1
2
3
4#include <linux/dma-mapping.h>
5#include <linux/dmaengine.h>
6#include <linux/dma/sprd-dma.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/of_reserved_mem.h>
10#include <linux/platform_device.h>
11#include <sound/pcm.h>
12#include <sound/pcm_params.h>
13#include <sound/soc.h>
14
15#include "sprd-pcm-dma.h"
16
17#define SPRD_PCM_DMA_LINKLIST_SIZE 64
18#define SPRD_PCM_DMA_BRUST_LEN 640
19
20struct sprd_pcm_dma_data {
21 struct dma_chan *chan;
22 struct dma_async_tx_descriptor *desc;
23 dma_cookie_t cookie;
24 dma_addr_t phys;
25 void *virt;
26 int pre_pointer;
27};
28
29struct sprd_pcm_dma_private {
30 struct snd_pcm_substream *substream;
31 struct sprd_pcm_dma_params *params;
32 struct sprd_pcm_dma_data data[SPRD_PCM_CHANNEL_MAX];
33 int hw_chan;
34 int dma_addr_offset;
35};
36
37static const struct snd_pcm_hardware sprd_pcm_hardware = {
38 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
39 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE |
40 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
41 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
42 .period_bytes_min = 1,
43 .period_bytes_max = 64 * 1024,
44 .periods_min = 1,
45 .periods_max = PAGE_SIZE / SPRD_PCM_DMA_LINKLIST_SIZE,
46 .buffer_bytes_max = 64 * 1024,
47};
48
49static int sprd_pcm_open(struct snd_soc_component *component,
50 struct snd_pcm_substream *substream)
51{
52 struct snd_pcm_runtime *runtime = substream->runtime;
53 struct device *dev = component->dev;
54 struct sprd_pcm_dma_private *dma_private;
55 int hw_chan = SPRD_PCM_CHANNEL_MAX;
56 int size, ret, i;
57
58 snd_soc_set_runtime_hwparams(substream, &sprd_pcm_hardware);
59
60 ret = snd_pcm_hw_constraint_step(runtime, 0,
61 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
62 SPRD_PCM_DMA_BRUST_LEN);
63 if (ret < 0)
64 return ret;
65
66 ret = snd_pcm_hw_constraint_step(runtime, 0,
67 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
68 SPRD_PCM_DMA_BRUST_LEN);
69 if (ret < 0)
70 return ret;
71
72 ret = snd_pcm_hw_constraint_integer(runtime,
73 SNDRV_PCM_HW_PARAM_PERIODS);
74 if (ret < 0)
75 return ret;
76
77 dma_private = devm_kzalloc(dev, sizeof(*dma_private), GFP_KERNEL);
78 if (!dma_private)
79 return -ENOMEM;
80
81 size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
82
83 for (i = 0; i < hw_chan; i++) {
84 struct sprd_pcm_dma_data *data = &dma_private->data[i];
85
86 data->virt = dmam_alloc_coherent(dev, size, &data->phys,
87 GFP_KERNEL);
88 if (!data->virt) {
89 ret = -ENOMEM;
90 goto error;
91 }
92 }
93
94 dma_private->hw_chan = hw_chan;
95 runtime->private_data = dma_private;
96 dma_private->substream = substream;
97
98 return 0;
99
100error:
101 for (i = 0; i < hw_chan; i++) {
102 struct sprd_pcm_dma_data *data = &dma_private->data[i];
103
104 if (data->virt)
105 dmam_free_coherent(dev, size, data->virt, data->phys);
106 }
107
108 devm_kfree(dev, dma_private);
109 return ret;
110}
111
112static int sprd_pcm_close(struct snd_soc_component *component,
113 struct snd_pcm_substream *substream)
114{
115 struct snd_pcm_runtime *runtime = substream->runtime;
116 struct sprd_pcm_dma_private *dma_private = runtime->private_data;
117 struct device *dev = component->dev;
118 int size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
119 int i;
120
121 for (i = 0; i < dma_private->hw_chan; i++) {
122 struct sprd_pcm_dma_data *data = &dma_private->data[i];
123
124 dmam_free_coherent(dev, size, data->virt, data->phys);
125 }
126
127 devm_kfree(dev, dma_private);
128
129 return 0;
130}
131
132static void sprd_pcm_dma_complete(void *data)
133{
134 struct sprd_pcm_dma_private *dma_private = data;
135 struct snd_pcm_substream *substream = dma_private->substream;
136
137 snd_pcm_period_elapsed(substream);
138}
139
140static void sprd_pcm_release_dma_channel(struct snd_pcm_substream *substream)
