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/clk.h> 7 #include <linux/module.h> 8 #include <linux/of_platform.h> 9 #include <sound/pcm_params.h> 10 #include <sound/soc.h> 11 #include <sound/soc-dai.h> 12 13 #include "axg-tdm.h" 14 15 /* Maximum bit clock frequency according the datasheets */ 16 #define MAX_SCLK 100000000 /* Hz */ 17 18 enum { 19 TDM_IFACE_PAD, 20 TDM_IFACE_LOOPBACK, 21 }; 22 23 static unsigned int axg_tdm_slots_total(u32 *mask) 24 { 25 unsigned int slots = 0; 26 int i; 27 28 if (!mask) 29 return 0; 30 31 /* Count the total number of slots provided by all 4 lanes */ 32 for (i = 0; i < AXG_TDM_NUM_LANES; i++) 33 slots += hweight32(mask[i]); 34 35 return slots; 36 } 37 38 int axg_tdm_set_tdm_slots(struct snd_soc_dai *dai, u32 *tx_mask, 39 u32 *rx_mask, unsigned int slots, 40 unsigned int slot_width) 41 { 42 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 43 struct axg_tdm_stream *tx = snd_soc_dai_dma_data_get_playback(dai); 44 struct axg_tdm_stream *rx = snd_soc_dai_dma_data_get_capture(dai); 45 unsigned int tx_slots, rx_slots; 46 unsigned int fmt = 0; 47 48 tx_slots = axg_tdm_slots_total(tx_mask); 49 rx_slots = axg_tdm_slots_total(rx_mask); 50 51 /* We should at least have a slot for a valid interface */ 52 if (!tx_slots && !rx_slots) { 53 dev_err(dai->dev, "interface has no slot\n"); 54 return -EINVAL; 55 } 56 57 iface->slots = slots; 58 59 switch (slot_width) { 60 case 0: 61 slot_width = 32; 62 fallthrough; 63 case 32: 64 fmt |= SNDRV_PCM_FMTBIT_S32_LE; 65 fallthrough; 66 case 24: 67 fmt |= SNDRV_PCM_FMTBIT_S24_LE; 68 fmt |= SNDRV_PCM_FMTBIT_S20_LE; 69 fallthrough; 70 case 16: 71 fmt |= SNDRV_PCM_FMTBIT_S16_LE; 72 fallthrough; 73 case 8: 74 fmt |= SNDRV_PCM_FMTBIT_S8; 75 break; 76 default: 77 dev_err(dai->dev, "unsupported slot width: %d\n", slot_width); 78 return -EINVAL; 79 } 80 81 iface->slot_width = slot_width; 82 83 /* Amend the dai driver and let dpcm merge do its job */ 84 if (tx) { 85 tx->mask = tx_mask; 86 dai->driver->playback.channels_max = tx_slots; 87 dai->driver->playback.formats = fmt; 88 } 89 90 if (rx) { 91 rx->mask = rx_mask; 92 dai->driver->capture.channels_max = rx_slots; 93 dai->driver->capture.formats = fmt; 94 } 95 96 return 0; 97 } 98 EXPORT_SYMBOL_GPL(axg_tdm_set_tdm_slots); 99 100 static int axg_tdm_iface_set_sysclk(struct snd_soc_dai *dai, int clk_id, 101 unsigned int freq, int dir) 102 { 103 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 104 int ret = -ENOTSUPP; 105 106 if (dir == SND_SOC_CLOCK_OUT && clk_id == 0) { 107 if (!iface->mclk) { 108 dev_warn(dai->dev, "master clock not provided\n"); 109 } else { 110 ret = clk_set_rate(iface->mclk, freq); 111 if (!ret) 112 iface->mclk_rate = freq; 113 } 114 } 115 116 return ret; 117 } 118 119 static int axg_tdm_iface_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) 120 { 121 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 122 123 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) { 124 case SND_SOC_DAIFMT_BP_FP: 125 if (!iface->mclk) { 126 dev_err(dai->dev, "cpu clock master: mclk missing\n"); 127 return -ENODEV; 128 } 129 break; 130 131 case SND_SOC_DAIFMT_BC_FC: 132 break; 