1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
4 */
5
6 #include <linux/clk/tegra.h>
7 #include <linux/genalloc.h>
8 #include <linux/mailbox_client.h>
9 #include <linux/module.h>
10 #include <linux/of.h>
11 #include <linux/of_address.h>
12 #include <linux/of_device.h>
13 #include <linux/platform_device.h>
14 #include <linux/pm.h>
15 #include <linux/semaphore.h>
16 #include <linux/sched/clock.h>
17
18 #include <soc/tegra/bpmp.h>
19 #include <soc/tegra/bpmp-abi.h>
20 #include <soc/tegra/ivc.h>
21
22 #include "bpmp-private.h"
23
24 #define MSG_ACK BIT(0)
25 #define MSG_RING BIT(1)
26 #define TAG_SZ 32
27
28 static inline struct tegra_bpmp *
mbox_client_to_bpmp(struct mbox_client * client)29 mbox_client_to_bpmp(struct mbox_client *client)
30 {
31 return container_of(client, struct tegra_bpmp, mbox.client);
32 }
33
34 static inline const struct tegra_bpmp_ops *
channel_to_ops(struct tegra_bpmp_channel * channel)35 channel_to_ops(struct tegra_bpmp_channel *channel)
36 {
37 struct tegra_bpmp *bpmp = channel->bpmp;
38
39 return bpmp->soc->ops;
40 }
41
tegra_bpmp_get(struct device * dev)42 struct tegra_bpmp *tegra_bpmp_get(struct device *dev)
43 {
44 struct platform_device *pdev;
45 struct tegra_bpmp *bpmp;
46 struct device_node *np;
47
48 np = of_parse_phandle(dev->of_node, "nvidia,bpmp", 0);
49 if (!np)
50 return ERR_PTR(-ENOENT);
51
52 pdev = of_find_device_by_node(np);
53 if (!pdev) {
54 bpmp = ERR_PTR(-ENODEV);
55 goto put;
56 }
57
58 bpmp = platform_get_drvdata(pdev);
59 if (!bpmp) {
60 bpmp = ERR_PTR(-EPROBE_DEFER);
61 put_device(&pdev->dev);
62 goto put;
63 }
64
65 put:
66 of_node_put(np);
67 return bpmp;
68 }
69 EXPORT_SYMBOL_GPL(tegra_bpmp_get);
70
tegra_bpmp_put(struct tegra_bpmp * bpmp)71 void tegra_bpmp_put(struct tegra_bpmp *bpmp)
72 {
73 if (bpmp)
74 put_device(bpmp->dev);
75 }
76 EXPORT_SYMBOL_GPL(tegra_bpmp_put);
77
78 static int
tegra_bpmp_channel_get_thread_index(struct tegra_bpmp_channel * channel)79 tegra_bpmp_channel_get_thread_index(struct tegra_bpmp_channel *channel)
80 {
81 struct tegra_bpmp *bpmp = channel->bpmp;
82 unsigned int count;
83 int index;
84
85 count = bpmp->soc->channels.thread.count;
86
87 index = channel - channel->bpmp->threaded_channels;
88 if (index < 0 || index >= count)
89 return -EINVAL;
90
91 return index;
92 }
93
tegra_bpmp_message_valid(const struct tegra_bpmp_message * msg)94 static bool tegra_bpmp_message_valid(const struct tegra_bpmp_message *msg)
95 {
96 return (msg->tx.size <= MSG_DATA_MIN_SZ) &&
97 (msg->rx.size <= MSG_DATA_MIN_SZ) &&
98 (msg->tx.size == 0 || msg->tx.data) &&
99 (msg->rx.size == 0 || msg->rx.data);
100 }
101
tegra_bpmp_is_response_ready(struct tegra_bpmp_channel * channel)102 static bool tegra_bpmp_is_response_ready(struct tegra_bpmp_channel *channel)
103 {
104 const struct tegra_bpmp_ops *ops = channel_to_ops(channel);
105
106 return ops->is_response_ready(channel);
107 }
108
tegra_bpmp_is_request_ready(struct tegra_bpmp_channel * channel)109 static bool tegra_bpmp_is_request_ready(struct tegra_bpmp_channel *channel)
110 {
111 const struct tegra_bpmp_ops *ops = channel_to_ops(channel);
