1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Freescale ASRC ALSA SoC Platform (DMA) driver 4 // 5 // Copyright (C) 2014 Freescale Semiconductor, Inc. 6 // 7 // Author: Nicolin Chen <nicoleotsuka@gmail.com> 8 9 #include <linux/dma-mapping.h> 10 #include <linux/module.h> 11 #include <linux/platform_data/dma-imx.h> 12 #include <sound/dmaengine_pcm.h> 13 #include <sound/pcm_params.h> 14 15 #include "fsl_asrc_common.h" 16 17 #define FSL_ASRC_DMABUF_SIZE (256 * 1024) 18 19 static struct snd_pcm_hardware snd_imx_hardware = { 20 .info = SNDRV_PCM_INFO_INTERLEAVED | 21 SNDRV_PCM_INFO_BLOCK_TRANSFER | 22 SNDRV_PCM_INFO_MMAP | 23 SNDRV_PCM_INFO_MMAP_VALID, 24 .buffer_bytes_max = FSL_ASRC_DMABUF_SIZE, 25 .period_bytes_min = 128, 26 .period_bytes_max = 65535, /* Limited by SDMA engine */ 27 .periods_min = 2, 28 .periods_max = 255, 29 .fifo_size = 0, 30 }; 31 32 static bool filter(struct dma_chan *chan, void *param) 33 { 34 if (!imx_dma_is_general_purpose(chan)) 35 return false; 36 37 chan->private = param; 38 39 return true; 40 } 41 42 static void fsl_asrc_dma_complete(void *arg) 43 { 44 struct snd_pcm_substream *substream = arg; 45 struct snd_pcm_runtime *runtime = substream->runtime; 46 struct fsl_asrc_pair *pair = runtime->private_data; 47 48 pair->pos += snd_pcm_lib_period_bytes(substream); 49 if (pair->pos >= snd_pcm_lib_buffer_bytes(substream)) 50 pair->pos = 0; 51 52 snd_pcm_period_elapsed(substream); 53 } 54 55 static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream, 56 struct snd_soc_component *component) 57 { 58 u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN; 59 struct snd_pcm_runtime *runtime = substream->runtime; 60 struct fsl_asrc_pair *pair = runtime->private_data; 61 struct device *dev = component->dev; 62 unsigned long flags = DMA_CTRL_ACK; 63 64 /* Prepare and submit Front-End DMA channel */ 65 if (!substream->runtime->no_period_wakeup) 66 flags |= DMA_PREP_INTERRUPT; 67 68 pair->pos = 0; 69 pair->desc[!dir] = dmaengine_prep_dma_cyclic( 70 pair->dma_chan[!dir], runtime->dma_addr, 71 snd_pcm_lib_buffer_bytes(substream), 72 snd_pcm_lib_period_bytes(substream), 73 dir == OUT ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, flags); 74 if (!pair->desc[!dir]) { 75 dev_err(dev, "failed to prepare slave DMA for Front-End\n"); 76 return -ENOMEM; 77 } 78 79 pair->desc[!dir]->callback = fsl_asrc_dma_complete; 80 pair->desc[!dir]->callback_param = substream; 81 82 dmaengine_submit(pair->desc[!dir]); 83 84 /* Prepare and submit Back-End DMA channel */ 85 pair->desc[dir] = dmaengine_prep_dma_cyclic( 86 pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0); 87 if (!pair->desc[dir]) { 88 dev_err(dev, "failed to prepare slave DMA for Back-End\n"); 89 return -ENOMEM; 90 } 91 92 dmaengine_submit(pair->desc[dir]); 93 94 return 0; 95 } 96 97 static int fsl_asrc_dma_trigger(struct snd_soc_component *component, 98 struct snd_pcm_substream *substream, int cmd) 99 { 100 struct snd_pcm_runtime *runtime = substream->runtime; 101 struct fsl_asrc_pair *pair = runtime->private_data; 102 int ret; 103 104 switch (cmd) { 105 case SNDRV_PCM_TRIGGER_START: 106 case SNDRV_PCM_TRIGGER_RESUME: 107 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 108 ret = fsl_asrc_dma_prepare_and_submit(substream, component); 109 if (ret) 110 return ret; 111 dma_async_issue_pending(pair->dma_chan[IN]); 112 dma_async_issue_pending(pair->dma_chan[OUT]); 113 break; 114 case SNDRV_PCM_TRIGGER_STOP: 115 case SNDRV_PCM_TRIGGER_SUSPEND: 116 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 117 dmaengine_terminate_all(pair->dma_chan[OUT]); 118 dmaengine_terminate_all(pair->dma_chan[IN]); 119 break; 120 default: 121 return -EINVAL; 122 } 123 124 return 0; 125 } 126 127 static