141{
142 struct snd_pcm_runtime *runtime = substream->runtime;
143 struct sprd_pcm_dma_private *dma_private = runtime->private_data;
144 int i;
145
146 for (i = 0; i < SPRD_PCM_CHANNEL_MAX; i++) {
147 struct sprd_pcm_dma_data *data = &dma_private->data[i];
148
149 if (data->chan) {
150 dma_release_channel(data->chan);
151 data->chan = NULL;
152 }
153 }
154}
155
156static int sprd_pcm_request_dma_channel(struct snd_soc_component *component,
157 struct snd_pcm_substream *substream,
158 int channels)
159{
160 struct snd_pcm_runtime *runtime = substream->runtime;
161 struct sprd_pcm_dma_private *dma_private = runtime->private_data;
162 struct device *dev = component->dev;
163 struct sprd_pcm_dma_params *dma_params = dma_private->params;
164 int i;
165
166 if (channels > SPRD_PCM_CHANNEL_MAX) {
167 dev_err(dev, "invalid dma channel number:%d\n", channels);
168 return -EINVAL;
169 }
170
171 for (i = 0; i < channels; i++) {
172 struct sprd_pcm_dma_data *data = &dma_private->data[i];
173
174 data->chan = dma_request_slave_channel(dev,
175 dma_params->chan_name[i]);
176 if (!data->chan) {
177 dev_err(dev, "failed to request dma channel:%s\n",
178 dma_params->chan_name[i]);
179 sprd_pcm_release_dma_channel(substream);
180 return -ENODEV;
181 }
182 }
183
184 return 0;
185}
186
187static int sprd_pcm_hw_params(struct snd_soc_component *component,
188 struct snd_pcm_substream *substream,
189 struct snd_pcm_hw_params *params)
190{
191 struct snd_pcm_runtime *runtime = substream->runtime;
192 struct sprd_pcm_dma_private *dma_private = runtime->private_data;
193 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
194 struct sprd_pcm_dma_params *dma_params;
195 size_t totsize = params_buffer_bytes(params);
196 size_t period = params_period_bytes(params);
197 int channels = params_channels(params);
198 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
199 struct scatterlist *sg;
200 unsigned long flags;
201 int ret, i, j, sg_num;
202
203 dma_params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
204 if (!dma_params) {
205 dev_warn(component->dev, "no dma parameters setting\n");
206 dma_private->params = NULL;
207 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
208 runtime->dma_bytes = totsize;
209 return 0;
210 }
211
212 if (!dma_private->params) {
213 dma_private->params = dma_params;
214 ret = sprd_pcm_request_dma_channel(component,
215 substream, channels);
216 if (ret)
217 return ret;
218 }
219
220 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
221
222 runtime->dma_bytes = totsize;
223 sg_num = totsize / period;
224 dma_private->dma_addr_offset = totsize / channels;
225
226 sg = devm_kcalloc(component->dev, sg_num, sizeof(*sg), GFP_KERNEL);
227 if (!sg) {
228 ret = -ENOMEM;
229 goto sg_err;
230 }
231
232 for (i = 0; i < channels; i++) {
233 struct sprd_pcm_dma_data *data = &dma_private->data[i];
234 struct dma_chan *chan = data->chan;
235 struct dma_slave_config config = { };
236 struct sprd_dma_linklist link = { };
237 enum dma_transfer_direction dir;
238 struct scatterlist *sgt = sg;
239
240 config.src_maxburst = dma_params->fragment_len[i];
241 config.src_addr_width = dma_params->datawidth[i];
242 config.dst_addr_width = dma_params->datawidth[i];
243 if (is_playback) {
244 config.src_addr = runtime->dma_addr +
245 i * dma_private->dma_addr_offset;
246 config.dst_addr = dma_params->dev_phys[i];
247 dir = DMA_MEM_TO_DEV;
248 } else {
249 config.src_addr = dma_params->dev_phys[i];
250 config.dst_addr = runtime->dma_addr +
251 i * dma_private->dma_addr_offset;
252 dir = DMA_DEV_TO_MEM;
253 }
254
255 sg_init_table(sgt, sg_num);
256 for (j = 0; j < sg_num; j++, sgt++) {
257 u32 sg_len = period / channels;
258
259 sg_dma_len(sgt) = sg_len;
260 sg_dma_address(sgt) = runtime->dma_addr +
261 i * dma_private->dma_addr_offset + sg_len * j;
