--- /dev/null
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+//
+// Copyright (c) 2018 BayLibre, SAS.
+// Author: Jerome Brunet <jbrunet@baylibre.com>
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "axg-tdm.h"
+
+struct axg_card {
+ struct snd_soc_card card;
+ void **link_data;
+};
+
+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;
+};
+
+#define PREFIX "amlogic,"
+
+static int axg_card_reallocate_links(struct axg_card *priv,
+ unsigned int num_links)
+{
+ struct snd_soc_dai_link *links;
+ void **ldata;
+
+ links = krealloc(priv->card.dai_link,
+ num_links * sizeof(*priv->card.dai_link),
+ GFP_KERNEL | __GFP_ZERO);
+ ldata = krealloc(priv->link_data,
+ num_links * sizeof(*priv->link_data),
+ GFP_KERNEL | __GFP_ZERO);
+
+ if (!links || !ldata) {
+ dev_err(priv->card.dev, "failed to allocate links\n");
+ return -ENOMEM;
+ }
+
+ priv->card.dai_link = links;
+ priv->link_data = ldata;
+ priv->card.num_links = num_links;
+ return 0;
+}
+
+static int axg_card_parse_dai(struct snd_soc_card *card,
+ struct device_node *node,
+ struct device_node **dai_of_node,
+ const char **dai_name)
+{
+ struct of_phandle_args args;
+ int ret;
+
+ if (!dai_name || !dai_of_node || !node)
+ return -EINVAL;
+
+ ret = of_parse_phandle_with_args(node, "sound-dai",
+ "#sound-dai-cells", 0, &args);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(card->dev, "can't parse dai %d\n", ret);
+ return ret;
+ }
+ *dai_of_node = args.np;
+
+ return snd_soc_get_dai_name(&args, dai_name);
+}
+
+static int axg_card_set_link_name(struct snd_soc_card *card,
+ struct snd_soc_dai_link *link,
+ const char *prefix)
+{
+ char *name = devm_kasprintf(card->dev, GFP_KERNEL, "%s.%s",
+ prefix, link->cpu_of_node->full_name);
+ if (!name)
+ return -ENOMEM;
+
+ link->name = name;
+ link->stream_name = name;
+
+ return 0;
+}
+
+static void axg_card_clean_references(struct axg_card *priv)
+{
+ struct snd_soc_card *card = &priv->card;
+ struct snd_soc_dai_link *link;
+ int i, j;
+
+ if (card->dai_link) {
+ for (i = 0; i < card->num_links; i++) {
+ link = &card->dai_link[i];
+ of_node_put(link->cpu_of_node);
+ for (j = 0; j < link->num_codecs; j++)
+ of_node_put(link->codecs[j].of_node);
+ }
+ }
+
+ if (card->aux_dev) {
+ for (i = 0; i < card->num_aux_devs; i++)
+ of_node_put(card->aux_dev[i].codec_of_node);
+ }
+
+ kfree(card->dai_link);
+ kfree(priv->link_data);
+}
+
+static int axg_card_add_aux_devices(struct snd_soc_card *card)
+{
+ struct device_node *node = card->dev->of_node;
+ struct snd_soc_aux_dev *aux;
+ int num, i;
+
+ num = of_count_phandle_with_args(node, PREFIX "aux-devs", NULL);
+ if (num == -ENOENT) {
+ /*
+ * It is ok to have no auxiliary devices but for this card it
+ * is a strange situtation. Let's warn the about it.
