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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** Host Stack */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_stack.h" |
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#if UX_MAX_DEVICES > 1 |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_stack_bandwidth_release PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function will release bandwidth for a periodic endpoint. The */ |
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/* bandwidth requirement is calculated by the MaxPacketSize field of */ |
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/* endpoint and the speed of the endpoint. If the device is on a 1.1 */ |
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/* bus or it is a 1.1 device behind a 2.0 hub on a 2.0 bus, the device */ |
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/* bandwidth must be multiplied by 8 on the 1.1 segment. */ |
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/* */ |
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/* This algorithm takes into account both TT bandwidth and HCD */ |
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/* bandwidth. The TTs are attached to the device structure and not the */ |
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/* hub structure in order to make the stack agnostic of the hub class. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* HCD Pointer to HCD */ |
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/* endpoint Pointer to endpoint */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* USBX Components */ |
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/* */ |
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/**************************************************************************/ |
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VOID _ux_host_stack_bandwidth_release(UX_HCD *hcd, UX_ENDPOINT *endpoint) |
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{ |
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UX_DEVICE *device; |
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UX_DEVICE *parent_device; |
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USHORT hcd_bandwidth_claimed; |
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USHORT max_packet_size; |
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LONG packet_size; |
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USHORT tt_bandwidth_claimed = 0; |
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ULONG port_index; |
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ULONG port_map; |
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ULONG tt_index; |
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const UCHAR overheads[4][3] = { |
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/* LS FS HS */ |
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{63, 45, 173}, /* Control */ |
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{ 0, 9, 38}, /* Isochronous */ |
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{ 0, 13, 55}, /* Bulk */ |
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{19, 13, 55} /* Interrupt */ |
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}; |
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/* Get the pointer to the device. */ |
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device = endpoint -> ux_endpoint_device; |
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/* Calculate the bandwidth. From USB spec. |
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* |
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* The frame unit consumed per byte is like follow: |
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* Bytes/FrameUnit FrameUnit/byte FrameUnit/byte |
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* (Overhead included) (HS baseline) (FS baseline) |
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* Low Speed 187.5 40 8 |
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* Full Speed 1500 5 1 |
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* High Speed 7500 1 1/5 |
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* |
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* The overhead is like follow: |
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* Control Isochronous Bulk Interrupt |
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* bmAttribute (0) (1) (2) (3) |
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* Low Speed 63 -- -- 19 |
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* Full Speed 45 9 13 13 |
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* High Speed 173 38 55 55 |
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* |
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* Worst case bit stuffing is calculated as 1.1667 (7/6) times the raw time. |
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*/ |
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/* Get maximum packet size. */ |
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max_packet_size = endpoint -> ux_endpoint_descriptor.wMaxPacketSize & UX_MAX_PACKET_SIZE_MASK; |
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/* Rough time for possible Bit Stuffing. */ |
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packet_size = (max_packet_size * 7 + 5) / 6; |
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/* Add overhead. */ |
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packet_size += overheads[endpoint -> ux_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE][device -> ux_device_speed]; |
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max_packet_size = (USHORT)packet_size; |
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/* Check for high-speed endpoint. */ |
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✓✓ |
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if (device -> ux_device_speed == UX_HIGH_SPEED_DEVICE) |
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{ |
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/* Get number of transactions. */ |
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max_packet_size = (USHORT)(max_packet_size * |
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(((endpoint -> ux_endpoint_descriptor.wMaxPacketSize & UX_MAX_NUMBER_OF_TRANSACTIONS_MASK) >> |
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UX_MAX_NUMBER_OF_TRANSACTIONS_SHIFT) + 1)); |
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} |
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/* Calculate the bandwidth claimed by this endpoint for the main bus. */ |
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✓✓ |
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if (hcd -> ux_hcd_version != 0x200) |
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{ |
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✓✓ |
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if (device -> ux_device_speed == UX_LOW_SPEED_DEVICE) |
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/* Low speed transfer takes 40x more units than high speed. */ |
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hcd_bandwidth_claimed = (USHORT)(max_packet_size * 8 * 5); |
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else |
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{ |
