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fscache: Fix hanging wait on page discarded by writeback
[linux/fpc-iii.git] / drivers / mailbox / omap-mailbox.c
blob2517038a8452c638aa45a11577cd20ee0dde6a20
1 /*
2 * OMAP mailbox driver
3 *
4 * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
5 * Copyright (C) 2013-2016 Texas Instruments Incorporated - http://www.ti.com
6 *
7 * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
8 * Suman Anna <s-anna@ti.com>
9 *
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.
13 *
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.
18 */
19
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>
33
34 #include "mailbox.h"
35
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))
40
41 #define OMAP2_MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
42 #define OMAP2_MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
43
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))
47
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))
54
55 #define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
56 #define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))
57
58 /* Interrupt register configuration types */
59 #define MBOX_INTR_CFG_TYPE1 0
60 #define MBOX_INTR_CFG_TYPE2 1
61
62 struct omap_mbox_fifo {
63 unsigned long msg;
64 unsigned long fifo_stat;
65 unsigned long msg_stat;
66 unsigned long irqenable;
67 unsigned long irqstatus;
68 unsigned long irqdisable;
69 u32 intr_bit;
70 };
71
72 struct omap_mbox_queue {
73 spinlock_t lock;
74 struct kfifo fifo;
75 struct work_struct work;
76 struct omap_mbox *mbox;
77 bool full;
78 };
79
80 struct omap_mbox_device {
81 struct device *dev;
82 struct mutex cfg_lock;
83 void __iomem *mbox_base;
84 u32 *irq_ctx;
85 u32 num_users;
86 u32 num_fifos;
87 u32 intr_type;
88 struct omap_mbox **mboxes;
89 struct mbox_controller controller;
90 struct list_head elem;
91 };
92
93 struct omap_mbox_fifo_info {
94 int tx_id;
95 int tx_usr;
96 int tx_irq;
97
98 int rx_id;
99 int rx_usr;
100 int rx_irq;
101
102 const char *name;
103 bool send_no_irq;
104 };
105
106 struct omap_mbox {
107 const char *name;
108 int irq;
109 struct omap_mbox_queue *rxq;
110 struct device *dev;
111 struct omap_mbox_device *parent;
112 struct omap_mbox_fifo tx_fifo;
113 struct omap_mbox_fifo rx_fifo;
114 u32 intr_type;
115 struct mbox_chan *chan;
116 bool send_no_irq;
117 };
118
119 /* global variables for the mailbox devices */
120 static DEFINE_MUTEX(omap_mbox_devices_lock);
121 static LIST_HEAD(omap_mbox_devices);
122
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)");
126
127 static struct omap_mbox *mbox_chan_to_omap_mbox(struct mbox_chan *chan)
128 {
129 if (!chan || !chan->con_priv)
130 return NULL;
131
132 return (struct omap_mbox *)chan->con_priv;
133 }
134
135 static inline
136 unsigned int mbox_read_reg(struct omap_mbox_device *mdev, size_t ofs)
137 {
138 return __raw_readl(mdev->mbox_base + ofs);
139 }
140
141 static inline
142 void mbox_write_reg(struct omap_mbox_device *mdev, u32 val, size_t ofs)
143 {
144 __raw_writel(val, mdev->mbox_base + ofs);
145 }
146
147 /* Mailbox FIFO handle functions */
148 static mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
149 {
150 struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
151
152 return (mbox_msg_t)mbox_read_reg(mbox->parent, fifo->msg);
153 }
154
155 static void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
156 {
157 struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
158
159 mbox_write_reg(mbox->parent, msg, fifo->msg);
160 }
161
162 static int mbox_fifo_empty(struct omap_mbox *mbox)
163 {
164 struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
165
166 return (mbox_read_reg(mbox->parent, fifo->msg_stat) == 0);
167 }
168
169 static int mbox_fifo_full(struct omap_mbox *mbox)
170 {
171 struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
172
173 return mbox_read_reg(mbox->parent, fifo->fifo_stat);
174 }
175
176 /* Mailbox IRQ handle functions */
177 static void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
178 {
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;
183
184 mbox_write_reg(mbox->parent, bit, irqstatus);
185
186 /* Flush posted write for irq status to avoid spurious interrupts */
187 mbox_read_reg(mbox->parent, irqstatus);
188 }
189
190 static int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
191 {
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;
197
198 u32 enable = mbox_read_reg(mbox->parent, irqenable);
199 u32 status = mbox_read_reg(mbox->parent, irqstatus);
200
201 return (int)(enable & status & bit);
202 }
203
204 static void _omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
205 {
206 u32 l;
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;
211
212 l = mbox_read_reg(mbox->parent, irqenable);
213 l |= bit;
214 mbox_write_reg(mbox->parent, l, irqenable);
215 }
216
217 static void _omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
218 {
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;
223
224 /*
225 * Read and update the interrupt configuration register for pre-OMAP4.
