4 * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
5 * Copyright (C) 2013-2016 Texas Instruments Incorporated - http://www.ti.com
7 * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
8 * Suman Anna <s-anna@ti.com>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
20 #include <linux/interrupt.h>
21 #include <linux/spinlock.h>
22 #include <linux/mutex.h>
23 #include <linux/slab.h>
24 #include <linux/kfifo.h>
25 #include <linux/err.h>
26 #include <linux/module.h>
27 #include <linux/of_device.h>
28 #include <linux/platform_device.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/omap-mailbox.h>
31 #include <linux/mailbox_controller.h>
32 #include <linux/mailbox_client.h>
36 #define MAILBOX_REVISION 0x000
37 #define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
38 #define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
39 #define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
41 #define OMAP2_MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
42 #define OMAP2_MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
44 #define OMAP4_MAILBOX_IRQSTATUS(u) (0x104 + 0x10 * (u))
45 #define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 0x10 * (u))
46 #define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 0x10 * (u))
48 #define MAILBOX_IRQSTATUS(type, u) (type ? OMAP4_MAILBOX_IRQSTATUS(u) : \
49 OMAP2_MAILBOX_IRQSTATUS(u))
50 #define MAILBOX_IRQENABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE(u) : \
51 OMAP2_MAILBOX_IRQENABLE(u))
52 #define MAILBOX_IRQDISABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE_CLR(u) \
53 : OMAP2_MAILBOX_IRQENABLE(u))
55 #define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
56 #define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))
58 /* Interrupt register configuration types */
59 #define MBOX_INTR_CFG_TYPE1 0
60 #define MBOX_INTR_CFG_TYPE2 1
62 struct omap_mbox_fifo {
64 unsigned long fifo_stat;
65 unsigned long msg_stat;
66 unsigned long irqenable;
67 unsigned long irqstatus;
68 unsigned long irqdisable;
72 struct omap_mbox_queue {
75 struct work_struct work;
76 struct omap_mbox *mbox;
80 struct omap_mbox_device {
82 struct mutex cfg_lock;
83 void __iomem *mbox_base;
88 struct omap_mbox **mboxes;
89 struct mbox_controller controller;
90 struct list_head elem;
93 struct omap_mbox_fifo_info {
109 struct omap_mbox_queue *rxq;
111 struct omap_mbox_device *parent;
112 struct omap_mbox_fifo tx_fifo;
113 struct omap_mbox_fifo rx_fifo;
115 struct mbox_chan *chan;
119 /* global variables for the mailbox devices */
120 static DEFINE_MUTEX(omap_mbox_devices_lock);
121 static LIST_HEAD(omap_mbox_devices);
123 static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
124 module_param(mbox_kfifo_size, uint, S_IRUGO);
125 MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");
127 static struct omap_mbox *mbox_chan_to_omap_mbox(struct mbox_chan *chan)
129 if (!chan || !chan->con_priv)
132 return (struct omap_mbox *)chan->con_priv;
136 unsigned int mbox_read_reg(struct omap_mbox_device *mdev, size_t ofs)
138 return __raw_readl(mdev->mbox_base + ofs);
142 void mbox_write_reg(struct omap_mbox_device *mdev, u32 val, size_t ofs)
144 __raw_writel(val, mdev->mbox_base + ofs);
147 /* Mailbox FIFO handle functions */
148 static mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
150 struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
152 return (mbox_msg_t)mbox_read_reg(mbox->parent, fifo->msg);
155 static void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
157 struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
159 mbox_write_reg(mbox->parent, msg, fifo->msg);
162 static int mbox_fifo_empty(struct omap_mbox *mbox)
164 struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
166 return (mbox_read_reg(mbox->parent, fifo->msg_stat) == 0);
169 static int mbox_fifo_full(struct omap_mbox *mbox)
171 struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
173 return mbox_read_reg(mbox->parent, fifo->fifo_stat);
176 /* Mailbox IRQ handle functions */
177 static void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
179 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
180 &mbox->tx_fifo : &mbox->rx_fifo;
181 u32 bit = fifo->intr_bit;
182 u32 irqstatus = fifo->irqstatus;
184 mbox_write_reg(mbox->parent, bit, irqstatus);
186 /* Flush posted write for irq status to avoid spurious interrupts */
187 mbox_read_reg(mbox->parent, irqstatus);
190 static int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
192 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
193 &mbox->tx_fifo : &mbox->rx_fifo;
194 u32 bit = fifo->intr_bit;
195 u32 irqenable = fifo->irqenable;
196 u32 irqstatus = fifo->irqstatus;
198 u32 enable = mbox_read_reg(mbox->parent, irqenable);
199 u32 status = mbox_read_reg(mbox->parent, irqstatus);
201 return (int)(enable & status & bit);
204 static void _omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
207 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
208 &mbox->tx_fifo : &mbox->rx_fifo;
209 u32 bit = fifo->intr_bit;
210 u32 irqenable = fifo->irqenable;
212 l = mbox_read_reg(mbox->parent, irqenable);
214 mbox_write_reg(mbox->parent, l, irqenable);
217 static void _omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
219 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
220 &mbox->tx_fifo : &mbox->rx_fifo;
221 u32 bit = fifo->intr_bit;
222 u32 irqdisable = fifo->irqdisable;
225 * Read and update the interrupt configuration register for pre-OMAP4.
