xref: /openbmc/linux/sound/soc/meson/axg-card.c (revision 89df62c3)
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 = asoc_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(asoc_rtd_to_cpu(rtd, 0), be->tx_mask, be->rx_mask,
76 				    be->slots, be->slot_width);
77 	if (ret) {
78 		dev_err(asoc_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(asoc_rtd_to_cpu(rtd, 0), NULL, be->tx_mask,
94 				    be->slots, be->slot_width);
95 	if (ret) {
96 		dev_err(asoc_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, 2 * sizeof(*dlc), GFP_KERNEL);
124 	if (!dlc)
125 		return -ENOMEM;
126 
127 	lb->cpus = &dlc[0];
128 	lb->codecs = &dlc[1];
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->codecs->name = "snd-soc-dummy";
136 	lb->codecs->dai_name = "snd-soc-dummy-dai";
137 	lb->dpcm_capture = 1;
138 	lb->no_pcm = 1;
139 	lb->ops = &axg_card_tdm_be_ops;
140 	lb->init = axg_card_tdm_dai_lb_init;
141 
142 	/* Provide the same link data to the loopback */
143 	priv->link_data[*index + 1] = priv->link_data[*index];
144 
145 	/*
146 	 * axg_card_clean_references() will iterate over this link,
147 	 * make sure the node count is balanced
148 	 */
149 	of_node_get(lb->cpus->of_node);
150 
151 	/* Let add_links continue where it should */
152 	*index += 1;
153 
154 	return 0;
155 }
156 
157 static int axg_card_parse_cpu_tdm_slots(struct snd_soc_card *card,
158 					struct snd_soc_dai_link *link,
159 					struct device_node *node,
160 					struct axg_dai_link_tdm_data *be)
161 {
162 	char propname[32];
163 	u32 tx, rx;
164 	int i;
165 
166 	be->tx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
167 				   sizeof(*be->tx_mask), GFP_KERNEL);
168 	be->rx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
169 				   sizeof(*be->rx_mask), GFP_KERNEL);
170 	if (!be->tx_mask || !be->rx_mask)
171 		return -ENOMEM;
172 
173 	for (i = 0, tx = 0; i < AXG_TDM_NUM_LANES; i++) {
174 		snprintf(propname, 32, "dai-tdm-slot-tx-mask-%d", i);
175 		snd_soc_of_get_slot_mask(node, propname, &be->tx_mask[i]);
176 		tx = max(tx, be->tx_mask[i]);
177 	}
178 
179 	/* Disable playback is the interface has no tx slots */
180 	if (!tx)
181 		link->dpcm_playback = 0;
182 
183 	for (i = 0, rx = 0; i < AXG_TDM_NUM_LANES; i++) {
184 		snprintf(propname, 32, "dai-tdm-slot-rx-mask-%d", i);
185 		snd_soc_of_get_slot_mask(node, propname, &be->rx_mask[i]);
186 		rx = max(rx, be->rx_mask[i]);
187 	}
188 
189 	/* Disable capture is the interface has no rx slots */
190 	if (!rx)
191 		link->dpcm_capture = 0;
192 
193 	/* ... but the interface should at least have one of them */
194 	if (!tx && !rx) {
195 		dev_err(card->dev, "tdm link has no cpu slots\n");
196 		return -EINVAL;
197 	}
198 
199 	of_property_read_u32(node, "dai-tdm-slot-num", &be->slots);
200 	if (!be->slots) {
201 		/*
202 		 * If the slot number is not provided, set it such as it
203 		 * accommodates the largest mask
204 		 */
205 		be->slots = fls(max(tx, rx));
206 	} else if (be->slots < fls(max(tx, rx)) || be->slots > 32) {
207 		/*
208 		 * Error if the slots can't accommodate the largest mask or
209 		 * if it is just too big
210 		 */
211 		dev_err(card->dev, "bad slot number\n");
212 		return -EINVAL;
213 	}
214 
215 	of_property_read_u32(node, "dai-tdm-slot-width", &be->slot_width);
216 
217 	return 0;
218 }
219 
220 static int axg_card_parse_codecs_masks(struct snd_soc_card *card,
221 				       struct snd_soc_dai_link *link,
222 				       struct device_node *node,
223 				       struct axg_dai_link_tdm_data *be)
224 {
225 	struct axg_dai_link_tdm_mask *codec_mask;
226 	struct device_node *np;
227 
228 	codec_mask = devm_kcalloc(card->dev, link->num_codecs,
229 				  sizeof(*codec_mask), GFP_KERNEL);
230 	if (!codec_mask)
231 		return -ENOMEM;
232 
233 	be->codec_masks = codec_mask;
234 
235 	for_each_child_of_node(node, np) {
236 		snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask",
237 					 &codec_mask->rx);
238 		snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask",
