diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt
index 82e80de78dd0..bd504ed323e8 100644
--- a/Documentation/ABI/testing/sysfs-bus-thunderbolt
+++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt
@@ -236,3 +236,36 @@ KernelVersion: 4.15
Contact: thunderbolt-software@lists.01.org
Description: This contains XDomain service specific settings as
bitmask. Format: %x
+
+What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/device
+Date: Oct 2020
+KernelVersion: v5.9
+Contact: Mika Westerberg <mika.westerberg@linux.intel.com>
+Description: Retimer device identifier read from the hardware.
+
+What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/nvm_authenticate
+Date: Oct 2020
+KernelVersion: v5.9
+Contact: Mika Westerberg <mika.westerberg@linux.intel.com>
+Description: When new NVM image is written to the non-active NVM
+ area (through non_activeX NVMem device), the
+ authentication procedure is started by writing 1 to
+ this file. If everything goes well, the device is
+ restarted with the new NVM firmware. If the image
+ verification fails an error code is returned instead.
+
+ When read holds status of the last authentication
+ operation if an error occurred during the process.
+ Format: %x.
+
+What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/nvm_version
+Date: Oct 2020
+KernelVersion: v5.9
+Contact: Mika Westerberg <mika.westerberg@linux.intel.com>
+Description: Holds retimer NVM version number. Format: %x.%x, major.minor.
+
+What: /sys/bus/thunderbolt/devices/<device>:<port>.<index>/vendor
+Date: Oct 2020
+KernelVersion: v5.9
+Contact: Mika Westerberg <mika.westerberg@linux.intel.com>
+Description: Retimer vendor identifier read from the hardware.
diff --git a/Documentation/admin-guide/thunderbolt.rst b/Documentation/admin-guide/thunderbolt.rst
index 10c4f0ce2ad0..613cb24c76c7 100644
--- a/Documentation/admin-guide/thunderbolt.rst
+++ b/Documentation/admin-guide/thunderbolt.rst
@@ -173,8 +173,8 @@ following ``udev`` rule::
ACTION=="add", SUBSYSTEM=="thunderbolt", ATTRS{iommu_dma_protection}=="1", ATTR{authorized}=="0", ATTR{authorized}="1"
-Upgrading NVM on Thunderbolt device or host
--------------------------------------------
+Upgrading NVM on Thunderbolt device, host or retimer
+----------------------------------------------------
Since most of the functionality is handled in firmware running on a
host controller or a device, it is important that the firmware can be
upgraded to the latest where possible bugs in it have been fixed.
@@ -185,9 +185,10 @@ for some machines:
`Thunderbolt Updates <https://thunderbolttechnology.net/updates>`_
-Before you upgrade firmware on a device or host, please make sure it is a
-suitable upgrade. Failing to do that may render the device (or host) in a
-state where it cannot be used properly anymore without special tools!
+Before you upgrade firmware on a device, host or retimer, please make
+sure it is a suitable upgrade. Failing to do that may render the device
+in a state where it cannot be used properly anymore without special
+tools!
Host NVM upgrade on Apple Macs is not supported.
diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile
index 7ee257cee7ff..cf7e1b42f4ad 100644
--- a/drivers/thunderbolt/Makefile
+++ b/drivers/thunderbolt/Makefile
@@ -2,6 +2,6 @@
obj-${CONFIG_USB4} := thunderbolt.o
thunderbolt-objs := nhi.o nhi_ops.o ctl.o tb.o switch.o cap.o path.o tunnel.o eeprom.o
thunderbolt-objs += domain.o dma_port.o icm.o property.o xdomain.o lc.o tmu.o usb4.o
-thunderbolt-objs += nvm.o
+thunderbolt-objs += nvm.o retimer.o
obj-${CONFIG_USB4_KUNIT_TEST} += test.o
diff --git a/drivers/thunderbolt/retimer.c b/drivers/thunderbolt/retimer.c
new file mode 100644
index 000000000000..620bcf586ee2
--- /dev/null
+++ b/drivers/thunderbolt/retimer.c
@@ -0,0 +1,485 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Thunderbolt/USB4 retimer support.
