Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1383 insertions, 0 deletions

diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
new file mode 100644
index 0000000000..d2a55ad2fd
--- /dev/null
+++ b/drivers/thunderbolt/tb.h
@@ -0,0 +1,1383 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Thunderbolt driver - bus logic (NHI independent)
+ *
+ * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
+ * Copyright (C) 2018, Intel Corporation
+ */
+
+#ifndef TB_H_
+#define TB_H_
+
+#include <linux/nvmem-provider.h>
+#include <linux/pci.h>
+#include <linux/thunderbolt.h>
+#include <linux/uuid.h>
+#include <linux/bitfield.h>
+
+#include "tb_regs.h"
+#include "ctl.h"
+#include "dma_port.h"
+
+/* Keep link controller awake during update */
+#define QUIRK_FORCE_POWER_LINK_CONTROLLER		BIT(0)
+/* Disable CLx if not supported */
+#define QUIRK_NO_CLX					BIT(1)
+
+/**
+ * struct tb_nvm - Structure holding NVM information
+ * @dev: Owner of the NVM
+ * @major: Major version number of the active NVM portion
+ * @minor: Minor version number of the active NVM portion
+ * @id: Identifier used with both NVM portions
+ * @active: Active portion NVMem device
+ * @active_size: Size in bytes of the active NVM
+ * @non_active: Non-active portion NVMem device
+ * @buf: Buffer where the NVM image is stored before it is written to
+ *	 the actual NVM flash device
+ * @buf_data_start: Where the actual image starts after skipping
+ *		    possible headers
+ * @buf_data_size: Number of bytes actually consumed by the new NVM
+ *		   image
+ * @authenticating: The device is authenticating the new NVM
+ * @flushed: The image has been flushed to the storage area
+ * @vops: Router vendor specific NVM operations (optional)
+ *
+ * The user of this structure needs to handle serialization of possible
+ * concurrent access.
+ */
+struct tb_nvm {
+	struct device *dev;
+	u32 major;
+	u32 minor;
+	int id;
+	struct nvmem_device *active;
+	size_t active_size;
+	struct nvmem_device *non_active;
+	void *buf;
+	void *buf_data_start;
+	size_t buf_data_size;
+	bool authenticating;
+	bool flushed;
+	const struct tb_nvm_vendor_ops *vops;
+};
+
+enum tb_nvm_write_ops {
+	WRITE_AND_AUTHENTICATE = 1,
+	WRITE_ONLY = 2,
+	AUTHENTICATE_ONLY = 3,
+};
+
+#define TB_SWITCH_KEY_SIZE		32
+#define TB_SWITCH_MAX_DEPTH		6
+#define USB4_SWITCH_MAX_DEPTH		5
+
+/**
+ * enum tb_switch_tmu_mode - TMU mode
+ * @TB_SWITCH_TMU_MODE_OFF: TMU is off
+ * @TB_SWITCH_TMU_MODE_LOWRES: Uni-directional, normal mode
+ * @TB_SWITCH_TMU_MODE_HIFI_UNI: Uni-directional, HiFi mode
+ * @TB_SWITCH_TMU_MODE_HIFI_BI: Bi-directional, HiFi mode
+ * @TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI: Enhanced Uni-directional, MedRes mode
+ *
+ * Ordering is based on TMU accuracy level (highest last).
+ */
+enum tb_switch_tmu_mode {
+	TB_SWITCH_TMU_MODE_OFF,
+	TB_SWITCH_TMU_MODE_LOWRES,
+	TB_SWITCH_TMU_MODE_HIFI_UNI,
+	TB_SWITCH_TMU_MODE_HIFI_BI,
+	TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI,
+};
+
+/**
+ * struct tb_switch_tmu - Structure holding router TMU configuration
+ * @cap: Offset to the TMU capability (%0 if not found)
+ * @has_ucap: Does the switch support uni-directional mode
+ * @mode: TMU mode related to the upstream router. Reflects the HW
+ *	  setting. Don't care for host router.
+ * @mode_request: TMU mode requested to set. Related to upstream router.
+ *		   Don't care for host router.
+ */
+struct tb_switch_tmu {
+	int cap;
+	bool has_ucap;
+	enum tb_switch_tmu_mode mode;
+	enum tb_switch_tmu_mode mode_request;
+};
+
+/**
+ * struct tb_switch - a thunderbolt switch
+ * @dev: Device for the switch
+ * @config: Switch configuration
+ * @ports: Ports in this switch
+ * @dma_port: If the switch has port supporting DMA configuration based
+ *	      mailbox this will hold the pointer to that (%NULL
+ *	      otherwise). If set it also means the switch has
+ *	      upgradeable NVM.
+ * @tmu: The switch TMU configuration
+ * @tb: Pointer to the domain the switch belongs to
+ * @uid: Unique ID of the switch
+ * @uuid: UUID of the switch (or %NULL if not supported)
+ * @vendor: Vendor ID of the switch
+ * @device: Device ID of the switch
+ * @vendor_name: Name of the vendor (or %NULL if not known)
+ * @device_name: Name of the device (or %NULL if not known)
+ * @link_speed: Speed of the link in Gb/s
+ * @link_width: Width of the upstream facing link
+ * @link_usb4: Upstream link is USB4
+ * @generation: Switch Thunderbolt generation
+ * @cap_plug_events: Offset to the plug events capability (%0 if not found)
+ * @cap_vsec_tmu: Offset to the TMU vendor specific capability (%0 if not found)
+ * @cap_lc: Offset to the link controller capability (%0 if not found)
+ * @cap_lp: Offset to the low power (CLx for TBT) capability (%0 if not found)
+ * @is_unplugged: The switch is going away
+ * @drom: DROM of the switch (%NULL if not found)
+ * @nvm: Pointer to the NVM if the switch has one (%NULL otherwise)
+ * @no_nvm_upgrade: Prevent NVM upgrade of this switch
+ * @safe_mode: The switch is in safe-mode
+ * @boot: Whether the switch was already authorized on boot or not
+ * @rpm: The switch supports runtime PM
+ * @authorized: Whether the switch is authorized by user or policy
+ * @security_level: Switch supported security level
+ * @debugfs_dir: Pointer to the debugfs structure
+ * @key: Contains the key used to challenge the device or %NULL if not
+ *	 supported. Size of the key is %TB_SWITCH_KEY_SIZE.
+ * @connection_id: Connection ID used with ICM messaging
+ * @connection_key: Connection key used with ICM messaging
+ * @link: Root switch link this switch is connected (ICM only)
+ * @depth: Depth in the chain this switch is connected (ICM only)
+ * @rpm_complete: Completion used to wait for runtime resume to
+ *		  complete (ICM only)
+ * @quirks: Quirks used for this Thunderbolt switch
+ * @credit_allocation: Are the below buffer allocation parameters valid
+ * @max_usb3_credits: Router preferred number of buffers for USB 3.x
+ * @min_dp_aux_credits: Router preferred minimum number of buffers for DP AUX
+ * @min_dp_main_credits: Router preferred minimum number of buffers for DP MAIN
+ * @max_pcie_credits: Router preferred number of buffers for PCIe
+ * @max_dma_credits: Router preferred number of buffers for DMA/P2P
+ * @clx: CLx states on the upstream link of the router
+ *
+ * When the switch is being added or removed to the domain (other
+ * switches) you need to have domain lock held.
