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/module.h>
7 #include <linux/of_platform.h>
8 #include <sound/soc.h>
9 #include <sound/soc-dai.h>
10
11 #include "axg-tdm.h"
12 #include "meson-card.h"
13
14 struct axg_dai_link_tdm_mask {
15 u32 tx;
16 u32 rx;
17 };
18
19 struct axg_dai_link_tdm_data {
20 unsigned int mclk_fs;
21 unsigned int slots;
22 unsigned int slot_width;
23 u32 *tx_mask;
24 u32 *rx_mask;
25 struct axg_dai_link_tdm_mask *codec_masks;
26 };
27
28 /*
29 * Base params for the codec to codec links
30 * Those will be over-written by the CPU side of the link
31 */
32 static const struct snd_soc_pcm_stream codec_params = {
33 .formats = SNDRV_PCM_FMTBIT_S24_LE,
34 .rate_min = 5525,
35 .rate_max = 192000,
36 .channels_min = 1,
37 .channels_max = 8,
38 };
39
40 static int axg_card_tdm_be_hw_params(struct snd_pcm_substream *substream,
41 struct snd_pcm_hw_params *params)
42 {
43 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
44 struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
45 struct axg_dai_link_tdm_data *be =
46 (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
47
48 return meson_card_i2s_set_sysclk(substream, params, be->mclk_fs);
49 }
50
51 static const struct snd_soc_ops axg_card_tdm_be_ops = {
52 .hw_params = axg_card_tdm_be_hw_params,
53 };
54
55 static int axg_card_tdm_dai_init(struct snd_soc_pcm_runtime *rtd)
56 {
57 struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
58 struct axg_dai_link_tdm_data *be =
59 (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
60 struct snd_soc_dai *codec_dai;
61 int ret, i;
62
63 for_each_rtd_codec_dais(rtd, i, codec_dai) {
64 ret = snd_soc_dai_set_tdm_slot(codec_dai,
65 be->codec_masks[i].tx,
66 be->codec_masks[i].rx,
67 be->slots, be->slot_width);
68 if (ret && ret != -ENOTSUPP) {
69 dev_err(codec_dai->dev,
70 "setting tdm link slots failed\n");
71 return ret;
72 }
73 }
74
75 ret = axg_tdm_set_tdm_slots(snd_soc_rtd_to_cpu(rtd, 0), be->tx_mask, be->rx_mask,
76 be->slots, be->slot_width);
77 if (ret) {
78 dev_err(snd_soc_rtd_to_cpu(rtd, 0)->dev, "setting tdm link slots failed\n");
79 return ret;
80 }
81
82 return 0;
83 }
84
85 static int axg_card_tdm_dai_lb_init(struct snd_soc_pcm_runtime *rtd)
86 {
87 struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
88 struct axg_dai_link_tdm_data *be =
89 (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
90 int ret;
91
92 /* The loopback rx_mask is the pad tx_mask */
93 ret = axg_tdm_set_tdm_slots(snd_soc_rtd_to_cpu(rtd, 0), NULL, be->tx_mask,
94 be->slots, be->slot_width);
95 if (ret) {
96 dev_err(snd_soc_rtd_to_cpu(rtd, 0)->dev, "setting tdm link slots failed\n");
97 return ret;
98 }
99
100 return 0;
101 }
102
103 static int axg_card_add_tdm_loopback(struct snd_soc_card *card,
104 int *index)
105 {
106 struct meson_card *priv = snd_soc_card_get_drvdata(card);
107 struct snd_soc_dai_link *pad = &card->dai_link[*index];
108 struct snd_soc_dai_link *lb;
109 struct snd_soc_dai_link_component *dlc;
110 int ret;
111
112 /* extend links */
113 ret = meson_card_reallocate_links(card, card->num_links + 1);
114 if (ret)
115 return ret;
116
117 lb = &card->dai_link[*index + 1];
118
119 lb->name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-lb", pad->name);
120 if (!lb->name)
121 return -ENOMEM;
122
123 dlc = devm_kzalloc(card->dev, sizeof(*dlc), GFP_KERNEL);
124 if (!dlc)
125 return -ENOMEM;
126
127 lb->cpus = dlc;
128 lb->codecs = &snd_soc_dummy_dlc;
129 lb->num_cpus = 1;
130 lb->num_codecs = 1;
131
