Message-ID: <1403660878-56350-5-git-send-email-s-anna@ti.com>
Date:	Tue, 24 Jun 2014 20:47:56 -0500
From:	Suman Anna <s-anna@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Jassi Brar <jaswinder.singh@...aro.org>,
	Dave Gerlach <d-gerlach@...com>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, Suman Anna <s-anna@...com>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Omar Ramirez Luna <omar.ramirez@...itl.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 4/6] mailbox/omap: adapt to the new mailbox framework

The OMAP mailbox driver and its existing clients (remoteproc
for OMAP4+ and TI DSP/Bridge for OMAP3) are adapted to use
the generic mailbox framework.

The main changes for the adaptation are:
  - The tasklet used for Tx is replaced with the state machine from
    the generic mailbox framework. The workqueue used for processing
    the received messages stays intact for minimizing the effects on
    the OMAP mailbox clients.
  - The existing exported client API, omap_mbox_get, omap_mbox_put and
    omap_mbox_send_msg are deleted, as the framework provides equivalent
    functionality. A OMAP-specific omap_mbox_request_channel is added
    though to support non-DT way of requesting mailboxes for OMAP3.
  - The OMAP mailbox driver is integrated with the mailbox framework
    through the proper implementations of mbox_chan_ops, except for
    .last_tx_done and .peek_data. The OMAP mailbox driver does not need
    these ops, as it is completely interrupt driven.
  - The new framework does not support multiple clients operating on a
    single channel, so the reference counting logic is simplified.
  - The remoteproc and tidspbridge drivers (current clients) are adapted
    to use the new API. The notifier callbacks used within these clients
    are replaced with the regular callbacks from the newer framework.
  - The exported OMAP mailbox API are limited to omap_mbox_save_ctx,
    omap_mbox_restore_ctx, omap_mbox_enable_irq & omap_mbox_disable_irq,
    with the signature modified to take in the new mbox_chan handle instead
    of the OMAP specific omap_mbox handle. The first 2 will be removed when
    the OMAP mailbox driver is adapted to runtime_pm. The other exported
    API omap_mbox_request_channel is identical in signature to the framework
    API mbox_request_channel, and will be removed once OMAP3 becomes DT-boot
    only.

Cc: Jassi Brar <jassisinghbrar@...il.com>
Cc: Ohad Ben-Cohen <ohad@...ery.com>
Cc: Omar Ramirez Luna <omar.ramirez@...itl.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Suman Anna <s-anna@...com>
---
 drivers/mailbox/omap-mailbox.c                     | 320 +++++++++++----------
 drivers/remoteproc/omap_remoteproc.c               |  54 ++--
 drivers/staging/tidspbridge/core/_tiomap.h         |   3 +-
 drivers/staging/tidspbridge/core/io_sm.c           |   7 +-
 drivers/staging/tidspbridge/core/tiomap3430.c      |  22 +-
 drivers/staging/tidspbridge/core/tiomap_io.c       |   7 +-
 .../tidspbridge/include/dspbridge/host_os.h        |   1 +
 .../staging/tidspbridge/include/dspbridge/io_sm.h  |   8 +-
 include/linux/omap-mailbox.h                       |  15 +-
 9 files changed, 234 insertions(+), 203 deletions(-)

diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c
index c61435b..d71e84f 100644
--- a/drivers/mailbox/omap-mailbox.c
+++ b/drivers/mailbox/omap-mailbox.c
@@ -29,13 +29,14 @@
 #include <linux/slab.h>
 #include <linux/kfifo.h>
 #include <linux/err.h>
-#include <linux/notifier.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_data/mailbox-omap.h>
 #include <linux/omap-mailbox.h>
+#include <linux/mailbox_controller.h>
+#include <linux/mailbox_client.h>
 
 #define MAILBOX_REVISION		0x000
 #define MAILBOX_MESSAGE(m)		(0x040 + 4 * (m))
@@ -80,7 +81,6 @@ struct omap_mbox_queue {
 	spinlock_t		lock;
 	struct kfifo		fifo;
 	struct work_struct	work;
-	struct tasklet_struct	tasklet;
 	struct omap_mbox	*mbox;
 	bool full;
 };
@@ -92,6 +92,7 @@ struct omap_mbox_device {
 	u32 num_users;
 	u32 num_fifos;
 	struct omap_mbox **mboxes;
+	struct mbox_controller controller;
 	struct list_head elem;
 };
 
