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
axg_card_tdm_be_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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
axg_card_tdm_dai_init(struct snd_soc_pcm_runtime * rtd)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
axg_card_tdm_dai_lb_init(struct snd_soc_pcm_runtime * rtd)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
axg_card_add_tdm_loopback(struct snd_soc_card * card,int * index)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;
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 pad = &card->dai_link[*index];
118 lb = &card->dai_link[*index + 1];
119
120 lb->name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-lb", pad->name);
121 if (!lb->name)
122 return -ENOMEM;
123
124 dlc = devm_kzalloc(card->dev, sizeof(*dlc), GFP_KERNEL);
125 if (!dlc)
126 return -ENOMEM;
127
128 lb->cpus = dlc;
129 lb->codecs = &snd_soc_dummy_dlc;
130 lb->num_cpus = 1;
131 lb->num_codecs = 1;
132
133 lb->stream_name = lb->name;
134 lb->cpus->of_node = pad->cpus->of_node;
135 lb->cpus->dai_name = "TDM Loopback";
136 lb->capture_only = 1;
137 lb->no_pcm = 1;
138 lb->ops = &axg_card_tdm_be_ops;
139 lb->init = axg_card_tdm_dai_lb_init;
140
141 /* Provide the same link data to the loopback */
142 priv->link_data[*index + 1] = priv->link_data[*index];
143
144 /*
145 * axg_card_clean_references() will iterate over this link,
146 * make sure the node count is balanced
147 */
148 of_node_get(lb->cpus->of_node);
149
150 /* Let add_links continue where it should */
151 *index += 1;
152
153 return 0;
154 }
155
axg_card_parse_cpu_tdm_slots(struct snd_soc_card * card,struct snd_soc_dai_link * link,struct device_node * node,struct axg_dai_link_tdm_data * be)156 static int axg_card_parse_cpu_tdm_slots(struct snd_soc_card *card,
157 struct snd_soc_dai_link *link,
158 struct device_node *node,
159 struct axg_dai_link_tdm_data *be)
160 {
161 char propname[32];
162 u32 tx, rx;
163 int i;
164
165 be->tx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
166 sizeof(*be->tx_mask), GFP_KERNEL);
167 be->rx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
168 sizeof(*be->rx_mask), GFP_KERNEL);
169 if (!be->tx_mask || !be->rx_mask)
170 return -ENOMEM;
171
172 for (i = 0, tx = 0; i < AXG_TDM_NUM_LANES; i++) {
173 snprintf(propname, 32, "dai-tdm-slot-tx-mask-%d", i);
174 snd_soc_of_get_slot_mask(node, propname, &be->tx_mask[i]);
175 tx = max(tx, be->tx_mask[i]);
176 }
177
178 /* Disable playback is the interface has no tx slots */
179 if (!tx)
180 link->capture_only = 1;
181
182 for (i = 0, rx = 0; i < AXG_TDM_NUM_LANES; i++) {
183 snprintf(propname, 32, "dai-tdm-slot-rx-mask-%d", i);
184 snd_soc_of_get_slot_mask(node, propname, &be->rx_mask[i]);
185 rx = max(rx, be->rx_mask[i]);
186 }
187
188 /* Disable capture is the interface has no rx slots */
189 if (!rx)
190 link->playback_only = 1;
191
192 /* ... but the interface should at least have one direction */
193 if (!tx && !rx) {
194 dev_err(card->dev, "tdm link has no cpu slots\n");
195 return -EINVAL;
196 }
197
198 of_property_read_u32(node, "dai-tdm-slot-num", &be->slots);
199 if (!be->slots) {
200 /*
201 * If the slot number is not provided, set it such as it
202 * accommodates the largest mask
203 */
204 be->slots = fls(max(tx, rx));
205 } else if (be->slots < fls(max(tx, rx)) || be->slots > 32) {
206 /*
207 * Error if the slots can't accommodate the largest mask or
208 * if it is just too big
209 */
210 dev_err(card->dev, "bad slot number\n");
211 return -EINVAL;
212 }
213
214 of_property_read_u32(node, "dai-tdm-slot-width", &be->slot_width);
215
216 return 0;
217 }
218
axg_card_parse_codecs_masks(struct snd_soc_card * card,struct snd_soc_dai_link * link,struct device_node * node,struct axg_dai_link_tdm_data * be)219 static int axg_card_parse_codecs_masks(struct snd_soc_card *card,
220 struct snd_soc_dai_link *link,
