rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms and conditions of the GNU General Public License, |
| 6 | * version 2, as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/clk/tegra.h> |
| 15 | #include <linux/genalloc.h> |
| 16 | #include <linux/mailbox_client.h> |
| 17 | #include <linux/of.h> |
| 18 | #include <linux/of_address.h> |
| 19 | #include <linux/of_device.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/semaphore.h> |
| 22 | #include <linux/sched/clock.h> |
| 23 | |
| 24 | #include <soc/tegra/bpmp.h> |
| 25 | #include <soc/tegra/bpmp-abi.h> |
| 26 | #include <soc/tegra/ivc.h> |
| 27 | |
| 28 | #define MSG_ACK BIT(0) |
| 29 | #define MSG_RING BIT(1) |
| 30 | |
| 31 | static inline struct tegra_bpmp * |
| 32 | mbox_client_to_bpmp(struct mbox_client *client) |
| 33 | { |
| 34 | return container_of(client, struct tegra_bpmp, mbox.client); |
| 35 | } |
| 36 | |
| 37 | struct tegra_bpmp *tegra_bpmp_get(struct device *dev) |
| 38 | { |
| 39 | struct platform_device *pdev; |
| 40 | struct tegra_bpmp *bpmp; |
| 41 | struct device_node *np; |
| 42 | |
| 43 | np = of_parse_phandle(dev->of_node, "nvidia,bpmp", 0); |
| 44 | if (!np) |
| 45 | return ERR_PTR(-ENOENT); |
| 46 | |
| 47 | pdev = of_find_device_by_node(np); |
| 48 | if (!pdev) { |
| 49 | bpmp = ERR_PTR(-ENODEV); |
| 50 | goto put; |
| 51 | } |
| 52 | |
| 53 | bpmp = platform_get_drvdata(pdev); |
| 54 | if (!bpmp) { |
| 55 | bpmp = ERR_PTR(-EPROBE_DEFER); |
| 56 | put_device(&pdev->dev); |
| 57 | goto put; |
| 58 | } |
| 59 | |
| 60 | put: |
| 61 | of_node_put(np); |
| 62 | return bpmp; |
| 63 | } |
| 64 | EXPORT_SYMBOL_GPL(tegra_bpmp_get); |
| 65 | |
| 66 | void tegra_bpmp_put(struct tegra_bpmp *bpmp) |
| 67 | { |
| 68 | if (bpmp) |
| 69 | put_device(bpmp->dev); |
| 70 | } |
| 71 | EXPORT_SYMBOL_GPL(tegra_bpmp_put); |
| 72 | |
| 73 | static int tegra_bpmp_channel_get_index(struct tegra_bpmp_channel *channel) |
| 74 | { |
| 75 | return channel - channel->bpmp->channels; |
| 76 | } |
| 77 | |
| 78 | static int |
| 79 | tegra_bpmp_channel_get_thread_index(struct tegra_bpmp_channel *channel) |
| 80 | { |
| 81 | struct tegra_bpmp *bpmp = channel->bpmp; |
| 82 | unsigned int offset, count; |
| 83 | int index; |
| 84 | |
| 85 | offset = bpmp->soc->channels.thread.offset; |
| 86 | count = bpmp->soc->channels.thread.count; |
| 87 | |
| 88 | index = tegra_bpmp_channel_get_index(channel); |
| 89 | if (index < 0) |
| 90 | return index; |
| 91 | |
| 92 | if (index < offset || index >= offset + count) |
| 93 | return -EINVAL; |
| 94 | |
| 95 | return index - offset; |
| 96 | } |
| 97 | |
| 98 | static struct tegra_bpmp_channel * |
| 99 | tegra_bpmp_channel_get_thread(struct tegra_bpmp *bpmp, unsigned int index) |
| 100 | { |
| 101 | unsigned int offset = bpmp->soc->channels.thread.offset; |
| 102 | unsigned int count = bpmp->soc->channels.thread.count; |
| 103 | |
| 104 | if (index >= count) |
| 105 | return NULL; |
| 106 | |
| 107 | return &bpmp->channels[offset + index]; |
| 108 | } |
| 109 | |
| 110 | static struct tegra_bpmp_channel * |
| 111 | tegra_bpmp_channel_get_tx(struct tegra_bpmp *bpmp) |
| 112 | { |
| 113 | unsigned int offset = bpmp->soc->channels.cpu_tx.offset; |
| 114 | |
| 115 | return &bpmp->channels[offset + smp_processor_id()]; |
| 116 | } |
| 117 | |
| 118 | static struct tegra_bpmp_channel * |
| 119 | tegra_bpmp_channel_get_rx(struct tegra_bpmp *bpmp) |
| 120 | { |
