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1// SPDX-License-Identifier: GPL-2.02//3// Freescale ASRC ALSA SoC Platform (DMA) driver4//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 19static 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 32static 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 42static 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 55static 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 97static 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 127static 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 = snd_soc_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 = snd_soc_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(snd_soc_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 each222 * peripheral, unlike SDMA channel that is allocated dynamically. So no223 * need to configure dma_request and dma_request2, but get dma_chan of224 * 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 else270 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 308static 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 329static 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 = snd_soc_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 this362 * 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(snd_soc_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 393out:394 dma_release_channel(tmp_chan);395 396dma_chan_err:397 asrc->release_pair(pair);398 399req_pair_err:400 if (release_pair)401 kfree(pair);402 403 return ret;404}405 406static 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 426static snd_pcm_uframes_t427fsl_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 436static 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 453struct 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};464EXPORT_SYMBOL_GPL(fsl_asrc_component);465