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1// SPDX-License-Identifier: (GPL-2.0 OR MIT)
2//
3// Copyright (c) 2018 BayLibre, SAS.
4// Author: Jerome Brunet <jbrunet@baylibre.com>
5
6#include <linux/clk.h>
7#include <linux/module.h>
8#include <linux/of_platform.h>
9#include <sound/pcm_params.h>
10#include <sound/soc.h>
11#include <sound/soc-dai.h>
12
13#include "axg-tdm.h"
14
15enum {
16 TDM_IFACE_PAD,
17 TDM_IFACE_LOOPBACK,
18};
19
20static unsigned int axg_tdm_slots_total(u32 *mask)
21{
22 unsigned int slots = 0;
23 int i;
24
25 if (!mask)
26 return 0;
27
28 /* Count the total number of slots provided by all 4 lanes */
29 for (i = 0; i < AXG_TDM_NUM_LANES; i++)
30 slots += hweight32(mask[i]);
31
32 return slots;
33}
34
35int axg_tdm_set_tdm_slots(struct snd_soc_dai *dai, u32 *tx_mask,
36 u32 *rx_mask, unsigned int slots,
37 unsigned int slot_width)
38{
39 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
40 struct axg_tdm_stream *tx = (struct axg_tdm_stream *)
41 dai->playback_dma_data;
42 struct axg_tdm_stream *rx = (struct axg_tdm_stream *)
43 dai->capture_dma_data;
44 unsigned int tx_slots, rx_slots;
45 unsigned int fmt = 0;
46
47 tx_slots = axg_tdm_slots_total(tx_mask);
48 rx_slots = axg_tdm_slots_total(rx_mask);
49
50 /* We should at least have a slot for a valid interface */
51 if (!tx_slots && !rx_slots) {
52 dev_err(dai->dev, "interface has no slot\n");
53 return -EINVAL;
54 }
55
56 iface->slots = slots;
57
58 switch (slot_width) {
59 case 0:
60 slot_width = 32;
61 fallthrough;
62 case 32:
63 fmt |= SNDRV_PCM_FMTBIT_S32_LE;
64 fallthrough;
65 case 24:
66 fmt |= SNDRV_PCM_FMTBIT_S24_LE;
67 fmt |= SNDRV_PCM_FMTBIT_S20_LE;
68 fallthrough;
69 case 16:
70 fmt |= SNDRV_PCM_FMTBIT_S16_LE;
71 fallthrough;
72 case 8:
73 fmt |= SNDRV_PCM_FMTBIT_S8;
74 break;
75 default:
76 dev_err(dai->dev, "unsupported slot width: %d\n", slot_width);
77 return -EINVAL;
78 }
79
80 iface->slot_width = slot_width;
81
82 /* Amend the dai driver and let dpcm merge do its job */
83 if (tx) {
84 tx->mask = tx_mask;
85 dai->driver->playback.channels_max = tx_slots;
86 dai->driver->playback.formats = fmt;
87 }
88
89 if (rx) {
90 rx->mask = rx_mask;
91 dai->driver->capture.channels_max = rx_slots;
92 dai->driver->capture.formats = fmt;
93 }
94
95 return 0;
96}
97EXPORT_SYMBOL_GPL(axg_tdm_set_tdm_slots);
98
99static int axg_tdm_iface_set_sysclk(struct snd_soc_dai *dai, int clk_id,
100 unsigned int freq, int dir)
101{
102 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
103 int ret = -ENOTSUPP;
104
105 if (dir == SND_SOC_CLOCK_OUT && clk_id == 0) {
106 if (!iface->mclk) {
107 dev_warn(dai->dev, "master clock not provided\n");
108 } else {
109 ret = clk_set_rate(iface->mclk, freq);
110 if (!ret)
111 iface->mclk_rate = freq;
112 }
113 }
114
115 return ret;
116}
117
118static int axg_tdm_iface_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
119{
120 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
121
122 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
123 case SND_SOC_DAIFMT_BP_FP:
