soc/intel/common/tcss: Configure USB-C ports with attached devices

Inspect all type-C USB ports, check if there is a USB device attached,
and if so, send the connection request to the PMC. This allows for any
attached USB2/USB3 devices to be used for booting by the payload.

Since this functionality is only needed by ChromeOS devices with TCSS
running upstream coreboot, introduce a new Kconfig to guard its use.
Boards needing it will select it in subsequent commits.

TEST=tested with rest of patch train

Change-Id: I69522dbcc8cae6bbf41659ae653107d0e031c812
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72909
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 37 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/tcss/Kconfig b/src/soc/intel/common/block/tcss/Kconfig
index 2e679138cd..4af75fc559 100644
--- a/src/soc/intel/common/block/tcss/Kconfig
+++ b/src/soc/intel/common/block/tcss/Kconfig
@@ -9,3 +9,11 @@ config ENABLE_TCSS_DISPLAY_DETECTION
 	depends on SOC_INTEL_COMMON_BLOCK_TCSS && RUN_FSP_GOP
 	help
 	  Enable displays to be detected over Type-C ports during boot.
+
+config ENABLE_TCSS_USB_DETECTION
+	bool "Enable detection of USB boot devices attached to USB Type-C ports with TCSS"
+	depends on SOC_INTEL_COMMON_BLOCK_TCSS
+	help
+	  Enable USB-C attached storage devices to be detected at boot.
+	  This option is required for some payloads (eg, edk2), without which devices attached
+	  to USB-C ports will not be detected and available to boot from.
diff --git a/src/soc/intel/common/block/tcss/tcss.c b/src/soc/intel/common/block/tcss/tcss.c
index 23427b444e..7c58e3ae58 100644
--- a/src/soc/intel/common/block/tcss/tcss.c
+++ b/src/soc/intel/common/block/tcss/tcss.c
@@ -340,6 +340,32 @@ static void tcss_configure_dp_mode(const struct tcss_port_map *port_map, size_t
 	}
 }
 
+static void tcss_configure_usb_mode(const struct tcss_port_map *port_map, size_t num_ports)
+{
+	int ret;
+	size_t i;
+	const struct usbc_ops *ops;
+	struct usbc_mux_info mux_info;
+	const struct tcss_port_map *port_info;
+
+	ops = usbc_get_ops();
+	if (ops == NULL)
+		return;
+
+	for (i = 0; i < num_ports; i++) {
+		ret = ops->mux_ops.get_mux_info(i, &mux_info);
+		if ((ret < 0) || !mux_info.usb || (mux_info.dp && mux_info.hpd_lvl))
+			continue;
+
+		port_info = &port_map[i];
+		ret = send_pmc_connect_request(i, &mux_info, port_info);
+		if (ret) {
+			printk(BIOS_ERR, "Port %zu connect request failed\n", i);
+			continue;
+		}
+	}
+}
+
 static uint32_t calc_bias_ctrl_reg_value(gpio_t pad)
 {
 	unsigned int vw_index, vw_bit;
@@ -429,6 +455,9 @@ void tcss_configure(const struct typec_aux_bias_pads aux_bias_pads[MAX_TYPE_C_PO
 
 		if (CONFIG(ENABLE_TCSS_DISPLAY_DETECTION))
 			tcss_configure_dp_mode(port_map, num_ports);
+
+		if (CONFIG(ENABLE_TCSS_USB_DETECTION))
+			tcss_configure_usb_mode(port_map, num_ports);
 	}
 }