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new helper: iov_iter_kvec()
[deliverable/linux.git] / drivers / mailbox / omap-mailbox.c
1 /*
2 * OMAP mailbox driver
3 *
4 * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
5 * Copyright (C) 2013-2014 Texas Instruments Inc.
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 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA
23 *
24 */
25
26 #include <linux/interrupt.h>
27 #include <linux/spinlock.h>
28 #include <linux/mutex.h>
29 #include <linux/slab.h>
30 #include <linux/kfifo.h>
31 #include <linux/err.h>
32 #include <linux/notifier.h>
33 #include <linux/module.h>
34 #include <linux/of_device.h>
35 #include <linux/platform_device.h>
36 #include <linux/pm_runtime.h>
37 #include <linux/platform_data/mailbox-omap.h>
38 #include <linux/omap-mailbox.h>
39
40 #define MAILBOX_REVISION 0x000
41 #define MAILBOX_MESSAGE(m) (0x040 + 4 * (m))
42 #define MAILBOX_FIFOSTATUS(m) (0x080 + 4 * (m))
43 #define MAILBOX_MSGSTATUS(m) (0x0c0 + 4 * (m))
44
45 #define OMAP2_MAILBOX_IRQSTATUS(u) (0x100 + 8 * (u))
46 #define OMAP2_MAILBOX_IRQENABLE(u) (0x104 + 8 * (u))
47
48 #define OMAP4_MAILBOX_IRQSTATUS(u) (0x104 + 0x10 * (u))
49 #define OMAP4_MAILBOX_IRQENABLE(u) (0x108 + 0x10 * (u))
50 #define OMAP4_MAILBOX_IRQENABLE_CLR(u) (0x10c + 0x10 * (u))
51
52 #define MAILBOX_IRQSTATUS(type, u) (type ? OMAP4_MAILBOX_IRQSTATUS(u) : \
53 OMAP2_MAILBOX_IRQSTATUS(u))
54 #define MAILBOX_IRQENABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE(u) : \
55 OMAP2_MAILBOX_IRQENABLE(u))
56 #define MAILBOX_IRQDISABLE(type, u) (type ? OMAP4_MAILBOX_IRQENABLE_CLR(u) \
57 : OMAP2_MAILBOX_IRQENABLE(u))
58
59 #define MAILBOX_IRQ_NEWMSG(m) (1 << (2 * (m)))
60 #define MAILBOX_IRQ_NOTFULL(m) (1 << (2 * (m) + 1))
61
62 #define MBOX_REG_SIZE 0x120
63
64 #define OMAP4_MBOX_REG_SIZE 0x130
65
66 #define MBOX_NR_REGS (MBOX_REG_SIZE / sizeof(u32))
67 #define OMAP4_MBOX_NR_REGS (OMAP4_MBOX_REG_SIZE / sizeof(u32))
68
69 struct omap_mbox_fifo {
70 unsigned long msg;
71 unsigned long fifo_stat;
72 unsigned long msg_stat;
73 unsigned long irqenable;
74 unsigned long irqstatus;
75 unsigned long irqdisable;
76 u32 intr_bit;
77 };
78
79 struct omap_mbox_queue {
80 spinlock_t lock;
81 struct kfifo fifo;
82 struct work_struct work;
83 struct tasklet_struct tasklet;
84 struct omap_mbox *mbox;
85 bool full;
86 };
87
88 struct omap_mbox_device {
89 struct device *dev;
90 struct mutex cfg_lock;
91 void __iomem *mbox_base;
92 u32 num_users;
93 u32 num_fifos;
94 struct omap_mbox **mboxes;
95 struct list_head elem;
96 };
97
98 struct omap_mbox_fifo_info {
99 int tx_id;
100 int tx_usr;
101 int tx_irq;
102
103 int rx_id;
104 int rx_usr;
105 int rx_irq;
106
107 const char *name;
108 };
109
110 struct omap_mbox {
111 const char *name;
112 int irq;
113 struct omap_mbox_queue *txq, *rxq;
114 struct device *dev;
115 struct omap_mbox_device *parent;
116 struct omap_mbox_fifo tx_fifo;
117 struct omap_mbox_fifo rx_fifo;
118 u32 ctx[OMAP4_MBOX_NR_REGS];
119 u32 intr_type;
120 int use_count;
121 struct blocking_notifier_head notifier;
122 };
123
124 /* global variables for the mailbox devices */
125 static DEFINE_MUTEX(omap_mbox_devices_lock);