+ *
+ * In USB4 terminology this structure represents a router.
+ *
+ * Note @link_width is not the same as whether link is bonded or not.
+ * For Gen 4 links the link is also bonded when it is asymmetric. The
+ * correct way to find out whether the link is bonded or not is to look
+ * @bonded field of the upstream port.
+ */
+struct tb_switch {
+	struct device dev;
+	struct tb_regs_switch_header config;
+	struct tb_port *ports;
+	struct tb_dma_port *dma_port;
+	struct tb_switch_tmu tmu;
+	struct tb *tb;
+	u64 uid;
+	uuid_t *uuid;
+	u16 vendor;
+	u16 device;
+	const char *vendor_name;
+	const char *device_name;
+	unsigned int link_speed;
+	enum tb_link_width link_width;
+	bool link_usb4;
+	unsigned int generation;
+	int cap_plug_events;
+	int cap_vsec_tmu;
+	int cap_lc;
+	int cap_lp;
+	bool is_unplugged;
+	u8 *drom;
+	struct tb_nvm *nvm;
+	bool no_nvm_upgrade;
+	bool safe_mode;
+	bool boot;
+	bool rpm;
+	unsigned int authorized;
+	enum tb_security_level security_level;
+	struct dentry *debugfs_dir;
+	u8 *key;
+	u8 connection_id;
+	u8 connection_key;
+	u8 link;
+	u8 depth;
+	struct completion rpm_complete;
+	unsigned long quirks;
+	bool credit_allocation;
+	unsigned int max_usb3_credits;
+	unsigned int min_dp_aux_credits;
+	unsigned int min_dp_main_credits;
+	unsigned int max_pcie_credits;
+	unsigned int max_dma_credits;
+	unsigned int clx;
+};
+
+/**
+ * struct tb_bandwidth_group - Bandwidth management group
+ * @tb: Pointer to the domain the group belongs to
+ * @index: Index of the group (aka Group_ID). Valid values %1-%7
+ * @ports: DP IN adapters belonging to this group are linked here
+ *
+ * Any tunnel that requires isochronous bandwidth (that's DP for now) is
+ * attached to a bandwidth group. All tunnels going through the same
+ * USB4 links share the same group and can dynamically distribute the
+ * bandwidth within the group.
+ */
+struct tb_bandwidth_group {
+	struct tb *tb;
+	int index;
+	struct list_head ports;
+};
+
+/**
+ * struct tb_port - a thunderbolt port, part of a tb_switch
+ * @config: Cached port configuration read from registers
+ * @sw: Switch the port belongs to
+ * @remote: Remote port (%NULL if not connected)
+ * @xdomain: Remote host (%NULL if not connected)
+ * @cap_phy: Offset, zero if not found
+ * @cap_tmu: Offset of the adapter specific TMU capability (%0 if not present)
+ * @cap_adap: Offset of the adapter specific capability (%0 if not present)
+ * @cap_usb4: Offset to the USB4 port capability (%0 if not present)
+ * @usb4: Pointer to the USB4 port structure (only if @cap_usb4 is != %0)
+ * @port: Port number on switch
+ * @disabled: Disabled by eeprom or enabled but not implemented
+ * @bonded: true if the port is bonded (two lanes combined as one)
+ * @dual_link_port: If the switch is connected using two ports, points
+ *		    to the other port.
+ * @link_nr: Is this primary or secondary port on the dual_link.
+ * @in_hopids: Currently allocated input HopIDs
+ * @out_hopids: Currently allocated output HopIDs
+ * @list: Used to link ports to DP resources list
+ * @total_credits: Total number of buffers available for this port
+ * @ctl_credits: Buffers reserved for control path
+ * @dma_credits: Number of credits allocated for DMA tunneling for all
+ *		 DMA paths through this port.
+ * @group: Bandwidth allocation group the adapter is assigned to. Only
+ *	   used for DP IN adapters for now.
+ * @group_list: The adapter is linked to the group's list of ports through this
+ * @max_bw: Maximum possible bandwidth through this adapter if set to
+ *	    non-zero.
+ *
+ * In USB4 terminology this structure represents an adapter (protocol or
+ * lane adapter).
+ */
+struct tb_port {
+	struct tb_regs_port_header config;
+	struct tb_switch *sw;
+	struct tb_port *remote;
+	struct tb_xdomain *xdomain;
+	int cap_phy;
+	int cap_tmu;
+	int cap_adap;
+	int cap_usb4;
+	struct usb4_port *usb4;
+	u8 port;
+	bool disabled;
+	bool bonded;
+	struct tb_port *dual_link_port;
+	u8 link_nr:1;
+	struct ida in_hopids;
+	struct ida out_hopids;
+	struct list_head list;
+	unsigned int total_credits;
+	unsigned int ctl_credits;
+	unsigned int dma_credits;
+	struct tb_bandwidth_group *group;
+	struct list_head group_list;
+	unsigned int max_bw;
+};
+
+/**
+ * struct usb4_port - USB4 port device
+ * @dev: Device for the port
+ * @port: Pointer to the lane 0 adapter
+ * @can_offline: Does the port have necessary platform support to moved
+ *		 it into offline mode and back
+ * @offline: The port is currently in offline mode
+ * @margining: Pointer to margining structure if enabled
+ */
+struct usb4_port {
+	struct device dev;
+	struct tb_port *port;
+	bool can_offline;
+	bool offline;
+#ifdef CONFIG_USB4_DEBUGFS_MARGINING
+	struct tb_margining *margining;
+#endif
+};
+
+/**
+ * tb_retimer: Thunderbolt retimer
+ * @dev: Device for the retimer
+ * @tb: Pointer to the domain the retimer belongs to
+ * @index: Retimer index facing the router USB4 port
+ * @vendor: Vendor ID of the retimer
+ * @device: Device ID of the retimer
+ * @port: Pointer to the lane 0 adapter
+ * @nvm: Pointer to the NVM if the retimer has one (%NULL otherwise)
+ * @no_nvm_upgrade: Prevent NVM upgrade of this retimer
+ * @auth_status: Status of last NVM authentication
+ */
+struct tb_retimer {
+	struct device dev;
+	struct tb *tb;
+	u8 index;
+	u32 vendor;
+	u32 device;
+	struct tb_port *port;
+	struct tb_nvm *nvm;
+	bool no_nvm_upgrade;
+	u32 auth_status;
+};
+
+/**
+ * struct tb_path_hop - routing information for a tb_path
+ * @in_port: Ingress port of a switch
+ * @out_port: Egress port of a switch where the packet is routed out
+ *	      (must be on the same switch than @in_port)
+ * @in_hop_index: HopID where the path configuration entry is placed in
+ *		  the path config space of @in_port.
+ * @in_counter_index: Used counter index (not used in the driver
+ *		      currently, %-1 to disable)
+ * @next_hop_index: HopID of the packet when it is routed out from @out_port
+ * @initial_credits: Number of initial flow control credits allocated for
+ *		     the path
+ * @nfc_credits: Number of non-flow controlled buffers allocated for the
+ *		 @in_port.
+ *
+ * Hop configuration is always done on the IN port of a switch.
