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>
17 #define FSL_ASRC_DMABUF_SIZE (256 * 1024)
19 static const 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 SNDRV_PCM_INFO_PAUSE |
25 SNDRV_PCM_INFO_RESUME,
26 .buffer_bytes_max = FSL_ASRC_DMABUF_SIZE,
27 .period_bytes_min = 128,
28 .period_bytes_max = 65535, /* Limited by SDMA engine */
34 static bool filter(struct dma_chan *chan, void *param)
36 if (!imx_dma_is_general_purpose(chan))
39 chan->private = param;
44 static void fsl_asrc_dma_complete(void *arg)
46 struct snd_pcm_substream *substream = arg;
47 struct snd_pcm_runtime *runtime = substream->runtime;
48 struct fsl_asrc_pair *pair = runtime->private_data;
50 pair->pos += snd_pcm_lib_period_bytes(substream);
51 if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
54 snd_pcm_period_elapsed(substream);
57 static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream)
59 u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN;
60 struct snd_soc_pcm_runtime *rtd = substream->private_data;
61 struct snd_pcm_runtime *runtime = substream->runtime;
62 struct fsl_asrc_pair *pair = runtime->private_data;
63 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
64 struct device *dev = component->dev;
65 unsigned long flags = DMA_CTRL_ACK;
67 /* Prepare and submit Front-End DMA channel */
68 if (!substream->runtime->no_period_wakeup)
69 flags |= DMA_PREP_INTERRUPT;
72 pair->desc[!dir] = dmaengine_prep_dma_cyclic(
73 pair->dma_chan[!dir], runtime->dma_addr,
74 snd_pcm_lib_buffer_bytes(substream),
75 snd_pcm_lib_period_bytes(substream),
76 dir == OUT ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, flags);
77 if (!pair->desc[!dir]) {
78 dev_err(dev, "failed to prepare slave DMA for Front-End\n");
82 pair->desc[!dir]->callback = fsl_asrc_dma_complete;
83 pair->desc[!dir]->callback_param = substream;
85 dmaengine_submit(pair->desc[!dir]);
87 /* Prepare and submit Back-End DMA channel */
88 pair->desc[dir] = dmaengine_prep_dma_cyclic(
89 pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0);
90 if (!pair->desc[dir]) {
91 dev_err(dev, "failed to prepare slave DMA for Back-End\n");
95 dmaengine_submit(pair->desc[dir]);
100 static int fsl_asrc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
102 struct snd_pcm_runtime *runtime = substream->runtime;
103 struct fsl_asrc_pair *pair = runtime->private_data;
107 case SNDRV_PCM_TRIGGER_START:
108 case SNDRV_PCM_TRIGGER_RESUME:
109 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
110 ret = fsl_asrc_dma_prepare_and_submit(substream);
113 dma_async_issue_pending(pair->dma_chan[IN]);
114 dma_async_issue_pending(pair->dma_chan[OUT]);
116 case SNDRV_PCM_TRIGGER_STOP:
117 case SNDRV_PCM_TRIGGER_SUSPEND:
118 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
119 dmaengine_terminate_all(pair->dma_chan[OUT]);
120 dmaengine_terminate_all(pair->dma_chan[IN]);
129 static int fsl_asrc_dma_hw_params(struct snd_pcm_substream *substream,
130 struct snd_pcm_hw_params *params)
132 enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
133 struct snd_soc_pcm_runtime *rtd = substream->private_data;
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_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
138 struct snd_pcm_runtime *runtime = substream->runtime;
139 struct fsl_asrc_pair *pair = runtime->private_data;
140 struct fsl_asrc *asrc_priv = pair->asrc_priv;
141 struct dma_slave_config config_fe, config_be;
142 enum asrc_pair_index index = pair->index;
143 struct device *dev = component->dev;
144 int stream = substream->stream;
145 struct imx_dma_data *tmp_data;
146 struct snd_soc_dpcm *dpcm;
147 struct dma_chan *tmp_chan;
148 struct device *dev_be;
149 u8 dir = tx ? OUT : IN;
153 /* Fetch the Back-End dma_data from DPCM */
154 list_for_each_entry(dpcm, &rtd->dpcm[stream].be_clients, list_be) {
155 struct snd_soc_pcm_runtime *be = dpcm->be;
156 struct snd_pcm_substream *substream_be;
157 struct snd_soc_dai *dai = be->cpu_dai;
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(rtd->cpu_dai, substream);
175 dma_params_fe->addr = asrc_priv->paddr + REG_ASRDx(!dir, index);
176 dma_params_fe->maxburst = dma_params_be->maxburst;
178 pair->dma_chan[!dir] = fsl_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);
202 /* Get DMA request of Back-End */
203 tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
204 tmp_data = tmp_chan->private;
205 pair->dma_data.dma_request = tmp_data->dma_request;
206 dma_release_channel(tmp_chan);
208 /* Get DMA request of Front-End */
209 tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
