ASoC: amd: acp: add code for scanning acp pdm controller

Add common code for scanning acp pdm controller and create
platform device for the same.

Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@amd.com>
Link: https://lore.kernel.org/r/20231021145110.478744-6-Syed.SabaKareem@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/acp/acp-legacy-common.c

@@ -16,6 +16,10 @@
 #include <linux/pci.h>
 #include <linux/export.h>
 
+#define ACP_RENOIR_PDM_ADDR	0x02
+#define ACP_REMBRANDT_PDM_ADDR	0x03
+#define ACP63_PDM_ADDR		0x02
+
 void acp_enable_interrupts(struct acp_dev_data *adata)
 {
 	struct acp_resource *rsrc = adata->rsrc;
@@ -348,4 +352,52 @@ int smn_read(struct pci_dev *dev, u32 smn_addr)
 }
 EXPORT_SYMBOL_NS_GPL(smn_read, SND_SOC_ACP_COMMON);
 
+int check_acp_pdm(struct pci_dev *pci, struct acp_chip_info *chip)
+{
+	struct acpi_device *pdm_dev;
+	const union acpi_object *obj;
+	u32 pdm_addr, val;
+
+	val = readl(chip->base + ACP_PIN_CONFIG);
+	switch (val) {
+	case ACP_CONFIG_4:
+	case ACP_CONFIG_5:
+	case ACP_CONFIG_6:
+	case ACP_CONFIG_7:
+	case ACP_CONFIG_8:
+	case ACP_CONFIG_10:
+	case ACP_CONFIG_11:
+	case ACP_CONFIG_12:
+	case ACP_CONFIG_13:
+	case ACP_CONFIG_14:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (chip->acp_rev) {
+	case ACP3X_DEV:
+		pdm_addr = ACP_RENOIR_PDM_ADDR;
+		break;
+	case ACP6X_DEV:
+		pdm_addr = ACP_REMBRANDT_PDM_ADDR;
+		break;
+	case ACP63_DEV:
+		pdm_addr = ACP63_PDM_ADDR;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	pdm_dev = acpi_find_child_device(ACPI_COMPANION(&pci->dev), pdm_addr, 0);
+	if (pdm_dev) {
+		if (!acpi_dev_get_property(pdm_dev, "acp-audio-device-type",
+					   ACPI_TYPE_INTEGER, &obj) &&
+					   obj->integer.value == pdm_addr)
+			return 0;
+	}
+	return -ENODEV;
+}
+EXPORT_SYMBOL_NS_GPL(check_acp_pdm, SND_SOC_ACP_COMMON);
+
 MODULE_LICENSE("Dual BSD/GPL");

sound/soc/amd/acp/acp-pci.c

@@ -55,7 +55,7 @@ static int acp_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id
 	int ret;
 
 	flag = snd_amd_acp_find_config(pci);
-	if (flag != FLAG_AMD_LEGACY)
+	if (flag != FLAG_AMD_LEGACY && flag != FLAG_AMD_LEGACY_ONLY_DMIC)
 		return -ENODEV;
 
 	chip = devm_kzalloc(&pci->dev, sizeof(*chip), GFP_KERNEL);
@@ -129,6 +129,13 @@ static int acp_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id
 		}
 	}
 
+	if (flag == FLAG_AMD_LEGACY_ONLY_DMIC) {
+		ret = check_acp_pdm(pci, chip);
+		if (ret < 0)
+			goto skip_pdev_creation;
+	}
+
+	chip->flag = flag;
 	memset(&pdevinfo, 0, sizeof(pdevinfo));
 
 	pdevinfo.name = chip->name;
@@ -145,6 +152,8 @@ static int acp_pci_probe(struct pci_dev *pci, const struct pci_device_id *pci_id
 		ret = PTR_ERR(pdev);
 		goto unregister_dmic_dev;
 	}
+
+skip_pdev_creation:
 	chip->chip_pdev = pdev;
 	dev_set_drvdata(&pci->dev, chip);
 	pm_runtime_set_autosuspend_delay(&pci->dev, 2000);

sound/soc/amd/acp/amd.h

@@ -133,6 +133,7 @@ struct acp_chip_info {
 	unsigned int acp_rev;	/* ACP Revision id */
 	void __iomem *base;	/* ACP memory PCI base */
 	struct platform_device *chip_pdev;
+	unsigned int flag;	/* Distinguish b/w Legacy or Only PDM */
 };
 
 struct acp_stream {
@@ -188,6 +189,25 @@ struct acp_dev_data {
 	u32 xfer_rx_resolution[3];
 };
 
+enum acp_config {
+	ACP_CONFIG_0 = 0,
+	ACP_CONFIG_1,
+	ACP_CONFIG_2,
+	ACP_CONFIG_3,
+	ACP_CONFIG_4,
+	ACP_CONFIG_5,
+	ACP_CONFIG_6,
+	ACP_CONFIG_7,
+	ACP_CONFIG_8,
+	ACP_CONFIG_9,
+	ACP_CONFIG_10,
+	ACP_CONFIG_11,
+	ACP_CONFIG_12,
+	ACP_CONFIG_13,
+	ACP_CONFIG_14,
+	ACP_CONFIG_15,
+};
+
 extern const struct snd_soc_dai_ops asoc_acp_cpu_dai_ops;
 extern const struct snd_soc_dai_ops acp_dmic_dai_ops;
 
@@ -214,6 +234,8 @@ void restore_acp_pdm_params(struct snd_pcm_substream *substream,
 int restore_acp_i2s_params(struct snd_pcm_substream *substream,
 			   struct acp_dev_data *adata, struct acp_stream *stream);
 
+int check_acp_pdm(struct pci_dev *pci, struct acp_chip_info *chip);
+
 static inline u64 acp_get_byte_count(struct acp_dev_data *adata, int dai_id, int direction)
 {
 	u64 byte_count = 0, low = 0, high = 0;

sound/soc/amd/acp/chip_offset_byte.h

@@ -19,6 +19,7 @@
 #define ACP_PGFSM_STATUS                        0x1420
 #define ACP_SOFT_RESET                          0x1000
 #define ACP_CONTROL                             0x1004
+#define ACP_PIN_CONFIG				0x1440
 
 #define ACP_EXTERNAL_INTR_REG_ADDR(adata, offset, ctrl) \
 	(adata->acp_base + adata->rsrc->irq_reg_offset + offset + (ctrl * 0x04))

sound/soc/amd/mach-config.h

@@ -15,6 +15,7 @@
 #define FLAG_AMD_SOF			BIT(1)
 #define FLAG_AMD_SOF_ONLY_DMIC		BIT(2)
 #define FLAG_AMD_LEGACY			BIT(3)
+#define FLAG_AMD_LEGACY_ONLY_DMIC	BIT(4)
 
 #define ACP_PCI_DEV_ID			0x15E2