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- // SPDX-License-Identifier: (GPL-2.0 OR MIT)
- //
- // Copyright (c) 2018 BayLibre, SAS.
- // Author: Jerome Brunet <[email protected]>
- #include <linux/module.h>
- #include <linux/of_platform.h>
- #include <sound/soc.h>
- #include <sound/soc-dai.h>
- #include "axg-tdm.h"
- #include "meson-card.h"
- struct axg_dai_link_tdm_mask {
- u32 tx;
- u32 rx;
- };
- struct axg_dai_link_tdm_data {
- unsigned int mclk_fs;
- unsigned int slots;
- unsigned int slot_width;
- u32 *tx_mask;
- u32 *rx_mask;
- struct axg_dai_link_tdm_mask *codec_masks;
- };
- /*
- * Base params for the codec to codec links
- * Those will be over-written by the CPU side of the link
- */
- static const struct snd_soc_pcm_stream codec_params = {
- .formats = SNDRV_PCM_FMTBIT_S24_LE,
- .rate_min = 5525,
- .rate_max = 192000,
- .channels_min = 1,
- .channels_max = 8,
- };
- static int axg_card_tdm_be_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
- {
- struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
- struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
- struct axg_dai_link_tdm_data *be =
- (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
- return meson_card_i2s_set_sysclk(substream, params, be->mclk_fs);
- }
- static const struct snd_soc_ops axg_card_tdm_be_ops = {
- .hw_params = axg_card_tdm_be_hw_params,
- };
- static int axg_card_tdm_dai_init(struct snd_soc_pcm_runtime *rtd)
- {
- struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
- struct axg_dai_link_tdm_data *be =
- (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
- struct snd_soc_dai *codec_dai;
- int ret, i;
- for_each_rtd_codec_dais(rtd, i, codec_dai) {
- ret = snd_soc_dai_set_tdm_slot(codec_dai,
- be->codec_masks[i].tx,
- be->codec_masks[i].rx,
- be->slots, be->slot_width);
- if (ret && ret != -ENOTSUPP) {
- dev_err(codec_dai->dev,
- "setting tdm link slots failed\n");
- return ret;
- }
- }
- ret = axg_tdm_set_tdm_slots(asoc_rtd_to_cpu(rtd, 0), be->tx_mask, be->rx_mask,
- be->slots, be->slot_width);
- if (ret) {
- dev_err(asoc_rtd_to_cpu(rtd, 0)->dev, "setting tdm link slots failed\n");
- return ret;
- }
- return 0;
- }
- static int axg_card_tdm_dai_lb_init(struct snd_soc_pcm_runtime *rtd)
- {
- struct meson_card *priv = snd_soc_card_get_drvdata(rtd->card);
- struct axg_dai_link_tdm_data *be =
- (struct axg_dai_link_tdm_data *)priv->link_data[rtd->num];
- int ret;
- /* The loopback rx_mask is the pad tx_mask */
- ret = axg_tdm_set_tdm_slots(asoc_rtd_to_cpu(rtd, 0), NULL, be->tx_mask,
- be->slots, be->slot_width);
- if (ret) {
- dev_err(asoc_rtd_to_cpu(rtd, 0)->dev, "setting tdm link slots failed\n");
- return ret;
- }
- return 0;
- }
- static int axg_card_add_tdm_loopback(struct snd_soc_card *card,
- int *index)
- {
- struct meson_card *priv = snd_soc_card_get_drvdata(card);
- struct snd_soc_dai_link *pad = &card->dai_link[*index];
- struct snd_soc_dai_link *lb;
- struct snd_soc_dai_link_component *dlc;
- int ret;
- /* extend links */
- ret = meson_card_reallocate_links(card, card->num_links + 1);
- if (ret)
- return ret;
- lb = &card->dai_link[*index + 1];
- lb->name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-lb", pad->name);
- if (!lb->name)
