path: root/resources/libreboot/patch/kgpe-d16/0019-northbridge-amd-amdmct-mct_ddr3-Add-initial-Suspend-.patch

From b1e36a17d254e15459729ebfc3a83df4a2b28468 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <tpearson@raptorengineeringinc.com>
Date: Sat, 5 Sep 2015 18:40:31 -0500
Subject: [PATCH 019/139] northbridge/amd/amdmct/mct_ddr3: Add initial Suspend
 to RAM (S3) support

Change-Id: Ic97567851fa40295bc21cefd7537407b99d71709
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
---
 src/northbridge/amd/amdfam10/northbridge.c    |   8 +
 src/northbridge/amd/amdmct/mct_ddr3/mct_d.c   | 154 ++++---
 src/northbridge/amd/amdmct/mct_ddr3/mct_d.h   | 112 +++++
 src/northbridge/amd/amdmct/mct_ddr3/s3utils.c | 610 ++++++++++++++++++++++++++
 src/northbridge/amd/amdmct/mct_ddr3/s3utils.h |  28 ++
 5 files changed, 840 insertions(+), 72 deletions(-)
 create mode 100644 src/northbridge/amd/amdmct/mct_ddr3/s3utils.c
 create mode 100644 src/northbridge/amd/amdmct/mct_ddr3/s3utils.h

diff --git a/src/northbridge/amd/amdfam10/northbridge.c b/src/northbridge/amd/amdfam10/northbridge.c
index 74cecc8..9cc3d96 100644
--- a/src/northbridge/amd/amdfam10/northbridge.c
+++ b/src/northbridge/amd/amdfam10/northbridge.c
@@ -54,6 +54,10 @@
 #include <sb_cimx.h>
 #endif
 
+#if IS_ENABLED(CONFIG_DIMM_DDR3)
+#include "../amdmct/mct_ddr3/s3utils.h"
+#endif
+
 struct amdfam10_sysconf_t sysconf;
 
 #define FX_DEVS NODE_NUMS
@@ -1413,6 +1417,10 @@ static void root_complex_enable_dev(struct device *dev)
 	/* Do not delay UMA setup, as a device on the PCI bus may evaluate
 	   the global uma_memory variables already in its enable function. */
 	if (!done) {
+#if IS_ENABLED(CONFIG_DIMM_DDR3)
+		save_mct_information_to_nvram();
+#endif
+
 		setup_bsp_ramtop();
 		setup_uma_memory();
 		done = 1;
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
index fa59d71..a8212c5 100644
--- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
+++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
@@ -272,91 +272,101 @@ static void mctAutoInitMCT_D(struct MCTStatStruc *pMCTstat,
 	u8 Node, NodesWmem;
 	u32 node_sys_base;
 
+	uint8_t s3resume = acpi_is_wakeup_s3();
+
 restartinit:
 	mctInitMemGPIOs_A_D();		/* Set any required GPIOs*/
-	NodesWmem = 0;
-	node_sys_base = 0;
-	for (Node = 0; Node < MAX_NODES_SUPPORTED; Node++) {
-		struct DCTStatStruc *pDCTstat;
-		pDCTstat = pDCTstatA + Node;
+	if (s3resume) {
+#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D: Restoring DCT configuration from NVRAM\n");
+		restore_mct_information_from_nvram();
+#endif
+	} else {
+		NodesWmem = 0;
+		node_sys_base = 0;
+		for (Node = 0; Node < MAX_NODES_SUPPORTED; Node++) {
+			struct DCTStatStruc *pDCTstat;
+			pDCTstat = pDCTstatA + Node;
 