int fsl_asrc_dma_hw_params(struct snd_soc_component *component, 128 struct snd_pcm_substream *substream, 129 struct snd_pcm_hw_params *params) 130 { 131 enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; 132 struct snd_soc_pcm_runtime *rtd = substream->private_data; 133 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 134 struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL; 135 struct snd_dmaengine_dai_dma_data *dma_params_be = NULL; 136 struct snd_pcm_runtime *runtime = substream->runtime; 137 struct fsl_asrc_pair *pair = runtime->private_data; 138 struct dma_chan *tmp_chan = NULL, *be_chan = NULL; 139 struct snd_soc_component *component_be = NULL; 140 struct fsl_asrc *asrc = pair->asrc; 141 struct dma_slave_config config_fe, config_be; 142 enum asrc_pair_index index = pair->index; 143 struct device *dev = component->dev; 144 int stream = substream->stream; 145 struct imx_dma_data *tmp_data; 146 struct snd_soc_dpcm *dpcm; 147 struct device *dev_be; 148 u8 dir = tx ? OUT : IN; 149 dma_cap_mask_t mask; 150 int ret, width; 151 152 /* Fetch the Back-End dma_data from DPCM */ 153 for_each_dpcm_be(rtd, stream, dpcm) { 154 struct snd_soc_pcm_runtime *be = dpcm->be; 155 struct snd_pcm_substream *substream_be; 156 struct snd_soc_dai *dai = asoc_rtd_to_cpu(be, 0); 157 158 if (dpcm->fe != rtd) 159 continue; 160 161 substream_be = snd_soc_dpcm_get_substream(be, stream); 162 dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be); 163 dev_be = dai->dev; 164 break; 165 } 166 167 if (!dma_params_be) { 168 dev_err(dev, "failed to get the substream of Back-End\n"); 169 return -EINVAL; 170 } 171 172 /* Override dma_data of the Front-End and config its dmaengine */ 173 dma_params_fe = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); 174 dma_params_fe->addr = asrc->paddr + asrc->get_fifo_addr(!dir, index); 175 dma_params_fe->maxburst = dma_params_be->maxburst; 176 177 pair->dma_chan[!dir] = asrc->get_dma_channel(pair, !dir); 178 if (!pair->dma_chan[!dir]) { 179 dev_err(dev, "failed to request DMA channel\n"); 180 return -EINVAL; 181 } 182 183 memset(&config_fe, 0, sizeof(config_fe)); 184 ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe); 185 if (ret) { 186 dev_err(dev, "failed to prepare DMA config for Front-End\n"); 187 return ret; 188 } 189 190 ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe); 191 if (ret) { 192 dev_err(dev, "failed to config DMA channel for Front-End\n"); 193 return ret; 194 } 195 196 /* Request and config DMA channel for Back-End */ 197 dma_cap_zero(mask); 198 dma_cap_set(DMA_SLAVE, mask); 199 dma_cap_set(DMA_CYCLIC, mask); 200 201 /* 202 * The Back-End device might have already requested a DMA channel, 203 * so try to reuse it first, and then request a new one upon NULL. 204 */ 205 component_be = snd_soc_lookup_component_nolocked(dev_be, SND_DMAENGINE_PCM_DRV_NAME); 206 if (component_be) { 207 be_chan = soc_component_to_pcm(component_be)->chan[substream->stream]; 208 tmp_chan = be_chan; 209 } 210 if (!tmp_chan) 211 tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx"); 212 213 /* 214 * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each 215 * peripheral, unlike SDMA channel that is allocated dynamically. So no 216 * need to configure dma_request and dma_request2, but get dma_chan of 217 * Back-End device directly via dma_request_slave_channel. 