1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2019 Spreadtrum Communications Inc. |
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 | |
20 | struct 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 | |
29 | struct 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 | |
37 | static 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 | |
49 | static 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, hw: &sprd_pcm_hardware); |
59 | |
60 | ret = snd_pcm_hw_constraint_step(runtime, cond: 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, cond: 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, size: 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, dma_handle: &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 | |
100 | error: |
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, vaddr: data->virt, dma_handle: data->phys); |
106 | } |
107 | |
108 | devm_kfree(dev, p: dma_private); |
109 | return ret; |
110 | } |
111 | |
112 | static 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, vaddr: data->virt, dma_handle: data->phys); |
125 | } |
126 | |
127 | devm_kfree(dev, p: dma_private); |
128 | |
129 | return 0; |
130 | } |
131 | |
132 | static 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 | |
140 | static 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(chan: data->chan); |
151 | data->chan = NULL; |
152 | } |
153 | } |
154 | } |
155 | |
156 | static 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 | name: 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 | |
187 | static 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 = snd_soc_substream_to_rtd(substream); |
194 | struct sprd_pcm_dma_params *dma_params; |
195 | size_t totsize = params_buffer_bytes(p: params); |
196 | size_t period = params_period_bytes(p: params); |
197 | int channels = params_channels(p: 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(snd_soc_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 | return 0; |
208 | } |
209 | |
210 | if (!dma_private->params) { |
211 | dma_private->params = dma_params; |
212 | ret = sprd_pcm_request_dma_channel(component, |
213 | substream, channels); |
214 | if (ret) |
215 | return ret; |
216 | } |
217 | |
218 | sg_num = totsize / period; |
219 | dma_private->dma_addr_offset = totsize / channels; |
220 | |
221 | sg = devm_kcalloc(dev: component->dev, n: sg_num, size: sizeof(*sg), GFP_KERNEL); |
222 | if (!sg) { |
223 | ret = -ENOMEM; |
224 | goto sg_err; |
225 | } |
226 | |
227 | for (i = 0; i < channels; i++) { |
228 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
229 | struct dma_chan *chan = data->chan; |
230 | struct dma_slave_config config = { }; |
231 | struct sprd_dma_linklist link = { }; |
232 | enum dma_transfer_direction dir; |
233 | struct scatterlist *sgt = sg; |
234 | |
235 | config.src_maxburst = dma_params->fragment_len[i]; |
236 | config.src_addr_width = dma_params->datawidth[i]; |
237 | config.dst_addr_width = dma_params->datawidth[i]; |
238 | if (is_playback) { |
239 | config.src_addr = runtime->dma_addr + |
240 | i * dma_private->dma_addr_offset; |
241 | config.dst_addr = dma_params->dev_phys[i]; |
242 | dir = DMA_MEM_TO_DEV; |
243 | } else { |
244 | config.src_addr = dma_params->dev_phys[i]; |
245 | config.dst_addr = runtime->dma_addr + |
246 | i * dma_private->dma_addr_offset; |
247 | dir = DMA_DEV_TO_MEM; |
248 | } |
249 | |
250 | sg_init_table(sgt, sg_num); |
251 | for (j = 0; j < sg_num; j++, sgt++) { |
252 | u32 sg_len = period / channels; |
253 | |
254 | sg_dma_len(sgt) = sg_len; |
255 | sg_dma_address(sgt) = runtime->dma_addr + |
256 | i * dma_private->dma_addr_offset + sg_len * j; |
257 | } |
258 | |
259 | /* |
