soc/intel/common/block/usb4/usb4.c: Add TBT DMA _DSM

Mimic Intel's reference code.

Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>

Author: miczyg1

src/soc/intel/common/block/usb4/usb4.c

@@ -10,6 +10,7 @@
 
 #define INTEL_TBT_IMR_VALID_UUID	"C44D002F-69F9-4E7D-A904-A7BAABDF43F7"
 #define INTEL_TBT_WAKE_SUPPORTED_UUID	"6C501103-C189-4296-BA72-9BF5A26EBE5D"
+#define INTEL_TBT_PCIE_SUPPORTED_UUID	"197DB5E0-F095-4F33-B915-71DD70833E55"
 
 #if CONFIG(HAVE_ACPI_TABLES)
 static const char *tbt_dma_acpi_name(const struct device *dev)
@@ -24,6 +25,51 @@ static const char *tbt_dma_acpi_name(const struct device *dev)
 	}
 }
 
+static bool tbt_pcie_enabled(struct device *tbt_pcie)
+{
+	return (tbt_pcie && tbt_pcie->enabled);
+}
+
+static void tbt_pcie_ports_present(void *arg)
+{
+	uint8_t tbt0_bitmask, tbt1_bitmask;
+
+	tbt0_bitmask = tbt_pcie_enabled(SA_DEV_TBT0) | (tbt_pcie_enabled(SA_DEV_TBT1) << 1);
+	tbt1_bitmask = tbt_pcie_enabled(SA_DEV_TBT2) | (tbt_pcie_enabled(SA_DEV_TBT3) << 1);
+
+	/* Name (PCPN, Buffer (1) {0}) */
+	acpigen_write_name("PCPN");
+	acpigen_emit_byte(BUFFER_OP);
+	acpigen_write_len_f();
+	acpigen_emit_byte(1);
+	acpigen_emit_byte(0);
+	acpigen_pop_len();
+
+	/* If DUID == 1 set TBT0/TBT1 bitmask, else set TBT2/TBT3 bitmask */
+	acpigen_write_if_lequal_namestr_int("DUID", 0);
+	acpigen_write_store_int_to_namestr(tbt0_bitmask, "PCPN");
+	acpigen_write_else();
+	acpigen_write_store_int_to_namestr(tbt1_bitmask, "PCPN");
+	acpigen_write_if_end();
+
+	acpigen_write_return_namestr("PCPN");
+}
+
+static void tbt_dma_caps_info(void *arg)
+{
+	/*
+	 * Bit0 is IMR_VALID, bit1 is WAKE_SUPPORTED, bit2 is vPro Dock supported.
+	 * We hardcode both IMR_VALID and WAKE_SUPPORTED to 1.
+	 */
+	acpigen_write_return_singleton_buffer(3);
+}
+
+static void (*tbt_pcie_helpers[])(void *) = {
+	NULL,					/* enumerate functions (autogenerated) */
+	tbt_pcie_ports_present,			/* Return supported TBT PCIe */
+	tbt_dma_caps_info,			/* Return supported TBT DMA capabilities */
+};
+
 static void tbt_dma_fill_ssdt(const struct device *dev)
 {
 	struct acpi_dp *dsd, *pkg;
@@ -47,6 +93,11 @@ static void tbt_dma_fill_ssdt(const struct device *dev)
 	acpi_dp_add_package(dsd, pkg);
 	acpi_dp_write(dsd);
 
+	acpigen_write_dsm(INTEL_TBT_PCIE_SUPPORTED_UUID,
+			  tbt_pcie_helpers,
+			  ARRAY_SIZE(tbt_pcie_helpers),
+			  NULL);
+
 	acpigen_pop_len(); /* Scope */
 }
 #endif

src/soc/intel/meteorlake/include/soc/pci_devs.h

@@ -241,5 +241,9 @@
 #define SA_DEVFN_ROOT		PCI_DEVFN_ROOT
 #define SA_DEVFN_TCSS_DMA0	PCI_DEVFN_TCSS_DMA0
 #define SA_DEVFN_TCSS_DMA1	PCI_DEVFN_TCSS_DMA1
+#define SA_DEV_TBT0		PCI_DEV_TBT0
+#define SA_DEV_TBT1		PCI_DEV_TBT1
+#define SA_DEV_TBT2		PCI_DEV_TBT2
+#define SA_DEV_TBT3		PCI_DEV_TBT3
 #define SA_DEV_IGD		PCI_DEV_IGD
 #define SA_DEVFN_IGD		PCI_DEVFN_IGD