@@ -116,15 +117,14 @@ struct omap_mbox_device_data {
 struct omap_mbox {
 	const char		*name;
 	int			irq;
-	struct omap_mbox_queue	*txq, *rxq;
+	struct omap_mbox_queue	*rxq;
 	struct device		*dev;
 	struct omap_mbox_device *parent;
 	struct omap_mbox_fifo	tx_fifo;
 	struct omap_mbox_fifo	rx_fifo;
 	u32			ctx[OMAP4_MBOX_NR_REGS];
 	u32			intr_type;
-	int			use_count;
-	struct blocking_notifier_head	notifier;
+	struct mbox_chan	*chan;
 };
 
 /* global variables for the mailbox devices */
@@ -135,6 +135,14 @@ 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)");
 
+static struct omap_mbox *mbox_chan_to_omap_mbox(struct mbox_chan *chan)
+{
+	if (!chan || !chan->con_priv)
+		return NULL;
+
+	return (struct omap_mbox *)chan->con_priv;
+}
+
 static inline
 unsigned int mbox_read_reg(struct omap_mbox_device *mdev, size_t ofs)
 {
@@ -200,41 +208,14 @@ static int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 	return (int)(enable & status & bit);
 }
 
-/*
- * message sender
- */
-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_bh(&mq->lock);
-
-	if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
-	if (kfifo_is_empty(&mq->fifo) && !mbox_fifo_full(mbox)) {
-		mbox_fifo_write(mbox, msg);
-		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_bh(&mq->lock);
-	return ret;
-}
-EXPORT_SYMBOL(omap_mbox_msg_send);
-
-void omap_mbox_save_ctx(struct omap_mbox *mbox)
+void omap_mbox_save_ctx(struct mbox_chan *chan)
 {
 	int i;
 	int nr_regs;
+	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
+
+	if (WARN_ON(!mbox))
+		return;
 
 	if (mbox->intr_type)
 		nr_regs = OMAP4_MBOX_NR_REGS;
@@ -249,10 +230,14 @@ void omap_mbox_save_ctx(struct omap_mbox *mbox)
 }
 EXPORT_SYMBOL(omap_mbox_save_ctx);
 
-void omap_mbox_restore_ctx(struct omap_mbox *mbox)
+void omap_mbox_restore_ctx(struct mbox_chan *chan)
 {
 	int i;
 	int nr_regs;
+	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
+
+	if (WARN_ON(!mbox))
+		return;
 
 	if (mbox->intr_type)
 		nr_regs = OMAP4_MBOX_NR_REGS;
@@ -260,14 +245,13 @@ void omap_mbox_restore_ctx(struct omap_mbox *mbox)
 		nr_regs = MBOX_NR_REGS;
 	for (i = 0; i < nr_regs; i++) {
 		mbox_write_reg(mbox->parent, mbox->ctx[i], i * sizeof(u32));
-
 		dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
 			i, mbox->ctx[i]);
 	}
 }
 EXPORT_SYMBOL(omap_mbox_restore_ctx);
 
-void omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+static void _omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 {
 	u32 l;
 	struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
@@ -279,9 +263,8 @@ void omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 	l |= bit;
 	mbox_write_reg(mbox->parent, l, irqenable);
 }
-EXPORT_SYMBOL(omap_mbox_enable_irq);
 
-void omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
+static void _omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 {
 	struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
 				&mbox->tx_fifo : &mbox->rx_fifo;
@@ -297,28 +280,28 @@ void omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
 
 	mbox_write_reg(mbox->parent, bit, irqdisable);
 }
-EXPORT_SYMBOL(omap_mbox_disable_irq);
 
-static void mbox_tx_tasklet(unsigned long tx_data)
+void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
 {
-	struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
-	struct omap_mbox_queue *mq = mbox->txq;
-	mbox_msg_t msg;
-	int ret;
+	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
 
-	while (kfifo_len(&mq->fifo)) {
-		if (mbox_fifo_full(mbox)) {
-			omap_mbox_enable_irq(mbox, IRQ_TX);
-			break;
-		}
+	if (WARN_ON(!mbox))
+		return;
+
+	_omap_mbox_enable_irq(mbox, irq);
+}
+EXPORT_SYMBOL(omap_mbox_enable_irq);
 
-		ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
-								sizeof(msg));
-		WARN_ON(ret != sizeof(msg));
+void omap_mbox_disable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
+{
+	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
 
-		mbox_fifo_write(mbox, msg);
-	}
+	if (WARN_ON(!mbox))
+		return;
+
+	_omap_mbox_disable_irq(mbox, irq);
 }
+EXPORT_SYMBOL(omap_mbox_disable_irq);
 