126 static LIST_HEAD(omap_mbox_devices);
127
128 static unsigned int mbox_kfifo_size = CONFIG_OMAP_MBOX_KFIFO_SIZE;
129 module_param(mbox_kfifo_size, uint, S_IRUGO);
130 MODULE_PARM_DESC(mbox_kfifo_size, "Size of omap's mailbox kfifo (bytes)");
131
132 static inline
133 unsigned int mbox_read_reg(struct omap_mbox_device *mdev, size_t ofs)
134 {
135 return __raw_readl(mdev->mbox_base + ofs);
136 }
137
138 static inline
139 void mbox_write_reg(struct omap_mbox_device *mdev, u32 val, size_t ofs)
140 {
141 __raw_writel(val, mdev->mbox_base + ofs);
142 }
143
144 /* Mailbox FIFO handle functions */
145 static mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
146 {
147 struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
148 return (mbox_msg_t) mbox_read_reg(mbox->parent, fifo->msg);
149 }
150
151 static void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
152 {
153 struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
154 mbox_write_reg(mbox->parent, msg, fifo->msg);
155 }
156
157 static int mbox_fifo_empty(struct omap_mbox *mbox)
158 {
159 struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
160 return (mbox_read_reg(mbox->parent, fifo->msg_stat) == 0);
161 }
162
163 static int mbox_fifo_full(struct omap_mbox *mbox)
164 {
165 struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
166 return mbox_read_reg(mbox->parent, fifo->fifo_stat);
167 }
168
169 /* Mailbox IRQ handle functions */
170 static void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
171 {
172 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
173 &mbox->tx_fifo : &mbox->rx_fifo;
174 u32 bit = fifo->intr_bit;
175 u32 irqstatus = fifo->irqstatus;
176
177 mbox_write_reg(mbox->parent, bit, irqstatus);
178
179 /* Flush posted write for irq status to avoid spurious interrupts */
180 mbox_read_reg(mbox->parent, irqstatus);
181 }
182
183 static int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
184 {
185 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
186 &mbox->tx_fifo : &mbox->rx_fifo;
187 u32 bit = fifo->intr_bit;
188 u32 irqenable = fifo->irqenable;
189 u32 irqstatus = fifo->irqstatus;
190
191 u32 enable = mbox_read_reg(mbox->parent, irqenable);
192 u32 status = mbox_read_reg(mbox->parent, irqstatus);
193
194 return (int)(enable & status & bit);
195 }
196
197 /*
198 * message sender
199 */
200 int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
201 {
202 struct omap_mbox_queue *mq = mbox->txq;
203 int ret = 0, len;
204
205 spin_lock_bh(&mq->lock);
206
207 if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
208 ret = -ENOMEM;
209 goto out;
210 }
211
212 if (kfifo_is_empty(&mq->fifo) && !mbox_fifo_full(mbox)) {
213 mbox_fifo_write(mbox, msg);
214 goto out;
215 }
216
217 len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
218 WARN_ON(len != sizeof(msg));
219
220 tasklet_schedule(&mbox->txq->tasklet);
221
222 out:
223 spin_unlock_bh(&mq->lock);
224 return ret;
225 }
226 EXPORT_SYMBOL(omap_mbox_msg_send);
227
228 void omap_mbox_save_ctx(struct omap_mbox *mbox)
229 {
230 int i;
231 int nr_regs;
232
233 if (mbox->intr_type)
234 nr_regs = OMAP4_MBOX_NR_REGS;
235 else
236 nr_regs = MBOX_NR_REGS;
237 for (i = 0; i < nr_regs; i++) {
