ASoC: SOF: Add support for MICFIL PDM interface

Merge series from Daniel Baluta <daniel.baluta@oss.nxp.com>:

This is used for configuring MICFIL PDM with i.MX8MPlus. Tested
with 8MIC-RPI-MX8 microphone array.

include/sound/sof/dai-imx.h

@@ -51,4 +51,11 @@ struct sof_ipc_dai_sai_params {
 	uint16_t tdm_slot_width;
 	uint16_t reserved2;	/* alignment */
 } __packed;
+
+/* MICFIL Configuration Request - SOF_IPC_DAI_MICFIL_CONFIG */
+struct sof_ipc_dai_micfil_params {
+	uint32_t pdm_rate;
+	uint32_t pdm_ch;
+} __packed;
+
 #endif

include/sound/sof/dai.h

@@ -88,6 +88,7 @@ enum sof_ipc_dai_type {
 	SOF_DAI_AMD_HS,			/**< Amd HS */
 	SOF_DAI_AMD_SP_VIRTUAL,		/**< AMD ACP SP VIRTUAL */
 	SOF_DAI_AMD_HS_VIRTUAL,		/**< AMD ACP HS VIRTUAL */
+	SOF_DAI_IMX_MICFIL,		/** < i.MX MICFIL PDM */
 };
 
 /* general purpose DAI configuration */
@@ -117,6 +118,7 @@ struct sof_ipc_dai_config {
 		struct sof_ipc_dai_acpdmic_params acpdmic;
 		struct sof_ipc_dai_acp_params acphs;
 		struct sof_ipc_dai_mtk_afe_params afe;
+		struct sof_ipc_dai_micfil_params micfil;
 	};
 } __packed;
 

include/uapi/sound/sof/tokens.h

@@ -213,4 +213,8 @@
 #define SOF_TKN_AMD_ACPI2S_CH			1701
 #define SOF_TKN_AMD_ACPI2S_TDM_MODE		1702
 
+/* MICFIL PDM */
+#define SOF_TKN_IMX_MICFIL_RATE			2000
+#define SOF_TKN_IMX_MICFIL_CH			2001
+
 #endif

sound/soc/sof/imx/imx8m.c

@@ -313,6 +313,13 @@ static struct snd_soc_dai_driver imx8m_dai[] = {
 		.channels_max = 32,
 	},
 },
+{
+	.name = "micfil",
+	.capture = {
+		.channels_min = 1,
+		.channels_max = 8,
+	},
+},
 };
 
 static int imx8m_dsp_set_power_state(struct snd_sof_dev *sdev,

sound/soc/sof/ipc3-pcm.c

@@ -384,6 +384,17 @@ static int sof_ipc3_pcm_dai_link_fixup(struct snd_soc_pcm_runtime *rtd,
 		dev_dbg(component->dev, "AMD_DMIC channels_min: %d channels_max: %d\n",
 			channels->min, channels->max);
 		break;
+	case SOF_DAI_IMX_MICFIL:
+		rate->min = private->dai_config->micfil.pdm_rate;
+		rate->max = private->dai_config->micfil.pdm_rate;
+		channels->min = private->dai_config->micfil.pdm_ch;
+		channels->max = private->dai_config->micfil.pdm_ch;
+
+		dev_dbg(component->dev,
+			"MICFIL PDM rate_min: %d rate_max: %d\n", rate->min, rate->max);
+		dev_dbg(component->dev, "MICFIL PDM channels_min: %d channels_max: %d\n",
+			channels->min, channels->max);
+		break;
 	default:
 		dev_err(component->dev, "Invalid DAI type %d\n", private->dai_config->type);
 		break;

sound/soc/sof/ipc3-topology.c

@@ -286,6 +286,16 @@ static const struct sof_topology_token acpi2s_tokens[] = {
 		offsetof(struct sof_ipc_dai_acp_params, tdm_mode)},
 };
 