218 */ 219 if (!asrc->use_edma) { 220 /* Get DMA request of Back-End */ 221 tmp_data = tmp_chan->private; 222 pair->dma_data.dma_request = tmp_data->dma_request; 223 if (!be_chan) 224 dma_release_channel(tmp_chan); 225 226 /* Get DMA request of Front-End */ 227 tmp_chan = asrc->get_dma_channel(pair, dir); 228 tmp_data = tmp_chan->private; 229 pair->dma_data.dma_request2 = tmp_data->dma_request; 230 pair->dma_data.peripheral_type = tmp_data->peripheral_type; 231 pair->dma_data.priority = tmp_data->priority; 232 dma_release_channel(tmp_chan); 233 234 pair->dma_chan[dir] = 235 dma_request_channel(mask, filter, &pair->dma_data); 236 pair->req_dma_chan = true; 237 } else { 238 pair->dma_chan[dir] = tmp_chan; 239 /* Do not flag to release if we are reusing the Back-End one */ 240 pair->req_dma_chan = !be_chan; 241 } 242 243 if (!pair->dma_chan[dir]) { 244 dev_err(dev, "failed to request DMA channel for Back-End\n"); 245 return -EINVAL; 246 } 247 248 width = snd_pcm_format_physical_width(asrc->asrc_format); 249 if (width < 8 || width > 64) 250 return -EINVAL; 251 else if (width == 8) 252 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; 253 else if (width == 16) 254 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; 255 else if (width == 24) 256 buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES; 257 else if (width <= 32) 258 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; 259 else 260 buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES; 261 262 config_be.direction = DMA_DEV_TO_DEV; 263 config_be.src_addr_width = buswidth; 264 config_be.src_maxburst = dma_params_be->maxburst; 265 config_be.dst_addr_width = buswidth; 266 config_be.dst_maxburst = dma_params_be->maxburst; 267 268 if (tx) { 269 config_be.src_addr = asrc->paddr + asrc->get_fifo_addr(OUT, index); 270 config_be.dst_addr = dma_params_be->addr; 271 } else { 272 config_be.dst_addr = asrc->paddr + asrc->get_fifo_addr(IN, index); 273 config_be.src_addr = dma_params_be->addr; 274 } 275 276 ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be); 277 if (ret) { 278 dev_err(dev, "failed to config DMA channel for Back-End\n"); 279 if (pair->req_dma_chan) 280 dma_release_channel(pair->dma_chan[dir]); 281 return ret; 282 } 283 284 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 285 286 return 0; 287 } 288 289 static int fsl_asrc_dma_hw_free(struct snd_soc_component *component, 290 struct snd_pcm_substream *substream) 291 { 292 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 293 struct snd_pcm_runtime *runtime = substream->runtime; 294 struct fsl_asrc_pair *pair = runtime->private_data; 295 u8 dir = tx ? OUT : IN; 296 297 snd_pcm_set_runtime_buffer(substream, NULL); 298 299 if (pair->dma_chan[!dir]) 300 dma_release_channel(pair->dma_chan[!dir]); 301 302 /* release dev_to_dev chan if we aren't reusing the Back-End one */ 303 if (pair->dma_chan[dir] && pair->req_dma_chan) 304 dma_release_channel(pair->dma_chan[dir]); 305 306 pair->dma_chan[!dir] = NULL; 307 pair->dma_chan[dir] = NULL; 308 309 return 0; 310 } 311 312 static int fsl_asrc_dma_startup(struct snd_soc_component *component, 313 struct snd_pcm_substream *substream) 314 { 315 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 316 struct snd_soc_pcm_runtime *rtd = substream->private_data; 317 struct snd_pcm_runtime *runtime = substream->runtime; 318 struct snd_dmaengine_dai_dma_data *dma_data; 319 struct device *dev = component->dev; 320 struct fsl_asrc *asrc = dev_get_drvdata(dev); 321 struct fsl_asrc_pair *pair; 322 struct dma_chan *tmp_chan = NULL; 323 u8 dir = tx ? OUT : IN; 324 bool release_pair = true; 325 int ret = 0; 326 327 ret = snd_pcm_hw_constraint_integer(substream->runtime, 328 SNDRV_PCM_HW_PARAM_PERIODS); 329 if (ret < 0) { 330 dev_err(dev, "failed to set pcm hw params periods\n"); 331 return ret; 332 } 333 334 pair = kzalloc(sizeof(*pair) + asrc->pair_priv_size, GFP_KERNEL); 335 if (!pair) 336 return -ENOMEM; 337 338 pair->asrc = asrc; 339 pair->private = (void *)pair + sizeof(struct fsl_asrc_pair); 340 341 runtime->private_data = pair; 342 343 /* Request a dummy pair, which will be released later. 