-		/* Zero out data structures to avoid false detection of DIMMs */
-		memset(pDCTstat, 0, sizeof(struct DCTStatStruc));
-
-		/* Initialize data structures */
-		pDCTstat->Node_ID = Node;
-		pDCTstat->dev_host = PA_HOST(Node);
-		pDCTstat->dev_map = PA_MAP(Node);
-		pDCTstat->dev_dct = PA_DCT(Node);
-		pDCTstat->dev_nbmisc = PA_NBMISC(Node);
-		pDCTstat->NodeSysBase = node_sys_base;
-
-		printk(BIOS_DEBUG, "mctAutoInitMCT_D: mct_init Node %d\n", Node);
-		mct_init(pMCTstat, pDCTstat);
-		mctNodeIDDebugPort_D();
-		pDCTstat->NodePresent = NodePresent_D(Node);
-		if (pDCTstat->NodePresent) {		/* See if Node is there*/
-			printk(BIOS_DEBUG, "mctAutoInitMCT_D: clear_legacy_Mode\n");
-			clear_legacy_Mode(pMCTstat, pDCTstat);
-			pDCTstat->LogicalCPUID = mctGetLogicalCPUID_D(Node);
-
-			printk(BIOS_DEBUG, "mctAutoInitMCT_D: mct_InitialMCT_D\n");
-			mct_InitialMCT_D(pMCTstat, pDCTstat);
-
-			printk(BIOS_DEBUG, "mctAutoInitMCT_D: mctSMBhub_Init\n");
-			mctSMBhub_Init(Node);		/* Switch SMBUS crossbar to proper node*/
-
-			printk(BIOS_DEBUG, "mctAutoInitMCT_D: mct_initDCT\n");
-			mct_initDCT(pMCTstat, pDCTstat);
-			if (pDCTstat->ErrCode == SC_FatalErr) {
-				goto fatalexit;		/* any fatal errors?*/
-			} else if (pDCTstat->ErrCode < SC_StopError) {
-				NodesWmem++;
-			}
-		}	/* if Node present */
-		node_sys_base = pDCTstat->NodeSysBase;
-		node_sys_base += (pDCTstat->NodeSysLimit + 2) & ~0x0F;
-	}
-	if (NodesWmem == 0) {
-		printk(BIOS_DEBUG, "No Nodes?!\n");
-		goto fatalexit;
-	}
+			/* Zero out data structures to avoid false detection of DIMMs */
+			memset(pDCTstat, 0, sizeof(struct DCTStatStruc));
+
+			/* Initialize data structures */
+			pDCTstat->Node_ID = Node;
+			pDCTstat->dev_host = PA_HOST(Node);
+			pDCTstat->dev_map = PA_MAP(Node);
+			pDCTstat->dev_dct = PA_DCT(Node);
+			pDCTstat->dev_nbmisc = PA_NBMISC(Node);
+			pDCTstat->NodeSysBase = node_sys_base;
+
+			printk(BIOS_DEBUG, "mctAutoInitMCT_D: mct_init Node %d\n", Node);
+			mct_init(pMCTstat, pDCTstat);
+			mctNodeIDDebugPort_D();
+			pDCTstat->NodePresent = NodePresent_D(Node);
+			if (pDCTstat->NodePresent) {		/* See if Node is there*/
+				printk(BIOS_DEBUG, "mctAutoInitMCT_D: clear_legacy_Mode\n");
+				clear_legacy_Mode(pMCTstat, pDCTstat);
+				pDCTstat->LogicalCPUID = mctGetLogicalCPUID_D(Node);
+
+				printk(BIOS_DEBUG, "mctAutoInitMCT_D: mct_InitialMCT_D\n");
+				mct_InitialMCT_D(pMCTstat, pDCTstat);
+
+				printk(BIOS_DEBUG, "mctAutoInitMCT_D: mctSMBhub_Init\n");
+				mctSMBhub_Init(Node);		/* Switch SMBUS crossbar to proper node*/
+
+				printk(BIOS_DEBUG, "mctAutoInitMCT_D: mct_initDCT\n");
+				mct_initDCT(pMCTstat, pDCTstat);
+				if (pDCTstat->ErrCode == SC_FatalErr) {
+					goto fatalexit;		/* any fatal errors?*/
+				} else if (pDCTstat->ErrCode < SC_StopError) {
+					NodesWmem++;
+				}
+			}	/* if Node present */
+			node_sys_base = pDCTstat->NodeSysBase;
+			node_sys_base += (pDCTstat->NodeSysLimit + 2) & ~0x0F;
+		}
+		if (NodesWmem == 0) {
+			printk(BIOS_DEBUG, "No Nodes?!\n");
+			goto fatalexit;
+		}
 
-	printk(BIOS_DEBUG, "mctAutoInitMCT_D: SyncDCTsReady_D\n");
-	SyncDCTsReady_D(pMCTstat, pDCTstatA);	/* Make sure DCTs are ready for accesses.*/
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D: SyncDCTsReady_D\n");
+		SyncDCTsReady_D(pMCTstat, pDCTstatA);	/* Make sure DCTs are ready for accesses.*/
 
-	printk(BIOS_DEBUG, "mctAutoInitMCT_D: HTMemMapInit_D\n");
-	HTMemMapInit_D(pMCTstat, pDCTstatA);	/* Map local memory into system address space.*/
-	mctHookAfterHTMap();
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D: HTMemMapInit_D\n");
+		HTMemMapInit_D(pMCTstat, pDCTstatA);	/* Map local memory into system address space.*/
+		mctHookAfterHTMap();
 
-	printk(BIOS_DEBUG, "mctAutoInitMCT_D: CPUMemTyping_D\n");
-	CPUMemTyping_D(pMCTstat, pDCTstatA);	/* Map dram into WB/UC CPU cacheability */
-	mctHookAfterCPU();			/* Setup external northbridge(s) */
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D: CPUMemTyping_D\n");
+		CPUMemTyping_D(pMCTstat, pDCTstatA);	/* Map dram into WB/UC CPU cacheability */
+		mctHookAfterCPU();			/* Setup external northbridge(s) */
 
-	printk(BIOS_DEBUG, "mctAutoInitMCT_D: DQSTiming_D\n");
-	DQSTiming_D(pMCTstat, pDCTstatA);	/* Get Receiver Enable and DQS signal timing*/
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D: DQSTiming_D\n");
+		DQSTiming_D(pMCTstat, pDCTstatA);	/* Get Receiver Enable and DQS signal timing*/
 
-	printk(BIOS_DEBUG, "mctAutoInitMCT_D: UMAMemTyping_D\n");
-	UMAMemTyping_D(pMCTstat, pDCTstatA);	/* Fix up for UMA sizing */
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D: UMAMemTyping_D\n");
+		UMAMemTyping_D(pMCTstat, pDCTstatA);	/* Fix up for UMA sizing */
 
-	printk(BIOS_DEBUG, "mctAutoInitMCT_D: :OtherTiming\n");
-	mct_OtherTiming(pMCTstat, pDCTstatA);
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D: :OtherTiming\n");
+		mct_OtherTiming(pMCTstat, pDCTstatA);
 