+ */
+ dev_warn(card->dev, "card has no auxiliary devices\n");
+ return 0;
+ } else if (num < 0) {
+ dev_err(card->dev, "error getting auxiliary devices: %d\n",
+ num);
+ return num;
+ }
+
+ aux = devm_kcalloc(card->dev, num, sizeof(*aux), GFP_KERNEL);
+ if (!aux)
+ return -ENOMEM;
+ card->aux_dev = aux;
+ card->num_aux_devs = num;
+
+ for (i = 0; i < card->num_aux_devs; i++, aux++) {
+ aux->codec_of_node = of_parse_phandle(node,
+ PREFIX "aux-devs", i);
+ if (!aux->codec_of_node)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+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 = substream->private_data;
+ struct axg_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;
+ unsigned int mclk;
+ int ret, i;
+
+ if (be->mclk_fs) {
+ mclk = params_rate(params) * be->mclk_fs;
+
+ for (i = 0; i < rtd->num_codecs; i++) {
+ codec_dai = rtd->codec_dais[i];
+ ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
+ SND_SOC_CLOCK_IN);
+ if (ret && ret != -ENOTSUPP)
+ return ret;
+ }
+
+ ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, 0, mclk,
+ SND_SOC_CLOCK_OUT);
+ if (ret && ret != -ENOTSUPP)
+ return ret;
+ }
+
+ return 0;
+}
+
+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 axg_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 (i = 0; i < rtd->num_codecs; i++) {
+ codec_dai = rtd->codec_dais[i];
+ 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(rtd->cpu_dai, be->tx_mask, be->rx_mask,
+ be->slots, be->slot_width);
+ if (ret) {
+ dev_err(rtd->cpu_dai->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 axg_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(rtd->cpu_dai, NULL, be->tx_mask,
+ be->slots, be->slot_width);
+ if (ret) {
+ dev_err(rtd->cpu_dai->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 axg_card *priv = snd_soc_card_get_drvdata(card);
+ struct snd_soc_dai_link *pad = &card->dai_link[*index];
+ struct snd_soc_dai_link *lb;
+ int ret;
+
+ /* extend links */
+ ret = axg_card_reallocate_links(priv, card->num_links + 1);
+ if (ret)
+ return ret;
+
+ lb = &card->dai_link[*index + 1];
+
+ lb->name = kasprintf(GFP_KERNEL, "%s-lb", pad->name);
+ if (!lb->name)
+ return -ENOMEM;
+
+ lb->stream_name = lb->name;
+ lb->cpu_of_node = pad->cpu_of_node;
+ lb->cpu_dai_name = "TDM Loopback";
+ lb->codec_name = "snd-soc-dummy";
+ lb->codec_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->cpu_of_node);
+
+ /* Let add_links continue where it should */
+ *index += 1;
+
+ return 0;
+}
+
+static unsigned int axg_card_parse_daifmt(struct device_node *node,
+ struct device_node *cpu_node)
+{
+ struct device_node *bitclkmaster = NULL;
+ struct device_node *framemaster = NULL;
+ unsigned int daifmt;
+
+ daifmt = snd_soc_of_parse_daifmt(node, PREFIX,
+ &bitclkmaster, &framemaster);
+ daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
+
+ /* If no master is provided, default to cpu master */
+ if (!bitclkmaster || bitclkmaster == cpu_node) {
+ daifmt |= (!framemaster || framemaster == cpu_node) ?
+ SND_SOC_DAIFMT_CBS_CFS : SND_SOC_DAIFMT_CBS_CFM;
+ } else {
+ daifmt |= (!framemaster || framemaster == cpu_node) ?
+ SND_SOC_DAIFMT_CBM_CFS : SND_SOC_DAIFMT_CBM_CFM;
+ }
+
+ of_node_put(bitclkmaster);
+ of_node_put(framemaster);
+
+ return daifmt;
+}
+
+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 axg_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 = axg_card_parse_daifmt(node, link->cpu_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_set_be_link(struct snd_soc_card *card,
+ struct snd_soc_dai_link *link,
+ struct device_node *node)
+{
+ struct snd_soc_dai_link_component *codec;
+ struct device_node *np;
+ int ret, num_codecs;
+
+ link->no_pcm = 1;
+ link->dpcm_playback = 1;
+ link->dpcm_capture = 1;
+
+ num_codecs = of_get_child_count(node);
+ if (!num_codecs) {
+ dev_err(card->dev, "be link %s has no codec\n",
+ node->full_name);
+ return -EINVAL;
+ }
+
+ codec = devm_kcalloc(card->dev, num_codecs, sizeof(*codec), GFP_KERNEL);
+ if (!codec)
+ return -ENOMEM;
+
+ link->codecs = codec;
+ link->num_codecs = num_codecs;
+
+ for_each_child_of_node(node, np) {
+ ret = axg_card_parse_dai(card, np, &codec->of_node,
+ &codec->dai_name);
+ if (ret) {
+ of_node_put(np);
+ return ret;
