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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>
14
15#include "fsl_asrc.h"
16
17#define FSL_ASRC_DMABUF_SIZE (256 * 1024)
18
19static const 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 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,
29 .periods_min = 2,
30 .periods_max = 255,
31 .fifo_size = 0,
32};
33
34static bool filter(struct dma_chan *chan, void *param)
35{
36 if (!imx_dma_is_general_purpose(chan))
37 return false;
38
39 chan->private = param;
40
41 return true;
42}
43
44static void fsl_asrc_dma_complete(void *arg)
45{
46 struct snd_pcm_substream *substream = arg;
47 struct snd_pcm_runtime *runtime = substream->runtime;
48 struct fsl_asrc_pair *pair = runtime->private_data;
49
50 pair->pos += snd_pcm_lib_period_bytes(substream);
51 if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
52 pair->pos = 0;
53
54 snd_pcm_period_elapsed(substream);
55}
56
57static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream)
58{
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;
66
67
68 if (!substream->runtime->no_period_wakeup)
69 flags |= DMA_PREP_INTERRUPT;
70
71 pair->pos = 0;
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");
79 return -ENOMEM;
80 }
81
82 pair->desc[!dir]->callback = fsl_asrc_dma_complete;
83 pair->desc[!dir]->callback_param = substream;
84
85 dmaengine_submit(pair->desc[!dir]);
86
87
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");
92 return -ENOMEM;
93 }
94
95 dmaengine_submit(pair->desc[dir]);
96
97 return 0;
98}
99
100static int fsl_asrc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
101{
102 struct snd_pcm_runtime *runtime = substream->runtime;
103 struct fsl_asrc_pair *pair = runtime->private_data;
104 int ret;
105
106 switch (cmd) {
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);
111 if (ret)
112 return ret;
113 dma_async_issue_pending(pair->dma_chan[IN]);
114 dma_async_issue_pending(pair->dma_chan[OUT]);
115 break;
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]);
121 break;
122 default:
123 return -EINVAL;
124 }
125
126 return 0;
127}
128
129static int fsl_asrc_dma_hw_params(struct snd_pcm_substream *substream,
130 struct snd_pcm_hw_params *params)
131{
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;
150 dma_cap_mask_t mask;
151 int ret;
152
153
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 = be->cpu_dai;
158
159 if (dpcm->fe != rtd)
160 continue;
161
162 substream_be = snd_soc_dpcm_get_substream(be, stream);
163 dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be);
164 dev_be = dai->dev;
165 break;
166 }
167
168 if (!dma_params_be) {
169 dev_err(dev, "failed to get the substream of Back-End\n");
170 return -EINVAL;
171 }
172
173
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;
177
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");
181 return -EINVAL;
182 }
183
184 memset(&config_fe, 0, sizeof(config_fe));
185 ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe);
186 if (ret) {
187 dev_err(dev, "failed to prepare DMA config for Front-End\n");
188 return ret;
189 }
190
191 ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe);
192 if (ret) {
193 dev_err(dev, "failed to config DMA channel for Front-End\n");
194 return ret;
195 }
196
197
198 dma_cap_zero(mask);
199 dma_cap_set(DMA_SLAVE, mask);
200 dma_cap_set(DMA_CYCLIC, mask);
201
202
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);
207
208
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);
215
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");
219 return -EINVAL;
220 }
221
222 if (asrc_priv->asrc_width == 16)
223 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
224 else
225 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
226
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;
232
233 if (tx) {
234 config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index);
235 config_be.dst_addr = dma_params_be->addr;
236 } else {
237 config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index);
238 config_be.src_addr = dma_params_be->addr;