133 134 case SND_SOC_DAIFMT_BP_FC: 135 case SND_SOC_DAIFMT_BC_FP: 136 dev_err(dai->dev, "only BP_FP and BC_FC are supported\n"); 137 fallthrough; 138 default: 139 return -EINVAL; 140 } 141 142 iface->fmt = fmt; 143 return 0; 144 } 145 146 static int axg_tdm_iface_startup(struct snd_pcm_substream *substream, 147 struct snd_soc_dai *dai) 148 { 149 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 150 struct axg_tdm_stream *ts = 151 snd_soc_dai_get_dma_data(dai, substream); 152 int ret; 153 154 if (!axg_tdm_slots_total(ts->mask)) { 155 dev_err(dai->dev, "interface has not slots\n"); 156 return -EINVAL; 157 } 158 159 if (snd_soc_component_active(dai->component)) { 160 /* Apply component wide rate symmetry */ 161 ret = snd_pcm_hw_constraint_single(substream->runtime, 162 SNDRV_PCM_HW_PARAM_RATE, 163 iface->rate); 164 165 } else { 166 /* Limit rate according to the slot number and width */ 167 unsigned int max_rate = 168 MAX_SCLK / (iface->slots * iface->slot_width); 169 ret = snd_pcm_hw_constraint_minmax(substream->runtime, 170 SNDRV_PCM_HW_PARAM_RATE, 171 0, max_rate); 172 } 173 174 if (ret < 0) 175 dev_err(dai->dev, "can't set iface rate constraint\n"); 176 else 177 ret = 0; 178 179 return ret; 180 } 181 182 static int axg_tdm_iface_set_stream(struct snd_pcm_substream *substream, 183 struct snd_pcm_hw_params *params, 184 struct snd_soc_dai *dai) 185 { 186 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 187 struct axg_tdm_stream *ts = snd_soc_dai_get_dma_data(dai, substream); 188 unsigned int channels = params_channels(params); 189 unsigned int width = params_width(params); 190 191 /* Save rate and sample_bits for component symmetry */ 192 iface->rate = params_rate(params); 193 194 /* Make sure this interface can cope with the stream */ 195 if (axg_tdm_slots_total(ts->mask) < channels) { 196 dev_err(dai->dev, "not enough slots for channels\n"); 197 return -EINVAL; 198 } 199 200 if (iface->slot_width < width) { 201 dev_err(dai->dev, "incompatible slots width for stream\n"); 202 return -EINVAL; 203 } 204 205 /* Save the parameter for tdmout/tdmin widgets */ 206 ts->physical_width = params_physical_width(params); 207 ts->width = params_width(params); 208 ts->channels = params_channels(params); 209 210 return 0; 211 } 212 213 static int axg_tdm_iface_set_lrclk(struct snd_soc_dai *dai, 214 struct snd_pcm_hw_params *params) 215 { 216 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 217 unsigned int ratio_num; 218 int ret; 219 220 ret = clk_set_rate(iface->lrclk, params_rate(params)); 221 if (ret) { 222 dev_err(dai->dev, "setting sample clock failed: %d\n", ret); 223 return ret; 224 } 225 226 switch (iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 227 case SND_SOC_DAIFMT_I2S: 228 case SND_SOC_DAIFMT_LEFT_J: 229 case SND_SOC_DAIFMT_RIGHT_J: 230 /* 50% duty cycle ratio */ 231 ratio_num = 1; 232 break; 233 234 case SND_SOC_DAIFMT_DSP_A: 235 case SND_SOC_DAIFMT_DSP_B: 236 /* 237 * A zero duty cycle ratio will result in setting the mininum 238 * ratio possible which, for this clock, is 1 cycle of the 239 * parent bclk clock high and the rest low, This is exactly 240 * what we want here. 241 */ 242 ratio_num = 0; 243 break; 244 245 default: 246 return -EINVAL; 247 } 248 249 ret = clk_set_duty_cycle(iface->lrclk, ratio_num, 2); 250 if (ret) { 251 dev_err(dai->dev, 252 "setting sample clock duty cycle failed: %d\n", ret); 253 return ret; 254 } 255 256 /* Set sample clock inversion */ 257 ret = clk_set_phase(iface->lrclk, 258 axg_tdm_lrclk_invert(iface->fmt) ? 