238 mbox->ctx[i] = mbox_read_reg(mbox->parent, i * sizeof(u32));
239
240 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
241 i, mbox->ctx[i]);
242 }
243 }
244 EXPORT_SYMBOL(omap_mbox_save_ctx);
245
246 void omap_mbox_restore_ctx(struct omap_mbox *mbox)
247 {
248 int i;
249 int nr_regs;
250
251 if (mbox->intr_type)
252 nr_regs = OMAP4_MBOX_NR_REGS;
253 else
254 nr_regs = MBOX_NR_REGS;
255 for (i = 0; i < nr_regs; i++) {
256 mbox_write_reg(mbox->parent, mbox->ctx[i], i * sizeof(u32));
257
258 dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,
259 i, mbox->ctx[i]);
260 }
261 }
262 EXPORT_SYMBOL(omap_mbox_restore_ctx);
263
264 void omap_mbox_enable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
265 {
266 u32 l;
267 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
268 &mbox->tx_fifo : &mbox->rx_fifo;
269 u32 bit = fifo->intr_bit;
270 u32 irqenable = fifo->irqenable;
271
272 l = mbox_read_reg(mbox->parent, irqenable);
273 l |= bit;
274 mbox_write_reg(mbox->parent, l, irqenable);
275 }
276 EXPORT_SYMBOL(omap_mbox_enable_irq);
277
278 void omap_mbox_disable_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
279 {
280 struct omap_mbox_fifo *fifo = (irq == IRQ_TX) ?
281 &mbox->tx_fifo : &mbox->rx_fifo;
282 u32 bit = fifo->intr_bit;
283 u32 irqdisable = fifo->irqdisable;
284
285 /*
286 * Read and update the interrupt configuration register for pre-OMAP4.
287 * OMAP4 and later SoCs have a dedicated interrupt disabling register.
288 */
289 if (!mbox->intr_type)
290 bit = mbox_read_reg(mbox->parent, irqdisable) & ~bit;
291
292 mbox_write_reg(mbox->parent, bit, irqdisable);
293 }
294 EXPORT_SYMBOL(omap_mbox_disable_irq);
295
296 static void mbox_tx_tasklet(unsigned long tx_data)
297 {
298 struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
299 struct omap_mbox_queue *mq = mbox->txq;
300 mbox_msg_t msg;
301 int ret;
302
303 while (kfifo_len(&mq->fifo)) {
304 if (mbox_fifo_full(mbox)) {
305 omap_mbox_enable_irq(mbox, IRQ_TX);
306 break;
307 }
308
309 ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
310 sizeof(msg));
311 WARN_ON(ret != sizeof(msg));
312
313 mbox_fifo_write(mbox, msg);
314 }
315 }
316
317 /*
318 * Message receiver(workqueue)
319 */
320 static void mbox_rx_work(struct work_struct *work)
321 {
322 struct omap_mbox_queue *mq =
323 container_of(work, struct omap_mbox_queue, work);
324 mbox_msg_t msg;
325 int len;
326
327 while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
328 len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
329 WARN_ON(len != sizeof(msg));
330
331 blocking_notifier_call_chain(&mq->mbox->notifier, len,
332 (void *)msg);
333 spin_lock_irq(&mq->lock);
334 if (mq->full) {
335 mq->full = false;
336 omap_mbox_enable_irq(mq->mbox, IRQ_RX);
337 }
338 spin_unlock_irq(&mq->lock);
339 }
340 }
341
342 /*
343 * Mailbox interrupt handler
344 */
345 static void __mbox_tx_interrupt(struct omap_mbox *mbox)
346 {
347 omap_mbox_disable_irq(mbox, IRQ_TX);
348 ack_mbox_irq(mbox, IRQ_TX);
349 tasklet_schedule(&mbox->txq->tasklet);
350 }
351
352 static void __mbox_rx_interrupt(struct omap_mbox *mbox)
353 {
354 struct omap_mbox_queue *mq = mbox->rxq;
355 mbox_msg_t msg;
356 int len;
357