124 if (!iface->mclk) {
125 dev_err(dai->dev, "cpu clock master: mclk missing\n");
126 return -ENODEV;
127 }
128 break;
129
130 case SND_SOC_DAIFMT_BC_FC:
131 break;
132
133 case SND_SOC_DAIFMT_BP_FC:
134 case SND_SOC_DAIFMT_BC_FP:
135 dev_err(dai->dev, "only CBS_CFS and CBM_CFM are supported\n");
136 fallthrough;
137 default:
138 return -EINVAL;
139 }
140
141 iface->fmt = fmt;
142 return 0;
143}
144
145static int axg_tdm_iface_startup(struct snd_pcm_substream *substream,
146 struct snd_soc_dai *dai)
147{
148 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
149 struct axg_tdm_stream *ts =
150 snd_soc_dai_get_dma_data(dai, substream);
151 int ret;
152
153 if (!axg_tdm_slots_total(ts->mask)) {
154 dev_err(dai->dev, "interface has not slots\n");
155 return -EINVAL;
156 }
157
158 /* Apply component wide rate symmetry */
159 if (snd_soc_component_active(dai->component)) {
160 ret = snd_pcm_hw_constraint_single(substream->runtime,
161 SNDRV_PCM_HW_PARAM_RATE,
162 iface->rate);
163 if (ret < 0) {
164 dev_err(dai->dev,
165 "can't set iface rate constraint\n");
166 return ret;
167 }
168 }
169
170 return 0;
171}
172
173static int axg_tdm_iface_set_stream(struct snd_pcm_substream *substream,
174 struct snd_pcm_hw_params *params,
175 struct snd_soc_dai *dai)
176{
177 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
178 struct axg_tdm_stream *ts = snd_soc_dai_get_dma_data(dai, substream);
179 unsigned int channels = params_channels(params);
180 unsigned int width = params_width(params);
181
182 /* Save rate and sample_bits for component symmetry */
183 iface->rate = params_rate(params);
184
185 /* Make sure this interface can cope with the stream */
186 if (axg_tdm_slots_total(ts->mask) < channels) {
187 dev_err(dai->dev, "not enough slots for channels\n");
188 return -EINVAL;
189 }
190
191 if (iface->slot_width < width) {
192 dev_err(dai->dev, "incompatible slots width for stream\n");
193 return -EINVAL;
194 }
195
196 /* Save the parameter for tdmout/tdmin widgets */
197 ts->physical_width = params_physical_width(params);
198 ts->width = params_width(params);
199 ts->channels = params_channels(params);
200
201 return 0;
202}
203
204static int axg_tdm_iface_set_lrclk(struct snd_soc_dai *dai,
205 struct snd_pcm_hw_params *params)
206{
207 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
208 unsigned int ratio_num;
209 int ret;
210
211 ret = clk_set_rate(iface->lrclk, params_rate(params));
212 if (ret) {
213 dev_err(dai->dev, "setting sample clock failed: %d\n", ret);
214 return ret;
215 }
216
217 switch (iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
218 case SND_SOC_DAIFMT_I2S:
219 case SND_SOC_DAIFMT_LEFT_J:
220 case SND_SOC_DAIFMT_RIGHT_J:
221 /* 50% duty cycle ratio */
222 ratio_num = 1;
223 break;
224
225 case SND_SOC_DAIFMT_DSP_A:
226 case SND_SOC_DAIFMT_DSP_B:
227 /*
228 * A zero duty cycle ratio will result in setting the mininum
229 * ratio possible which, for this clock, is 1 cycle of the
230 * parent bclk clock high and the rest low, This is exactly
231 * what we want here.