226 * OMAP4 and later SoCs have a dedicated interrupt disabling register.
227 */
228 if (!mbox->intr_type)
229 bit = mbox_read_reg(mbox->parent, irqdisable) & ~bit;
230
231 mbox_write_reg(mbox->parent, bit, irqdisable);
232 }
233
234 void omap_mbox_enable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
235 {
236 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
237
238 if (WARN_ON(!mbox))
239 return;
240
241 _omap_mbox_enable_irq(mbox, irq);
242 }
243 EXPORT_SYMBOL(omap_mbox_enable_irq);
244
245 void omap_mbox_disable_irq(struct mbox_chan *chan, omap_mbox_irq_t irq)
246 {
247 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
248
249 if (WARN_ON(!mbox))
250 return;
251
252 _omap_mbox_disable_irq(mbox, irq);
253 }
254 EXPORT_SYMBOL(omap_mbox_disable_irq);
255
256 /*
257 * Message receiver(workqueue)
258 */
259 static void mbox_rx_work(struct work_struct *work)
260 {
261 struct omap_mbox_queue *mq =
262 container_of(work, struct omap_mbox_queue, work);
263 mbox_msg_t msg;
264 int len;
265
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));
269
270 mbox_chan_received_data(mq->mbox->chan, (void *)msg);
271 spin_lock_irq(&mq->lock);
272 if (mq->full) {
273 mq->full = false;
274 _omap_mbox_enable_irq(mq->mbox, IRQ_RX);
275 }
276 spin_unlock_irq(&mq->lock);
277 }
278 }
279
280 /*
281 * Mailbox interrupt handler
282 */
283 static void __mbox_tx_interrupt(struct omap_mbox *mbox)
284 {
285 _omap_mbox_disable_irq(mbox, IRQ_TX);
286 ack_mbox_irq(mbox, IRQ_TX);
287 mbox_chan_txdone(mbox->chan, 0);
288 }
289
290 static void __mbox_rx_interrupt(struct omap_mbox *mbox)
291 {
292 struct omap_mbox_queue *mq = mbox->rxq;
293 mbox_msg_t msg;
294 int len;
295
296 while (!mbox_fifo_empty(mbox)) {
297 if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
298 _omap_mbox_disable_irq(mbox, IRQ_RX);
299 mq->full = true;
300 goto nomem;
301 }
302
303 msg = mbox_fifo_read(mbox);
304
305 len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
306 WARN_ON(len != sizeof(msg));
307 }
308
309 /* no more messages in the fifo. clear IRQ source. */
310 ack_mbox_irq(mbox, IRQ_RX);
311 nomem:
312 schedule_work(&mbox->rxq->work);
313 }
314
315 static irqreturn_t mbox_interrupt(int irq, void *p)
316 {
317 struct omap_mbox *mbox = p;
318
319 if (is_mbox_irq(mbox, IRQ_TX))
320 __mbox_tx_interrupt(mbox);
321
322 if (is_mbox_irq(mbox, IRQ_RX))
323 __mbox_rx_interrupt(mbox);
324
325 return IRQ_HANDLED;
326 }
327
328 static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
329 void (*work)(struct work_struct *))
330 {
331 struct omap_mbox_queue *mq;
332
333 if (!work)
334 return NULL;
335
336 mq = kzalloc(sizeof(*mq), GFP_KERNEL);
337 if (!mq)
338 return NULL;
339
340 spin_lock_init(&mq->lock);
341
342 if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
343 goto error;
344
345 INIT_WORK(&mq->work, work);
346 return mq;
347
348 error:
349 kfree(mq);
350 return NULL;
351 }
352
353 static void mbox_queue_free(struct omap_mbox_queue *q)
354 {
355 kfifo_free(&q->fifo);
356 kfree(q);
357 }
358
359 static int omap_mbox_startup(struct omap_mbox *mbox)
360 {
361 int ret = 0;
