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/dma/imx-dma.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_async(pair->dma_chan[OUT]); 118 dmaengine_terminate_async(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 enum sdma_peripheral_type be_peripheral_type = IMX_DMATYPE_SSI; 133 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 134 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 135 struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL; 136 struct snd_dmaengine_dai_dma_data *dma_params_be = NULL; 137 struct snd_pcm_runtime *runtime = substream->runtime; 138 struct fsl_asrc_pair *pair = runtime->private_data; 139 struct dma_chan *tmp_chan = NULL, *be_chan = NULL; 140 struct snd_soc_component *component_be = NULL; 141 struct fsl_asrc *asrc = pair->asrc; 142 struct dma_slave_config config_fe = {}, config_be = {}; 143 struct sdma_peripheral_config audio_config; 144 enum asrc_pair_index index = pair->index; 145 struct device *dev = component->dev; 146 struct device_node *of_dma_node; 147 int stream = substream->stream; 148 struct imx_dma_data *tmp_data; 149 struct snd_soc_dpcm *dpcm; 150 struct device *dev_be; 151 u8 dir = tx ? OUT : IN; 152 dma_cap_mask_t mask; 153 int ret, width; 154 155 /* Fetch the Back-End dma_data from DPCM */ 156 for_each_dpcm_be(rtd, stream, dpcm) { 157 struct snd_soc_pcm_runtime *be = dpcm->be; 158 struct snd_pcm_substream *substream_be; 159 struct snd_soc_dai *dai = asoc_rtd_to_cpu(be, 0); 160 161 if (dpcm->fe != rtd) 162 continue; 163 164 substream_be = snd_soc_dpcm_get_substream(be, stream); 165 dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be); 166 dev_be = dai->dev; 167 break; 168 } 169 170 if (!dma_params_be) { 171 dev_err(dev, "failed to get the substream of Back-End\n"); 172 return -EINVAL; 173 } 174 175 /* Override dma_data of the Front-End and config its dmaengine */ 176 dma_params_fe = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); 177 dma_params_fe->addr = asrc->paddr + asrc->get_fifo_addr(!dir, index); 178 dma_params_fe->maxburst = dma_params_be->maxburst; 179 180 pair->dma_chan[!dir] = asrc->get_dma_channel(pair, !dir); 181 if (!pair->dma_chan[!dir]) { 182 dev_err(dev, "failed to request DMA channel\n"); 183 return -EINVAL; 184 } 185 186 ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe); 187 if (ret) { 188 dev_err(dev, "failed to prepare DMA config for Front-End\n"); 189 return ret; 190 } 191 192 ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe); 193 if (ret) { 194 dev_err(dev, "failed to config DMA channel for Front-End\n"); 195 return ret; 196 } 197 198 /* Request and config DMA channel for Back-End */ 199 dma_cap_zero(mask); 200 dma_cap_set(DMA_SLAVE, mask); 201 dma_cap_set(DMA_CYCLIC, mask); 202 203 /* 204 * The Back-End device might have already requested a DMA channel, 205 * so try to reuse it first, and then request a new one upon NULL. 206 */ 207 component_be = snd_soc_lookup_component_nolocked(dev_be, SND_DMAENGINE_PCM_DRV_NAME); 208 if (component_be) { 209 be_chan = soc_component_to_pcm(component_be)->chan[substream->stream]; 210 tmp_chan = be_chan; 211 } 212 if (!tmp_chan) { 213 tmp_chan = dma_request_chan(dev_be, tx ? "tx" : "rx"); 214 if (IS_ERR(tmp_chan)) { 215 dev_err(dev, "failed to request DMA channel for Back-End\n"); 216 return -EINVAL; 217 } 218 } 219 220 /* 221 * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each 222 * peripheral, unlike SDMA channel that is allocated dynamically. So no 223 * need to configure dma_request and dma_request2, but get dma_chan of 224 * Back-End device directly via dma_request_chan. 225 */ 226 if (!asrc->use_edma) { 227 /* Get DMA request of Back-End */ 