common/usbx_host_controllers/src/ux_hcd_ehci_endpoint_reset.c


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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_endpoint_reset                         PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Chaoqiong Xiao, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function will reset an endpoint.                               */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    hcd_ehci                              Pointer to EHCI controller    */
/*    endpoint                              Pointer to endpoint           */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    Completion Status                                                   */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    EHCI Controller Driver                                              */
/*                                                                        */
/**************************************************************************/
UINT  _ux_hcd_ehci_endpoint_reset(UX_HCD_EHCI *hcd_ehci, UX_ENDPOINT *endpoint)
{

UX_EHCI_ED      *ed;
ULONG           ed_value;


    UX_PARAMETER_NOT_USED(hcd_ehci);

    /* From the endpoint container fetch the EHCI ED descriptor.  */
    ed =  (UX_EHCI_ED*) endpoint -> ux_endpoint_ed;

    /* Reset the data0/data1 toggle bit in the Overlay portion of the ED.  */
    ed_value =  ed -> ux_ehci_ed_state;
    ed_value &=  ~UX_EHCI_QH_TOGGLE;
    ed -> ux_ehci_ed_state =  ed_value;

    /* This operation never fails!  */
    return(UX_SUCCESS);
}