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.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 fsl_asrc *asrc = pair->asrc; 139 struct dma_slave_config config_fe, config_be; 140 enum asrc_pair_index index = pair->index; 141 struct device *dev = component->dev; 142 int stream = substream->stream; 143 struct imx_dma_data *tmp_data; 144 struct snd_soc_dpcm *dpcm; 145 struct dma_chan *tmp_chan; 146 struct device *dev_be; 147 u8 dir = tx ? OUT : IN; 148 dma_cap_mask_t mask; 149 int ret, width; 150 151 /* Fetch the Back-End dma_data from DPCM */ 152 for_each_dpcm_be(rtd, stream, dpcm) { 153 struct snd_soc_pcm_runtime *be = dpcm->be; 154 struct snd_pcm_substream *substream_be; 155 struct snd_soc_dai *dai = asoc_rtd_to_cpu(be, 0); 156 157 if (dpcm->fe != rtd) 158 continue; 159 160 substream_be = snd_soc_dpcm_get_substream(be, stream); 161 dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be); 162 dev_be = dai->dev; 163 break; 164 } 165 166 if (!dma_params_be) { 167 dev_err(dev, "failed to get the substream of Back-End\n"); 168 return -EINVAL; 169 } 170 171 /* Override dma_data of the Front-End and config its dmaengine */ 172 dma_params_fe = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); 173 dma_params_fe->addr = asrc->paddr + REG_ASRDx(!dir, index); 174 dma_params_fe->maxburst = dma_params_be->maxburst; 175 176 pair->dma_chan[!dir] = fsl_asrc_get_dma_channel(pair, !dir); 177 if (!pair->dma_chan[!dir]) { 178 dev_err(dev, "failed to request DMA channel\n"); 179 return -EINVAL; 180 } 181 182 memset(&config_fe, 0, sizeof(config_fe)); 183 ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe); 184 if (ret) { 185 dev_err(dev, "failed to prepare DMA config for Front-End\n"); 186 return ret; 187 } 188 189 ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe); 190 if (ret) { 191 dev_err(dev, "failed to config DMA channel for Front-End\n"); 192 return ret; 193 } 194 195 /* Request and config DMA channel for Back-End */ 196 dma_cap_zero(mask); 197 dma_cap_set(DMA_SLAVE, mask); 198 dma_cap_set(DMA_CYCLIC, mask); 199 200 /* 201 * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each 202 * peripheral, unlike SDMA channel that is allocated dynamically. So no 203 * need to configure dma_request and dma_request2, but get dma_chan via 204 * dma_request_slave_channel directly with dma name of Front-End device 205 */ 206 if (!asrc->soc->use_edma) { 207 /* Get DMA request of Back-End */ 208 tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx"); 209 tmp_data = tmp_chan->private; 210 pair->dma_data.dma_request = tmp_data->dma_request; 211 dma_release_channel(tmp_chan); 212 213 /* Get DMA request of Front-End */ 214 tmp_chan = fsl_asrc_get_dma_channel(pair, dir); 215 tmp_data = tmp_chan->private; 216 pair->dma_data.dma_request2 = tmp_data->dma_request; 217 pair->dma_data.peripheral_type = tmp_data->peripheral_type; 218 pair->dma_data.priority = tmp_data->priority; 219 dma_release_channel(tmp_chan); 220 221 pair->dma_chan[dir] = 222 dma_request_channel(mask, filter, &pair->dma_data); 223 } else { 224 pair->dma_chan[dir] = 225 fsl_asrc_get_dma_channel(pair, dir); 226 } 227 228 if (!pair->dma_chan[dir]) { 229 dev_err(dev, "failed to request DMA channel for Back-End\n"); 230 return -EINVAL; 231 } 232 233 width = snd_pcm_format_physical_width(asrc->asrc_format); 234 if (width < 8 || width > 64) 235 return -EINVAL; 236 else if (width == 8) 237 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; 238 else if (width == 16) 239 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; 240 else if (width == 24) 241 buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES; 242 else if (width <= 32) 243 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; 244 else 245 buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES; 246 247 config_be.direction = DMA_DEV_TO_DEV; 248 config_be.src_addr_width = buswidth; 249 config_be.src_maxburst = dma_params_be->maxburst; 250 config_be.dst_addr_width = buswidth; 251 config_be.dst_maxburst = dma_params_be->maxburst; 252 253 if (tx) { 254 config_be.src_addr = asrc->paddr + REG_ASRDO(index); 255 config_be.dst_addr = dma_params_be->addr; 256 } else { 257 config_be.dst_addr = asrc->paddr + REG_ASRDI(index); 258 config_be.src_addr = dma_params_be->addr; 259 } 260 261 ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be); 262 if (ret) { 263 dev_err(dev, "failed to config DMA channel for Back-End\n"); 264 return ret; 265 } 266 267 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 268 269 return 0; 270 } 271 272 static int fsl_asrc_dma_hw_free(struct snd_soc_component *component, 273 struct snd_pcm_substream *substream) 274 { 275 struct snd_pcm_runtime *runtime = substream->runtime; 276 struct fsl_asrc_pair *pair = runtime->private_data; 277 278 snd_pcm_set_runtime_buffer(substream, NULL); 279 