soc/intel/apollolake: Add handling of GNVS ACPI entry for CHROMEOS builds

Add chromeos required GNVS feature. The GNVS table stays in both CBMEM
and ACPI DSDT tables.

Change-Id: I4db0eb18d2de62917a94704318a7896c04e4777f
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/14471
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/acpi.c

@@ -16,12 +16,15 @@
  */
 
 #include <arch/acpi.h>
+#include <arch/acpigen.h>
 #include <arch/ioapic.h>
 #include <arch/smp/mpspec.h>
+#include <cbmem.h>
 #include <cpu/x86/smm.h>
 #include <soc/acpi.h>
 #include <soc/iomap.h>
 #include <soc/pm.h>
+#include <soc/nvs.h>
 
 unsigned long acpi_fill_mcfg(unsigned long current)
 {
@@ -125,3 +128,29 @@ unsigned long southbridge_write_acpi_tables(device_t device,
 {
 	return acpi_write_hpet(device, current, rsdp);
 }
+
+static void acpi_create_gnvs(struct global_nvs_t *gnvs)
+{
+	if (IS_ENABLED(CONFIG_CHROMEOS)) {
+		/* Initialize Verified Boot data */
+		chromeos_init_vboot(&gnvs->chromeos);
+		gnvs->chromeos.vbt2 = ACTIVE_ECFW_RO;
+	}
+}
+
+void southbridge_inject_dsdt(device_t device)
+{
+	struct global_nvs_t *gnvs;
+
+	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
+
+	if (gnvs) {
+		acpi_create_gnvs(gnvs);
+		acpi_save_gnvs((uintptr_t)gnvs);
+
+		/* Add it to DSDT.  */
+		acpigen_write_scope("\\");
+		acpigen_write_name_dword("NVSA", (uintptr_t)gnvs);
+		acpigen_pop_len();
+	}
+}

src/soc/intel/apollolake/acpi/globalnvs.asl

@@ -0,0 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corp.
+ * (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for Intel Corp.)
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+/*
+ * NOTE: The layout of the GNVS structure below must match the layout in
+ * soc/intel/apollolake/include/soc/nvs.h !!!
+ *
+ */
+
+External (NVSA)
+
+OperationRegion (GNVS, SystemMemory, NVSA, 0x1000)
+Field (GNVS, ByteAcc, NoLock, Preserve)
+{
+	/* Nothing here yet, folks */
+	Offset (0x00),
+
+	/* ChromeOS stuff (0x100 -> 0xfff, size 0xeff) */
+	Offset (0x100),
+	#include <vendorcode/google/chromeos/acpi/gnvs.asl>
+}

src/soc/intel/apollolake/chip.c

@@ -17,6 +17,7 @@
  */
 
 #include <bootstate.h>
+#include <cbmem.h>
 #include <console/console.h>
 #include <cpu/cpu.h>
 #include <device/device.h>
@@ -26,6 +27,7 @@
 #include <memrange.h>
 #include <soc/iomap.h>
 #include <soc/cpu.h>
+#include <soc/nvs.h>
 #include <soc/pci_devs.h>
 
 #include "chip.h"
@@ -65,11 +67,15 @@ static void enable_dev(device_t dev)
 static void soc_init(void *data)
 {
 	struct range_entry range;
+	struct global_nvs_t *gnvs;
 
 	/* TODO: tigten this resource range */
 	/* TODO: fix for S3 resume, as this would corrupt OS memory */
 	range_entry_init(&range, 0x200000, 4ULL*GiB, 0);
 	fsp_silicon_init(&range);
+
+	/* Allocate ACPI NVS in CBMEM */
+	gnvs = cbmem_add(CBMEM_ID_ACPI_GNVS, sizeof(*gnvs));
 }
 
 void platform_fsp_silicon_init_params_cb(struct FSPS_UPD *silupd)

src/soc/intel/apollolake/include/soc/acpi.h

@@ -25,4 +25,6 @@ void soc_fill_common_fadt(acpi_fadt_t * fadt);
 unsigned long southbridge_write_acpi_tables(device_t device,
 		unsigned long current, struct acpi_rsdp *rsdp);
 
+void southbridge_inject_dsdt(device_t device);
+
 #endif	/* _SOC_APOLLOLAKE_ACPI_H_ */

src/soc/intel/apollolake/include/soc/nvs.h

@@ -0,0 +1,37 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Intel Corp.
+ * (Written by Lance Zhao <lijian.zhao@intel.com> for Intel Corp.)
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+/*
+ * NOTE: The layout of the global_nvs_t structure below must match the layout
+ * in soc/intel/apollolake/acpi/globalnvs.asl !!!
+ *
+ */
+
+#ifndef _SOC_APOLLOLAKE_NVS_H_
+#define _SOC_APOLLOLAKE_NVS_H_
+
+#include <vendorcode/google/chromeos/gnvs.h>
+
+struct global_nvs_t {
+	/* Miscellaneous */
+	uint8_t unused[256];
+
+	/* ChromeOS specific (0x100 - 0xfff) */
+	chromeos_acpi_t chromeos;
+} __attribute__((packed));
+
+#endif	/* _SOC_APOLLOLAKE_NVS_H_ */

src/soc/intel/apollolake/lpc.c

@@ -86,6 +86,7 @@ static struct device_operations device_ops = {
 	.set_resources = &pci_dev_set_resources,
 	.enable_resources = &pci_dev_enable_resources,
 	.write_acpi_tables = southbridge_write_acpi_tables,
+	.acpi_inject_dsdt_generator = southbridge_inject_dsdt,
 	.init = &lpc_init
 };