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Linux/sound/soc/fsl/fsl_asrc_dma.c

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  1 /*
  2  * Freescale ASRC ALSA SoC Platform (DMA) driver
  3  *
  4  * Copyright (C) 2014 Freescale Semiconductor, Inc.
  5  *
  6  * Author: Nicolin Chen <nicoleotsuka@gmail.com>
  7  *
  8  * This file is licensed under the terms of the GNU General Public License
  9  * version 2. This program is licensed "as is" without any warranty of any
 10  * kind, whether express or implied.
 11  */
 12 
 13 #include <linux/dma-mapping.h>
 14 #include <linux/module.h>
 15 #include <linux/platform_data/dma-imx.h>
 16 #include <sound/dmaengine_pcm.h>
 17 #include <sound/pcm_params.h>
 18 
 19 #include "fsl_asrc.h"
 20 
 21 #define FSL_ASRC_DMABUF_SIZE    (256 * 1024)
 22 
 23 static struct snd_pcm_hardware snd_imx_hardware = {
 24         .info = SNDRV_PCM_INFO_INTERLEAVED |
 25                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 26                 SNDRV_PCM_INFO_MMAP |
 27                 SNDRV_PCM_INFO_MMAP_VALID |
 28                 SNDRV_PCM_INFO_PAUSE |
 29                 SNDRV_PCM_INFO_RESUME,
 30         .buffer_bytes_max = FSL_ASRC_DMABUF_SIZE,
 31         .period_bytes_min = 128,
 32         .period_bytes_max = 65535, /* Limited by SDMA engine */
 33         .periods_min = 2,
 34         .periods_max = 255,
 35         .fifo_size = 0,
 36 };
 37 
 38 static bool filter(struct dma_chan *chan, void *param)
 39 {
 40         if (!imx_dma_is_general_purpose(chan))
 41                 return false;
 42 
 43         chan->private = param;
 44 
 45         return true;
 46 }
 47 
 48 static void fsl_asrc_dma_complete(void *arg)
 49 {
 50         struct snd_pcm_substream *substream = arg;
 51         struct snd_pcm_runtime *runtime = substream->runtime;
 52         struct fsl_asrc_pair *pair = runtime->private_data;
 53 
 54         pair->pos += snd_pcm_lib_period_bytes(substream);
 55         if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
 56                 pair->pos = 0;
 57 
 58         snd_pcm_period_elapsed(substream);
 59 }
 60 
 61 static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream)
 62 {
 63         u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN;
 64         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 65         struct snd_pcm_runtime *runtime = substream->runtime;
 66         struct fsl_asrc_pair *pair = runtime->private_data;
 67         struct device *dev = rtd->platform->dev;
 68         unsigned long flags = DMA_CTRL_ACK;
 69 
 70         /* Prepare and submit Front-End DMA channel */
 71         if (!substream->runtime->no_period_wakeup)
 72                 flags |= DMA_PREP_INTERRUPT;
 73 
 74         pair->pos = 0;
 75         pair->desc[!dir] = dmaengine_prep_dma_cyclic(
 76                         pair->dma_chan[!dir], runtime->dma_addr,
 77                         snd_pcm_lib_buffer_bytes(substream),
 78                         snd_pcm_lib_period_bytes(substream),
 79                         dir == OUT ? DMA_TO_DEVICE : DMA_FROM_DEVICE, flags);
 80         if (!pair->desc[!dir]) {
 81                 dev_err(dev, "failed to prepare slave DMA for Front-End\n");
 82                 return -ENOMEM;
 83         }
 84 
 85         pair->desc[!dir]->callback = fsl_asrc_dma_complete;
 86         pair->desc[!dir]->callback_param = substream;
 87 
 88         dmaengine_submit(pair->desc[!dir]);
 89 
 90         /* Prepare and submit Back-End DMA channel */
 91         pair->desc[dir] = dmaengine_prep_dma_cyclic(
 92                         pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0);
 93         if (!pair->desc[dir]) {
 94                 dev_err(dev, "failed to prepare slave DMA for Back-End\n");
 95                 return -ENOMEM;
 96         }
 97 
 98         dmaengine_submit(pair->desc[dir]);
 99 
100         return 0;
101 }
102 
103 static int fsl_asrc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
104 {
105         struct snd_pcm_runtime *runtime = substream->runtime;
106         struct fsl_asrc_pair *pair = runtime->private_data;
107         int ret;
108 
109         switch (cmd) {
110         case SNDRV_PCM_TRIGGER_START:
111         case SNDRV_PCM_TRIGGER_RESUME:
112         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
113                 ret = fsl_asrc_dma_prepare_and_submit(substream);
114                 if (ret)
115                         return ret;
116                 dma_async_issue_pending(pair->dma_chan[IN]);
117                 dma_async_issue_pending(pair->dma_chan[OUT]);
118                 break;
119         case SNDRV_PCM_TRIGGER_STOP:
120         case SNDRV_PCM_TRIGGER_SUSPEND:
121         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
122                 dmaengine_terminate_all(pair->dma_chan[OUT]);