239 					 &codec_mask->tx);
240 
241 		codec_mask++;
242 	}
243 
244 	return 0;
245 }
246 
247 static int axg_card_parse_tdm(struct snd_soc_card *card,
248 			      struct device_node *node,
249 			      int *index)
250 {
251 	struct meson_card *priv = snd_soc_card_get_drvdata(card);
252 	struct snd_soc_dai_link *link = &card->dai_link[*index];
253 	struct axg_dai_link_tdm_data *be;
254 	int ret;
255 
256 	/* Allocate tdm link parameters */
257 	be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL);
258 	if (!be)
259 		return -ENOMEM;
260 	priv->link_data[*index] = be;
261 
262 	/* Setup tdm link */
263 	link->ops = &axg_card_tdm_be_ops;
264 	link->init = axg_card_tdm_dai_init;
265 	link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node);
266 
267 	of_property_read_u32(node, "mclk-fs", &be->mclk_fs);
268 
269 	ret = axg_card_parse_cpu_tdm_slots(card, link, node, be);
270 	if (ret) {
271 		dev_err(card->dev, "error parsing tdm link slots\n");
272 		return ret;
273 	}
274 
275 	ret = axg_card_parse_codecs_masks(card, link, node, be);
276 	if (ret)
277 		return ret;
278 
279 	/* Add loopback if the pad dai has playback */
280 	if (link->dpcm_playback) {
281 		ret = axg_card_add_tdm_loopback(card, index);
282 		if (ret)
283 			return ret;
284 	}
285 
286 	return 0;
287 }
288 
289 static int axg_card_cpu_is_capture_fe(struct device_node *np)
290 {
291 	return of_device_is_compatible(np, DT_PREFIX "axg-toddr");
292 }
293 
294 static int axg_card_cpu_is_playback_fe(struct device_node *np)
295 {
296 	return of_device_is_compatible(np, DT_PREFIX "axg-frddr");
297 }
298 
299 static int axg_card_cpu_is_tdm_iface(struct device_node *np)
300 {
301 	return of_device_is_compatible(np, DT_PREFIX "axg-tdm-iface");
302 }
303 
304 static int axg_card_cpu_is_codec(struct device_node *np)
305 {
306 	return of_device_is_compatible(np, DT_PREFIX "g12a-tohdmitx") ||
307 		of_device_is_compatible(np, DT_PREFIX "g12a-toacodec");
308 }
309 
310 static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np,
311 			     int *index)
312 {
313 	struct snd_soc_dai_link *dai_link = &card->dai_link[*index];
314 	struct snd_soc_dai_link_component *cpu;
315 	int ret;
316 
317 	cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL);
318 	if (!cpu)
319 		return -ENOMEM;
320 
321 	dai_link->cpus = cpu;
322 	dai_link->num_cpus = 1;
323 
324 	ret = meson_card_parse_dai(card, np, &dai_link->cpus->of_node,
325 				   &dai_link->cpus->dai_name);
326 	if (ret)
327 		return ret;
328 
329 	if (axg_card_cpu_is_playback_fe(dai_link->cpus->of_node))
330 		return meson_card_set_fe_link(card, dai_link, np, true);
331 	else if (axg_card_cpu_is_capture_fe(dai_link->cpus->of_node))
332 		return meson_card_set_fe_link(card, dai_link, np, false);
333 
334 
335 	ret = meson_card_set_be_link(card, dai_link, np);
336 	if (ret)
337 		return ret;
338 
339 	if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) {
340 		dai_link->c2c_params = &codec_params;
341 		dai_link->num_c2c_params = 1;
342 	} else {
343 		dai_link->no_pcm = 1;
344 		snd_soc_dai_link_set_capabilities(dai_link);
345 		if (axg_card_cpu_is_tdm_iface(dai_link->cpus->of_node))
346 			ret = axg_card_parse_tdm(card, np, index);
347 	}
348 
349 	return ret;
350 }
351 
352 static const struct meson_card_match_data axg_card_match_data = {
353 	.add_link = axg_card_add_link,
354 };
355 
356 static const struct of_device_id axg_card_of_match[] = {
357 	{
358 		.compatible = "amlogic,axg-sound-card",
359 		.data = &axg_card_match_data,
360 	}, {}
361 };
362 MODULE_DEVICE_TABLE(of, axg_card_of_match);
363 
364 static struct platform_driver axg_card_pdrv = {
365 	.probe = meson_card_probe,
366 	.remove = meson_card_remove,
367 	.driver = {
368 		.name = "axg-sound-card",
369 		.of_match_table = axg_card_of_match,
370 	},
371 };
372 module_platform_driver(axg_card_pdrv);
373 
374 MODULE_DESCRIPTION("Amlogic AXG ALSA machine driver");
375 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
376 MODULE_LICENSE("GPL v2");
377