358 while (!mbox_fifo_empty(mbox)) {
359 if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg))) {
360 omap_mbox_disable_irq(mbox, IRQ_RX);
361 mq->full = true;
362 goto nomem;
363 }
364
365 msg = mbox_fifo_read(mbox);
366
367 len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
368 WARN_ON(len != sizeof(msg));
369 }
370
371 /* no more messages in the fifo. clear IRQ source. */
372 ack_mbox_irq(mbox, IRQ_RX);
373 nomem:
374 schedule_work(&mbox->rxq->work);
375 }
376
377 static irqreturn_t mbox_interrupt(int irq, void *p)
378 {
379 struct omap_mbox *mbox = p;
380
381 if (is_mbox_irq(mbox, IRQ_TX))
382 __mbox_tx_interrupt(mbox);
383
384 if (is_mbox_irq(mbox, IRQ_RX))
385 __mbox_rx_interrupt(mbox);
386
387 return IRQ_HANDLED;
388 }
389
390 static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
391 void (*work) (struct work_struct *),
392 void (*tasklet)(unsigned long))
393 {
394 struct omap_mbox_queue *mq;
395
396 mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
397 if (!mq)
398 return NULL;
399
400 spin_lock_init(&mq->lock);
401
402 if (kfifo_alloc(&mq->fifo, mbox_kfifo_size, GFP_KERNEL))
403 goto error;
404
405 if (work)
406 INIT_WORK(&mq->work, work);
407
408 if (tasklet)
409 tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
410 return mq;
411 error:
412 kfree(mq);
413 return NULL;
414 }
415
416 static void mbox_queue_free(struct omap_mbox_queue *q)
417 {
418 kfifo_free(&q->fifo);
419 kfree(q);
420 }
421
422 static int omap_mbox_startup(struct omap_mbox *mbox)
423 {
424 int ret = 0;
425 struct omap_mbox_queue *mq;
426 struct omap_mbox_device *mdev = mbox->parent;
427
428 mutex_lock(&mdev->cfg_lock);
429 ret = pm_runtime_get_sync(mdev->dev);
430 if (unlikely(ret < 0))
431 goto fail_startup;
432
433 if (!mbox->use_count++) {
434 mq = mbox_queue_alloc(mbox, NULL, mbox_tx_tasklet);
435 if (!mq) {
436 ret = -ENOMEM;
437 goto fail_alloc_txq;
438 }
439 mbox->txq = mq;
440
441 mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
442 if (!mq) {
443 ret = -ENOMEM;
444 goto fail_alloc_rxq;
445 }
446 mbox->rxq = mq;
447 mq->mbox = mbox;
448 ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
449 mbox->name, mbox);
450 if (unlikely(ret)) {
451 pr_err("failed to register mailbox interrupt:%d\n",
452 ret);
453 goto fail_request_irq;
454 }
455
456 omap_mbox_enable_irq(mbox, IRQ_RX);
457 }
458 mutex_unlock(&mdev->cfg_lock);
459 return 0;
460
461 fail_request_irq:
462 mbox_queue_free(mbox->rxq);
463 fail_alloc_rxq:
464 mbox_queue_free(mbox->txq);
465 fail_alloc_txq:
466 pm_runtime_put_sync(mdev->dev);
467 mbox->use_count--;
468 fail_startup:
469 mutex_unlock(&mdev->cfg_lock);
470 return ret;
471 }
472
473 static void omap_mbox_fini(struct omap_mbox *mbox)
474 {
475 struct omap_mbox_device *mdev = mbox->parent;
476
477 mutex_lock(&mdev->cfg_lock);
478
479 if (!--mbox->use_count) {
480 omap_mbox_disable_irq(mbox, IRQ_RX);
481 free_irq(mbox->irq, mbox);
482 tasklet_kill(&mbox->txq->tasklet);
483 flush_work(&mbox->rxq->work);
484 mbox_queue_free(mbox->txq);
485 mbox_queue_free(mbox->rxq);
486 }
487
488 pm_runtime_put_sync(mdev->dev);
489
490 mutex_unlock(&mdev->cfg_lock);
491 }
492
493 static struct omap_mbox *omap_mbox_device_find(struct omap_mbox_device *mdev,
