soc/meson/axg-card.c

0001 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
0002 //
0003 // Copyright (c) 2018 BayLibre, SAS.
0004 // Author: Jerome Brunet <jbrunet@baylibre.com>
0005
0006 #include <linux/module.h>
0007 #include <linux/of_platform.h>
0008 #include <sound/soc.h>
0009 #include <sound/soc-dai.h>
0010
0011 #include "axg-tdm.h"
0012 #include "meson-card.h"
0013
0014 struct axg_dai_link_tdm_mask {
0015     u32 tx;
0016     u32 rx;
0017 };
0018
0019 struct axg_dai_link_tdm_data {
0020     unsigned int mclk_fs;
0021     unsigned int slots;
0022     unsigned int slot_width;
0023     u32 *tx_mask;
0024     u32 *rx_mask;
0025     struct axg_dai_link_tdm_mask *codec_masks;
0026 };
0027
0028 /*
0029  * Base params for the codec to codec links
0030  * Those will be over-written by the CPU side of the link
0031  */
0032 static const struct snd_soc_pcm_stream codec_params = {
0033     .formats = SNDRV_PCM_FMTBIT_S24_LE,
0034     .rate_min = 5525,
0035     .rate_max = 192000,
0036     .channels_min = 1,
0037     .channels_max = 8,
0038 };
0039
0040 static int axg_card_tdm_be_hw_params(struct snd_pcm_substream *substream,
0041                      struct snd_pcm_hw_params *params)
0042 {
0043     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
0044     struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
0045     struct axg_dai_link_tdm_data *be =
0046         (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
0047
0048     return meson_card_i2s_set_sysclk(substream, params, be->mclk_fs);
0049 }
0050
0051 static const struct snd_soc_ops axg_card_tdm_be_ops = {
0052     .hw_params = axg_card_tdm_be_hw_params,
0053 };
0054
0055 static int axg_card_tdm_dai_init(struct snd_soc_pcm_runtime *rtd)
0056 {
0057     struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
0058     struct axg_dai_link_tdm_data *be =
0059         (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
0060     struct snd_soc_dai *codec_dai;
0061     int ret, i;
0062
0063     for_each_rtd_codec_dais(rtd, i, codec_dai) {
0064         ret = snd_soc_dai_set_tdm_slot(codec_dai,
0065                            be->codec_masks[i].tx,
0066                            be->codec_masks[i].rx,
0067                            be->slots, be->slot_width);
0068         if (ret && ret != -ENOTSUPP) {
0069             dev_err(codec_dai->dev,
0070                 "setting tdm link slots failed\n");
0071             return ret;
0072         }
0073     }
0074
0075     ret = axg_tdm_set_tdm_slots(asoc_rtd_to_cpu(rtd, 0), be->tx_mask, be->rx_mask,
0076                     be->slots, be->slot_width);
0077     if (ret) {
0078         dev_err(asoc_rtd_to_cpu(rtd, 0)->dev, "setting tdm link slots failed\n");
0079         return ret;
0080     }
0081
0082     return 0;
0083 }
0084
0085 static int axg_card_tdm_dai_lb_init(struct snd_soc_pcm_runtime *rtd)
0086 {
0087     struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
0088     struct axg_dai_link_tdm_data *be =
0089         (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
0090     int ret;
0091
0092     /* The loopback rx_mask is the pad tx_mask */
0093     ret = axg_tdm_set_tdm_slots(asoc_rtd_to_cpu(rtd, 0), NULL, be->tx_mask,
0094                     be->slots, be->slot_width);
0095     if (ret) {
0096         dev_err(asoc_rtd_to_cpu(rtd, 0)->dev, "setting tdm link slots failed\n");
0097         return ret;
0098     }
0099
0100     return 0;
0101 }
0102
0103 static int axg_card_add_tdm_loopback(struct snd_soc_card *card,
0104                      int *index)
0105 {
0106     struct meson_card *priv = snd_soc_card_get_drvdata(card);
0107     struct snd_soc_dai_link *pad = &card->dai_link[*index];
0108     struct snd_soc_dai_link *lb;
0109     struct snd_soc_dai_link_component *dlc;
0110     int ret;
0111
0112     /* extend links */
0113     ret = meson_card_reallocate_links(card, card->num_links + 1);
0114     if (ret)
0115         return ret;
0116
0117     lb = &card->dai_link[*index + 1];
0118
0119     lb->name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-lb", pad->name);
0120     if (!lb->name)
0121         return -ENOMEM;
0122
0123     dlc = devm_kzalloc(card->dev, 2 * sizeof(*dlc), GFP_KERNEL);
0124     if (!dlc)
0125         return -ENOMEM;
