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_slave_channel(dev_be, tx ? "tx" : "rx"); 214 215 /* 216 * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each 217 * peripheral, unlike SDMA channel that is allocated dynamically. So no 218 * need to configure dma_request and dma_request2, but get dma_chan of 219 * Back-End device directly via dma_request_slave_channel. 220 */ 221 if (!asrc->use_edma) { 222 /* Get DMA request of Back-End */ 223 tmp_data = tmp_chan->private; 224 pair->dma_data.dma_request = tmp_data->dma_request; 225 be_peripheral_type = tmp_data->peripheral_type; 226 if (!be_chan) 227 dma_release_channel(tmp_chan); 228 229 /* Get DMA request of Front-End */ 230 tmp_chan = asrc->get_dma_channel(pair, dir); 231 tmp_data = tmp_chan->private; 232 pair->dma_data.dma_request2 = tmp_data->dma_request; 233 pair->dma_data.peripheral_type = tmp_data->peripheral_type; 234 pair->dma_data.priority = tmp_data->priority; 235 dma_release_channel(tmp_chan); 236 237 of_dma_node = pair->dma_chan[!dir]->device->dev->of_node; 238 pair->dma_chan[dir] = 239 __dma_request_channel(&mask, filter, &pair->dma_data, 240 of_dma_node); 241 pair->req_dma_chan = true; 242 } else { 243 pair->dma_chan[dir] = tmp_chan; 244 /* Do not flag to release if we are reusing the Back-End one */ 245 pair->req_dma_chan = !be_chan; 246 } 247 248 if (!pair->dma_chan[dir]) { 249 dev_err(dev, "failed to request DMA channel for Back-End\n"); 250 return -EINVAL; 251 } 252 253 width = snd_pcm_format_physical_width(asrc->asrc_format); 254 if (width < 8 || width > 64) 255 return -EINVAL; 256 else if (width == 8) 257 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; 258 else if (width == 16) 259 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; 260 else if (width == 24) 261 buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES; 262 else if (width <= 32) 263 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; 264 else 265 buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES; 266 267 config_be.direction = DMA_DEV_TO_DEV; 268 config_be.src_addr_width = buswidth; 269 config_be.src_maxburst = dma_params_be->maxburst; 270 config_be.dst_addr_width = buswidth; 271 config_be.dst_maxburst = dma_params_be->maxburst; 272 273 memset(&audio_config, 0, sizeof(audio_config)); 274 config_be.peripheral_config = &audio_config; 275 config_be.peripheral_size = sizeof(audio_config); 276 277 if (tx && (be_peripheral_type == IMX_DMATYPE_SSI_DUAL || 278 be_peripheral_type == IMX_DMATYPE_SPDIF)) 279 audio_config.n_fifos_dst = 2; 280 if (!tx && (be_peripheral_type == IMX_DMATYPE_SSI_DUAL || 281 be_peripheral_type == IMX_DMATYPE_SPDIF)) 282 audio_config.n_fifos_src = 2; 283 284 if (tx) { 285 config_be.src_addr = asrc->paddr + asrc->get_fifo_addr(OUT, index); 286 config_be.dst_addr = dma_params_be->addr; 287 } else { 288 config_be.dst_addr = asrc->paddr + asrc->get_fifo_addr(IN, index); 289 config_be.src_addr = dma_params_be->addr; 290 } 291 292 ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be); 293 if (ret) { 294 dev_err(dev, "failed to config DMA channel for Back-End\n"); 295 if (pair->req_dma_chan) 296 dma_release_channel(pair->dma_chan[dir]); 297 return ret; 298 } 299 300 return 0; 301 } 302 303 static int fsl_asrc_dma_hw_free(struct snd_soc_component *component, 304 struct snd_pcm_substream *substream) 305 { 306 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 307 struct snd_pcm_runtime *runtime = substream->runtime; 308 struct fsl_asrc_pair *pair = runtime->private_data; 309 u8 dir = tx ? OUT : IN; 310 311 if (pair->dma_chan[!dir]) 312 dma_release_channel(pair->dma_chan[!dir]); 313 314 /* release dev_to_dev chan if we aren't reusing the Back-End one */ 315 if (pair->dma_chan[dir] && pair->req_dma_chan) 316 dma_release_channel(pair->dma_chan[dir]); 317 318 pair->dma_chan[!dir] = NULL; 319 pair->dma_chan[dir] = NULL; 320 321 return 0; 322 } 323 324 