112
113 return ops->is_request_ready(channel);
114 }
115
tegra_bpmp_wait_response(struct tegra_bpmp_channel * channel)116 static int tegra_bpmp_wait_response(struct tegra_bpmp_channel *channel)
117 {
118 unsigned long timeout = channel->bpmp->soc->channels.cpu_tx.timeout;
119 ktime_t end;
120
121 end = ktime_add_us(ktime_get(), timeout);
122
123 do {
124 if (tegra_bpmp_is_response_ready(channel))
125 return 0;
126 } while (ktime_before(ktime_get(), end));
127
128 return -ETIMEDOUT;
129 }
130
tegra_bpmp_ack_response(struct tegra_bpmp_channel * channel)131 static int tegra_bpmp_ack_response(struct tegra_bpmp_channel *channel)
132 {
133 const struct tegra_bpmp_ops *ops = channel_to_ops(channel);
134
135 return ops->ack_response(channel);
136 }
137
tegra_bpmp_ack_request(struct tegra_bpmp_channel * channel)138 static int tegra_bpmp_ack_request(struct tegra_bpmp_channel *channel)
139 {
140 const struct tegra_bpmp_ops *ops = channel_to_ops(channel);
141
142 return ops->ack_request(channel);
143 }
144
145 static bool
tegra_bpmp_is_request_channel_free(struct tegra_bpmp_channel * channel)146 tegra_bpmp_is_request_channel_free(struct tegra_bpmp_channel *channel)
147 {
148 const struct tegra_bpmp_ops *ops = channel_to_ops(channel);
149
150 return ops->is_request_channel_free(channel);
151 }
152
153 static bool
tegra_bpmp_is_response_channel_free(struct tegra_bpmp_channel * channel)154 tegra_bpmp_is_response_channel_free(struct tegra_bpmp_channel *channel)
155 {
156 const struct tegra_bpmp_ops *ops = channel_to_ops(channel);
157
158 return ops->is_response_channel_free(channel);
159 }
160
161 static int
tegra_bpmp_wait_request_channel_free(struct tegra_bpmp_channel * channel)162 tegra_bpmp_wait_request_channel_free(struct tegra_bpmp_channel *channel)
163 {
164 unsigned long timeout = channel->bpmp->soc->channels.cpu_tx.timeout;
165 ktime_t start, now;
166
167 start = ns_to_ktime(local_clock());
168
169 do {
170 if (tegra_bpmp_is_request_channel_free(channel))
171 return 0;
172
173 now = ns_to_ktime(local_clock());
174 } while (ktime_us_delta(now, start) < timeout);
175
176 return -ETIMEDOUT;
177 }
178
tegra_bpmp_post_request(struct tegra_bpmp_channel * channel)179 static int tegra_bpmp_post_request(struct tegra_bpmp_channel *channel)
180 {
181 const struct tegra_bpmp_ops *ops = channel_to_ops(channel);
182
183 return ops->post_request(channel);
184 }
185
tegra_bpmp_post_response(struct tegra_bpmp_channel * channel)186 static int tegra_bpmp_post_response(struct tegra_bpmp_channel *channel)
187 {
188 const struct tegra_bpmp_ops *ops = channel_to_ops(channel);
189
190 return ops->post_response(channel);
191 }
192
tegra_bpmp_ring_doorbell(struct tegra_bpmp * bpmp)193 static int tegra_bpmp_ring_doorbell(struct tegra_bpmp *bpmp)
194 {
195 return bpmp->soc->ops->ring_doorbell(bpmp);
196 }
197
__tegra_bpmp_channel_read(struct tegra_bpmp_channel * channel,void * data,size_t size,int * ret)198 static ssize_t __tegra_bpmp_channel_read(struct tegra_bpmp_channel *channel,
199 void *data, size_t size, int *ret)
200 {
201 int err;
202
203 if (data && size > 0)