0126
0127     lb->cpus = &dlc[0];
0128     lb->codecs = &dlc[1];
0129     lb->num_cpus = 1;
0130     lb->num_codecs = 1;
0131
0132     lb->stream_name = lb->name;
0133     lb->cpus->of_node = pad->cpus->of_node;
0134     lb->cpus->dai_name = "TDM Loopback";
0135     lb->codecs->name = "snd-soc-dummy";
0136     lb->codecs->dai_name = "snd-soc-dummy-dai";
0137     lb->dpcm_capture = 1;
0138     lb->no_pcm = 1;
0139     lb->ops = &axg_card_tdm_be_ops;
0140     lb->init = axg_card_tdm_dai_lb_init;
0141
0142     /* Provide the same link data to the loopback */
0143     priv->link_data[*index + 1] = priv->link_data[*index];
0144
0145     /*
0146      * axg_card_clean_references() will iterate over this link,
0147      * make sure the node count is balanced
0148      */
0149     of_node_get(lb->cpus->of_node);
0150
0151     /* Let add_links continue where it should */
0152     *index += 1;
0153
0154     return 0;
0155 }
0156
0157 static int axg_card_parse_cpu_tdm_slots(struct snd_soc_card *card,
0158                     struct snd_soc_dai_link *link,
0159                     struct device_node *node,
0160                     struct axg_dai_link_tdm_data *be)
0161 {
0162     char propname[32];
0163     u32 tx, rx;
0164     int i;
0165
0166     be->tx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
0167                    sizeof(*be->tx_mask), GFP_KERNEL);
0168     be->rx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
0169                    sizeof(*be->rx_mask), GFP_KERNEL);
0170     if (!be->tx_mask || !be->rx_mask)
0171         return -ENOMEM;
0172
0173     for (i = 0, tx = 0; i < AXG_TDM_NUM_LANES; i++) {
0174         snprintf(propname, 32, "dai-tdm-slot-tx-mask-%d", i);
0175         snd_soc_of_get_slot_mask(node, propname, &be->tx_mask[i]);
0176         tx = max(tx, be->tx_mask[i]);
0177     }
0178
0179     /* Disable playback is the interface has no tx slots */
0180     if (!tx)
0181         link->dpcm_playback = 0;
0182
0183     for (i = 0, rx = 0; i < AXG_TDM_NUM_LANES; i++) {
0184         snprintf(propname, 32, "dai-tdm-slot-rx-mask-%d", i);
0185         snd_soc_of_get_slot_mask(node, propname, &be->rx_mask[i]);
0186         rx = max(rx, be->rx_mask[i]);
0187     }
0188
0189     /* Disable capture is the interface has no rx slots */
0190     if (!rx)
0191         link->dpcm_capture = 0;
0192
0193     /* ... but the interface should at least have one of them */
0194     if (!tx && !rx) {
0195         dev_err(card->dev, "tdm link has no cpu slots\n");
0196         return -EINVAL;
0197     }
0198
0199     of_property_read_u32(node, "dai-tdm-slot-num", &be->slots);
0200     if (!be->slots) {
0201         /*
0202          * If the slot number is not provided, set it such as it
0203          * accommodates the largest mask
0204          */
0205         be->slots = fls(max(tx, rx));
0206     } else if (be->slots < fls(max(tx, rx)) || be->slots > 32) {
0207         /*
0208          * Error if the slots can't accommodate the largest mask or
0209          * if it is just too big
0210          */
0211         dev_err(card->dev, "bad slot number\n");
0212         return -EINVAL;
0213     }
0214
0215     of_property_read_u32(node, "dai-tdm-slot-width", &be->slot_width);
0216
0217     return 0;
0218 }
0219
0220 static int axg_card_parse_codecs_masks(struct snd_soc_card *card,
0221                        struct snd_soc_dai_link *link,
0222                        struct device_node *node,
0223                        struct axg_dai_link_tdm_data *be)
0224 {
0225     struct axg_dai_link_tdm_mask *codec_mask;
0226     struct device_node *np;
0227
0228     codec_mask = devm_kcalloc(card->dev, link->num_codecs,
0229                   sizeof(*codec_mask), GFP_KERNEL);
0230     if (!codec_mask)
0231         return -ENOMEM;
0232
0233     be->codec_masks = codec_mask;
0234
0235     for_each_child_of_node(node, np) {
0236         snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask",
0237                      &codec_mask->rx);
0238         snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask",
0239                      &codec_mask->tx);
0240
0241         codec_mask++;
0242     }
0243
0244     return 0;
0245 }
0246
0247 static int axg_card_parse_tdm(struct snd_soc_card *card,