 /*
  * Message receiver(workqueue)
@@ -334,12 +317,11 @@ static void mbox_rx_work(struct work_struct *work)
 		len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
 		WARN_ON(len != sizeof(msg));
 
-		blocking_notifier_call_chain(&mq->mbox->notifier, len,
-								(void *)msg);
+		mbox_chan_received_data(mq->mbox->chan, (void *)msg);
 		spin_lock_irq(&mq->lock);
 		if (mq->full) {
 			mq->full = false;
-			omap_mbox_enable_irq(mq->mbox, IRQ_RX);
+			_omap_mbox_enable_irq(mq->mbox, IRQ_RX);
 		}
 		spin_unlock_irq(&mq->lock);
 	}
@@ -350,9 +332,9 @@ static void mbox_rx_work(struct work_struct *work)
  */
 static void __mbox_tx_interrupt(struct omap_mbox *mbox)
 {
-	omap_mbox_disable_irq(mbox, IRQ_TX);
+	_omap_mbox_disable_irq(mbox, IRQ_TX);
 	ack_mbox_irq(mbox, IRQ_TX);
-	tasklet_schedule(&mbox->txq->tasklet);
+	mbox_chan_txdone(mbox->chan, 0);
 }
 
 static void __mbox_rx_interrupt(struct omap_mbox *mbox)
@@ -363,7 +345,7 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox)
 
 	while (!mbox_fifo_empty(mbox)) {
 		if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
-			omap_mbox_disable_irq(mbox, IRQ_RX);
+			_omap_mbox_disable_irq(mbox, IRQ_RX);
 			mq->full = true;
 			goto nomem;
 		}
@@ -394,11 +376,13 @@ static irqreturn_t mbox_interrupt(int irq, void *p)
 }
 
 static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
-					void (*work) (struct work_struct *),
-					void (*tasklet)(unsigned long))
+					void (*work)(struct work_struct *))
 {
 	struct omap_mbox_queue *mq;
 
+	if (!work)
+		return NULL;
+
 	mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
 	if (!mq)
 		return NULL;
@@ -408,12 +392,9 @@ static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
 	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);
+	INIT_WORK(&mq->work, work);
 	return mq;
+
 error:
 	kfree(mq);
 	return NULL;
@@ -429,71 +410,35 @@ static int omap_mbox_startup(struct omap_mbox *mbox)
 {
 	int ret = 0;
 	struct omap_mbox_queue *mq;
-	struct omap_mbox_device *mdev = mbox->parent;
 
-	mutex_lock(&mdev->cfg_lock);
-	ret = pm_runtime_get_sync(mdev->dev);
-	if (unlikely(ret < 0))
-		goto fail_startup;
-
-	if (!mbox->use_count++) {
-		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);
+	if (!mq)
+		return -ENOMEM;
+	mbox->rxq = mq;
+	mq->mbox = mbox;
+
+	ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
+			  mbox->name, mbox);
+	if (unlikely(ret)) {
+		pr_err("failed to register mailbox interrupt:%d\n", ret);
+		goto fail_request_irq;
+	}
 
-		mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
-		if (!mq) {
-			ret = -ENOMEM;
-			goto fail_alloc_rxq;
-		}
-		mbox->rxq = mq;
-		mq->mbox = mbox;
-		ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
-							mbox->name, mbox);
-		if (unlikely(ret)) {
-			pr_err("failed to register mailbox interrupt:%d\n",
-									ret);
-			goto fail_request_irq;
-		}
+	_omap_mbox_enable_irq(mbox, IRQ_RX);
 
-		omap_mbox_enable_irq(mbox, IRQ_RX);
-	}
-	mutex_unlock(&mdev->cfg_lock);
 	return 0;
 
 fail_request_irq:
 	mbox_queue_free(mbox->rxq);
-fail_alloc_rxq:
-	mbox_queue_free(mbox->txq);
-fail_alloc_txq:
-	pm_runtime_put_sync(mdev->dev);
-	mbox->use_count--;
-fail_startup:
-	mutex_unlock(&mdev->cfg_lock);
 	return ret;
 }
 
 static void omap_mbox_fini(struct omap_mbox *mbox)
 {
-	struct omap_mbox_device *mdev = mbox->parent;
-
-	mutex_lock(&mdev->cfg_lock);
-
-	if (!--mbox->use_count) {
-		omap_mbox_disable_irq(mbox, IRQ_RX);
-		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);
-	}
-
-	pm_runtime_put_sync(mdev->dev);
-
-	mutex_unlock(&mdev->cfg_lock);
+	_omap_mbox_disable_irq(mbox, IRQ_RX);
+	free_irq(mbox->irq, mbox);
+	flush_work(&mbox->rxq->work);
+	mbox_queue_free(mbox->rxq);
 }
 
 static struct omap_mbox *omap_mbox_device_find(struct omap_mbox_device *mdev,
@@ -515,42 +460,54 @@ static struct omap_mbox *omap_mbox_device_find(struct omap_mbox_device *mdev,
 	return mbox;
 }
 