- return -ENOMEM;
- dlc = devm_kzalloc(card->dev, 2 * sizeof(*dlc), GFP_KERNEL);
- if (!dlc)
- return -ENOMEM;
- lb->cpus = &dlc[0];
- lb->codecs = &dlc[1];
- lb->num_cpus = 1;
- lb->num_codecs = 1;
- lb->stream_name = lb->name;
- lb->cpus->of_node = pad->cpus->of_node;
- lb->cpus->dai_name = "TDM Loopback";
- lb->codecs->name = "snd-soc-dummy";
- lb->codecs->dai_name = "snd-soc-dummy-dai";
- lb->dpcm_capture = 1;
- lb->no_pcm = 1;
- lb->ops = &axg_card_tdm_be_ops;
- lb->init = axg_card_tdm_dai_lb_init;
- /* Provide the same link data to the loopback */
- priv->link_data[*index + 1] = priv->link_data[*index];
- /*
- * axg_card_clean_references() will iterate over this link,
- * make sure the node count is balanced
- */
- of_node_get(lb->cpus->of_node);
- /* Let add_links continue where it should */
- *index += 1;
- return 0;
- }
- static int 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)
- {
- char propname[32];
- u32 tx, rx;
- int i;
- be->tx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
- sizeof(*be->tx_mask), GFP_KERNEL);
- be->rx_mask = devm_kcalloc(card->dev, AXG_TDM_NUM_LANES,
- sizeof(*be->rx_mask), GFP_KERNEL);
- if (!be->tx_mask || !be->rx_mask)
- return -ENOMEM;
- for (i = 0, tx = 0; i < AXG_TDM_NUM_LANES; i++) {
- snprintf(propname, 32, "dai-tdm-slot-tx-mask-%d", i);
- snd_soc_of_get_slot_mask(node, propname, &be->tx_mask[i]);
- tx = max(tx, be->tx_mask[i]);
- }
- /* Disable playback is the interface has no tx slots */
- if (!tx)
- link->dpcm_playback = 0;
- for (i = 0, rx = 0; i < AXG_TDM_NUM_LANES; i++) {
- snprintf(propname, 32, "dai-tdm-slot-rx-mask-%d", i);
- snd_soc_of_get_slot_mask(node, propname, &be->rx_mask[i]);
- rx = max(rx, be->rx_mask[i]);
- }
- /* Disable capture is the interface has no rx slots */
- if (!rx)
- link->dpcm_capture = 0;
- /* ... but the interface should at least have one of them */
- if (!tx && !rx) {
- dev_err(card->dev, "tdm link has no cpu slots\n");
- return -EINVAL;
- }
- of_property_read_u32(node, "dai-tdm-slot-num", &be->slots);
- if (!be->slots) {
- /*
- * If the slot number is not provided, set it such as it
- * accommodates the largest mask
- */
- be->slots = fls(max(tx, rx));
- } else if (be->slots < fls(max(tx, rx)) || be->slots > 32) {
- /*
- * Error if the slots can't accommodate the largest mask or
- * if it is just too big
- */
- dev_err(card->dev, "bad slot number\n");
- return -EINVAL;
- }
- of_property_read_u32(node, "dai-tdm-slot-width", &be->slot_width);
- return 0;
- }
- static int 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)
- {
- struct axg_dai_link_tdm_mask *codec_mask;
- struct device_node *np;
- codec_mask = devm_kcalloc(card->dev, link->num_codecs,
- sizeof(*codec_mask), GFP_KERNEL);
- if (!codec_mask)
- return -ENOMEM;
- be->codec_masks = codec_mask;
- for_each_child_of_node(node, np) {
- snd_soc_of_get_slot_mask(np, "dai-tdm-slot-rx-mask",
- &codec_mask->rx);
- snd_soc_of_get_slot_mask(np, "dai-tdm-slot-tx-mask",
- &codec_mask->tx);
- codec_mask++;
- }
- return 0;
- }
- static int axg_card_parse_tdm(struct snd_soc_card *card,
- struct device_node *node,
- int *index)
- {
- struct meson_card *priv = snd_soc_card_get_drvdata(card);
- struct snd_soc_dai_link *link = &card->dai_link[*index];