123                 dmaengine_terminate_all(pair->dma_chan[IN]);
124                 break;
125         default:
126                 return -EINVAL;
127         }
128 
129         return 0;
130 }
131 
132 static int fsl_asrc_dma_hw_params(struct snd_pcm_substream *substream,
133                                   struct snd_pcm_hw_params *params)
134 {
135         enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
136         struct snd_soc_pcm_runtime *rtd = substream->private_data;
137         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
138         struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL;
139         struct snd_dmaengine_dai_dma_data *dma_params_be = NULL;
140         struct snd_pcm_runtime *runtime = substream->runtime;
141         struct fsl_asrc_pair *pair = runtime->private_data;
142         struct fsl_asrc *asrc_priv = pair->asrc_priv;
143         struct dma_slave_config config_fe, config_be;
144         enum asrc_pair_index index = pair->index;
145         struct device *dev = rtd->platform->dev;
146         int stream = substream->stream;
147         struct imx_dma_data *tmp_data;
148         struct snd_soc_dpcm *dpcm;
149         struct dma_chan *tmp_chan;
150         struct device *dev_be;
151         u8 dir = tx ? OUT : IN;
152         dma_cap_mask_t mask;
153         int ret;
154 
155         /* Fetch the Back-End dma_data from DPCM */
156         list_for_each_entry(dpcm, &rtd->dpcm[stream].be_clients, list_be) {
157                 struct snd_soc_pcm_runtime *be = dpcm->be;
158                 struct snd_pcm_substream *substream_be;
159                 struct snd_soc_dai *dai = be->cpu_dai;
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(rtd->cpu_dai, substream);
177         dma_params_fe->addr = asrc_priv->paddr + REG_ASRDx(!dir, index);
178         dma_params_fe->maxburst = dma_params_be->maxburst;
179 
180         pair->dma_chan[!dir] = fsl_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         memset(&config_fe, 0, sizeof(config_fe));
187         ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe);
188         if (ret) {
189                 dev_err(dev, "failed to prepare DMA config for Front-End\n");
190                 return ret;
191         }
192 
193         ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe);
194         if (ret) {
195                 dev_err(dev, "failed to config DMA channel for Front-End\n");
196                 return ret;
197         }
198 
199         /* Request and config DMA channel for Back-End */
200         dma_cap_zero(mask);
201         dma_cap_set(DMA_SLAVE, mask);
202         dma_cap_set(DMA_CYCLIC, mask);
203 
204         /* Get DMA request of Back-End */
205         tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
206         tmp_data = tmp_chan->private;
207         pair->dma_data.dma_request = tmp_data->dma_request;
208         dma_release_channel(tmp_chan);
209 
210         /* Get DMA request of Front-End */
211         tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
212         tmp_data = tmp_chan->private;
213         pair->dma_data.dma_request2 = tmp_data->dma_request;
214         pair->dma_data.peripheral_type = tmp_data->peripheral_type;
215         pair->dma_data.priority = tmp_data->priority;
216         dma_release_channel(tmp_chan);
217 
218         pair->dma_chan[dir] = dma_request_channel(mask, filter, &pair->dma_data);
219         if (!pair->dma_chan[dir]) {
220                 dev_err(dev, "failed to request DMA channel for Back-End\n");
221                 return -EINVAL;
222         }
223 
224         if (asrc_priv->asrc_width == 16)
225                 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
226         else
227                 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
228 
229         config_be.direction = DMA_DEV_TO_DEV;
230         config_be.src_addr_width = buswidth;
231         config_be.src_maxburst = dma_params_be->maxburst;
232         config_be.dst_addr_width = buswidth;
233         config_be.dst_maxburst = dma_params_be->maxburst;
234 
235         if (tx) {
236                 config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index);
237                 config_be.dst_addr = dma_params_be->addr;
238         } else {
239                 config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index);
240                 config_be.src_addr = dma_params_be->addr;
241         }
242 
243         ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
244         if (ret) {
245                 dev_err(dev, "failed to config DMA channel for Back-End\n");
246                 return ret;
247         }
248 
249         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
250 
251         return 0;
252 }
253 
254 static int fsl_asrc_dma_hw_free(struct snd_pcm_substream *substream)
