acpi: Add SPMI table

Add the SPMI table as defined in the IPMI spec v2:
https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ipmi-second-gen-interface-spec-v2-rev1-1.pdf

Tested on Wedge100s.

Change-Id: Idff5134ce4c124f7e76acb0080da404b0c0dfffe
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33487
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/x86/acpi.c

@@ -772,6 +772,57 @@ void acpi_create_vfct(struct device *device,
 	header->checksum = acpi_checksum((void *)vfct, header->length);
 }
 
+void acpi_create_ipmi(struct device *device,
+		      struct acpi_spmi *spmi,
+		      const u16 ipmi_revision,
+		      const acpi_addr_t *addr,
+		      const enum acpi_ipmi_interface_type type,
+		      const s8 gpe_interrupt,
+		      const u32 apic_interrupt,
+		      const u32 uid)
+{
+	acpi_header_t *header = &(spmi->header);
+	memset((void *)spmi, 0, sizeof(struct acpi_spmi));
+
+	/* Fill out header fields. */
+	memcpy(header->signature, "SPMI", 4);
+	memcpy(header->oem_id, OEM_ID, 6);
+	memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
+	memcpy(header->asl_compiler_id, ASLC, 4);
+
+	header->asl_compiler_revision = asl_revision;
+	header->length = sizeof(struct acpi_spmi);
+	header->revision = get_acpi_table_revision(SPMI);
+
+	spmi->reserved = 1;
+
+	if (device->path.type == DEVICE_PATH_PCI) {
+		spmi->pci_device_flag = ACPI_IPMI_PCI_DEVICE_FLAG;
+		spmi->pci_bus = device->bus->secondary;
+		spmi->pci_device = device->path.pci.devfn >> 3;
+		spmi->pci_function = device->path.pci.devfn & 0x7;
+	} else if (type != IPMI_INTERFACE_SSIF) {
+		memcpy(spmi->uid, &uid, sizeof(spmi->uid));
+	}
+
+	spmi->base_address = *addr;
+	spmi->specification_revision = ipmi_revision;
+
+	spmi->interface_type = type;
+
+	if (gpe_interrupt >= 0 && gpe_interrupt < 32) {
+		spmi->gpe = gpe_interrupt;
+		spmi->interrupt_type |= ACPI_IPMI_INT_TYPE_SCI;
+	}
+	if (apic_interrupt > 0) {
+		spmi->global_system_interrupt = apic_interrupt;
+		spmi->interrupt_type |= ACPI_IPMI_INT_TYPE_APIC;
+	}
+
+	/* Calculate checksum. */
+	header->checksum = acpi_checksum((void *)spmi, header->length);
+}
+
 void acpi_create_ivrs(acpi_ivrs_t *ivrs,
 		      unsigned long (*acpi_fill_ivrs)(acpi_ivrs_t *ivrs_struct,
 		      unsigned long current))
@@ -1490,6 +1541,8 @@ int get_acpi_table_revision(enum acpi_tables table)
 		return 1;
 	case SLIT: /* ACPI 2.0 upto 6.3: 1 */
 		return 1;
+	case SPMI: /* IMPI 2.0 */
+		return 5;
 	case HPET: /* Currently 1. Table added in ACPI 2.0. */
 		return 1;
 	case VFCT: /* ACPI 2.0/3.0/4.0: 1 */

src/arch/x86/include/arch/acpi.h

@@ -82,7 +82,7 @@ enum acpi_tables {
 	BERT, DBG2, DMAR, DSDT, FACS, FADT, HEST, HPET, IVRS, MADT, MCFG,
 	RSDP, RSDT, SLIT, SRAT, SSDT, TCPA, TPM2, XSDT, ECDT,
 	/* Additional proprietary tables used by coreboot */
-	VFCT, NHLT
+	VFCT, NHLT, SPMI
 };
 
 /* RSDP (Root System Description Pointer) */
@@ -782,6 +782,43 @@ enum acpi_upc_type {
 	UPC_TYPE_HUB
 };
 
+enum acpi_ipmi_interface_type {
+	IPMI_INTERFACE_RESERVED = 0,
+	IPMI_INTERFACE_KCS,
+	IPMI_INTERFACE_SMIC,
+	IPMI_INTERFACE_BT,
+	IPMI_INTERFACE_SSIF,
+};
+
+#define ACPI_IPMI_PCI_DEVICE_FLAG	(1 << 0)
+#define ACPI_IPMI_INT_TYPE_SCI		(1 << 0)
+#define ACPI_IPMI_INT_TYPE_APIC		(1 << 1)
+
+/* ACPI IPMI 2.0 */
+struct acpi_spmi {
+	struct acpi_table_header header;
+	u8 interface_type;
+	u8 reserved;
+	u16 specification_revision;
+	u8 interrupt_type;
+	u8 gpe;
+	u8 reserved2;
+	u8 pci_device_flag;
+
+	u32 global_system_interrupt;
+	acpi_addr_t base_address;
+	union {
+		struct {
+			u8 pci_segment_group;
+			u8 pci_bus;
+			u8 pci_device;
+			u8 pci_function;
+		};
+		u8 uid[4];
+	};
+	u8 reserved3;
+} __packed;
+
 unsigned long fw_cfg_acpi_tables(unsigned long start);
 
 /* These are implemented by the target port or north/southbridge. */
@@ -834,6 +871,15 @@ void acpi_create_vfct(struct device *device,
 				struct acpi_vfct *vfct_struct,
 				unsigned long current));
 
+void acpi_create_ipmi(struct device *device,
+		      struct acpi_spmi *spmi,
+		      const u16 ipmi_revision,
+		      const acpi_addr_t *addr,
+		      const enum acpi_ipmi_interface_type type,
+		      const s8 gpe_interrupt,
+		      const u32 apic_interrupt,
+		      const u32 uid);
+
 void acpi_create_ivrs(acpi_ivrs_t *ivrs,
 		      unsigned long (*acpi_fill_ivrs)(acpi_ivrs_t *ivrs_struct,
 		      unsigned long current));