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.Dd October 21, 2022
.Dt XHCI 4
.Os
.Sh NAME
.Nm xhci
.Nd USB eXtensible Host Controller driver
.Sh SYNOPSIS
.Cd "options USB_DEBUG"
.Cd "device xhci"
.Sh DESCRIPTION
The
.Nm
driver provides support for the
.Tn USB
eXtensible Host Controller Interface,
which allows use of
.Tn USB
1.0, 2.0 and 3.0 devices on the same
.Tn USB
port.
.Pp
The
.Tn XHCI
controller supports
.Tn USB
connection speeds from 5.0Gbps and above when using USB 3.x
compliant devices.
.Sh HARDWARE
The
.Nm
driver supports
.Tn XHCI
compatible controllers having PCI class 12 (serial bus),
subclass 3 (USB) and programming interface 48 (XHCI).
.Sh SYSCTL VARIABLES
The following variables are available as both
.Xr sysctl 8
variables and
.Xr loader 8
tunables:
.Bl -tag -width indent
.It Va hw.usb.xhci.debug
Set debug output level, where 0 is debugging disabled and larger
values increase debug message verbosity.
The default value is 0.
.It Va hw.usb.xhci.dcepquirk
Set to enable quirk for deconfiguration of endpoints.
The default value is 0.
.It Va hw.usb.xhci.ctlquirk
Set to submit full USB control request as one job, up to 64kBytes.
Else the USB control request will be split into multiple smaller
requests.
The default value is 1.
.It Va hw.usb.xhci.streams
Set to enable USB streams support.
The default value is 0.
.It Va hw.usb.xhci.route
Set bitmap for switching EHCI ports to the XHCI controller.
The default value is 0.
.It Va hw.usb.xhci.polling
Set to use a timer to poll the interrupt handler.
The default value is 0.
.It Va hw.usb.xhci.dma32
Set to only use 32-bit DMA for the XHCI controller.
The default value is 0.
.It Va hw.usb.xhci.ctlstep
Set to enable control endpoint status state stepping.
The default value is 0.
.El
.Sh SEE ALSO
.Xr ehci 4 ,
.Xr ohci 4 ,
.Xr uhci 4 and
.Xr usb 4
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 8.2 .