+ * in_port and out_port have to be on the same switch. Packets arriving on
+ * in_port with "hop" = in_hop_index will get routed to through out_port. The
+ * next hop to take (on out_port->remote) is determined by
+ * next_hop_index. When routing packet to another switch (out->remote is
+ * set) the @next_hop_index must match the @in_hop_index of that next
+ * hop to make routing possible.
+ *
+ * in_counter_index is the index of a counter (in TB_CFG_COUNTERS) on the in
+ * port.
+ */
+struct tb_path_hop {
+	struct tb_port *in_port;
+	struct tb_port *out_port;
+	int in_hop_index;
+	int in_counter_index;
+	int next_hop_index;
+	unsigned int initial_credits;
+	unsigned int nfc_credits;
+};
+
+/**
+ * enum tb_path_port - path options mask
+ * @TB_PATH_NONE: Do not activate on any hop on path
+ * @TB_PATH_SOURCE: Activate on the first hop (out of src)
+ * @TB_PATH_INTERNAL: Activate on the intermediate hops (not the first/last)
+ * @TB_PATH_DESTINATION: Activate on the last hop (into dst)
+ * @TB_PATH_ALL: Activate on all hops on the path
+ */
+enum tb_path_port {
+	TB_PATH_NONE = 0,
+	TB_PATH_SOURCE = 1,
+	TB_PATH_INTERNAL = 2,
+	TB_PATH_DESTINATION = 4,
+	TB_PATH_ALL = 7,
+};
+
+/**
+ * struct tb_path - a unidirectional path between two ports
+ * @tb: Pointer to the domain structure
+ * @name: Name of the path (used for debugging)
+ * @ingress_shared_buffer: Shared buffering used for ingress ports on the path
+ * @egress_shared_buffer: Shared buffering used for egress ports on the path
+ * @ingress_fc_enable: Flow control for ingress ports on the path
+ * @egress_fc_enable: Flow control for egress ports on the path
+ * @priority: Priority group if the path
+ * @weight: Weight of the path inside the priority group
+ * @drop_packages: Drop packages from queue tail or head
+ * @activated: Is the path active
+ * @clear_fc: Clear all flow control from the path config space entries
+ *	      when deactivating this path
+ * @hops: Path hops
+ * @path_length: How many hops the path uses
+ * @alloc_hopid: Does this path consume port HopID
+ *
+ * A path consists of a number of hops (see &struct tb_path_hop). To
+ * establish a PCIe tunnel two paths have to be created between the two
+ * PCIe ports.
+ */
+struct tb_path {
+	struct tb *tb;
+	const char *name;
+	enum tb_path_port ingress_shared_buffer;
+	enum tb_path_port egress_shared_buffer;
+	enum tb_path_port ingress_fc_enable;
+	enum tb_path_port egress_fc_enable;
+
+	unsigned int priority:3;
+	int weight:4;
+	bool drop_packages;
+	bool activated;
+	bool clear_fc;
+	struct tb_path_hop *hops;
+	int path_length;
+	bool alloc_hopid;
+};
+
+/* HopIDs 0-7 are reserved by the Thunderbolt protocol */
+#define TB_PATH_MIN_HOPID	8
+/*
+ * Support paths from the farthest (depth 6) router to the host and back
+ * to the same level (not necessarily to the same router).
+ */
+#define TB_PATH_MAX_HOPS	(7 * 2)
+
+/* Possible wake types */
+#define TB_WAKE_ON_CONNECT	BIT(0)
+#define TB_WAKE_ON_DISCONNECT	BIT(1)
+#define TB_WAKE_ON_USB4		BIT(2)
+#define TB_WAKE_ON_USB3		BIT(3)
+#define TB_WAKE_ON_PCIE		BIT(4)
+#define TB_WAKE_ON_DP		BIT(5)
+
+/* CL states */
+#define TB_CL0S			BIT(0)
+#define TB_CL1			BIT(1)
+#define TB_CL2			BIT(2)
+
+/**
+ * struct tb_cm_ops - Connection manager specific operations vector
+ * @driver_ready: Called right after control channel is started. Used by
+ *		  ICM to send driver ready message to the firmware.
+ * @start: Starts the domain
+ * @stop: Stops the domain
+ * @suspend_noirq: Connection manager specific suspend_noirq
+ * @resume_noirq: Connection manager specific resume_noirq
+ * @suspend: Connection manager specific suspend
+ * @freeze_noirq: Connection manager specific freeze_noirq
+ * @thaw_noirq: Connection manager specific thaw_noirq
+ * @complete: Connection manager specific complete
+ * @runtime_suspend: Connection manager specific runtime_suspend
+ * @runtime_resume: Connection manager specific runtime_resume
+ * @runtime_suspend_switch: Runtime suspend a switch
+ * @runtime_resume_switch: Runtime resume a switch
+ * @handle_event: Handle thunderbolt event
+ * @get_boot_acl: Get boot ACL list
+ * @set_boot_acl: Set boot ACL list
+ * @disapprove_switch: Disapprove switch (disconnect PCIe tunnel)
+ * @approve_switch: Approve switch
+ * @add_switch_key: Add key to switch
+ * @challenge_switch_key: Challenge switch using key
+ * @disconnect_pcie_paths: Disconnects PCIe paths before NVM update
+ * @approve_xdomain_paths: Approve (establish) XDomain DMA paths
+ * @disconnect_xdomain_paths: Disconnect XDomain DMA paths
+ * @usb4_switch_op: Optional proxy for USB4 router operations. If set
+ *		    this will be called whenever USB4 router operation is
+ *		    performed. If this returns %-EOPNOTSUPP then the
+ *		    native USB4 router operation is called.
+ * @usb4_switch_nvm_authenticate_status: Optional callback that the CM
+ *					 implementation can be used to
+ *					 return status of USB4 NVM_AUTH
+ *					 router operation.
+ */
+struct tb_cm_ops {
+	int (*driver_ready)(struct tb *tb);
+	int (*start)(struct tb *tb);
+	void (*stop)(struct tb *tb);
+	int (*suspend_noirq)(struct tb *tb);
+	int (*resume_noirq)(struct tb *tb);
+	int (*suspend)(struct tb *tb);
+	int (*freeze_noirq)(struct tb *tb);
+	int (*thaw_noirq)(struct tb *tb);
+	void (*complete)(struct tb *tb);
+	int (*runtime_suspend)(struct tb *tb);
+	int (*runtime_resume)(struct tb *tb);
+	int (*runtime_suspend_switch)(struct tb_switch *sw);
+	int (*runtime_resume_switch)(struct tb_switch *sw);
+	void (*handle_event)(struct tb *tb, enum tb_cfg_pkg_type,
+			     const void *buf, size_t size);
+	int (*get_boot_acl)(struct tb *tb, uuid_t *uuids, size_t nuuids);
+	int (*set_boot_acl)(struct tb *tb, const uuid_t *uuids, size_t nuuids);
+	int (*disapprove_switch)(struct tb *tb, struct tb_switch *sw);
+	int (*approve_switch)(struct tb *tb, struct tb_switch *sw);
+	int (*add_switch_key)(struct tb *tb, struct tb_switch *sw);
+	int (*challenge_switch_key)(struct tb *tb, struct tb_switch *sw,
+				    const u8 *challenge, u8 *response);
+	int (*disconnect_pcie_paths)(struct tb *tb);
+	int (*approve_xdomain_paths)(struct tb *tb, struct tb_xdomain *xd,
+				     int transmit_path, int transmit_ring,
+				     int receive_path, int receive_ring);
+	int (*disconnect_xdomain_paths)(struct tb *tb, struct tb_xdomain *xd,
+					int transmit_path, int transmit_ring,
+					int receive_path, int receive_ring);
+	int (*usb4_switch_op)(struct tb_switch *sw, u16 opcode, u32 *metadata,
+			      u8 *status, const void *tx_data, size_t tx_data_len,
+			      void *rx_data, size_t rx_data_len);
+	int (*usb4_switch_nvm_authenticate_status)(struct tb_switch *sw,
+						   u32 *status);
+};
+
+static inline void *tb_priv(struct tb *tb)
+{
+	return (void *)tb->privdata;
+}
+
+#define TB_AUTOSUSPEND_DELAY		15000 /* ms */
+
+/* helper functions & macros */
+
+/**
+ * tb_upstream_port() - return the upstream port of a switch
+ *
+ * Every switch has an upstream port (for the root switch it is the NHI).
