nhlt: add api to override oem_id and oem_table_id of acpi_header_t

This patch added nhlt_soc_serialize_oem_overrides and
nhlt_serilalize_oem_overrides to be able to override oem_id and
oem_table_id.board file can pass specific string by calling
nhlt_soc_serialize_oem_overrides

kernel use these two fields to construct a topology binary name
if the designate file is not found a default dfw_sst.bin will be used
it is optional.

BUG=chrome-os-partner:49570
BRANCH=glados
TEST=Build & Booted kunimitsu board. Verified that kernel
can read new strings.

Change-Id: I00b64fb8bb63de601d3116e0b8941057c1efa230
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 374ce08b2d8a2f4e5dd7f51eacb505dbb77fd171
Original-Change-Id: I03623c8ac81efb5a5ea3ec9c6cd604d2e9294022
Original-Signed-off-by: Fang, Yang A <yang.a.fang@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/322860
Original-Commit-Ready: Yang Fang <yang.a.fang@intel.com>
Original-Tested-by: Yang Fang <yang.a.fang@intel.com>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/13602
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/include/nhlt.h

@@ -124,6 +124,15 @@ void nhlt_next_instance(struct nhlt *nhlt, int link_type);
  */
 uintptr_t nhlt_serialize(struct nhlt *nhlt, uintptr_t acpi_addr);
 
+/*
+ * Serialize NHLT object to ACPI table. Take in the beginning address of where
+ * the table will reside oem_id and oem_table_id and return the address of the
+ * next ACPI table. On error 0 will be returned. The NHLT object is no longer
+ * valid after thisfunction is called.
+ */
+uintptr_t nhlt_serialize_oem_overrides(struct nhlt *nhlt, uintptr_t acpi_addr,
+		const char *oem_id, const char *oem_table_id);
+
 /*
  * While very similar to nhlt_serialize() the SoC specific function allows
  * the chipset to perform any needed accounting work such as updating ACPI
@@ -131,6 +140,14 @@ uintptr_t nhlt_serialize(struct nhlt *nhlt, uintptr_t acpi_addr);
  */
 uintptr_t nhlt_soc_serialize(struct nhlt *nhlt, uintptr_t acpi_addr);
 
+/*
+ * While very similar to nhlt_serialize_oem_overrides() the SoC specific
+ * function allows the chipset to perform any needed accounting work such
+ * as updating ACPI field references for the serialized structure.
+ */
+uintptr_t nhlt_soc_serialize_oem_overrides(struct nhlt *nhlt,
+	uintptr_t acpi_addr, const char *oem_id, const char *oem_table_id);
+
 /* Link and device types. */
 enum {
 	NHLT_LINK_HDA,

src/lib/nhlt.c

@@ -388,10 +388,18 @@ static void nhlt_serialize_endpoints(struct nhlt *nhlt, struct cursor *cur)
 }
 
 uintptr_t nhlt_serialize(struct nhlt *nhlt, uintptr_t acpi_addr)
+{
+	return nhlt_serialize_oem_overrides(nhlt, acpi_addr, NULL, NULL);
+}
+
+uintptr_t nhlt_serialize_oem_overrides(struct nhlt *nhlt,
+	uintptr_t acpi_addr, const char *oem_id, const char *oem_table_id)
 {
 	struct cursor cur;
 	acpi_header_t *header;
 	size_t sz;
+	size_t oem_id_len;
+	size_t oem_table_id_len;
 
 	printk(BIOS_DEBUG, "ACPI:    * NHLT\n");
 
@@ -403,8 +411,18 @@ uintptr_t nhlt_serialize(struct nhlt *nhlt, uintptr_t acpi_addr)
 	memcpy(header->signature, "NHLT", 4);
 	write_le32(&header->length, sz);
 	write_le8(&header->revision, 5);
-	memcpy(header->oem_id, OEM_ID, 6);
+
-	memcpy(header->oem_table_id, ACPI_TABLE_CREATOR, 8);
+	if (oem_id == NULL)
+		oem_id = OEM_ID;
+
+	if (oem_table_id == NULL)
+		oem_table_id = ACPI_TABLE_CREATOR;
+
+	oem_id_len = MIN(strlen(oem_id), 6);
+	oem_table_id_len = MIN(strlen(oem_table_id), 8);
+
+	memcpy(header->oem_id, oem_id, oem_id_len);
+	memcpy(header->oem_table_id, oem_table_id, oem_table_id_len);
 	memcpy(header->asl_compiler_id, ASLC, 4);
 
 	cur.buf = (void *)(acpi_addr + sizeof(acpi_header_t));

src/soc/intel/skylake/nhlt/nhlt.c

@@ -86,6 +86,12 @@ struct nhlt_endpoint *nhlt_soc_add_endpoint(struct nhlt *nhlt, int soc_hwintf,
 }
 
 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;
 
@@ -98,5 +104,6 @@ uintptr_t nhlt_soc_serialize(struct nhlt *nhlt, uintptr_t acpi_addr)
 	gnvs->nhla = (uintptr_t)acpi_addr;
 	gnvs->nhll = nhlt_current_size(nhlt);
 
-	return nhlt_serialize(nhlt, acpi_addr);
+	return nhlt_serialize_oem_overrides(nhlt, acpi_addr,
+						oem_id, oem_table_id);
 }