| 121 | unsigned int offset = bpmp->soc->channels.cpu_rx.offset; |
| 122 | |
| 123 | return &bpmp->channels[offset]; |
| 124 | } |
| 125 | |
| 126 | static bool tegra_bpmp_message_valid(const struct tegra_bpmp_message *msg) |
| 127 | { |
| 128 | return (msg->tx.size <= MSG_DATA_MIN_SZ) && |
| 129 | (msg->rx.size <= MSG_DATA_MIN_SZ) && |
| 130 | (msg->tx.size == 0 || msg->tx.data) && |
| 131 | (msg->rx.size == 0 || msg->rx.data); |
| 132 | } |
| 133 | |
| 134 | static bool tegra_bpmp_master_acked(struct tegra_bpmp_channel *channel) |
| 135 | { |
| 136 | void *frame; |
| 137 | |
| 138 | frame = tegra_ivc_read_get_next_frame(channel->ivc); |
| 139 | if (IS_ERR(frame)) { |
| 140 | channel->ib = NULL; |
| 141 | return false; |
| 142 | } |
| 143 | |
| 144 | channel->ib = frame; |
| 145 | |
| 146 | return true; |
| 147 | } |
| 148 | |
| 149 | static int tegra_bpmp_wait_ack(struct tegra_bpmp_channel *channel) |
| 150 | { |
| 151 | unsigned long timeout = channel->bpmp->soc->channels.cpu_tx.timeout; |
| 152 | ktime_t end; |
| 153 | |
| 154 | end = ktime_add_us(ktime_get(), timeout); |
| 155 | |
| 156 | do { |
| 157 | if (tegra_bpmp_master_acked(channel)) |
| 158 | return 0; |
| 159 | } while (ktime_before(ktime_get(), end)); |
| 160 | |
| 161 | return -ETIMEDOUT; |
| 162 | } |
| 163 | |
| 164 | static bool tegra_bpmp_master_free(struct tegra_bpmp_channel *channel) |
| 165 | { |
| 166 | void *frame; |
| 167 | |
| 168 | frame = tegra_ivc_write_get_next_frame(channel->ivc); |
| 169 | if (IS_ERR(frame)) { |
| 170 | channel->ob = NULL; |
| 171 | return false; |
| 172 | } |
| 173 | |
| 174 | channel->ob = frame; |
| 175 | |
| 176 | return true; |
| 177 | } |
| 178 | |
| 179 | static int tegra_bpmp_wait_master_free(struct tegra_bpmp_channel *channel) |
| 180 | { |
| 181 | unsigned long timeout = channel->bpmp->soc->channels.cpu_tx.timeout; |
| 182 | ktime_t start, now; |
| 183 | |
| 184 | start = ns_to_ktime(local_clock()); |
| 185 | |
| 186 | do { |
| 187 | if (tegra_bpmp_master_free(channel)) |
| 188 | return 0; |
| 189 | |
| 190 | now = ns_to_ktime(local_clock()); |
| 191 | } while (ktime_us_delta(now, start) < timeout); |
| 192 | |
| 193 | return -ETIMEDOUT; |
| 194 | } |
| 195 | |
| 196 | static ssize_t __tegra_bpmp_channel_read(struct tegra_bpmp_channel *channel, |
| 197 | void *data, size_t size) |
| 198 | { |
| 199 | if (data && size > 0) |
| 200 | memcpy(data, channel->ib->data, size); |
| 201 | |
| 202 | return tegra_ivc_read_advance(channel->ivc); |
| 203 | } |
| 204 | |
| 205 | static ssize_t tegra_bpmp_channel_read(struct tegra_bpmp_channel *channel, |
| 206 | void *data, size_t size) |
| 207 | { |
| 208 | struct tegra_bpmp *bpmp = channel->bpmp; |
| 209 | unsigned long flags; |
| 210 | ssize_t err; |
| 211 | int index; |
| 212 | |
| 213 | index = tegra_bpmp_channel_get_thread_index(channel); |
| 214 | if (index < 0) { |
| 215 | err = index; |
| 216 | goto unlock; |
| 217 | } |
| 218 | |
| 219 | spin_lock_irqsave(&bpmp->lock, flags); |
| 220 | err = __tegra_bpmp_channel_read(channel, data, size); |
| 221 | clear_bit(index, bpmp->threaded.allocated); |
| 222 | spin_unlock_irqrestore(&bpmp->lock, flags); |
| 223 | |
| 224 | unlock: |
| 225 | up(&bpmp->threaded.lock); |
| 226 | |
| 227 | return err; |
| 228 | } |
| 229 | |
| 230 | static ssize_t __tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel, |
| 231 | unsigned int mrq, unsigned long flags, |
