mb/google/fizz: Provide nhlt variant API

Move current NHLT configuration implementation to baseboard so that
variants can leverage it or provide their own configuration.

BUG=b:117066935
BRANCH=Fizz
TEST=emerge-fizz coreboot

Change-Id: I30d93babb6fc09e8642b3740f1f7638fa33f0ade
Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/28965
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/fizz/mainboard.c

@@ -14,7 +14,7 @@
  */
 
 #include <arch/acpi.h>
-#include <console/console.h>
+#include <baseboard/variants.h>
 #include <chip.h>
 #include <device/device.h>
 #include <ec/ec.h>
@@ -194,8 +194,9 @@ static void mainboard_init(struct device *dev)
 static unsigned long mainboard_write_acpi_tables(
 	struct device *device, unsigned long current, acpi_rsdp_t *rsdp)
 {
-	const char *oem_id = "GOOGLE";
-	const char *oem_table_id = "FIZZ";
+	const char *oem_id = NULL;
+	const char *oem_table_id = NULL;
+	uint32_t oem_revision = 0;
 	uintptr_t start_addr;
 	uintptr_t end_addr;
 	struct nhlt *nhlt;
@@ -206,12 +207,11 @@ static unsigned long mainboard_write_acpi_tables(
 	if (!nhlt)
 		return start_addr;
 
-	/* RT5663 Headset codec */
-	if (nhlt_soc_add_rt5663(nhlt, AUDIO_LINK_SSP1))
-		printk(BIOS_ERR, "Couldn't add headset codec.\n");
+	variant_nhlt_init(nhlt);
+	variant_nhlt_oem_overrides(&oem_id, &oem_table_id, &oem_revision);
 
 	end_addr = nhlt_soc_serialize_oem_overrides(nhlt, start_addr,
-				oem_id, oem_table_id, 0);
+				oem_id, oem_table_id, oem_revision);
 
 	if (end_addr != start_addr)
 		acpi_add_table(rsdp, (void *)start_addr);

src/mainboard/google/fizz/variants/baseboard/Makefile.inc

@@ -1,3 +1,4 @@
 bootblock-y += gpio.c
 
 ramstage-y += gpio.c
+ramstage-y += nhlt.c

src/mainboard/google/fizz/variants/baseboard/include/baseboard/variants.h

@@ -29,4 +29,9 @@ const struct pad_config *variant_early_gpio_table(size_t *num);
 
 const struct cros_gpio *variant_cros_gpios(size_t *num);
 
+struct nhlt;
+void variant_nhlt_init(struct nhlt *nhlt);
+void variant_nhlt_oem_overrides(const char **oem_id, const char **oem_table_id,
+				uint32_t *oem_revision);
+
 #endif /* __BASEBOARD_VARIANTS_H__ */

src/mainboard/google/fizz/variants/baseboard/nhlt.c

@@ -0,0 +1,36 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 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 <baseboard/variants.h>
+#include <console/console.h>
+#include <nhlt.h>
+#include <soc/nhlt.h>
+
+void __weak variant_nhlt_init(struct nhlt *nhlt)
+{
+
+	/* RT5663 Headset codec */
+	if (nhlt_soc_add_rt5663(nhlt, AUDIO_LINK_SSP1))
+		printk(BIOS_ERR, "Couldn't add headset codec.\n");
+
+}
+
+void __weak variant_nhlt_oem_overrides(const char **oem_id,
+						const char **oem_table_id,
+						uint32_t *oem_revision)
+{
+	*oem_id = "GOOGLE";
+	*oem_table_id = "FIZZ";
+	*oem_revision = 0;
+}