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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 | // SPDX-License-Identifier: GPL-2.0-only /* * tascam-stream.c - a part of driver for TASCAM FireWire series * * Copyright (c) 2015 Takashi Sakamoto */ #include <linux/delay.h> #include "tascam.h" #define CLOCK_STATUS_MASK 0xffff0000 #define CLOCK_CONFIG_MASK 0x0000ffff #define READY_TIMEOUT_MS 4000 static int get_clock(struct snd_tscm *tscm, u32 *data) { int trial = 0; __be32 reg; int err; while (trial++ < 5) { err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS, ®, sizeof(reg), 0); if (err < 0) return err; *data = be32_to_cpu(reg); if (*data & CLOCK_STATUS_MASK) break; // In intermediate state after changing clock status. msleep(50); } // Still in the intermediate state. if (trial >= 5) return -EAGAIN; return 0; } static int set_clock(struct snd_tscm *tscm, unsigned int rate, enum snd_tscm_clock clock) { u32 data; __be32 reg; int err; err = get_clock(tscm, &data); if (err < 0) return err; data &= CLOCK_CONFIG_MASK; if (rate > 0) { data &= 0x000000ff; /* Base rate. */ if ((rate % 44100) == 0) { data |= 0x00000100; /* Multiplier. */ if (rate / 44100 == 2) data |= 0x00008000; } else if ((rate % 48000) == 0) { data |= 0x00000200; /* Multiplier. */ if (rate / 48000 == 2) data |= 0x00008000; } else { return -EAGAIN; } } if (clock != INT_MAX) { data &= 0x0000ff00; data |= clock + 1; } reg = cpu_to_be32(data); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_CLOCK_STATUS, ®, sizeof(reg), 0); if (err < 0) return err; if (data & 0x00008000) reg = cpu_to_be32(0x0000001a); else reg = cpu_to_be32(0x0000000d); return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_MULTIPLEX_MODE, ®, sizeof(reg), 0); } int snd_tscm_stream_get_rate(struct snd_tscm *tscm, unsigned int *rate) { u32 data; int err; err = get_clock(tscm, &data); if (err < 0) return err; data = (data & 0xff000000) >> 24; /* Check base rate. */ if ((data & 0x0f) == 0x01) *rate = 44100; else if ((data & 0x0f) == 0x02) *rate = 48000; else return -EAGAIN; /* Check multiplier. */ if ((data & 0xf0) == 0x80) *rate *= 2; else if ((data & 0xf0) != 0x00) return -EAGAIN; return err; } int snd_tscm_stream_get_clock(struct snd_tscm *tscm, enum snd_tscm_clock *clock) { u32 data; int err; err = get_clock(tscm, &data); if (err < 0) return err; *clock = ((data & 0x00ff0000) >> 16) - 1; if (*clock < 0 || *clock > SND_TSCM_CLOCK_ADAT) return -EIO; return 0; } static int enable_data_channels(struct snd_tscm *tscm) { __be32 reg; u32 data; unsigned int i; int err; data = 0; for (i = 0; i < tscm->spec->pcm_capture_analog_channels; ++i) data |= BIT(i); if (tscm->spec->has_adat) data |= 0x0000ff00; if (tscm->spec->has_spdif) data |= 0x00030000; reg = cpu_to_be32(data); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_TX_PCM_CHANNELS, ®, sizeof(reg), 0); if (err < 0) return err; data = 0; for (i = 0; i < tscm->spec->pcm_playback_analog_channels; ++i) data |= BIT(i); if (tscm->spec->has_adat) data |= 0x0000ff00; if (tscm->spec->has_spdif) data |= 0x00030000; reg = cpu_to_be32(data); return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_RX_PCM_CHANNELS, ®, sizeof(reg), 0); } static int set_stream_formats(struct snd_tscm *tscm, unsigned int rate) { __be32 reg; int err; // Set an option for unknown purpose. reg = cpu_to_be32(0x00200000); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_SET_OPTION, ®, sizeof(reg), 0); if (err < 0) return err; return enable_data_channels(tscm); } static void finish_session(struct snd_tscm *tscm) { __be32 reg; reg = 0; snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_START_STREAMING, ®, sizeof(reg), 0); reg = 0; snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_ON, ®, sizeof(reg), 0); // Unregister channels. reg = cpu_to_be32(0x00000000); snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_CH, ®, sizeof(reg), 0); reg = cpu_to_be32(0x00000000); snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_UNKNOWN, ®, sizeof(reg), 0); reg = cpu_to_be32(0x00000000); snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_CH, ®, sizeof(reg), 0); } static int begin_session(struct snd_tscm *tscm) { __be32 reg; int err; // Register the isochronous channel for transmitting stream. reg = cpu_to_be32(tscm->tx_resources.channel); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_CH, ®, sizeof(reg), 0); if (err < 0) return err; // Unknown. reg = cpu_to_be32(0x00000002); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_UNKNOWN, ®, sizeof(reg), 0); if (err < 0) return err; // Register the isochronous channel for receiving stream. reg = cpu_to_be32(tscm->rx_resources.channel); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_CH, ®, sizeof(reg), 0); if (err < 0) return err; reg = cpu_to_be32(0x00000001); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_START_STREAMING, ®, sizeof(reg), 0); if (err < 0) return err; reg = cpu_to_be32(0x00000001); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_RX_ON, ®, sizeof(reg), 0); if (err < 0) return err; // Set an option for unknown purpose. reg = cpu_to_be32(0x00002000); err = snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_SET_OPTION, ®, sizeof(reg), 0); if (err < 0) return err; // Start multiplexing PCM samples on packets. reg = cpu_to_be32(0x00000001); return snd_fw_transaction(tscm->unit, TCODE_WRITE_QUADLET_REQUEST, TSCM_ADDR_BASE + TSCM_OFFSET_ISOC_TX_ON, ®, sizeof(reg), 0); } static int keep_resources(struct snd_tscm *tscm, unsigned int rate, struct amdtp_stream *stream) { struct fw_iso_resources *resources; int err; if (stream == &tscm->tx_stream) resources = &tscm->tx_resources; else resources = &tscm->rx_resources; err = amdtp_tscm_set_parameters(stream, rate); if (err < 0) return err; return fw_iso_resources_allocate(resources, amdtp_stream_get_max_payload(stream), fw_parent_device(tscm->unit)->max_speed); } static int init_stream(struct snd_tscm *tscm, struct amdtp_stream *s) { struct fw_iso_resources *resources; enum amdtp_stream_direction dir; unsigned int pcm_channels; int err; if (s == &tscm->tx_stream) { resources = &tscm->tx_resources; dir = AMDTP_IN_STREAM; pcm_channels = tscm->spec->pcm_capture_analog_channels; } else { resources = &tscm->rx_resources; dir = AMDTP_OUT_STREAM; pcm_channels = tscm->spec->pcm_playback_analog_channels; } if (tscm->spec->has_adat) pcm_channels += 8; if (tscm->spec->has_spdif) pcm_channels += 2; err = fw_iso_resources_init(resources, tscm->unit); if (err < 0) return err; err = amdtp_tscm_init(s, tscm->unit, dir, pcm_channels); if (err < 0) fw_iso_resources_free(resources); return err; } static void destroy_stream(struct snd_tscm *tscm, struct amdtp_stream *s) { amdtp_stream_destroy(s); if (s == &tscm->tx_stream) fw_iso_resources_destroy(&tscm->tx_resources); else fw_iso_resources_destroy(&tscm->rx_resources); } int snd_tscm_stream_init_duplex(struct snd_tscm *tscm) { int err; err = init_stream(tscm, &tscm->tx_stream); if (err < 0) return err; err = init_stream(tscm, &tscm->rx_stream); if (err < 0) { destroy_stream(tscm, &tscm->tx_stream); return err; } err = amdtp_domain_init(&tscm->domain); if (err < 0) { destroy_stream(tscm, &tscm->tx_stream); destroy_stream(tscm, &tscm->rx_stream); } return err; } // At bus reset, streaming is stopped and some registers are clear. void snd_tscm_stream_update_duplex(struct snd_tscm *tscm) { amdtp_domain_stop(&tscm->domain); amdtp_stream_pcm_abort(&tscm->tx_stream); amdtp_stream_pcm_abort(&tscm->rx_stream); } // This function should be called before starting streams or after stopping // streams. void snd_tscm_stream_destroy_duplex(struct snd_tscm *tscm) { amdtp_domain_destroy(&tscm->domain); destroy_stream(tscm, &tscm->rx_stream); destroy_stream(tscm, &tscm->tx_stream); } int snd_tscm_stream_reserve_duplex(struct snd_tscm *tscm, unsigned int rate, unsigned int frames_per_period, unsigned int frames_per_buffer) { unsigned int curr_rate; int err; err = snd_tscm_stream_get_rate(tscm, &curr_rate); if (err < 0) return err; if (tscm->substreams_counter == 0 || rate != curr_rate) { amdtp_domain_stop(&tscm->domain); finish_session(tscm); fw_iso_resources_free(&tscm->tx_resources); fw_iso_resources_free(&tscm->rx_resources); err = set_clock(tscm, rate, INT_MAX); if (err < 0) return err; err = keep_resources(tscm, rate, &tscm->tx_stream); if (err < 0) return err; err = keep_resources(tscm, rate, &tscm->rx_stream); if (err < 0) { fw_iso_resources_free(&tscm->tx_resources); return err; } err = amdtp_domain_set_events_per_period(&tscm->domain, frames_per_period, frames_per_buffer); if (err < 0) { fw_iso_resources_free(&tscm->tx_resources); fw_iso_resources_free(&tscm->rx_resources); return err; } tscm->need_long_tx_init_skip = (rate != curr_rate); } return 0; } int snd_tscm_stream_start_duplex(struct snd_tscm *tscm, unsigned int rate) { unsigned int generation = tscm->rx_resources.generation; int err; if (tscm->substreams_counter == 0) return 0; if (amdtp_streaming_error(&tscm->rx_stream) || amdtp_streaming_error(&tscm->tx_stream)) { amdtp_domain_stop(&tscm->domain); finish_session(tscm); } if (generation != fw_parent_device(tscm->unit)->card->generation) { err = fw_iso_resources_update(&tscm->tx_resources); if (err < 0) goto error; err = fw_iso_resources_update(&tscm->rx_resources); if (err < 0) goto error; } if (!amdtp_stream_running(&tscm->rx_stream)) { int spd = fw_parent_device(tscm->unit)->max_speed; unsigned int tx_init_skip_cycles; err = set_stream_formats(tscm, rate); if (err < 0) goto error; err = begin_session(tscm); if (err < 0) goto error; err = amdtp_domain_add_stream(&tscm->domain, &tscm->rx_stream, tscm->rx_resources.channel, spd); if (err < 0) goto error; err = amdtp_domain_add_stream(&tscm->domain, &tscm->tx_stream, tscm->tx_resources.channel, spd); if (err < 0) goto error; if (tscm->need_long_tx_init_skip) tx_init_skip_cycles = 16000; else tx_init_skip_cycles = 0; // MEMO: Just after starting packet streaming, it transfers packets without any // event. Enough after receiving the sequence of packets, it multiplexes events into // the packet. However, just after changing sampling transfer frequency, it stops // multiplexing during packet transmission. Enough after, it restarts multiplexing // again. The device ignores presentation time expressed by the value of syt field // of CIP header in received packets. The sequence of the number of data blocks per // packet is important for media clock recovery. err = amdtp_domain_start(&tscm->domain, tx_init_skip_cycles, true, true); if (err < 0) return err; if (!amdtp_domain_wait_ready(&tscm->domain, READY_TIMEOUT_MS)) { err = -ETIMEDOUT; goto error; } } return 0; error: amdtp_domain_stop(&tscm->domain); finish_session(tscm); return err; } void snd_tscm_stream_stop_duplex(struct snd_tscm *tscm) { if (tscm->substreams_counter == 0) { amdtp_domain_stop(&tscm->domain); finish_session(tscm); fw_iso_resources_free(&tscm->tx_resources); fw_iso_resources_free(&tscm->rx_resources); tscm->need_long_tx_init_skip = false; } } void snd_tscm_stream_lock_changed(struct snd_tscm *tscm) { tscm->dev_lock_changed = true; wake_up(&tscm->hwdep_wait); } int snd_tscm_stream_lock_try(struct snd_tscm *tscm) { int err; spin_lock_irq(&tscm->lock); /* user land lock this */ if (tscm->dev_lock_count < 0) { err = -EBUSY; goto end; } /* this is the first time */ if (tscm->dev_lock_count++ == 0) snd_tscm_stream_lock_changed(tscm); err = 0; end: spin_unlock_irq(&tscm->lock); return err; } void snd_tscm_stream_lock_release(struct snd_tscm *tscm) { spin_lock_irq(&tscm->lock); if (WARN_ON(tscm->dev_lock_count <= 0)) goto end; if (--tscm->dev_lock_count == 0) snd_tscm_stream_lock_changed(tscm); end: spin_unlock_irq(&tscm->lock); } |