irq(mbox, IRQ_TX);
b5bebe41	124	break;
340a614a	125	}
b5bebe41 OBC	126
	127	ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
	128	sizeof(msg));
	129	WARN_ON(ret != sizeof(msg));
	130
	131	mbox_fifo_write(mbox, msg);
340a614a HD	132	}
	133	}
	134
	135	/*
	136	* Message receiver(workqueue)
	137	*/
	138	static void mbox_rx_work(struct work_struct *work)
	139	{
	140	struct omap_mbox_queue *mq =
	141	container_of(work, struct omap_mbox_queue, work);
340a614a	142	mbox_msg_t msg;
b5bebe41 OBC	143	int len;
	144
	145	while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
	146	len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
	147	WARN_ON(len != sizeof(msg));
340a614a	148
b5bebe41 OBC	149	if (mq->callback)
b5bebe41 OBC	150	mq->callback((void *)msg);
340a614a HD	151	}
	152	}
	153
	154	/*
	155	* Mailbox interrupt handler
	156	*/
340a614a HD	157	static void __mbox_tx_interrupt(struct omap_mbox *mbox)
340a614a HD	158	{
eb18858e	159	omap_mbox_disable_irq(mbox, IRQ_TX);
340a614a	160	ack_mbox_irq(mbox, IRQ_TX);
5ed8d32e	161	tasklet_schedule(&mbox->txq->tasklet);
340a614a HD	162	}
	163
	164	static void __mbox_rx_interrupt(struct omap_mbox *mbox)
	165	{
b5bebe41	166	struct omap_mbox_queue *mq = mbox->rxq;
340a614a	167	mbox_msg_t msg;
b5bebe41	168	int len;
340a614a	169
340a614a	170	while (!mbox_fifo_empty(mbox)) {
b5bebe41	171	if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
1ea5d6d1 FGL	172	omap_mbox_disable_irq(mbox, IRQ_RX);
1ea5d6d1 FGL	173	rq_full = true;
340a614a	174	goto nomem;
1ea5d6d1	175	}
340a614a HD	176
340a614a HD	177	msg = mbox_fifo_read(mbox);
340a614a	178
b5bebe41 OBC	179	len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
b5bebe41 OBC	180	WARN_ON(len != sizeof(msg));
340a614a	181
340a614a HD	182	if (mbox->ops->type == OMAP_MBOX_TYPE1)
	183	break;
	184	}
	185
	186	/* no more messages in the fifo. clear IRQ source. */
	187	ack_mbox_irq(mbox, IRQ_RX);
f48cca87	188	nomem:
8250a5c3	189	queue_work(mboxd, &mbox->rxq->work);
340a614a HD	190	}
	191
	192	static irqreturn_t mbox_interrupt(int irq, void *p)
	193	{
2a7057e3	194	struct omap_mbox *mbox = p;
340a614a HD	195
	196	if (is_mbox_irq(mbox, IRQ_TX))
	197	__mbox_tx_interrupt(mbox);
	198
	199	if (is_mbox_irq(mbox, IRQ_RX))
	200	__mbox_rx_interrupt(mbox);
	201
	202	return IRQ_HANDLED;
	203	}
	204
340a614a	205	static struct omap_mbox_queue mbox_queue_alloc(struct omap_mbox mbox,
5ed8d32e S	206	void (work) (struct work_struct ),
5ed8d32e S	207	void (*tasklet)(unsigned long))
340a614a	208	{
340a614a HD	209	struct omap_mbox_queue *mq;
	210
	211	mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
	212	if (!mq)
	213	return NULL;
	214
	215	spin_lock_init(&mq->lock);
	216
b5bebe41	217	if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
340a614a	218	goto error;
340a614a	219
5ed8d32e S	220	if (work)
5ed8d32e S	221	INIT_WORK(&mq->work, work);
340a614a	222
5ed8d32e S	223	if (tasklet)
5ed8d32e S	224	tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
340a614a HD	225	return mq;
	226	error:
	227	kfree(mq);
	228	return NULL;
	229	}
	230
	231	static void mbox_queue_free(struct omap_mbox_queue *q)
	232	{
b5bebe41	233	kfifo_free(&q->fifo);
340a614a HD	234	kfree(q);
	235	}
	236
c7c158e5	237	static int omap_mbox_startup(struct omap_mbox *mbox)
340a614a	238	{
5f00ec64	239	int ret = 0;
340a614a HD	240	struct omap_mbox_queue *mq;
340a614a HD	241
01072d8f	242	if (mbox->ops->startup) {
72b917ef	243	mutex_lock(&mbox_configured_lock);
5f00ec64 S	244	if (!mbox_configured)
	245	ret = mbox->ops->startup(mbox);
	246
01072d8f	247	if (ret) {
72b917ef	248	mutex_unlock(&mbox_configured_lock);
340a614a	249	return ret;
5f00ec64 S	250	}
5f00ec64 S	251	mbox_configured++;
72b917ef	252	mutex_unlock(&mbox_configured_lock);
340a614a HD	253	}
340a614a HD	254
5e683825	255	ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
340a614a	256	mbox->name, mbox);
01072d8f	257	if (ret) {
340a614a HD	258	printk(KERN_ERR
	259	"failed to register mailbox interrupt:%d\n", ret);
	260	goto fail_request_irq;
	261	}
340a614a	262