226 * OMAP4 and later SoCs have a dedicated interrupt disabling register.
228 if (!mbox->intr_type)
229 bit = mbox_read_reg(mbox->parent, irqdisable) & ~bit;
231 mbox_write_reg(mbox->parent, bit, irqdisable);
234 void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
236 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
241 _omap_mbox_enable_irq(mbox, irq);
243 EXPORT_SYMBOL(omap_mbox_enable_irq);
245 void omap_mbox_disable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
247 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
252 _omap_mbox_disable_irq(mbox, irq);
254 EXPORT_SYMBOL(omap_mbox_disable_irq);
257 * Message receiver(workqueue)
259 static void mbox_rx_work(struct work_struct *work)
261 struct omap_mbox_queue *mq =
262 container_of(work, struct omap_mbox_queue, work);
266 while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
267 len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
268 WARN_ON(len != sizeof(msg));
270 mbox_chan_received_data(mq->mbox->chan, (void *)msg);
271 spin_lock_irq(&mq->lock);
274 _omap_mbox_enable_irq(mq->mbox, IRQ_RX);
276 spin_unlock_irq(&mq->lock);
281 * Mailbox interrupt handler
283 static void __mbox_tx_interrupt(struct omap_mbox *mbox)
285 _omap_mbox_disable_irq(mbox, IRQ_TX);
286 ack_mbox_irq(mbox, IRQ_TX);
287 mbox_chan_txdone(mbox->chan, 0);
290 static void __mbox_rx_interrupt(struct omap_mbox *mbox)
292 struct omap_mbox_queue *mq = mbox->rxq;
296 while (!mbox_fifo_empty(mbox)) {
297 if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
298 _omap_mbox_disable_irq(mbox, IRQ_RX);
303 msg = mbox_fifo_read(mbox);
305 len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
306 WARN_ON(len != sizeof(msg));
309 /* no more messages in the fifo. clear IRQ source. */
310 ack_mbox_irq(mbox, IRQ_RX);
312 schedule_work(&mbox->rxq->work);
315 static irqreturn_t mbox_interrupt(int irq, void *p)
317 struct omap_mbox *mbox = p;
319 if (is_mbox_irq(mbox, IRQ_TX))
320 __mbox_tx_interrupt(mbox);
322 if (is_mbox_irq(mbox, IRQ_RX))
323 __mbox_rx_interrupt(mbox);
328 static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
329 void (*work)(struct work_struct *))
331 struct omap_mbox_queue *mq;
336 mq = kzalloc(sizeof(*mq), GFP_KERNEL);
340 spin_lock_init(&mq->lock);
342 if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
345 INIT_WORK(&mq->work, work);
353 static void mbox_queue_free(struct omap_mbox_queue *q)
355 kfifo_free(&q->fifo);
359 static int omap_mbox_startup(struct omap_mbox *mbox)
362 struct omap_mbox_queue *mq;
364 mq = mbox_queue_alloc(mbox, mbox_rx_work);
370 ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
373 pr_err("failed to register mailbox interrupt:%d\n", ret);
374 goto fail_request_irq;
377 if (mbox->send_no_irq)
378 mbox->chan->txdone_method = TXDONE_BY_ACK;
380 _omap_mbox_enable_irq(mbox, IRQ_RX);
385 mbox_queue_free(mbox->rxq);
389 static void omap_mbox_fini(struct omap_mbox *mbox)
391 _omap_mbox_disable_irq(mbox, IRQ_RX);
392 free_irq(mbox->irq, mbox);
393 flush_work(&mbox->rxq->work);
394 mbox_queue_free(mbox->rxq);
397 static struct omap_mbox *omap_mbox_device_find(struct omap_mbox_device *mdev,
398 const char *mbox_name)
400 struct omap_mbox *_mbox, *mbox = NULL;
401 struct omap_mbox **mboxes = mdev->mboxes;
407 for (i = 0; (_mbox = mboxes[i]); i++) {
408 if (!strcmp(_mbox->name, mbox_name)) {
416 struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl,
417 const char *chan_name)
419 struct device *dev = cl->dev;
420 struct omap_mbox *mbox = NULL;
421 struct omap_mbox_device *mdev;
422 struct mbox_chan *chan;