232 */
233 ratio_num = 0;
234 break;
235
236 default:
237 return -EINVAL;
238 }
239
240 ret = clk_set_duty_cycle(iface->lrclk, ratio_num, 2);
241 if (ret) {
242 dev_err(dai->dev,
243 "setting sample clock duty cycle failed: %d\n", ret);
244 return ret;
245 }
246
247 /* Set sample clock inversion */
248 ret = clk_set_phase(iface->lrclk,
249 axg_tdm_lrclk_invert(iface->fmt) ? 180 : 0);
250 if (ret) {
251 dev_err(dai->dev,
252 "setting sample clock phase failed: %d\n", ret);
253 return ret;
254 }
255
256 return 0;
257}
258
259static int axg_tdm_iface_set_sclk(struct snd_soc_dai *dai,
260 struct snd_pcm_hw_params *params)
261{
262 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
263 unsigned long srate;
264 int ret;
265
266 srate = iface->slots * iface->slot_width * params_rate(params);
267
268 if (!iface->mclk_rate) {
269 /* If no specific mclk is requested, default to bit clock * 4 */
270 clk_set_rate(iface->mclk, 4 * srate);
271 } else {
272 /* Check if we can actually get the bit clock from mclk */
273 if (iface->mclk_rate % srate) {
274 dev_err(dai->dev,
275 "can't derive sclk %lu from mclk %lu\n",
276 srate, iface->mclk_rate);
277 return -EINVAL;
278 }
279 }
280
281 ret = clk_set_rate(iface->sclk, srate);
282 if (ret) {
283 dev_err(dai->dev, "setting bit clock failed: %d\n", ret);
284 return ret;
285 }
286
287 /* Set the bit clock inversion */
288 ret = clk_set_phase(iface->sclk,
289 axg_tdm_sclk_invert(iface->fmt) ? 0 : 180);
290 if (ret) {
291 dev_err(dai->dev, "setting bit clock phase failed: %d\n", ret);
292 return ret;
293 }
294
295 return ret;
296}
297
298static int axg_tdm_iface_hw_params(struct snd_pcm_substream *substream,
299 struct snd_pcm_hw_params *params,
300 struct snd_soc_dai *dai)
301{
302 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
303 int ret;
304
305 switch (iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
306 case SND_SOC_DAIFMT_I2S:
307 case SND_SOC_DAIFMT_LEFT_J:
308 case SND_SOC_DAIFMT_RIGHT_J:
309 if (iface->slots > 2) {
310 dev_err(dai->dev, "bad slot number for format: %d\n",
311 iface->slots);
312 return -EINVAL;
313 }
314 break;
315
316 case SND_SOC_DAIFMT_DSP_A:
317 case SND_SOC_DAIFMT_DSP_B:
318 break;
319
320 default:
321 dev_err(dai->dev, "unsupported dai format\n");
322 return -EINVAL;
323 }
324
325 ret = axg_tdm_iface_set_stream(substream, params, dai);
326 if (ret)
327 return ret;
328
329 if ((iface->fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) ==
330 SND_SOC_DAIFMT_BP_FP) {
331 ret = axg_tdm_iface_set_sclk(dai, params);
332 if (ret)
333 return ret;
334
335 ret = axg_tdm_iface_set_lrclk(dai, params);
336 if (ret)
337 return ret;
338 }
339
340 return 0;
341}
342
343static int axg_tdm_iface_hw_free(struct snd_pcm_substream *substream,
344 struct snd_soc_dai *dai)
345{
346 struct axg_tdm_stream *ts = snd_soc_dai_get_dma_data(dai, substream);
347
348 /* Stop all attached formatters */
349 axg_tdm_stream_stop(ts);
350
351 return 0;
352}
353
354static int axg_tdm_iface_prepare(struct snd_pcm_substream *substream,