262 }
263
264
265
266
267
268 link.virt_addr = (unsigned long)data->virt;
269 link.phy_addr = data->phys;
270
271 ret = dmaengine_slave_config(chan, &config);
272 if (ret) {
273 dev_err(component->dev,
274 "failed to set slave configuration: %d\n", ret);
275 goto config_err;
276 }
277
278
279
280
281
282 flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG,
283 SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT);
284 data->desc = chan->device->device_prep_slave_sg(chan, sg,
285 sg_num, dir,
286 flags, &link);
287 if (!data->desc) {
288 dev_err(component->dev, "failed to prepare slave sg\n");
289 ret = -ENOMEM;
290 goto config_err;
291 }
292
293 if (!runtime->no_period_wakeup) {
294 data->desc->callback = sprd_pcm_dma_complete;
295 data->desc->callback_param = dma_private;
296 }
297 }
298
299 devm_kfree(component->dev, sg);
300
301 return 0;
302
303config_err:
304 devm_kfree(component->dev, sg);
305sg_err:
306 sprd_pcm_release_dma_channel(substream);
307 return ret;
308}
309
310static int sprd_pcm_hw_free(struct snd_soc_component *component,
311 struct snd_pcm_substream *substream)
312{
313 snd_pcm_set_runtime_buffer(substream, NULL);
314 sprd_pcm_release_dma_channel(substream);
315
316 return 0;
317}
318
319static int sprd_pcm_trigger(struct snd_soc_component *component,
320 struct snd_pcm_substream *substream, int cmd)
321{
322 struct sprd_pcm_dma_private *dma_private =
323 substream->runtime->private_data;
324 int ret = 0, i;
325
326 switch (cmd) {
327 case SNDRV_PCM_TRIGGER_START:
328 for (i = 0; i < dma_private->hw_chan; i++) {
329 struct sprd_pcm_dma_data *data = &dma_private->data[i];
330
331 if (!data->desc)
332 continue;
333
334 data->cookie = dmaengine_submit(data->desc);
335 ret = dma_submit_error(data->cookie);
336 if (ret) {
337 dev_err(component->dev,
338 "failed to submit dma request: %d\n",
339 ret);
340 return ret;
341 }
342
343 dma_async_issue_pending(data->chan);
344 }
345
346 break;
347 case SNDRV_PCM_TRIGGER_RESUME:
348 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
349 for (i = 0; i < dma_private->hw_chan; i++) {
350 struct sprd_pcm_dma_data *data = &dma_private->data[i];
351
352 if (data->chan)
353 dmaengine_resume(data->chan);
354 }
355
356 break;
357 case SNDRV_PCM_TRIGGER_STOP:
358 for (i = 0; i < dma_private->hw_chan; i++) {
359 struct sprd_pcm_dma_data *data = &dma_private->data[i];
360
361 if (data->chan)
362 dmaengine_terminate_async(data->chan);
363 }
364
365 break;
366 case SNDRV_PCM_TRIGGER_SUSPEND:
367 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
368 for (i = 0; i < dma_private->hw_chan; i++) {
369 struct sprd_pcm_dma_data *data = &dma_private->data[i];
370
371 if (data->chan)
372 dmaengine_pause(data->chan);
373 }
374
375 break;
376 default:
377 ret = -EINVAL;
378 }
379
380 return ret;
381}
382
383static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_soc_component *component,
384 struct snd_pcm_substream *substream)
385{
386 struct snd_pcm_runtime *runtime = substream->runtime;
387 struct sprd_pcm_dma_private *dma_private = runtime->private_data;
388 int pointer[SPRD_PCM_CHANNEL_MAX];
389 int bytes_of_pointer = 0, sel_max = 0, i;
390 snd_pcm_uframes_t x;
391 struct dma_tx_state state;
392 enum dma_status status;
393
394 for (i = 0; i < dma_private->hw_chan; i++) {
395 struct sprd_pcm_dma_data *data = &dma_private->data[i];
396
397 if (!data->chan)
398 continue;
399
400 status = dmaengine_tx_status(data->chan, data->cookie, &state);
401 if (status == DMA_ERROR) {
402 dev_err(component->dev,
403 "failed to get dma channel %d status\n", i);
404 return 0;
405 }
406
407
408
409
410
411 pointer[i] = state.residue - runtime->dma_addr -
412 i * dma_private->dma_addr_offset;
413
414 if (i == 0) {
415 bytes_of_pointer = pointer[i];
416 sel_max = pointer[i] < data->pre_pointer ? 1 : 0;