-struct omap_mbox *omap_mbox_get(const char *name, struct notifier_block *nb)
+struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl)
 {
+	struct device *dev = cl->dev;
 	struct omap_mbox *mbox = NULL;
 	struct omap_mbox_device *mdev;
+	struct mbox_chan *chan;
+	unsigned long flags;
 	int ret;
 
+	if (!dev)
+		return ERR_PTR(-ENODEV);
+
+	if (dev->of_node) {
+		pr_err("%s: please use mbox_request_channel(), this API is supported only for OMAP non-DT usage\n",
+		       __func__);
+		return ERR_PTR(-ENODEV);
+	}
+
 	mutex_lock(&omap_mbox_devices_lock);
 	list_for_each_entry(mdev, &omap_mbox_devices, elem) {
-		mbox = omap_mbox_device_find(mdev, name);
+		mbox = omap_mbox_device_find(mdev, cl->chan_name);
 		if (mbox)
 			break;
 	}
 	mutex_unlock(&omap_mbox_devices_lock);
 
-	if (!mbox)
+	if (!mbox || !mbox->chan)
 		return ERR_PTR(-ENOENT);
 
-	if (nb)
-		blocking_notifier_chain_register(&mbox->notifier, nb);
+	chan = mbox->chan;
+	spin_lock_irqsave(&chan->lock, flags);
+	chan->msg_free = 0;
+	chan->msg_count = 0;
+	chan->active_req = NULL;
+	chan->cl = cl;
+	init_completion(&chan->tx_complete);
+	spin_unlock_irqrestore(&chan->lock, flags);
 
-	ret = omap_mbox_startup(mbox);
+	ret = chan->mbox->ops->startup(chan);
 	if (ret) {
-		blocking_notifier_chain_unregister(&mbox->notifier, nb);
-		return ERR_PTR(-ENODEV);
+		pr_err("Unable to startup the chan (%d)\n", ret);
+		mbox_free_channel(chan);
+		chan = ERR_PTR(ret);
 	}
 
-	return mbox;
+	return chan;
 }
-EXPORT_SYMBOL(omap_mbox_get);
-
-void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb)
-{
-	blocking_notifier_chain_unregister(&mbox->notifier, nb);
-	omap_mbox_fini(mbox);
-}
-EXPORT_SYMBOL(omap_mbox_put);
+EXPORT_SYMBOL(omap_mbox_request_channel);
 
 static struct class omap_mbox_class = { .name = "mbox", };
 
@@ -566,25 +523,25 @@ static int omap_mbox_register(struct omap_mbox_device *mdev)
 	mboxes = mdev->mboxes;
 	for (i = 0; mboxes[i]; i++) {
 		struct omap_mbox *mbox = mboxes[i];
-		mbox->dev = device_create(&omap_mbox_class,
-				mdev->dev, 0, mbox, "%s", mbox->name);
+		mbox->dev = device_create(&omap_mbox_class, mdev->dev,
+					0, mbox, "%s", mbox->name);
 		if (IS_ERR(mbox->dev)) {
 			ret = PTR_ERR(mbox->dev);
 			goto err_out;
 		}
-
-		BLOCKING_INIT_NOTIFIER_HEAD(&mbox->notifier);
 	}
 
 	mutex_lock(&omap_mbox_devices_lock);
 	list_add(&mdev->elem, &omap_mbox_devices);
 	mutex_unlock(&omap_mbox_devices_lock);
 
-	return 0;
+	ret = mbox_controller_register(&mdev->controller);
 
 err_out:
-	while (i--)
-		device_unregister(mboxes[i]->dev);
+	if (ret) {
+		while (i--)
+			device_unregister(mboxes[i]->dev);
+	}
 	return ret;
 }
 
@@ -600,12 +557,64 @@ static int omap_mbox_unregister(struct omap_mbox_device *mdev)
 	list_del(&mdev->elem);
 	mutex_unlock(&omap_mbox_devices_lock);
 