204 tegra_bpmp_mb_read(data, &channel->ib, size);
205
206 err = tegra_bpmp_ack_response(channel);
207 if (err < 0)
208 return err;
209
210 *ret = tegra_bpmp_mb_read_field(&channel->ib, code);
211
212 return 0;
213 }
214
tegra_bpmp_channel_read(struct tegra_bpmp_channel * channel,void * data,size_t size,int * ret)215 static ssize_t tegra_bpmp_channel_read(struct tegra_bpmp_channel *channel,
216 void *data, size_t size, int *ret)
217 {
218 struct tegra_bpmp *bpmp = channel->bpmp;
219 unsigned long flags;
220 ssize_t err;
221 int index;
222
223 index = tegra_bpmp_channel_get_thread_index(channel);
224 if (index < 0) {
225 err = index;
226 goto unlock;
227 }
228
229 spin_lock_irqsave(&bpmp->lock, flags);
230 err = __tegra_bpmp_channel_read(channel, data, size, ret);
231 clear_bit(index, bpmp->threaded.allocated);
232 spin_unlock_irqrestore(&bpmp->lock, flags);
233
234 unlock:
235 up(&bpmp->threaded.lock);
236
237 return err;
238 }
239
__tegra_bpmp_channel_write(struct tegra_bpmp_channel * channel,unsigned int mrq,unsigned long flags,const void * data,size_t size)240 static ssize_t __tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel,
241 unsigned int mrq, unsigned long flags,
242 const void *data, size_t size)
243 {
244 tegra_bpmp_mb_write_field(&channel->ob, code, mrq);
245 tegra_bpmp_mb_write_field(&channel->ob, flags, flags);
246
247 if (data && size > 0)
248 tegra_bpmp_mb_write(&channel->ob, data, size);
249
250 return tegra_bpmp_post_request(channel);
251 }
252
253 static struct tegra_bpmp_channel *
tegra_bpmp_write_threaded(struct tegra_bpmp * bpmp,unsigned int mrq,const void * data,size_t size)254 tegra_bpmp_write_threaded(struct tegra_bpmp *bpmp, unsigned int mrq,
255 const void *data, size_t size)
256 {
257 unsigned long timeout = bpmp->soc->channels.thread.timeout;
258 unsigned int count = bpmp->soc->channels.thread.count;
259 struct tegra_bpmp_channel *channel;
260 unsigned long flags;
261 unsigned int index;
262 int err;
263
264 err = down_timeout(&bpmp->threaded.lock, usecs_to_jiffies(timeout));
265 if (err < 0)
266 return ERR_PTR(err);
267
268 spin_lock_irqsave(&bpmp->lock, flags);
269
270 index = find_first_zero_bit(bpmp->threaded.allocated, count);
271 if (index == count) {
272 err = -EBUSY;
273 goto unlock;
274 }
275
276 channel = &bpmp->threaded_channels[index];
277
278 if (!tegra_bpmp_is_request_channel_free(channel)) {
279 err = -EBUSY;
280 goto unlock;
281 }
282
283 set_bit(index, bpmp->threaded.allocated);
284
285 err = __tegra_bpmp_channel_write(channel, mrq, MSG_ACK | MSG_RING,
286 data, size);
287 if (err < 0)
288 goto clear_allocated;
289
290 set_bit(index, bpmp->threaded.busy);
291
292 spin_unlock_irqrestore(&bpmp->lock, flags);
293 return channel;
294
295 clear_allocated:
296 clear_bit(index, bpmp->threaded.allocated);
297 unlock:
298 spin_unlock_irqrestore(&bpmp->lock, flags);
299 up(&bpmp->threaded.lock);
300
301 return ERR_PTR(err);
302 }
303
tegra_bpmp_channel_write(struct tegra_bpmp_channel * channel,unsigned int mrq,unsigned long flags,const void * data,size_t size)304 static ssize_t tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel,