-	if (ReconfigureDIMMspare_D(pMCTstat, pDCTstatA)) { /* RESET# if 1st pass of DIMM spare enabled*/
-		goto restartinit;
-	}
 
-	InterleaveNodes_D(pMCTstat, pDCTstatA);
-	InterleaveChannels_D(pMCTstat, pDCTstatA);
+		if (ReconfigureDIMMspare_D(pMCTstat, pDCTstatA)) { /* RESET# if 1st pass of DIMM spare enabled*/
+			goto restartinit;
+		}
 
-	printk(BIOS_DEBUG, "mctAutoInitMCT_D: ECCInit_D\n");
-	if (ECCInit_D(pMCTstat, pDCTstatA)) {		/* Setup ECC control and ECC check-bits*/
-		printk(BIOS_DEBUG, "mctAutoInitMCT_D: MCTMemClr_D\n");
-		MCTMemClr_D(pMCTstat,pDCTstatA);
-	}
+		InterleaveNodes_D(pMCTstat, pDCTstatA);
+		InterleaveChannels_D(pMCTstat, pDCTstatA);
+
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D: ECCInit_D\n");
+		if (ECCInit_D(pMCTstat, pDCTstatA)) {		/* Setup ECC control and ECC check-bits*/
+			printk(BIOS_DEBUG, "mctAutoInitMCT_D: MCTMemClr_D\n");
+			MCTMemClr_D(pMCTstat,pDCTstatA);
+		}
 
-	mct_FinalMCT_D(pMCTstat, pDCTstatA);
-	printk(BIOS_DEBUG, "mctAutoInitMCT_D Done: Global Status: %x\n", pMCTstat->GStatus);
+		mct_FinalMCT_D(pMCTstat, pDCTstatA);
+		printk(BIOS_DEBUG, "mctAutoInitMCT_D Done: Global Status: %x\n", pMCTstat->GStatus);
+	}
 
 	return;
 
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.h b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.h
index 219aa42..c790d7e 100644
--- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.h
+++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.h
@@ -24,6 +24,8 @@
 #ifndef MCT_D_H
 #define MCT_D_H
 
+#include <cpu/x86/msr.h>
+
 /*===========================================================================
 	CPU - K8/FAM10
 ===========================================================================*/
@@ -596,6 +598,116 @@ struct DCTStatStruc {		/* A per Node structure*/
 	uint32_t DimmSerialNumber[MAX_DIMMS_SUPPORTED];
 } __attribute__((packed));
 
