ec/google/chromeec: add support for retrieving OEM name

OEM name can be stored in CBI. This change can support for fetching
the OEM name from CBI.

BUG=b:118798180
TEST=Verified to get data from CBI

Change-Id: I4938c4d60fcad9e1f43ef69cc4441d1653de7e24
Signed-off-by: Wisley Chen <wisley.chen@quantatw.com>
Reviewed-on: https://review.coreboot.org/29497
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

src/ec/google/chromeec/ec.c

@@ -611,10 +611,10 @@ int google_chromeec_cbi_get_oem_id(uint32_t *id)
 	return cbi_get_uint32(id, CBI_TAG_OEM_ID);
 }
 
-int google_chromeec_cbi_get_dram_part_num(char *buf, size_t bufsize)
+static int cbi_get_string(char *buf, size_t bufsize, uint32_t tag)
 {
 	struct ec_params_get_cbi p = {
-		.tag = CBI_TAG_DRAM_PART_NUM,
+		.tag = tag,
 	};
 	struct chromeec_command cmd = {
 		.cmd_code = EC_CMD_GET_CROS_BOARD_INFO,
@@ -636,6 +636,16 @@ int google_chromeec_cbi_get_dram_part_num(char *buf, size_t bufsize)
 	return 0;
 }
 
+int google_chromeec_cbi_get_dram_part_num(char *buf, size_t bufsize)
+{
+	return cbi_get_string(buf, bufsize, CBI_TAG_DRAM_PART_NUM);
+}
+
+int google_chromeec_cbi_get_oem_name(char *buf, size_t bufsize)
+{
+	return cbi_get_string(buf, bufsize, CBI_TAG_OEM_NAME);
+}
+
 int google_chromeec_get_board_version(uint32_t *version)
 {
 	struct chromeec_command cmd;

src/ec/google/chromeec/ec.h

@@ -84,6 +84,7 @@ int google_chromeec_reboot(int dev_idx, enum ec_reboot_cmd type, uint8_t flags);
 int google_chromeec_cbi_get_oem_id(uint32_t *id);
 int google_chromeec_cbi_get_sku_id(uint32_t *id);
 int google_chromeec_cbi_get_dram_part_num(char *buf, size_t bufsize);
+int google_chromeec_cbi_get_oem_name(char *buf, size_t bufsize);
 
 /* MEC uses 0x800/0x804 as register/index pair, thus an 8-byte resource. */
 #define MEC_EMI_BASE		0x800

src/ec/google/chromeec/ec_commands.h

@@ -4781,6 +4781,7 @@ enum cbi_data_tag {
 	CBI_TAG_OEM_ID = 1,        /* uint8_t */
 	CBI_TAG_SKU_ID = 2,        /* uint8_t */
 	CBI_TAG_DRAM_PART_NUM = 3, /* variable length ascii, nul terminated. */
+	CBI_TAG_OEM_NAME = 4,      /* variable length ascii, nul terminated. */
 	CBI_TAG_COUNT,
 };