417 } else {
418 sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0;
419
420 if (sel_max)
421 bytes_of_pointer =
422 max(pointer[i], pointer[i - 1]) << 1;
423 else
424 bytes_of_pointer =
425 min(pointer[i], pointer[i - 1]) << 1;
426 }
427
428 data->pre_pointer = pointer[i];
429 }
430
431 x = bytes_to_frames(runtime, bytes_of_pointer);
432 if (x == runtime->buffer_size)
433 x = 0;
434
435 return x;
436}
437
438static int sprd_pcm_mmap(struct snd_soc_component *component,
439 struct snd_pcm_substream *substream,
440 struct vm_area_struct *vma)
441{
442 struct snd_pcm_runtime *runtime = substream->runtime;
443
444 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
445 return remap_pfn_range(vma, vma->vm_start,
446 runtime->dma_addr >> PAGE_SHIFT,
447 vma->vm_end - vma->vm_start,
448 vma->vm_page_prot);
449}
450
451static int sprd_pcm_new(struct snd_soc_component *component,
452 struct snd_soc_pcm_runtime *rtd)
453{
454 struct snd_card *card = rtd->card->snd_card;
455 struct snd_pcm *pcm = rtd->pcm;
456 struct snd_pcm_substream *substream;
457 int ret;
458
459 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
460 if (ret)
461 return ret;
462
463 substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
464 if (substream) {
465 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
466 sprd_pcm_hardware.buffer_bytes_max,
467 &substream->dma_buffer);
468 if (ret) {
469 dev_err(card->dev,
470 "can't alloc playback dma buffer: %d\n", ret);
471 return ret;
472 }
473 }
474
475 substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
476 if (substream) {
477 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
478 sprd_pcm_hardware.buffer_bytes_max,
479 &substream->dma_buffer);
480 if (ret) {
481 dev_err(card->dev,
482 "can't alloc capture dma buffer: %d\n", ret);
483 snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
484 return ret;
485 }
486 }
487
488 return 0;
489}
490
491static void sprd_pcm_free(struct snd_soc_component *component,
492 struct snd_pcm *pcm)
493{
494 struct snd_pcm_substream *substream;
495 int i;
496
497 for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) {
498 substream = pcm->streams[i].substream;
499 if (substream) {
500 snd_dma_free_pages(&substream->dma_buffer);
501 substream->dma_buffer.area = NULL;
502 substream->dma_buffer.addr = 0;
503 }
504 }
505}
506
507static const struct snd_soc_component_driver sprd_soc_component = {
508 .name = DRV_NAME,
509 .open = sprd_pcm_open,
510 .close = sprd_pcm_close,
511 .hw_params = sprd_pcm_hw_params,
512 .hw_free = sprd_pcm_hw_free,
513 .trigger = sprd_pcm_trigger,
514 .pointer = sprd_pcm_pointer,
515 .mmap = sprd_pcm_mmap,
516 .pcm_construct = sprd_pcm_new,
517 .pcm_destruct = sprd_pcm_free,
518 .compress_ops = &sprd_platform_compress_ops,
519};
520
521static int sprd_soc_platform_probe(struct platform_device *pdev)
522{
523 struct device_node *np = pdev->dev.of_node;
524 int ret;
525
526 ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
527 if (ret)
528 dev_warn(&pdev->dev,
529 "no reserved DMA memory for audio platform device\n");
530
531 ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component,
532 NULL, 0);
533 if (ret)
534 dev_err(&pdev->dev, "could not register platform:%d\n", ret);
535
536 return ret;
537}
538
539static const struct of_device_id sprd_pcm_of_match[] = {
540 { .compatible = "sprd,pcm-platform", },
541 { },
542};
543MODULE_DEVICE_TABLE(of, sprd_pcm_of_match);
544
545static struct platform_driver sprd_pcm_driver = {
546 .driver = {
547 .name = "sprd-pcm-audio",
548 .of_match_table = sprd_pcm_of_match,
549 },
550
551 .probe = sprd_soc_platform_probe,
552};
553
554module_platform_driver(sprd_pcm_driver);
555
556MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA");
557MODULE_LICENSE("GPL v2");
558MODULE_ALIAS("platform:sprd-audio");
559