+	mbox_controller_unregister(&mdev->controller);
+
 	mboxes = mdev->mboxes;
 	for (i = 0; mboxes[i]; i++)
 		device_unregister(mboxes[i]->dev);
 	return 0;
 }
 
+static int omap_mbox_chan_startup(struct mbox_chan *chan)
+{
+	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
+	struct omap_mbox_device *mdev = mbox->parent;
+	int ret = 0;
+
+	mutex_lock(&mdev->cfg_lock);
+	pm_runtime_get_sync(mdev->dev);
+	ret = omap_mbox_startup(mbox);
+	if (ret)
+		pm_runtime_put_sync(mdev->dev);
+	mutex_unlock(&mdev->cfg_lock);
+	return ret;
+}
+
+static void omap_mbox_chan_shutdown(struct mbox_chan *chan)
+{
+	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
+	struct omap_mbox_device *mdev = mbox->parent;
+
+	mutex_lock(&mdev->cfg_lock);
+	omap_mbox_fini(mbox);
+	pm_runtime_put_sync(mdev->dev);
+	mutex_unlock(&mdev->cfg_lock);
+}
+
+static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
+{
+	struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
+	int ret = -EBUSY;
+
+	if (!mbox)
+		return -EINVAL;
+
+	if (!mbox_fifo_full(mbox)) {
+		mbox_fifo_write(mbox, (mbox_msg_t)data);
+		ret = 0;
+	}
+
+	/* always enable the interrupt */
+	_omap_mbox_enable_irq(mbox, IRQ_TX);
+	return ret;
+}
+
+static struct mbox_chan_ops omap_mbox_chan_ops = {
+	.startup        = omap_mbox_chan_startup,
+	.send_data      = omap_mbox_chan_send_data,
+	.shutdown       = omap_mbox_chan_shutdown,
+};
+
 static const struct omap_mbox_device_data omap2_data = {
 	.num_users	= 4,
 	.num_fifos	= 6,
@@ -671,6 +680,7 @@ static int omap_mbox_probe(struct platform_device *pdev)
 {
 	struct resource *mem;
 	int ret;
+	struct mbox_chan *chnls;
 	struct omap_mbox **list, *mbox, *mboxblk;
 	struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
 	struct omap_mbox_dev_info *info = NULL;
@@ -772,6 +782,11 @@ static int omap_mbox_probe(struct platform_device *pdev)
 	if (!list)
 		return -ENOMEM;
 
+	chnls = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*chnls),
+			     GFP_KERNEL);
+	if (!chnls)
+		return -ENOMEM;
+
 	mboxblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*mbox),
 			       GFP_KERNEL);
 	if (!mboxblk)
@@ -803,6 +818,8 @@ static int omap_mbox_probe(struct platform_device *pdev)
 		mbox->irq = platform_get_irq(pdev, finfo->tx_irq);
 		if (mbox->irq < 0)
 			return mbox->irq;
+		mbox->chan = &chnls[i];
+		chnls[i].con_priv = mbox;
 		list[i] = mbox++;
 	}
 
@@ -811,6 +828,13 @@ static int omap_mbox_probe(struct platform_device *pdev)
 	mdev->num_users = num_users;
 	mdev->num_fifos = num_fifos;
 	mdev->mboxes = list;
+
+	/* OMAP does not have a Tx-Done IRQ, but rather a Tx-Ready IRQ */
+	mdev->controller.txdone_irq = true;
+	mdev->controller.dev = mdev->dev;
+	mdev->controller.ops = &omap_mbox_chan_ops;
+	mdev->controller.chans = chnls;
+	mdev->controller.num_chans = info_count;
 	ret = omap_mbox_register(mdev);
 	if (ret)
 		return ret;
diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
index 5168972..0a87e57 100644
--- a/drivers/remoteproc/omap_remoteproc.c
+++ b/drivers/remoteproc/omap_remoteproc.c
@@ -27,6 +27,7 @@
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/remoteproc.h>
+#include <linux/mailbox_client.h>
 #include <linux/omap-mailbox.h>
 
 #include <linux/platform_data/remoteproc-omap.h>
@@ -36,20 +37,19 @@
 
 /**
  * struct omap_rproc - omap remote processor state
- * @mbox: omap mailbox handle
- * @nb: notifier block that will be invoked on inbound mailbox messages
+ * @mbox: mailbox channel handle
+ * @client: mailbox client to request the mailbox channel
  * @rproc: rproc handle
  */
 struct omap_rproc {
-	struct omap_mbox *mbox;
-	struct notifier_block nb;
+	struct mbox_chan *mbox;
+	struct mbox_client client;
 	struct rproc *rproc;
 };
 