| 232 | const void *data, size_t size) |
| 233 | { |
| 234 | channel->ob->code = mrq; |
| 235 | channel->ob->flags = flags; |
| 236 | |
| 237 | if (data && size > 0) |
| 238 | memcpy(channel->ob->data, data, size); |
| 239 | |
| 240 | return tegra_ivc_write_advance(channel->ivc); |
| 241 | } |
| 242 | |
| 243 | static struct tegra_bpmp_channel * |
| 244 | tegra_bpmp_write_threaded(struct tegra_bpmp *bpmp, unsigned int mrq, |
| 245 | const void *data, size_t size) |
| 246 | { |
| 247 | unsigned long timeout = bpmp->soc->channels.thread.timeout; |
| 248 | unsigned int count = bpmp->soc->channels.thread.count; |
| 249 | struct tegra_bpmp_channel *channel; |
| 250 | unsigned long flags; |
| 251 | unsigned int index; |
| 252 | int err; |
| 253 | |
| 254 | err = down_timeout(&bpmp->threaded.lock, usecs_to_jiffies(timeout)); |
| 255 | if (err < 0) |
| 256 | return ERR_PTR(err); |
| 257 | |
| 258 | spin_lock_irqsave(&bpmp->lock, flags); |
| 259 | |
| 260 | index = find_first_zero_bit(bpmp->threaded.allocated, count); |
| 261 | if (index == count) { |
| 262 | err = -EBUSY; |
| 263 | goto unlock; |
| 264 | } |
| 265 | |
| 266 | channel = tegra_bpmp_channel_get_thread(bpmp, index); |
| 267 | if (!channel) { |
| 268 | err = -EINVAL; |
| 269 | goto unlock; |
| 270 | } |
| 271 | |
| 272 | if (!tegra_bpmp_master_free(channel)) { |
| 273 | err = -EBUSY; |
| 274 | goto unlock; |
| 275 | } |
| 276 | |
| 277 | set_bit(index, bpmp->threaded.allocated); |
| 278 | |
| 279 | err = __tegra_bpmp_channel_write(channel, mrq, MSG_ACK | MSG_RING, |
| 280 | data, size); |
| 281 | if (err < 0) |
| 282 | goto clear_allocated; |
| 283 | |
| 284 | set_bit(index, bpmp->threaded.busy); |
| 285 | |
| 286 | spin_unlock_irqrestore(&bpmp->lock, flags); |
| 287 | return channel; |
| 288 | |
| 289 | clear_allocated: |
| 290 | clear_bit(index, bpmp->threaded.allocated); |
| 291 | unlock: |
| 292 | spin_unlock_irqrestore(&bpmp->lock, flags); |
| 293 | up(&bpmp->threaded.lock); |
| 294 | |
| 295 | return ERR_PTR(err); |
| 296 | } |
| 297 | |
| 298 | static ssize_t tegra_bpmp_channel_write(struct tegra_bpmp_channel *channel, |
| 299 | unsigned int mrq, unsigned long flags, |
| 300 | const void *data, size_t size) |
| 301 | { |
| 302 | int err; |
| 303 | |
| 304 | err = tegra_bpmp_wait_master_free(channel); |
| 305 | if (err < 0) |
| 306 | return err; |
| 307 | |
| 308 | return __tegra_bpmp_channel_write(channel, mrq, flags, data, size); |
| 309 | } |
| 310 | |
| 311 | int tegra_bpmp_transfer_atomic(struct tegra_bpmp *bpmp, |
| 312 | struct tegra_bpmp_message *msg) |
| 313 | { |
| 314 | struct tegra_bpmp_channel *channel; |
| 315 | int err; |
| 316 | |
| 317 | if (WARN_ON(!irqs_disabled())) |
| 318 | return -EPERM; |
| 319 | |
| 320 | if (!tegra_bpmp_message_valid(msg)) |
| 321 | return -EINVAL; |
| 322 | |
| 323 | channel = tegra_bpmp_channel_get_tx(bpmp); |
| 324 | |
| 325 | err = tegra_bpmp_channel_write(channel, msg->mrq, MSG_ACK, |
| 326 | msg->tx.data, msg->tx.size); |
| 327 | if (err < 0) |
| 328 | return err; |
| 329 | |
| 330 | err = mbox_send_message(bpmp->mbox.channel, NULL); |
| 331 | if (err < 0) |
| 332 | return err; |
| 333 | |
| 334 | mbox_client_txdone(bpmp->mbox.channel, 0); |
| 335 | |
| 336 | err = tegra_bpmp_wait_ack(channel); |
| 337 | if (err < 0) |
| 338 | return err; |
| 339 | |
| 340 | return __tegra_bpmp_channel_read(channel, msg->rx.data, msg->rx.size); |
| 341 | } |