+ *
+ * During switch alloc/init tb_upstream_port()->remote may be NULL, even for
+ * non root switches (on the NHI port remote is always NULL).
+ *
+ * Return: Returns the upstream port of the switch.
+ */
+static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
+{
+	return &sw->ports[sw->config.upstream_port_number];
+}
+
+/**
+ * tb_is_upstream_port() - Is the port upstream facing
+ * @port: Port to check
+ *
+ * Returns true if @port is upstream facing port. In case of dual link
+ * ports both return true.
+ */
+static inline bool tb_is_upstream_port(const struct tb_port *port)
+{
+	const struct tb_port *upstream_port = tb_upstream_port(port->sw);
+	return port == upstream_port || port->dual_link_port == upstream_port;
+}
+
+static inline u64 tb_route(const struct tb_switch *sw)
+{
+	return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
+}
+
+static inline struct tb_port *tb_port_at(u64 route, struct tb_switch *sw)
+{
+	u8 port;
+
+	port = route >> (sw->config.depth * 8);
+	if (WARN_ON(port > sw->config.max_port_number))
+		return NULL;
+	return &sw->ports[port];
+}
+
+/**
+ * tb_port_has_remote() - Does the port have switch connected downstream
+ * @port: Port to check
+ *
+ * Returns true only when the port is primary port and has remote set.
+ */
+static inline bool tb_port_has_remote(const struct tb_port *port)
+{
+	if (tb_is_upstream_port(port))
+		return false;
+	if (!port->remote)
+		return false;
+	if (port->dual_link_port && port->link_nr)
+		return false;
+
+	return true;
+}
+
+static inline bool tb_port_is_null(const struct tb_port *port)
+{
+	return port && port->port && port->config.type == TB_TYPE_PORT;
+}
+
+static inline bool tb_port_is_nhi(const struct tb_port *port)
+{
+	return port && port->config.type == TB_TYPE_NHI;
+}
+
+static inline bool tb_port_is_pcie_down(const struct tb_port *port)
+{
+	return port && port->config.type == TB_TYPE_PCIE_DOWN;
+}
+
+static inline bool tb_port_is_pcie_up(const struct tb_port *port)
+{
+	return port && port->config.type == TB_TYPE_PCIE_UP;
+}
+
+static inline bool tb_port_is_dpin(const struct tb_port *port)
+{
+	return port && port->config.type == TB_TYPE_DP_HDMI_IN;
+}
+
+static inline bool tb_port_is_dpout(const struct tb_port *port)
+{
+	return port && port->config.type == TB_TYPE_DP_HDMI_OUT;
+}
+
+static inline bool tb_port_is_usb3_down(const struct tb_port *port)
+{
+	return port && port->config.type == TB_TYPE_USB3_DOWN;
+}
+
+static inline bool tb_port_is_usb3_up(const struct tb_port *port)
+{
+	return port && port->config.type == TB_TYPE_USB3_UP;
+}
+
+static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
+			     enum tb_cfg_space space, u32 offset, u32 length)
+{
+	if (sw->is_unplugged)
+		return -ENODEV;
+	return tb_cfg_read(sw->tb->ctl,
+			   buffer,
+			   tb_route(sw),
+			   0,
+			   space,
+			   offset,
+			   length);
+}
+
+static inline int tb_sw_write(struct tb_switch *sw, const void *buffer,
+			      enum tb_cfg_space space, u32 offset, u32 length)
+{
+	if (sw->is_unplugged)
+		return -ENODEV;
+	return tb_cfg_write(sw->tb->ctl,
+			    buffer,
+			    tb_route(sw),
+			    0,
+			    space,
+			    offset,
+			    length);
+}
+
+static inline int tb_port_read(struct tb_port *port, void *buffer,
+			       enum tb_cfg_space space, u32 offset, u32 length)
+{
+	if (port->sw->is_unplugged)
+		return -ENODEV;
+	return tb_cfg_read(port->sw->tb->ctl,
+			   buffer,
+			   tb_route(port->sw),
+			   port->port,
+			   space,
+			   offset,
+			   length);
+}
+
+static inline int tb_port_write(struct tb_port *port, const void *buffer,
+				enum tb_cfg_space space, u32 offset, u32 length)
+{
+	if (port->sw->is_unplugged)
+		return -ENODEV;
+	return tb_cfg_write(port->sw->tb->ctl,
+			    buffer,
+			    tb_route(port->sw),
+			    port->port,
+			    space,
+			    offset,
+			    length);
+}
+
+#define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
+#define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
+#define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
+#define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
+#define tb_dbg(tb, fmt, arg...) dev_dbg(&(tb)->nhi->pdev->dev, fmt, ## arg)
+
+#define __TB_SW_PRINT(level, sw, fmt, arg...)           \
+	do {                                            \
+		const struct tb_switch *__sw = (sw);    \
+		level(__sw->tb, "%llx: " fmt,           \
+		      tb_route(__sw), ## arg);          \
+	} while (0)
+#define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
+#define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
+#define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
+#define tb_sw_dbg(sw, fmt, arg...) __TB_SW_PRINT(tb_dbg, sw, fmt, ##arg)
+
+#define __TB_PORT_PRINT(level, _port, fmt, arg...)                      \
+	do {                                                            \
+		const struct tb_port *__port = (_port);                 \
+		level(__port->sw->tb, "%llx:%u: " fmt,                  \
+		      tb_route(__port->sw), __port->port, ## arg);      \
+	} while (0)
+#define tb_port_WARN(port, fmt, arg...) \
+	__TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
+#define tb_port_warn(port, fmt, arg...) \
+	__TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
+#define tb_port_info(port, fmt, arg...) \
+	__TB_PORT_PRINT(tb_info, port, fmt, ##arg)
+#define tb_port_dbg(port, fmt, arg...) \
+	__TB_PORT_PRINT(tb_dbg, port, fmt, ##arg)
+
+struct tb *icm_probe(struct tb_nhi *nhi);
+struct tb *tb_probe(struct tb_nhi *nhi);
+
+extern struct device_type tb_domain_type;
+extern struct device_type tb_retimer_type;
+extern struct device_type tb_switch_type;
+extern struct device_type usb4_port_device_type;
+
+int tb_domain_init(void);
+void tb_domain_exit(void);
+int tb_xdomain_init(void);
+void tb_xdomain_exit(void);
+
+struct tb *tb_domain_alloc(struct tb_nhi *nhi, int timeout_msec, size_t privsize);
+int tb_domain_add(struct tb *tb);
+void tb_domain_remove(struct tb *tb);
+int tb_domain_suspend_noirq(struct tb *tb);
+int tb_domain_resume_noirq(struct tb *tb);
+int tb_domain_suspend(struct tb *tb);
+int tb_domain_freeze_noirq(struct tb *tb);
+int tb_domain_thaw_noirq(struct tb *tb);
+void tb_domain_complete(struct tb *tb);
+int tb_domain_runtime_suspend(struct tb *tb);
+int tb_domain_runtime_resume(struct tb *tb);
+int tb_domain_disapprove_switch(struct tb *tb, struct tb_switch *sw);
+int tb_domain_approve_switch(struct tb *tb, struct tb_switch *sw);
+int tb_domain_approve_switch_key(struct tb *tb, struct tb_switch *sw);
+int tb_domain_challenge_switch_key(struct tb *tb, struct tb_switch *sw);
+int tb_domain_disconnect_pcie_paths(struct tb *tb);
+int tb_domain_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
