x86/acpi: Add VFCT table

Add VFCT table to provide PCI Optiom Rom for
AMD graphic devices.
Useful for GNU Linux payloads and embedded dual GPU systems.

Tested on Lenovo T500 with AMD RV635 as secondary gpu.

Original Change-Id: I3b4a587c71e7165338cad3aca77ed5afa085a63c
Signed-off-by: Patrick Rudolph <siro@das-labor.org>

Change-Id: I4dc00005270240c048272b2e4f52ae46ba1c9422
Reviewed-on: https://review.coreboot.org/18192
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

5 files changed, 129 insertions, 0 deletions

diff --git a/src/arch/x86/acpi.c b/src/arch/x86/acpi.c
index 53c41359d6..703bfa1e9b 100644
--- a/src/arch/x86/acpi.c
+++ b/src/arch/x86/acpi.c
@@ -589,6 +589,31 @@ void acpi_create_hpet(acpi_hpet_t *hpet)
 	header->checksum = acpi_checksum((void *)hpet, sizeof(acpi_hpet_t));
 }
 
+void acpi_create_vfct(struct device *device,
+		      struct acpi_vfct *vfct,
+		      unsigned long (*acpi_fill_vfct)(struct device *device, struct acpi_vfct *vfct_struct, unsigned long current))
+{
+	acpi_header_t *header = &(vfct->header);
+	unsigned long current = (unsigned long)vfct + sizeof(struct acpi_vfct);
+
+	memset((void *)vfct, 0, sizeof(struct acpi_vfct));
+
+	/* Fill out header fields. */
+	memcpy(header->signature, "VFCT", 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->length = sizeof(struct acpi_vfct);
+	header->revision = 1; /* ACPI 1.0: N/A, ACPI 2.0/3.0/4.0: 1 */
+
+	current = acpi_fill_vfct(device, vfct, current);
+
+	/* (Re)calculate length and checksum. */
+	header->length = current - (unsigned long)vfct;
+	header->checksum = acpi_checksum((void *)vfct, header->length);
+}
+
 void acpi_create_ivrs(acpi_ivrs_t *ivrs,
 		      unsigned long (*acpi_fill_ivrs)(acpi_ivrs_t* ivrs_struct, unsigned long current))
 {
diff --git a/src/arch/x86/include/arch/acpi.h b/src/arch/x86/include/arch/acpi.h
index 6854573d8c..9dfbe2f6c0 100644
--- a/src/arch/x86/include/arch/acpi.h
+++ b/src/arch/x86/include/arch/acpi.h
@@ -220,6 +220,30 @@ typedef struct acpi_madt {
 	u32 flags;			/* Multiple APIC flags */
 } __attribute__ ((packed)) acpi_madt_t;
 
+/* VFCT image header */
+struct acpi_vfct_image_hdr {
+	u32 PCIBus;
+	u32 PCIDevice;
+	u32 PCIFunction;
+	u16 VendorID;
+	u16 DeviceID;
+	u16 SSVID;
+	u16 SSID;
+	u32 Revision;
+	u32 ImageLength;
+	u8  VbiosContent;	// dummy - copy VBIOS here
+} __attribute__ ((packed));
+
+/* VFCT (VBIOS Fetch Table) */
+struct acpi_vfct {
+	struct acpi_table_header header;
+	u8  TableUUID[16];
+	u32 VBIOSImageOffset;
+	u32 Lib1ImageOffset;
+	u32 Reserved[4];
+	struct acpi_vfct_image_hdr image_hdr;
+} __attribute__ ((packed));
+
 typedef struct acpi_ivrs_info {
 } __attribute__ ((packed)) acpi_ivrs_info_t;
 
@@ -601,6 +625,11 @@ void acpi_create_srat(acpi_srat_t *srat,
 void acpi_create_slit(acpi_slit_t *slit,
 		      unsigned long (*acpi_fill_slit)(unsigned long current));
 