+struct amd_s3_persistent_mct_channel_data {
+	/* Stage 1 (1 dword) */
+	uint32_t f2x110;
+
+	/* Stage 2 (88 dwords) */
+	uint32_t f1x40;
+	uint32_t f1x44;
+	uint32_t f1x48;
+	uint32_t f1x4c;
+	uint32_t f1x50;
+	uint32_t f1x54;
+	uint32_t f1x58;
+	uint32_t f1x5c;
+	uint32_t f1x60;
+	uint32_t f1x64;
+	uint32_t f1x68;
+	uint32_t f1x6c;
+	uint32_t f1x70;
+	uint32_t f1x74;
+	uint32_t f1x78;
+	uint32_t f1x7c;
+	uint32_t f1xf0;
+	uint32_t f1x120;
+	uint32_t f1x124;
+	uint32_t f2x10c;
+	uint32_t f2x114;
+	uint32_t f2x118;
+	uint32_t f2x11c;
+	uint32_t f2x1b0;
+	uint32_t f3x44;
+	uint64_t msr0000020[16];
+	uint64_t msr00000250;
+	uint64_t msr00000258;
+	uint64_t msr0000026[8];
+	uint64_t msr000002ff;
+	uint64_t msrc0010010;
+	uint64_t msrc001001a;
+	uint64_t msrc001001d;
+	uint64_t msrc001001f;
+
+	/* Stage 3 (21 dwords) */
+	uint32_t f2x40;
+	uint32_t f2x44;
+	uint32_t f2x48;
+	uint32_t f2x4c;
+	uint32_t f2x50;
+	uint32_t f2x54;
+	uint32_t f2x58;
+	uint32_t f2x5c;
+	uint32_t f2x60;
+	uint32_t f2x64;
+	uint32_t f2x68;
+	uint32_t f2x6c;
+	uint32_t f2x78;
+	uint32_t f2x7c;
+	uint32_t f2x80;
+	uint32_t f2x84;
+	uint32_t f2x88;
+	uint32_t f2x8c;
+	uint32_t f2x90;
+	uint32_t f2xa4;
+	uint32_t f2xa8;
+
+	/* Stage 4 (1 dword) */
+	uint32_t f2x94;
+
+	/* Stage 6 (33 dwords) */
+	uint32_t f2x9cx0d0f0_f_8_0_0_8_4_0[9][3];	/* [lane][setting] */
+	uint32_t f2x9cx00;
+	uint32_t f2x9cx0a;
+	uint32_t f2x9cx0c;
+
+	/* Stage 7 (1 dword) */
+	uint32_t f2x9cx04;
+
+	/* Stage 9 (2 dwords) */
+	uint32_t f2x9cx0d0fe006;
+	uint32_t f2x9cx0d0fe007;
+
+	/* Stage 10 (78 dwords) */
+	uint32_t f2x9cx10[12];
+	uint32_t f2x9cx20[12];
+	uint32_t f2x9cx3_0_0_3_1[4][3];		/* [dimm][setting] */
+	uint32_t f2x9cx3_0_0_7_5[4][3];		/* [dimm][setting] */
+	uint32_t f2x9cx0d;
+	uint32_t f2x9cx0d0f0_f_0_13[9];		/* [lane] */
+	uint32_t f2x9cx0d0f0_f_0_30[9];		/* [lane] */
+	uint32_t f2x9cx0d0f2_f_0_30[4];		/* [pad select] */
+	uint32_t f2x9cx0d0f8_8_4_0[2][3];	/* [offset][pad select] */
+	uint32_t f2x9cx0d0f812f;
+
+	/* Stage 11 (24 dwords) */
+	uint32_t f2x9cx30[12];
+	uint32_t f2x9cx40[12];
+
+	/* Other (1 dword) */
+	uint32_t f3x58;
+
+	/* TOTAL: 250 dwords */
+} __attribute__((packed));
+
+struct amd_s3_persistent_node_data {
+	uint32_t node_present;
+	struct amd_s3_persistent_mct_channel_data channel[2];
+} __attribute__((packed));
+
+struct amd_s3_persistent_data {
+	struct amd_s3_persistent_node_data node[MAX_NODES_SUPPORTED];
+} __attribute__((packed));
+
 /*===============================================================================
 	Local Error Status Codes (DCTStatStruc.ErrCode)
 ===============================================================================*/
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c b/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c
new file mode 100644
index 0000000..78523e8
--- /dev/null
+++ b/src/northbridge/amd/amdmct/mct_ddr3/s3utils.c
@@ -0,0 +1,610 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,  MA 02110-1301 USA
+ */
+
+#include <string.h>
+#include <arch/acpi.h>
+#include <cpu/x86/msr.h>
+#include <device/device.h>
+#include <device/pci_def.h>
+#include <device/pci_ops.h>
+#include <console/console.h>
+#include <cbfs.h>
+#include <spi-generic.h>
+#include <spi_flash.h>
+
+#include "s3utils.h"
+
+#define S3NV_FILE_NAME "s3nv"
+
+static ssize_t get_s3nv_file_offset(void);
+
+ssize_t get_s3nv_file_offset(void)
+{
+	struct region_device s3nv_region;
+	struct cbfsf s3nv_cbfs_file;
+	if (cbfs_boot_locate(&s3nv_cbfs_file, S3NV_FILE_NAME, NULL)) {
+		printk(BIOS_DEBUG, "S3 state file not found in CBFS: %s\n", S3NV_FILE_NAME);
+		return -1;
+	}
+	cbfs_file_data(&s3nv_region, &s3nv_cbfs_file);
+
+	return s3nv_region.region.offset;
+}
+
+static uint32_t read_amd_dct_index_register(device_t dev, uint32_t index_ctl_reg, uint32_t index)
+{
+	uint32_t dword;
+
+	index &= ~(1 << 30);
+	pci_write_config32(dev, index_ctl_reg, index);
+	do {
+		dword = pci_read_config32(dev, index_ctl_reg);
+	} while (!(dword & (1 << 31)));
+	dword = pci_read_config32(dev, index_ctl_reg + 0x04);
+
+	return dword;
+}
+
+#ifdef __RAMSTAGE__
+static uint64_t rdmsr_uint64_t(unsigned long index) {
+	msr_t msr = rdmsr(index);
+	return (((uint64_t)msr.hi) << 32) | ((uint64_t)msr.lo);
+}
+
+void copy_mct_data_to_save_variable(struct amd_s3_persistent_data* persistent_data)
+{
+	uint8_t i;
+	uint8_t j;
+	uint8_t node;
+	uint8_t channel;
+
+	/* Zero out data structure */
+	memset(persistent_data, 0, sizeof(struct amd_s3_persistent_data));
+
+	/* Load data from DCTs into data structure */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		device_t dev_fn1 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 1));
+		device_t dev_fn2 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 2));
+		device_t dev_fn3 = dev_find_slot(0, PCI_DEVFN(0x18 + node, 3));
+		if ((!dev_fn1) || (!dev_fn2) || (!dev_fn3)) {
+			persistent_data->node[node].node_present = 0;
+			continue;
+		}
+		persistent_data->node[node].node_present = 1;
+
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+
+			/* Stage 1 */
+			data->f2x110 = pci_read_config32(dev_fn2, 0x110);
+
+			/* Stage 2 */