 /**
  * omap_rproc_mbox_callback() - inbound mailbox message handler
- * @this: notifier block
- * @index: unused
+ * @client: mailbox client pointer used for requesting the mailbox channel
  * @data: mailbox payload
  *
  * This handler is invoked by omap's mailbox driver whenever a mailbox
@@ -61,13 +61,13 @@ struct omap_rproc {
  * that indicates different events. Those values are deliberately very
  * big so they don't coincide with virtqueue indices.
  */
-static int omap_rproc_mbox_callback(struct notifier_block *this,
-					unsigned long index, void *data)
+static void omap_rproc_mbox_callback(struct mbox_client *client, void *data)
 {
-	mbox_msg_t msg = (mbox_msg_t) data;
-	struct omap_rproc *oproc = container_of(this, struct omap_rproc, nb);
+	struct omap_rproc *oproc = container_of(client, struct omap_rproc,
+						client);
 	struct device *dev = oproc->rproc->dev.parent;
 	const char *name = oproc->rproc->name;
+	u32 msg = (u32)data;
 
 	dev_dbg(dev, "mbox msg: 0x%x\n", msg);
 
@@ -84,8 +84,6 @@ static int omap_rproc_mbox_callback(struct notifier_block *this,
 		if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
 			dev_dbg(dev, "no message was found in vqid %d\n", msg);
 	}
-
-	return NOTIFY_DONE;
 }
 
 /* kick a virtqueue */
@@ -96,8 +94,8 @@ static void omap_rproc_kick(struct rproc *rproc, int vqid)
 	int ret;
 
 	/* send the index of the triggered virtqueue in the mailbox payload */
-	ret = omap_mbox_msg_send(oproc->mbox, vqid);
-	if (ret)
+	ret = mbox_send_message(oproc->mbox, (void *)vqid);
+	if (ret < 0)
 		dev_err(dev, "omap_mbox_msg_send failed: %d\n", ret);
 }
 
@@ -115,17 +113,25 @@ static int omap_rproc_start(struct rproc *rproc)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
 	int ret;
+	struct mbox_client *client = &oproc->client;
+	char client_name[32];
 
 	if (pdata->set_bootaddr)
 		pdata->set_bootaddr(rproc->bootaddr);
 
-	oproc->nb.notifier_call = omap_rproc_mbox_callback;
+	client->dev = dev;
+	client->tx_done = NULL;
+	client->rx_callback = omap_rproc_mbox_callback;
+	client->tx_block = false;
+	client->knows_txdone = false;
+	sprintf(client_name, "%s", pdata->mbox_name);
+	client->chan_name = client_name;
 
-	/* every omap rproc is assigned a mailbox instance for messaging */
-	oproc->mbox = omap_mbox_get(pdata->mbox_name, &oproc->nb);
+	oproc->mbox = omap_mbox_request_channel(client);
 	if (IS_ERR(oproc->mbox)) {
-		ret = PTR_ERR(oproc->mbox);
-		dev_err(dev, "omap_mbox_get failed: %d\n", ret);
+		ret = -EBUSY;
+		dev_err(dev, "mbox_request_channel failed: %ld\n",
+			PTR_ERR(oproc->mbox));
 		return ret;
 	}
 
@@ -136,9 +142,9 @@ static int omap_rproc_start(struct rproc *rproc)
 	 * Note that the reply will _not_ arrive immediately: this message
 	 * will wait in the mailbox fifo until the remote processor is booted.
 	 */
-	ret = omap_mbox_msg_send(oproc->mbox, RP_MBOX_ECHO_REQUEST);
-	if (ret) {
-		dev_err(dev, "omap_mbox_get failed: %d\n", ret);
+	ret = mbox_send_message(oproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
+	if (ret < 0) {
+		dev_err(dev, "mbox_send_message failed: %d\n", ret);
 		goto put_mbox;
 	}
 
@@ -151,7 +157,7 @@ static int omap_rproc_start(struct rproc *rproc)
 	return 0;
 
 put_mbox:
-	omap_mbox_put(oproc->mbox, &oproc->nb);
+	mbox_free_channel(oproc->mbox);
 	return ret;
 }
 
@@ -168,7 +174,7 @@ static int omap_rproc_stop(struct rproc *rproc)
 	if (ret)
 		return ret;
 
