soc/intel/{common,skylake}: provide common NHLT SoC support

The nhlt_soc_serialize() and nhlt_soc_serialize_oem_overrides()
functions should be able to be leveraged on all Intel SoCs
which support NHLT. Therefore provide that functionality and
make skylake use it.

Change-Id: Ib5535cc874f2680ec22554cecaf97b09753cacd0
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15490
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)

src/soc/intel/common/Kconfig

@@ -99,4 +99,8 @@ config SOC_INTEL_COMMON_ACPI
 	bool
 	default n
 
+config SOC_INTEL_COMMON_NHLT
+	bool
+	default n
+
 endif # SOC_INTEL_COMMON

src/soc/intel/common/Makefile.inc

@@ -20,6 +20,7 @@ ramstage-$(CONFIG_SOC_INTEL_COMMON_ACPI_WAKE_SOURCE) += acpi_wake_source.c
 ramstage-y += vbt.c
 ramstage-$(CONFIG_SOC_INTEL_COMMON_GFX_OPREGION) += opregion.c
 ramstage-$(CONFIG_SOC_INTEL_COMMON_ACPI) += ./acpi/acpi.c
+ramstage-$(CONFIG_SOC_INTEL_COMMON_NHLT) += nhlt.c
 
 smm-$(CONFIG_SOC_INTEL_COMMON_SMI) += smihandler.c
 

src/soc/intel/common/nhlt.c

@@ -0,0 +1,41 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google, Inc.
+ *
+ * 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.
+ */
+
+#include <cbmem.h>
+#include <nhlt.h>
+#include <soc/acpi.h>
+
+uintptr_t nhlt_soc_serialize(struct nhlt *nhlt, uintptr_t acpi_addr)
+{
+	return nhlt_soc_serialize_oem_overrides(nhlt, acpi_addr, NULL, NULL);
+}
+
+uintptr_t nhlt_soc_serialize_oem_overrides(struct nhlt *nhlt,
+	uintptr_t acpi_addr, const char *oem_id, const char *oem_table_id)
+{
+	global_nvs_t *gnvs;
+
+	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
+
+	if (gnvs == NULL)
+		return acpi_addr;
+
+	/* Update NHLT GNVS Data */
+	gnvs->nhla = (uintptr_t)acpi_addr;
+	gnvs->nhll = nhlt_current_size(nhlt);
+
+	return nhlt_serialize_oem_overrides(nhlt, acpi_addr,
+						oem_id, oem_table_id);
+}