| 342 | EXPORT_SYMBOL_GPL(tegra_bpmp_transfer_atomic); |
| 343 | |
| 344 | int tegra_bpmp_transfer(struct tegra_bpmp *bpmp, |
| 345 | struct tegra_bpmp_message *msg) |
| 346 | { |
| 347 | struct tegra_bpmp_channel *channel; |
| 348 | unsigned long timeout; |
| 349 | int err; |
| 350 | |
| 351 | if (WARN_ON(irqs_disabled())) |
| 352 | return -EPERM; |
| 353 | |
| 354 | if (!tegra_bpmp_message_valid(msg)) |
| 355 | return -EINVAL; |
| 356 | |
| 357 | channel = tegra_bpmp_write_threaded(bpmp, msg->mrq, msg->tx.data, |
| 358 | msg->tx.size); |
| 359 | if (IS_ERR(channel)) |
| 360 | return PTR_ERR(channel); |
| 361 | |
| 362 | err = mbox_send_message(bpmp->mbox.channel, NULL); |
| 363 | if (err < 0) |
| 364 | return err; |
| 365 | |
| 366 | mbox_client_txdone(bpmp->mbox.channel, 0); |
| 367 | |
| 368 | timeout = usecs_to_jiffies(bpmp->soc->channels.thread.timeout); |
| 369 | |
| 370 | err = wait_for_completion_timeout(&channel->completion, timeout); |
| 371 | if (err == 0) |
| 372 | return -ETIMEDOUT; |
| 373 | |
| 374 | return tegra_bpmp_channel_read(channel, msg->rx.data, msg->rx.size); |
| 375 | } |
| 376 | EXPORT_SYMBOL_GPL(tegra_bpmp_transfer); |
| 377 | |
| 378 | static struct tegra_bpmp_mrq *tegra_bpmp_find_mrq(struct tegra_bpmp *bpmp, |
| 379 | unsigned int mrq) |
| 380 | { |
| 381 | struct tegra_bpmp_mrq *entry; |
| 382 | |
| 383 | list_for_each_entry(entry, &bpmp->mrqs, list) |
| 384 | if (entry->mrq == mrq) |
| 385 | return entry; |
| 386 | |
| 387 | return NULL; |
| 388 | } |
| 389 | |
| 390 | static void tegra_bpmp_mrq_return(struct tegra_bpmp_channel *channel, |
| 391 | int code, const void *data, size_t size) |
| 392 | { |
| 393 | unsigned long flags = channel->ib->flags; |
| 394 | struct tegra_bpmp *bpmp = channel->bpmp; |
| 395 | struct tegra_bpmp_mb_data *frame; |
| 396 | int err; |
| 397 | |
| 398 | if (WARN_ON(size > MSG_DATA_MIN_SZ)) |
| 399 | return; |
| 400 | |
| 401 | err = tegra_ivc_read_advance(channel->ivc); |
| 402 | if (WARN_ON(err < 0)) |
| 403 | return; |
| 404 | |
| 405 | if ((flags & MSG_ACK) == 0) |
| 406 | return; |
| 407 | |
| 408 | frame = tegra_ivc_write_get_next_frame(channel->ivc); |
| 409 | if (WARN_ON(IS_ERR(frame))) |
| 410 | return; |
| 411 | |
| 412 | frame->code = code; |
| 413 | |
| 414 | if (data && size > 0) |
| 415 | memcpy(frame->data, data, size); |
| 416 | |
| 417 | err = tegra_ivc_write_advance(channel->ivc); |
| 418 | if (WARN_ON(err < 0)) |
| 419 | return; |
| 420 | |
| 421 | if (flags & MSG_RING) { |
| 422 | err = mbox_send_message(bpmp->mbox.channel, NULL); |
| 423 | if (WARN_ON(err < 0)) |
| 424 | return; |
| 425 | |
| 426 | mbox_client_txdone(bpmp->mbox.channel, 0); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | static void tegra_bpmp_handle_mrq(struct tegra_bpmp *bpmp, |
| 431 | unsigned int mrq, |
| 432 | struct tegra_bpmp_channel *channel) |
| 433 | { |
| 434 | struct tegra_bpmp_mrq *entry; |
| 435 | u32 zero = 0; |
| 436 | |
| 437 | spin_lock(&bpmp->lock); |
| 438 | |
| 439 | entry = tegra_bpmp_find_mrq(bpmp, mrq); |
| 440 | if (!entry) { |
| 441 | spin_unlock(&bpmp->lock); |
| 442 | tegra_bpmp_mrq_return(channel, -EINVAL, &zero, sizeof(zero)); |
| 443 | return; |
| 444 | } |
| 445 | |
| 446 | entry->handler(mrq, channel, entry->data); |
| 447 | |
| 448 | spin_unlock(&bpmp->lock); |
| 449 | } |
| 450 | |
| 451 | int tegra_bpmp_request_mrq(struct tegra_bpmp *bpmp, unsigned int mrq, |
| 452 | tegra_bpmp_mrq_handler_t handler, void *data) |