+ }
+
+ codec++;
+ }
+
+ ret = axg_card_set_link_name(card, link, "be");
+ if (ret)
+ dev_err(card->dev, "error setting %s link name\n", np->name);
+
+ return ret;
+}
+
+static int axg_card_set_fe_link(struct snd_soc_card *card,
+ struct snd_soc_dai_link *link,
+ bool is_playback)
+{
+ link->dynamic = 1;
+ link->dpcm_merged_format = 1;
+ link->dpcm_merged_chan = 1;
+ link->dpcm_merged_rate = 1;
+ link->codec_dai_name = "snd-soc-dummy-dai";
+ link->codec_name = "snd-soc-dummy";
+
+ if (is_playback)
+ link->dpcm_playback = 1;
+ else
+ link->dpcm_capture = 1;
+
+ return axg_card_set_link_name(card, link, "fe");
+}
+
+static int axg_card_cpu_is_capture_fe(struct device_node *np)
+{
+ return of_device_is_compatible(np, PREFIX "axg-toddr");
+}
+
+static int axg_card_cpu_is_playback_fe(struct device_node *np)
+{
+ return of_device_is_compatible(np, PREFIX "axg-frddr");
+}
+
+static int axg_card_cpu_is_tdm_iface(struct device_node *np)
+{
+ return of_device_is_compatible(np, PREFIX "axg-tdm-iface");
+}
+
+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];
+ int ret;
+
+ ret = axg_card_parse_dai(card, np, &dai_link->cpu_of_node,
+ &dai_link->cpu_dai_name);
+ if (ret)
+ return ret;
+
+ if (axg_card_cpu_is_playback_fe(dai_link->cpu_of_node))
+ ret = axg_card_set_fe_link(card, dai_link, true);
+ else if (axg_card_cpu_is_capture_fe(dai_link->cpu_of_node))
+ ret = axg_card_set_fe_link(card, dai_link, false);
+ else
+ ret = axg_card_set_be_link(card, dai_link, np);
+
+ if (ret)
+ return ret;
+
+ if (axg_card_cpu_is_tdm_iface(dai_link->cpu_of_node))
+ ret = axg_card_parse_tdm(card, np, index);
+
+ return ret;
+}
+
+static int axg_card_add_links(struct snd_soc_card *card)
+{
+ struct axg_card *priv = snd_soc_card_get_drvdata(card);
+ struct device_node *node = card->dev->of_node;
+ struct device_node *np;
+ int num, i, ret;
+
+ num = of_get_child_count(node);
+ if (!num) {
+ dev_err(card->dev, "card has no links\n");
+ return -EINVAL;
+ }
+
+ ret = axg_card_reallocate_links(priv, num);
+ if (ret)
+ return ret;
+
+ i = 0;
+ for_each_child_of_node(node, np) {
+ ret = axg_card_add_link(card, np, &i);
+ if (ret) {
+ of_node_put(np);
+ return ret;
+ }
+
+ i++;
+ }
+
+ return 0;
+}
+
+static int axg_card_parse_of_optional(struct snd_soc_card *card,
+ const char *propname,
+ int (*func)(struct snd_soc_card *c,
+ const char *p))
+{
+ /* If property is not provided, don't fail ... */
+ if (!of_property_read_bool(card->dev->of_node, propname))
+ return 0;
+
+ /* ... but do fail if it is provided and the parsing fails */
+ return func(card, propname);
+}
+
+static const struct of_device_id axg_card_of_match[] = {
+ { .compatible = "amlogic,axg-sound-card", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, axg_card_of_match);
+
+static int axg_card_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct axg_card *priv;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, priv);
+ snd_soc_card_set_drvdata(&priv->card, priv);
+
+ priv->card.owner = THIS_MODULE;
+ priv->card.dev = dev;
+
+ ret = snd_soc_of_parse_card_name(&priv->card, PREFIX "name");
+ if (ret < 0)
+ return ret;
+
+ ret = axg_card_parse_of_optional(&priv->card, PREFIX "routing",
+ snd_soc_of_parse_audio_routing);
+ if (ret) {
+ dev_err(dev, "error while parsing routing\n");
+ return ret;
+ }
+
+ ret = axg_card_parse_of_optional(&priv->card, PREFIX "widgets",
+ snd_soc_of_parse_audio_simple_widgets);
+ if (ret) {
+ dev_err(dev, "error while parsing widgets\n");
+ return ret;
+ }
+
+ ret = axg_card_add_links(&priv->card);
+ if (ret)
+ goto out_err;
+
+ ret = axg_card_add_aux_devices(&priv->card);
+ if (ret)
+ goto out_err;
+
+ ret = devm_snd_soc_register_card(dev, &priv->card);
+ if (ret)
+ goto out_err;
+
+ return 0;
+
+out_err:
+ axg_card_clean_references(priv);
+ return ret;
+}
+
+static int axg_card_remove(struct platform_device *pdev)
+{
+ struct axg_card *priv = platform_get_drvdata(pdev);
+
+ axg_card_clean_references(priv);
+
+ return 0;
+}
+
+static struct platform_driver axg_card_pdrv = {
+ .probe = axg_card_probe,
+ .remove = axg_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 <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-starfive.git / commitdiff