+				    int transmit_path, int transmit_ring,
+				    int receive_path, int receive_ring);
+int tb_domain_disconnect_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
+				       int transmit_path, int transmit_ring,
+				       int receive_path, int receive_ring);
+int tb_domain_disconnect_all_paths(struct tb *tb);
+
+static inline struct tb *tb_domain_get(struct tb *tb)
+{
+	if (tb)
+		get_device(&tb->dev);
+	return tb;
+}
+
+static inline void tb_domain_put(struct tb *tb)
+{
+	put_device(&tb->dev);
+}
+
+struct tb_nvm *tb_nvm_alloc(struct device *dev);
+int tb_nvm_read_version(struct tb_nvm *nvm);
+int tb_nvm_validate(struct tb_nvm *nvm);
+int tb_nvm_write_headers(struct tb_nvm *nvm);
+int tb_nvm_add_active(struct tb_nvm *nvm, nvmem_reg_read_t reg_read);
+int tb_nvm_write_buf(struct tb_nvm *nvm, unsigned int offset, void *val,
+		     size_t bytes);
+int tb_nvm_add_non_active(struct tb_nvm *nvm, nvmem_reg_write_t reg_write);
+void tb_nvm_free(struct tb_nvm *nvm);
+void tb_nvm_exit(void);
+
+typedef int (*read_block_fn)(void *, unsigned int, void *, size_t);
+typedef int (*write_block_fn)(void *, unsigned int, const void *, size_t);
+
+int tb_nvm_read_data(unsigned int address, void *buf, size_t size,
+		     unsigned int retries, read_block_fn read_block,
+		     void *read_block_data);
+int tb_nvm_write_data(unsigned int address, const void *buf, size_t size,
+		      unsigned int retries, write_block_fn write_next_block,
+		      void *write_block_data);
+
+int tb_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
+		       size_t size);
+struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
+				  u64 route);
+struct tb_switch *tb_switch_alloc_safe_mode(struct tb *tb,
+			struct device *parent, u64 route);
+int tb_switch_configure(struct tb_switch *sw);
+int tb_switch_configuration_valid(struct tb_switch *sw);
+int tb_switch_add(struct tb_switch *sw);
+void tb_switch_remove(struct tb_switch *sw);
+void tb_switch_suspend(struct tb_switch *sw, bool runtime);
+int tb_switch_resume(struct tb_switch *sw);
+int tb_switch_reset(struct tb_switch *sw);
+int tb_switch_wait_for_bit(struct tb_switch *sw, u32 offset, u32 bit,
+			   u32 value, int timeout_msec);
+void tb_sw_set_unplugged(struct tb_switch *sw);
+struct tb_port *tb_switch_find_port(struct tb_switch *sw,
+				    enum tb_port_type type);
+struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link,
+					       u8 depth);
+struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid);
+struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route);
+
+/**
+ * tb_switch_for_each_port() - Iterate over each switch port
+ * @sw: Switch whose ports to iterate
+ * @p: Port used as iterator
+ *
+ * Iterates over each switch port skipping the control port (port %0).
+ */
+#define tb_switch_for_each_port(sw, p)					\
+	for ((p) = &(sw)->ports[1];					\
+	     (p) <= &(sw)->ports[(sw)->config.max_port_number]; (p)++)
+
+static inline struct tb_switch *tb_switch_get(struct tb_switch *sw)
+{
+	if (sw)
+		get_device(&sw->dev);
+	return sw;
+}
+
+static inline void tb_switch_put(struct tb_switch *sw)
+{
+	put_device(&sw->dev);
+}
+
+static inline bool tb_is_switch(const struct device *dev)
+{
+	return dev->type == &tb_switch_type;
+}
+
+static inline struct tb_switch *tb_to_switch(const struct device *dev)
+{
+	if (tb_is_switch(dev))
+		return container_of(dev, struct tb_switch, dev);
+	return NULL;
+}
+
+static inline struct tb_switch *tb_switch_parent(struct tb_switch *sw)
+{
+	return tb_to_switch(sw->dev.parent);
+}
+
+/**
+ * tb_switch_downstream_port() - Return downstream facing port of parent router
+ * @sw: Device router pointer
+ *
+ * Only call for device routers. Returns the downstream facing port of
+ * the parent router.
+ */
+static inline struct tb_port *tb_switch_downstream_port(struct tb_switch *sw)
+{
+	if (WARN_ON(!tb_route(sw)))
+		return NULL;
+	return tb_port_at(tb_route(sw), tb_switch_parent(sw));
+}
+
+static inline bool tb_switch_is_light_ridge(const struct tb_switch *sw)
+{
+	return sw->config.vendor_id == PCI_VENDOR_ID_INTEL &&
+	       sw->config.device_id == PCI_DEVICE_ID_INTEL_LIGHT_RIDGE;
+}
+
+static inline bool tb_switch_is_eagle_ridge(const struct tb_switch *sw)
+{
+	return sw->config.vendor_id == PCI_VENDOR_ID_INTEL &&
+	       sw->config.device_id == PCI_DEVICE_ID_INTEL_EAGLE_RIDGE;
+}
+
+static inline bool tb_switch_is_cactus_ridge(const struct tb_switch *sw)
+{
+	if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
+		switch (sw->config.device_id) {
+		case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
+		case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
+			return true;
+		}
+	}
+	return false;
+}
+
+static inline bool tb_switch_is_falcon_ridge(const struct tb_switch *sw)
+{
+	if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
+		switch (sw->config.device_id) {
+		case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
+		case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
+			return true;
+		}
+	}
+	return false;
+}
+
+static inline bool tb_switch_is_alpine_ridge(const struct tb_switch *sw)
+{
+	if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
+		switch (sw->config.device_id) {
+		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
+		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
+		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
+		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
+		case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
+			return true;
+		}
+	}
+	return false;
+}
+
+static inline bool tb_switch_is_titan_ridge(const struct tb_switch *sw)
+{
+	if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
+		switch (sw->config.device_id) {
+		case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
+		case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
+		case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
+			return true;
+		}
+	}
+	return false;
+}
+
+static inline bool tb_switch_is_tiger_lake(const struct tb_switch *sw)
+{
+	if (sw->config.vendor_id == PCI_VENDOR_ID_INTEL) {
+		switch (sw->config.device_id) {
+		case PCI_DEVICE_ID_INTEL_TGL_NHI0:
+		case PCI_DEVICE_ID_INTEL_TGL_NHI1:
+		case PCI_DEVICE_ID_INTEL_TGL_H_NHI0:
+		case PCI_DEVICE_ID_INTEL_TGL_H_NHI1:
+			return true;
+		}
+	}
+	return false;
+}
+
+/**
+ * tb_switch_is_icm() - Is the switch handled by ICM firmware
+ * @sw: Switch to check
+ *
+ * In case there is a need to differentiate whether ICM firmware or SW CM
+ * is handling @sw this function can be called. It is valid to call this
+ * after tb_switch_alloc() and tb_switch_configure() has been called
+ * (latter only for SW CM case).