260 | * Configure the link-list address for the DMA engine link-list |
261 | * mode. |
262 | */ |
263 | link.virt_addr = (unsigned long)data->virt; |
264 | link.phy_addr = data->phys; |
265 | |
266 | ret = dmaengine_slave_config(chan, config: &config); |
267 | if (ret) { |
268 | dev_err(component->dev, |
269 | "failed to set slave configuration: %d\n" , ret); |
270 | goto config_err; |
271 | } |
272 | |
273 | /* |
274 | * We configure the DMA request mode, interrupt mode, channel |
275 | * mode and channel trigger mode by the flags. |
276 | */ |
277 | flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG, |
278 | SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT); |
279 | data->desc = chan->device->device_prep_slave_sg(chan, sg, |
280 | sg_num, dir, |
281 | flags, &link); |
282 | if (!data->desc) { |
283 | dev_err(component->dev, "failed to prepare slave sg\n" ); |
284 | ret = -ENOMEM; |
285 | goto config_err; |
286 | } |
287 | |
288 | if (!runtime->no_period_wakeup) { |
289 | data->desc->callback = sprd_pcm_dma_complete; |
290 | data->desc->callback_param = dma_private; |
291 | } |
292 | } |
293 | |
294 | devm_kfree(dev: component->dev, p: sg); |
295 | |
296 | return 0; |
297 | |
298 | config_err: |
299 | devm_kfree(dev: component->dev, p: sg); |
300 | sg_err: |
301 | sprd_pcm_release_dma_channel(substream); |
302 | return ret; |
303 | } |
304 | |
305 | static int sprd_pcm_hw_free(struct snd_soc_component *component, |
306 | struct snd_pcm_substream *substream) |
307 | { |
308 | sprd_pcm_release_dma_channel(substream); |
309 | |
310 | return 0; |
311 | } |
312 | |
313 | static int sprd_pcm_trigger(struct snd_soc_component *component, |
314 | struct snd_pcm_substream *substream, int cmd) |
315 | { |
316 | struct sprd_pcm_dma_private *dma_private = |
317 | substream->runtime->private_data; |
318 | int ret = 0, i; |
319 | |
320 | switch (cmd) { |
321 | case SNDRV_PCM_TRIGGER_START: |
322 | for (i = 0; i < dma_private->hw_chan; i++) { |
323 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
324 | |
325 | if (!data->desc) |
326 | continue; |
327 | |
328 | data->cookie = dmaengine_submit(desc: data->desc); |
329 | ret = dma_submit_error(cookie: data->cookie); |
330 | if (ret) { |
331 | dev_err(component->dev, |
332 | "failed to submit dma request: %d\n" , |
333 | ret); |
334 | return ret; |
335 | } |
336 | |
337 | dma_async_issue_pending(chan: data->chan); |
338 | } |
339 | |
340 | break; |
341 | case SNDRV_PCM_TRIGGER_RESUME: |
342 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
343 | for (i = 0; i < dma_private->hw_chan; i++) { |
344 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
345 | |
346 | if (data->chan) |
347 | dmaengine_resume(chan: data->chan); |
348 | } |
349 | |
350 | break; |
351 | case SNDRV_PCM_TRIGGER_STOP: |
352 | for (i = 0; i < dma_private->hw_chan; i++) { |
353 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
354 | |
355 | if (data->chan) |
356 | dmaengine_terminate_async(chan: data->chan); |
357 | } |
358 | |
359 | break; |
360 | case SNDRV_PCM_TRIGGER_SUSPEND: |
361 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
362 | for (i = 0; i < dma_private->hw_chan; i++) { |
363 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
364 | |
365 | if (data->chan) |
366 | dmaengine_pause(chan: data->chan); |
367 | } |
368 | |
369 | break; |
370 | default: |
371 | ret = -EINVAL; |
372 | } |
373 | |
374 | return ret; |
375 | } |
376 | |
377 | static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_soc_component *component, |
378 | struct snd_pcm_substream *substream) |
379 | { |
380 | struct snd_pcm_runtime *runtime = substream->runtime; |
381 | struct sprd_pcm_dma_private *dma_private = runtime->private_data; |
