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340a614a HD |
1 | /* |
2 | * OMAP mailbox driver | |
3 | * | |
4 | * Copyright (C) 2006 Nokia Corporation. All rights reserved. | |
5 | * | |
6 | * Contact: Toshihiro Kobayashi <toshihiro.kobayashi@nokia.com> | |
7 | * Restructured by Hiroshi DOYU <Hiroshi.DOYU@nokia.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/init.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/blkdev.h> | |
31 | #include <linux/err.h> | |
32 | #include <linux/delay.h> | |
33 | #include <asm/io.h> | |
34 | #include <asm/arch/mailbox.h> | |
35 | #include "mailbox.h" | |
36 | ||
37 | static struct omap_mbox *mboxes; | |
38 | static DEFINE_RWLOCK(mboxes_lock); | |
39 | ||
40 | /* Mailbox Sequence Bit function */ | |
41 | void omap_mbox_init_seq(struct omap_mbox *mbox) | |
42 | { | |
43 | mbox_seq_init(mbox); | |
44 | } | |
45 | EXPORT_SYMBOL(omap_mbox_init_seq); | |
46 | ||
47 | /* | |
48 | * message sender | |
49 | */ | |
50 | static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void *arg) | |
51 | { | |
52 | int ret = 0, i = 1000; | |
53 | ||
54 | while (mbox_fifo_full(mbox)) { | |
55 | if (mbox->ops->type == OMAP_MBOX_TYPE2) | |
56 | return -1; | |
57 | if (--i == 0) | |
58 | return -1; | |
59 | udelay(1); | |
60 | } | |
61 | ||
62 | if (arg && mbox->txq->callback) { | |
63 | ret = mbox->txq->callback(arg); | |
64 | if (ret) | |
65 | goto out; | |
66 | } | |
67 | ||
68 | mbox_seq_toggle(mbox, &msg); | |
69 | mbox_fifo_write(mbox, msg); | |
70 | out: | |
71 | return ret; | |
72 | } | |
73 | ||
74 | int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void* arg) | |
75 | { | |
76 | struct request *rq; | |
77 | struct request_queue *q = mbox->txq->queue; | |
78 | int ret = 0; | |
79 | ||
80 | rq = blk_get_request(q, WRITE, GFP_ATOMIC); | |
81 | if (unlikely(!rq)) { | |
82 | ret = -ENOMEM; | |
83 | goto fail; | |
84 | } | |
85 | ||
86 | rq->data = (void *)msg; | |
87 | blk_insert_request(q, rq, 0, arg); | |
88 | ||
89 | schedule_work(&mbox->txq->work); | |
90 | fail: | |
91 | return ret; | |
92 | } | |
93 | EXPORT_SYMBOL(omap_mbox_msg_send); | |
94 | ||
95 | static void mbox_tx_work(struct work_struct *work) | |
96 | { | |
97 | int ret; | |
98 | struct request *rq; | |
99 | struct omap_mbox_queue *mq = container_of(work, | |
100 | struct omap_mbox_queue, work); | |
101 | struct omap_mbox *mbox = mq->queue->queuedata; | |
102 | struct request_queue *q = mbox->txq->queue; | |
103 | ||
104 | while (1) { | |
105 | spin_lock(q->queue_lock); | |
106 | rq = elv_next_request(q); | |
107 | spin_unlock(q->queue_lock); | |
108 | ||
109 | if (!rq) | |
110 | break; | |
111 | ||
112 | ret = __mbox_msg_send(mbox, (mbox_msg_t) rq->data, rq->special); | |
113 | if (ret) { | |
114 | enable_mbox_irq(mbox, IRQ_TX); | |
115 | return; | |
116 | } | |
117 | ||