+ *
+ * Copyright (C) 2020, Intel Corporation
+ * Authors: Kranthi Kuntala <kranthi.kuntala@intel.com>
+ * Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/pm_runtime.h>
+#include <linux/sched/signal.h>
+
+#include "sb_regs.h"
+#include "tb.h"
+
+#define TB_MAX_RETIMER_INDEX 6
+
+static int tb_retimer_nvm_read(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct tb_nvm *nvm = priv;
+ struct tb_retimer *rt = tb_to_retimer(nvm->dev);
+ int ret;
+
+ pm_runtime_get_sync(&rt->dev);
+
+ if (!mutex_trylock(&rt->tb->lock)) {
+ ret = restart_syscall();
+ goto out;
+ }
+
+ ret = usb4_port_retimer_nvm_read(rt->port, rt->index, offset, val, bytes);
+ mutex_unlock(&rt->tb->lock);
+
+out:
+ pm_runtime_mark_last_busy(&rt->dev);
+ pm_runtime_put_autosuspend(&rt->dev);
+
+ return ret;
+}
+
+static int tb_retimer_nvm_write(void *priv, unsigned int offset, void *val,
+ size_t bytes)
+{
+ struct tb_nvm *nvm = priv;
+ struct tb_retimer *rt = tb_to_retimer(nvm->dev);
+ int ret = 0;
+
+ if (!mutex_trylock(&rt->tb->lock))
+ return restart_syscall();
+
+ ret = tb_nvm_write_buf(nvm, offset, val, bytes);
+ mutex_unlock(&rt->tb->lock);
+
+ return ret;
+}
+
+static int tb_retimer_nvm_add(struct tb_retimer *rt)
+{
+ struct tb_nvm *nvm;
+ u32 val, nvm_size;
+ int ret;
+
+ nvm = tb_nvm_alloc(&rt->dev);
+ if (IS_ERR(nvm))
+ return PTR_ERR(nvm);
+
+ ret = usb4_port_retimer_nvm_read(rt->port, rt->index, NVM_VERSION, &val,
+ sizeof(val));
+ if (ret)
+ goto err_nvm;
+
+ nvm->major = val >> 16;
+ nvm->minor = val >> 8;
+
+ ret = usb4_port_retimer_nvm_read(rt->port, rt->index, NVM_FLASH_SIZE,
+ &val, sizeof(val));
+ if (ret)
+ goto err_nvm;
+
+ nvm_size = (SZ_1M << (val & 7)) / 8;
+ nvm_size = (nvm_size - SZ_16K) / 2;
+
+ ret = tb_nvm_add_active(nvm, nvm_size, tb_retimer_nvm_read);
+ if (ret)
+ goto err_nvm;
+
+ ret = tb_nvm_add_non_active(nvm, NVM_MAX_SIZE, tb_retimer_nvm_write);
+ if (ret)
+ goto err_nvm;
+
+ rt->nvm = nvm;
+ return 0;
+
+err_nvm:
+ tb_nvm_free(nvm);
+ return ret;
+}
+
+static int tb_retimer_nvm_validate_and_write(struct tb_retimer *rt)
+{
+ unsigned int image_size, hdr_size;
+ const u8 *buf = rt->nvm->buf;
+ u16 ds_size, device;
+
+ image_size = rt->nvm->buf_data_size;
+ if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
+ return -EINVAL;
+
+ /*
+ * FARB pointer must point inside the image and must at least
+ * contain parts of the digital section we will be reading here.
+ */
+ hdr_size = (*(u32 *)buf) & 0xffffff;
+ if (hdr_size + NVM_DEVID + 2 >= image_size)
+ return -EINVAL;
+
+ /* Digital section start should be aligned to 4k page */
+ if (!IS_ALIGNED(hdr_size, SZ_4K))
+ return -EINVAL;
+
+ /*
+ * Read digital section size and check that it also fits inside
+ * the image.
+ */
+ ds_size = *(u16 *)(buf + hdr_size);
+ if (ds_size >= image_size)
+ return -EINVAL;
+
+ /*
+ * Make sure the device ID in the image matches the retimer
+ * hardware.