255 {
256         struct snd_pcm_runtime *runtime = substream->runtime;
257         struct fsl_asrc_pair *pair = runtime->private_data;
258 
259         snd_pcm_set_runtime_buffer(substream, NULL);
260 
261         if (pair->dma_chan[IN])
262                 dma_release_channel(pair->dma_chan[IN]);
263 
264         if (pair->dma_chan[OUT])
265                 dma_release_channel(pair->dma_chan[OUT]);
266 
267         pair->dma_chan[IN] = NULL;
268         pair->dma_chan[OUT] = NULL;
269 
270         return 0;
271 }
272 
273 static int fsl_asrc_dma_startup(struct snd_pcm_substream *substream)
274 {
275         struct snd_soc_pcm_runtime *rtd = substream->private_data;
276         struct snd_pcm_runtime *runtime = substream->runtime;
277         struct device *dev = rtd->platform->dev;
278         struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
279         struct fsl_asrc_pair *pair;
280 
281         pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
282         if (!pair) {
283                 dev_err(dev, "failed to allocate pair\n");
284                 return -ENOMEM;
285         }
286 
287         pair->asrc_priv = asrc_priv;
288 
289         runtime->private_data = pair;
290 
291         snd_pcm_hw_constraint_integer(substream->runtime,
292                                       SNDRV_PCM_HW_PARAM_PERIODS);
293         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
294 
295         return 0;
296 }
297 
298 static int fsl_asrc_dma_shutdown(struct snd_pcm_substream *substream)
299 {
300         struct snd_pcm_runtime *runtime = substream->runtime;
301         struct fsl_asrc_pair *pair = runtime->private_data;
302         struct fsl_asrc *asrc_priv;
303 
304         if (!pair)
305                 return 0;
306 
307         asrc_priv = pair->asrc_priv;
308 
309         if (asrc_priv->pair[pair->index] == pair)
310                 asrc_priv->pair[pair->index] = NULL;
311 
312         kfree(pair);
313 
314         return 0;
315 }
316 
317 static snd_pcm_uframes_t fsl_asrc_dma_pcm_pointer(struct snd_pcm_substream *substream)
318 {
319         struct snd_pcm_runtime *runtime = substream->runtime;
320         struct fsl_asrc_pair *pair = runtime->private_data;
321 
322         return bytes_to_frames(substream->runtime, pair->pos);
323 }
324 
325 static struct snd_pcm_ops fsl_asrc_dma_pcm_ops = {
326         .ioctl          = snd_pcm_lib_ioctl,
327         .hw_params      = fsl_asrc_dma_hw_params,
328         .hw_free        = fsl_asrc_dma_hw_free,
329         .trigger        = fsl_asrc_dma_trigger,
330         .open           = fsl_asrc_dma_startup,
331         .close          = fsl_asrc_dma_shutdown,
332         .pointer        = fsl_asrc_dma_pcm_pointer,
333 };
334 
335 static int fsl_asrc_dma_pcm_new(struct snd_soc_pcm_runtime *rtd)
336 {
337         struct snd_card *card = rtd->card->snd_card;
338         struct snd_pcm_substream *substream;
339         struct snd_pcm *pcm = rtd->pcm;
340         int ret, i;
341 
342         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
343         if (ret) {
344                 dev_err(card->dev, "failed to set DMA mask\n");
345                 return ret;
346         }
347 
348         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
349                 substream = pcm->streams[i].substream;
350                 if (!substream)
351                         continue;
352 
353                 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
354                                 FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
355                 if (ret) {
356                         dev_err(card->dev, "failed to allocate DMA buffer\n");
357                         goto err;
358                 }
359         }
360 
361         return 0;
362 
363 err:
364         if (--i == 0 && pcm->streams[i].substream)
365                 snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
366 
367         return ret;
368 }
369 
370 static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm)
371 {
372         struct snd_pcm_substream *substream;
373         int i;
374 
375         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
376                 substream = pcm->streams[i].substream;
377                 if (!substream)
378                         continue;
379 
380                 snd_dma_free_pages(&substream->dma_buffer);
381                 substream->dma_buffer.area = NULL;
382                 substream->dma_buffer.addr = 0;
383         }
384 }
385 
386 struct snd_soc_platform_driver fsl_asrc_platform = {
387         .ops            = &fsl_asrc_dma_pcm_ops,
388         .pcm_new        = fsl_asrc_dma_pcm_new,
389         .pcm_free       = fsl_asrc_dma_pcm_free,
390 };
391 EXPORT_SYMBOL_GPL(fsl_asrc_platform);
392 

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