b5bebe41	263	mq = mbox_queue_alloc(mbox, NULL, mbox_tx_tasklet);
340a614a HD	264	if (!mq) {
	265	ret = -ENOMEM;
	266	goto fail_alloc_txq;
	267	}
	268	mbox->txq = mq;
	269
b5bebe41	270	mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
340a614a HD	271	if (!mq) {
	272	ret = -ENOMEM;
	273	goto fail_alloc_rxq;
	274	}
	275	mbox->rxq = mq;
	276
	277	return 0;
	278
	279	fail_alloc_rxq:
	280	mbox_queue_free(mbox->txq);
	281	fail_alloc_txq:
	282	free_irq(mbox->irq, mbox);
	283	fail_request_irq:
01072d8f	284	if (mbox->ops->shutdown)
340a614a HD	285	mbox->ops->shutdown(mbox);
	286
	287	return ret;
	288	}
	289
	290	static void omap_mbox_fini(struct omap_mbox *mbox)
	291	{
ad6d9627	292	free_irq(mbox->irq, mbox);
0e828e8c FGL	293	tasklet_kill(&mbox->txq->tasklet);
0e828e8c FGL	294	flush_work(&mbox->rxq->work);
340a614a HD	295	mbox_queue_free(mbox->txq);
	296	mbox_queue_free(mbox->rxq);
	297
01072d8f	298	if (mbox->ops->shutdown) {
72b917ef	299	mutex_lock(&mbox_configured_lock);
5f00ec64 S	300	if (mbox_configured > 0)
	301	mbox_configured--;
	302	if (!mbox_configured)
	303	mbox->ops->shutdown(mbox);
72b917ef	304	mutex_unlock(&mbox_configured_lock);
5f00ec64	305	}
340a614a HD	306	}
340a614a HD	307
340a614a HD	308	struct omap_mbox omap_mbox_get(const char name)
	309	{
	310	struct omap_mbox *mbox;
	311	int ret;
	312
9c80c8cd FC	313	if (!mboxes)
9c80c8cd FC	314	return ERR_PTR(-EINVAL);
340a614a	315
9c80c8cd FC	316	for (mbox = *mboxes; mbox; mbox++)
	317	if (!strcmp(mbox->name, name))
	318	break;
	319
	320	if (!mbox)
	321	return ERR_PTR(-ENOENT);
340a614a	322
c7c158e5	323	ret = omap_mbox_startup(mbox);
340a614a HD	324	if (ret)
	325	return ERR_PTR(-ENODEV);
	326
	327	return mbox;
	328	}
	329	EXPORT_SYMBOL(omap_mbox_get);
	330
	331	void omap_mbox_put(struct omap_mbox *mbox)
	332	{
	333	omap_mbox_fini(mbox);
	334	}
	335	EXPORT_SYMBOL(omap_mbox_put);
	336
6b233985 HD	337	static struct class omap_mbox_class = { .name = "mbox", };
6b233985 HD	338
9c80c8cd	339	int omap_mbox_register(struct device parent, struct omap_mbox *list)
340a614a	340	{
9c80c8cd FC	341	int ret;
9c80c8cd FC	342	int i;
340a614a	343
9c80c8cd FC	344	mboxes = list;
9c80c8cd FC	345	if (!mboxes)
340a614a	346	return -EINVAL;
340a614a	347
9c80c8cd FC	348	for (i = 0; mboxes[i]; i++) {
	349	struct omap_mbox *mbox = mboxes[i];
	350	mbox->dev = device_create(&omap_mbox_class,
	351	parent, 0, mbox, "%s", mbox->name);
	352	if (IS_ERR(mbox->dev)) {
	353	ret = PTR_ERR(mbox->dev);
	354	goto err_out;
	355	}
	356	}
f48cca87 HD	357	return 0;
f48cca87 HD	358
9c80c8cd FC	359	err_out:
	360	while (i--)
	361	device_unregister(mboxes[i]->dev);
340a614a HD	362	return ret;
	363	}
	364	EXPORT_SYMBOL(omap_mbox_register);
	365
9c80c8cd	366	int omap_mbox_unregister(void)
340a614a	367	{
9c80c8cd	368	int i;
340a614a	369
9c80c8cd FC	370	if (!mboxes)
	371	return -EINVAL;
	372
	373	for (i = 0; mboxes[i]; i++)
	374	device_unregister(mboxes[i]->dev);
	375	mboxes = NULL;
	376	return 0;
340a614a HD	377	}
	378	EXPORT_SYMBOL(omap_mbox_unregister);
	379
c7c158e5	380	static int __init omap_mbox_init(void)
340a614a	381	{
6b233985 HD	382	int err;
	383
	384	err = class_register(&omap_mbox_class);
	385	if (err)
	386	return err;
	387
8250a5c3 RC	388	mboxd = create_workqueue("mboxd");
	389	if (!mboxd)
	390	return -ENOMEM;
	391
b5bebe41 OBC	392	/* kfifo size sanity check: alignment and minimal size */
	393	mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
	394	mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size, sizeof(mbox_msg_t));
	395
c7c158e5	396	return 0;
340a614a	397	}
6b233985	398	subsys_initcall(omap_mbox_init);
340a614a	399
c7c158e5	400	static void __exit omap_mbox_exit(void)
340a614a	401	{
8250a5c3	402	destroy_workqueue(mboxd);
6b233985	403	class_unregister(&omap_mbox_class);
340a614a	404	}
c7c158e5	405	module_exit(omap_mbox_exit);
340a614a	406
f48cca87 HD	407	MODULE_LICENSE("GPL v2");
f48cca87 HD	408	MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
f375325a OBC	409	MODULE_AUTHOR("Toshihiro Kobayashi");
f375325a OBC	410	MODULE_AUTHOR("Hiroshi DOYU");