xref: /openbmc/linux/sound/soc/meson/axg-card.c (revision 52a31a05) 
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, sizeof(*dlc), GFP_KERNEL);
124 	if (!dlc)
125 		return -ENOMEM;
126 
127 	lb->cpus = dlc;
128 	lb->codecs = &asoc_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 = 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