305 unsigned int mrq, unsigned long flags,
306 const void *data, size_t size)
307 {
308 int err;
309
310 err = tegra_bpmp_wait_request_channel_free(channel);
311 if (err < 0)
312 return err;
313
314 return __tegra_bpmp_channel_write(channel, mrq, flags, data, size);
315 }
316
tegra_bpmp_transfer_atomic(struct tegra_bpmp * bpmp,struct tegra_bpmp_message * msg)317 int tegra_bpmp_transfer_atomic(struct tegra_bpmp *bpmp,
318 struct tegra_bpmp_message *msg)
319 {
320 struct tegra_bpmp_channel *channel;
321 int err;
322
323 if (WARN_ON(!irqs_disabled()))
324 return -EPERM;
325
326 if (!tegra_bpmp_message_valid(msg))
327 return -EINVAL;
328
329 channel = bpmp->tx_channel;
330
331 spin_lock(&bpmp->atomic_tx_lock);
332
333 err = tegra_bpmp_channel_write(channel, msg->mrq, MSG_ACK,
334 msg->tx.data, msg->tx.size);
335 if (err < 0) {
336 spin_unlock(&bpmp->atomic_tx_lock);
337 return err;
338 }
339
340 spin_unlock(&bpmp->atomic_tx_lock);
341
342 err = tegra_bpmp_ring_doorbell(bpmp);
343 if (err < 0)
344 return err;
345
346 err = tegra_bpmp_wait_response(channel);
347 if (err < 0)
348 return err;
349
350 return __tegra_bpmp_channel_read(channel, msg->rx.data, msg->rx.size,
351 &msg->rx.ret);
352 }
353 EXPORT_SYMBOL_GPL(tegra_bpmp_transfer_atomic);
354
tegra_bpmp_transfer(struct tegra_bpmp * bpmp,struct tegra_bpmp_message * msg)355 int tegra_bpmp_transfer(struct tegra_bpmp *bpmp,
356 struct tegra_bpmp_message *msg)
357 {
358 struct tegra_bpmp_channel *channel;
359 unsigned long timeout;
360 int err;
361
362 if (WARN_ON(irqs_disabled()))
363 return -EPERM;
364
365 if (!tegra_bpmp_message_valid(msg))
366 return -EINVAL;
367
368 channel = tegra_bpmp_write_threaded(bpmp, msg->mrq, msg->tx.data,
369 msg->tx.size);
370 if (IS_ERR(channel))
371 return PTR_ERR(channel);
372
373 err = tegra_bpmp_ring_doorbell(bpmp);
374 if (err < 0)
375 return err;
376
377 timeout = usecs_to_jiffies(bpmp->soc->channels.thread.timeout);
378
379 err = wait_for_completion_timeout(&channel->completion, timeout);
380 if (err == 0)
381 return -ETIMEDOUT;
382
383 return tegra_bpmp_channel_read(channel, msg->rx.data, msg->rx.size,
384 &msg->rx.ret);
385 }
386 EXPORT_SYMBOL_GPL(tegra_bpmp_transfer);
387
tegra_bpmp_find_mrq(struct tegra_bpmp * bpmp,unsigned int mrq)388 static struct tegra_bpmp_mrq *tegra_bpmp_find_mrq(struct tegra_bpmp *bpmp,
389 unsigned int mrq)
390 {
391 struct tegra_bpmp_mrq *entry;
392
393 list_for_each_entry(entry, &bpmp->mrqs, list)
394 if (entry->mrq == mrq)
395 return entry;
396
397 return NULL;
398 }
399
tegra_bpmp_mrq_return(struct tegra_bpmp_channel * channel,int code,const void * data,size_t size)400 void tegra_bpmp_mrq_return(struct tegra_bpmp_channel *channel, int code,
401 const void *data, size_t size)
402 {
403 unsigned long flags = tegra_bpmp_mb_read_field(&channel->ib, flags);
404 struct tegra_bpmp *bpmp = channel->bpmp;
405 int err;
406
407 if (WARN_ON(size > MSG_DATA_MIN_SZ))
408 return;
409
410 err = tegra_bpmp_ack_request(channel);
411 if (WARN_ON(err < 0))
412 return;
413
414 if ((flags & MSG_ACK) == 0)
415 return;
416
417 if (WARN_ON(!tegra_bpmp_is_response_channel_free(channel)))