355 struct snd_soc_dai *dai)
356{
357 struct axg_tdm_stream *ts = snd_soc_dai_get_dma_data(dai, substream);
358
359 /* Force all attached formatters to update */
360 return axg_tdm_stream_reset(ts);
361}
362
363static int axg_tdm_iface_remove_dai(struct snd_soc_dai *dai)
364{
365 if (dai->capture_dma_data)
366 axg_tdm_stream_free(dai->capture_dma_data);
367
368 if (dai->playback_dma_data)
369 axg_tdm_stream_free(dai->playback_dma_data);
370
371 return 0;
372}
373
374static int axg_tdm_iface_probe_dai(struct snd_soc_dai *dai)
375{
376 struct axg_tdm_iface *iface = snd_soc_dai_get_drvdata(dai);
377
378 if (dai->capture_widget) {
379 dai->capture_dma_data = axg_tdm_stream_alloc(iface);
380 if (!dai->capture_dma_data)
381 return -ENOMEM;
382 }
383
384 if (dai->playback_widget) {
385 dai->playback_dma_data = axg_tdm_stream_alloc(iface);
386 if (!dai->playback_dma_data) {
387 axg_tdm_iface_remove_dai(dai);
388 return -ENOMEM;
389 }
390 }
391
392 return 0;
393}
394
395static const struct snd_soc_dai_ops axg_tdm_iface_ops = {
396 .set_sysclk = axg_tdm_iface_set_sysclk,
397 .set_fmt = axg_tdm_iface_set_fmt,
398 .startup = axg_tdm_iface_startup,
399 .hw_params = axg_tdm_iface_hw_params,
400 .prepare = axg_tdm_iface_prepare,
401 .hw_free = axg_tdm_iface_hw_free,
402};
403
404/* TDM Backend DAIs */
405static const struct snd_soc_dai_driver axg_tdm_iface_dai_drv[] = {
406 [TDM_IFACE_PAD] = {
407 .name = "TDM Pad",
408 .playback = {
409 .stream_name = "Playback",
410 .channels_min = 1,
411 .channels_max = AXG_TDM_CHANNEL_MAX,
412 .rates = AXG_TDM_RATES,
413 .formats = AXG_TDM_FORMATS,
414 },
415 .capture = {
416 .stream_name = "Capture",
417 .channels_min = 1,
418 .channels_max = AXG_TDM_CHANNEL_MAX,
419 .rates = AXG_TDM_RATES,
420 .formats = AXG_TDM_FORMATS,
421 },
422 .id = TDM_IFACE_PAD,
423 .ops = &axg_tdm_iface_ops,
424 .probe = axg_tdm_iface_probe_dai,
425 .remove = axg_tdm_iface_remove_dai,
426 },
427 [TDM_IFACE_LOOPBACK] = {
428 .name = "TDM Loopback",
429 .capture = {
430 .stream_name = "Loopback",
431 .channels_min = 1,
432 .channels_max = AXG_TDM_CHANNEL_MAX,
433 .rates = AXG_TDM_RATES,
434 .formats = AXG_TDM_FORMATS,
435 },
436 .id = TDM_IFACE_LOOPBACK,
437 .ops = &axg_tdm_iface_ops,
438 .probe = axg_tdm_iface_probe_dai,
439 .remove = axg_tdm_iface_remove_dai,
440 },
441};
442
443static int axg_tdm_iface_set_bias_level(struct snd_soc_component *component,
444 enum snd_soc_bias_level level)
445{
446 struct axg_tdm_iface *iface = snd_soc_component_get_drvdata(component);
447 enum snd_soc_bias_level now =
448 snd_soc_component_get_bias_level(component);
449 int ret = 0;
450
451 switch (level) {
452 case SND_SOC_BIAS_PREPARE:
453 if (now == SND_SOC_BIAS_STANDBY)
454 ret = clk_prepare_enable(iface->mclk);
455 break;
456
457 case SND_SOC_BIAS_STANDBY:
458 if (now == SND_SOC_BIAS_PREPARE)
459 clk_disable_unprepare(iface->mclk);
460 break;
461
462 case SND_SOC_BIAS_OFF:
463 case SND_SOC_BIAS_ON:
464 break;
465 }
466
467 return ret;
468}
469