382 | int pointer[SPRD_PCM_CHANNEL_MAX]; |
383 | int bytes_of_pointer = 0, sel_max = 0, i; |
384 | snd_pcm_uframes_t x; |
385 | struct dma_tx_state state; |
386 | enum dma_status status; |
387 | |
388 | for (i = 0; i < dma_private->hw_chan; i++) { |
389 | struct sprd_pcm_dma_data *data = &dma_private->data[i]; |
390 | |
391 | if (!data->chan) |
392 | continue; |
393 | |
394 | status = dmaengine_tx_status(chan: data->chan, cookie: data->cookie, state: &state); |
395 | if (status == DMA_ERROR) { |
396 | dev_err(component->dev, |
397 | "failed to get dma channel %d status\n" , i); |
398 | return 0; |
399 | } |
400 | |
401 | /* |
402 | * We just get current transfer address from the DMA engine, so |
403 | * we need convert to current pointer. |
404 | */ |
405 | pointer[i] = state.residue - runtime->dma_addr - |
406 | i * dma_private->dma_addr_offset; |
407 | |
408 | if (i == 0) { |
409 | bytes_of_pointer = pointer[i]; |
410 | sel_max = pointer[i] < data->pre_pointer ? 1 : 0; |
411 | } else { |
412 | sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0; |
413 | |
414 | if (sel_max) |
415 | bytes_of_pointer = |
416 | max(pointer[i], pointer[i - 1]) << 1; |
417 | else |
418 | bytes_of_pointer = |
419 | min(pointer[i], pointer[i - 1]) << 1; |
420 | } |
421 | |
422 | data->pre_pointer = pointer[i]; |
423 | } |
424 | |
425 | x = bytes_to_frames(runtime, size: bytes_of_pointer); |
426 | if (x == runtime->buffer_size) |
427 | x = 0; |
428 | |
429 | return x; |
430 | } |
431 | |
432 | static int sprd_pcm_new(struct snd_soc_component *component, |
433 | struct snd_soc_pcm_runtime *rtd) |
434 | { |
435 | struct snd_card *card = rtd->card->snd_card; |
436 | struct snd_pcm *pcm = rtd->pcm; |
437 | int ret; |
438 | |
439 | ret = dma_coerce_mask_and_coherent(dev: card->dev, DMA_BIT_MASK(32)); |
440 | if (ret) |
441 | return ret; |
442 | |
443 | return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, |
444 | data: card->dev, |
445 | size: sprd_pcm_hardware.buffer_bytes_max); |
446 | } |
447 | |
448 | static const struct snd_soc_component_driver sprd_soc_component = { |
449 | .name = DRV_NAME, |
450 | .open = sprd_pcm_open, |
451 | .close = sprd_pcm_close, |
452 | .hw_params = sprd_pcm_hw_params, |
453 | .hw_free = sprd_pcm_hw_free, |
454 | .trigger = sprd_pcm_trigger, |
455 | .pointer = sprd_pcm_pointer, |
456 | .pcm_construct = sprd_pcm_new, |
457 | .compress_ops = &sprd_platform_compress_ops, |
458 | }; |
459 | |
460 | static int sprd_soc_platform_probe(struct platform_device *pdev) |
461 | { |
462 | struct device_node *np = pdev->dev.of_node; |
463 | int ret; |
464 | |
465 | ret = of_reserved_mem_device_init_by_idx(dev: &pdev->dev, np, idx: 0); |
466 | if (ret) |
467 | dev_warn(&pdev->dev, |
468 | "no reserved DMA memory for audio platform device\n" ); |
469 | |
470 | ret = devm_snd_soc_register_component(dev: &pdev->dev, component_driver: &sprd_soc_component, |
471 | NULL, num_dai: 0); |
472 | if (ret) |
473 | dev_err(&pdev->dev, "could not register platform:%d\n" , ret); |
474 | |
475 | return ret; |
476 | } |
477 | |
478 | static const struct of_device_id sprd_pcm_of_match[] = { |
479 | { .compatible = "sprd,pcm-platform" , }, |
480 | { }, |
481 | }; |
482 | MODULE_DEVICE_TABLE(of, sprd_pcm_of_match); |
483 | |
484 | static struct platform_driver sprd_pcm_driver = { |
485 | .driver = { |
486 | .name = "sprd-pcm-audio" , |
487 | .of_match_table = sprd_pcm_of_match, |
488 | }, |
489 | |
490 | .probe = sprd_soc_platform_probe, |
491 | }; |
492 | |
493 | module_platform_driver(sprd_pcm_driver); |
494 | |
495 | MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA" ); |
496 | MODULE_LICENSE("GPL v2" ); |
497 | MODULE_ALIAS("platform:sprd-audio" ); |
498 | |