362 struct omap_mbox_queue *mq;
363
364 mq = mbox_queue_alloc(mbox, mbox_rx_work);
365 if (!mq)
366 return -ENOMEM;
367 mbox->rxq = mq;
368 mq->mbox = mbox;
369
370 ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
371 mbox->name, mbox);
372 if (unlikely(ret)) {
373 pr_err("failed to register mailbox interrupt:%d\n", ret);
374 goto fail_request_irq;
375 }
376
377 if (mbox->send_no_irq)
378 mbox->chan->txdone_method = TXDONE_BY_ACK;
379
380 _omap_mbox_enable_irq(mbox, IRQ_RX);
381
382 return 0;
383
384 fail_request_irq:
385 mbox_queue_free(mbox->rxq);
386 return ret;
387 }
388
389 static void omap_mbox_fini(struct omap_mbox *mbox)
390 {
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);
395 }
396
397 static struct omap_mbox *omap_mbox_device_find(struct omap_mbox_device *mdev,
398 const char *mbox_name)
399 {
400 struct omap_mbox *_mbox, *mbox = NULL;
401 struct omap_mbox **mboxes = mdev->mboxes;
402 int i;
403
404 if (!mboxes)
405 return NULL;
406
407 for (i = 0; (_mbox = mboxes[i]); i++) {
408 if (!strcmp(_mbox->name, mbox_name)) {
409 mbox = _mbox;
410 break;
411 }
412 }
413 return mbox;
414 }
415
416 struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl,
417 const char *chan_name)
418 {
419 struct device *dev = cl->dev;
420 struct omap_mbox *mbox = NULL;
421 struct omap_mbox_device *mdev;
422 struct mbox_chan *chan;
423 unsigned long flags;
424 int ret;
425
426 if (!dev)
427 return ERR_PTR(-ENODEV);
428
429 if (dev->of_node) {
430 pr_err("%s: please use mbox_request_channel(), this API is supported only for OMAP non-DT usage\n",
431 __func__);
432 return ERR_PTR(-ENODEV);
433 }
434
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);
438 if (mbox)
439 break;
440 }
441 mutex_unlock(&omap_mbox_devices_lock);
442
443 if (!mbox || !mbox->chan)
444 return ERR_PTR(-ENOENT);
445
446 chan = mbox->chan;
447 spin_lock_irqsave(&chan->lock, flags);
448 chan->msg_free = 0;
449 chan->msg_count = 0;
450 chan->active_req = NULL;
451 chan->cl = cl;
452 init_completion(&chan->tx_complete);
453 spin_unlock_irqrestore(&chan->lock, flags);
454
455 ret = chan->mbox->ops->startup(chan);
456 if (ret) {
457 pr_err("Unable to startup the chan (%d)\n", ret);
458 mbox_free_channel(chan);
459 chan = ERR_PTR(ret);
460 }
461
462 return chan;
463 }
464 EXPORT_SYMBOL(omap_mbox_request_channel);
465
466 static struct class omap_mbox_class = { .name = "mbox", };
467
468 static int omap_mbox_register(struct omap_mbox_device *mdev)
469 {
470 int ret;
471 int i;
472 struct omap_mbox **mboxes;
473
474 if (!mdev || !mdev->mboxes)
475 return -EINVAL;
476
477 mboxes = mdev->mboxes;
478 for (i = 0; mboxes[i]; i++) {
479 struct omap_mbox *mbox = mboxes[i];
480
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);
485 goto err_out;
486 }
487 }
488
489 mutex_lock(&omap_mbox_devices_lock);
490 list_add(&mdev->elem, &omap_mbox_devices);
491 mutex_unlock(&omap_mbox_devices_lock);
492
493 ret = mbox_controller_register(&mdev->controller);
494
495 err_out:
496 if (ret) {
497 while (i--)
498 device_unregister(mboxes[i]->dev);
499 }
500 return ret;
501 }
502
503 static int omap_mbox_unregister(struct omap_mbox_device *mdev)
