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>

1 files changed, 20 insertions, 2 deletions

diff --git a/src/lib/nhlt.c b/src/lib/nhlt.c
index 4fa4a0c2c1d7..11a397ca8ef1 100644
--- a/src/lib/nhlt.c
+++ b/src/lib/nhlt.c
@@ -389,9 +389,17 @@ 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));