+			data->f1x40 = pci_read_config32(dev_fn1, 0x40 + (0x100 * channel));
+			data->f1x44 = pci_read_config32(dev_fn1, 0x44 + (0x100 * channel));
+			data->f1x48 = pci_read_config32(dev_fn1, 0x48 + (0x100 * channel));
+			data->f1x4c = pci_read_config32(dev_fn1, 0x4c + (0x100 * channel));
+			data->f1x50 = pci_read_config32(dev_fn1, 0x50 + (0x100 * channel));
+			data->f1x54 = pci_read_config32(dev_fn1, 0x54 + (0x100 * channel));
+			data->f1x58 = pci_read_config32(dev_fn1, 0x58 + (0x100 * channel));
+			data->f1x5c = pci_read_config32(dev_fn1, 0x5c + (0x100 * channel));
+			data->f1x60 = pci_read_config32(dev_fn1, 0x60 + (0x100 * channel));
+			data->f1x64 = pci_read_config32(dev_fn1, 0x64 + (0x100 * channel));
+			data->f1x68 = pci_read_config32(dev_fn1, 0x68 + (0x100 * channel));
+			data->f1x6c = pci_read_config32(dev_fn1, 0x6c + (0x100 * channel));
+			data->f1x70 = pci_read_config32(dev_fn1, 0x70 + (0x100 * channel));
+			data->f1x74 = pci_read_config32(dev_fn1, 0x74 + (0x100 * channel));
+			data->f1x78 = pci_read_config32(dev_fn1, 0x78 + (0x100 * channel));
+			data->f1x7c = pci_read_config32(dev_fn1, 0x7c + (0x100 * channel));
+			data->f1xf0 = pci_read_config32(dev_fn1, 0xf0);
+			data->f1x120 = pci_read_config32(dev_fn1, 0x120);
+			data->f1x124 = pci_read_config32(dev_fn1, 0x124);
+			data->f2x10c = pci_read_config32(dev_fn2, 0x10c);
+			data->f2x114 = pci_read_config32(dev_fn2, 0x114);
+			data->f2x118 = pci_read_config32(dev_fn2, 0x118);
+			data->f2x11c = pci_read_config32(dev_fn2, 0x11c);
+			data->f2x1b0 = pci_read_config32(dev_fn2, 0x1b0);
+			data->f3x44 = pci_read_config32(dev_fn3, 0x44);
+			for (i=0; i<16; i++) {
+				data->msr0000020[i] = rdmsr_uint64_t(0x00000200 | i);
+			}
+			data->msr00000250 = rdmsr_uint64_t(0x00000250);
+			data->msr00000258 = rdmsr_uint64_t(0x00000258);
+			for (i=0; i<8; i++)
+				data->msr0000026[i] = rdmsr_uint64_t(0x00000260 | (i + 8));
+			data->msr000002ff = rdmsr_uint64_t(0x000002ff);
+			data->msrc0010010 = rdmsr_uint64_t(0xc0010010);
+			data->msrc001001a = rdmsr_uint64_t(0xc001001a);
+			data->msrc001001d = rdmsr_uint64_t(0xc001001d);
+			data->msrc001001f = rdmsr_uint64_t(0xc001001f);
+
+			/* Stage 3 */
+			data->f2x40 = pci_read_config32(dev_fn2, 0x40 + (0x100 * channel));
+			data->f2x44 = pci_read_config32(dev_fn2, 0x44 + (0x100 * channel));
+			data->f2x48 = pci_read_config32(dev_fn2, 0x48 + (0x100 * channel));
+			data->f2x4c = pci_read_config32(dev_fn2, 0x4c + (0x100 * channel));
+			data->f2x50 = pci_read_config32(dev_fn2, 0x50 + (0x100 * channel));
+			data->f2x54 = pci_read_config32(dev_fn2, 0x54 + (0x100 * channel));
+			data->f2x58 = pci_read_config32(dev_fn2, 0x58 + (0x100 * channel));
+			data->f2x5c = pci_read_config32(dev_fn2, 0x5c + (0x100 * channel));
+			data->f2x60 = pci_read_config32(dev_fn2, 0x60 + (0x100 * channel));
+			data->f2x64 = pci_read_config32(dev_fn2, 0x64 + (0x100 * channel));
+			data->f2x68 = pci_read_config32(dev_fn2, 0x68 + (0x100 * channel));
+			data->f2x6c = pci_read_config32(dev_fn2, 0x6c + (0x100 * channel));
+			data->f2x78 = pci_read_config32(dev_fn2, 0x78 + (0x100 * channel));
+			data->f2x7c = pci_read_config32(dev_fn2, 0x7c + (0x100 * channel));
+			data->f2x80 = pci_read_config32(dev_fn2, 0x80 + (0x100 * channel));
+			data->f2x84 = pci_read_config32(dev_fn2, 0x84 + (0x100 * channel));
+			data->f2x88 = pci_read_config32(dev_fn2, 0x88 + (0x100 * channel));
+			data->f2x8c = pci_read_config32(dev_fn2, 0x8c + (0x100 * channel));
+			data->f2x90 = pci_read_config32(dev_fn2, 0x90 + (0x100 * channel));
+			data->f2xa4 = pci_read_config32(dev_fn2, 0xa4 + (0x100 * channel));
+			data->f2xa8 = pci_read_config32(dev_fn2, 0xa8 + (0x100 * channel));
+
+			/* Stage 4 */
+			data->f2x94 = pci_read_config32(dev_fn2, 0x94 + (0x100 * channel));
+
+			/* Stage 6 */
+			for (i=0; i<9; i++)
+				for (j=0; j<3; j++)
+					data->f2x9cx0d0f0_f_8_0_0_8_4_0[i][j] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d0f0000 | (i << 8) | (j * 4));
+			data->f2x9cx00 = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x00);
+			data->f2x9cx0a = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0a);
+			data->f2x9cx0c = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0c);
+
+			/* Stage 7 */
+			data->f2x9cx04 = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x04);
+
+			/* Stage 9 */
+			data->f2x9cx0d0fe006 = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d0fe006);
+			data->f2x9cx0d0fe007 = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d0fe007);
+
+			/* Stage 10 */
+			for (i=0; i<12; i++)
+				data->f2x9cx10[i] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x10 + i);
+			for (i=0; i<12; i++)
+				data->f2x9cx20[i] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x20 + i);
+			for (i=0; i<4; i++)
+				for (j=0; j<3; j++)
+					data->f2x9cx3_0_0_3_1[i][j] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), (0x01 + i) + (0x100 * j));
+			for (i=0; i<4; i++)
+				for (j=0; j<3; j++)
+					data->f2x9cx3_0_0_7_5[i][j] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), (0x05 + i) + (0x100 * j));
+			data->f2x9cx0d = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d);
