1 // SPDX-License-Identifier: GPL-2.0
3 // Freescale ASRC ALSA SoC Platform (DMA) driver
5 // Copyright (C) 2014 Freescale Semiconductor, Inc.
7 // Author: Nicolin Chen <nicoleotsuka@gmail.com>
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>
15 #include "fsl_asrc_common.h"
17 #define FSL_ASRC_DMABUF_SIZE (256 * 1024)
19 static struct snd_pcm_hardware snd_imx_hardware = {
20 .info = SNDRV_PCM_INFO_INTERLEAVED |
21 SNDRV_PCM_INFO_BLOCK_TRANSFER |
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 */
32 static bool filter(struct dma_chan *chan, void *param)
34 if (!imx_dma_is_general_purpose(chan))
37 chan->private = param;
42 static void fsl_asrc_dma_complete(void *arg)
44 struct snd_pcm_substream *substream = arg;
45 struct snd_pcm_runtime *runtime = substream->runtime;
46 struct fsl_asrc_pair *pair = runtime->private_data;
48 pair->pos += snd_pcm_lib_period_bytes(substream);
49 if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
52 snd_pcm_period_elapsed(substream);
55 static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream,
56 struct snd_soc_component *component)
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;
64 /* Prepare and submit Front-End DMA channel */
65 if (!substream->runtime->no_period_wakeup)
66 flags |= DMA_PREP_INTERRUPT;
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");
79 pair->desc[!dir]->callback = fsl_asrc_dma_complete;
80 pair->desc[!dir]->callback_param = substream;
82 dmaengine_submit(pair->desc[!dir]);
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");
92 dmaengine_submit(pair->desc[dir]);
97 static int fsl_asrc_dma_trigger(struct snd_soc_component *component,
98 struct snd_pcm_substream *substream, int cmd)
100 struct snd_pcm_runtime *runtime = substream->runtime;
101 struct fsl_asrc_pair *pair = runtime->private_data;
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);
111 dma_async_issue_pending(pair->dma_chan[IN]);
112 dma_async_issue_pending(pair->dma_chan[OUT]);
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]);
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)
131 enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
132 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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 struct device_node *of_dma_node;
145 int stream = substream->stream;
146 struct imx_dma_data *tmp_data;
147 struct snd_soc_dpcm *dpcm;
148 struct device *dev_be;
149 u8 dir = tx ? OUT : IN;
153 /* Fetch the Back-End dma_data from DPCM */
154 for_each_dpcm_be(rtd, stream, dpcm) {
155 struct snd_soc_pcm_runtime *be = dpcm->be;
156 struct snd_pcm_substream *substream_be;
157 struct snd_soc_dai *dai = asoc_rtd_to_cpu(be, 0);
162 substream_be = snd_soc_dpcm_get_substream(be, stream);
163 dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be);
168 if (!dma_params_be) {
169 dev_err(dev, "failed to get the substream of Back-End\n");
173 /* Override dma_data of the Front-End and config its dmaengine */
174 dma_params_fe = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
175 dma_params_fe->addr = asrc->paddr + asrc->get_fifo_addr(!dir, index);
176 dma_params_fe->maxburst = dma_params_be->maxburst;
178 pair->dma_chan[!dir] = asrc->get_dma_channel(pair, !dir);
179 if (!pair->dma_chan[!dir]) {
180 dev_err(dev, "failed to request DMA channel\n");
184 memset(&config_fe, 0, sizeof(config_fe));
185 ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe);
187 dev_err(dev, "failed to prepare DMA config for Front-End\n");
191 ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe);
193 dev_err(dev, "failed to config DMA channel for Front-End\n");
197 /* Request and config DMA channel for Back-End */
199 dma_cap_set(DMA_SLAVE, mask);
200 dma_cap_set(DMA_CYCLIC, mask);
203 * The Back-End device might have already requested a DMA channel,
204 * so try to reuse it first, and then request a new one upon NULL.
206 component_be = snd_soc_lookup_component_nolocked(dev_be, SND_DMAENGINE_PCM_DRV_NAME);
208 be_chan = soc_component_to_pcm(component_be)->chan[substream->stream];
212 tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
215 * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each
216 * peripheral, unlike SDMA channel that is allocated dynamically. So no
217 * need to configure dma_request and dma_request2, but get dma_chan of
218 * Back-End device directly via dma_request_slave_channel.