+/* MICFIL PDM */
+static const struct sof_topology_token micfil_pdm_tokens[] = {
+	{SOF_TKN_IMX_MICFIL_RATE,
+		SND_SOC_TPLG_TUPLE_TYPE_WORD, get_token_u32,
+		offsetof(struct sof_ipc_dai_micfil_params, pdm_rate)},
+	{SOF_TKN_IMX_MICFIL_CH,
+		SND_SOC_TPLG_TUPLE_TYPE_WORD, get_token_u32,
+		offsetof(struct sof_ipc_dai_micfil_params, pdm_ch)},
+};
+
 /* Core tokens */
 static const struct sof_topology_token core_tokens[] = {
 	{SOF_TKN_COMP_CORE_ID, SND_SOC_TPLG_TUPLE_TYPE_WORD, get_token_u32,
@@ -322,6 +332,8 @@ static const struct sof_token_info ipc3_token_list[SOF_TOKEN_COUNT] = {
 	[SOF_AFE_TOKENS] = {"AFE tokens", afe_tokens, ARRAY_SIZE(afe_tokens)},
 	[SOF_ACPDMIC_TOKENS] = {"ACPDMIC tokens", acpdmic_tokens, ARRAY_SIZE(acpdmic_tokens)},
 	[SOF_ACPI2S_TOKENS]   = {"ACPI2S tokens", acpi2s_tokens, ARRAY_SIZE(acpi2s_tokens)},
+	[SOF_MICFIL_TOKENS] = {"MICFIL PDM tokens",
+		micfil_pdm_tokens, ARRAY_SIZE(micfil_pdm_tokens)},
 };
 
 /**
@@ -1136,6 +1148,37 @@ static int sof_link_esai_load(struct snd_soc_component *scomp, struct snd_sof_da
 	return 0;
 }
 
+static int sof_link_micfil_load(struct snd_soc_component *scomp, struct snd_sof_dai_link *slink,
+				struct sof_ipc_dai_config *config, struct snd_sof_dai *dai)
+{
+	struct snd_soc_tplg_hw_config *hw_config = slink->hw_configs;
+	struct sof_dai_private_data *private = dai->private;
+	u32 size = sizeof(*config);
+	int ret;
+
+       /* handle master/slave and inverted clocks */
+	sof_dai_set_format(hw_config, config);
+
+	config->hdr.size = size;
+
+	/* parse the required set of MICFIL PDM tokens based on num_hw_cfgs */
+	ret = sof_update_ipc_object(scomp, &config->micfil, SOF_MICFIL_TOKENS, slink->tuples,
+				    slink->num_tuples, size, slink->num_hw_configs);
+	if (ret < 0)
+		return ret;
+
+	dev_info(scomp->dev, "MICFIL PDM config dai_index %d channel %d rate %d\n",
+		 config->dai_index, config->micfil.pdm_ch, config->micfil.pdm_rate);
+
+	dai->number_configs = 1;
+	dai->current_config = 0;
+	private->dai_config = kmemdup(config, size, GFP_KERNEL);
+	if (!private->dai_config)
+		return -ENOMEM;
+
+	return 0;
+}
+
 static int sof_link_acp_dmic_load(struct snd_soc_component *scomp, struct snd_sof_dai_link *slink,
 				  struct sof_ipc_dai_config *config, struct snd_sof_dai *dai)
 {
@@ -1559,6 +1602,9 @@ static int sof_ipc3_widget_setup_comp_dai(struct snd_sof_widget *swidget)
 		case SOF_DAI_IMX_ESAI:
 			ret = sof_link_esai_load(scomp, slink, config, dai);
 			break;
+		case SOF_DAI_IMX_MICFIL:
+			ret = sof_link_micfil_load(scomp, slink, config, dai);
+			break;
 		case SOF_DAI_AMD_BT:
 			ret = sof_link_acp_bt_load(scomp, slink, config, dai);
 			break;

sound/soc/sof/sof-audio.h

@@ -275,6 +275,7 @@ enum sof_tokens {
 	SOF_GAIN_TOKENS,
 	SOF_ACPDMIC_TOKENS,
 	SOF_ACPI2S_TOKENS,
+	SOF_MICFIL_TOKENS,
 
 	/* this should be the last */
 	SOF_TOKEN_COUNT,

sound/soc/sof/topology.c

@@ -296,6 +296,7 @@ static const struct sof_dai_types sof_dais[] = {
 	{"AFE", SOF_DAI_MEDIATEK_AFE},
 	{"ACPSP_VIRTUAL", SOF_DAI_AMD_SP_VIRTUAL},
 	{"ACPHS_VIRTUAL", SOF_DAI_AMD_HS_VIRTUAL},
+	{"MICFIL", SOF_DAI_IMX_MICFIL},
 
 };
 
@@ -1960,6 +1961,10 @@ static int sof_link_load(struct snd_soc_component *scomp, int index, struct snd_
 		token_id = SOF_ACPI2S_TOKENS;
 		num_tuples += token_list[SOF_ACPI2S_TOKENS].count;
 		break;
+	case SOF_DAI_IMX_MICFIL:
+		token_id = SOF_MICFIL_TOKENS;
+		num_tuples += token_list[SOF_MICFIL_TOKENS].count;
+		break;
 	default:
 		break;
 	}