3 files changed, 90 insertions, 0 deletions

diff --git a/src/soc/amd/cezanne/acpi/pci0.asl b/src/soc/amd/cezanne/acpi/pci0.asl
new file mode 100644
index 0000000000..f9c732f9b0
--- /dev/null
+++ b/src/soc/amd/cezanne/acpi/pci0.asl
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+Device(PCI0) {
+	Name(_HID, EISAID("PNP0A08"))	/* PCI Express Root Bridge */
+	Name(_CID, EISAID("PNP0A03"))	/* PCI Root Bridge */
+	External(TOM1, IntObj) 		/* Generated by root_complex.c */
+
+	Method(_BBN, 0, NotSerialized) {
+		Return(Zero) /* Bus number = 0 */
+	}
+
+	Method(_STA, 0, NotSerialized) {
+		Return(0x0B)	/* Status is visible */
+	}
+
+	/* Operating System Capabilities Method */
+	Method(_OSC, 4) {
+		CreateDWordField(Arg3, 0, CDW1) /* Capabilities dword 1 */
+
+		/* Check for proper PCI/PCIe UUID */
+		If (Arg0 == ToUUID("33DB4D5B-1FF7-401C-9657-7441C03DD766")) {
+			/* Let OS control everything */
+			Return (Arg3)
+		} Else {
+			CDW1 |= 4	/* Unrecognized UUID */
+			Return (Arg3)
+		}
+	}
+	Name(CRES, ResourceTemplate() {
+		WordBusNumber (ResourceProducer, MinFixed, MaxFixed, PosDecode,
+			0x0000,		/* address granularity */
+			0x0000,		/* range minimum */
+			0x00ff,		/* range maximum */
+			0x0000,		/* translation */
+			0x0100,		/* length */
+			,, PSB0)	/* ResourceSourceIndex, ResourceSource, DescriptorName */
+
+		IO(Decode16, 0x0cf8, 0x0cf8, 1,	8)
+
+		WORDIO(ResourceProducer, MinFixed, MaxFixed, PosDecode, EntireRange,
+			0x0000,		/* address granularity */
+			0x0000,		/* range minimum */
+			0x0cf7,		/* range maximum */
+			0x0000,		/* translation */
+			0x0cf8		/* length */
+		)
+
+		WORDIO(ResourceProducer, MinFixed, MaxFixed, PosDecode, EntireRange,
+			0x0000,		/* address granularity */
+			0x0d00,		/* range minimum */
+			0xffff,		/* range maximum */
+			0x0000,		/* translation */
+			0xf300		/* length */
+		)
+
+		Memory32Fixed(READONLY, 0x000a0000, 0x00020000, VGAM)	/* VGA memory space */
+		Memory32Fixed(READONLY, 0x000c0000, 0x00020000, EMM1)	/* Assume C0000-E0000 empty */
+
+		/* memory space for PCI BARs below 4GB */
+		Memory32Fixed(ReadOnly, 0x00000000, 0x00000000, MMIO)
+	})
+
+	Method(_CRS, 0) {
+		CreateDWordField(CRES, ^MMIO._BAS, MM1B)
+		CreateDWordField(CRES, ^MMIO._LEN, MM1L)
+
+		/* Declare memory between TOM1 and MMCONF as available for PCI MMIO. */
+		MM1B = TOM1
+		Local0 = CONFIG_MMCONF_BASE_ADDRESS
+		Local0 -= TOM1
+		MM1L = Local0
+
+		CreateWordField(CRES, ^PSB0._MAX, BMAX)
+		CreateWordField(CRES, ^PSB0._LEN, BLEN)
+		BMAX = CONFIG_MMCONF_BUS_NUMBER - 1
+		BLEN = CONFIG_MMCONF_BUS_NUMBER
+
+		Return(CRES) /* note to change the Name buffer */
+	} /* end of Method(_SB.PCI0._CRS) */
+
+} /* End PCI0 scope */
diff --git a/src/soc/amd/cezanne/acpi/soc.asl b/src/soc/amd/cezanne/acpi/soc.asl
index 1a45b0ae8a..c935dc3eea 100644
--- a/src/soc/amd/cezanne/acpi/soc.asl
+++ b/src/soc/amd/cezanne/acpi/soc.asl
@@ -9,6 +9,8 @@ Scope(\_SB) {
 	#include "pci_int_defs.asl"
 
 	#include "mmio.asl"
+
+	#include "pci0.asl"
 } /* End \_SB scope */
 
 #include <soc/amd/common/acpi/platform.asl>
diff --git a/src/soc/amd/cezanne/root_complex.c b/src/soc/amd/cezanne/root_complex.c
index 9191dc2481..ba846810c8 100644
--- a/src/soc/amd/cezanne/root_complex.c
+++ b/src/soc/amd/cezanne/root_complex.c
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <amdblocks/acpi.h>
 #include <amdblocks/memmap.h>
 #include <cbmem.h>
 #include <console/console.h>
@@ -130,6 +131,11 @@ static void read_resources(struct device *dev)
 	}
 }
 
+static void root_complex_fill_ssdt(const struct device *device)
+{
+	acpi_fill_root_complex_tom(device);
+}
+
 static const char *gnb_acpi_name(const struct device *dev)
 {
 	return "GNB";
@@ -140,6 +146,7 @@ static struct device_operations root_complex_operations = {
 	.set_resources		= noop_set_resources,
 	.enable_resources	= pci_dev_enable_resources,
 	.acpi_name		= gnb_acpi_name,
+	.acpi_fill_ssdt		= root_complex_fill_ssdt,
 };
 
 static const struct pci_driver family17_root_complex __pci_driver = {