427 return ERR_PTR(-ENODEV);
430 pr_err("%s: please use mbox_request_channel(), this API is supported only for OMAP non-DT usage\n",
432 return ERR_PTR(-ENODEV);
435 mutex_lock(&omap_mbox_devices_lock);
436 list_for_each_entry(mdev, &omap_mbox_devices, elem) {
437 mbox = omap_mbox_device_find(mdev, chan_name);
441 mutex_unlock(&omap_mbox_devices_lock);
443 if (!mbox || !mbox->chan)
444 return ERR_PTR(-ENOENT);
447 spin_lock_irqsave(&chan->lock, flags);
450 chan->active_req = NULL;
452 init_completion(&chan->tx_complete);
453 spin_unlock_irqrestore(&chan->lock, flags);
455 ret = chan->mbox->ops->startup(chan);
457 pr_err("Unable to startup the chan (%d)\n", ret);
458 mbox_free_channel(chan);
464 EXPORT_SYMBOL(omap_mbox_request_channel);
466 static struct class omap_mbox_class = { .name = "mbox", };
468 static int omap_mbox_register(struct omap_mbox_device *mdev)
472 struct omap_mbox **mboxes;
474 if (!mdev || !mdev->mboxes)
477 mboxes = mdev->mboxes;
478 for (i = 0; mboxes[i]; i++) {
479 struct omap_mbox *mbox = mboxes[i];
481 mbox->dev = device_create(&omap_mbox_class, mdev->dev,
482 0, mbox, "%s", mbox->name);
483 if (IS_ERR(mbox->dev)) {
484 ret = PTR_ERR(mbox->dev);
489 mutex_lock(&omap_mbox_devices_lock);
490 list_add(&mdev->elem, &omap_mbox_devices);
491 mutex_unlock(&omap_mbox_devices_lock);
493 ret = mbox_controller_register(&mdev->controller);
498 device_unregister(mboxes[i]->dev);
503 static int omap_mbox_unregister(struct omap_mbox_device *mdev)
506 struct omap_mbox **mboxes;
508 if (!mdev || !mdev->mboxes)
511 mutex_lock(&omap_mbox_devices_lock);
512 list_del(&mdev->elem);
513 mutex_unlock(&omap_mbox_devices_lock);
515 mbox_controller_unregister(&mdev->controller);
517 mboxes = mdev->mboxes;
518 for (i = 0; mboxes[i]; i++)
519 device_unregister(mboxes[i]->dev);
523 static int omap_mbox_chan_startup(struct mbox_chan *chan)
525 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
526 struct omap_mbox_device *mdev = mbox->parent;
529 mutex_lock(&mdev->cfg_lock);
530 pm_runtime_get_sync(mdev->dev);
531 ret = omap_mbox_startup(mbox);
533 pm_runtime_put_sync(mdev->dev);
534 mutex_unlock(&mdev->cfg_lock);
538 static void omap_mbox_chan_shutdown(struct mbox_chan *chan)
540 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
541 struct omap_mbox_device *mdev = mbox->parent;
543 mutex_lock(&mdev->cfg_lock);
544 omap_mbox_fini(mbox);
545 pm_runtime_put_sync(mdev->dev);
546 mutex_unlock(&mdev->cfg_lock);
549 static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, void *data)
553 if (!mbox_fifo_full(mbox)) {
554 _omap_mbox_enable_irq(mbox, IRQ_RX);
555 mbox_fifo_write(mbox, (mbox_msg_t)data);
557 _omap_mbox_disable_irq(mbox, IRQ_RX);
559 /* we must read and ack the interrupt directly from here */
560 mbox_fifo_read(mbox);
561 ack_mbox_irq(mbox, IRQ_RX);
567 static int omap_mbox_chan_send(struct omap_mbox *mbox, void *data)
571 if (!mbox_fifo_full(mbox)) {
572 mbox_fifo_write(mbox, (mbox_msg_t)data);
576 /* always enable the interrupt */
577 _omap_mbox_enable_irq(mbox, IRQ_TX);
581 static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
583 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
589 if (mbox->send_no_irq)
590 ret = omap_mbox_chan_send_noirq(mbox, data);
592 ret = omap_mbox_chan_send(mbox, data);
597 static const struct mbox_chan_ops omap_mbox_chan_ops = {
598 .startup = omap_mbox_chan_startup,
599 .send_data = omap_mbox_chan_send_data,
600 .shutdown = omap_mbox_chan_shutdown,
603 #ifdef CONFIG_PM_SLEEP
604 static int omap_mbox_suspend(struct device *dev)
606 struct omap_mbox_device *mdev = dev_get_drvdata(dev);
