ASoC: SOF: IPC4: add sdw blob

Add IPC4 SoundWire blob. It includes a common IPC4 gateway and a multiple
ALH configuration struct which is used for storing the aggregated
SoundWire stream information.
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20220609032643.916882-24-ranjani.sridharan@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/ipc4-topology.c

@@ -476,6 +476,20 @@ static int sof_ipc4_widget_setup_comp_dai(struct snd_sof_widget *swidget)
 	ipc4_copier->data.gtw_cfg.node_id = SOF_IPC4_NODE_TYPE(node_type);
 
 	switch (ipc4_copier->dai_type) {
+	case SOF_DAI_INTEL_ALH:
+	{
+		struct sof_ipc4_alh_configuration_blob *blob;
+
+		blob = kzalloc(sizeof(*blob), GFP_KERNEL);
+		if (!blob) {
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		ipc4_copier->copier_config = (uint32_t *)blob;
+		ipc4_copier->data.gtw_cfg.config_length = sizeof(*blob) >> 2;
+		break;
+	}
 	case SOF_DAI_INTEL_SSP:
 		/* set SSP DAI index as the node_id */
 		ipc4_copier->data.gtw_cfg.node_id |=
@@ -1053,6 +1067,36 @@ sof_ipc4_prepare_copier_module(struct snd_sof_widget *swidget,
 	if (ret < 0)
 		return ret;
 
+	switch (swidget->id) {
+	case snd_soc_dapm_dai_in:
+	case snd_soc_dapm_dai_out:
+	{
+		/*
+		 * Only SOF_DAI_INTEL_ALH needs copier_data to set blob.
+		 * That's why only ALH dai's blob is set after sof_ipc4_init_audio_fmt
+		 */
+		if (ipc4_copier->dai_type == SOF_DAI_INTEL_ALH) {
+			struct sof_ipc4_alh_configuration_blob *blob;
+			u32 ch_map;
+			int i;
+
+			blob = (struct sof_ipc4_alh_configuration_blob *)ipc4_copier->copier_config;
+			/* TODO: add aggregation mode support */
+			blob->alh_cfg.count = 1;
+			blob->alh_cfg.mapping[0].alh_id = copier_data->gtw_cfg.node_id;
+			blob->gw_attr.lp_buffer_alloc = 0;
+
+			/* Get channel_mask from ch_map */
+			ch_map = copier_data->base_config.audio_fmt.ch_map;
+			for (i = 0; ch_map; i++) {
+				if ((ch_map & 0xf) != 0xf)
+					blob->alh_cfg.mapping[0].channel_mask |= BIT(i);
+				ch_map >>= 4;
+			}
+		}
+	}
+	}
+
 	/* modify the input params for the next widget */
 	fmt = hw_param_mask(pipeline_params, SNDRV_PCM_HW_PARAM_FORMAT);
 	out_sample_valid_bits =

sound/soc/sof/ipc4-topology.h

@@ -40,6 +40,8 @@
 #define SOF_IPC4_GAIN_ALL_CHANNELS_MASK 0xffffffff
 #define SOF_IPC4_VOL_ZERO_DB	0x7fffffff
 
+#define ALH_MAX_NUMBER_OF_GTW   16
+
 /**
  * struct sof_ipc4_pipeline - pipeline config data
  * @priority: Priority of this pipeline
@@ -112,6 +114,29 @@ struct sof_ipc4_gtw_attributes {
 	uint32_t rsvd : 30;
 };
 
+/** struct sof_ipc4_alh_multi_gtw_cfg: ALH gateway cfg data
+ * @count: Number of streams (valid items in mapping array)
+ * @alh_id: ALH stream id of a single ALH stream aggregated
+ * @channel_mask: Channel mask
+ * @mapping: ALH streams
+ */
+struct sof_ipc4_alh_multi_gtw_cfg {
+	uint32_t count;
+	struct {
+		uint32_t alh_id;
+		uint32_t channel_mask;
+	} mapping[ALH_MAX_NUMBER_OF_GTW];
+} __packed;
+
+/** struct sof_ipc4_alh_configuration_blob: ALH blob
+ * @gw_attr: Gateway attributes
+ * @alh_cfg: ALH configuration data
+ */
+struct sof_ipc4_alh_configuration_blob {
+	struct sof_ipc4_gtw_attributes gw_attr;
+	struct sof_ipc4_alh_multi_gtw_cfg alh_cfg;
+};
+
 /**
  * struct sof_ipc4_copier - copier config data
  * @data: IPC copier data