thunderbolt: Add USB4 router operation proxy for firmware connection manager

Intel Maple Ridge and Tiger Lake connection manager firmware implements
a USB4 router operation proxy that should be used instead of direct
register access to avoid races with the firmware. This is supported in
all firmwares where the protocol version field returned in the driver
ready response is 3 (or higher).

This adds the USB4 router proxy operations support to the driver so that
we first check the protocol version and if it is 3 (or higher) the USB4
router operation is run through the firmware provided proxy. Otherwise
the native version is used.

Most USB4 router proxy operations are pretty straightforward except
NVM_AUTH where the firmware only responds once the router is restarted
but before it sends device connected notification. To support this we
split the operation so that the reply is received asynchronously and
stored to struct icm. This last reply is then returned in
icm_usb4_switch_nvm_authenticate_status() if available.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/thunderbolt/tb_msgs.h

@@ -106,6 +106,7 @@ enum icm_pkg_code {
 	ICM_APPROVE_XDOMAIN = 0x10,
 	ICM_DISCONNECT_XDOMAIN = 0x11,
 	ICM_PREBOOT_ACL = 0x18,
+	ICM_USB4_SWITCH_OP = 0x20,
 };
 
 enum icm_event_code {
@@ -343,6 +344,8 @@ struct icm_tr_pkg_driver_ready_response {
 #define ICM_TR_FLAGS_RTD3		BIT(6)
 
 #define ICM_TR_INFO_SLEVEL_MASK		GENMASK(2, 0)
+#define ICM_TR_INFO_PROTO_VERSION_MASK	GENMASK(6, 4)
+#define ICM_TR_INFO_PROTO_VERSION_SHIFT	4
 #define ICM_TR_INFO_BOOT_ACL_SHIFT	7
 #define ICM_TR_INFO_BOOT_ACL_MASK	GENMASK(12, 7)
 
@@ -478,6 +481,31 @@ struct icm_icl_event_rtd3_veto {
 	u32 veto_reason;
 };
 
+/* USB4 ICM messages */
+
+struct icm_usb4_switch_op {
+	struct icm_pkg_header hdr;
+	u32 route_hi;
+	u32 route_lo;
+	u32 metadata;
+	u16 opcode;
+	u16 data_len_valid;
+	u32 data[16];
+};
+
+#define ICM_USB4_SWITCH_DATA_LEN_MASK	GENMASK(3, 0)
+#define ICM_USB4_SWITCH_DATA_VALID	BIT(4)
+
+struct icm_usb4_switch_op_response {
+	struct icm_pkg_header hdr;
+	u32 route_hi;
+	u32 route_lo;
+	u32 metadata;
+	u16 opcode;
+	u16 status;
+	u32 data[16];
+};
+
 /* XDomain messages */
 
 struct tb_xdomain_header {