133 lines
7 KiB
Rust
133 lines
7 KiB
Rust
use bitfield_struct::bitfield;
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#[bitfield(u128)]
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pub struct SlotContextFields {
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/// Route String. This field is used by hubs to route packets to the correct downstream port. The
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/// format of the Route String is defined in section 8.9 the USB3 specification.
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/// As Input, this field shall be set for all USB devices, irrespective of their speed, to indicate their
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/// location in the USB topology.
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#[bits(20)]
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pub route_string: u32,
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/// Speed. This field is deprecated in this version of the specification and shall be Reserved.
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/// This field indicates the speed of the device. Refer to the PORTSC Port Speed field in Table 5-27
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/// for the definition of the valid values
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#[bits(4)]
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pub speed: u8,
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__: bool,
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/// Multi-TT (MTT). This flag is set to '1' by software if this is a High-speed hub that supports
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/// Multiple TTs and the Multiple TT Interface has been enabled by software, or if this is a Low-
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/// /Full-speed device or Full-speed hub and connected to the xHC through a parent108 High-speed
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/// hub that supports Multiple TTs and the Multiple TT Interface of the parent hub has been
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/// enabled by software, or ‘0’ if not.
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pub multi_tt: bool,
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/// Hub. This flag is set to '1' by software if this device is a USB hub, or '0' if it is a USB function
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pub hub: bool,
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/// Context Entries. This field identifies the index of the last valid Endpoint Context within this
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/// Device Context structure. The value of ‘0’ is Reserved and is not a valid entry for this field. Valid
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/// entries for this field shall be in the range of 1-31. This field indicates the size of the Device
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/// Context structure. For example, ((Context Entries+1) * 32 bytes) = Total bytes for this structure.
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///
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/// Note, Output Context Entries values are written by the xHC, and Input Context Entries values are
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/// written by software.
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#[bits(5)]
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pub context_entries: u8,
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/// Max Exit Latency. The Maximum Exit Latency is in microseconds, and indicates the worst case
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/// time it takes to wake up all the links in the path to the device, given the current USB link level
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/// power management settings.
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///
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/// Refer to section 4.23.5.2 for more information on the use of this field.
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pub max_exit_latency: u16,
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/// Root Hub Port Number. This field identifies the Root Hub Port Number used to access the USB
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/// device. Refer to section 4.19.7 for port numbering information.
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///
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/// Note: Ports are numbered from 1 to MaxPorts
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pub root_hub_port_number: u8,
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/// Number of Ports. If this device is a hub (Hub = ‘1’), then this field is set by software to identify
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/// the number of downstream facing ports supported by the hub. Refer to the bNbrPorts field
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/// description in the Hub Descriptor (Table 11-13) of the USB2 spec. If this device is not a hub (Hub
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/// = ‘0’), then this field shall be ‘0
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pub number_of_ports: u8,
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/// Parent Hub Slot ID. If this device is Low-/Full-speed and connected through a High-speed hub,
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/// then this field shall contain the Slot ID of the parent High-speed hub109.
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///
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/// For SS and SSP bus instance, if this device is connected through a higher rank hub110 then this
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/// field shall contain the Slot ID of the parent hub. For example, a Gen1 x1 connected behind a
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/// Gen1 x2 hub, or Gen1 x2 device connected behind Gen2 x2 hub.
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///
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/// This field shall be ‘0’ if any of the following are true:
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/// Device is attached to a Root Hub port
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/// Device is a High-Speed device
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/// Device is the highest rank SS/SSP device supported by xHCI
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pub parent_hub_slot_id: u8,
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/// Parent Port Number. If this device is Low-/Full-speed and connected through a High-speed
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/// hub, then this field shall contain the number of the downstream facing port of the parent High-
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/// speed hub109.
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/// For SS and SSP bus instance, if this device is connected through a higher rank hub110 then this
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/// field shall contain the number of the downstream facing port of the parent hub. For example, a
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/// Gen1 x1 connected behind a Gen1 x2 hub, or Gen1 x2 device connected behind Gen2 x2 hub.
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/// This field shall be ‘0’ if any of the following are true:
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/// Device is attached to a Root Hub port
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/// Device is a High-Speed device
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/// Device is the highest rank SS/SSP device supported by xH
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pub parent_port_number: u8,
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/// TT Think Time (TTT). If this is a High-speed hub (Hub = ‘1’ and Speed = High-Speed), then this
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/// field shall be set by software to identify the time the TT of the hub requires to proceed to the
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/// next full-/low-speed transaction.
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/// Value Think Time
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/// 0 TT requires at most 8 FS bit times of inter-transaction gap on a full-/low-speed
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/// downstream bus.
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/// 1 TT requires at most 16 FS bit times.
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/// 2 TT requires at most 24 FS bit times.
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/// 3 TT requires at most 32 FS bit times.
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/// Refer to the TT Think Time sub-field of the wHubCharacteristics field description in the Hub
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/// Descriptor (Table 11-13) and section 11.18.2 of the USB2 spec for more information on TT
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/// Think Time. If this device is not a High-speed hub (Hub = ‘0’ or Speed != High-speed), then this
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/// field shall be ‘0’.
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#[bits(2)]
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pub tt_think_time: u8,
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#[bits(4)]
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__: u8,
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/// Interrupter Target. This field defines the index of the Interrupter that will receive Bandwidth
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/// Request Events and Device Notification Events generated by this slot, or when a Ring Underrun
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/// or Ring Overrun condition is reported (refer to section 4.10.3.1). Valid values are between 0 and
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/// MaxIntrs-1
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#[bits(10)]
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pub interrupter_target: u16,
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/// USB Device Address. This field identifies the address assigned to the USB device by the xHC,
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/// and is set upon the successful completion of a Set Address Command. Refer to the USB2 spec
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/// for a more detailed description.
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///
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/// As Output, this field is invalid if the Slot State = Disabled or Default.
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/// As Input, software shall initialize the field to ‘0’.
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pub usb_device_address: u8,
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#[bits(19)]
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__: u32,
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/// Slot State. This field is updated by the xHC when a Device Slot transitions from one state to
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/// another.
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/// Value Slot State
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/// 0 Disabled/Enabled
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/// 1 Default
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/// 2 Addressed
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/// 3 Configured
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/// 31-4 Reserved
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///
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/// Slot States are defined in section 4.5.3.
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///
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/// As Output, since software initializes all fields of the Device Context data structure to ‘0’, this field
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/// shall initially indicate the Disabled state.
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///
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/// As Input, software shall initialize the field to ‘0’.
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/// Refer to section 4.5.3 for more information on Slot State.
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#[bits(5)]
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pub slot_state: u8,
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}
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#[repr(C)]
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pub struct SlotContext {
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pub fields: SlotContextFields,
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__: u128,
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}
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const _: () = assert!(size_of::<SlotContext>() == 0x20);
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