Change in coreboot[master]: soc/intel/tigerlake: Implement function to map physical port to EC port

[John Zhao (Code Review)]

John Zhao has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/60972 )

Change subject: soc/intel/tigerlake: Implement function to map physical port to EC port
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soc/intel/tigerlake: Implement function to map physical port to EC port

Currently coreboot and EC had different logic to interpret TCSS port
number which would break retimer update functionality since coreboot
would pass wrong port information to EC.

This change clones the implementation on Alder Lake which converts
the phyiscal port mapping to EC's abstract port mapping.

BUG=b:207057940
BRANCH=None

Signed-off-by: jzhao80 
Change-Id: If4451598dbb83528ae6d88dbc1b65c206f24fe1f
---
M src/soc/intel/tigerlake/Makefile.inc
A src/soc/intel/tigerlake/retimer.c
2 files changed, 33 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/72/60972/1

diff --git a/src/soc/intel/tigerlake/Makefile.inc b/src/soc/intel/tigerlake/Makefile.inc
index 25a1d65..0b616be 100644
--- a/src/soc/intel/tigerlake/Makefile.inc
+++ b/src/soc/intel/tigerlake/Makefile.inc
@@ -37,6 +37,7 @@
 ramstage-y += pcie_rp.c
 ramstage-y += pmc.c
 ramstage-y += reset.c
+ramstage-y += retimer.c
 ramstage-y += soundwire.c
 ramstage-y += systemagent.c
 ramstage-y += xhci.c
diff --git a/src/soc/intel/tigerlake/retimer.c b/src/soc/intel/tigerlake/retimer.c
new file mode 100644
index 0000000..09bf112
--- /dev/null
+++ b/src/soc/intel/tigerlake/retimer.c
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <drivers/intel/usb4/retimer/retimer.h>
+#include <intelblocks/tcss.h>
+
+int retimer_get_index_for_typec(uint8_t typec_port)
+{
+	int ec_port = 0;
+
+	const struct device *tcss_port_arr[] = {
+		DEV_PTR(tcss_usb3_port1),
+		DEV_PTR(tcss_usb3_port2),
+		DEV_PTR(tcss_usb3_port3),
+		DEV_PTR(tcss_usb3_port4),
+	};
+
+	for (uint8_t i = 0; i < MAX_TYPE_C_PORTS; i++) {
+		if (i == typec_port) {
+			printk(BIOS_ERR, "USB Type-C %d mapped to EC port %d\n", typec_port,
+					ec_port);
+			return ec_port;
+		}
+
+		if (is_dev_enabled(tcss_port_arr[i]))
+			ec_port++;
+	}
+
+	// Code should not come here if typec_port input is correct
+	return -1;
+}