418 return;
419
420 tegra_bpmp_mb_write_field(&channel->ob, code, code);
421
422 if (data && size > 0)
423 tegra_bpmp_mb_write(&channel->ob, data, size);
424
425 err = tegra_bpmp_post_response(channel);
426 if (WARN_ON(err < 0))
427 return;
428
429 if (flags & MSG_RING) {
430 err = tegra_bpmp_ring_doorbell(bpmp);
431 if (WARN_ON(err < 0))
432 return;
433 }
434 }
435 EXPORT_SYMBOL_GPL(tegra_bpmp_mrq_return);
436
tegra_bpmp_handle_mrq(struct tegra_bpmp * bpmp,unsigned int mrq,struct tegra_bpmp_channel * channel)437 static void tegra_bpmp_handle_mrq(struct tegra_bpmp *bpmp,
438 unsigned int mrq,
439 struct tegra_bpmp_channel *channel)
440 {
441 struct tegra_bpmp_mrq *entry;
442 u32 zero = 0;
443
444 spin_lock(&bpmp->lock);
445
446 entry = tegra_bpmp_find_mrq(bpmp, mrq);
447 if (!entry) {
448 spin_unlock(&bpmp->lock);
449 tegra_bpmp_mrq_return(channel, -EINVAL, &zero, sizeof(zero));
450 return;
451 }
452
453 entry->handler(mrq, channel, entry->data);
454
455 spin_unlock(&bpmp->lock);
456 }
457
tegra_bpmp_request_mrq(struct tegra_bpmp * bpmp,unsigned int mrq,tegra_bpmp_mrq_handler_t handler,void * data)458 int tegra_bpmp_request_mrq(struct tegra_bpmp *bpmp, unsigned int mrq,
459 tegra_bpmp_mrq_handler_t handler, void *data)
460 {
461 struct tegra_bpmp_mrq *entry;
462 unsigned long flags;
463
464 if (!handler)
465 return -EINVAL;
466
467 entry = devm_kzalloc(bpmp->dev, sizeof(*entry), GFP_KERNEL);
468 if (!entry)
469 return -ENOMEM;
470
471 spin_lock_irqsave(&bpmp->lock, flags);
472
473 entry->mrq = mrq;
474 entry->handler = handler;
475 entry->data = data;
476 list_add(&entry->list, &bpmp->mrqs);
477
478 spin_unlock_irqrestore(&bpmp->lock, flags);
479
480 return 0;
481 }
482 EXPORT_SYMBOL_GPL(tegra_bpmp_request_mrq);
483
tegra_bpmp_free_mrq(struct tegra_bpmp * bpmp,unsigned int mrq,void * data)484 void tegra_bpmp_free_mrq(struct tegra_bpmp *bpmp, unsigned int mrq, void *data)
485 {
486 struct tegra_bpmp_mrq *entry;
487 unsigned long flags;
488
489 spin_lock_irqsave(&bpmp->lock, flags);
490
491 entry = tegra_bpmp_find_mrq(bpmp, mrq);
492 if (!entry)
493 goto unlock;
494
495 list_del(&entry->list);
496 devm_kfree(bpmp->dev, entry);
497
498 unlock:
499 spin_unlock_irqrestore(&bpmp->lock, flags);
500 }
501 EXPORT_SYMBOL_GPL(tegra_bpmp_free_mrq);
502
tegra_bpmp_mrq_is_supported(struct tegra_bpmp * bpmp,unsigned int mrq)503 bool tegra_bpmp_mrq_is_supported(struct tegra_bpmp *bpmp, unsigned int mrq)
504 {
505 struct mrq_query_abi_request req = { .mrq = mrq };
506 struct mrq_query_abi_response resp;
507 struct tegra_bpmp_message msg = {
508 .mrq = MRQ_QUERY_ABI,
509 .tx = {
510 .data = &req,
511 .size = sizeof(req),
512 },
513 .rx = {
514 .data = &resp,
515 .size = sizeof(resp),
516 },
517 };
518 int err;
519
520 err = tegra_bpmp_transfer(bpmp, &msg);
521 if (err || msg.rx.ret)
522 return false;
523
524 return resp.status == 0;
525 }
526 EXPORT_SYMBOL_GPL(tegra_bpmp_mrq_is_supported);
527
tegra_bpmp_mrq_handle_ping(unsigned int mrq,struct tegra_bpmp_channel * channel,void * data)528 static void tegra_bpmp_mrq_handle_ping(unsigned int mrq,