239 }
240
241 ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
242 if (ret) {
243 dev_err(dev, "failed to config DMA channel for Back-End\n");
244 return ret;
245 }
246
247 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
248
249 return 0;
250}
251
252static int fsl_asrc_dma_hw_free(struct snd_pcm_substream *substream)
253{
254 struct snd_pcm_runtime *runtime = substream->runtime;
255 struct fsl_asrc_pair *pair = runtime->private_data;
256
257 snd_pcm_set_runtime_buffer(substream, NULL);
258
259 if (pair->dma_chan[IN])
260 dma_release_channel(pair->dma_chan[IN]);
261
262 if (pair->dma_chan[OUT])
263 dma_release_channel(pair->dma_chan[OUT]);
264
265 pair->dma_chan[IN] = NULL;
266 pair->dma_chan[OUT] = NULL;
267
268 return 0;
269}
270
271static int fsl_asrc_dma_startup(struct snd_pcm_substream *substream)
272{
273 struct snd_soc_pcm_runtime *rtd = substream->private_data;
274 struct snd_pcm_runtime *runtime = substream->runtime;
275 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
276 struct device *dev = component->dev;
277 struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
278 struct fsl_asrc_pair *pair;
279
280 pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
281 if (!pair)
282 return -ENOMEM;
283
284 pair->asrc_priv = asrc_priv;
285
286 runtime->private_data = pair;
287
288 snd_pcm_hw_constraint_integer(substream->runtime,
289 SNDRV_PCM_HW_PARAM_PERIODS);
290 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
291
292 return 0;
293}
294
295static int fsl_asrc_dma_shutdown(struct snd_pcm_substream *substream)
296{
297 struct snd_pcm_runtime *runtime = substream->runtime;
298 struct fsl_asrc_pair *pair = runtime->private_data;
299 struct fsl_asrc *asrc_priv;
300
301 if (!pair)
302 return 0;
303
304 asrc_priv = pair->asrc_priv;
305
306 if (asrc_priv->pair[pair->index] == pair)
307 asrc_priv->pair[pair->index] = NULL;
308
309 kfree(pair);
310
311 return 0;
312}
313
314static snd_pcm_uframes_t fsl_asrc_dma_pcm_pointer(struct snd_pcm_substream *substream)
315{
316 struct snd_pcm_runtime *runtime = substream->runtime;
317 struct fsl_asrc_pair *pair = runtime->private_data;
318
319 return bytes_to_frames(substream->runtime, pair->pos);
320}
321
322static const struct snd_pcm_ops fsl_asrc_dma_pcm_ops = {
323 .ioctl = snd_pcm_lib_ioctl,
324 .hw_params = fsl_asrc_dma_hw_params,
325 .hw_free = fsl_asrc_dma_hw_free,
326 .trigger = fsl_asrc_dma_trigger,
327 .open = fsl_asrc_dma_startup,
328 .close = fsl_asrc_dma_shutdown,
329 .pointer = fsl_asrc_dma_pcm_pointer,
330};
331
332static int fsl_asrc_dma_pcm_new(struct snd_soc_pcm_runtime *rtd)
333{
334 struct snd_card *card = rtd->card->snd_card;
335 struct snd_pcm_substream *substream;
336 struct snd_pcm *pcm = rtd->pcm;
337 int ret, i;
338
339 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
340 if (ret) {
341 dev_err(card->dev, "failed to set DMA mask\n");
342 return ret;
343 }
344
345 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
346 substream = pcm->streams[i].substream;
347 if (!substream)
348 continue;
349
350 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
351 FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
352 if (ret) {
353 dev_err(card->dev, "failed to allocate DMA buffer\n");
354 goto err;
355 }
356 }
357
358 return 0;
359
360err:
361 if (--i == 0 && pcm->streams[i].substream)
362 snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
363
364 return ret;
365}
366
367static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm)
368{
369 struct snd_pcm_substream *substream;
370 int i;
371
372 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
373 substream = pcm->streams[i].substream;
374 if (!substream)
375 continue;
376
377 snd_dma_free_pages(&substream->dma_buffer);
378 substream->dma_buffer.area = NULL;
379 substream->dma_buffer.addr = 0;
380 }
381}
382
383struct snd_soc_component_driver fsl_asrc_component = {
384 .name = DRV_NAME,
385 .ops = &fsl_asrc_dma_pcm_ops,
386 .pcm_new = fsl_asrc_dma_pcm_new,
387 .pcm_free = fsl_asrc_dma_pcm_free,
388};
389EXPORT_SYMBOL_GPL(fsl_asrc_component);
390