228 tmp_data = tmp_chan->private; 229 pair->dma_data.dma_request = tmp_data->dma_request; 230 be_peripheral_type = tmp_data->peripheral_type; 231 if (!be_chan) 232 dma_release_channel(tmp_chan); 233 234 /* Get DMA request of Front-End */ 235 tmp_chan = asrc->get_dma_channel(pair, dir); 236 tmp_data = tmp_chan->private; 237 pair->dma_data.dma_request2 = tmp_data->dma_request; 238 pair->dma_data.peripheral_type = tmp_data->peripheral_type; 239 pair->dma_data.priority = tmp_data->priority; 240 dma_release_channel(tmp_chan); 241 242 of_dma_node = pair->dma_chan[!dir]->device->dev->of_node; 243 pair->dma_chan[dir] = 244 __dma_request_channel(&mask, filter, &pair->dma_data, 245 of_dma_node); 246 pair->req_dma_chan = true; 247 } else { 248 pair->dma_chan[dir] = tmp_chan; 249 /* Do not flag to release if we are reusing the Back-End one */ 250 pair->req_dma_chan = !be_chan; 251 } 252 253 if (!pair->dma_chan[dir]) { 254 dev_err(dev, "failed to request DMA channel for Back-End\n"); 255 return -EINVAL; 256 } 257 258 width = snd_pcm_format_physical_width(asrc->asrc_format); 259 if (width < 8 || width > 64) 260 return -EINVAL; 261 else if (width == 8) 262 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; 263 else if (width == 16) 264 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; 265 else if (width == 24) 266 buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES; 267 else if (width <= 32) 268 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; 269 else 270 buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES; 271 272 config_be.direction = DMA_DEV_TO_DEV; 273 config_be.src_addr_width = buswidth; 274 config_be.src_maxburst = dma_params_be->maxburst; 275 config_be.dst_addr_width = buswidth; 276 config_be.dst_maxburst = dma_params_be->maxburst; 277 278 memset(&audio_config, 0, sizeof(audio_config)); 279 config_be.peripheral_config = &audio_config; 280 config_be.peripheral_size = sizeof(audio_config); 281 282 if (tx && (be_peripheral_type == IMX_DMATYPE_SSI_DUAL || 283 be_peripheral_type == IMX_DMATYPE_SPDIF)) 284 audio_config.n_fifos_dst = 2; 285 if (!tx && (be_peripheral_type == IMX_DMATYPE_SSI_DUAL || 286 be_peripheral_type == IMX_DMATYPE_SPDIF)) 287 audio_config.n_fifos_src = 2; 288 289 if (tx) { 290 config_be.src_addr = asrc->paddr + asrc->get_fifo_addr(OUT, index); 291 config_be.dst_addr = dma_params_be->addr; 292 } else { 293 config_be.dst_addr = asrc->paddr + asrc->get_fifo_addr(IN, index); 294 config_be.src_addr = dma_params_be->addr; 295 } 296 297 ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be); 298 if (ret) { 299 dev_err(dev, "failed to config DMA channel for Back-End\n"); 300 if (pair->req_dma_chan) 301 dma_release_channel(pair->dma_chan[dir]); 302 return ret; 303 } 304 305 return 0; 306 } 307 308 static int fsl_asrc_dma_hw_free(struct snd_soc_component *component, 309 struct snd_pcm_substream *substream) 310 { 311 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 312 struct snd_pcm_runtime *runtime = substream->runtime; 313 struct fsl_asrc_pair *pair = runtime->private_data; 314 u8 dir = tx ? OUT : IN; 315 316 if (pair->dma_chan[!dir]) 317 dma_release_channel(pair->dma_chan[!dir]); 318 319 /* release dev_to_dev chan if we aren't reusing the Back-End one */ 320 if (pair->dma_chan[dir] && pair->req_dma_chan) 321 dma_release_channel(pair->dma_chan[dir]); 322 323 pair->dma_chan[!dir] = NULL; 324 pair->dma_chan[dir] = NULL; 325 326 return 0; 327 } 328 329 static int fsl_asrc_dma_startup(struct snd_soc_component *component, 330 struct snd_pcm_substream *substream) 331 { 332 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 333 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 