static int fsl_asrc_dma_startup(struct snd_soc_component *component, 325 struct snd_pcm_substream *substream) 326 { 327 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 328 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 329 struct snd_pcm_runtime *runtime = substream->runtime; 330 struct snd_dmaengine_dai_dma_data *dma_data; 331 struct device *dev = component->dev; 332 struct fsl_asrc *asrc = dev_get_drvdata(dev); 333 struct fsl_asrc_pair *pair; 334 struct dma_chan *tmp_chan = NULL; 335 u8 dir = tx ? OUT : IN; 336 bool release_pair = true; 337 int ret = 0; 338 339 ret = snd_pcm_hw_constraint_integer(substream->runtime, 340 SNDRV_PCM_HW_PARAM_PERIODS); 341 if (ret < 0) { 342 dev_err(dev, "failed to set pcm hw params periods\n"); 343 return ret; 344 } 345 346 pair = kzalloc(sizeof(*pair) + asrc->pair_priv_size, GFP_KERNEL); 347 if (!pair) 348 return -ENOMEM; 349 350 pair->asrc = asrc; 351 pair->private = (void *)pair + sizeof(struct fsl_asrc_pair); 352 353 runtime->private_data = pair; 354 355 /* Request a dummy pair, which will be released later. 356 * Request pair function needs channel num as input, for this 357 * dummy pair, we just request "1" channel temporarily. 358 */ 359 ret = asrc->request_pair(1, pair); 360 if (ret < 0) { 361 dev_err(dev, "failed to request asrc pair\n"); 362 goto req_pair_err; 363 } 364 365 /* Request a dummy dma channel, which will be released later. */ 366 tmp_chan = asrc->get_dma_channel(pair, dir); 367 if (!tmp_chan) { 368 dev_err(dev, "failed to get dma channel\n"); 369 ret = -EINVAL; 370 goto dma_chan_err; 371 } 372 373 dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream); 374 375 /* Refine the snd_imx_hardware according to caps of DMA. */ 376 ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream, 377 dma_data, 378 &snd_imx_hardware, 379 tmp_chan); 380 if (ret < 0) { 381 dev_err(dev, "failed to refine runtime hwparams\n"); 382 goto out; 383 } 384 385 release_pair = false; 386 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 387 388 out: 389 dma_release_channel(tmp_chan); 390 391 dma_chan_err: 392 asrc->release_pair(pair); 393 394 req_pair_err: 395 if (release_pair) 396 kfree(pair); 397 398 return ret; 399 } 400 401 static int fsl_asrc_dma_shutdown(struct snd_soc_component *component, 402 struct snd_pcm_substream *substream) 403 { 404 struct snd_pcm_runtime *runtime = substream->runtime; 405 struct fsl_asrc_pair *pair = runtime->private_data; 406 struct fsl_asrc *asrc; 407 408 if (!pair) 409 return 0; 410 411 asrc = pair->asrc; 412 413 if (asrc->pair[pair->index] == pair) 414 asrc->pair[pair->index] = NULL; 415 416 kfree(pair); 417 418 return 0; 419 } 420 421 static snd_pcm_uframes_t 422 fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component, 423 struct snd_pcm_substream *substream) 424 { 425 struct snd_pcm_runtime *runtime = substream->runtime; 426 struct fsl_asrc_pair *pair = runtime->private_data; 427 428 return bytes_to_frames(substream->runtime, pair->pos); 429 } 430 431 static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component, 432 struct snd_soc_pcm_runtime *rtd) 433 { 434 struct snd_card *card = rtd->card->snd_card; 435 struct snd_pcm *pcm = rtd->pcm; 436 int ret; 437 438 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); 439 if (ret) { 440 dev_err(card->dev, "failed to set DMA mask\n"); 441 return ret; 442 } 443 444 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, 445 card->dev, FSL_ASRC_DMABUF_SIZE); 446 } 447 448 struct snd_soc_component_driver fsl_asrc_component = { 449 .name = DRV_NAME, 450 .hw_params = fsl_asrc_dma_hw_params, 451 .hw_free = fsl_asrc_dma_hw_free, 452 .trigger = fsl_asrc_dma_trigger, 453 .open = fsl_asrc_dma_startup, 454 .close = fsl_asrc_dma_shutdown, 455 .pointer = fsl_asrc_dma_pcm_pointer, 456 .pcm_construct = fsl_asrc_dma_pcm_new, 457 .legacy_dai_naming = 1, 458 }; 459 EXPORT_SYMBOL_GPL(fsl_asrc_component); 460