topology1: Add support for Virtual DAI for i.MX8

Add a new topology file for i.MX8 platforms that enables Virtual DAI
support, allowing software-based audio pipelines without physical DAI
hardware.

Signed-off-by: Suraj Sonawane <surajsonawane0215@gmail.com>

Author: SurajSonawane2415

tools/topology/topology1/CMakeLists.txt

@@ -71,6 +71,7 @@ set(TPLGS
 	"sof-imx8mp-compr-pcm-cap-wm8960\;sof-imx8mp-compr-pcm-cap-wm8960"
 	"sof-imx8mp-compr-wm8960\;sof-imx8mp-compr-wm8960\;-DCODEC=wm8960\;-DRATE=48000"
 	"sof-imx8mp-compr-wm8960\;sof-imx8mp-compr-wm8962\;-DCODEC=wm8962\;-DRATE=48000"
+	"sof-imx8-virtual\;sof-imx8-virtual"
 	## end i.MX8MP topologies
 
 	## i.MX8ULP topologies

tools/topology/topology1/m4/dai.m4

@@ -155,7 +155,7 @@ define(`DO_DAI_CONFIG',
 `'
 `	id		"'$3`"'
 `'
-`	ifelse($1, `SSP', $5, $1, `HDA', $5, $1, `ALH', $5, $1, `ESAI', $5, $1, `SAI', $5, $1, `MICFIL', $5, $1, `AFE', $5, $1, `ACP', $5, $1, `ACPSP', $5, $1,`ACPSP_VIRTUAL', $5, $1, `ACPHS', $5, $1, `ACPHS_VIRTUAL', $5, $1, `ACP_SDW', $5, $1, `ACPDMIC', $5, `}')'
+`	ifelse($1, `SSP', $5, $1, `HDA', $5, $1, `ALH', $5, $1, `ESAI', $5, $1, `SAI', $5, $1, `MICFIL', $5, $1, `AFE', $5, $1, `ACP', $5, $1, `ACPSP', $5, $1,`ACPSP_VIRTUAL', $5, $1, `ACPHS', $5, $1, `ACPHS_VIRTUAL', $5, $1, `ACP_SDW', $5, $1, `ACPDMIC', $5, $1, `DAI_VIRTUAL', $5, `}')'
 `ifelse($1, `DMIC', $5, `')'
 `SectionVendorTuples."'N_DAI_CONFIG($1$2)`_tuples_common" {'
 `	tokens "sof_dai_tokens"'

tools/topology/topology1/platform/common/virtual-dai.m4

@@ -0,0 +1,45 @@
+divert(-1)
+
+dnl Virtual DAI related macros
+
+dnl DAI_VIRTUAL_CLOCK(clock, freq, codec_provider, polarity)
+dnl polarity is optional
+define(`DAI_VIRTUAL_CLOCK',
+	$1		STR($3)
+	$1_freq		STR($2))
+	`ifelse($4, `inverted', `$1_invert	"true"',`')')
+
+dnl DAI_VIRTUAL_TDM(slots, width, tx_mask, rx_mask)
+define(`DAI_VIRTUAL_TDM',
+`	tdm_slots	'STR($1)
+`	tdm_slot_width	'STR($2)
+`	tx_slots	'STR($3)
+`	rx_slots	'STR($4)
+)
+
+dnl DAI_VIRTUAL_CONFIG(format, mclk, bclk, fsync, tdm, config_data)
+define(`DAI_VIRTUAL_CONFIG',
+`	format		"'$1`"'
+`	'$2
+`	'$3
+`	'$4
+`	'$5
+`}'
+$6
+)
+
+dnl DAI_VIRTUAL_CONFIG_DATA(type, idx, dummy_id)
+dnl dummy_id is optional
+define(`DAI_VIRTUAL_CONFIG_DATA',
+`SectionVendorTuples."'N_DAI_CONFIG($1$2)`_tuples" {'
+`	tokens "sof_virtual_tokens"'
+`	tuples."short" {'
+`		SOF_TKN_DAI_VIRTUAL_MCLK_ID'	ifelse($3, `', "0", STR($3))
+`	}'
+`}'
+`SectionData."'N_DAI_CONFIG($1$2)`_data" {'
+`	tuples "'N_DAI_CONFIG($1$2)`_tuples"'
+`}'
+)
+
+divert(0)dnl

tools/topology/topology1/sof-imx8-virtual.m4

@@ -0,0 +1,71 @@
+#
+# Topology for i.MX8 board using Virtual DAI (no physical codec)
+#
+
+# Include topology builder
+include(`utils.m4')
+include(`dai.m4')
+include(`pipeline.m4')
+include(`virtual-dai.m4')
+include(`pcm.m4')
+include(`buffer.m4')
+
+# Include TLV library
+include(`common/tlv.m4')
+
+# Include Token library
+include(`sof/tokens.m4')
+
+# Include DSP configuration
+include(`platform/imx/imx8.m4')
+
+#
+# Define the pipelines
+#
+# PCM0 ---> Volume ---> Virtual DAI0 (NoCodec)
+#
+
+dnl PIPELINE_PCM_ADD(pipeline,
+dnl     pipe id, pcm, max channels, format,
+dnl     period, priority, core,
+dnl     pcm_min_rate, pcm_max_rate, pipeline_rate,
+dnl     time_domain, sched_comp)
+
+# Low Latency playback pipeline 1 on PCM 0 using max 2 channels of s32le
+PIPELINE_PCM_ADD(sof/pipe-volume-playback.m4,
+	1, 0, 2, s32le,
+	1000, 0, 0,
+	8000, 96000, 48000)
+
+#
+# DAIs configuration
+#
+
+dnl DAI_ADD(pipeline,
+dnl     pipe id, dai type, dai_index, dai_be,
+dnl     buffer, periods, format,
+dnl     deadline, priority, core, time_domain)
+
+DAI_ADD(sof/pipe-dai-playback.m4,
+	1, DAI_VIRTUAL, 7, NoCodec-0,
+	PIPELINE_SOURCE_1, 2, s32le,
+	1000, 0, 0, SCHEDULE_TIME_DOMAIN_TIMER)
+
+#
+# PCM interface
+#
+
+dnl PCM_PLAYBACK_ADD(name, pcm_id, playback)
+PCM_PLAYBACK_ADD(Port0, 0, PIPELINE_PCM_1)
+
+#
+# DAI Configuration
+#
+
+dnl DAI_CONFIG(type, dai_index, link_id, name, config)
+DAI_CONFIG(DAI_VIRTUAL, 7, 0, NoCodec-0,
+	DAI_VIRTUAL_CONFIG(I2S, DAI_VIRTUAL_CLOCK(mclk, 0, dai_provider),
+		DAI_VIRTUAL_CLOCK(bclk, 0, dai_provider),
+		DAI_VIRTUAL_CLOCK(fsync, 0, dai_provider),
+		DAI_VIRTUAL_TDM(2, 32, 3, 3),
+		DAI_VIRTUAL_CONFIG_DATA(DAI_VIRTUAL, 7, 0)))

tools/topology/topology1/sof/tokens.m4

@@ -157,3 +157,7 @@ SectionVendorTokens."sof_acp_sdw_tokens" {
 	SOF_TKN_AMD_ACP_SDW_SAMPLERATE		"2100"
 	SOF_TKN_AMD_ACP_SDW_CH			"2101"
 }
+
+SectionVendorTokens."sof_virtual_tokens" {
+	SOF_TKN_DAI_VIRTUAL_MCLK_ID		"2102"
+}