dai: Add support for Virtual DAI on i.MX8MP

Author: SurajSonawane2415

app/boards/imx8mp_evk_mimx8ml8_adsp.conf

@@ -10,3 +10,4 @@ CONFIG_SHARED_INTERRUPTS=y
 CONFIG_ZEPHYR_NATIVE_DRIVERS=y
 CONFIG_SAI_HAS_MCLK_CONFIG_OPTION=y
 CONFIG_CLOCK_CONTROL_FIXED_RATE_CLOCK=y
+CONFIG_DAI_VIRTUAL=y

app/boards/imx8mp_evk_mimx8ml8_adsp.overlay

@@ -27,3 +27,7 @@
 &micfil {
 	status = "okay";
 };
+
+&virtual_dai14 {
+	status = "okay";
+};

src/audio/dai-zephyr.c

@@ -194,6 +194,10 @@ __cold int dai_set_config(struct dai *dai, struct ipc_config_dai *common_config,
 		cfg.type = DAI_IMX_MICFIL;
 		cfg_params = &sof_cfg->micfil;
 		break;
+	case SOF_DAI_VIRTUAL:
+		cfg.type = DAI_VIRTUAL;
+		cfg_params = &sof_cfg->virtual_dai;
+		break;
 	default:
 		return -EINVAL;
 	}

src/include/ipc/dai.h

@@ -94,9 +94,31 @@ enum sof_ipc_dai_type {
 	SOF_DAI_AMD_SP_VIRTUAL,		/**<Amd SP VIRTUAL */
 	SOF_DAI_AMD_HS_VIRTUAL,		/**<Amd HS VIRTUAL */
 	SOF_DAI_IMX_MICFIL,		/**< i.MX MICFIL */
-	SOF_DAI_AMD_SW_AUDIO		/**<Amd SW AUDIO */
+	SOF_DAI_AMD_SW_AUDIO,		/**<Amd SW AUDIO */
+	SOF_DAI_VIRTUAL			/**< Virtual DAI for testing/debugging*/
 };
 
+/* Virtual DAI Configuration Request - SOF_IPC_DAI_VIRTUAL_CONFIG */
+struct sof_ipc_dai_virtual_params {
+	uint32_t reserved0;
+
+	/* MCLK */
+	uint16_t reserved1;
+	uint16_t mclk_id;
+	uint32_t mclk_direction;
+
+	uint32_t mclk_rate; /* MCLK frequency in Hz */
+	uint32_t fsync_rate;
+	uint32_t bclk_rate;
+
+	/* TDM */
+	uint32_t tdm_slots;
+	uint32_t rx_slots;
+	uint32_t tx_slots;
+	uint16_t tdm_slot_width;
+	uint16_t reserved2;	/* alignment */
+} __attribute__((packed, aligned(4)));
+
 /* general purpose DAI configuration */
 struct sof_ipc_dai_config {
 	struct sof_ipc_cmd_hdr hdr;
@@ -126,6 +148,7 @@ struct sof_ipc_dai_config {
 		struct sof_ipc_dai_afe_params afe;
 		struct sof_ipc_dai_micfil_params micfil;
 		struct sof_ipc_dai_acp_sdw_params acpsdw;
+		struct sof_ipc_dai_virtual_params virtual_dai;
 	};
 } __attribute__((packed, aligned(4)));
 

src/ipc/ipc3/dai.c

@@ -63,6 +63,9 @@ int dai_config_dma_channel(struct dai_data *dd, struct comp_dev *dev, const void
 	case SOF_DAI_IMX_ESAI:
 		handshake = dai_get_handshake(dd->dai, dai->direction,
 					      dd->stream_id);
+	case SOF_DAI_VIRTUAL:
+		handshake = dai_get_handshake(dd->dai, dai->direction,
+					      dd->stream_id);
 /* TODO: remove this when transition to native drivers is complete on all NXP platforms */
 #ifndef CONFIG_ZEPHYR_NATIVE_DRIVERS
 		channel = EDMA_HS_GET_CHAN(handshake);
@@ -171,6 +174,7 @@ int ipc_dai_data_config(struct dai_data *dd, struct comp_dev *dev)
 	case SOF_DAI_IMX_MICFIL:
 	case SOF_DAI_IMX_SAI:
 	case SOF_DAI_IMX_ESAI:
+	case SOF_DAI_VIRTUAL:
 		dd->config.burst_elems = dai_get_fifo_depth(dd->dai, dai->direction);
 		break;
 	case SOF_DAI_AMD_BT:

src/lib/dai.c

@@ -185,6 +185,9 @@ const struct device *zephyr_dev[] = {
 #if CONFIG_DAI_NXP_MICFIL
 	DT_FOREACH_STATUS_OKAY(nxp_dai_micfil, GET_DEVICE_LIST)
 #endif
+#if CONFIG_DAI_VIRTUAL
+	DT_FOREACH_STATUS_OKAY(virtual_dai, GET_DEVICE_LIST)
+#endif
 };
 
 /* convert sof_ipc_dai_type to Zephyr dai_type */
@@ -218,6 +221,8 @@ static int sof_dai_type_to_zephyr(uint32_t type)
 	case SOF_DAI_AMD_HS_VIRTUAL:
 	case SOF_DAI_AMD_SW_AUDIO:
 		return -ENOTSUP;
+	case SOF_DAI_VIRTUAL:
+		return DAI_VIRTUAL;
 	default:
 		return -EINVAL;
 	}
@@ -242,6 +247,7 @@ const struct device *dai_get_device(uint32_t type, uint32_t index)
 	for (i = 0; i < ARRAY_SIZE(zephyr_dev); i++) {
 		if (dai_config_get(zephyr_dev[i], &cfg, dir))
 			continue;
+
 		if (cfg.type == z_type && cfg.dai_index == index)
 			return zephyr_dev[i];
 	}
@@ -280,6 +286,8 @@ static void dai_set_device_params(struct dai *d)
 		d->dma_dev = SOF_DMA_DEV_HDA;
 		d->dma_caps = SOF_DMA_CAP_HDA;
 		break;
+	case SOF_DAI_VIRTUAL:
+		break;
 	default:
 		break;
 	}