+ */
+ device = *(u16 *)(buf + hdr_size + NVM_DEVID);
+ if (device != rt->device)
+ return -EINVAL;
+
+ /* Skip headers in the image */
+ buf += hdr_size;
+ image_size -= hdr_size;
+
+ return usb4_port_retimer_nvm_write(rt->port, rt->index, 0, buf,
+ image_size);
+}
+
+static ssize_t device_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tb_retimer *rt = tb_to_retimer(dev);
+
+ return sprintf(buf, "%#x\n", rt->device);
+}
+static DEVICE_ATTR_RO(device);
+
+static ssize_t nvm_authenticate_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct tb_retimer *rt = tb_to_retimer(dev);
+ int ret;
+
+ if (!mutex_trylock(&rt->tb->lock))
+ return restart_syscall();
+
+ if (!rt->nvm)
+ ret = -EAGAIN;
+ else
+ ret = sprintf(buf, "%#x\n", rt->auth_status);
+
+ mutex_unlock(&rt->tb->lock);
+
+ return ret;
+}
+
+static ssize_t nvm_authenticate_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct tb_retimer *rt = tb_to_retimer(dev);
+ bool val;
+ int ret;
+
+ pm_runtime_get_sync(&rt->dev);
+
+ if (!mutex_trylock(&rt->tb->lock)) {
+ ret = restart_syscall();
+ goto exit_rpm;
+ }
+
+ if (!rt->nvm) {
+ ret = -EAGAIN;
+ goto exit_unlock;
+ }
+
+ ret = kstrtobool(buf, &val);
+ if (ret)
+ goto exit_unlock;
+
+ /* Always clear status */
+ rt->auth_status = 0;
+
+ if (val) {
+ if (!rt->nvm->buf) {
+ ret = -EINVAL;
+ goto exit_unlock;
+ }
+
+ ret = tb_retimer_nvm_validate_and_write(rt);
+ if (ret)
+ goto exit_unlock;
+
+ ret = usb4_port_retimer_nvm_authenticate(rt->port, rt->index);
+ }
+
+exit_unlock:
+ mutex_unlock(&rt->tb->lock);
+exit_rpm:
+ pm_runtime_mark_last_busy(&rt->dev);
+ pm_runtime_put_autosuspend(&rt->dev);
+
+ if (ret)
+ return ret;
+ return count;
+}
+static DEVICE_ATTR_RW(nvm_authenticate);
+
+static ssize_t nvm_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct tb_retimer *rt = tb_to_retimer(dev);
+ int ret;
+
+ if (!mutex_trylock(&rt->tb->lock))
+ return restart_syscall();
+
+ if (!rt->nvm)
+ ret = -EAGAIN;
+ else
+ ret = sprintf(buf, "%x.%x\n", rt->nvm->major, rt->nvm->minor);
+
+ mutex_unlock(&rt->tb->lock);
+ return ret;
+}
+static DEVICE_ATTR_RO(nvm_version);
+
+static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tb_retimer *rt = tb_to_retimer(dev);
+
+ return sprintf(buf, "%#x\n", rt->vendor);
+}
+static DEVICE_ATTR_RO(vendor);
+
+static struct attribute *retimer_attrs[] = {
+ &dev_attr_device.attr,
+ &dev_attr_nvm_authenticate.attr,
+ &dev_attr_nvm_version.attr,
+ &dev_attr_vendor.attr,
+ NULL
+};
+
+static const struct attribute_group retimer_group = {
+ .attrs = retimer_attrs,
+};
+
+static const struct attribute_group *retimer_groups[] = {
+ &retimer_group,
+ NULL
+};
+
+static void tb_retimer_release(struct device *dev)
+{
+ struct tb_retimer *rt = tb_to_retimer(dev);
+
+ kfree(rt);
+}
+
+struct device_type tb_retimer_type = {
+ .name = "thunderbolt_retimer",
+ .groups = retimer_groups,
+ .release = tb_retimer_release,
+};
+
+static int tb_retimer_add(struct tb_port *port, u8 index, u32 auth_status)
+{
+ struct tb_retimer *rt;
+ u32 vendor, device;
+ int ret;
+
+ if (!port->cap_usb4)
+ return -EINVAL;
+
+ ret = usb4_port_retimer_read(port, index, USB4_SB_VENDOR_ID, &vendor,
+ sizeof(vendor));
+ if (ret) {
+ if (ret != -ENODEV)
+ tb_port_warn(port, "failed read retimer VendorId: %d\n", ret);
+ return ret;
+ }
+
+ ret = usb4_port_retimer_read(port, index, USB4_SB_PRODUCT_ID, &device,
+ sizeof(device));
+ if (ret) {
+ if (ret != -ENODEV)
+ tb_port_warn(port, "failed read retimer ProductId: %d\n", ret);
+ return ret;
+ }
+
+ if (vendor != PCI_VENDOR_ID_INTEL && vendor != 0x8087) {
+ tb_port_info(port, "retimer NVM format of vendor %#x is not supported\n",
+ vendor);
+ return -EOPNOTSUPP;
+ }
+
+ /*
+ * Check that it supports NVM operations. If not then don't add
+ * the device at all.