470static const struct snd_soc_dapm_widget axg_tdm_iface_dapm_widgets[] = {
471 SND_SOC_DAPM_SIGGEN("Playback Signal"),
472};
473
474static const struct snd_soc_dapm_route axg_tdm_iface_dapm_routes[] = {
475 { "Loopback", NULL, "Playback Signal" },
476};
477
478static const struct snd_soc_component_driver axg_tdm_iface_component_drv = {
479 .dapm_widgets = axg_tdm_iface_dapm_widgets,
480 .num_dapm_widgets = ARRAY_SIZE(axg_tdm_iface_dapm_widgets),
481 .dapm_routes = axg_tdm_iface_dapm_routes,
482 .num_dapm_routes = ARRAY_SIZE(axg_tdm_iface_dapm_routes),
483 .set_bias_level = axg_tdm_iface_set_bias_level,
484};
485
486static const struct of_device_id axg_tdm_iface_of_match[] = {
487 { .compatible = "amlogic,axg-tdm-iface", },
488 {}
489};
490MODULE_DEVICE_TABLE(of, axg_tdm_iface_of_match);
491
492static int axg_tdm_iface_probe(struct platform_device *pdev)
493{
494 struct device *dev = &pdev->dev;
495 struct snd_soc_dai_driver *dai_drv;
496 struct axg_tdm_iface *iface;
497 int ret, i;
498
499 iface = devm_kzalloc(dev, sizeof(*iface), GFP_KERNEL);
500 if (!iface)
501 return -ENOMEM;
502 platform_set_drvdata(pdev, iface);
503
504 /*
505 * Duplicate dai driver: depending on the slot masks configuration
506 * We'll change the number of channel provided by DAI stream, so dpcm
507 * channel merge can be done properly
508 */
509 dai_drv = devm_kcalloc(dev, ARRAY_SIZE(axg_tdm_iface_dai_drv),
510 sizeof(*dai_drv), GFP_KERNEL);
511 if (!dai_drv)
512 return -ENOMEM;
513
514 for (i = 0; i < ARRAY_SIZE(axg_tdm_iface_dai_drv); i++)
515 memcpy(&dai_drv[i], &axg_tdm_iface_dai_drv[i],
516 sizeof(*dai_drv));
517
518 /* Bit clock provided on the pad */
519 iface->sclk = devm_clk_get(dev, "sclk");
520 if (IS_ERR(iface->sclk))
521 return dev_err_probe(dev, PTR_ERR(iface->sclk), "failed to get sclk\n");
522
523 /* Sample clock provided on the pad */
524 iface->lrclk = devm_clk_get(dev, "lrclk");
525 if (IS_ERR(iface->lrclk))
526 return dev_err_probe(dev, PTR_ERR(iface->lrclk), "failed to get lrclk\n");
527
528 /*
529 * mclk maybe be missing when the cpu dai is in slave mode and
530 * the codec does not require it to provide a master clock.
531 * At this point, ignore the error if mclk is missing. We'll
532 * throw an error if the cpu dai is master and mclk is missing
533 */
534 iface->mclk = devm_clk_get(dev, "mclk");
535 if (IS_ERR(iface->mclk)) {
536 ret = PTR_ERR(iface->mclk);
537 if (ret == -ENOENT)
538 iface->mclk = NULL;
539 else
540 return dev_err_probe(dev, ret, "failed to get mclk\n");
541 }
542
543 return devm_snd_soc_register_component(dev,
544 &axg_tdm_iface_component_drv, dai_drv,
545 ARRAY_SIZE(axg_tdm_iface_dai_drv));
546}
547
548static struct platform_driver axg_tdm_iface_pdrv = {
549 .probe = axg_tdm_iface_probe,
550 .driver = {
551 .name = "axg-tdm-iface",
552 .of_match_table = axg_tdm_iface_of_match,
553 },
554};
555module_platform_driver(axg_tdm_iface_pdrv);
556
557MODULE_DESCRIPTION("Amlogic AXG TDM interface driver");
558MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
559MODULE_LICENSE("GPL v2");