| 453 | { |
| 454 | struct tegra_bpmp_mrq *entry; |
| 455 | unsigned long flags; |
| 456 | |
| 457 | if (!handler) |
| 458 | return -EINVAL; |
| 459 | |
| 460 | entry = devm_kzalloc(bpmp->dev, sizeof(*entry), GFP_KERNEL); |
| 461 | if (!entry) |
| 462 | return -ENOMEM; |
| 463 | |
| 464 | spin_lock_irqsave(&bpmp->lock, flags); |
| 465 | |
| 466 | entry->mrq = mrq; |
| 467 | entry->handler = handler; |
| 468 | entry->data = data; |
| 469 | list_add(&entry->list, &bpmp->mrqs); |
| 470 | |
| 471 | spin_unlock_irqrestore(&bpmp->lock, flags); |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | EXPORT_SYMBOL_GPL(tegra_bpmp_request_mrq); |
| 476 | |
| 477 | void tegra_bpmp_free_mrq(struct tegra_bpmp *bpmp, unsigned int mrq, void *data) |
| 478 | { |
| 479 | struct tegra_bpmp_mrq *entry; |
| 480 | unsigned long flags; |
| 481 | |
| 482 | spin_lock_irqsave(&bpmp->lock, flags); |
| 483 | |
| 484 | entry = tegra_bpmp_find_mrq(bpmp, mrq); |
| 485 | if (!entry) |
| 486 | goto unlock; |
| 487 | |
| 488 | list_del(&entry->list); |
| 489 | devm_kfree(bpmp->dev, entry); |
| 490 | |
| 491 | unlock: |
| 492 | spin_unlock_irqrestore(&bpmp->lock, flags); |
| 493 | } |
| 494 | EXPORT_SYMBOL_GPL(tegra_bpmp_free_mrq); |
| 495 | |
| 496 | static void tegra_bpmp_mrq_handle_ping(unsigned int mrq, |
| 497 | struct tegra_bpmp_channel *channel, |
| 498 | void *data) |
| 499 | { |
| 500 | struct mrq_ping_request *request; |
| 501 | struct mrq_ping_response response; |
| 502 | |
| 503 | request = (struct mrq_ping_request *)channel->ib->data; |
| 504 | |
| 505 | memset(&response, 0, sizeof(response)); |
| 506 | response.reply = request->challenge << 1; |
| 507 | |
| 508 | tegra_bpmp_mrq_return(channel, 0, &response, sizeof(response)); |
| 509 | } |
| 510 | |
| 511 | static int tegra_bpmp_ping(struct tegra_bpmp *bpmp) |
| 512 | { |
| 513 | struct mrq_ping_response response; |
| 514 | struct mrq_ping_request request; |
| 515 | struct tegra_bpmp_message msg; |
| 516 | unsigned long flags; |
| 517 | ktime_t start, end; |
| 518 | int err; |
| 519 | |
| 520 | memset(&request, 0, sizeof(request)); |
| 521 | request.challenge = 1; |
| 522 | |
| 523 | memset(&response, 0, sizeof(response)); |
| 524 | |
| 525 | memset(&msg, 0, sizeof(msg)); |
| 526 | msg.mrq = MRQ_PING; |
| 527 | msg.tx.data = &request; |
| 528 | msg.tx.size = sizeof(request); |
| 529 | msg.rx.data = &response; |
| 530 | msg.rx.size = sizeof(response); |
| 531 | |
| 532 | local_irq_save(flags); |
| 533 | start = ktime_get(); |
| 534 | err = tegra_bpmp_transfer_atomic(bpmp, &msg); |
| 535 | end = ktime_get(); |
| 536 | local_irq_restore(flags); |
| 537 | |
| 538 | if (!err) |
| 539 | dev_dbg(bpmp->dev, |
| 540 | "ping ok: challenge: %u, response: %u, time: %lld\n", |
| 541 | request.challenge, response.reply, |
| 542 | ktime_to_us(ktime_sub(end, start))); |
| 543 | |
| 544 | return err; |
| 545 | } |
| 546 | |
| 547 | static int tegra_bpmp_get_firmware_tag(struct tegra_bpmp *bpmp, char *tag, |
| 548 | size_t size) |
| 549 | { |
| 550 | struct mrq_query_tag_request request; |
| 551 | struct tegra_bpmp_message msg; |
| 552 | unsigned long flags; |
| 553 | dma_addr_t phys; |
| 554 | void *virt; |
| 555 | int err; |
| 556 | |
| 557 | virt = dma_alloc_coherent(bpmp->dev, MSG_DATA_MIN_SZ, &phys, |
| 558 | GFP_KERNEL | GFP_DMA32); |
| 559 | if (!virt) |
| 560 | return -ENOMEM; |
| 561 | |