180 : 0); 259 if (ret) { 260 dev_err(dai->dev, 261 "setting sample clock phase failed: %d\n", ret); 262 return ret; 263 } 264 265 return 0; 266 } 267 268 static int axg_tdm_iface_set_sclk(struct snd_soc_dai *dai, 269 struct snd_pcm_hw_params *params) 270 { 271 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 272 unsigned long srate; 273 int ret; 274 275 srate = iface->slots * iface->slot_width * params_rate(params); 276 277 if (!iface->mclk_rate) { 278 /* If no specific mclk is requested, default to bit clock * 2 */ 279 clk_set_rate(iface->mclk, 2 * srate); 280 } else { 281 /* Check if we can actually get the bit clock from mclk */ 282 if (iface->mclk_rate % srate) { 283 dev_err(dai->dev, 284 "can't derive sclk %lu from mclk %lu\n", 285 srate, iface->mclk_rate); 286 return -EINVAL; 287 } 288 } 289 290 ret = clk_set_rate(iface->sclk, srate); 291 if (ret) { 292 dev_err(dai->dev, "setting bit clock failed: %d\n", ret); 293 return ret; 294 } 295 296 /* Set the bit clock inversion */ 297 ret = clk_set_phase(iface->sclk, 298 axg_tdm_sclk_invert(iface->fmt) ? 0 : 180); 299 if (ret) { 300 dev_err(dai->dev, "setting bit clock phase failed: %d\n", ret); 301 return ret; 302 } 303 304 return ret; 305 } 306 307 static int axg_tdm_iface_hw_params(struct snd_pcm_substream *substream, 308 struct snd_pcm_hw_params *params, 309 struct snd_soc_dai *dai) 310 { 311 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 312 struct axg_tdm_stream *ts = snd_soc_dai_get_dma_data(dai, substream); 313 int ret; 314 315 switch (iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 316 case SND_SOC_DAIFMT_I2S: 317 case SND_SOC_DAIFMT_LEFT_J: 318 case SND_SOC_DAIFMT_RIGHT_J: 319 if (iface->slots > 2) { 320 dev_err(dai->dev, "bad slot number for format: %d\n", 321 iface->slots); 322 return -EINVAL; 323 } 324 break; 325 326 case SND_SOC_DAIFMT_DSP_A: 327 case SND_SOC_DAIFMT_DSP_B: 328 break; 329 330 default: 331 dev_err(dai->dev, "unsupported dai format\n"); 332 return -EINVAL; 333 } 334 335 ret = axg_tdm_iface_set_stream(substream, params, dai); 336 if (ret) 337 return ret; 338 339 if ((iface->fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) == 340 SND_SOC_DAIFMT_BP_FP) { 341 ret = axg_tdm_iface_set_sclk(dai, params); 342 if (ret) 343 return ret; 344 345 ret = axg_tdm_iface_set_lrclk(dai, params); 346 if (ret) 347 return ret; 348 } 349 350 ret = axg_tdm_stream_set_cont_clocks(ts, iface->fmt); 351 if (ret) 352 dev_err(dai->dev, "failed to apply continuous clock setting\n"); 353 354 return ret; 355 } 356 357 static int axg_tdm_iface_hw_free(struct snd_pcm_substream *substream, 358 struct snd_soc_dai *dai) 359 { 360 struct axg_tdm_stream *ts = snd_soc_dai_get_dma_data(dai, substream); 361 362 return axg_tdm_stream_set_cont_clocks(ts, 0); 363 } 364 365 static