280 if (pair->dma_chan[IN]) 281 dma_release_channel(pair->dma_chan[IN]); 282 283 if (pair->dma_chan[OUT]) 284 dma_release_channel(pair->dma_chan[OUT]); 285 286 pair->dma_chan[IN] = NULL; 287 pair->dma_chan[OUT] = NULL; 288 289 return 0; 290 } 291 292 static int fsl_asrc_dma_startup(struct snd_soc_component *component, 293 struct snd_pcm_substream *substream) 294 { 295 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 296 struct snd_soc_pcm_runtime *rtd = substream->private_data; 297 struct snd_pcm_runtime *runtime = substream->runtime; 298 struct snd_dmaengine_dai_dma_data *dma_data; 299 struct device *dev = component->dev; 300 struct fsl_asrc *asrc = dev_get_drvdata(dev); 301 struct fsl_asrc_pair *pair; 302 struct dma_chan *tmp_chan = NULL; 303 u8 dir = tx ? OUT : IN; 304 bool release_pair = true; 305 int ret = 0; 306 307 ret = snd_pcm_hw_constraint_integer(substream->runtime, 308 SNDRV_PCM_HW_PARAM_PERIODS); 309 if (ret < 0) { 310 dev_err(dev, "failed to set pcm hw params periods\n"); 311 return ret; 312 } 313 314 pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL); 315 if (!pair) 316 return -ENOMEM; 317 318 pair->asrc = asrc; 319 320 runtime->private_data = pair; 321 322 /* Request a dummy pair, which will be released later. 323 * Request pair function needs channel num as input, for this 324 * dummy pair, we just request "1" channel temporarily. 325 */ 326 ret = fsl_asrc_request_pair(1, pair); 327 if (ret < 0) { 328 dev_err(dev, "failed to request asrc pair\n"); 329 goto req_pair_err; 330 } 331 332 /* Request a dummy dma channel, which will be released later. */ 333 tmp_chan = fsl_asrc_get_dma_channel(pair, dir); 334 if (!tmp_chan) { 335 dev_err(dev, "failed to get dma channel\n"); 336 ret = -EINVAL; 337 goto dma_chan_err; 338 } 339 340 dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); 341 342 /* Refine the snd_imx_hardware according to caps of DMA. */ 343 ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream, 344 dma_data, 345 &snd_imx_hardware, 346 tmp_chan); 347 if (ret < 0) { 348 dev_err(dev, "failed to refine runtime hwparams\n"); 349 goto out; 350 } 351 352 release_pair = false; 353 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 354 355 out: 356 dma_release_channel(tmp_chan); 357 358 dma_chan_err: 359 fsl_asrc_release_pair(pair); 360 361 req_pair_err: 362 if (release_pair) 363 kfree(pair); 364 365 return ret; 366 } 367 368 static int fsl_asrc_dma_shutdown(struct snd_soc_component *component, 369 struct snd_pcm_substream *substream) 370 { 371 struct snd_pcm_runtime *runtime = substream->runtime; 372 struct fsl_asrc_pair *pair = runtime->private_data; 373 struct fsl_asrc *asrc; 374 375 if (!pair) 376 return 0; 377 378 asrc = pair->asrc; 379 380 if (asrc->pair[pair->index] == pair) 381 asrc->pair[pair->index] = NULL; 382 383 kfree(pair); 384 385 return 0; 386 } 387 388 static snd_pcm_uframes_t 389 fsl_asrc_dma_pcm_pointer(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; 394 395 return bytes_to_frames(substream->runtime, pair->pos); 396 } 397 398 static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component, 399 struct snd_soc_pcm_runtime *rtd) 400 { 401 struct snd_card *card = rtd->card->snd_card; 402 struct snd_pcm_substream *substream; 403 struct snd_pcm *pcm = rtd->pcm; 404 int ret, i; 405 406 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 407 if (ret) { 408 dev_err(card->dev, "failed to set DMA mask\n"); 409 return ret; 410 } 411 412 for_each_pcm_streams(i) { 413 substream = pcm->streams[i].substream; 414 if (!substream) 415 continue; 416 417 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev, 418 FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer); 419 if (ret) { 420 dev_err(card->dev, "failed to allocate DMA buffer\n"); 421 goto err; 422 } 423 } 424 425 return 0; 426 427 err: 428 if (--i == 0 && pcm->streams[i].substream) 429 snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer); 430 431 return ret; 432 } 433 434 static void fsl_asrc_dma_pcm_free(struct snd_soc_component *component, 435 struct snd_pcm *pcm) 436 { 437 struct snd_pcm_substream *substream; 438 int i; 439 440 for_each_pcm_streams(i) { 441 substream = pcm->streams[i].substream; 442 if (!substream) 443 continue; 444 445 snd_dma_free_pages(&substream->dma_buffer); 446 substream->dma_buffer.area = NULL; 447 substream->dma_buffer.addr = 0; 448 } 449 } 450 451 struct snd_soc_component_driver fsl_asrc_component = { 452 .name = DRV_NAME, 453 .hw_params = fsl_asrc_dma_hw_params, 454 .hw_free = fsl_asrc_dma_hw_free, 455 .trigger = fsl_asrc_dma_trigger, 456 .open = fsl_asrc_dma_startup, 457 .close = fsl_asrc_dma_shutdown, 458 .pointer = fsl_asrc_dma_pcm_pointer, 459 .pcm_construct = fsl_asrc_dma_pcm_new, 460 .pcm_destruct = fsl_asrc_dma_pcm_free, 461 }; 462 EXPORT_SYMBOL_GPL(fsl_asrc_component); 463