| 562 | memset(&request, 0, sizeof(request)); |
| 563 | request.addr = phys; |
| 564 | |
| 565 | memset(&msg, 0, sizeof(msg)); |
| 566 | msg.mrq = MRQ_QUERY_TAG; |
| 567 | msg.tx.data = &request; |
| 568 | msg.tx.size = sizeof(request); |
| 569 | |
| 570 | local_irq_save(flags); |
| 571 | err = tegra_bpmp_transfer_atomic(bpmp, &msg); |
| 572 | local_irq_restore(flags); |
| 573 | |
| 574 | if (err == 0) |
| 575 | strlcpy(tag, virt, size); |
| 576 | |
| 577 | dma_free_coherent(bpmp->dev, MSG_DATA_MIN_SZ, virt, phys); |
| 578 | |
| 579 | return err; |
| 580 | } |
| 581 | |
| 582 | static void tegra_bpmp_channel_signal(struct tegra_bpmp_channel *channel) |
| 583 | { |
| 584 | unsigned long flags = channel->ob->flags; |
| 585 | |
| 586 | if ((flags & MSG_RING) == 0) |
| 587 | return; |
| 588 | |
| 589 | complete(&channel->completion); |
| 590 | } |
| 591 | |
| 592 | static void tegra_bpmp_handle_rx(struct mbox_client *client, void *data) |
| 593 | { |
| 594 | struct tegra_bpmp *bpmp = mbox_client_to_bpmp(client); |
| 595 | struct tegra_bpmp_channel *channel; |
| 596 | unsigned int i, count; |
| 597 | unsigned long *busy; |
| 598 | |
| 599 | channel = tegra_bpmp_channel_get_rx(bpmp); |
| 600 | count = bpmp->soc->channels.thread.count; |
| 601 | busy = bpmp->threaded.busy; |
| 602 | |
| 603 | if (tegra_bpmp_master_acked(channel)) |
| 604 | tegra_bpmp_handle_mrq(bpmp, channel->ib->code, channel); |
| 605 | |
| 606 | spin_lock(&bpmp->lock); |
| 607 | |
| 608 | for_each_set_bit(i, busy, count) { |
| 609 | struct tegra_bpmp_channel *channel; |
| 610 | |
| 611 | channel = tegra_bpmp_channel_get_thread(bpmp, i); |
| 612 | if (!channel) |
| 613 | continue; |
| 614 | |
| 615 | if (tegra_bpmp_master_acked(channel)) { |
| 616 | tegra_bpmp_channel_signal(channel); |
| 617 | clear_bit(i, busy); |
| 618 | } |
| 619 | } |
| 620 | |
| 621 | spin_unlock(&bpmp->lock); |
| 622 | } |
| 623 | |
| 624 | static void tegra_bpmp_ivc_notify(struct tegra_ivc *ivc, void *data) |
| 625 | { |
| 626 | struct tegra_bpmp *bpmp = data; |
| 627 | int err; |
| 628 | |
| 629 | if (WARN_ON(bpmp->mbox.channel == NULL)) |
| 630 | return; |
| 631 | |
| 632 | err = mbox_send_message(bpmp->mbox.channel, NULL); |
| 633 | if (err < 0) |
| 634 | return; |
| 635 | |
| 636 | mbox_client_txdone(bpmp->mbox.channel, 0); |
| 637 | } |
| 638 | |
| 639 | static int tegra_bpmp_channel_init(struct tegra_bpmp_channel *channel, |
| 640 | struct tegra_bpmp *bpmp, |
| 641 | unsigned int index) |
| 642 | { |
| 643 | size_t message_size, queue_size; |
| 644 | unsigned int offset; |
| 645 | int err; |
| 646 | |
| 647 | channel->ivc = devm_kzalloc(bpmp->dev, sizeof(*channel->ivc), |
| 648 | GFP_KERNEL); |
| 649 | if (!channel->ivc) |
| 650 | return -ENOMEM; |
| 651 | |
| 652 | message_size = tegra_ivc_align(MSG_MIN_SZ); |
| 653 | queue_size = tegra_ivc_total_queue_size(message_size); |
| 654 | offset = queue_size * index; |
| 655 | |
| 656 | err = tegra_ivc_init(channel->ivc, NULL, |
| 657 | bpmp->rx.virt + offset, bpmp->rx.phys + offset, |
| 658 | bpmp->tx.virt + offset, bpmp->tx.phys + offset, |
| 659 | 1, message_size, tegra_bpmp_ivc_notify, |
| 660 | bpmp); |
| 661 | if (err < 0) { |
| 662 | dev_err(bpmp->dev, "failed to setup IVC for channel %u: %d\n", |
| 663 | index, err); |
| 664 | return err; |
| 665 | } |
| 666 | |
| 667 | init_completion(&channel->completion); |
| 668 | channel->bpmp = bpmp; |
| 669 | |
| 670 | return 0; |
| 671 | } |