504 {
505 int i;
506 struct omap_mbox **mboxes;
507
508 if (!mdev || !mdev->mboxes)
509 return -EINVAL;
510
511 mutex_lock(&omap_mbox_devices_lock);
512 list_del(&mdev->elem);
513 mutex_unlock(&omap_mbox_devices_lock);
514
515 mbox_controller_unregister(&mdev->controller);
516
517 mboxes = mdev->mboxes;
518 for (i = 0; mboxes[i]; i++)
519 device_unregister(mboxes[i]->dev);
520 return 0;
521 }
522
523 static int omap_mbox_chan_startup(struct mbox_chan *chan)
524 {
525 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
526 struct omap_mbox_device *mdev = mbox->parent;
527 int ret = 0;
528
529 mutex_lock(&mdev->cfg_lock);
530 pm_runtime_get_sync(mdev->dev);
531 ret = omap_mbox_startup(mbox);
532 if (ret)
533 pm_runtime_put_sync(mdev->dev);
534 mutex_unlock(&mdev->cfg_lock);
535 return ret;
536 }
537
538 static void omap_mbox_chan_shutdown(struct mbox_chan *chan)
539 {
540 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
541 struct omap_mbox_device *mdev = mbox->parent;
542
543 mutex_lock(&mdev->cfg_lock);
544 omap_mbox_fini(mbox);
545 pm_runtime_put_sync(mdev->dev);
546 mutex_unlock(&mdev->cfg_lock);
547 }
548
549 static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, void *data)
550 {
551 int ret = -EBUSY;
552
553 if (!mbox_fifo_full(mbox)) {
554 _omap_mbox_enable_irq(mbox, IRQ_RX);
555 mbox_fifo_write(mbox, (mbox_msg_t)data);
556 ret = 0;
557 _omap_mbox_disable_irq(mbox, IRQ_RX);
558
559 /* we must read and ack the interrupt directly from here */
560 mbox_fifo_read(mbox);
561 ack_mbox_irq(mbox, IRQ_RX);
562 }
563
564 return ret;
565 }
566
567 static int omap_mbox_chan_send(struct omap_mbox *mbox, void *data)
568 {
569 int ret = -EBUSY;
570
571 if (!mbox_fifo_full(mbox)) {
572 mbox_fifo_write(mbox, (mbox_msg_t)data);
573 ret = 0;
574 }
575
576 /* always enable the interrupt */
577 _omap_mbox_enable_irq(mbox, IRQ_TX);
578 return ret;
579 }
580
581 static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
582 {
583 struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
584 int ret;
585
586 if (!mbox)
587 return -EINVAL;
588
589 if (mbox->send_no_irq)
590 ret = omap_mbox_chan_send_noirq(mbox, data);
591 else
592 ret = omap_mbox_chan_send(mbox, data);
593
594 return ret;
595 }
596
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,
601 };
602
603 #ifdef CONFIG_PM_SLEEP
604 static int omap_mbox_suspend(struct device *dev)
605 {
606 struct omap_mbox_device *mdev = dev_get_drvdata(dev);
607 u32 usr, fifo, reg;
608
609 if (pm_runtime_status_suspended(dev))
610 return 0;
611
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",
615 fifo);
616 return -EBUSY;
617 }
618 }
619
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);
623 }
624
625 return 0;
626 }
627
628 static int omap_mbox_resume(struct device *dev)
629 {
630 struct omap_mbox_device *mdev = dev_get_drvdata(dev);
631 u32 usr, reg;
632
633 if (pm_runtime_status_suspended(dev))
634 return 0;
635
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);
639 }
640
641 return 0;
642 }
643 #endif
644
645 static const struct dev_pm_ops omap_mbox_pm_ops = {