609 if (pm_runtime_status_suspended(dev))
612 for (fifo = 0; fifo < mdev->num_fifos; fifo++) {
613 if (mbox_read_reg(mdev, MAILBOX_MSGSTATUS(fifo))) {
614 dev_err(mdev->dev, "fifo %d has unexpected unread messages\n",
620 for (usr = 0; usr < mdev->num_users; usr++) {
621 reg = MAILBOX_IRQENABLE(mdev->intr_type, usr);
622 mdev->irq_ctx[usr] = mbox_read_reg(mdev, reg);
628 static int omap_mbox_resume(struct device *dev)
630 struct omap_mbox_device *mdev = dev_get_drvdata(dev);
633 if (pm_runtime_status_suspended(dev))
636 for (usr = 0; usr < mdev->num_users; usr++) {
637 reg = MAILBOX_IRQENABLE(mdev->intr_type, usr);
638 mbox_write_reg(mdev, mdev->irq_ctx[usr], reg);
645 static const struct dev_pm_ops omap_mbox_pm_ops = {
646 SET_SYSTEM_SLEEP_PM_OPS(omap_mbox_suspend, omap_mbox_resume)
649 static const struct of_device_id omap_mailbox_of_match[] = {
651 .compatible = "ti,omap2-mailbox",
652 .data = (void *)MBOX_INTR_CFG_TYPE1,
655 .compatible = "ti,omap3-mailbox",
656 .data = (void *)MBOX_INTR_CFG_TYPE1,
659 .compatible = "ti,omap4-mailbox",
660 .data = (void *)MBOX_INTR_CFG_TYPE2,
666 MODULE_DEVICE_TABLE(of, omap_mailbox_of_match);
668 static struct mbox_chan *omap_mbox_of_xlate(struct mbox_controller *controller,
669 const struct of_phandle_args *sp)
671 phandle phandle = sp->args[0];
672 struct device_node *node;
673 struct omap_mbox_device *mdev;
674 struct omap_mbox *mbox;
676 mdev = container_of(controller, struct omap_mbox_device, controller);
678 return ERR_PTR(-EINVAL);
680 node = of_find_node_by_phandle(phandle);
682 pr_err("%s: could not find node phandle 0x%x\n",
684 return ERR_PTR(-ENODEV);
687 mbox = omap_mbox_device_find(mdev, node->name);
689 return mbox ? mbox->chan : ERR_PTR(-ENOENT);
692 static int omap_mbox_probe(struct platform_device *pdev)
694 struct resource *mem;
696 struct mbox_chan *chnls;
697 struct omap_mbox **list, *mbox, *mboxblk;
698 struct omap_mbox_fifo_info *finfo, *finfoblk;
699 struct omap_mbox_device *mdev;
700 struct omap_mbox_fifo *fifo;
701 struct device_node *node = pdev->dev.of_node;
702 struct device_node *child;
703 const struct of_device_id *match;
704 u32 intr_type, info_count;
705 u32 num_users, num_fifos;
711 pr_err("%s: only DT-based devices are supported\n", __func__);
715 match = of_match_device(omap_mailbox_of_match, &pdev->dev);
718 intr_type = (u32)match->data;
720 if (of_property_read_u32(node, "ti,mbox-num-users", &num_users))
723 if (of_property_read_u32(node, "ti,mbox-num-fifos", &num_fifos))
726 info_count = of_get_available_child_count(node);
728 dev_err(&pdev->dev, "no available mbox devices found\n");
732 finfoblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*finfoblk),
739 for (i = 0; i < info_count; i++, finfo++) {
740 child = of_get_next_available_child(node, child);
741 ret = of_property_read_u32_array(child, "ti,mbox-tx", tmp,
745 finfo->tx_id = tmp[0];
746 finfo->tx_irq = tmp[1];
747 finfo->tx_usr = tmp[2];
749 ret = of_property_read_u32_array(child, "ti,mbox-rx", tmp,
753 finfo->rx_id = tmp[0];
754 finfo->rx_irq = tmp[1];
755 finfo->rx_usr = tmp[2];
757 finfo->name = child->name;
759 if (of_find_property(child, "ti,mbox-send-noirq", NULL))
760 finfo->send_no_irq = true;
762 if (finfo->tx_id >= num_fifos || finfo->rx_id >= num_fifos ||
763 finfo->tx_usr >= num_users || finfo->rx_usr >= num_users)
767 mdev = devm_kzalloc(&pdev->dev, sizeof(*mdev), GFP_KERNEL);
771 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
772 mdev->mbox_base = devm_ioremap_resource(&pdev->dev, mem);
773 if (IS_ERR(mdev->mbox_base))