118 | spin_lock(q->queue_lock); | |
119 | blkdev_dequeue_request(rq); | |
120 | end_that_request_last(rq, 0); | |
121 | spin_unlock(q->queue_lock); | |
122 | } | |
123 | } | |
124 | ||
125 | /* | |
126 | * Message receiver(workqueue) | |
127 | */ | |
128 | static void mbox_rx_work(struct work_struct *work) | |
129 | { | |
130 | struct omap_mbox_queue *mq = | |
131 | container_of(work, struct omap_mbox_queue, work); | |
132 | struct omap_mbox *mbox = mq->queue->queuedata; | |
133 | struct request_queue *q = mbox->rxq->queue; | |
134 | struct request *rq; | |
135 | mbox_msg_t msg; | |
136 | unsigned long flags; | |
137 | ||
138 | if (mbox->rxq->callback == NULL) { | |
139 | sysfs_notify(&mbox->dev.kobj, NULL, "mbox"); | |
140 | return; | |
141 | } | |
142 | ||
143 | while (1) { | |
144 | spin_lock_irqsave(q->queue_lock, flags); | |
145 | rq = elv_next_request(q); | |
146 | spin_unlock_irqrestore(q->queue_lock, flags); | |
147 | if (!rq) | |
148 | break; | |
149 | ||
150 | msg = (mbox_msg_t) rq->data; | |
151 | ||
152 | spin_lock_irqsave(q->queue_lock, flags); | |
153 | blkdev_dequeue_request(rq); | |
154 | end_that_request_last(rq, 0); | |
155 | spin_unlock_irqrestore(q->queue_lock, flags); | |
156 | ||
157 | mbox->rxq->callback((void *)msg); | |
158 | } | |
159 | } | |
160 | ||
161 | /* | |
162 | * Mailbox interrupt handler | |
163 | */ | |
165125e1 | 164 | static void mbox_txq_fn(struct request_queue * q) |
340a614a HD |
165 | { |
166 | } | |
167 | ||
165125e1 | 168 | static void mbox_rxq_fn(struct request_queue * q) |
340a614a HD |
169 | { |
170 | } | |
171 | ||
172 | static void __mbox_tx_interrupt(struct omap_mbox *mbox) | |
173 | { | |
174 | disable_mbox_irq(mbox, IRQ_TX); | |
175 | ack_mbox_irq(mbox, IRQ_TX); | |
176 | schedule_work(&mbox->txq->work); | |
177 | } | |
178 | ||
179 | static void __mbox_rx_interrupt(struct omap_mbox *mbox) | |
180 | { | |
181 | struct request *rq; | |
182 | mbox_msg_t msg; | |
165125e1 | 183 | struct request_queue *q = mbox->rxq->queue; |
340a614a HD |
184 | |
185 | disable_mbox_irq(mbox, IRQ_RX); | |
186 | ||
187 | while (!mbox_fifo_empty(mbox)) { | |
188 | rq = blk_get_request(q, WRITE, GFP_ATOMIC); | |
189 | if (unlikely(!rq)) | |
190 | goto nomem; | |
191 | ||
192 | msg = mbox_fifo_read(mbox); | |
193 | rq->data = (void *)msg; | |
194 | ||
195 | if (unlikely(mbox_seq_test(mbox, msg))) { | |
196 | pr_info("mbox: Illegal seq bit!(%08x)\n", msg); | |
197 | if (mbox->err_notify) | |
198 | mbox->err_notify(); | |
199 | } | |
200 | ||
201 | blk_insert_request(q, rq, 0, NULL); | |
202 | if (mbox->ops->type == OMAP_MBOX_TYPE1) | |
203 | break; | |
204 | } | |
205 | ||
206 | /* no more messages in the fifo. clear IRQ source. */ | |
207 | ack_mbox_irq(mbox, IRQ_RX); | |
208 | enable_mbox_irq(mbox, IRQ_RX); | |
209 | nomem: | |
210 | schedule_work(&mbox->rxq->work); | |