-	omap_mbox_put(oproc->mbox, &oproc->nb);
+	mbox_free_channel(oproc->mbox);
 
 	return 0;
 }
diff --git a/drivers/staging/tidspbridge/core/_tiomap.h b/drivers/staging/tidspbridge/core/_tiomap.h
index 65971b7..2b8390f 100644
--- a/drivers/staging/tidspbridge/core/_tiomap.h
+++ b/drivers/staging/tidspbridge/core/_tiomap.h
@@ -338,7 +338,8 @@ struct bridge_dev_context {
 	u32 dsp_start_add;	/* API Boot vector */
 	u32 internal_size;	/* Internal memory size */
 
-	struct omap_mbox *mbox;		/* Mail box handle */
+	struct mbox_client client;	/* Mailbox Client */
+	struct mbox_chan *mbox;		/* Mailbox handle */
 
 	struct cfg_hostres *resources;	/* Host Resources */
 
diff --git a/drivers/staging/tidspbridge/core/io_sm.c b/drivers/staging/tidspbridge/core/io_sm.c
index c2829aa..4b6673a 100644
--- a/drivers/staging/tidspbridge/core/io_sm.c
+++ b/drivers/staging/tidspbridge/core/io_sm.c
@@ -908,7 +908,7 @@ func_end:
  *      Calls the Bridge's CHNL_ISR to determine if this interrupt is ours, then
  *      schedules a DPC to dispatch I/O.
  */
-int io_mbox_msg(struct notifier_block *self, unsigned long len, void *msg)
+void io_mbox_msg(struct mbox_client *client, void *msg)
 {
 	struct io_mgr *pio_mgr;
 	struct dev_object *dev_obj;
@@ -917,8 +917,8 @@ int io_mbox_msg(struct notifier_block *self, unsigned long len, void *msg)
 	dev_obj = dev_get_first();
 	dev_get_io_mgr(dev_obj, &pio_mgr);
 
-	if (!pio_mgr)
-		return NOTIFY_BAD;
+	if (WARN_ON(!pio_mgr))
+		return;
 
 	pio_mgr->intr_val = (u16)((u32)msg);
 	if (pio_mgr->intr_val & MBX_PM_CLASS)
@@ -932,7 +932,6 @@ int io_mbox_msg(struct notifier_block *self, unsigned long len, void *msg)
 		spin_unlock_irqrestore(&pio_mgr->dpc_lock, flags);
 		tasklet_schedule(&pio_mgr->dpc_tasklet);
 	}
-	return NOTIFY_OK;
 }
 
 /*
diff --git a/drivers/staging/tidspbridge/core/tiomap3430.c b/drivers/staging/tidspbridge/core/tiomap3430.c
index 8945b4e..5f6287c 100644
--- a/drivers/staging/tidspbridge/core/tiomap3430.c
+++ b/drivers/staging/tidspbridge/core/tiomap3430.c
@@ -212,10 +212,6 @@ static struct bridge_drv_interface drv_interface_fxns = {
 	bridge_msg_set_queue_id,
 };
 
-static struct notifier_block dsp_mbox_notifier = {
-	.notifier_call = io_mbox_msg,
-};
-
 static inline void flush_all(struct bridge_dev_context *dev_context)
 {
 	if (dev_context->brd_state == BRD_DSP_HIBERNATION ||
@@ -378,6 +374,8 @@ static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
 	u32 wdt_en = 0;
 	struct omap_dsp_platform_data *pdata =
 		omap_dspbridge_dev->dev.platform_data;
+	struct mbox_client *client = &dev_context->client;
+	char mbox_user_name[32];
 
 	/* The device context contains all the mmu setup info from when the
 	 * last dsp base image was loaded. The first entry is always
@@ -544,11 +542,17 @@ static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
 		 * Enable Mailbox events and also drain any pending
 		 * stale messages.
 		 */
-		dev_context->mbox = omap_mbox_get("dsp", &dsp_mbox_notifier);
+		client->dev = &omap_dspbridge_dev->dev;
+		client->tx_done = NULL;
+		client->rx_callback = io_mbox_msg;
+		client->tx_block = false;
+		client->knows_txdone = false;
+		sprintf(mbox_user_name, "dsp");
+		client->chan_name = mbox_user_name;
+		dev_context->mbox = omap_mbox_request_channel(client);
 		if (IS_ERR(dev_context->mbox)) {
-			dev_context->mbox = NULL;
-			pr_err("%s: Failed to get dsp mailbox handle\n",
-								__func__);
+			pr_err("%s: Failed to get dsp mailbox handle, ret = %ld\n",
+			       __func__, PTR_ERR(dev_context->mbox));
 			status = -EPERM;
 		}
 