774 return PTR_ERR(mdev->mbox_base);
776 mdev->irq_ctx = devm_kzalloc(&pdev->dev, num_users * sizeof(u32),
781 /* allocate one extra for marking end of list */
782 list = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*list),
787 chnls = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*chnls),
792 mboxblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*mbox),
799 for (i = 0; i < info_count; i++, finfo++) {
800 fifo = &mbox->tx_fifo;
801 fifo->msg = MAILBOX_MESSAGE(finfo->tx_id);
802 fifo->fifo_stat = MAILBOX_FIFOSTATUS(finfo->tx_id);
803 fifo->intr_bit = MAILBOX_IRQ_NOTFULL(finfo->tx_id);
804 fifo->irqenable = MAILBOX_IRQENABLE(intr_type, finfo->tx_usr);
805 fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->tx_usr);
806 fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->tx_usr);
808 fifo = &mbox->rx_fifo;
809 fifo->msg = MAILBOX_MESSAGE(finfo->rx_id);
810 fifo->msg_stat = MAILBOX_MSGSTATUS(finfo->rx_id);
811 fifo->intr_bit = MAILBOX_IRQ_NEWMSG(finfo->rx_id);
812 fifo->irqenable = MAILBOX_IRQENABLE(intr_type, finfo->rx_usr);
813 fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->rx_usr);
814 fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->rx_usr);
816 mbox->send_no_irq = finfo->send_no_irq;
817 mbox->intr_type = intr_type;
820 mbox->name = finfo->name;
821 mbox->irq = platform_get_irq(pdev, finfo->tx_irq);
824 mbox->chan = &chnls[i];
825 chnls[i].con_priv = mbox;
829 mutex_init(&mdev->cfg_lock);
830 mdev->dev = &pdev->dev;
831 mdev->num_users = num_users;
832 mdev->num_fifos = num_fifos;
833 mdev->intr_type = intr_type;
836 /* OMAP does not have a Tx-Done IRQ, but rather a Tx-Ready IRQ */
837 mdev->controller.txdone_irq = true;
838 mdev->controller.dev = mdev->dev;
839 mdev->controller.ops = &omap_mbox_chan_ops;
840 mdev->controller.chans = chnls;
841 mdev->controller.num_chans = info_count;
842 mdev->controller.of_xlate = omap_mbox_of_xlate;
843 ret = omap_mbox_register(mdev);
847 platform_set_drvdata(pdev, mdev);
848 pm_runtime_enable(mdev->dev);
850 ret = pm_runtime_get_sync(mdev->dev);
852 pm_runtime_put_noidle(mdev->dev);
857 * just print the raw revision register, the format is not
858 * uniform across all SoCs
860 l = mbox_read_reg(mdev, MAILBOX_REVISION);
861 dev_info(mdev->dev, "omap mailbox rev 0x%x\n", l);
863 ret = pm_runtime_put_sync(mdev->dev);
867 devm_kfree(&pdev->dev, finfoblk);
871 pm_runtime_disable(mdev->dev);
872 omap_mbox_unregister(mdev);
876 static int omap_mbox_remove(struct platform_device *pdev)
878 struct omap_mbox_device *mdev = platform_get_drvdata(pdev);
880 pm_runtime_disable(mdev->dev);
881 omap_mbox_unregister(mdev);
886 static struct platform_driver omap_mbox_driver = {
887 .probe = omap_mbox_probe,
888 .remove = omap_mbox_remove,
890 .name = "omap-mailbox",
891 .pm = &omap_mbox_pm_ops,
892 .of_match_table = of_match_ptr(omap_mailbox_of_match),
896 static int __init omap_mbox_init(void)
900 err = class_register(&omap_mbox_class);
904 /* kfifo size sanity check: alignment and minimal size */
905 mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
906 mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size,
909 return platform_driver_register(&omap_mbox_driver);
911 subsys_initcall(omap_mbox_init);
913 static void __exit omap_mbox_exit(void)
915 platform_driver_unregister(&omap_mbox_driver);
916 class_unregister(&omap_mbox_class);
918 module_exit(omap_mbox_exit);
920 MODULE_LICENSE("GPL v2");
921 MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
922 MODULE_AUTHOR("Toshihiro Kobayashi");
923 MODULE_AUTHOR("Hiroshi DOYU");