+ */
+static inline bool tb_switch_is_icm(const struct tb_switch *sw)
+{
+	return !sw->config.enabled;
+}
+
+int tb_switch_lane_bonding_enable(struct tb_switch *sw);
+void tb_switch_lane_bonding_disable(struct tb_switch *sw);
+int tb_switch_configure_link(struct tb_switch *sw);
+void tb_switch_unconfigure_link(struct tb_switch *sw);
+
+bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in);
+int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
+void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
+
+int tb_switch_tmu_init(struct tb_switch *sw);
+int tb_switch_tmu_post_time(struct tb_switch *sw);
+int tb_switch_tmu_disable(struct tb_switch *sw);
+int tb_switch_tmu_enable(struct tb_switch *sw);
+int tb_switch_tmu_configure(struct tb_switch *sw, enum tb_switch_tmu_mode mode);
+
+/**
+ * tb_switch_tmu_is_configured() - Is given TMU mode configured
+ * @sw: Router whose mode to check
+ * @mode: Mode to check
+ *
+ * Checks if given router TMU mode is configured to @mode. Note the
+ * router TMU might not be enabled to this mode.
+ */
+static inline bool tb_switch_tmu_is_configured(const struct tb_switch *sw,
+					       enum tb_switch_tmu_mode mode)
+{
+	return sw->tmu.mode_request == mode;
+}
+
+/**
+ * tb_switch_tmu_is_enabled() - Checks if the specified TMU mode is enabled
+ * @sw: Router whose TMU mode to check
+ *
+ * Return true if hardware TMU configuration matches the requested
+ * configuration (and is not %TB_SWITCH_TMU_MODE_OFF).
+ */
+static inline bool tb_switch_tmu_is_enabled(const struct tb_switch *sw)
+{
+	return sw->tmu.mode != TB_SWITCH_TMU_MODE_OFF &&
+	       sw->tmu.mode == sw->tmu.mode_request;
+}
+
+bool tb_port_clx_is_enabled(struct tb_port *port, unsigned int clx);
+
+int tb_switch_clx_init(struct tb_switch *sw);
+bool tb_switch_clx_is_supported(const struct tb_switch *sw);
+int tb_switch_clx_enable(struct tb_switch *sw, unsigned int clx);
+int tb_switch_clx_disable(struct tb_switch *sw);
+
+/**
+ * tb_switch_clx_is_enabled() - Checks if the CLx is enabled
+ * @sw: Router to check for the CLx
+ * @clx: The CLx states to check for
+ *
+ * Checks if the specified CLx is enabled on the router upstream link.
+ * Returns true if any of the given states is enabled.
+ *
+ * Not applicable for a host router.
+ */
+static inline bool tb_switch_clx_is_enabled(const struct tb_switch *sw,
+					    unsigned int clx)
+{
+	return sw->clx & clx;
+}
+
+int tb_switch_pcie_l1_enable(struct tb_switch *sw);
+
+int tb_switch_xhci_connect(struct tb_switch *sw);
+void tb_switch_xhci_disconnect(struct tb_switch *sw);
+
+int tb_port_state(struct tb_port *port);
+int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged);
+int tb_port_add_nfc_credits(struct tb_port *port, int credits);
+int tb_port_clear_counter(struct tb_port *port, int counter);
+int tb_port_unlock(struct tb_port *port);
+int tb_port_enable(struct tb_port *port);
+int tb_port_disable(struct tb_port *port);
+int tb_port_alloc_in_hopid(struct tb_port *port, int hopid, int max_hopid);
+void tb_port_release_in_hopid(struct tb_port *port, int hopid);
+int tb_port_alloc_out_hopid(struct tb_port *port, int hopid, int max_hopid);
+void tb_port_release_out_hopid(struct tb_port *port, int hopid);
+struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
+				     struct tb_port *prev);
+
+static inline bool tb_port_use_credit_allocation(const struct tb_port *port)
+{
+	return tb_port_is_null(port) && port->sw->credit_allocation;
+}
+
+/**
+ * tb_for_each_port_on_path() - Iterate over each port on path
+ * @src: Source port
+ * @dst: Destination port
+ * @p: Port used as iterator
+ *
+ * Walks over each port on path from @src to @dst.
+ */
+#define tb_for_each_port_on_path(src, dst, p)				\
+	for ((p) = tb_next_port_on_path((src), (dst), NULL); (p);	\
+	     (p) = tb_next_port_on_path((src), (dst), (p)))
+
+int tb_port_get_link_speed(struct tb_port *port);
+int tb_port_get_link_width(struct tb_port *port);
+int tb_port_set_link_width(struct tb_port *port, enum tb_link_width width);
+int tb_port_lane_bonding_enable(struct tb_port *port);
+void tb_port_lane_bonding_disable(struct tb_port *port);
+int tb_port_wait_for_link_width(struct tb_port *port, unsigned int width_mask,
+				int timeout_msec);
+int tb_port_update_credits(struct tb_port *port);
+
+int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
+int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap);
+int tb_switch_next_cap(struct tb_switch *sw, unsigned int offset);
+int tb_port_find_cap(struct tb_port *port, enum tb_port_cap cap);
+int tb_port_next_cap(struct tb_port *port, unsigned int offset);
+bool tb_port_is_enabled(struct tb_port *port);
+
+bool tb_usb3_port_is_enabled(struct tb_port *port);
+int tb_usb3_port_enable(struct tb_port *port, bool enable);
+
+bool tb_pci_port_is_enabled(struct tb_port *port);
+int tb_pci_port_enable(struct tb_port *port, bool enable);
+
+int tb_dp_port_hpd_is_active(struct tb_port *port);
+int tb_dp_port_hpd_clear(struct tb_port *port);
+int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
+			unsigned int aux_tx, unsigned int aux_rx);
+bool tb_dp_port_is_enabled(struct tb_port *port);
+int tb_dp_port_enable(struct tb_port *port, bool enable);
+
+struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
+				 struct tb_port *dst, int dst_hopid,
+				 struct tb_port **last, const char *name,
+				 bool alloc_hopid);
+struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
+			      struct tb_port *dst, int dst_hopid, int link_nr,
+			      const char *name);
+void tb_path_free(struct tb_path *path);
+int tb_path_activate(struct tb_path *path);
+void tb_path_deactivate(struct tb_path *path);
+bool tb_path_is_invalid(struct tb_path *path);
+bool tb_path_port_on_path(const struct tb_path *path,
+			  const struct tb_port *port);
+
+/**
+ * tb_path_for_each_hop() - Iterate over each hop on path
+ * @path: Path whose hops to iterate
+ * @hop: Hop used as iterator
+ *
+ * Iterates over each hop on path.