646 SET_SYSTEM_SLEEP_PM_OPS(omap_mbox_suspend, omap_mbox_resume)
647 };
648
649 static const struct of_device_id omap_mailbox_of_match[] = {
650 {
651 .compatible = "ti,omap2-mailbox",
652 .data = (void *)MBOX_INTR_CFG_TYPE1,
653 },
654 {
655 .compatible = "ti,omap3-mailbox",
656 .data = (void *)MBOX_INTR_CFG_TYPE1,
657 },
658 {
659 .compatible = "ti,omap4-mailbox",
660 .data = (void *)MBOX_INTR_CFG_TYPE2,
661 },
662 {
663 /* end */
664 },
665 };
666 MODULE_DEVICE_TABLE(of, omap_mailbox_of_match);
667
668 static struct mbox_chan *omap_mbox_of_xlate(struct mbox_controller *controller,
669 const struct of_phandle_args *sp)
670 {
671 phandle phandle = sp->args[0];
672 struct device_node *node;
673 struct omap_mbox_device *mdev;
674 struct omap_mbox *mbox;
675
676 mdev = container_of(controller, struct omap_mbox_device, controller);
677 if (WARN_ON(!mdev))
678 return ERR_PTR(-EINVAL);
679
680 node = of_find_node_by_phandle(phandle);
681 if (!node) {
682 pr_err("%s: could not find node phandle 0x%x\n",
683 __func__, phandle);
684 return ERR_PTR(-ENODEV);
685 }
686
687 mbox = omap_mbox_device_find(mdev, node->name);
688 of_node_put(node);
689 return mbox ? mbox->chan : ERR_PTR(-ENOENT);
690 }
691
692 static int omap_mbox_probe(struct platform_device *pdev)
693 {
694 struct resource *mem;
695 int ret;
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;
706 u32 tmp[3];
707 u32 l;
708 int i;
709
710 if (!node) {
711 pr_err("%s: only DT-based devices are supported\n", __func__);
712 return -ENODEV;
713 }
714
715 match = of_match_device(omap_mailbox_of_match, &pdev->dev);
716 if (!match)
717 return -ENODEV;
718 intr_type = (u32)match->data;
719
720 if (of_property_read_u32(node, "ti,mbox-num-users", &num_users))
721 return -ENODEV;
722
723 if (of_property_read_u32(node, "ti,mbox-num-fifos", &num_fifos))
724 return -ENODEV;
725
726 info_count = of_get_available_child_count(node);
727 if (!info_count) {
728 dev_err(&pdev->dev, "no available mbox devices found\n");
729 return -ENODEV;
730 }
731
732 finfoblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*finfoblk),
733 GFP_KERNEL);
734 if (!finfoblk)
735 return -ENOMEM;
736
737 finfo = finfoblk;
738 child = NULL;
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,
742 ARRAY_SIZE(tmp));
743 if (ret)
744 return ret;
745 finfo->tx_id = tmp[0];
746 finfo->tx_irq = tmp[1];
747 finfo->tx_usr = tmp[2];
748
749 ret = of_property_read_u32_array(child, "ti,mbox-rx", tmp,
750 ARRAY_SIZE(tmp));
751 if (ret)
752 return ret;
753 finfo->rx_id = tmp[0];
754 finfo->rx_irq = tmp[1];
755 finfo->rx_usr = tmp[2];
756
757 finfo->name = child->name;
758
759 if (of_find_property(child, "ti,mbox-send-noirq", NULL))
760 finfo->send_no_irq = true;
761
762 if (finfo->tx_id >= num_fifos || finfo->rx_id >= num_fifos ||
763 finfo->tx_usr >= num_users || finfo->rx_usr >= num_users)
764 return -EINVAL;
765 }
766
767 mdev = devm_kzalloc(&pdev->dev, sizeof(*mdev), GFP_KERNEL);
768 if (!mdev)
769 return -ENOMEM;
770
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);
775
776 mdev->irq_ctx = devm_kzalloc(&pdev->dev, num_users * sizeof(u32),