210 tmp_data = tmp_chan->private;
211 pair->dma_data.dma_request2 = tmp_data->dma_request;
212 pair->dma_data.peripheral_type = tmp_data->peripheral_type;
213 pair->dma_data.priority = tmp_data->priority;
214 dma_release_channel(tmp_chan);
216 pair->dma_chan[dir] = dma_request_channel(mask, filter, &pair->dma_data);
217 if (!pair->dma_chan[dir]) {
218 dev_err(dev, "failed to request DMA channel for Back-End\n");
222 if (asrc_priv->asrc_width == 16)
223 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
225 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
227 config_be.direction = DMA_DEV_TO_DEV;
228 config_be.src_addr_width = buswidth;
229 config_be.src_maxburst = dma_params_be->maxburst;
230 config_be.dst_addr_width = buswidth;
231 config_be.dst_maxburst = dma_params_be->maxburst;
234 config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index);
235 config_be.dst_addr = dma_params_be->addr;
237 config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index);
238 config_be.src_addr = dma_params_be->addr;
241 ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
243 dev_err(dev, "failed to config DMA channel for Back-End\n");
244 dma_release_channel(pair->dma_chan[dir]);
248 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
253 static int fsl_asrc_dma_hw_free(struct snd_pcm_substream *substream)
255 struct snd_pcm_runtime *runtime = substream->runtime;
256 struct fsl_asrc_pair *pair = runtime->private_data;
258 snd_pcm_set_runtime_buffer(substream, NULL);
260 if (pair->dma_chan[IN])
261 dma_release_channel(pair->dma_chan[IN]);
263 if (pair->dma_chan[OUT])
264 dma_release_channel(pair->dma_chan[OUT]);
266 pair->dma_chan[IN] = NULL;
267 pair->dma_chan[OUT] = NULL;
272 static int fsl_asrc_dma_startup(struct snd_pcm_substream *substream)
274 struct snd_soc_pcm_runtime *rtd = substream->private_data;
275 struct snd_pcm_runtime *runtime = substream->runtime;
276 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
277 struct device *dev = component->dev;
278 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
279 struct fsl_asrc_pair *pair;
281 pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
285 pair->asrc_priv = asrc_priv;
287 runtime->private_data = pair;
289 snd_pcm_hw_constraint_integer(substream->runtime,
290 SNDRV_PCM_HW_PARAM_PERIODS);
291 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
296 static int fsl_asrc_dma_shutdown(struct snd_pcm_substream *substream)
298 struct snd_pcm_runtime *runtime = substream->runtime;
299 struct fsl_asrc_pair *pair = runtime->private_data;
300 struct fsl_asrc *asrc_priv;
305 asrc_priv = pair->asrc_priv;
307 if (asrc_priv->pair[pair->index] == pair)
308 asrc_priv->pair[pair->index] = NULL;
315 static snd_pcm_uframes_t fsl_asrc_dma_pcm_pointer(struct snd_pcm_substream *substream)
317 struct snd_pcm_runtime *runtime = substream->runtime;
318 struct fsl_asrc_pair *pair = runtime->private_data;
320 return bytes_to_frames(substream->runtime, pair->pos);
323 static const struct snd_pcm_ops fsl_asrc_dma_pcm_ops = {
324 .ioctl = snd_pcm_lib_ioctl,
325 .hw_params = fsl_asrc_dma_hw_params,
326 .hw_free = fsl_asrc_dma_hw_free,
327 .trigger = fsl_asrc_dma_trigger,
328 .open = fsl_asrc_dma_startup,
329 .close = fsl_asrc_dma_shutdown,
330 .pointer = fsl_asrc_dma_pcm_pointer,
333 static int fsl_asrc_dma_pcm_new(struct snd_soc_pcm_runtime *rtd)
335 struct snd_card *card = rtd->card->snd_card;
336 struct snd_pcm_substream *substream;
337 struct snd_pcm *pcm = rtd->pcm;
340 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
342 dev_err(card->dev, "failed to set DMA mask\n");
346 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
347 substream = pcm->streams[i].substream;
351 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
352 FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
354 dev_err(card->dev, "failed to allocate DMA buffer\n");
362 if (--i == 0 && pcm->streams[i].substream)
363 snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
368 static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm)
370 struct snd_pcm_substream *substream;
373 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
374 substream = pcm->streams[i].substream;
378 snd_dma_free_pages(&substream->dma_buffer);
379 substream->dma_buffer.area = NULL;
380 substream->dma_buffer.addr = 0;
384 struct snd_soc_component_driver fsl_asrc_component = {
386 .ops = &fsl_asrc_dma_pcm_ops,
387 .pcm_new = fsl_asrc_dma_pcm_new,
388 .pcm_free = fsl_asrc_dma_pcm_free,
390 EXPORT_SYMBOL_GPL(fsl_asrc_component);