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✓✓ |
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if (device -> ux_device_speed == UX_FULL_SPEED_DEVICE) |
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/* Full speed transfer takes 5x more units than high speed. */ |
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hcd_bandwidth_claimed = (USHORT)(max_packet_size * 5); |
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else |
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/* Use high speed timing as base for bus bandwidth calculation. */ |
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hcd_bandwidth_claimed = (USHORT)max_packet_size; |
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} |
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} |
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else |
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{ |
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hcd_bandwidth_claimed = (USHORT)max_packet_size; |
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✓✓ |
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if (device -> ux_device_speed == UX_LOW_SPEED_DEVICE) |
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/* Low speed transfer takes 8x more units than full speed. */ |
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tt_bandwidth_claimed = (USHORT)(max_packet_size * 8); |
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else |
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/* Use full speed timing as base for TT bandwidth calculation. */ |
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tt_bandwidth_claimed = (USHORT)max_packet_size; |
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} |
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/* Free the HCD bandwidth. */ |
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hcd -> ux_hcd_available_bandwidth += hcd_bandwidth_claimed; |
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/* We need to take care of the case where the endpoint belongs to a USB 1.1 |
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device that sits behind a 2.0 hub. We ignore cases where the device |
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is either high speed or the bus is 1.1. */ |
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✓✓✓✓
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if ((device -> ux_device_speed == UX_HIGH_SPEED_DEVICE) || (hcd -> ux_hcd_version != 0x200)) |
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{ |
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/* The device is high speed, therefore no need for TT. */ |
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return; |
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} |
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/* We have a 1.1 device, check if the parent is a 2.0 hub. */ |
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parent_device = device -> ux_device_parent; |
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✓✓ |
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if (parent_device == UX_NULL) |
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{ |
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/* We are at the root, must be a 1.1 controller then! */ |
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return; |
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} |
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/* We get here when the parent is a hub. The problem occurs when the hub is itself |
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connected to a chain of hubs. We need to find the first 2.0 hub parent to this chain |
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to check the TT. We need to remember the port on which the first 1.1 device is |
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hooked to. */ |
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port_index = device -> ux_device_port_location - 1; |
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/* Scan the chain of hubs upward. */ |
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✓✓ |
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while (parent_device != UX_NULL) |
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{ |
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/* Check for a high speed device. */ |
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✓✓ |
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if (parent_device -> ux_device_speed == UX_HIGH_SPEED_DEVICE) |
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{ |
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/* The device is a high speed hub, find the TT that manages the port. |
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The first 1.1 device is connected to. First we calculate the port mapping bit. */ |
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port_map = (ULONG)(1 << port_index); |
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/* Parse all the TTs attached to the hub. */ |
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✓✓ |
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for (tt_index = 0; tt_index < UX_MAX_TT; tt_index++) |
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{ |
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/* Check if this TT owns the port where the device is attached. */ |
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✓✓ |
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if ((parent_device -> ux_device_hub_tt[tt_index].ux_hub_tt_port_mapping & port_map) != 0) |
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{ |
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/* We have found the port, check if the tt can give us the bandwidth |
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we want to claim. */ |
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parent_device -> ux_device_hub_tt[tt_index].ux_hub_tt_max_bandwidth += tt_bandwidth_claimed; |
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return; |
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} |
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} |
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/* We should never get here!!!!! */ |
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return; |
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} |
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/* We now remember where this hub is located on the parent. */ |
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port_index = parent_device -> ux_device_port_location - 1; |
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/* We go up one level in the hub chain. */ |
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parent_device = parent_device -> ux_device_parent; |
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} |
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/* We get here when we have not found a 2.0 hub in the list and we got |
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to the root port. */ |
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return; |
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} |
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#endif /* #if UX_MAX_DEVICES > 1 */ |