132 lb->stream_name = lb->name;
133 lb->cpus->of_node = pad->cpus->of_node;
134 lb->cpus->dai_name = "TDM Loopback";
135 lb->dpcm_capture = 1;
136 lb->no_pcm = 1;
137 lb->ops = &axg_card_tdm_be_ops;
138 lb->init = axg_card_tdm_dai_lb_init;
139
140 /* Provide the same link data to the loopback */
141 priv->link_data[*index + 1] = priv->link_data[*index];
142
143 /*
144 * axg_card_clean_references() will iterate over this link,
145 * make sure the node count is balanced
146 */
147 of_node_get(lb->cpus->of_node);
148
149 /* Let add_links continue where it should */
150 *index += 1;
151
152 return 0;
153 }
154
155 static int axg_card_parse_cpu_tdm_slots(struct snd_soc_card *card,
156 struct snd_soc_dai_link *link,
157 struct device_node *node,
158 struct axg_dai_link_tdm_data *be)
159 {
160 char propname[32];
161 u32 tx, rx;
162 int i;
163
164 be->tx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
165 sizeof(*be->tx_mask), GFP_KERNEL);
166 be->rx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
167 sizeof(*be->rx_mask), GFP_KERNEL);
168 if (!be->tx_mask || !be->rx_mask)
169 return -ENOMEM;
170
171 for (i = 0, tx = 0; i < AXG_TDM_NUM_LANES; i++) {
172 snprintf(propname, 32, "dai-tdm-slot-tx-mask-%d", i);
173 snd_soc_of_get_slot_mask(node, propname, &be->tx_mask[i]);
174 tx = max(tx, be->tx_mask[i]);
175 }
176
177 /* Disable playback is the interface has no tx slots */
178 if (!tx)
179 link->dpcm_playback = 0;
180
181 for (i = 0, rx = 0; i < AXG_TDM_NUM_LANES; i++) {
182 snprintf(propname, 32, "dai-tdm-slot-rx-mask-%d", i);
183 snd_soc_of_get_slot_mask(node, propname, &be->rx_mask[i]);
184 rx = max(rx, be->rx_mask[i]);
185 }
186
187 /* Disable capture is the interface has no rx slots */
188 if (!rx)
189 link->dpcm_capture = 0;
190
191 /* ... but the interface should at least have one of them */
192 if (!tx && !rx) {
193 dev_err(card->dev, "tdm link has no cpu slots\n");
194 return -EINVAL;
195 }
196
197 of_property_read_u32(node, "dai-tdm-slot-num", &be->slots);
198 if (!be->slots) {
199 /*
200 * If the slot number is not provided, set it such as it
201 * accommodates the largest mask
202 */
203 be->slots = fls(max(tx, rx));
204 } else if (be->slots < fls(max(tx, rx)) || be->slots > 32) {
205 /*
206 * Error if the slots can't accommodate the largest mask or
207 * if it is just too big
208 */
209 dev_err(card->dev, "bad slot number\n");
210 return -EINVAL;
211 }
212
213 of_property_read_u32(node, "dai-tdm-slot-width", &be->slot_width);
214
215 return 0;
216 }
217
218 static int axg_card_parse_codecs_masks(struct snd_soc_card *card,
219 struct snd_soc_dai_link *link,
220 struct device_node *node,
221 struct axg_dai_link_tdm_data *be)
222 {
223 struct axg_dai_link_tdm_mask *codec_mask;
224 struct device_node *np;
225
226 codec_mask = devm_kcalloc(card->dev, link->num_codecs,
227 sizeof(*codec_mask), GFP_KERNEL);
228 if (!codec_mask)
229 return -ENOMEM;
230
231 be->codec_masks = codec_mask;
232
233 for_each_child_of_node(node, np) {
234 snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask",
235 &codec_mask->rx);
236 snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask",
237 &codec_mask->tx);
238
239 codec_mask++;
240 }
241
242 return 0;
243 }
244
245 static int axg_card_parse_tdm(struct snd_soc_card *card,
246 struct device_node *node,
247 int *index)
248 {
249 struct meson_card *priv = snd_soc_card_get_drvdata(card);
250 struct snd_soc_dai_link *link = &card->dai_link[*index];
251 struct axg_dai_link_tdm_data *be;
252 int ret;
253