- struct axg_dai_link_tdm_data *be;
- int ret;
- /* Allocate tdm link parameters */
- be = devm_kzalloc(card->dev, sizeof(*be), GFP_KERNEL);
- if (!be)
- return -ENOMEM;
- priv->link_data[*index] = be;
- /* Setup tdm link */
- link->ops = &axg_card_tdm_be_ops;
- link->init = axg_card_tdm_dai_init;
- link->dai_fmt = meson_card_parse_daifmt(node, link->cpus->of_node);
- of_property_read_u32(node, "mclk-fs", &be->mclk_fs);
- ret = axg_card_parse_cpu_tdm_slots(card, link, node, be);
- if (ret) {
- dev_err(card->dev, "error parsing tdm link slots\n");
- return ret;
- }
- ret = axg_card_parse_codecs_masks(card, link, node, be);
- if (ret)
- return ret;
- /* Add loopback if the pad dai has playback */
- if (link->dpcm_playback) {
- ret = axg_card_add_tdm_loopback(card, index);
- if (ret)
- return ret;
- }
- return 0;
- }
- static int axg_card_cpu_is_capture_fe(struct device_node *np)
- {
- return of_device_is_compatible(np, DT_PREFIX "axg-toddr");
- }
- static int axg_card_cpu_is_playback_fe(struct device_node *np)
- {
- return of_device_is_compatible(np, DT_PREFIX "axg-frddr");
- }
- static int axg_card_cpu_is_tdm_iface(struct device_node *np)
- {
- return of_device_is_compatible(np, DT_PREFIX "axg-tdm-iface");
- }
- static int axg_card_cpu_is_codec(struct device_node *np)
- {
- return of_device_is_compatible(np, DT_PREFIX "g12a-tohdmitx") ||
- of_device_is_compatible(np, DT_PREFIX "g12a-toacodec");
- }
- static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np,
- int *index)
- {
- struct snd_soc_dai_link *dai_link = &card->dai_link[*index];
- struct snd_soc_dai_link_component *cpu;
- int ret;
- cpu = devm_kzalloc(card->dev, sizeof(*cpu), GFP_KERNEL);
- if (!cpu)
- return -ENOMEM;
- dai_link->cpus = cpu;
- dai_link->num_cpus = 1;
- ret = meson_card_parse_dai(card, np, &dai_link->cpus->of_node,
- &dai_link->cpus->dai_name);
- if (ret)
- return ret;
- if (axg_card_cpu_is_playback_fe(dai_link->cpus->of_node))
- return meson_card_set_fe_link(card, dai_link, np, true);
- else if (axg_card_cpu_is_capture_fe(dai_link->cpus->of_node))
- return meson_card_set_fe_link(card, dai_link, np, false);
- ret = meson_card_set_be_link(card, dai_link, np);
- if (ret)
- return ret;
- if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) {
- dai_link->params = &codec_params;
- } else {
- dai_link->no_pcm = 1;
- snd_soc_dai_link_set_capabilities(dai_link);
- if (axg_card_cpu_is_tdm_iface(dai_link->cpus->of_node))
- ret = axg_card_parse_tdm(card, np, index);
- }
- return ret;
- }
- static const struct meson_card_match_data axg_card_match_data = {
- .add_link = axg_card_add_link,
- };
- static const struct of_device_id axg_card_of_match[] = {
- {
- .compatible = "amlogic,axg-sound-card",
- .data = &axg_card_match_data,
- }, {}
- };
- MODULE_DEVICE_TABLE(of, axg_card_of_match);
- static struct platform_driver axg_card_pdrv = {
- .probe = meson_card_probe,
- .remove = meson_card_remove,
- .driver = {
- .name = "axg-sound-card",
- .of_match_table = axg_card_of_match,
- },
- };
- module_platform_driver(axg_card_pdrv);
- MODULE_DESCRIPTION("Amlogic AXG ALSA machine driver");
- MODULE_AUTHOR("Jerome Brunet <[email protected]>");
- MODULE_LICENSE("GPL v2");
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