1 // SPDX-License-Identifier: (GPL-2.0 OR MIT) 2 // 3 // Copyright (c) 2018 BayLibre, SAS. 4 // Author: Jerome Brunet <jbrunet@baylibre.com> 5 6 #include <linux/module.h> 7 #include <linux/of_platform.h> 8 #include <sound/soc.h> 9 #include <sound/soc-dai.h> 10 11 #include "axg-tdm.h" 12 13 struct axg_card { 14 struct snd_soc_card card; 15 void **link_data; 16 }; 17 18 struct axg_dai_link_tdm_mask { 19 u32 tx; 20 u32 rx; 21 }; 22 23 struct axg_dai_link_tdm_data { 24 unsigned int mclk_fs; 25 unsigned int slots; 26 unsigned int slot_width; 27 u32 *tx_mask; 28 u32 *rx_mask; 29 struct axg_dai_link_tdm_mask *codec_masks; 30 }; 31 32 #define PREFIX "amlogic," 33 34 static int axg_card_reallocate_links(struct axg_card *priv, 35 unsigned int num_links) 36 { 37 struct snd_soc_dai_link *links; 38 void **ldata; 39 40 links = krealloc(priv->card.dai_link, 41 num_links * sizeof(*priv->card.dai_link), 42 GFP_KERNEL | __GFP_ZERO); 43 ldata = krealloc(priv->link_data, 44 num_links * sizeof(*priv->link_data), 45 GFP_KERNEL | __GFP_ZERO); 46 47 if (!links || !ldata) { 48 dev_err(priv->card.dev, "failed to allocate links\n"); 49 return -ENOMEM; 50 } 51 52 priv->card.dai_link = links; 53 priv->link_data = ldata; 54 priv->card.num_links = num_links; 55 return 0; 56 } 57 58 static int axg_card_parse_dai(struct snd_soc_card *card, 59 struct device_node *node, 60 struct device_node **dai_of_node, 61 const char **dai_name) 62 { 63 struct of_phandle_args args; 64 int ret; 65 66 if (!dai_name || !dai_of_node || !node) 67 return -EINVAL; 68 69 ret = of_parse_phandle_with_args(node, "sound-dai", 70 "#sound-dai-cells", 0, &args); 71 if (ret) { 72 if (ret != -EPROBE_DEFER) 73 dev_err(card->dev, "can't parse dai %d\n", ret); 74 return ret; 75 } 76 *dai_of_node = args.np; 77 78 return snd_soc_get_dai_name(&args, dai_name); 79 } 80 81 static int axg_card_set_link_name(struct snd_soc_card *card, 82 struct snd_soc_dai_link *link, 83 const char *prefix) 84 { 85 char *name = devm_kasprintf(card->dev, GFP_KERNEL, "%s.%s", 86 prefix, link->cpu_of_node->full_name); 87 if (!name) 88 return -ENOMEM; 89 90 link->name = name; 91 link->stream_name = name; 92 93 return 0; 94 } 95 96 static void axg_card_clean_references(struct axg_card *priv) 97 { 98 struct snd_soc_card *card = &priv->card; 99 struct snd_soc_dai_link *link; 100 int i, j; 101 102 if (card->dai_link) { 103 for (i = 0; i < card->num_links; i++) { 104 link = &card->dai_link[i]; 105 of_node_put(link->cpu_of_node); 106 for (j = 0; j < link->num_codecs; j++) 107 of_node_put(link->codecs[j].of_node); 108 } 109 } 110 111 if (card->aux_dev) { 112 for (i = 0; i < card->num_aux_devs; i++) 113 of_node_put(card->aux_dev[i].codec_of_node); 114 } 115 116 kfree(card->dai_link); 117 kfree(priv->link_data); 118 } 119 120 static int axg_card_add_aux_devices(struct snd_soc_card *card) 121 { 122 struct device_node *node = card->dev->of_node; 123 struct snd_soc_aux_dev *aux; 124 int num, i; 125 126 num = of_count_phandle_with_args(node, "audio-aux-devs", NULL); 127 if (num == -ENOENT) { 128 /* 129 * It is ok to have no auxiliary devices but for this card it 130 * is a strange situtation. Let's warn the about it. 131 */ 132 dev_warn(card->dev, "card has no auxiliary devices\n"); 133 return 0; 134 } else if (num < 0) { 135 dev_err(card->dev, "error getting auxiliary devices: %d\n", 136 num); 137 return num; 138 } 139 140 aux = devm_kcalloc(card->dev, num, sizeof(*aux), GFP_KERNEL); 141 if (!aux) 142 return -ENOMEM; 143 card->aux_dev = aux; 144 card->num_aux_devs = num; 145 146 for (i = 0; i < card->num_aux_devs; i++, aux++) { 147 aux->codec_of_node = 148 of_parse_phandle(node, "audio-aux-devs", i); 149 if (!aux->codec_of_node) 150 return -EINVAL; 151 } 152 153 return 0; 154 } 155 156 static int axg_card_tdm_be_hw_params(struct snd_pcm_substream *substream, 157 struct snd_pcm_hw_params *params) 158 { 159 struct snd_soc_pcm_runtime *rtd = substream->private_data; 160 struct axg_card *priv = snd_soc_card_get_drvdata(rtd->card); 161 struct axg_dai_link_tdm_data *be = 162 (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num]; 163 struct snd_soc_dai *codec_dai; 164 unsigned int mclk; 165 int ret, i; 166 167 if (be->mclk_fs) { 168 mclk = params_rate(params) * be->mclk_fs; 169 170 for (i = 0; i < rtd->num_codecs; i++) { 171 codec_dai = rtd->codec_dais[i]; 172 ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk, 173 SND_SOC_CLOCK_IN); 174 if (ret && ret != -ENOTSUPP) 175 return ret; 176 } 177 178 ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, 0, mclk, 179 SND_SOC_CLOCK_OUT); 180 if (ret && ret != -ENOTSUPP) 181 return ret; 182 } 183 184 return 0; 185 } 186 187 static const struct snd_soc_ops axg_card_tdm_be_ops = { 188 .hw_params = axg_card_tdm_be_hw_params, 189 }; 190 191 static int axg_card_tdm_dai_init(struct snd_soc_pcm_runtime *rtd) 192 { 193 struct axg_card *priv = snd_soc_card_get_drvdata(rtd->card); 194 struct axg_dai_link_tdm_data *be = 195 (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num]; 196 struct snd_soc_dai *codec_dai; 197 int ret, i; 198 199 for (i = 0; i < rtd->num_codecs; i++) { 200 codec_dai = rtd->codec_dais[i]; 201 ret = snd_soc_dai_set_tdm_slot(codec_dai, 202 be->codec_masks[i].tx, 203 be->codec_masks[i].rx, 204 be->slots, be->slot_width); 205 if (ret && ret != -ENOTSUPP) { 206 dev_err(codec_dai->dev, 207 "setting tdm link slots failed\n"); 208 return ret; 209 } 210 } 211 212 ret = axg_tdm_set_tdm_slots(rtd->cpu_dai, be->tx_mask, be->rx_mask, 213 be->slots, be->slot_width); 214 if (ret) { 215 dev_err(rtd->cpu_dai->dev, "setting tdm link slots failed\n"); 216 return ret; 217 } 218 219 return 0; 220 } 221 222 static int axg_card_tdm_dai_lb_init(struct snd_soc_pcm_runtime *rtd) 223 { 224 struct axg_card *priv = snd_soc_card_get_drvdata(rtd->card); 225 struct axg_dai_link_tdm_data *be = 226 (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num]; 227 int ret; 228 229 /* The loopback rx_mask is the pad tx_mask */ 230 ret = axg_tdm_set_tdm_slots(rtd->cpu_dai, NULL, be->tx_mask, 231 be->slots, be->slot_width); 232 if (ret) { 233 dev_err(rtd->cpu_dai->dev, "setting tdm link slots failed\n"); 234 return ret; 235 } 236 237 return 0; 238 } 239 240 static int axg_card_add_tdm_loopback(struct snd_soc_card *card, 241 int *index) 242 { 243 struct axg_card *priv = snd_soc_card_get_drvdata(card); 244 struct snd_soc_dai_link *pad = &card->dai_link[*index]; 245 struct snd_soc_dai_link *lb; 246 int ret; 247 248 /* extend links */ 249 ret = axg_card_reallocate_links(priv, card->num_links + 1); 250 if (ret) 251 return ret; 252 253 lb = &card->dai_link[*index + 1]; 254 255 lb->name = kasprintf(GFP_KERNEL, "%s-lb", pad->name); 256 if (!lb->name) 257 return -ENOMEM; 258 259 lb->stream_name = lb->name; 260 lb->cpu_of_node = pad->cpu_of_node; 261 lb->cpu_dai_name = "TDM Loopback"; 262 lb->codec_name = "snd-soc-dummy"; 263 lb->codec_dai_name = "snd-soc-dummy-dai"; 264 lb->dpcm_capture = 1; 265 lb->no_pcm = 1; 266 lb->ops = &axg_card_tdm_be_ops; 267 lb->init = axg_card_tdm_dai_lb_init; 268 269 /* Provide the same link data to the loopback */ 270 priv->link_data[*index + 1] = priv->link_data[*index]; 271 272 /* 273 * axg_card_clean_references() will iterate over this link, 274 * make sure the node count is balanced 275 */ 276 of_node_get(lb->cpu_of_node); 277 278 /* Let add_links continue where it should */ 279 *index += 1; 280 281 return 0; 282 } 283 284 static unsigned int axg_card_parse_daifmt(struct device_node *node, 285 struct device_node *cpu_node) 286 { 287 struct device_node *bitclkmaster = NULL; 288 struct device_node *framemaster = NULL; 289 unsigned int daifmt; 290 291 daifmt = snd_soc_of_parse_daifmt(node, PREFIX, 292 &bitclkmaster, &framemaster); 293 daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK; 294 295 /* If no master is provided, default to cpu master */ 296 if (!bitclkmaster || bitclkmaster == cpu_node) { 297 daifmt |= (!framemaster || framemaster == cpu_node) ? 298 SND_SOC_DAIFMT_CBS_CFS : SND_SOC_DAIFMT_CBS_CFM; 299 } else { 300 daifmt |= (!framemaster || framemaster == cpu_node) ? 301 SND_SOC_DAIFMT_CBM_CFS : SND_SOC_DAIFMT_CBM_CFM; 302 } 303 304 of_node_put(bitclkmaster); 305 of_node_put(framemaster); 306 307 return daifmt; 308 } 309 310 static int axg_card_parse_cpu_tdm_slots(struct snd_soc_card *card, 311 struct snd_soc_dai_link *link, 312 struct device_node *node, 313 struct axg_dai_link_tdm_data *be) 314 { 315 char propname[32]; 316 u32 tx, rx; 317 int i; 318 319 be->tx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES, 320 sizeof(*be->tx_mask), GFP_KERNEL); 321 be->rx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES, 322 sizeof(*be->rx_mask), GFP_KERNEL); 323 if (!be->tx_mask || !be->rx_mask) 324 return -ENOMEM; 325 326 for (i = 0, tx = 0; i < AXG_TDM_NUM_LANES; i++) { 327 snprintf(propname, 32, "dai-tdm-slot-tx-mask-%d", i); 328 snd_soc_of_get_slot_mask(node, propname, &be->tx_mask[i]); 329 tx = max(tx, be->tx_mask[i]); 330 } 331 332 /* Disable playback is the interface has no tx slots */ 333 if (!tx) 334 link->dpcm_playback = 0; 335 336 for (i = 0, rx = 0; i < AXG_TDM_NUM_LANES; i++) { 337 snprintf(propname, 32, "dai-tdm-slot-rx-mask-%d", i); 338 snd_soc_of_get_slot_mask(node, propname, &be->rx_mask[i]); 339 rx = max(rx, be->rx_mask[i]); 340 } 341 342 /* Disable capture is the interface has no rx slots */ 343 if (!rx) 344 link->dpcm_capture = 0; 345 346 /* ... but the interface should at least have one of them */ 347 if (!tx && !rx) { 348 dev_err(card->dev, "tdm link has no cpu slots\n"); 349 return -EINVAL; 350 } 351 352 of_property_read_u32(node, "dai-tdm-slot-num", &be->slots); 353 if (!be->slots) { 354 /* 355 * If the slot number is not provided, set it such as it 356 * accommodates the largest mask 357 */ 358 be->slots = fls(max(tx, rx)); 359 } else if (be->slots < fls(max(tx, rx)) || be->slots > 32) { 360 /* 361 * Error if the slots can't accommodate the largest mask or 362 * if it is just too big 363 */ 364 dev_err(card->dev, "bad slot number\n"); 365 return -EINVAL; 366 } 367 368 of_property_read_u32(node, "dai-tdm-slot-width", &be->slot_width); 369 370 return 0; 371 } 372 373 static int axg_card_parse_codecs_masks(struct snd_soc_card *card, 374 struct snd_soc_dai_link *link, 375 struct device_node *node, 376 struct axg_dai_link_tdm_data *be) 377 { 378 struct axg_dai_link_tdm_mask *codec_mask; 379 struct device_node *np; 380 381 codec_mask = devm_kcalloc(card->dev, link->num_codecs, 382 sizeof(*codec_mask), GFP_KERNEL); 383 if (!codec_mask) 384 return -ENOMEM; 385 386 be->codec_masks = codec_mask; 387 388 for_each_child_of_node(node, np) { 389 snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask", 