+			for (i=0; i<9; i++)
+				data->f2x9cx0d0f0_f_0_13[i] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d0f0013 | (i << 8));
+			for (i=0; i<9; i++)
+				data->f2x9cx0d0f0_f_0_30[i] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d0f0030 | (i << 8));
+			for (i=0; i<4; i++)
+				data->f2x9cx0d0f2_f_0_30[i] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d0f2030 | (i << 8));
+			for (i=0; i<2; i++)
+				for (j=0; j<3; j++)
+					data->f2x9cx0d0f8_8_4_0[i][j] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d0f0000 | (i << 8) | (j * 4));
+			data->f2x9cx0d0f812f = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x0d0f812f);
+
+			/* Stage 11 */
+			if (IS_ENABLED(CONFIG_DIMM_DDR3)) {
+				for (i=0; i<12; i++)
+					data->f2x9cx30[i] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x30 + i);
+				for (i=0; i<12; i++)
+					data->f2x9cx40[i] = read_amd_dct_index_register(dev_fn2, 0x98 + (0x100 * channel), 0x40 + i);
+			}
+
+			/* Other */
+			/* ECC scrub rate control */
+			data->f3x58 = pci_read_config32(dev_fn3, 0x58);
+		}
+	}
+}
+#else
+static void write_amd_dct_index_register(device_t dev, uint32_t index_ctl_reg, uint32_t index, uint32_t value)
+{
+	uint32_t dword;
+
+	pci_write_config32(dev, index_ctl_reg + 0x04, value);
+	index |= (1 << 30);
+	pci_write_config32(dev, index_ctl_reg, index);
+	do {
+		dword = pci_read_config32(dev, index_ctl_reg);
+	} while (!(dword & (1 << 31)));
+}
+#endif
+
+#ifdef __PRE_RAM__
+static void wrmsr_uint64_t(unsigned long index, uint64_t value) {
+	msr_t msr;
+	msr.hi = (value & 0xffffffff00000000ULL) >> 32;
+	msr.lo = (value & 0xffffffff);
+	wrmsr(index, msr);
+}
+
+void restore_mct_data_from_save_variable(struct amd_s3_persistent_data* persistent_data)
+{
+	uint8_t i;
+	uint8_t j;
+	uint8_t node;
+	uint8_t channel;
+	uint8_t ganged;
+	uint8_t dct_enabled;
+	uint32_t dword;
+
+	/* Load data from data structure into DCTs */
+	/* Stage 1 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x110, data->f2x110);
+		}
+	}
+
+	/* Stage 2 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x40 + (0x100 * channel), data->f1x40);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x44 + (0x100 * channel), data->f1x44);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x48 + (0x100 * channel), data->f1x48);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x4c + (0x100 * channel), data->f1x4c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x50 + (0x100 * channel), data->f1x50);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x54 + (0x100 * channel), data->f1x54);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x58 + (0x100 * channel), data->f1x58);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x5c + (0x100 * channel), data->f1x5c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x60 + (0x100 * channel), data->f1x60);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x64 + (0x100 * channel), data->f1x64);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x68 + (0x100 * channel), data->f1x68);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x6c + (0x100 * channel), data->f1x6c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x70 + (0x100 * channel), data->f1x70);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x74 + (0x100 * channel), data->f1x74);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x78 + (0x100 * channel), data->f1x78);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x7c + (0x100 * channel), data->f1x7c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0xf0 + (0x100 * channel), data->f1xf0);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x120 + (0x100 * channel), data->f1x120);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 1), 0x124 + (0x100 * channel), data->f1x124);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x10c + (0x100 * channel), data->f2x10c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x114 + (0x100 * channel), data->f2x114);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x118 + (0x100 * channel), data->f2x118);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x11c + (0x100 * channel), data->f2x11c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x1b0 + (0x100 * channel), data->f2x1b0);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 3), 0x44 + (0x100 * channel), data->f3x44);
+			for (i=0; i<16; i++) {
+				wrmsr_uint64_t(0x00000200 | i, data->msr0000020[i]);
+			}
+			wrmsr_uint64_t(0x00000250, data->msr00000250);
+			wrmsr_uint64_t(0x00000258, data->msr00000258);
+			/* FIXME
+			 * Restoring these MSRs causes a hang on resume
+			 * For now, skip restoration...
+			 */
+			// for (i=0; i<8; i++)
+			// 	wrmsr_uint64_t(0x00000260 | (i + 8), data->msr0000026[i]);
+			wrmsr_uint64_t(0x000002ff, data->msr000002ff);
+			wrmsr_uint64_t(0xc0010010, data->msrc0010010);
+			wrmsr_uint64_t(0xc001001a, data->msrc001001a);
+			wrmsr_uint64_t(0xc001001d, data->msrc001001d);
+			wrmsr_uint64_t(0xc001001f, data->msrc001001f);
+		}
+	}
+
+	/* Stage 3 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			ganged = !!(data->f2x110 & 0x10);
+			if ((ganged == 1) && (channel > 0))
+				continue;
+
