1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Freescale ASRC ALSA SoC Platform (DMA) driver
4 //
5 // Copyright (C) 2014 Freescale Semiconductor, Inc.
6 //
7 // Author: Nicolin Chen <nicoleotsuka@gmail.com>
8
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_common.h"
16
17 #define FSL_ASRC_DMABUF_SIZE (256 * 1024)
18
19 static 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 .buffer_bytes_max = FSL_ASRC_DMABUF_SIZE,
25 .period_bytes_min = 128,
26 .period_bytes_max = 65535, /* Limited by SDMA engine */
27 .periods_min = 2,
28 .periods_max = 255,
29 .fifo_size = 0,
30 };
31
filter(struct dma_chan * chan,void * param)32 static bool filter(struct dma_chan *chan, void *param)
33 {
34 if (!imx_dma_is_general_purpose(chan))
35 return false;
36
37 chan->private = param;
38
39 return true;
40 }
41
fsl_asrc_dma_complete(void * arg)42 static void fsl_asrc_dma_complete(void *arg)
43 {
44 struct snd_pcm_substream *substream = arg;
45 struct snd_pcm_runtime *runtime = substream->runtime;
46 struct fsl_asrc_pair *pair = runtime->private_data;
47
48 pair->pos += snd_pcm_lib_period_bytes(substream);
49 if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
50 pair->pos = 0;
51
52 snd_pcm_period_elapsed(substream);
53 }
54
fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream * substream,struct snd_soc_component * component)55 static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream,
56 struct snd_soc_component *component)
57 {
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;
63
64 /* Prepare and submit Front-End DMA channel */
65 if (!substream->runtime->no_period_wakeup)
66 flags |= DMA_PREP_INTERRUPT;
67
68 pair->pos = 0;
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");
76 return -ENOMEM;
77 }
78
79 pair->desc[!dir]->callback = fsl_asrc_dma_complete;
80 pair->desc[!dir]->callback_param = substream;
81
82 dmaengine_submit(pair->desc[!dir]);
83
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");
89 return -ENOMEM;
90 }
91
92 dmaengine_submit(pair->desc[dir]);
93
94 return 0;
95 }
96
fsl_asrc_dma_trigger(struct snd_soc_component * component,struct snd_pcm_substream * substream,int cmd)97 static int fsl_asrc_dma_trigger(struct snd_soc_component *component,
98 struct snd_pcm_substream *substream, int cmd)
99 {
100 struct snd_pcm_runtime *runtime = substream->runtime;
101 struct fsl_asrc_pair *pair = runtime->private_data;
102 int ret;
103
104 switch (cmd) {
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);
109 if (ret)
110 return ret;
111 dma_async_issue_pending(pair->dma_chan[IN]);
112 dma_async_issue_pending(pair->dma_chan[OUT]);
113 break;
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]);
119 break;
120 default:
121 return -EINVAL;
122 }
123
124 return 0;
125 }
126
fsl_asrc_dma_hw_params(struct snd_soc_component * component,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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)
130 {
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;
150 dma_cap_mask_t mask;
151 int ret, width;
152
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);
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 /* 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;
177
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");
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 /* Request and config DMA channel for Back-End */
198 dma_cap_zero(mask);
199 dma_cap_set(DMA_SLAVE, mask);
200 dma_cap_set(DMA_CYCLIC, mask);
201
202 /*
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.
205 */
206 component_be = snd_soc_lookup_component_nolocked(dev_be, SND_DMAENGINE_PCM_DRV_NAME);
207 if (component_be) {
208 be_chan = soc_component_to_pcm(component_be)->chan[substream->stream];
209 tmp_chan = be_chan;
210 }
211 if (!tmp_chan) {
212 tmp_chan = dma_request_chan(dev_be, tx ? "tx" : "rx");
213 if (IS_ERR(tmp_chan)) {
214 dev_err(dev, "failed to request DMA channel for Back-End\n");
215 return -EINVAL;
216 }
217 }
218
219 /*
220 * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each
221 * peripheral, unlike SDMA channel that is allocated dynamically. So no
222 * need to configure dma_request and dma_request2, but get dma_chan of
223 * Back-End device directly via dma_request_chan.