0248                   struct device_node *node,
0249                   int *index)
0250 {
0251     struct meson_card *priv = snd_soc_card_get_drvdata(card);
0252     struct snd_soc_dai_link *link = &card->dai_link[*index];
0253     struct axg_dai_link_tdm_data *be;
0254     int ret;
0255
0256     /* Allocate tdm link parameters */
0257     be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL);
0258     if (!be)
0259         return -ENOMEM;
0260     priv->link_data[*index] = be;
0261
0262     /* Setup tdm link */
0263     link->ops = &axg_card_tdm_be_ops;
0264     link->init = axg_card_tdm_dai_init;
0265     link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node);
0266
0267     of_property_read_u32(node, "mclk-fs", &be->mclk_fs);
0268
0269     ret = axg_card_parse_cpu_tdm_slots(card, link, node, be);
0270     if (ret) {
0271         dev_err(card->dev, "error parsing tdm link slots\n");
0272         return ret;
0273     }
0274
0275     ret = axg_card_parse_codecs_masks(card, link, node, be);
0276     if (ret)
0277         return ret;
0278
0279     /* Add loopback if the pad dai has playback */
0280     if (link->dpcm_playback) {
0281         ret = axg_card_add_tdm_loopback(card, index);
0282         if (ret)
0283             return ret;
0284     }
0285
0286     return 0;
0287 }
0288
0289 static int axg_card_cpu_is_capture_fe(struct device_node *np)
0290 {
0291     return of_device_is_compatible(np, DT_PREFIX "axg-toddr");
0292 }
0293
0294 static int axg_card_cpu_is_playback_fe(struct device_node *np)
0295 {
0296     return of_device_is_compatible(np, DT_PREFIX "axg-frddr");
0297 }
0298
0299 static int axg_card_cpu_is_tdm_iface(struct device_node *np)
0300 {
0301     return of_device_is_compatible(np, DT_PREFIX "axg-tdm-iface");
0302 }
0303
0304 static int axg_card_cpu_is_codec(struct device_node *np)
0305 {
0306     return of_device_is_compatible(np, DT_PREFIX "g12a-tohdmitx") ||
0307         of_device_is_compatible(np, DT_PREFIX "g12a-toacodec");
0308 }
0309
0310 static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np,
0311                  int *index)
0312 {
0313     struct snd_soc_dai_link *dai_link = &card->dai_link[*index];
0314     struct snd_soc_dai_link_component *cpu;
0315     int ret;
0316
0317     cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL);
0318     if (!cpu)
0319         return -ENOMEM;
0320
0321     dai_link->cpus = cpu;
0322     dai_link->num_cpus = 1;
0323
0324     ret = meson_card_parse_dai(card, np, &dai_link->cpus->of_node,
0325                    &dai_link->cpus->dai_name);
0326     if (ret)
0327         return ret;
0328
0329     if (axg_card_cpu_is_playback_fe(dai_link->cpus->of_node))
0330         return meson_card_set_fe_link(card, dai_link, np, true);
0331     else if (axg_card_cpu_is_capture_fe(dai_link->cpus->of_node))
0332         return meson_card_set_fe_link(card, dai_link, np, false);
0333
0334
0335     ret = meson_card_set_be_link(card, dai_link, np);
0336     if (ret)
0337         return ret;
0338
0339     if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) {
0340         dai_link->params = &codec_params;
0341     } else {
0342         dai_link->no_pcm = 1;
0343         snd_soc_dai_link_set_capabilities(dai_link);
0344         if (axg_card_cpu_is_tdm_iface(dai_link->cpus->of_node))
0345             ret = axg_card_parse_tdm(card, np, index);
0346     }
0347
0348     return ret;
0349 }
0350
0351 static const struct meson_card_match_data axg_card_match_data = {
0352     .add_link = axg_card_add_link,
0353 };
0354
0355 static const struct of_device_id axg_card_of_match[] = {
0356     {
0357         .compatible = "amlogic,axg-sound-card",
0358         .data = &axg_card_match_data,
0359     }, {}
0360 };
0361 MODULE_DEVICE_TABLE(of, axg_card_of_match);
0362
0363 static struct platform_driver axg_card_pdrv = {
0364     .probe = meson_card_probe,
0365     .remove = meson_card_remove,
0366     .driver = {
0367         .name = "axg-sound-card",
0368         .of_match_table = axg_card_of_match,
0369     },
0370 };
0371 module_platform_driver(axg_card_pdrv);
0372
0373 MODULE_DESCRIPTION("Amlogic AXG ALSA machine driver");
0374 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
0375 MODULE_LICENSE("GPL v2");