254 /* Allocate tdm link parameters */
255 be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL);
256 if (!be)
257 return -ENOMEM;
258 priv->link_data[*index] = be;
259
260 /* Setup tdm link */
261 link->ops = &axg_card_tdm_be_ops;
262 link->init = axg_card_tdm_dai_init;
263 link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node);
264
265 of_property_read_u32(node, "mclk-fs", &be->mclk_fs);
266
267 ret = axg_card_parse_cpu_tdm_slots(card, link, node, be);
268 if (ret) {
269 dev_err(card->dev, "error parsing tdm link slots\n");
270 return ret;
271 }
272
273 ret = axg_card_parse_codecs_masks(card, link, node, be);
274 if (ret)
275 return ret;
276
277 /* Add loopback if the pad dai has playback */
278 if (link->dpcm_playback) {
279 ret = axg_card_add_tdm_loopback(card, index);
280 if (ret)
281 return ret;
282 }
283
284 return 0;
285 }
286
287 static int axg_card_cpu_is_capture_fe(struct device_node *np)
288 {
289 return of_device_is_compatible(np, DT_PREFIX "axg-toddr");
290 }
291
292 static int axg_card_cpu_is_playback_fe(struct device_node *np)
293 {
294 return of_device_is_compatible(np, DT_PREFIX "axg-frddr");
295 }
296
297 static int axg_card_cpu_is_tdm_iface(struct device_node *np)
298 {
299 return of_device_is_compatible(np, DT_PREFIX "axg-tdm-iface");
300 }
301
302 static int axg_card_cpu_is_codec(struct device_node *np)
303 {
304 return of_device_is_compatible(np, DT_PREFIX "g12a-tohdmitx") ||
305 of_device_is_compatible(np, DT_PREFIX "g12a-toacodec");
306 }
307
308 static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np,
309 int *index)
310 {
311 struct snd_soc_dai_link *dai_link = &card->dai_link[*index];
312 struct snd_soc_dai_link_component *cpu;
313 int ret;
314
315 cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL);
316 if (!cpu)
317 return -ENOMEM;
318
319 dai_link->cpus = cpu;
320 dai_link->num_cpus = 1;
321 dai_link->nonatomic = true;
322
323 ret = meson_card_parse_dai(card, np, dai_link->cpus);
324 if (ret)
325 return ret;
326
327 if (axg_card_cpu_is_playback_fe(dai_link->cpus->of_node))
328 return meson_card_set_fe_link(card, dai_link, np, true);
329 else if (axg_card_cpu_is_capture_fe(dai_link->cpus->of_node))
330 return meson_card_set_fe_link(card, dai_link, np, false);
331
332
333 ret = meson_card_set_be_link(card, dai_link, np);
334 if (ret)
335 return ret;
336
337 if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) {
338 dai_link->c2c_params = &codec_params;
339 dai_link->num_c2c_params = 1;
340 } else {
341 dai_link->no_pcm = 1;
342 snd_soc_dai_link_set_capabilities(dai_link);
343 if (axg_card_cpu_is_tdm_iface(dai_link->cpus->of_node))
344 ret = axg_card_parse_tdm(card, np, index);
345 }
346
347 return ret;
348 }
349
350 static const struct meson_card_match_data axg_card_match_data = {
351 .add_link = axg_card_add_link,
352 };
353
354 static const struct of_device_id axg_card_of_match[] = {
355 {
356 .compatible = "amlogic,axg-sound-card",
357 .data = &axg_card_match_data,
358 }, {}
359 };
360 MODULE_DEVICE_TABLE(of, axg_card_of_match);
361
362 static struct platform_driver axg_card_pdrv = {
363 .probe = meson_card_probe,
364 .remove_new = meson_card_remove,
365 .driver = {
366 .name = "axg-sound-card",
367 .of_match_table = axg_card_of_match,
368 },
369 };
370 module_platform_driver(axg_card_pdrv);
371
372 MODULE_DESCRIPTION("Amlogic AXG ALSA machine driver");
373 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
374 MODULE_LICENSE("GPL v2");
375
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