+ */
+#define tb_path_for_each_hop(path, hop)					\
+	for ((hop) = &(path)->hops[0];					\
+	     (hop) <= &(path)->hops[(path)->path_length - 1]; (hop)++)
+
+int tb_drom_read(struct tb_switch *sw);
+int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
+
+int tb_lc_read_uuid(struct tb_switch *sw, u32 *uuid);
+int tb_lc_configure_port(struct tb_port *port);
+void tb_lc_unconfigure_port(struct tb_port *port);
+int tb_lc_configure_xdomain(struct tb_port *port);
+void tb_lc_unconfigure_xdomain(struct tb_port *port);
+int tb_lc_start_lane_initialization(struct tb_port *port);
+bool tb_lc_is_clx_supported(struct tb_port *port);
+bool tb_lc_is_usb_plugged(struct tb_port *port);
+bool tb_lc_is_xhci_connected(struct tb_port *port);
+int tb_lc_xhci_connect(struct tb_port *port);
+void tb_lc_xhci_disconnect(struct tb_port *port);
+int tb_lc_set_wake(struct tb_switch *sw, unsigned int flags);
+int tb_lc_set_sleep(struct tb_switch *sw);
+bool tb_lc_lane_bonding_possible(struct tb_switch *sw);
+bool tb_lc_dp_sink_query(struct tb_switch *sw, struct tb_port *in);
+int tb_lc_dp_sink_alloc(struct tb_switch *sw, struct tb_port *in);
+int tb_lc_dp_sink_dealloc(struct tb_switch *sw, struct tb_port *in);
+int tb_lc_force_power(struct tb_switch *sw);
+
+static inline int tb_route_length(u64 route)
+{
+	return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
+}
+
+/**
+ * tb_downstream_route() - get route to downstream switch
+ *
+ * Port must not be the upstream port (otherwise a loop is created).
+ *
+ * Return: Returns a route to the switch behind @port.
+ */
+static inline u64 tb_downstream_route(struct tb_port *port)
+{
+	return tb_route(port->sw)
+	       | ((u64) port->port << (port->sw->config.depth * 8));
+}
+
+bool tb_is_xdomain_enabled(void);
+bool tb_xdomain_handle_request(struct tb *tb, enum tb_cfg_pkg_type type,
+			       const void *buf, size_t size);
+struct tb_xdomain *tb_xdomain_alloc(struct tb *tb, struct device *parent,
+				    u64 route, const uuid_t *local_uuid,
+				    const uuid_t *remote_uuid);
+void tb_xdomain_add(struct tb_xdomain *xd);
+void tb_xdomain_remove(struct tb_xdomain *xd);
+struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link,
+						 u8 depth);
+
+static inline struct tb_switch *tb_xdomain_parent(struct tb_xdomain *xd)
+{
+	return tb_to_switch(xd->dev.parent);
+}
+
+/**
+ * tb_xdomain_downstream_port() - Return downstream facing port of parent router
+ * @xd: Xdomain pointer
+ *
+ * Returns the downstream port the XDomain is connected to.
+ */
+static inline struct tb_port *tb_xdomain_downstream_port(struct tb_xdomain *xd)
+{
+	return tb_port_at(xd->route, tb_xdomain_parent(xd));
+}
+
+int tb_retimer_nvm_read(struct tb_retimer *rt, unsigned int address, void *buf,
+			size_t size);
+int tb_retimer_scan(struct tb_port *port, bool add);
+void tb_retimer_remove_all(struct tb_port *port);
+
+static inline bool tb_is_retimer(const struct device *dev)
+{
+	return dev->type == &tb_retimer_type;
+}
+
+static inline struct tb_retimer *tb_to_retimer(struct device *dev)
+{
+	if (tb_is_retimer(dev))
+		return container_of(dev, struct tb_retimer, dev);
+	return NULL;
+}
+
+/**
+ * usb4_switch_version() - Returns USB4 version of the router
+ * @sw: Router to check
+ *
+ * Returns major version of USB4 router (%1 for v1, %2 for v2 and so
+ * on). Can be called to pre-USB4 router too and in that case returns %0.
+ */
+static inline unsigned int usb4_switch_version(const struct tb_switch *sw)
+{
+	return FIELD_GET(USB4_VERSION_MAJOR_MASK, sw->config.thunderbolt_version);
+}
+
+/**
+ * tb_switch_is_usb4() - Is the switch USB4 compliant
+ * @sw: Switch to check
+ *
+ * Returns true if the @sw is USB4 compliant router, false otherwise.