int axg_tdm_iface_trigger(struct snd_pcm_substream *substream, 366 int cmd, 367 struct snd_soc_dai *dai) 368 { 369 struct axg_tdm_stream *ts = 370 snd_soc_dai_get_dma_data(dai, substream); 371 372 switch (cmd) { 373 case SNDRV_PCM_TRIGGER_START: 374 case SNDRV_PCM_TRIGGER_RESUME: 375 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 376 axg_tdm_stream_start(ts); 377 break; 378 case SNDRV_PCM_TRIGGER_SUSPEND: 379 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 380 case SNDRV_PCM_TRIGGER_STOP: 381 axg_tdm_stream_stop(ts); 382 break; 383 default: 384 return -EINVAL; 385 } 386 387 return 0; 388 } 389 390 static int axg_tdm_iface_remove_dai(struct snd_soc_dai *dai) 391 { 392 int stream; 393 394 for_each_pcm_streams(stream) { 395 struct axg_tdm_stream *ts = snd_soc_dai_dma_data_get(dai, stream); 396 397 if (ts) 398 axg_tdm_stream_free(ts); 399 } 400 401 return 0; 402 } 403 404 static int axg_tdm_iface_probe_dai(struct snd_soc_dai *dai) 405 { 406 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai); 407 int stream; 408 409 for_each_pcm_streams(stream) { 410 struct axg_tdm_stream *ts; 411 412 if (!snd_soc_dai_get_widget(dai, stream)) 413 continue; 414 415 ts = axg_tdm_stream_alloc(iface); 416 if (!ts) { 417 axg_tdm_iface_remove_dai(dai); 418 return -ENOMEM; 419 } 420 snd_soc_dai_dma_data_set(dai, stream, ts); 421 } 422 423 return 0; 424 } 425 426 static const struct snd_soc_dai_ops axg_tdm_iface_ops = { 427 .probe = axg_tdm_iface_probe_dai, 428 .remove = axg_tdm_iface_remove_dai, 429 .set_sysclk = axg_tdm_iface_set_sysclk, 430 .set_fmt = axg_tdm_iface_set_fmt, 431 .startup = axg_tdm_iface_startup, 432 .hw_params = axg_tdm_iface_hw_params, 433 .hw_free = axg_tdm_iface_hw_free, 434 .trigger = axg_tdm_iface_trigger, 435 }; 436 437 /* TDM Backend DAIs */ 438 static const struct snd_soc_dai_driver axg_tdm_iface_dai_drv[] = { 439 [TDM_IFACE_PAD] = { 440 .name = "TDM Pad", 441 .playback = { 442 .stream_name = "Playback", 443 .channels_min = 1, 444 .channels_max = AXG_TDM_CHANNEL_MAX, 445 .rates = AXG_TDM_RATES, 446 .formats = AXG_TDM_FORMATS, 447 }, 448 .capture = { 449 .stream_name = "Capture", 450 .channels_min = 1, 451 .channels_max = AXG_TDM_CHANNEL_MAX, 452 .rates = AXG_TDM_RATES, 453 .formats = AXG_TDM_FORMATS, 454 }, 455 .id = TDM_IFACE_PAD, 456 .ops = &axg_tdm_iface_ops, 457 }, 458 [TDM_IFACE_LOOPBACK] = { 459 .name = "TDM Loopback", 460 .capture = { 461 .stream_name = "Loopback", 462 .channels_min = 1, 463 .channels_max = AXG_TDM_CHANNEL_MAX, 464 .rates = AXG_TDM_RATES, 465 .formats = AXG_TDM_FORMATS, 466 }, 467 .id = TDM_IFACE_LOOPBACK, 468 .ops = &axg_tdm_iface_ops, 469 }, 470 }; 471 472 static int axg_tdm_iface_set_bias_level(struct snd_soc_component *component, 473 enum snd_soc_bias_level level) 474 { 475 struct axg_tdm_iface *iface = snd_soc_component_get_drvdata(component); 476 enum snd_soc_bias_level now = 477 snd_soc_component_get_bias_level(component); 478 int ret = 0; 479 480 switch (level) { 481 case SND_SOC_BIAS_PREPARE: 482 if (now == SND_SOC_BIAS_STANDBY) 483 ret = clk_prepare_enable(iface->mclk); 484 break; 485 486 case SND_SOC_BIAS_STANDBY: 487 if (now == SND_SOC_BIAS_PREPARE) 