+ */
+ ret = usb4_port_retimer_nvm_sector_size(port, index);
+ if (ret < 0)
+ return ret;
+
+ rt = kzalloc(sizeof(*rt), GFP_KERNEL);
+ if (!rt)
+ return -ENOMEM;
+
+ rt->index = index;
+ rt->vendor = vendor;
+ rt->device = device;
+ rt->auth_status = auth_status;
+ rt->port = port;
+ rt->tb = port->sw->tb;
+
+ rt->dev.parent = &port->sw->dev;
+ rt->dev.bus = &tb_bus_type;
+ rt->dev.type = &tb_retimer_type;
+ dev_set_name(&rt->dev, "%s:%u.%u", dev_name(&port->sw->dev),
+ port->port, index);
+
+ ret = device_register(&rt->dev);
+ if (ret) {
+ dev_err(&rt->dev, "failed to register retimer: %d\n", ret);
+ put_device(&rt->dev);
+ return ret;
+ }
+
+ ret = tb_retimer_nvm_add(rt);
+ if (ret) {
+ dev_err(&rt->dev, "failed to add NVM devices: %d\n", ret);
+ device_del(&rt->dev);
+ return ret;
+ }
+
+ dev_info(&rt->dev, "new retimer found, vendor=%#x device=%#x\n",
+ rt->vendor, rt->device);
+
+ pm_runtime_no_callbacks(&rt->dev);
+ pm_runtime_set_active(&rt->dev);
+ pm_runtime_enable(&rt->dev);
+ pm_runtime_set_autosuspend_delay(&rt->dev, TB_AUTOSUSPEND_DELAY);
+ pm_runtime_mark_last_busy(&rt->dev);
+ pm_runtime_use_autosuspend(&rt->dev);
+
+ return 0;
+}
+
+static void tb_retimer_remove(struct tb_retimer *rt)
+{
+ dev_info(&rt->dev, "retimer disconnected\n");
+ tb_nvm_free(rt->nvm);
+ device_unregister(&rt->dev);
+}
+
+struct tb_retimer_lookup {
+ const struct tb_port *port;
+ u8 index;
+};
+
+static int retimer_match(struct device *dev, void *data)
+{
+ const struct tb_retimer_lookup *lookup = data;
+ struct tb_retimer *rt = tb_to_retimer(dev);
+
+ return rt && rt->port == lookup->port && rt->index == lookup->index;
+}
+
+static struct tb_retimer *tb_port_find_retimer(struct tb_port *port, u8 index)
+{
+ struct tb_retimer_lookup lookup = { .port = port, .index = index };
+ struct device *dev;
+
+ dev = device_find_child(&port->sw->dev, &lookup, retimer_match);
+ if (dev)
+ return tb_to_retimer(dev);
+
+ return NULL;
+}
+
+/**
+ * tb_retimer_scan() - Scan for on-board retimers under port
+ * @port: USB4 port to scan
+ *
+ * Tries to enumerate on-board retimers connected to @port. Found
+ * retimers are registered as children of @port. Does not scan for cable
+ * retimers for now.
+ */
+int tb_retimer_scan(struct tb_port *port)
+{
+ u32 status[TB_MAX_RETIMER_INDEX] = {};
+ int ret, i, last_idx = 0;
+
+ if (!port->cap_usb4)
+ return 0;
+
+ /*
+ * Send broadcast RT to make sure retimer indices facing this
+ * port are set.
+ */
+ ret = usb4_port_enumerate_retimers(port);
+ if (ret)
+ return ret;
+
+ /*
+ * Before doing anything else, read the authentication status.
+ * If the retimer has it set, store it for the new retimer
+ * device instance.
+ */
+ for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++)
+ usb4_port_retimer_nvm_authenticate_status(port, i, &status[i]);
+
+ for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++) {
+ /*
+ * Last retimer is true only for the last on-board
+ * retimer (the one connected directly to the Type-C
+ * port).