211 | } | |
212 | ||
213 | static irqreturn_t mbox_interrupt(int irq, void *p) | |
214 | { | |
215 | struct omap_mbox *mbox = (struct omap_mbox *)p; | |
216 | ||
217 | if (is_mbox_irq(mbox, IRQ_TX)) | |
218 | __mbox_tx_interrupt(mbox); | |
219 | ||
220 | if (is_mbox_irq(mbox, IRQ_RX)) | |
221 | __mbox_rx_interrupt(mbox); | |
222 | ||
223 | return IRQ_HANDLED; | |
224 | } | |
225 | ||
226 | /* | |
227 | * sysfs files | |
228 | */ | |
229 | static ssize_t | |
230 | omap_mbox_write(struct device *dev, struct device_attribute *attr, | |
231 | const char * buf, size_t count) | |
232 | { | |
233 | int ret; | |
234 | mbox_msg_t *p = (mbox_msg_t *)buf; | |
235 | struct omap_mbox *mbox = dev_get_drvdata(dev); | |
236 | ||
237 | for (; count >= sizeof(mbox_msg_t); count -= sizeof(mbox_msg_t)) { | |
238 | ret = omap_mbox_msg_send(mbox, be32_to_cpu(*p), NULL); | |
239 | if (ret) | |
240 | return -EAGAIN; | |
241 | p++; | |
242 | } | |
243 | ||
244 | return (size_t)((char *)p - buf); | |
245 | } | |
246 | ||
247 | static ssize_t | |
248 | omap_mbox_read(struct device *dev, struct device_attribute *attr, char *buf) | |
249 | { | |
250 | unsigned long flags; | |
251 | struct request *rq; | |
252 | mbox_msg_t *p = (mbox_msg_t *) buf; | |
253 | struct omap_mbox *mbox = dev_get_drvdata(dev); | |
254 | struct request_queue *q = mbox->rxq->queue; | |
255 | ||
256 | while (1) { | |
257 | spin_lock_irqsave(q->queue_lock, flags); | |
258 | rq = elv_next_request(q); | |
259 | spin_unlock_irqrestore(q->queue_lock, flags); | |
260 | ||
261 | if (!rq) | |
262 | break; | |
263 | ||
264 | *p = (mbox_msg_t) rq->data; | |
265 | ||
266 | spin_lock_irqsave(q->queue_lock, flags); | |
267 | blkdev_dequeue_request(rq); | |
268 | end_that_request_last(rq, 0); | |
269 | spin_unlock_irqrestore(q->queue_lock, flags); | |
270 | ||
271 | if (unlikely(mbox_seq_test(mbox, *p))) { | |
272 | pr_info("mbox: Illegal seq bit!(%08x) ignored\n", *p); | |
273 | continue; | |
274 | } | |
275 | p++; | |
276 | } | |
277 | ||
278 | pr_debug("%02x %02x %02x %02x\n", buf[0], buf[1], buf[2], buf[3]); | |
279 | ||
280 | return (size_t) ((char *)p - buf); | |
281 | } | |
282 | ||
283 | static DEVICE_ATTR(mbox, S_IRUGO | S_IWUSR, omap_mbox_read, omap_mbox_write); | |
284 | ||
285 | static ssize_t mbox_show(struct class *class, char *buf) | |
286 | { | |
287 | return sprintf(buf, "mbox"); | |
288 | } | |
289 | ||
290 | static CLASS_ATTR(mbox, S_IRUGO, mbox_show, NULL); | |
291 | ||
292 | static struct class omap_mbox_class = { | |
293 | .name = "omap_mbox", | |
294 | }; | |
295 | ||
296 | static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox, | |
297 | request_fn_proc * proc, | |
298 | void (*work) (struct work_struct *)) | |
299 | { | |
165125e1 | 300 | struct request_queue *q; |
340a614a HD |
301 | struct omap_mbox_queue *mq; |
302 | ||