@@ -680,7 +684,7 @@ static int bridge_brd_stop(struct bridge_dev_context *dev_ctxt)
 	/* Disable the mailbox interrupts */
 	if (dev_context->mbox) {
 		omap_mbox_disable_irq(dev_context->mbox, IRQ_RX);
-		omap_mbox_put(dev_context->mbox, &dsp_mbox_notifier);
+		mbox_free_channel(dev_context->mbox);
 		dev_context->mbox = NULL;
 	}
 	/* Reset IVA2 clocks*/
diff --git a/drivers/staging/tidspbridge/core/tiomap_io.c b/drivers/staging/tidspbridge/core/tiomap_io.c
index f53ed98..fe86035 100644
--- a/drivers/staging/tidspbridge/core/tiomap_io.c
+++ b/drivers/staging/tidspbridge/core/tiomap_io.c
@@ -427,10 +427,9 @@ int sm_interrupt_dsp(struct bridge_dev_context *dev_context, u16 mb_val)
 		dsp_clock_enable_all(dev_context->dsp_per_clks);
 	}
 
-	status = omap_mbox_msg_send(dev_context->mbox, mb_val);
-
-	if (status) {
-		pr_err("omap_mbox_msg_send Fail and status = %d\n", status);
+	status = mbox_send_message(dev_context->mbox, (void *)((u32)mb_val));
+	if (status < 0) {
+		pr_err("mbox_send_message failed, status = %d\n", status);
 		status = -EPERM;
 	}
 
diff --git a/drivers/staging/tidspbridge/include/dspbridge/host_os.h b/drivers/staging/tidspbridge/include/dspbridge/host_os.h
index d1441db..8ddef2b 100644
--- a/drivers/staging/tidspbridge/include/dspbridge/host_os.h
+++ b/drivers/staging/tidspbridge/include/dspbridge/host_os.h
@@ -42,6 +42,7 @@
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/omap-mailbox.h>
+#include <linux/mailbox_client.h>
 #include <linux/pagemap.h>
 #include <asm/cacheflush.h>
 #include <linux/dma-mapping.h>
diff --git a/drivers/staging/tidspbridge/include/dspbridge/io_sm.h b/drivers/staging/tidspbridge/include/dspbridge/io_sm.h
index 903ff12..b185d6e 100644
--- a/drivers/staging/tidspbridge/include/dspbridge/io_sm.h
+++ b/drivers/staging/tidspbridge/include/dspbridge/io_sm.h
@@ -80,13 +80,11 @@ extern void io_dpc(unsigned long ref_data);
  *	Determine if this message is ours, then schedules a DPC to
  *	dispatch I/O.
  *  Parameters:
- *	self:	Pointer to its own notifier_block struct.
- *	len:	Length of message.
- *	msg:	Message code received.
+ *	client:	 Mailbox Client handle registered with the mailbox core.
+ *	msg:	 Message code received.
  *  Returns:
- *	NOTIFY_OK if handled; NOTIFY_BAD otherwise.
  */
-int io_mbox_msg(struct notifier_block *self, unsigned long len, void *msg);
+void io_mbox_msg(struct mbox_client *client, void *msg);
 
 /*
  *  ======== io_request_chnl ========
diff --git a/include/linux/omap-mailbox.h b/include/linux/omap-mailbox.h
index f8322d9..fee452c 100644
--- a/include/linux/omap-mailbox.h
+++ b/include/linux/omap-mailbox.h
@@ -10,20 +10,19 @@
 #define OMAP_MAILBOX_H
 
 typedef u32 mbox_msg_t;
-struct omap_mbox;
 
 typedef int __bitwise omap_mbox_irq_t;
 #define IRQ_TX ((__force omap_mbox_irq_t) 1)
 #define IRQ_RX ((__force omap_mbox_irq_t) 2)
 
-int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
+struct mbox_chan;
+struct mbox_client;
 
-struct omap_mbox *omap_mbox_get(const char *, struct notifier_block *nb);
-void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb);
+struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl);
 
-void omap_mbox_save_ctx(struct omap_mbox *mbox);
-void omap_mbox_restore_ctx(struct omap_mbox *mbox);
-void omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq);
-void omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq);
+void omap_mbox_save_ctx(struct mbox_chan *chan);
+void omap_mbox_restore_ctx(struct mbox_chan *chan);
+void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq);
+void omap_mbox_disable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq);
 
 #endif /* OMAP_MAILBOX_H */
-- 
2.0.0

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