+ */
+ ret = usb4_port_retimer_is_last(port, i);
+ if (ret > 0)
+ last_idx = i;
+ else if (ret < 0)
+ break;
+ }
+
+ if (!last_idx)
+ return 0;
+
+ /* Add on-board retimers if they do not exist already */
+ for (i = 1; i <= last_idx; i++) {
+ struct tb_retimer *rt;
+
+ rt = tb_port_find_retimer(port, i);
+ if (rt) {
+ put_device(&rt->dev);
+ } else {
+ ret = tb_retimer_add(port, i, status[i]);
+ if (ret && ret != -EOPNOTSUPP)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int remove_retimer(struct device *dev, void *data)
+{
+ struct tb_retimer *rt = tb_to_retimer(dev);
+ struct tb_port *port = data;
+
+ if (rt && rt->port == port)
+ tb_retimer_remove(rt);
+ return 0;
+}
+
+/**
+ * tb_retimer_remove_all() - Remove all retimers under port
+ * @port: USB4 port whose retimers to remove
+ *
+ * This removes all previously added retimers under @port.
+ */
+void tb_retimer_remove_all(struct tb_port *port)
+{
+ if (port->cap_usb4)
+ device_for_each_child_reverse(&port->sw->dev, port,
+ remove_retimer);
+}
diff --git a/drivers/thunderbolt/sb_regs.h b/drivers/thunderbolt/sb_regs.h
index 0e587b7b9200..9dafd696612f 100644
--- a/drivers/thunderbolt/sb_regs.h
+++ b/drivers/thunderbolt/sb_regs.h
@@ -10,6 +10,8 @@
#ifndef _SB_REGS
#define _SB_REGS
+#define USB4_SB_VENDOR_ID 0x00
+#define USB4_SB_PRODUCT_ID 0x01
#define USB4_SB_OPCODE 0x08
enum usb4_sb_opcode {
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index c8ed614f14e6..817c66c7adcf 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -2392,6 +2392,9 @@ void tb_switch_remove(struct tb_switch *sw)
tb_xdomain_remove(port->xdomain);
port->xdomain = NULL;
}
+
+ /* Remove any downstream retimers */
+ tb_retimer_remove_all(port);
}
if (!sw->is_unplugged)
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index bbcf0f25617c..f507815040eb 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -539,6 +539,9 @@ static void tb_scan_port(struct tb_port *port)
tb_port_dbg(port, "port already has a remote\n");
return;
}
+
+ tb_retimer_scan(port);
+
sw = tb_switch_alloc(port->sw->tb, &port->sw->dev,
tb_downstream_route(port));
if (IS_ERR(sw)) {
@@ -595,6 +598,9 @@ static void tb_scan_port(struct tb_port *port)
if (tb_enable_tmu(sw))
tb_sw_warn(sw, "failed to enable TMU\n");
+ /* Scan upstream retimers */
+ tb_retimer_scan(upstream_port);
+
/*
* Create USB 3.x tunnels only when the switch is plugged to the
* domain. This is because we scan the domain also during discovery
@@ -674,6 +680,7 @@ static void tb_free_unplugged_children(struct tb_switch *sw)
continue;
if (port->remote->sw->is_unplugged) {
+ tb_retimer_remove_all(port);
tb_remove_dp_resources(port->remote->sw);
tb_switch_lane_bonding_disable(port->remote->sw);
tb_switch_remove(port->remote->sw);
@@ -1039,6 +1046,8 @@ static void tb_handle_hotplug(struct work_struct *work)
goto put_sw;
}
if (ev->unplug) {
+ tb_retimer_remove_all(port);
+
if (tb_port_has_remote(port)) {
tb_port_dbg(port, "switch unplugged\n");
tb_sw_set_unplugged(port->remote->sw);
@@ -1283,6 +1292,7 @@ static int tb_free_unplugged_xdomains(struct tb_switch *sw)
if (tb_is_upstream_port(port))
continue;
if (port->xdomain && port->xdomain->is_unplugged) {
+ tb_retimer_remove_all(port);
tb_xdomain_remove(port->xdomain);
port->xdomain = NULL;
ret++;
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 8f840148378a..736d1589c31e 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -210,6 +210,28 @@ struct tb_port {
struct list_head list;
};
+/**
+ * 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)
+ * @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;
+ u32 auth_status;
+};
+
/**
* struct tb_path_hop - routing information for a tb_path
* @in_port: Ingress port of a switch
@@ -553,6 +575,7 @@ 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;
int tb_domain_init(void);
@@ -853,6 +876,21 @@ void tb_xdomain_remove(struct tb_xdomain *xd);
struct tb_xdomain *tb_xdomain_find_by_link_depth(struct tb *tb, u8 link,
u8 depth);
+int tb_retimer_scan(struct tb_port *port);
+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;
+}
+
int usb4_switch_setup(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,