303 | mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL); | |
304 | if (!mq) | |
305 | return NULL; | |
306 | ||
307 | spin_lock_init(&mq->lock); | |
308 | ||
309 | q = blk_init_queue(proc, &mq->lock); | |
310 | if (!q) | |
311 | goto error; | |
312 | q->queuedata = mbox; | |
313 | mq->queue = q; | |
314 | ||
315 | INIT_WORK(&mq->work, work); | |
316 | ||
317 | return mq; | |
318 | error: | |
319 | kfree(mq); | |
320 | return NULL; | |
321 | } | |
322 | ||
323 | static void mbox_queue_free(struct omap_mbox_queue *q) | |
324 | { | |
325 | blk_cleanup_queue(q->queue); | |
326 | kfree(q); | |
327 | } | |
328 | ||
329 | static int omap_mbox_init(struct omap_mbox *mbox) | |
330 | { | |
331 | int ret; | |
332 | struct omap_mbox_queue *mq; | |
333 | ||
334 | if (likely(mbox->ops->startup)) { | |
335 | ret = mbox->ops->startup(mbox); | |
336 | if (unlikely(ret)) | |
337 | return ret; | |
338 | } | |
339 | ||
340 | mbox->dev.class = &omap_mbox_class; | |
341 | strlcpy(mbox->dev.bus_id, mbox->name, KOBJ_NAME_LEN); | |
342 | dev_set_drvdata(&mbox->dev, mbox); | |
343 | ||
344 | ret = device_register(&mbox->dev); | |
345 | if (unlikely(ret)) | |
346 | goto fail_device_reg; | |
347 | ||
348 | ret = device_create_file(&mbox->dev, &dev_attr_mbox); | |
349 | if (unlikely(ret)) { | |
350 | printk(KERN_ERR | |
351 | "device_create_file failed: %d\n", ret); | |
352 | goto fail_create_mbox; | |
353 | } | |
354 | ||
355 | ret = request_irq(mbox->irq, mbox_interrupt, IRQF_DISABLED, | |
356 | mbox->name, mbox); | |
357 | if (unlikely(ret)) { | |
358 | printk(KERN_ERR | |
359 | "failed to register mailbox interrupt:%d\n", ret); | |
360 | goto fail_request_irq; | |
361 | } | |
362 | enable_mbox_irq(mbox, IRQ_RX); | |
363 | ||
364 | mq = mbox_queue_alloc(mbox, mbox_txq_fn, mbox_tx_work); | |
365 | if (!mq) { | |
366 | ret = -ENOMEM; | |
367 | goto fail_alloc_txq; | |
368 | } | |
369 | mbox->txq = mq; | |
370 | ||
371 | mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work); | |
372 | if (!mq) { | |
373 | ret = -ENOMEM; | |
374 | goto fail_alloc_rxq; | |
375 | } | |
376 | mbox->rxq = mq; | |
377 | ||
378 | return 0; | |
379 | ||
380 | fail_alloc_rxq: | |
381 | mbox_queue_free(mbox->txq); | |
382 | fail_alloc_txq: | |
383 | free_irq(mbox->irq, mbox); | |
384 | fail_request_irq: | |
385 | device_remove_file(&mbox->dev, &dev_attr_mbox); | |
386 | fail_create_mbox: | |
387 | device_unregister(&mbox->dev); | |
388 | fail_device_reg: | |
389 | if (unlikely(mbox->ops->shutdown)) | |
390 | mbox->ops->shutdown(mbox); | |
391 | ||
392 | return ret; | |
393 | } | |
394 | ||
395 | static void omap_mbox_fini(struct omap_mbox *mbox) | |
396 | { | |
397 | mbox_queue_free(mbox->txq); | |
398 | mbox_queue_free(mbox->rxq); | |
399 | ||
400 | free_irq(mbox->irq, mbox); | |
401 | device_remove_file(&mbox->dev, &dev_attr_mbox); | |