224 */
225 if (!asrc->use_edma) {
226 /* Get DMA request of Back-End */
227 tmp_data = tmp_chan->private;
228 pair->dma_data.dma_request = tmp_data->dma_request;
229 if (!be_chan)
230 dma_release_channel(tmp_chan);
231
232 /* Get DMA request of Front-End */
233 tmp_chan = asrc->get_dma_channel(pair, dir);
234 tmp_data = tmp_chan->private;
235 pair->dma_data.dma_request2 = tmp_data->dma_request;
236 pair->dma_data.peripheral_type = tmp_data->peripheral_type;
237 pair->dma_data.priority = tmp_data->priority;
238 dma_release_channel(tmp_chan);
239
240 of_dma_node = pair->dma_chan[!dir]->device->dev->of_node;
241 pair->dma_chan[dir] =
242 __dma_request_channel(&mask, filter, &pair->dma_data,
243 of_dma_node);
244 pair->req_dma_chan = true;
245 } else {
246 pair->dma_chan[dir] = tmp_chan;
247 /* Do not flag to release if we are reusing the Back-End one */
248 pair->req_dma_chan = !be_chan;
249 }
250
251 if (!pair->dma_chan[dir]) {
252 dev_err(dev, "failed to request DMA channel for Back-End\n");
253 return -EINVAL;
254 }
255
256 width = snd_pcm_format_physical_width(asrc->asrc_format);
257 if (width < 8 || width > 64)
258 return -EINVAL;
259 else if (width == 8)
260 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
261 else if (width == 16)
262 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
263 else if (width == 24)
264 buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES;
265 else if (width <= 32)
266 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
267 else
268 buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES;
269
270 config_be.direction = DMA_DEV_TO_DEV;
271 config_be.src_addr_width = buswidth;
272 config_be.src_maxburst = dma_params_be->maxburst;
273 config_be.dst_addr_width = buswidth;
274 config_be.dst_maxburst = dma_params_be->maxburst;
275
276 if (tx) {
277 config_be.src_addr = asrc->paddr + asrc->get_fifo_addr(OUT, index);
278 config_be.dst_addr = dma_params_be->addr;
279 } else {
280 config_be.dst_addr = asrc->paddr + asrc->get_fifo_addr(IN, index);
281 config_be.src_addr = dma_params_be->addr;
282 }
283
284 ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
285 if (ret) {
286 dev_err(dev, "failed to config DMA channel for Back-End\n");
287 if (pair->req_dma_chan)
288 dma_release_channel(pair->dma_chan[dir]);
289 return ret;
290 }
291
292 return 0;
293 }
294
fsl_asrc_dma_hw_free(struct snd_soc_component * component,struct snd_pcm_substream * substream)295 static int fsl_asrc_dma_hw_free(struct snd_soc_component *component,
296 struct snd_pcm_substream *substream)
297 {
298 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
299 struct snd_pcm_runtime *runtime = substream->runtime;
300 struct fsl_asrc_pair *pair = runtime->private_data;
301 u8 dir = tx ? OUT : IN;
302
303 if (pair->dma_chan[!dir])
304 dma_release_channel(pair->dma_chan[!dir]);
305
306 /* release dev_to_dev chan if we aren't reusing the Back-End one */
307 if (pair->dma_chan[dir] && pair->req_dma_chan)
308 dma_release_channel(pair->dma_chan[dir]);
309
310 pair->dma_chan[!dir] = NULL;
311 pair->dma_chan[dir] = NULL;
312
313 return 0;
314 }
315
fsl_asrc_dma_startup(struct snd_soc_component * component,struct snd_pcm_substream * substream)316 static int fsl_asrc_dma_startup(struct snd_soc_component *component,
317 struct snd_pcm_substream *substream)
318 {
319 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
320 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
321 struct snd_pcm_runtime *runtime = substream->runtime;
322 struct snd_dmaengine_dai_dma_data *dma_data;
323 struct device *dev = component->dev;
324 struct fsl_asrc *asrc = dev_get_drvdata(dev);
325 struct fsl_asrc_pair *pair;
326 struct dma_chan *tmp_chan = NULL;
327 u8 dir = tx ? OUT : IN;
328 bool release_pair = true;
329 int ret = 0;
330
331 ret = snd_pcm_hw_constraint_integer(substream->runtime,
332 SNDRV_PCM_HW_PARAM_PERIODS);
333 if (ret < 0) {
334 dev_err(dev, "failed to set pcm hw params periods\n");
335 return ret;
336 }
337
338 pair = kzalloc(sizeof(*pair) + asrc->pair_priv_size, GFP_KERNEL);
339 if (!pair)
340 return -ENOMEM;
341
342 pair->asrc = asrc;
343 pair->private = (void *)pair + sizeof(struct fsl_asrc_pair);
344
345 runtime->private_data = pair;
346
347 /* Request a dummy pair, which will be released later.
