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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** EHCI Controller Driver */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_hcd_ehci.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_hcd_ehci_ed_clean PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function cleans the tds attached to a ED in case a transfer */
/* has to be aborted. */
/* */
/* INPUT */
/* */
/* ed Pointer to ED */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_utility_virtual_address Get virtual address */
/* */
/* CALLED BY */
/* */
/* EHCI Controller Driver */
/* */
/**************************************************************************/
UINT _ux_hcd_ehci_ed_clean(UX_EHCI_ED *ed)
{
UX_EHCI_TD *td;
UX_EHCI_TD *next_td;
/* Get the first pointer to the TD. */
td = ed -> ux_ehci_ed_queue_element;
td = (UX_EHCI_TD *) ((ULONG) td & ~UX_EHCI_QH_T);
td = _ux_utility_virtual_address(td);
/* Mark the TD link of the endpoint as terminated. */
ed -> ux_ehci_ed_queue_element = (UX_EHCI_TD *) UX_EHCI_TD_T;
/* Free all tds attached to the ED. */
while (td != UX_NULL)
{
/* Get the next TD pointed by the current TD. */
next_td = td -> ux_ehci_td_link_pointer;
next_td = (UX_EHCI_TD *) ((ULONG) next_td & ~UX_EHCI_TD_T);
next_td = _ux_utility_virtual_address(next_td);
/* Mark the current TD as free. */
td -> ux_ehci_td_status = UX_UNUSED;
td = next_td;
}
/* Reset the first TD. */
ed -> ux_ehci_ed_first_td = UX_NULL;
/* Reset the last TD. */
ed -> ux_ehci_ed_last_td = UX_NULL;
/* Return successful completion. */
return(UX_SUCCESS);
}
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