777 GFP_KERNEL);
778 if (!mdev->irq_ctx)
779 return -ENOMEM;
780
781 /* allocate one extra for marking end of list */
782 list = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*list),
783 GFP_KERNEL);
784 if (!list)
785 return -ENOMEM;
786
787 chnls = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*chnls),
788 GFP_KERNEL);
789 if (!chnls)
790 return -ENOMEM;
791
792 mboxblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*mbox),
793 GFP_KERNEL);
794 if (!mboxblk)
795 return -ENOMEM;
796
797 mbox = mboxblk;
798 finfo = finfoblk;
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);
807
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);
815
816 mbox->send_no_irq = finfo->send_no_irq;
817 mbox->intr_type = intr_type;
818
819 mbox->parent = mdev;
820 mbox->name = finfo->name;
821 mbox->irq = platform_get_irq(pdev, finfo->tx_irq);
822 if (mbox->irq < 0)
823 return mbox->irq;
824 mbox->chan = &chnls[i];
825 chnls[i].con_priv = mbox;
826 list[i] = mbox++;
827 }
828
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;
834 mdev->mboxes = list;
835
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);
844 if (ret)
845 return ret;
846
847 platform_set_drvdata(pdev, mdev);
848 pm_runtime_enable(mdev->dev);
849
850 ret = pm_runtime_get_sync(mdev->dev);
851 if (ret < 0) {
852 pm_runtime_put_noidle(mdev->dev);
853 goto unregister;
854 }
855
856 /*
857 * just print the raw revision register, the format is not
858 * uniform across all SoCs
859 */
860 l = mbox_read_reg(mdev, MAILBOX_REVISION);
861 dev_info(mdev->dev, "omap mailbox rev 0x%x\n", l);
862
863 ret = pm_runtime_put_sync(mdev->dev);
864 if (ret < 0)
865 goto unregister;
866
867 devm_kfree(&pdev->dev, finfoblk);
868 return 0;
869
870 unregister:
871 pm_runtime_disable(mdev->dev);
872 omap_mbox_unregister(mdev);
873 return ret;
874 }
875
876 static int omap_mbox_remove(struct platform_device *pdev)
877 {
878 struct omap_mbox_device *mdev = platform_get_drvdata(pdev);
879
880 pm_runtime_disable(mdev->dev);
881 omap_mbox_unregister(mdev);
882
883 return 0;
884 }
885
886 static struct platform_driver omap_mbox_driver = {
887 .probe = omap_mbox_probe,
888 .remove = omap_mbox_remove,
889 .driver = {
890 .name = "omap-mailbox",
891 .pm = &omap_mbox_pm_ops,
892 .of_match_table = of_match_ptr(omap_mailbox_of_match),
893 },
894 };
895
896 static int __init omap_mbox_init(void)
897 {
898 int err;
899
900 err = class_register(&omap_mbox_class);
901 if (err)
902 return err;
903
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,
907 sizeof(mbox_msg_t));
908
909 err = platform_driver_register(&omap_mbox_driver);
910 if (err)
911 class_unregister(&omap_mbox_class);
912
913 return err;
914 }
915 subsys_initcall(omap_mbox_init);
916
917 static void __exit omap_mbox_exit(void)
918 {
919 platform_driver_unregister(&omap_mbox_driver);
920 class_unregister(&omap_mbox_class);
921 }
922 module_exit(omap_mbox_exit);
923
924 MODULE_LICENSE("GPL v2");
925 MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
926 MODULE_AUTHOR("Toshihiro Kobayashi");
927 MODULE_AUTHOR("Hiroshi DOYU");
Linux with added FPC-III support