494 const char *mbox_name)
495 {
496 struct omap_mbox *_mbox, *mbox = NULL;
497 struct omap_mbox **mboxes = mdev->mboxes;
498 int i;
499
500 if (!mboxes)
501 return NULL;
502
503 for (i = 0; (_mbox = mboxes[i]); i++) {
504 if (!strcmp(_mbox->name, mbox_name)) {
505 mbox = _mbox;
506 break;
507 }
508 }
509 return mbox;
510 }
511
512 struct omap_mbox *omap_mbox_get(const char *name, struct notifier_block *nb)
513 {
514 struct omap_mbox *mbox = NULL;
515 struct omap_mbox_device *mdev;
516 int ret;
517
518 mutex_lock(&omap_mbox_devices_lock);
519 list_for_each_entry(mdev, &omap_mbox_devices, elem) {
520 mbox = omap_mbox_device_find(mdev, name);
521 if (mbox)
522 break;
523 }
524 mutex_unlock(&omap_mbox_devices_lock);
525
526 if (!mbox)
527 return ERR_PTR(-ENOENT);
528
529 if (nb)
530 blocking_notifier_chain_register(&mbox->notifier, nb);
531
532 ret = omap_mbox_startup(mbox);
533 if (ret) {
534 blocking_notifier_chain_unregister(&mbox->notifier, nb);
535 return ERR_PTR(-ENODEV);
536 }
537
538 return mbox;
539 }
540 EXPORT_SYMBOL(omap_mbox_get);
541
542 void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb)
543 {
544 blocking_notifier_chain_unregister(&mbox->notifier, nb);
545 omap_mbox_fini(mbox);
546 }
547 EXPORT_SYMBOL(omap_mbox_put);
548
549 static struct class omap_mbox_class = { .name = "mbox", };
550
551 static int omap_mbox_register(struct omap_mbox_device *mdev)
552 {
553 int ret;
554 int i;
555 struct omap_mbox **mboxes;
556
557 if (!mdev || !mdev->mboxes)
558 return -EINVAL;
559
560 mboxes = mdev->mboxes;
561 for (i = 0; mboxes[i]; i++) {
562 struct omap_mbox *mbox = mboxes[i];
563 mbox->dev = device_create(&omap_mbox_class,
564 mdev->dev, 0, mbox, "%s", mbox->name);
565 if (IS_ERR(mbox->dev)) {
566 ret = PTR_ERR(mbox->dev);
567 goto err_out;
568 }
569
570 BLOCKING_INIT_NOTIFIER_HEAD(&mbox->notifier);
571 }
572
573 mutex_lock(&omap_mbox_devices_lock);
574 list_add(&mdev->elem, &omap_mbox_devices);
575 mutex_unlock(&omap_mbox_devices_lock);
576
577 return 0;
578
579 err_out:
580 while (i--)
581 device_unregister(mboxes[i]->dev);
582 return ret;
583 }
584
585 static int omap_mbox_unregister(struct omap_mbox_device *mdev)
586 {
587 int i;
588 struct omap_mbox **mboxes;
589
590 if (!mdev || !mdev->mboxes)
591 return -EINVAL;
592
593 mutex_lock(&omap_mbox_devices_lock);
594 list_del(&mdev->elem);
595 mutex_unlock(&omap_mbox_devices_lock);
596
597 mboxes = mdev->mboxes;
598 for (i = 0; mboxes[i]; i++)
599 device_unregister(mboxes[i]->dev);
600 return 0;
601 }
602
603 static const struct of_device_id omap_mailbox_of_match[] = {
604 {
605 .compatible = "ti,omap2-mailbox",
606 .data = (void *)MBOX_INTR_CFG_TYPE1,
607 },
608 {
609 .compatible = "ti,omap3-mailbox",
610 .data = (void *)MBOX_INTR_CFG_TYPE1,
611 },
612 {
613 .compatible = "ti,omap4-mailbox",
614 .data = (void *)MBOX_INTR_CFG_TYPE2,
615 },
616 {
617 /* end */
618 },
619 };
620 MODULE_DEVICE_TABLE(of, omap_mailbox_of_match);
621
622 static int omap_mbox_probe(struct platform_device *pdev)
623 {
624 struct resource *mem;
625 int ret;
626 struct omap_mbox **list, *mbox, *mboxblk;
627 struct omap_mbox_pdata *pdata = pdev->dev.platform_data;
