[coreboot-gerrit] [S] Change in coreboot[main]: mb/google/rex/deku: Convert TCSS port number to EC port number

[Derek Huang (Code Review)]

Attention is currently required from: Dinesh Gehlot, Eran Mitrani, Jakub "Kuba" Czapiga, Kapil Porwal, Subrata Banik, Tarun.

Derek Huang has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/86675?usp=email )

Change subject: mb/google/rex/deku: Convert TCSS port number to EC port number
......................................................................

mb/google/rex/deku: Convert TCSS port number to EC port number

Deku design has a non-sequential mapping between CPU physical
Type-C ports and EC Typec-C ports. This patch implement
variant_retimer_get_index_for_typec function to convert TCSS
port number to EC port number.

BUG=b:399032094
TEST=Check the Type-C port and EC port mapping in coreboot log

deku-rev1 ~ # cbmem -c |grep "USB Type-C"
[INFO ]  USB Type-C 0 mapped to EC port 0
[INFO ]  USB Type-C 1 mapped to EC port 2
[INFO ]  USB Type-C 2 mapped to EC port 1
[INFO ]  USB Type-C 3 mapped to EC port 3

Change-Id: Ic0e153472783dd0aabb440cb885a49f440875657
Signed-off-by: Derek Huang 
---
M src/mainboard/google/rex/variants/deku/Makefile.mk
A src/mainboard/google/rex/variants/deku/variant.c
2 files changed, 25 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/75/86675/1

diff --git a/src/mainboard/google/rex/variants/deku/Makefile.mk b/src/mainboard/google/rex/variants/deku/Makefile.mk
index 090dd5b..f9db814 100644
--- a/src/mainboard/google/rex/variants/deku/Makefile.mk
+++ b/src/mainboard/google/rex/variants/deku/Makefile.mk
@@ -3,4 +3,4 @@
 bootblock-y += gpio.c
 romstage-y += gpio.c
 ramstage-y += gpio.c
-ramstage-y += ramstage.c
+ramstage-y += ramstage.c variant.c
diff --git a/src/mainboard/google/rex/variants/deku/variant.c b/src/mainboard/google/rex/variants/deku/variant.c
new file mode 100644
index 0000000..9fafa03
--- /dev/null
+++ b/src/mainboard/google/rex/variants/deku/variant.c
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <baseboard/variants.h>
+
+#define TYPE_C_PORT_NUMS 4
+
+/*
+ * ------------------------------
+ * | CPU TCSS port | EC port    |
+ * | 0             | 0          |
+ * | 1             | 2          |
+ * | 2             | 1          |
+ * | 3             | 3          |
+ * ------------------------------
+ */
+const uint8_t ec_port_mapping[] = {0, 2, 1, 3};
+
+int variant_retimer_get_index_for_typec(uint8_t typec_port)
+{
+	if (typec_port >= TYPE_C_PORT_NUMS)
+		return -1;
+
+	return ec_port_mapping[typec_port];
+}