344 * Request pair function needs channel num as input, for this 345 * dummy pair, we just request "1" channel temporarily. 346 */ 347 ret = asrc->request_pair(1, pair); 348 if (ret < 0) { 349 dev_err(dev, "failed to request asrc pair\n"); 350 goto req_pair_err; 351 } 352 353 /* Request a dummy dma channel, which will be released later. */ 354 tmp_chan = asrc->get_dma_channel(pair, dir); 355 if (!tmp_chan) { 356 dev_err(dev, "failed to get dma channel\n"); 357 ret = -EINVAL; 358 goto dma_chan_err; 359 } 360 361 dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); 362 363 /* Refine the snd_imx_hardware according to caps of DMA. */ 364 ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream, 365 dma_data, 366 &snd_imx_hardware, 367 tmp_chan); 368 if (ret < 0) { 369 dev_err(dev, "failed to refine runtime hwparams\n"); 370 goto out; 371 } 372 373 release_pair = false; 374 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 375 376 out: 377 dma_release_channel(tmp_chan); 378 379 dma_chan_err: 380 asrc->release_pair(pair); 381 382 req_pair_err: 383 if (release_pair) 384 kfree(pair); 385 386 return ret; 387 } 388 389 static int fsl_asrc_dma_shutdown(struct snd_soc_component *component, 390 struct snd_pcm_substream *substream) 391 { 392 struct snd_pcm_runtime *runtime = substream->runtime; 393 struct fsl_asrc_pair *pair = runtime->private_data; 394 struct fsl_asrc *asrc; 395 396 if (!pair) 397 return 0; 398 399 asrc = pair->asrc; 400 401 if (asrc->pair[pair->index] == pair) 402 asrc->pair[pair->index] = NULL; 403 404 kfree(pair); 405 406 return 0; 407 } 408 409 static snd_pcm_uframes_t 410 fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component, 411 struct snd_pcm_substream *substream) 412 { 413 struct snd_pcm_runtime *runtime = substream->runtime; 414 struct fsl_asrc_pair *pair = runtime->private_data; 415 416 return bytes_to_frames(substream->runtime, pair->pos); 417 } 418 419 static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component, 420 struct snd_soc_pcm_runtime *rtd) 421 { 422 struct snd_card *card = rtd->card->snd_card; 423 struct snd_pcm_substream *substream; 424 struct snd_pcm *pcm = rtd->pcm; 425 int ret, i; 426 427 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 428 if (ret) { 429 dev_err(card->dev, "failed to set DMA mask\n"); 430 return ret; 431 } 432 433 for_each_pcm_streams(i) { 434 substream = pcm->streams[i].substream; 435 if (!substream) 436 continue; 437 438 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, 439 FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer); 440 if (ret) { 441 dev_err(card->dev, "failed to allocate DMA buffer\n"); 442 goto err; 443 } 444 } 445 446 return 0; 447 448 err: 449 if (--i == 0 && pcm->streams[i].substream) 450 snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer); 451 452 return ret; 453 } 454 455 static void fsl_asrc_dma_pcm_free(struct snd_soc_component *component, 456 struct snd_pcm *pcm) 457 { 458 struct snd_pcm_substream *substream; 459 int i; 460 461 for_each_pcm_streams(i) { 462 substream = pcm->streams[i].substream; 463 if (!substream) 464 continue; 465 466 snd_dma_free_pages(&substream->dma_buffer); 467 substream->dma_buffer.area = NULL; 468 substream->dma_buffer.addr = 0; 469 } 470 } 471 472 struct snd_soc_component_driver fsl_asrc_component = { 473 .name = DRV_NAME, 474 .hw_params = fsl_asrc_dma_hw_params, 475 .hw_free = fsl_asrc_dma_hw_free, 476 .trigger = fsl_asrc_dma_trigger, 477 .open = fsl_asrc_dma_startup, 478 .close = fsl_asrc_dma_shutdown, 479 .pointer = fsl_asrc_dma_pcm_pointer, 480 .pcm_construct = fsl_asrc_dma_pcm_new, 481 .pcm_destruct = fsl_asrc_dma_pcm_free, 482 }; 483 EXPORT_SYMBOL_GPL(fsl_asrc_component); 484