529 struct tegra_bpmp_channel *channel,
530 void *data)
531 {
532 struct mrq_ping_request request;
533 struct mrq_ping_response response;
534
535 tegra_bpmp_mb_read(&request, &channel->ib, sizeof(request));
536
537 memset(&response, 0, sizeof(response));
538 response.reply = request.challenge << 1;
539
540 tegra_bpmp_mrq_return(channel, 0, &response, sizeof(response));
541 }
542
tegra_bpmp_ping(struct tegra_bpmp * bpmp)543 static int tegra_bpmp_ping(struct tegra_bpmp *bpmp)
544 {
545 struct mrq_ping_response response;
546 struct mrq_ping_request request;
547 struct tegra_bpmp_message msg;
548 unsigned long flags;
549 ktime_t start, end;
550 int err;
551
552 memset(&request, 0, sizeof(request));
553 request.challenge = 1;
554
555 memset(&response, 0, sizeof(response));
556
557 memset(&msg, 0, sizeof(msg));
558 msg.mrq = MRQ_PING;
559 msg.tx.data = &request;
560 msg.tx.size = sizeof(request);
561 msg.rx.data = &response;
562 msg.rx.size = sizeof(response);
563
564 local_irq_save(flags);
565 start = ktime_get();
566 err = tegra_bpmp_transfer_atomic(bpmp, &msg);
567 end = ktime_get();
568 local_irq_restore(flags);
569
570 if (!err)
571 dev_dbg(bpmp->dev,
572 "ping ok: challenge: %u, response: %u, time: %lld\n",
573 request.challenge, response.reply,
574 ktime_to_us(ktime_sub(end, start)));
575
576 return err;
577 }
578
579 /* deprecated version of tag query */
tegra_bpmp_get_firmware_tag_old(struct tegra_bpmp * bpmp,char * tag,size_t size)580 static int tegra_bpmp_get_firmware_tag_old(struct tegra_bpmp *bpmp, char *tag,
581 size_t size)
582 {
583 struct mrq_query_tag_request request;
584 struct tegra_bpmp_message msg;
585 unsigned long flags;
586 dma_addr_t phys;
587 void *virt;
588 int err;
589
590 if (size != TAG_SZ)
591 return -EINVAL;
592
593 virt = dma_alloc_coherent(bpmp->dev, TAG_SZ, &phys,
594 GFP_KERNEL | GFP_DMA32);
595 if (!virt)
596 return -ENOMEM;
597
598 memset(&request, 0, sizeof(request));
599 request.addr = phys;
600
601 memset(&msg, 0, sizeof(msg));
602 msg.mrq = MRQ_QUERY_TAG;
603 msg.tx.data = &request;
604 msg.tx.size = sizeof(request);
605
606 local_irq_save(flags);
607 err = tegra_bpmp_transfer_atomic(bpmp, &msg);
608 local_irq_restore(flags);
609
610 if (err == 0)
611 memcpy(tag, virt, TAG_SZ);
612
613 dma_free_coherent(bpmp->dev, TAG_SZ, virt, phys);
614
615 return err;
616 }
617
tegra_bpmp_get_firmware_tag(struct tegra_bpmp * bpmp,char * tag,size_t size)618 static int tegra_bpmp_get_firmware_tag(struct tegra_bpmp *bpmp, char *tag,
619 size_t size)
620 {
621 if (tegra_bpmp_mrq_is_supported(bpmp, MRQ_QUERY_FW_TAG)) {
622 struct mrq_query_fw_tag_response resp;
623 struct tegra_bpmp_message msg = {
624 .mrq = MRQ_QUERY_FW_TAG,
625 .rx = {
626 .data = &resp,
627 .size = sizeof(resp),
628 },
629 };
630 int err;
631
632 if (size != sizeof(resp.tag))
633 return -EINVAL;
634
635 err = tegra_bpmp_transfer(bpmp, &msg);
636
637 if (err)
638 return err;
639 if (msg.rx.ret < 0)
640 return -EINVAL;
641
642 memcpy(tag, resp.tag, sizeof(resp.tag));
643 return 0;
644 }
645
646 return tegra_bpmp_get_firmware_tag_old(bpmp, tag, size);
647 }
648