402 | class_unregister(&omap_mbox_class); | |
403 | ||
404 | if (unlikely(mbox->ops->shutdown)) | |
405 | mbox->ops->shutdown(mbox); | |
406 | } | |
407 | ||
408 | static struct omap_mbox **find_mboxes(const char *name) | |
409 | { | |
410 | struct omap_mbox **p; | |
411 | ||
412 | for (p = &mboxes; *p; p = &(*p)->next) { | |
413 | if (strcmp((*p)->name, name) == 0) | |
414 | break; | |
415 | } | |
416 | ||
417 | return p; | |
418 | } | |
419 | ||
420 | struct omap_mbox *omap_mbox_get(const char *name) | |
421 | { | |
422 | struct omap_mbox *mbox; | |
423 | int ret; | |
424 | ||
425 | read_lock(&mboxes_lock); | |
426 | mbox = *(find_mboxes(name)); | |
427 | if (mbox == NULL) { | |
428 | read_unlock(&mboxes_lock); | |
429 | return ERR_PTR(-ENOENT); | |
430 | } | |
431 | ||
432 | read_unlock(&mboxes_lock); | |
433 | ||
434 | ret = omap_mbox_init(mbox); | |
435 | if (ret) | |
436 | return ERR_PTR(-ENODEV); | |
437 | ||
438 | return mbox; | |
439 | } | |
440 | EXPORT_SYMBOL(omap_mbox_get); | |
441 | ||
442 | void omap_mbox_put(struct omap_mbox *mbox) | |
443 | { | |
444 | omap_mbox_fini(mbox); | |
445 | } | |
446 | EXPORT_SYMBOL(omap_mbox_put); | |
447 | ||
448 | int omap_mbox_register(struct omap_mbox *mbox) | |
449 | { | |
450 | int ret = 0; | |
451 | struct omap_mbox **tmp; | |
452 | ||
453 | if (!mbox) | |
454 | return -EINVAL; | |
455 | if (mbox->next) | |
456 | return -EBUSY; | |
457 | ||
458 | write_lock(&mboxes_lock); | |
459 | tmp = find_mboxes(mbox->name); | |
460 | if (*tmp) | |
461 | ret = -EBUSY; | |
462 | else | |
463 | *tmp = mbox; | |
464 | write_unlock(&mboxes_lock); | |
465 | ||
466 | return ret; | |
467 | } | |
468 | EXPORT_SYMBOL(omap_mbox_register); | |
469 | ||
470 | int omap_mbox_unregister(struct omap_mbox *mbox) | |
471 | { | |
472 | struct omap_mbox **tmp; | |
473 | ||
474 | write_lock(&mboxes_lock); | |
475 | tmp = &mboxes; | |
476 | while (*tmp) { | |
477 | if (mbox == *tmp) { | |
478 | *tmp = mbox->next; | |
479 | mbox->next = NULL; | |
480 | write_unlock(&mboxes_lock); | |
481 | return 0; | |
482 | } | |
483 | tmp = &(*tmp)->next; | |
484 | } | |
485 | write_unlock(&mboxes_lock); | |
486 | ||
487 | return -EINVAL; | |
488 | } | |
489 | EXPORT_SYMBOL(omap_mbox_unregister); | |
490 | ||
491 | static int __init omap_mbox_class_init(void) | |
492 | { | |
493 | int ret = class_register(&omap_mbox_class); | |
494 | if (!ret) | |
495 | ret = class_create_file(&omap_mbox_class, &class_attr_mbox); | |
496 | ||
497 | return ret; | |
498 | } | |
499 | ||
500 | static void __exit omap_mbox_class_exit(void) | |
501 | { | |
502 | class_remove_file(&omap_mbox_class, &class_attr_mbox); | |
503 | class_unregister(&omap_mbox_class); | |
504 | } | |
505 | ||
506 | subsys_initcall(omap_mbox_class_init); | |
507 | module_exit(omap_mbox_class_exit); | |
508 | ||
509 | MODULE_LICENSE("GPL"); |