348 * Request pair function needs channel num as input, for this
349 * dummy pair, we just request "1" channel temporarily.
350 */
351 ret = asrc->request_pair(1, pair);
352 if (ret < 0) {
353 dev_err(dev, "failed to request asrc pair\n");
354 goto req_pair_err;
355 }
356
357 /* Request a dummy dma channel, which will be released later. */
358 tmp_chan = asrc->get_dma_channel(pair, dir);
359 if (!tmp_chan) {
360 dev_err(dev, "failed to get dma channel\n");
361 ret = -EINVAL;
362 goto dma_chan_err;
363 }
364
365 dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
366
367 /* Refine the snd_imx_hardware according to caps of DMA. */
368 ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream,
369 dma_data,
370 &snd_imx_hardware,
371 tmp_chan);
372 if (ret < 0) {
373 dev_err(dev, "failed to refine runtime hwparams\n");
374 goto out;
375 }
376
377 release_pair = false;
378 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
379
380 out:
381 dma_release_channel(tmp_chan);
382
383 dma_chan_err:
384 asrc->release_pair(pair);
385
386 req_pair_err:
387 if (release_pair)
388 kfree(pair);
389
390 return ret;
391 }
392
fsl_asrc_dma_shutdown(struct snd_soc_component * component,struct snd_pcm_substream * substream)393 static int fsl_asrc_dma_shutdown(struct snd_soc_component *component,
394 struct snd_pcm_substream *substream)
395 {
396 struct snd_pcm_runtime *runtime = substream->runtime;
397 struct fsl_asrc_pair *pair = runtime->private_data;
398 struct fsl_asrc *asrc;
399
400 if (!pair)
401 return 0;
402
403 asrc = pair->asrc;
404
405 if (asrc->pair[pair->index] == pair)
406 asrc->pair[pair->index] = NULL;
407
408 kfree(pair);
409
410 return 0;
411 }
412
413 static snd_pcm_uframes_t
fsl_asrc_dma_pcm_pointer(struct snd_soc_component * component,struct snd_pcm_substream * substream)414 fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component,
415 struct snd_pcm_substream *substream)
416 {
417 struct snd_pcm_runtime *runtime = substream->runtime;
418 struct fsl_asrc_pair *pair = runtime->private_data;
419
420 return bytes_to_frames(substream->runtime, pair->pos);
421 }
422
fsl_asrc_dma_pcm_new(struct snd_soc_component * component,struct snd_soc_pcm_runtime * rtd)423 static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component,
424 struct snd_soc_pcm_runtime *rtd)
425 {
426 struct snd_card *card = rtd->card->snd_card;
427 struct snd_pcm *pcm = rtd->pcm;
428 int ret;
429
430 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
431 if (ret) {
432 dev_err(card->dev, "failed to set DMA mask\n");
433 return ret;
434 }
435
436 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
437 card->dev, FSL_ASRC_DMABUF_SIZE);
438 }
439
440 struct snd_soc_component_driver fsl_asrc_component = {
441 .name = DRV_NAME,
442 .hw_params = fsl_asrc_dma_hw_params,
443 .hw_free = fsl_asrc_dma_hw_free,
444 .trigger = fsl_asrc_dma_trigger,
445 .open = fsl_asrc_dma_startup,
446 .close = fsl_asrc_dma_shutdown,
447 .pointer = fsl_asrc_dma_pcm_pointer,
448 .pcm_construct = fsl_asrc_dma_pcm_new,
449 };
450 EXPORT_SYMBOL_GPL(fsl_asrc_component);
451