390 &codec_mask->rx); 391 snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask", 392 &codec_mask->tx); 393 394 codec_mask++; 395 } 396 397 return 0; 398 } 399 400 static int axg_card_parse_tdm(struct snd_soc_card *card, 401 struct device_node *node, 402 int *index) 403 { 404 struct axg_card *priv = snd_soc_card_get_drvdata(card); 405 struct snd_soc_dai_link *link = &card->dai_link[*index]; 406 struct axg_dai_link_tdm_data *be; 407 int ret; 408 409 /* Allocate tdm link parameters */ 410 be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL); 411 if (!be) 412 return -ENOMEM; 413 priv->link_data[*index] = be; 414 415 /* Setup tdm link */ 416 link->ops = &axg_card_tdm_be_ops; 417 link->init = axg_card_tdm_dai_init; 418 link->dai_fmt = axg_card_parse_daifmt(node, link->cpu_of_node); 419 420 of_property_read_u32(node, "mclk-fs", &be->mclk_fs); 421 422 ret = axg_card_parse_cpu_tdm_slots(card, link, node, be); 423 if (ret) { 424 dev_err(card->dev, "error parsing tdm link slots\n"); 425 return ret; 426 } 427 428 ret = axg_card_parse_codecs_masks(card, link, node, be); 429 if (ret) 430 return ret; 431 432 /* Add loopback if the pad dai has playback */ 433 if (link->dpcm_playback) { 434 ret = axg_card_add_tdm_loopback(card, index); 435 if (ret) 436 return ret; 437 } 438 439 return 0; 440 } 441 442 static int axg_card_set_be_link(struct snd_soc_card *card, 443 struct snd_soc_dai_link *link, 444 struct device_node *node) 445 { 446 struct snd_soc_dai_link_component *codec; 447 struct device_node *np; 448 int ret, num_codecs; 449 450 link->no_pcm = 1; 451 link->dpcm_playback = 1; 452 link->dpcm_capture = 1; 453 454 num_codecs = of_get_child_count(node); 455 if (!num_codecs) { 456 dev_err(card->dev, "be link %s has no codec\n", 457 node->full_name); 458 return -EINVAL; 459 } 460 461 codec = devm_kcalloc(card->dev, num_codecs, sizeof(*codec), GFP_KERNEL); 462 if (!codec) 463 return -ENOMEM; 464 465 link->codecs = codec; 466 link->num_codecs = num_codecs; 467 468 for_each_child_of_node(node, np) { 469 ret = axg_card_parse_dai(card, np, &codec->of_node, 470 &codec->dai_name); 471 if (ret) { 472 of_node_put(np); 473 return ret; 474 } 475 476 codec++; 477 } 478 479 ret = axg_card_set_link_name(card, link, "be"); 480 if (ret) 481 dev_err(card->dev, "error setting %s link name\n", np->name); 482 483 return ret; 484 } 485 486 static int axg_card_set_fe_link(struct snd_soc_card *card, 487 struct snd_soc_dai_link *link, 488 bool is_playback) 489 { 490 link->dynamic = 1; 491 link->dpcm_merged_format = 1; 492 link->dpcm_merged_chan = 1; 493 link->dpcm_merged_rate = 1; 494 link->codec_dai_name = "snd-soc-dummy-dai"; 495 link->codec_name = "snd-soc-dummy"; 496 497 if (is_playback) 498 link->dpcm_playback = 1; 499 else 500 link->dpcm_capture = 1; 501 502 return axg_card_set_link_name(card, link, "fe"); 503 } 504 505 static int axg_card_cpu_is_capture_fe(struct device_node *np) 506 { 507 return of_device_is_compatible(np, PREFIX "axg-toddr"); 508 } 509 510 static int axg_card_cpu_is_playback_fe(struct device_node *np) 511 { 512 return of_device_is_compatible(np, PREFIX "axg-frddr"); 513 } 514 515 static int axg_card_cpu_is_tdm_iface(struct device_node *np) 516 { 517 return of_device_is_compatible(np, PREFIX "axg-tdm-iface"); 518 } 519 520 static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np, 521 int *index) 522 { 523 struct snd_soc_dai_link *dai_link = &card->dai_link[*index]; 524 int ret; 525 526 ret = axg_card_parse_dai(card, np, &dai_link->cpu_of_node, 527 &dai_link->cpu_dai_name); 528 if (ret) 