220 if (!asrc->use_edma) {
221 /* Get DMA request of Back-End */
222 tmp_data = tmp_chan->private;
223 pair->dma_data.dma_request = tmp_data->dma_request;
225 dma_release_channel(tmp_chan);
227 /* Get DMA request of Front-End */
228 tmp_chan = asrc->get_dma_channel(pair, dir);
229 tmp_data = tmp_chan->private;
230 pair->dma_data.dma_request2 = tmp_data->dma_request;
231 pair->dma_data.peripheral_type = tmp_data->peripheral_type;
232 pair->dma_data.priority = tmp_data->priority;
233 dma_release_channel(tmp_chan);
235 of_dma_node = pair->dma_chan[!dir]->device->dev->of_node;
236 pair->dma_chan[dir] =
237 __dma_request_channel(&mask, filter, &pair->dma_data,
239 pair->req_dma_chan = true;
241 pair->dma_chan[dir] = tmp_chan;
242 /* Do not flag to release if we are reusing the Back-End one */
243 pair->req_dma_chan = !be_chan;
246 if (!pair->dma_chan[dir]) {
247 dev_err(dev, "failed to request DMA channel for Back-End\n");
251 width = snd_pcm_format_physical_width(asrc->asrc_format);
252 if (width < 8 || width > 64)
255 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
256 else if (width == 16)
257 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
258 else if (width == 24)
259 buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES;
260 else if (width <= 32)
261 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
263 buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES;
265 config_be.direction = DMA_DEV_TO_DEV;
266 config_be.src_addr_width = buswidth;
267 config_be.src_maxburst = dma_params_be->maxburst;
268 config_be.dst_addr_width = buswidth;
269 config_be.dst_maxburst = dma_params_be->maxburst;
272 config_be.src_addr = asrc->paddr + asrc->get_fifo_addr(OUT, index);
273 config_be.dst_addr = dma_params_be->addr;
275 config_be.dst_addr = asrc->paddr + asrc->get_fifo_addr(IN, index);
276 config_be.src_addr = dma_params_be->addr;
279 ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
281 dev_err(dev, "failed to config DMA channel for Back-End\n");
282 if (pair->req_dma_chan)
283 dma_release_channel(pair->dma_chan[dir]);
287 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
292 static int fsl_asrc_dma_hw_free(struct snd_soc_component *component,
293 struct snd_pcm_substream *substream)
295 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
296 struct snd_pcm_runtime *runtime = substream->runtime;
297 struct fsl_asrc_pair *pair = runtime->private_data;
298 u8 dir = tx ? OUT : IN;
300 snd_pcm_set_runtime_buffer(substream, NULL);
302 if (pair->dma_chan[!dir])
303 dma_release_channel(pair->dma_chan[!dir]);
305 /* release dev_to_dev chan if we aren't reusing the Back-End one */
306 if (pair->dma_chan[dir] && pair->req_dma_chan)
307 dma_release_channel(pair->dma_chan[dir]);
309 pair->dma_chan[!dir] = NULL;
310 pair->dma_chan[dir] = NULL;
315 static int fsl_asrc_dma_startup(struct snd_soc_component *component,
316 struct snd_pcm_substream *substream)
318 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
319 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
320 struct snd_pcm_runtime *runtime = substream->runtime;
321 struct snd_dmaengine_dai_dma_data *dma_data;
322 struct device *dev = component->dev;
323 struct fsl_asrc *asrc = dev_get_drvdata(dev);
324 struct fsl_asrc_pair *pair;
325 struct dma_chan *tmp_chan = NULL;
326 u8 dir = tx ? OUT : IN;
327 bool release_pair = true;
330 ret = snd_pcm_hw_constraint_integer(substream->runtime,
331 SNDRV_PCM_HW_PARAM_PERIODS);
333 dev_err(dev, "failed to set pcm hw params periods\n");
337 pair = kzalloc(sizeof(*pair) + asrc->pair_priv_size, GFP_KERNEL);
342 pair->private = (void *)pair + sizeof(struct fsl_asrc_pair);
344 runtime->private_data = pair;
346 /* Request a dummy pair, which will be released later.
347 * Request pair function needs channel num as input, for this
348 * dummy pair, we just request "1" channel temporarily.
350 ret = asrc->request_pair(1, pair);
352 dev_err(dev, "failed to request asrc pair\n");
356 /* Request a dummy dma channel, which will be released later. */
357 tmp_chan = asrc->get_dma_channel(pair, dir);
359 dev_err(dev, "failed to get dma channel\n");
364 dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
366 /* Refine the snd_imx_hardware according to caps of DMA. */
367 ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream,
372 dev_err(dev, "failed to refine runtime hwparams\n");
376 release_pair = false;
377 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
380 dma_release_channel(tmp_chan);
383 asrc->release_pair(pair);
392 static int fsl_asrc_dma_shutdown(struct snd_soc_component *component,
393 struct snd_pcm_substream *substream)
395 struct snd_pcm_runtime *runtime = substream->runtime;
396 struct fsl_asrc_pair *pair = runtime->private_data;
397 struct fsl_asrc *asrc;
404 if (asrc->pair[pair->index] == pair)
405 asrc->pair[pair->index] = NULL;
412 static snd_pcm_uframes_t
413 fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component,
414 struct snd_pcm_substream *substream)
416 struct snd_pcm_runtime *runtime = substream->runtime;
417 struct fsl_asrc_pair *pair = runtime->private_data;
419 return bytes_to_frames(substream->runtime, pair->pos);
422 static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component,
423 struct snd_soc_pcm_runtime *rtd)
425 struct snd_card *card = rtd->card->snd_card;
426 struct snd_pcm_substream *substream;
427 struct snd_pcm *pcm = rtd->pcm;
430 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
432 dev_err(card->dev, "failed to set DMA mask\n");
436 for_each_pcm_streams(i) {
437 substream = pcm->streams[i].substream;
441 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
442 FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
444 dev_err(card->dev, "failed to allocate DMA buffer\n");
452 if (--i == 0 && pcm->streams[i].substream)
453 snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
458 static void fsl_asrc_dma_pcm_free(struct snd_soc_component *component,
461 struct snd_pcm_substream *substream;
464 for_each_pcm_streams(i) {
465 substream = pcm->streams[i].substream;
469 snd_dma_free_pages(&substream->dma_buffer);
470 substream->dma_buffer.area = NULL;
471 substream->dma_buffer.addr = 0;
475 struct snd_soc_component_driver fsl_asrc_component = {
477 .hw_params = fsl_asrc_dma_hw_params,
478 .hw_free = fsl_asrc_dma_hw_free,
479 .trigger = fsl_asrc_dma_trigger,
480 .open = fsl_asrc_dma_startup,
481 .close = fsl_asrc_dma_shutdown,
482 .pointer = fsl_asrc_dma_pcm_pointer,
483 .pcm_construct = fsl_asrc_dma_pcm_new,
484 .pcm_destruct = fsl_asrc_dma_pcm_free,
486 EXPORT_SYMBOL_GPL(fsl_asrc_component);