221 struct device_node *node,
222 struct axg_dai_link_tdm_data *be)
223 {
224 struct axg_dai_link_tdm_mask *codec_mask;
225 struct device_node *np;
226
227 codec_mask = devm_kcalloc(card->dev, link->num_codecs,
228 sizeof(*codec_mask), GFP_KERNEL);
229 if (!codec_mask)
230 return -ENOMEM;
231
232 be->codec_masks = codec_mask;
233
234 for_each_child_of_node(node, np) {
235 snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask",
236 &codec_mask->rx);
237 snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask",
238 &codec_mask->tx);
239
240 codec_mask++;
241 }
242
243 return 0;
244 }
245
axg_card_parse_tdm(struct snd_soc_card * card,struct device_node * node,int * index)246 static int axg_card_parse_tdm(struct snd_soc_card *card,
247 struct device_node *node,
248 int *index)
249 {
250 struct meson_card *priv = snd_soc_card_get_drvdata(card);
251 struct snd_soc_dai_link *link = &card->dai_link[*index];
252 struct axg_dai_link_tdm_data *be;
253 int ret;
254
255 /* Allocate tdm link parameters */
256 be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL);
257 if (!be)
258 return -ENOMEM;
259 priv->link_data[*index] = be;
260
261 /* Setup tdm link */
262 link->ops = &axg_card_tdm_be_ops;
263 link->init = axg_card_tdm_dai_init;
264 link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node);
265
266 of_property_read_u32(node, "mclk-fs", &be->mclk_fs);
267
268 ret = axg_card_parse_cpu_tdm_slots(card, link, node, be);
269 if (ret) {
270 dev_err(card->dev, "error parsing tdm link slots\n");
271 return ret;
272 }
273
274 ret = axg_card_parse_codecs_masks(card, link, node, be);
275 if (ret)
276 return ret;
277
278 /* Add loopback if the pad dai has playback */
279 if (!link->capture_only) {
280 ret = axg_card_add_tdm_loopback(card, index);
281 if (ret)
282 return ret;
283 }
284
285 return 0;
286 }
287
axg_card_cpu_is_capture_fe(struct device_node * np)288 static int axg_card_cpu_is_capture_fe(struct device_node *np)
289 {
290 return of_device_is_compatible(np, DT_PREFIX "axg-toddr");
291 }
292
axg_card_cpu_is_playback_fe(struct device_node * np)293 static int axg_card_cpu_is_playback_fe(struct device_node *np)
294 {
295 return of_device_is_compatible(np, DT_PREFIX "axg-frddr");
296 }
297
axg_card_cpu_is_tdm_iface(struct device_node * np)298 static int axg_card_cpu_is_tdm_iface(struct device_node *np)
299 {
300 return of_device_is_compatible(np, DT_PREFIX "axg-tdm-iface");
301 }
302
axg_card_cpu_is_codec(struct device_node * np)303 static int axg_card_cpu_is_codec(struct device_node *np)
304 {
305 return of_device_is_compatible(np, DT_PREFIX "g12a-tohdmitx") ||
306 of_device_is_compatible(np, DT_PREFIX "g12a-toacodec");
307 }
308
axg_card_add_link(struct snd_soc_card * card,struct device_node * np,int * index)309 static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np,
310 int *index)
311 {
312 struct snd_soc_dai_link *dai_link = &card->dai_link[*index];
313 struct snd_soc_dai_link_component *cpu;
314 int ret;
315
316 cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL);
317 if (!cpu)
318 return -ENOMEM;
319
320 dai_link->cpus = cpu;
321 dai_link->num_cpus = 1;
322 dai_link->nonatomic = true;
323
324 ret = meson_card_parse_dai(card, np, dai_link->cpus);
325 if (ret)
326 return ret;
327
328 if (axg_card_cpu_is_playback_fe(dai_link->cpus->of_node))
329 return meson_card_set_fe_link(card, dai_link, np, true);
330 else if (axg_card_cpu_is_capture_fe(dai_link->cpus->of_node))
331 return meson_card_set_fe_link(card, dai_link, np, false);
332
333
334 ret = meson_card_set_be_link(card, dai_link, np);
335 if (ret)
336 return ret;
337
338 if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) {
339 dai_link->c2c_params = &codec_params;
340 dai_link->num_c2c_params = 1;
341 } else {
342 dai_link->no_pcm = 1;
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 = 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