+void acpi_create_vfct(struct device *device,
+		      struct acpi_vfct *vfct,
+		      unsigned long (*acpi_fill_vfct)(struct device *device,
+		          struct acpi_vfct *vfct_struct, unsigned long current));
+
 void acpi_create_ivrs(acpi_ivrs_t *ivrs,
 		      unsigned long (*acpi_fill_ivrs)(acpi_ivrs_t* ivrs_struct, unsigned long current));
 
diff --git a/src/device/pci_device.c b/src/device/pci_device.c
index 06294d00c7..b2e3c9ac64 100644
--- a/src/device/pci_device.c
+++ b/src/device/pci_device.c
@@ -735,6 +735,9 @@ struct device_operations default_pci_ops_dev = {
 	.read_resources   = pci_dev_read_resources,
 	.set_resources    = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+	.write_acpi_tables = pci_rom_write_acpi_tables,
+#endif
 	.init             = pci_dev_init,
 	.scan_bus         = 0,
 	.enable           = 0,
diff --git a/src/device/pci_rom.c b/src/device/pci_rom.c
index 8366fea357..20621d36b2 100644
--- a/src/device/pci_rom.c
+++ b/src/device/pci_rom.c
@@ -169,3 +169,68 @@ struct rom_header *pci_rom_load(struct device *dev,
 	pci_ram_image_start += rom_size;
 	return (struct rom_header *) (pci_ram_image_start-rom_size);
 }
+
+/* ACPI */
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+static unsigned long
+pci_rom_acpi_fill_vfct(struct device *device,
+					   struct acpi_vfct *vfct_struct,
+					   unsigned long current)
+{
+	struct acpi_vfct_image_hdr *header = &vfct_struct->image_hdr;
+	struct rom_header *rom;
+
+	vfct_struct->VBIOSImageOffset = (size_t)header - (size_t)vfct_struct;
+
+	rom = pci_rom_probe(device);
+	if (!rom) {
+		printk(BIOS_ERR, "pci_rom_acpi_fill_vfct failed\n");
+		return current;
+	}
+
+	header->DeviceID = device->device;
+	header->VendorID = device->vendor;
+	header->PCIBus = device->bus->secondary;
+	header->PCIFunction = PCI_FUNC(device->path.pci.devfn);
+	header->PCIDevice = PCI_SLOT(device->path.pci.devfn);
+	header->ImageLength = rom->size * 512;
+	memcpy((void *)&header->VbiosContent, rom, header->ImageLength);
+
+	current += header->ImageLength;
+	return current;
+}
+
+unsigned long
+pci_rom_write_acpi_tables(struct device *device,
+						  unsigned long current,
+						  struct acpi_rsdp *rsdp)
+{
+	struct acpi_vfct *vfct;
+	struct rom_header *rom;
+
+	/* Only handle VGA devices */
+	if ((device->class >> 8) != PCI_CLASS_DISPLAY_VGA)
+		return current;
+
+	/* Only handle enabled devices */
+	if (!device->enabled)
+		return current;
+
+	/* Probe for option rom */
+	rom = pci_rom_probe(device);
+	if (!rom)
+		return current;
+
+	/* AMD/ATI uses VFCT */
+	if (device->vendor == PCI_VENDOR_ID_ATI) {
+		current = ALIGN(current, 8);
+		printk(BIOS_DEBUG, "ACPI:   * VFCT at %lx\n", current);
+		vfct = (struct acpi_vfct *)current;
+		acpi_create_vfct(device, vfct, pci_rom_acpi_fill_vfct);
+		current += vfct->header.length;
+		acpi_add_table(rsdp, vfct);
+	}
+
+	return current;
+}
+#endif
diff --git a/src/include/device/pci_rom.h b/src/include/device/pci_rom.h
index 2fb2f7a8d5..3f09778e4b 100644
--- a/src/include/device/pci_rom.h
+++ b/src/include/device/pci_rom.h
@@ -2,6 +2,7 @@
 #define PCI_ROM_H
 #include <endian.h>
 #include <stddef.h>
+#include <arch/acpi.h>
 
 #define PCI_ROM_HDR 0xAA55
 #define PCI_DATA_HDR (uint32_t) ( ('R' << 24) | ('I' << 16) | ('C' << 8) | 'P' )
@@ -35,6 +36,12 @@ struct  pci_data {
 
 struct rom_header *pci_rom_probe(struct device *dev);
 struct rom_header *pci_rom_load(struct device *dev, struct rom_header *rom_header);
+
+unsigned long
+pci_rom_write_acpi_tables(struct device *device,
+						  unsigned long current,
+						  struct acpi_rsdp *rsdp);
+
 u32 map_oprom_vendev(u32 vendev);
 
 #endif