488 clk_disable_unprepare(iface->mclk); 489 break; 490 491 case SND_SOC_BIAS_OFF: 492 case SND_SOC_BIAS_ON: 493 break; 494 } 495 496 return ret; 497 } 498 499 static const struct snd_soc_dapm_widget axg_tdm_iface_dapm_widgets[] = { 500 SND_SOC_DAPM_SIGGEN("Playback Signal"), 501 }; 502 503 static const struct snd_soc_dapm_route axg_tdm_iface_dapm_routes[] = { 504 { "Loopback", NULL, "Playback Signal" }, 505 }; 506 507 static const struct snd_soc_component_driver axg_tdm_iface_component_drv = { 508 .dapm_widgets = axg_tdm_iface_dapm_widgets, 509 .num_dapm_widgets = ARRAY_SIZE(axg_tdm_iface_dapm_widgets), 510 .dapm_routes = axg_tdm_iface_dapm_routes, 511 .num_dapm_routes = ARRAY_SIZE(axg_tdm_iface_dapm_routes), 512 .set_bias_level = axg_tdm_iface_set_bias_level, 513 }; 514 515 static const struct of_device_id axg_tdm_iface_of_match[] = { 516 { .compatible = "amlogic,axg-tdm-iface", }, 517 {} 518 }; 519 MODULE_DEVICE_TABLE(of, axg_tdm_iface_of_match); 520 521 static int axg_tdm_iface_probe(struct platform_device *pdev) 522 { 523 struct device *dev = &pdev->dev; 524 struct snd_soc_dai_driver *dai_drv; 525 struct axg_tdm_iface *iface; 526 int i; 527 528 iface = devm_kzalloc(dev, sizeof(*iface), GFP_KERNEL); 529 if (!iface) 530 return -ENOMEM; 531 platform_set_drvdata(pdev, iface); 532 533 /* 534 * Duplicate dai driver: depending on the slot masks configuration 535 * We'll change the number of channel provided by DAI stream, so dpcm 536 * channel merge can be done properly 537 */ 538 dai_drv = devm_kcalloc(dev, ARRAY_SIZE(axg_tdm_iface_dai_drv), 539 sizeof(*dai_drv), GFP_KERNEL); 540 if (!dai_drv) 541 return -ENOMEM; 542 543 for (i = 0; i < ARRAY_SIZE(axg_tdm_iface_dai_drv); i++) 544 memcpy(&dai_drv[i], &axg_tdm_iface_dai_drv[i], 545 sizeof(*dai_drv)); 546 547 /* Bit clock provided on the pad */ 548 iface->sclk = devm_clk_get(dev, "sclk"); 549 if (IS_ERR(iface->sclk)) 550 return dev_err_probe(dev, PTR_ERR(iface->sclk), "failed to get sclk\n"); 551 552 /* Sample clock provided on the pad */ 553 iface->lrclk = devm_clk_get(dev, "lrclk"); 554 if (IS_ERR(iface->lrclk)) 555 return dev_err_probe(dev, PTR_ERR(iface->lrclk), "failed to get lrclk\n"); 556 557 /* 558 * mclk maybe be missing when the cpu dai is in slave mode and 559 * the codec does not require it to provide a master clock. 560 * At this point, ignore the error if mclk is missing. We'll 561 * throw an error if the cpu dai is master and mclk is missing 562 */ 563 iface->mclk = devm_clk_get_optional(dev, "mclk"); 564 if (IS_ERR(iface->mclk)) 565 return dev_err_probe(dev, PTR_ERR(iface->mclk), "failed to get mclk\n"); 566 567 return devm_snd_soc_register_component(dev, 568 &axg_tdm_iface_component_drv, dai_drv, 569 ARRAY_SIZE(axg_tdm_iface_dai_drv)); 570 } 571 572 static struct platform_driver axg_tdm_iface_pdrv = { 573 .probe = axg_tdm_iface_probe, 574 .driver = { 575 .name = "axg-tdm-iface", 576 .of_match_table = axg_tdm_iface_of_match, 577 }, 578 }; 579 module_platform_driver(axg_tdm_iface_pdrv); 580 581 MODULE_DESCRIPTION("Amlogic AXG TDM interface driver"); 582 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); 583 MODULE_LICENSE("GPL v2"); 584