| 672 | |
| 673 | static void tegra_bpmp_channel_reset(struct tegra_bpmp_channel *channel) |
| 674 | { |
| 675 | /* reset the channel state */ |
| 676 | tegra_ivc_reset(channel->ivc); |
| 677 | |
| 678 | /* sync the channel state with BPMP */ |
| 679 | while (tegra_ivc_notified(channel->ivc)) |
| 680 | ; |
| 681 | } |
| 682 | |
| 683 | static void tegra_bpmp_channel_cleanup(struct tegra_bpmp_channel *channel) |
| 684 | { |
| 685 | tegra_ivc_cleanup(channel->ivc); |
| 686 | } |
| 687 | |
| 688 | static int tegra_bpmp_probe(struct platform_device *pdev) |
| 689 | { |
| 690 | struct tegra_bpmp_channel *channel; |
| 691 | struct tegra_bpmp *bpmp; |
| 692 | unsigned int i; |
| 693 | char tag[32]; |
| 694 | size_t size; |
| 695 | int err; |
| 696 | |
| 697 | bpmp = devm_kzalloc(&pdev->dev, sizeof(*bpmp), GFP_KERNEL); |
| 698 | if (!bpmp) |
| 699 | return -ENOMEM; |
| 700 | |
| 701 | bpmp->soc = of_device_get_match_data(&pdev->dev); |
| 702 | bpmp->dev = &pdev->dev; |
| 703 | |
| 704 | bpmp->tx.pool = of_gen_pool_get(pdev->dev.of_node, "shmem", 0); |
| 705 | if (!bpmp->tx.pool) { |
| 706 | dev_err(&pdev->dev, "TX shmem pool not found\n"); |
| 707 | return -ENOMEM; |
| 708 | } |
| 709 | |
| 710 | bpmp->tx.virt = gen_pool_dma_alloc(bpmp->tx.pool, 4096, &bpmp->tx.phys); |
| 711 | if (!bpmp->tx.virt) { |
| 712 | dev_err(&pdev->dev, "failed to allocate from TX pool\n"); |
| 713 | return -ENOMEM; |
| 714 | } |
| 715 | |
| 716 | bpmp->rx.pool = of_gen_pool_get(pdev->dev.of_node, "shmem", 1); |
| 717 | if (!bpmp->rx.pool) { |
| 718 | dev_err(&pdev->dev, "RX shmem pool not found\n"); |
| 719 | err = -ENOMEM; |
| 720 | goto free_tx; |
| 721 | } |
| 722 | |
| 723 | bpmp->rx.virt = gen_pool_dma_alloc(bpmp->rx.pool, 4096, &bpmp->rx.phys); |
| 724 | if (!bpmp->rx.pool) { |
| 725 | dev_err(&pdev->dev, "failed to allocate from RX pool\n"); |
| 726 | err = -ENOMEM; |
| 727 | goto free_tx; |
| 728 | } |
| 729 | |
| 730 | INIT_LIST_HEAD(&bpmp->mrqs); |
| 731 | spin_lock_init(&bpmp->lock); |
| 732 | |
| 733 | bpmp->threaded.count = bpmp->soc->channels.thread.count; |
| 734 | sema_init(&bpmp->threaded.lock, bpmp->threaded.count); |
| 735 | |
| 736 | size = BITS_TO_LONGS(bpmp->threaded.count) * sizeof(long); |
| 737 | |
| 738 | bpmp->threaded.allocated = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); |
| 739 | if (!bpmp->threaded.allocated) { |
| 740 | err = -ENOMEM; |
| 741 | goto free_rx; |
| 742 | } |
| 743 | |
| 744 | bpmp->threaded.busy = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); |
| 745 | if (!bpmp->threaded.busy) { |
| 746 | err = -ENOMEM; |
| 747 | goto free_rx; |
| 748 | } |
| 749 | |
| 750 | bpmp->num_channels = bpmp->soc->channels.cpu_tx.count + |
| 751 | bpmp->soc->channels.thread.count + |
| 752 | bpmp->soc->channels.cpu_rx.count; |
| 753 | |
| 754 | bpmp->channels = devm_kcalloc(&pdev->dev, bpmp->num_channels, |
| 755 | sizeof(*channel), GFP_KERNEL); |
| 756 | if (!bpmp->channels) { |
| 757 | err = -ENOMEM; |
| 758 | goto free_rx; |
| 759 | } |
| 760 | |
| 761 | /* message channel initialization */ |
| 762 | for (i = 0; i < bpmp->num_channels; i++) { |
| 763 | struct tegra_bpmp_channel *channel = &bpmp->channels[i]; |
| 764 | |
| 765 | err = tegra_bpmp_channel_init(channel, bpmp, i); |
| 766 | if (err < 0) |
| 767 | goto cleanup_channels; |
| 768 | } |
| 769 | |
| 770 | /* mbox registration */ |
| 771 | bpmp->mbox.client.dev = &pdev->dev; |