628 struct omap_mbox_dev_info *info = NULL;
629 struct omap_mbox_fifo_info *finfo, *finfoblk;
630 struct omap_mbox_device *mdev;
631 struct omap_mbox_fifo *fifo;
632 struct device_node *node = pdev->dev.of_node;
633 struct device_node *child;
634 const struct of_device_id *match;
635 u32 intr_type, info_count;
636 u32 num_users, num_fifos;
637 u32 tmp[3];
638 u32 l;
639 int i;
640
641 if (!node && (!pdata || !pdata->info_cnt || !pdata->info)) {
642 pr_err("%s: platform not supported\n", __func__);
643 return -ENODEV;
644 }
645
646 if (node) {
647 match = of_match_device(omap_mailbox_of_match, &pdev->dev);
648 if (!match)
649 return -ENODEV;
650 intr_type = (u32)match->data;
651
652 if (of_property_read_u32(node, "ti,mbox-num-users",
653 &num_users))
654 return -ENODEV;
655
656 if (of_property_read_u32(node, "ti,mbox-num-fifos",
657 &num_fifos))
658 return -ENODEV;
659
660 info_count = of_get_available_child_count(node);
661 if (!info_count) {
662 dev_err(&pdev->dev, "no available mbox devices found\n");
663 return -ENODEV;
664 }
665 } else { /* non-DT device creation */
666 info_count = pdata->info_cnt;
667 info = pdata->info;
668 intr_type = pdata->intr_type;
669 num_users = pdata->num_users;
670 num_fifos = pdata->num_fifos;
671 }
672
673 finfoblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*finfoblk),
674 GFP_KERNEL);
675 if (!finfoblk)
676 return -ENOMEM;
677
678 finfo = finfoblk;
679 child = NULL;
680 for (i = 0; i < info_count; i++, finfo++) {
681 if (node) {
682 child = of_get_next_available_child(node, child);
683 ret = of_property_read_u32_array(child, "ti,mbox-tx",
684 tmp, ARRAY_SIZE(tmp));
685 if (ret)
686 return ret;
687 finfo->tx_id = tmp[0];
688 finfo->tx_irq = tmp[1];
689 finfo->tx_usr = tmp[2];
690
691 ret = of_property_read_u32_array(child, "ti,mbox-rx",
692 tmp, ARRAY_SIZE(tmp));
693 if (ret)
694 return ret;
695 finfo->rx_id = tmp[0];
696 finfo->rx_irq = tmp[1];
697 finfo->rx_usr = tmp[2];
698
699 finfo->name = child->name;
700 } else {
701 finfo->tx_id = info->tx_id;
702 finfo->rx_id = info->rx_id;
703 finfo->tx_usr = info->usr_id;
704 finfo->tx_irq = info->irq_id;
705 finfo->rx_usr = info->usr_id;
706 finfo->rx_irq = info->irq_id;
707 finfo->name = info->name;
708 info++;
709 }
710 if (finfo->tx_id >= num_fifos || finfo->rx_id >= num_fifos ||
711 finfo->tx_usr >= num_users || finfo->rx_usr >= num_users)
712 return -EINVAL;
713 }
714
715 mdev = devm_kzalloc(&pdev->dev, sizeof(*mdev), GFP_KERNEL);
716 if (!mdev)
717 return -ENOMEM;
718
719 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
720 mdev->mbox_base = devm_ioremap_resource(&pdev->dev, mem);
721 if (IS_ERR(mdev->mbox_base))
722 return PTR_ERR(mdev->mbox_base);
723
724 /* allocate one extra for marking end of list */
725 list = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*list),
726 GFP_KERNEL);
727 if (!list)
728 return -ENOMEM;
729
730 mboxblk = devm_kzalloc(&pdev->dev, info_count * sizeof(*mbox),
731 GFP_KERNEL);
732 if (!mboxblk)
733 return -ENOMEM;
734
735 mbox = mboxblk;
736 finfo = finfoblk;
737 for (i = 0; i < info_count; i++, finfo++) {
738 fifo = &mbox->tx_fifo;
739 fifo->msg = MAILBOX_MESSAGE(finfo->tx_id);