334 struct snd_pcm_runtime *runtime = substream->runtime; 335 struct snd_dmaengine_dai_dma_data *dma_data; 336 struct device *dev = component->dev; 337 struct fsl_asrc *asrc = dev_get_drvdata(dev); 338 struct fsl_asrc_pair *pair; 339 struct dma_chan *tmp_chan = NULL; 340 u8 dir = tx ? OUT : IN; 341 bool release_pair = true; 342 int ret = 0; 343 344 ret = snd_pcm_hw_constraint_integer(substream->runtime, 345 SNDRV_PCM_HW_PARAM_PERIODS); 346 if (ret < 0) { 347 dev_err(dev, "failed to set pcm hw params periods\n"); 348 return ret; 349 } 350 351 pair = kzalloc(sizeof(*pair) + asrc->pair_priv_size, GFP_KERNEL); 352 if (!pair) 353 return -ENOMEM; 354 355 pair->asrc = asrc; 356 pair->private = (void *)pair + sizeof(struct fsl_asrc_pair); 357 358 runtime->private_data = pair; 359 360 /* Request a dummy pair, which will be released later. 361 * Request pair function needs channel num as input, for this 362 * dummy pair, we just request "1" channel temporarily. 363 */ 364 ret = asrc->request_pair(1, pair); 365 if (ret < 0) { 366 dev_err(dev, "failed to request asrc pair\n"); 367 goto req_pair_err; 368 } 369 370 /* Request a dummy dma channel, which will be released later. */ 371 tmp_chan = asrc->get_dma_channel(pair, dir); 372 if (!tmp_chan) { 373 dev_err(dev, "failed to get dma channel\n"); 374 ret = -EINVAL; 375 goto dma_chan_err; 376 } 377 378 dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); 379 380 /* Refine the snd_imx_hardware according to caps of DMA. */ 381 ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream, 382 dma_data, 383 &snd_imx_hardware, 384 tmp_chan); 385 if (ret < 0) { 386 dev_err(dev, "failed to refine runtime hwparams\n"); 387 goto out; 388 } 389 390 release_pair = false; 391 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 392 393 out: 394 dma_release_channel(tmp_chan); 395 396 dma_chan_err: 397 asrc->release_pair(pair); 398 399 req_pair_err: 400 if (release_pair) 401 kfree(pair); 402 403 return ret; 404 } 405 406 static int fsl_asrc_dma_shutdown(struct snd_soc_component *component, 407 struct snd_pcm_substream *substream) 408 { 409 struct snd_pcm_runtime *runtime = substream->runtime; 410 struct fsl_asrc_pair *pair = runtime->private_data; 411 struct fsl_asrc *asrc; 412 413 if (!pair) 414 return 0; 415 416 asrc = pair->asrc; 417 418 if (asrc->pair[pair->index] == pair) 419 asrc->pair[pair->index] = NULL; 420 421 kfree(pair); 422 423 return 0; 424 } 425 426 static snd_pcm_uframes_t 427 fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component, 428 struct snd_pcm_substream *substream) 429 { 430 struct snd_pcm_runtime *runtime = substream->runtime; 431 struct fsl_asrc_pair *pair = runtime->private_data; 432 433 return bytes_to_frames(substream->runtime, pair->pos); 434 } 435 436 static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component, 437 struct snd_soc_pcm_runtime *rtd) 438 { 439 struct snd_card *card = rtd->card->snd_card; 440 struct snd_pcm *pcm = rtd->pcm; 441 int ret; 442 443 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 444 if (ret) { 445 dev_err(card->dev, "failed to set DMA mask\n"); 446 return ret; 447 } 448 449 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, 450 card->dev, FSL_ASRC_DMABUF_SIZE); 451 } 452 453 struct snd_soc_component_driver fsl_asrc_component = { 454 .name = DRV_NAME, 455 .hw_params = fsl_asrc_dma_hw_params, 456 .hw_free = fsl_asrc_dma_hw_free, 457 .trigger = fsl_asrc_dma_trigger, 458 .open = fsl_asrc_dma_startup, 459 .close = fsl_asrc_dma_shutdown, 460 .pointer = fsl_asrc_dma_pcm_pointer, 461 .pcm_construct = fsl_asrc_dma_pcm_new, 462 .legacy_dai_naming = 1, 463 }; 464 EXPORT_SYMBOL_GPL(fsl_asrc_component); 465