tegra_bpmp_channel_signal(struct tegra_bpmp_channel * channel)649 static void tegra_bpmp_channel_signal(struct tegra_bpmp_channel *channel)
650 {
651 unsigned long flags = tegra_bpmp_mb_read_field(&channel->ob, flags);
652
653 if ((flags & MSG_RING) == 0)
654 return;
655
656 complete(&channel->completion);
657 }
658
tegra_bpmp_handle_rx(struct tegra_bpmp * bpmp)659 void tegra_bpmp_handle_rx(struct tegra_bpmp *bpmp)
660 {
661 struct tegra_bpmp_channel *channel;
662 unsigned int i, count;
663 unsigned long *busy;
664
665 channel = bpmp->rx_channel;
666 count = bpmp->soc->channels.thread.count;
667 busy = bpmp->threaded.busy;
668
669 if (tegra_bpmp_is_request_ready(channel)) {
670 unsigned int mrq = tegra_bpmp_mb_read_field(&channel->ib, code);
671
672 tegra_bpmp_handle_mrq(bpmp, mrq, channel);
673 }
674
675 spin_lock(&bpmp->lock);
676
677 for_each_set_bit(i, busy, count) {
678 struct tegra_bpmp_channel *channel;
679
680 channel = &bpmp->threaded_channels[i];
681
682 if (tegra_bpmp_is_response_ready(channel)) {
683 tegra_bpmp_channel_signal(channel);
684 clear_bit(i, busy);
685 }
686 }
687
688 spin_unlock(&bpmp->lock);
689 }
690
tegra_bpmp_probe(struct platform_device * pdev)691 static int tegra_bpmp_probe(struct platform_device *pdev)
692 {
693 struct tegra_bpmp *bpmp;
694 char tag[TAG_SZ];
695 size_t size;
696 int err;
697
698 bpmp = devm_kzalloc(&pdev->dev, sizeof(*bpmp), GFP_KERNEL);
699 if (!bpmp)
700 return -ENOMEM;
701
702 bpmp->soc = of_device_get_match_data(&pdev->dev);
703 bpmp->dev = &pdev->dev;
704
705 INIT_LIST_HEAD(&bpmp->mrqs);
706 spin_lock_init(&bpmp->lock);
707
708 bpmp->threaded.count = bpmp->soc->channels.thread.count;
709 sema_init(&bpmp->threaded.lock, bpmp->threaded.count);
710
711 size = BITS_TO_LONGS(bpmp->threaded.count) * sizeof(long);
712
713 bpmp->threaded.allocated = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
714 if (!bpmp->threaded.allocated)
715 return -ENOMEM;
716
717 bpmp->threaded.busy = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
718 if (!bpmp->threaded.busy)
719 return -ENOMEM;
720
721 spin_lock_init(&bpmp->atomic_tx_lock);
722 bpmp->tx_channel = devm_kzalloc(&pdev->dev, sizeof(*bpmp->tx_channel),
723 GFP_KERNEL);
724 if (!bpmp->tx_channel)
725 return -ENOMEM;
726
727 bpmp->rx_channel = devm_kzalloc(&pdev->dev, sizeof(*bpmp->rx_channel),
728 GFP_KERNEL);
729 if (!bpmp->rx_channel)
730 return -ENOMEM;
731
732 bpmp->threaded_channels = devm_kcalloc(&pdev->dev, bpmp->threaded.count,
733 sizeof(*bpmp->threaded_channels),
734 GFP_KERNEL);
735 if (!bpmp->threaded_channels)
736 return -ENOMEM;
737
738 err = bpmp->soc->ops->init(bpmp);
739 if (err < 0)
740 return err;
741
742 err = tegra_bpmp_request_mrq(bpmp, MRQ_PING,
743 tegra_bpmp_mrq_handle_ping, bpmp);
744 if (err < 0)
745 goto deinit;
746
747 err = tegra_bpmp_ping(bpmp);
748 if (err < 0) {
749 dev_err(&pdev->dev, "failed to ping BPMP: %d\n", err);
750 goto free_mrq;
751 }
752
753 err = tegra_bpmp_get_firmware_tag(bpmp, tag, sizeof(tag));
754 if (err < 0) {
755 dev_err(&pdev->dev, "failed to get firmware tag: %d\n", err);
756 goto free_mrq;
757 }
758