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x40 + (0x100 * channel), data->f2x40);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x44 + (0x100 * channel), data->f2x44);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x48 + (0x100 * channel), data->f2x48);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x4c + (0x100 * channel), data->f2x4c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x50 + (0x100 * channel), data->f2x50);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x54 + (0x100 * channel), data->f2x54);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x58 + (0x100 * channel), data->f2x58);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x5c + (0x100 * channel), data->f2x5c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x60 + (0x100 * channel), data->f2x60);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x64 + (0x100 * channel), data->f2x64);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x68 + (0x100 * channel), data->f2x68);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x6c + (0x100 * channel), data->f2x6c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x78 + (0x100 * channel), data->f2x78);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x7c + (0x100 * channel), data->f2x7c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x80 + (0x100 * channel), data->f2x80);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x84 + (0x100 * channel), data->f2x84);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x88 + (0x100 * channel), data->f2x88);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x8c + (0x100 * channel), data->f2x8c);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x90 + (0x100 * channel), data->f2x90);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0xa4 + (0x100 * channel), data->f2xa4);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0xa8 + (0x100 * channel), data->f2xa8);
+		}
+	}
+
+	/* Stage 4 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			ganged = !!(data->f2x110 & 0x10);
+			if ((ganged == 1) && (channel > 0))
+				continue;
+
+			/* Disable PHY auto-compensation engine */
+			dword = read_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x08);
+			if (!(dword & (1 << 30))) {
+				dword |= (1 << 30);
+				write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x08, dword);
+
+				/* Wait for 5us */
+				mct_Wait(100);
+			}
+
+			/* Restore DRAM Configuration High Register */
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x94 + (0x100 * channel), data->f2x94);
+
+			/* Enable PHY auto-compensation engine */
+			dword = read_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x08);
+			dword &= ~(1 << 30);
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x08, dword);
+		}
+	}
+
+	/* Wait for 750us */
+	mct_Wait(15000);
+
+	/* Stage 5 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			ganged = !!(data->f2x110 & 0x10);
+			if ((ganged == 1) && (channel > 0))
+				continue;
+
+			/* Wait for any pending PHY frequency changes to complete */
+			do {
+				dword = read_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x08);
+			} while (dword & (1 << 21));
+		}
+	}
+
+	/* Stage 6 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			for (i=0; i<9; i++)
+				for (j=0; j<3; j++)
+					write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d0f0000 | (i << 8) | (j * 4), data->f2x9cx0d0f0_f_8_0_0_8_4_0[i][j]);
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x00, data->f2x9cx00);
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0a, data->f2x9cx0a);
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0c, data->f2x9cx0c);
+		}
+	}
+
+	/* Stage 7 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			ganged = !!(data->f2x110 & 0x10);
+			if ((ganged == 1) && (channel > 0))
+				continue;
+
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x04, data->f2x9cx04);
+		}
+	}
+
+	/* Stage 8 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			dct_enabled = !(data->f2x94 & (1 << 14));
+			if (!dct_enabled)
+				continue;
+
+			ganged = !!(data->f2x110 & 0x10);
+			if ((ganged == 1) && (channel > 0))
+				continue;
+
+			printk(BIOS_SPEW, "Taking DIMMs out of self refresh node: %d channel: %d\n", node, channel);
+
+			/* Exit self refresh mode */
+			dword = pci_read_config32(PCI_DEV(0, 0x18 + node, 2), 0x90 + (0x100 * channel));
+			dword |= (1 << 1);
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 2), 0x90 + (0x100 * channel), dword);
+		}
+	}
+
+	/* Stage 9 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			dct_enabled = !(data->f2x94 & (1 << 14));
+			if (!dct_enabled)
+				continue;
+
+			printk(BIOS_SPEW, "Waiting for DIMMs to exit self refresh node: %d channel: %d\n", node, channel);
+
+			/* Wait for transition from self refresh mode to complete */
+			do {
+				dword = pci_read_config32(PCI_DEV(0, 0x18 + node, 2), 0x90 + (0x100 * channel));
+			} while (dword & (1 << 1));
+
+			/* Restore registers */
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d0fe006, data->f2x9cx0d0fe006);
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d0fe007, data->f2x9cx0d0fe007);
+		}
+	}
+