| 772 | bpmp->mbox.client.rx_callback = tegra_bpmp_handle_rx; |
| 773 | bpmp->mbox.client.tx_block = false; |
| 774 | bpmp->mbox.client.knows_txdone = false; |
| 775 | |
| 776 | bpmp->mbox.channel = mbox_request_channel(&bpmp->mbox.client, 0); |
| 777 | if (IS_ERR(bpmp->mbox.channel)) { |
| 778 | err = PTR_ERR(bpmp->mbox.channel); |
| 779 | dev_err(&pdev->dev, "failed to get HSP mailbox: %d\n", err); |
| 780 | goto cleanup_channels; |
| 781 | } |
| 782 | |
| 783 | /* reset message channels */ |
| 784 | for (i = 0; i < bpmp->num_channels; i++) { |
| 785 | struct tegra_bpmp_channel *channel = &bpmp->channels[i]; |
| 786 | |
| 787 | tegra_bpmp_channel_reset(channel); |
| 788 | } |
| 789 | |
| 790 | err = tegra_bpmp_request_mrq(bpmp, MRQ_PING, |
| 791 | tegra_bpmp_mrq_handle_ping, bpmp); |
| 792 | if (err < 0) |
| 793 | goto free_mbox; |
| 794 | |
| 795 | err = tegra_bpmp_ping(bpmp); |
| 796 | if (err < 0) { |
| 797 | dev_err(&pdev->dev, "failed to ping BPMP: %d\n", err); |
| 798 | goto free_mrq; |
| 799 | } |
| 800 | |
| 801 | err = tegra_bpmp_get_firmware_tag(bpmp, tag, sizeof(tag) - 1); |
| 802 | if (err < 0) { |
| 803 | dev_err(&pdev->dev, "failed to get firmware tag: %d\n", err); |
| 804 | goto free_mrq; |
| 805 | } |
| 806 | |
| 807 | dev_info(&pdev->dev, "firmware: %s\n", tag); |
| 808 | |
| 809 | platform_set_drvdata(pdev, bpmp); |
| 810 | |
| 811 | err = of_platform_default_populate(pdev->dev.of_node, NULL, &pdev->dev); |
| 812 | if (err < 0) |
| 813 | goto free_mrq; |
| 814 | |
| 815 | err = tegra_bpmp_init_clocks(bpmp); |
| 816 | if (err < 0) |
| 817 | goto free_mrq; |
| 818 | |
| 819 | err = tegra_bpmp_init_resets(bpmp); |
| 820 | if (err < 0) |
| 821 | goto free_mrq; |
| 822 | |
| 823 | err = tegra_bpmp_init_powergates(bpmp); |
| 824 | if (err < 0) |
| 825 | goto free_mrq; |
| 826 | |
| 827 | return 0; |
| 828 | |
| 829 | free_mrq: |
| 830 | tegra_bpmp_free_mrq(bpmp, MRQ_PING, bpmp); |
| 831 | free_mbox: |
| 832 | mbox_free_channel(bpmp->mbox.channel); |
| 833 | cleanup_channels: |
| 834 | while (i--) |
| 835 | tegra_bpmp_channel_cleanup(&bpmp->channels[i]); |
| 836 | free_rx: |
| 837 | gen_pool_free(bpmp->rx.pool, (unsigned long)bpmp->rx.virt, 4096); |
| 838 | free_tx: |
| 839 | gen_pool_free(bpmp->tx.pool, (unsigned long)bpmp->tx.virt, 4096); |
| 840 | return err; |
| 841 | } |
| 842 | |
| 843 | static const struct tegra_bpmp_soc tegra186_soc = { |
| 844 | .channels = { |
| 845 | .cpu_tx = { |
| 846 | .offset = 0, |
| 847 | .count = 6, |
| 848 | .timeout = 60 * USEC_PER_SEC, |
| 849 | }, |
| 850 | .thread = { |
| 851 | .offset = 6, |
| 852 | .count = 7, |
| 853 | .timeout = 600 * USEC_PER_SEC, |
| 854 | }, |
| 855 | .cpu_rx = { |
| 856 | .offset = 13, |
| 857 | .count = 1, |
| 858 | .timeout = 0, |
| 859 | }, |
| 860 | }, |
| 861 | .num_resets = 193, |
| 862 | }; |
| 863 | |
| 864 | static const struct of_device_id tegra_bpmp_match[] = { |
| 865 | { .compatible = "nvidia,tegra186-bpmp", .data = &tegra186_soc }, |
| 866 | { } |
| 867 | }; |
| 868 | |
| 869 | static struct platform_driver tegra_bpmp_driver = { |
| 870 | .driver = { |
| 871 | .name = "tegra-bpmp", |
| 872 | .of_match_table = tegra_bpmp_match, |
| 873 | }, |
| 874 | .probe = tegra_bpmp_probe, |
| 875 | }; |
| 876 | |
| 877 | static int __init tegra_bpmp_init(void) |
| 878 | { |
| 879 | return platform_driver_register(&tegra_bpmp_driver); |
| 880 | } |
| 881 | core_initcall(tegra_bpmp_init); |