[S] Change in coreboot[main]: drivers/intel/usb4: Add mainboard function to get EC port

[Derek Huang (Code Review)]

Derek Huang has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/86673?usp=email )

Change subject: drivers/intel/usb4: Add mainboard function to get EC port
......................................................................

drivers/intel/usb4: Add mainboard function to get EC port

This patch adds mainboard override function which allows for
custome port mapping between CPU physical port and EC port to
accommodate the non-sequential mapping. Mainboard code must
implement this function if the CPU physical port to EC port
mapping is not sequential.

BUG=b:399032094
TEST=build and verify TCSS port and EC port mapping

Change-Id: Ibaad2a95d8624564ae012d23e8a7f19f6701db2c
Signed-off-by: Derek Huang 
---
M src/drivers/intel/usb4/retimer/retimer.h
M src/soc/intel/meteorlake/retimer.c
2 files changed, 25 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/73/86673/1

diff --git a/src/drivers/intel/usb4/retimer/retimer.h b/src/drivers/intel/usb4/retimer/retimer.h
index 228f29b..7f811b1 100644
--- a/src/drivers/intel/usb4/retimer/retimer.h
+++ b/src/drivers/intel/usb4/retimer/retimer.h
@@ -51,4 +51,16 @@
  */
 int retimer_get_index_for_typec(uint8_t typec_port);

+/*
+ * This function maps CPU physical ports to EC logical ports.
+ * Mainboard designs may not have a sequential mapping between CPU
+ * physical ports and EC ports. For example, a board might enable TCSS
+ * ports 1 and 2, which map to EC ports 1 and 0, respectively.
+ * This function allows for custom port mapping to accommodate
+ * these non-sequential designs. Mainboard code must implement this
+ * function if the CPU physical port to EC port mapping is not
+ * sequential.
+ */
+int mainboard_retimer_get_index_for_typec(uint8_t typec_port);
+
 #endif /* _DRIVERS_INTEL_USB4_RETIMER_H_ */
diff --git a/src/soc/intel/meteorlake/retimer.c b/src/soc/intel/meteorlake/retimer.c
index a559cfc..7f708d0 100644
--- a/src/soc/intel/meteorlake/retimer.c
+++ b/src/soc/intel/meteorlake/retimer.c
@@ -6,10 +6,23 @@
 #include <intelblocks/tcss.h>
 #include <static.h>

+__weak int mainboard_retimer_get_index_for_typec(uint8_t typec_port)
+{
+	return -1;
+}
+
 int retimer_get_index_for_typec(uint8_t typec_port)
 {
    int ec_port = 0;

+	ec_port = mainboard_retimer_get_index_for_typec(typec_port);
+	if (ec_port >= 0) {
+		printk(BIOS_INFO, "USB Type-C %d mapped to EC port %d\n", typec_port,
+		       ec_port);
+		return ec_port;
+	} else
+		ec_port = 0;
+
    const struct device *tcss_port_arr[] = {
    	DEV_PTR(tcss_usb3_port0),
    	DEV_PTR(tcss_usb3_port1),