740 fifo->fifo_stat = MAILBOX_FIFOSTATUS(finfo->tx_id);
741 fifo->intr_bit = MAILBOX_IRQ_NOTFULL(finfo->tx_id);
742 fifo->irqenable = MAILBOX_IRQENABLE(intr_type, finfo->tx_usr);
743 fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->tx_usr);
744 fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->tx_usr);
745
746 fifo = &mbox->rx_fifo;
747 fifo->msg = MAILBOX_MESSAGE(finfo->rx_id);
748 fifo->msg_stat = MAILBOX_MSGSTATUS(finfo->rx_id);
749 fifo->intr_bit = MAILBOX_IRQ_NEWMSG(finfo->rx_id);
750 fifo->irqenable = MAILBOX_IRQENABLE(intr_type, finfo->rx_usr);
751 fifo->irqstatus = MAILBOX_IRQSTATUS(intr_type, finfo->rx_usr);
752 fifo->irqdisable = MAILBOX_IRQDISABLE(intr_type, finfo->rx_usr);
753
754 mbox->intr_type = intr_type;
755
756 mbox->parent = mdev;
757 mbox->name = finfo->name;
758 mbox->irq = platform_get_irq(pdev, finfo->tx_irq);
759 if (mbox->irq < 0)
760 return mbox->irq;
761 list[i] = mbox++;
762 }
763
764 mutex_init(&mdev->cfg_lock);
765 mdev->dev = &pdev->dev;
766 mdev->num_users = num_users;
767 mdev->num_fifos = num_fifos;
768 mdev->mboxes = list;
769 ret = omap_mbox_register(mdev);
770 if (ret)
771 return ret;
772
773 platform_set_drvdata(pdev, mdev);
774 pm_runtime_enable(mdev->dev);
775
776 ret = pm_runtime_get_sync(mdev->dev);
777 if (ret < 0) {
778 pm_runtime_put_noidle(mdev->dev);
779 goto unregister;
780 }
781
782 /*
783 * just print the raw revision register, the format is not
784 * uniform across all SoCs
785 */
786 l = mbox_read_reg(mdev, MAILBOX_REVISION);
787 dev_info(mdev->dev, "omap mailbox rev 0x%x\n", l);
788
789 ret = pm_runtime_put_sync(mdev->dev);
790 if (ret < 0)
791 goto unregister;
792
793 devm_kfree(&pdev->dev, finfoblk);
794 return 0;
795
796 unregister:
797 pm_runtime_disable(mdev->dev);
798 omap_mbox_unregister(mdev);
799 return ret;
800 }
801
802 static int omap_mbox_remove(struct platform_device *pdev)
803 {
804 struct omap_mbox_device *mdev = platform_get_drvdata(pdev);
805
806 pm_runtime_disable(mdev->dev);
807 omap_mbox_unregister(mdev);
808
809 return 0;
810 }
811
812 static struct platform_driver omap_mbox_driver = {
813 .probe = omap_mbox_probe,
814 .remove = omap_mbox_remove,
815 .driver = {
816 .name = "omap-mailbox",
817 .owner = THIS_MODULE,
818 .of_match_table = of_match_ptr(omap_mailbox_of_match),
819 },
820 };
821
822 static int __init omap_mbox_init(void)
823 {
824 int err;
825
826 err = class_register(&omap_mbox_class);
827 if (err)
828 return err;
829
830 /* kfifo size sanity check: alignment and minimal size */
831 mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
832 mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size,
833 sizeof(mbox_msg_t));
834
835 return platform_driver_register(&omap_mbox_driver);
836 }
837 subsys_initcall(omap_mbox_init);
838
839 static void __exit omap_mbox_exit(void)
840 {
841 platform_driver_unregister(&omap_mbox_driver);
842 class_unregister(&omap_mbox_class);
843 }
844 module_exit(omap_mbox_exit);
845
846 MODULE_LICENSE("GPL v2");
847 MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
848 MODULE_AUTHOR("Toshihiro Kobayashi");
849 MODULE_AUTHOR("Hiroshi DOYU");
Linux kernel - Deliverables
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