+	/* Stage 10 */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			for (i=0; i<12; i++)
+				write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x10 + i, data->f2x9cx10[i]);
+			for (i=0; i<12; i++)
+				write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x20 + i, data->f2x9cx20[i]);
+			for (i=0; i<4; i++)
+				for (j=0; j<3; j++)
+					write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), (0x01 + i) + (0x100 * j), data->f2x9cx3_0_0_3_1[i][j]);
+			for (i=0; i<4; i++)
+				for (j=0; j<3; j++)
+					write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), (0x05 + i) + (0x100 * j), data->f2x9cx3_0_0_7_5[i][j]);
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d, data->f2x9cx0d);
+			for (i=0; i<9; i++)
+				write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d0f0013 | (i << 8), data->f2x9cx0d0f0_f_0_13[i]);
+			for (i=0; i<9; i++)
+				write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d0f0030 | (i << 8), data->f2x9cx0d0f0_f_0_30[i]);
+			for (i=0; i<4; i++)
+				write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d0f2030 | (i << 8), data->f2x9cx0d0f2_f_0_30[i]);
+			for (i=0; i<2; i++)
+				for (j=0; j<3; j++)
+					write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d0f0000 | (i << 8) | (j * 4), data->f2x9cx0d0f8_8_4_0[i][j]);
+			write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x0d0f812f, data->f2x9cx0d0f812f);
+		}
+	}
+
+	/* Stage 11 */
+	if (IS_ENABLED(CONFIG_DIMM_DDR3)) {
+		for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+			for (channel = 0; channel < 2; channel++) {
+				struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+				if (!persistent_data->node[node].node_present)
+					continue;
+
+				for (i=0; i<12; i++)
+					write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x30 + i, data->f2x9cx30[i]);
+				for (i=0; i<12; i++)
+					write_amd_dct_index_register(PCI_DEV(0, 0x18 + node, 2), 0x98 + (0x100 * channel), 0x40 + i, data->f2x9cx40[i]);
+			}
+		}
+	}
+
+	/* Other */
+	for (node = 0; node < MAX_NODES_SUPPORTED; node++) {
+		for (channel = 0; channel < 2; channel++) {
+			struct amd_s3_persistent_mct_channel_data* data = &persistent_data->node[node].channel[channel];
+			if (!persistent_data->node[node].node_present)
+				continue;
+
+			/* ECC scrub rate control */
+			pci_write_config32(PCI_DEV(0, 0x18 + node, 3), 0x58, data->f3x58);
+		}
+	}
+}
+#endif
+
+#ifdef __RAMSTAGE__
+int8_t save_mct_information_to_nvram(void)
+{
+	if (acpi_is_wakeup_s3())
+		return 0;
+
+	printk(BIOS_DEBUG, "Writing AMD DCT configuration to Flash\n");
+
+	struct spi_flash *flash;
+	ssize_t s3nv_offset;
+	struct amd_s3_persistent_data persistent_data;
+
+	/* Obtain MCT configuration data */
+	copy_mct_data_to_save_variable(&persistent_data);
+
+	/* Obtain CBFS file offset */
+	s3nv_offset = get_s3nv_file_offset();
+	if (s3nv_offset == -1)
+		return -1;
+
+	/* Align flash pointer to nearest boundary */
+	s3nv_offset &= ~(CONFIG_S3_DATA_SIZE-1);
+	s3nv_offset += CONFIG_S3_DATA_SIZE;
+
+	/* Set temporary SPI MMIO address */
+	device_t lpc_dev = dev_find_slot(0, PCI_DEVFN(0x14, 3));
+	uint32_t spi_mmio_prev = pci_read_config32(lpc_dev, 0xa0);
+	pci_write_config32(lpc_dev, 0xa0, (spi_mmio_prev & 0x1f) | 0xf0000000);
+
+	/* Initialize SPI and detect devices */
+	spi_init();
+	flash = spi_flash_probe(0, 0);
+	if (!flash) {
+		printk(BIOS_DEBUG, "Could not find SPI device\n");
+		return -1;
+	}
+
+	/* Set up SPI flash access */
+	flash->spi->rw = SPI_WRITE_FLAG;
+	spi_claim_bus(flash->spi);
+
+	/* Erase and write data structure */
+	flash->erase(flash, s3nv_offset, CONFIG_S3_DATA_SIZE);
+	flash->write(flash, s3nv_offset, sizeof(struct amd_s3_persistent_data), &persistent_data);
+
+	/* Tear down SPI flash access */
+	flash->spi->rw = SPI_WRITE_FLAG;
+	spi_release_bus(flash->spi);
+
+	/* Restore SPI MMIO address */
+	pci_write_config32(lpc_dev, 0xa0, spi_mmio_prev);
+
+	return 0;
+}
+#endif
+
+int8_t restore_mct_information_from_nvram(void)
+{
+	ssize_t s3nv_offset;
+	struct amd_s3_persistent_data persistent_data;
+
+	/* Obtain CBFS file offset */
+	s3nv_offset = get_s3nv_file_offset();
+	if (s3nv_offset == -1)
+		return -1;
+
+	/* Align flash pointer to nearest boundary */
+	s3nv_offset &= ~(CONFIG_S3_DATA_SIZE-1);
+	s3nv_offset += CONFIG_S3_DATA_SIZE;
+
+	cbfs_read(CBFS_DEFAULT_MEDIA, &persistent_data, s3nv_offset, sizeof(struct amd_s3_persistent_data));
+	restore_mct_data_from_save_variable(&persistent_data);
+
+	return 0;
+}
\ No newline at end of file
diff --git a/src/northbridge/amd/amdmct/mct_ddr3/s3utils.h b/src/northbridge/amd/amdmct/mct_ddr3/s3utils.h
new file mode 100644
index 0000000..dcddcad
--- /dev/null
+++ b/src/northbridge/amd/amdmct/mct_ddr3/s3utils.h
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,  MA 02110-1301 USA
+ */
+
+#include "../wrappers/mcti.h"
+#include "mct_d.h"
+
+#ifdef __RAMSTAGE__
+int8_t save_mct_information_to_nvram(void);
+#endif
+int8_t restore_mct_information_from_nvram(void);
+void copy_mct_data_to_save_variable(struct amd_s3_persistent_data* persistent_data);
+void restore_mct_data_from_save_variable(struct amd_s3_persistent_data* persistent_data);
\ No newline at end of file
-- 
1.9.1