google/snappy: Override SKU ID by VPD

Since snappy PCB may have over 9 SKU and current GPIO board ID GP16/GP17
is insufficient to use.
Using VPD to control could prevent H/W change.

BUG=b:65339688
BRANCH=reef
TEST=emerge-snappy coreboot
Change-Id: I55ab741354797e022dd945da9c8499ee5e041316
Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com>
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/21533
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/src/mainboard/google/reef/variants/snappy/mainboard.c b/src/mainboard/google/reef/variants/snappy/mainboard.c
index a04f61a72f..2767df245e 100644
--- a/src/mainboard/google/reef/variants/snappy/mainboard.c
+++ b/src/mainboard/google/reef/variants/snappy/mainboard.c
@@ -13,10 +13,53 @@
  * GNU General Public License for more details.
  */
 
+#include <string.h>
 #include <baseboard/variants.h>
 #include <ec/google/chromeec/ec.h>
+#include <vendorcode/google/chromeos/cros_vpd.h>
 
 void variant_board_ec_set_skuid(void)
 {
 	google_chromeec_set_sku_id(variant_board_sku());
 }
+
+/*
+ * override SKU ID by VPD definition
+ */
+uint8_t variant_board_sku(void)
+{
+	static int board_sku_num = -1;
+	int vpd_sku_num;
+	char vpd_skuid[] = "skuid";
+	char vpd_buffer[4];
+	int vpd_len;
+	int i;
+
+	if (board_sku_num != -1)
+		return board_sku_num;
+
+	board_sku_num = sku_strapping_value();
+
+	if (!IS_ENABLED(CONFIG_CHROMEOS))
+		return board_sku_num;
+
+	if (!cros_vpd_gets(vpd_skuid, vpd_buffer, ARRAY_SIZE(vpd_buffer)))
+		return board_sku_num;
+
+	vpd_len = strlen(vpd_buffer);
+
+	vpd_sku_num = 0;
+	for (i = 0; i < vpd_len; i++) {
+		char ch = vpd_buffer[i];
+		if ((ch < '0') || (ch > '9')) {
+			vpd_sku_num = -1;
+			break;
+		} else
+			vpd_sku_num = vpd_sku_num * 10 + (ch - '0');
+	}
+
+	if (vpd_sku_num != -1)
+		board_sku_num = vpd_sku_num;
+
+	return board_sku_num;
+}