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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_asynchronous_endpoint_destroy PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will destroy an asynchronous endpoint. The control */
/* and bulk endpoints fall into this category. */
/* */
/* INPUT */
/* */
/* hcd_ehci Pointer to EHCI controller */
/* endpoint Pointer to endpoint */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_hcd_ehci_door_bell_wait Wait for door bell */
/* _ux_utility_physical_address Get physical address */
/* */
/* CALLED BY */
/* */
/* EHCI Controller Driver */
/* */
/**************************************************************************/
UINT _ux_hcd_ehci_asynchronous_endpoint_destroy(UX_HCD_EHCI *hcd_ehci, UX_ENDPOINT *endpoint)
{
UX_EHCI_ED *ed;
UX_EHCI_ED *previous_ed;
UX_EHCI_ED *next_ed;
UX_EHCI_LINK_POINTER queue_head;
/* From the endpoint container fetch the EHCI ED descriptor. */
ed = (UX_EHCI_ED *) endpoint -> ux_endpoint_ed;
/* Get the previous ED in the list for this ED. */
previous_ed = ed -> ux_ehci_ed_previous_ed;
/* Get the next ED in the list for this ED. */
next_ed = ed -> ux_ehci_ed_next_ed;
/* Point the previous ED to the ED after the ED to be removed. */
previous_ed -> ux_ehci_ed_next_ed = next_ed;
/* Point the next ED previous pointer to the previous ED. */
next_ed -> ux_ehci_ed_previous_ed = previous_ed;
/* Now remove the physical link. */
queue_head.void_ptr = _ux_utility_physical_address(next_ed);
queue_head.value |= UX_EHCI_QH_TYP_QH;
previous_ed -> ux_ehci_ed_queue_head = queue_head.ed_ptr;
/* If this ED was the last ED, we need to update the HCD last ED value. */
if (hcd_ehci -> ux_hcd_ehci_asynch_last_list == ed)
hcd_ehci -> ux_hcd_ehci_asynch_last_list = previous_ed;
/* Arm the doorbell and wait for its completion. */
_ux_hcd_ehci_door_bell_wait(hcd_ehci);
/* Now we can safely make the ED free. */
ed -> ux_ehci_ed_status = UX_UNUSED;
/* Return successful completion. */
return(UX_SUCCESS);
}
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