759 dev_info(&pdev->dev, "firmware: %.*s\n", (int)sizeof(tag), tag);
760
761 platform_set_drvdata(pdev, bpmp);
762
763 err = of_platform_default_populate(pdev->dev.of_node, NULL, &pdev->dev);
764 if (err < 0)
765 goto free_mrq;
766
767 if (of_find_property(pdev->dev.of_node, "#clock-cells", NULL)) {
768 err = tegra_bpmp_init_clocks(bpmp);
769 if (err < 0)
770 goto free_mrq;
771 }
772
773 if (of_find_property(pdev->dev.of_node, "#reset-cells", NULL)) {
774 err = tegra_bpmp_init_resets(bpmp);
775 if (err < 0)
776 goto free_mrq;
777 }
778
779 if (of_find_property(pdev->dev.of_node, "#power-domain-cells", NULL)) {
780 err = tegra_bpmp_init_powergates(bpmp);
781 if (err < 0)
782 goto free_mrq;
783 }
784
785 err = tegra_bpmp_init_debugfs(bpmp);
786 if (err < 0)
787 dev_err(&pdev->dev, "debugfs initialization failed: %d\n", err);
788
789 return 0;
790
791 free_mrq:
792 tegra_bpmp_free_mrq(bpmp, MRQ_PING, bpmp);
793 deinit:
794 if (bpmp->soc->ops->deinit)
795 bpmp->soc->ops->deinit(bpmp);
796
797 return err;
798 }
799
tegra_bpmp_resume(struct device * dev)800 static int __maybe_unused tegra_bpmp_resume(struct device *dev)
801 {
802 struct tegra_bpmp *bpmp = dev_get_drvdata(dev);
803
804 if (bpmp->soc->ops->resume)
805 return bpmp->soc->ops->resume(bpmp);
806 else
807 return 0;
808 }
809
810 static const struct dev_pm_ops tegra_bpmp_pm_ops = {
811 .resume_noirq = tegra_bpmp_resume,
812 };
813
814 #if IS_ENABLED(CONFIG_ARCH_TEGRA_186_SOC) || \
815 IS_ENABLED(CONFIG_ARCH_TEGRA_194_SOC) || \
816 IS_ENABLED(CONFIG_ARCH_TEGRA_234_SOC)
817 static const struct tegra_bpmp_soc tegra186_soc = {
818 .channels = {
819 .cpu_tx = {
820 .offset = 3,
821 .timeout = 60 * USEC_PER_SEC,
822 },
823 .thread = {
824 .offset = 0,
825 .count = 3,
826 .timeout = 600 * USEC_PER_SEC,
827 },
828 .cpu_rx = {
829 .offset = 13,
830 .timeout = 0,
831 },
832 },
833 .ops = &tegra186_bpmp_ops,
834 .num_resets = 193,
835 };
836 #endif
837
838 #if IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC)
839 static const struct tegra_bpmp_soc tegra210_soc = {
840 .channels = {
841 .cpu_tx = {
842 .offset = 0,
843 .count = 1,
844 .timeout = 60 * USEC_PER_SEC,
845 },
846 .thread = {
847 .offset = 4,
848 .count = 1,
849 .timeout = 600 * USEC_PER_SEC,
850 },
851 .cpu_rx = {
852 .offset = 8,
853 .count = 1,
854 .timeout = 0,
855 },
856 },
857 .ops = &tegra210_bpmp_ops,
858 };
859 #endif
860
861 static const struct of_device_id tegra_bpmp_match[] = {
862 #if IS_ENABLED(CONFIG_ARCH_TEGRA_186_SOC) || \
863 IS_ENABLED(CONFIG_ARCH_TEGRA_194_SOC) || \
864 IS_ENABLED(CONFIG_ARCH_TEGRA_234_SOC)
865 { .compatible = "nvidia,tegra186-bpmp", .data = &tegra186_soc },
866 #endif
867 #if IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC)
868 { .compatible = "nvidia,tegra210-bpmp", .data = &tegra210_soc },
869 #endif
870 { }
871 };
872
873 static struct platform_driver tegra_bpmp_driver = {
874 .driver = {
875 .name = "tegra-bpmp",
876 .of_match_table = tegra_bpmp_match,
877 .pm = &tegra_bpmp_pm_ops,
878 .suppress_bind_attrs = true,
879 },
880 .probe = tegra_bpmp_probe,
881 };
882 builtin_platform_driver(tegra_bpmp_driver);
883