529 return ret; 530 531 if (axg_card_cpu_is_playback_fe(dai_link->cpu_of_node)) 532 ret = axg_card_set_fe_link(card, dai_link, true); 533 else if (axg_card_cpu_is_capture_fe(dai_link->cpu_of_node)) 534 ret = axg_card_set_fe_link(card, dai_link, false); 535 else 536 ret = axg_card_set_be_link(card, dai_link, np); 537 538 if (ret) 539 return ret; 540 541 if (axg_card_cpu_is_tdm_iface(dai_link->cpu_of_node)) 542 ret = axg_card_parse_tdm(card, np, index); 543 544 return ret; 545 } 546 547 static int axg_card_add_links(struct snd_soc_card *card) 548 { 549 struct axg_card *priv = snd_soc_card_get_drvdata(card); 550 struct device_node *node = card->dev->of_node; 551 struct device_node *np; 552 int num, i, ret; 553 554 num = of_get_child_count(node); 555 if (!num) { 556 dev_err(card->dev, "card has no links\n"); 557 return -EINVAL; 558 } 559 560 ret = axg_card_reallocate_links(priv, num); 561 if (ret) 562 return ret; 563 564 i = 0; 565 for_each_child_of_node(node, np) { 566 ret = axg_card_add_link(card, np, &i); 567 if (ret) { 568 of_node_put(np); 569 return ret; 570 } 571 572 i++; 573 } 574 575 return 0; 576 } 577 578 static int axg_card_parse_of_optional(struct snd_soc_card *card, 579 const char *propname, 580 int (*func)(struct snd_soc_card *c, 581 const char *p)) 582 { 583 /* If property is not provided, don't fail ... */ 584 if (!of_property_read_bool(card->dev->of_node, propname)) 585 return 0; 586 587 /* ... but do fail if it is provided and the parsing fails */ 588 return func(card, propname); 589 } 590 591 static const struct of_device_id axg_card_of_match[] = { 592 { .compatible = "amlogic,axg-sound-card", }, 593 {} 594 }; 595 MODULE_DEVICE_TABLE(of, axg_card_of_match); 596 597 static int axg_card_probe(struct platform_device *pdev) 598 { 599 struct device *dev = &pdev->dev; 600 struct axg_card *priv; 601 int ret; 602 603 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 604 if (!priv) 605 return -ENOMEM; 606 607 platform_set_drvdata(pdev, priv); 608 snd_soc_card_set_drvdata(&priv->card, priv); 609 610 priv->card.owner = THIS_MODULE; 611 priv->card.dev = dev; 612 613 ret = snd_soc_of_parse_card_name(&priv->card, "model"); 614 if (ret < 0) 615 return ret; 616 617 ret = axg_card_parse_of_optional(&priv->card, "audio-routing", 618 snd_soc_of_parse_audio_routing); 619 if (ret) { 620 dev_err(dev, "error while parsing routing\n"); 621 return ret; 622 } 623 624 ret = axg_card_parse_of_optional(&priv->card, "audio-widgets", 625 snd_soc_of_parse_audio_simple_widgets); 626 if (ret) { 627 dev_err(dev, "error while parsing widgets\n"); 628 return ret; 629 } 630 631 ret = axg_card_add_links(&priv->card); 632 if (ret) 633 goto out_err; 634 635 ret = axg_card_add_aux_devices(&priv->card); 636 if (ret) 637 goto out_err; 638 639 ret = devm_snd_soc_register_card(dev, &priv->card); 640 if (ret) 641 goto out_err; 642 643 return 0; 644 645 out_err: 646 axg_card_clean_references(priv); 647 return ret; 648 } 649 650 static int axg_card_remove(struct platform_device *pdev) 651 { 652 struct axg_card *priv = platform_get_drvdata(pdev); 653 654 axg_card_clean_references(priv); 655 656 return 0; 657 } 658 659 static struct platform_driver axg_card_pdrv = { 660 .probe = axg_card_probe, 661 .remove = axg_card_remove, 662 .driver = { 663 .name = "axg-sound-card", 664 .of_match_table = axg_card_of_match, 665 }, 666 }; 667 module_platform_driver(axg_card_pdrv); 668 669 MODULE_DESCRIPTION("Amlogic AXG ALSA machine driver"); 670 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); 671 MODULE_LICENSE("GPL v2"); 672