+ */
+static inline bool tb_switch_is_usb4(const struct tb_switch *sw)
+{
+	return usb4_switch_version(sw) > 0;
+}
+
+int usb4_switch_setup(struct tb_switch *sw);
+int usb4_switch_configuration_valid(struct tb_switch *sw);
+int usb4_switch_read_uid(struct tb_switch *sw, u64 *uid);
+int usb4_switch_drom_read(struct tb_switch *sw, unsigned int address, void *buf,
+			  size_t size);
+bool usb4_switch_lane_bonding_possible(struct tb_switch *sw);
+int usb4_switch_set_wake(struct tb_switch *sw, unsigned int flags);
+int usb4_switch_set_sleep(struct tb_switch *sw);
+int usb4_switch_nvm_sector_size(struct tb_switch *sw);
+int usb4_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
+			 size_t size);
+int usb4_switch_nvm_set_offset(struct tb_switch *sw, unsigned int address);
+int usb4_switch_nvm_write(struct tb_switch *sw, unsigned int address,
+			  const void *buf, size_t size);
+int usb4_switch_nvm_authenticate(struct tb_switch *sw);
+int usb4_switch_nvm_authenticate_status(struct tb_switch *sw, u32 *status);
+int usb4_switch_credits_init(struct tb_switch *sw);
+bool usb4_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in);
+int usb4_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
+int usb4_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in);
+struct tb_port *usb4_switch_map_pcie_down(struct tb_switch *sw,
+					  const struct tb_port *port);
+struct tb_port *usb4_switch_map_usb3_down(struct tb_switch *sw,
+					  const struct tb_port *port);
+int usb4_switch_add_ports(struct tb_switch *sw);
+void usb4_switch_remove_ports(struct tb_switch *sw);
+
+int usb4_port_unlock(struct tb_port *port);
+int usb4_port_hotplug_enable(struct tb_port *port);
+int usb4_port_configure(struct tb_port *port);
+void usb4_port_unconfigure(struct tb_port *port);
+int usb4_port_configure_xdomain(struct tb_port *port, struct tb_xdomain *xd);
+void usb4_port_unconfigure_xdomain(struct tb_port *port);
+int usb4_port_router_offline(struct tb_port *port);
+int usb4_port_router_online(struct tb_port *port);
+int usb4_port_enumerate_retimers(struct tb_port *port);
+bool usb4_port_clx_supported(struct tb_port *port);
+int usb4_port_margining_caps(struct tb_port *port, u32 *caps);
+int usb4_port_hw_margin(struct tb_port *port, unsigned int lanes,
+			unsigned int ber_level, bool timing, bool right_high,
+			u32 *results);
+int usb4_port_sw_margin(struct tb_port *port, unsigned int lanes, bool timing,
+			bool right_high, u32 counter);
+int usb4_port_sw_margin_errors(struct tb_port *port, u32 *errors);
+
+int usb4_port_retimer_set_inbound_sbtx(struct tb_port *port, u8 index);
+int usb4_port_retimer_unset_inbound_sbtx(struct tb_port *port, u8 index);
+int usb4_port_retimer_read(struct tb_port *port, u8 index, u8 reg, void *buf,
+			   u8 size);
+int usb4_port_retimer_write(struct tb_port *port, u8 index, u8 reg,
+			    const void *buf, u8 size);
+int usb4_port_retimer_is_last(struct tb_port *port, u8 index);
+int usb4_port_retimer_nvm_sector_size(struct tb_port *port, u8 index);
+int usb4_port_retimer_nvm_set_offset(struct tb_port *port, u8 index,
+				     unsigned int address);
+int usb4_port_retimer_nvm_write(struct tb_port *port, u8 index,
+				unsigned int address, const void *buf,
+				size_t size);
+int usb4_port_retimer_nvm_authenticate(struct tb_port *port, u8 index);
+int usb4_port_retimer_nvm_authenticate_status(struct tb_port *port, u8 index,
+					      u32 *status);
+int usb4_port_retimer_nvm_read(struct tb_port *port, u8 index,
+			       unsigned int address, void *buf, size_t size);
+
+int usb4_usb3_port_max_link_rate(struct tb_port *port);
+int usb4_usb3_port_actual_link_rate(struct tb_port *port);
+int usb4_usb3_port_allocated_bandwidth(struct tb_port *port, int *upstream_bw,
+				       int *downstream_bw);
+int usb4_usb3_port_allocate_bandwidth(struct tb_port *port, int *upstream_bw,
+				      int *downstream_bw);
+int usb4_usb3_port_release_bandwidth(struct tb_port *port, int *upstream_bw,
+				     int *downstream_bw);
+
+int usb4_dp_port_set_cm_id(struct tb_port *port, int cm_id);
+bool usb4_dp_port_bandwidth_mode_supported(struct tb_port *port);
+bool usb4_dp_port_bandwidth_mode_enabled(struct tb_port *port);
+int usb4_dp_port_set_cm_bandwidth_mode_supported(struct tb_port *port,
+						 bool supported);
+int usb4_dp_port_group_id(struct tb_port *port);
+int usb4_dp_port_set_group_id(struct tb_port *port, int group_id);
+int usb4_dp_port_nrd(struct tb_port *port, int *rate, int *lanes);
+int usb4_dp_port_set_nrd(struct tb_port *port, int rate, int lanes);
+int usb4_dp_port_granularity(struct tb_port *port);
+int usb4_dp_port_set_granularity(struct tb_port *port, int granularity);
+int usb4_dp_port_set_estimated_bandwidth(struct tb_port *port, int bw);
+int usb4_dp_port_allocated_bandwidth(struct tb_port *port);
+int usb4_dp_port_allocate_bandwidth(struct tb_port *port, int bw);
+int usb4_dp_port_requested_bandwidth(struct tb_port *port);
+
+int usb4_pci_port_set_ext_encapsulation(struct tb_port *port, bool enable);
+
+static inline bool tb_is_usb4_port_device(const struct device *dev)
+{
+	return dev->type == &usb4_port_device_type;
+}
+
+static inline struct usb4_port *tb_to_usb4_port_device(struct device *dev)
+{
+	if (tb_is_usb4_port_device(dev))
+		return container_of(dev, struct usb4_port, dev);
+	return NULL;
+}
+
+struct usb4_port *usb4_port_device_add(struct tb_port *port);
+void usb4_port_device_remove(struct usb4_port *usb4);
+int usb4_port_device_resume(struct usb4_port *usb4);
+
+static inline bool usb4_port_device_is_offline(const struct usb4_port *usb4)
+{
+	return usb4->offline;
+}
+
+void tb_check_quirks(struct tb_switch *sw);
+
+#ifdef CONFIG_ACPI
+bool tb_acpi_add_links(struct tb_nhi *nhi);
+
+bool tb_acpi_is_native(void);
+bool tb_acpi_may_tunnel_usb3(void);
+bool tb_acpi_may_tunnel_dp(void);
+bool tb_acpi_may_tunnel_pcie(void);
+bool tb_acpi_is_xdomain_allowed(void);
+
+int tb_acpi_init(void);
+void tb_acpi_exit(void);
+int tb_acpi_power_on_retimers(struct tb_port *port);
+int tb_acpi_power_off_retimers(struct tb_port *port);
+#else
+static inline bool tb_acpi_add_links(struct tb_nhi *nhi) { return false; }
+
+static inline bool tb_acpi_is_native(void) { return true; }
+static inline bool tb_acpi_may_tunnel_usb3(void) { return true; }
+static inline bool tb_acpi_may_tunnel_dp(void) { return true; }
+static inline bool tb_acpi_may_tunnel_pcie(void) { return true; }
+static inline bool tb_acpi_is_xdomain_allowed(void) { return true; }
+
+static inline int tb_acpi_init(void) { return 0; }
+static inline void tb_acpi_exit(void) { }
+static inline int tb_acpi_power_on_retimers(struct tb_port *port) { return 0; }
+static inline int tb_acpi_power_off_retimers(struct tb_port *port) { return 0; }
+#endif
+
+#ifdef CONFIG_DEBUG_FS
+void tb_debugfs_init(void);
+void tb_debugfs_exit(void);
+void tb_switch_debugfs_init(struct tb_switch *sw);
+void tb_switch_debugfs_remove(struct tb_switch *sw);
+void tb_xdomain_debugfs_init(struct tb_xdomain *xd);
+void tb_xdomain_debugfs_remove(struct tb_xdomain *xd);
+void tb_service_debugfs_init(struct tb_service *svc);
+void tb_service_debugfs_remove(struct tb_service *svc);
+#else
+static inline void tb_debugfs_init(void) { }
+static inline void tb_debugfs_exit(void) { }
+static inline void tb_switch_debugfs_init(struct tb_switch *sw) { }
+static inline void tb_switch_debugfs_remove(struct tb_switch *sw) { }
+static inline void tb_xdomain_debugfs_init(struct tb_xdomain *xd) { }
+static inline void tb_xdomain_debugfs_remove(struct tb_xdomain *xd) { }
+static inline void tb_service_debugfs_init(struct tb_service *svc) { }
+static inline void tb_service_debugfs_remove(struct tb_service *svc) { }
+#endif
+
+#endif