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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_request_bulk_transfer PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs a bulk transfer request. A bulk transfer */
/* can be larger than the size of the EHCI buffer so it may be */
/* required to chain multiple tds to accommodate this request. A bulk */
/* transfer is non blocking, so we return before the request is */
/* completed. */
/* */
/* INPUT */
/* */
/* hcd_ehci Pointer to EHCI controller */
/* transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_hcd_ehci_request_transfer_add Add transfer to ED */
/* */
/* CALLED BY */
/* */
/* EHCI Controller Driver */
/* */
/**************************************************************************/
UINT _ux_hcd_ehci_request_bulk_transfer(UX_HCD_EHCI *hcd_ehci, UX_TRANSFER *transfer_request)
{
UX_ENDPOINT *endpoint;
UX_EHCI_ED *ed;
ULONG transfer_request_payload_length;
ULONG bulk_packet_payload_length;
UCHAR * data_pointer;
ULONG pid;
ULONG td_component;
UINT status;
ULONG zlp_flag;
/* Get the pointer to the Endpoint. */
endpoint = (UX_ENDPOINT *) transfer_request -> ux_transfer_request_endpoint;
/* Now get the physical ED attached to this endpoint. */
ed = endpoint -> ux_endpoint_ed;
/* The overlay parameters should be reset now. */
ed -> ux_ehci_ed_current_td = UX_NULL;
ed -> ux_ehci_ed_queue_element = (UX_EHCI_TD *)UX_EHCI_TD_T;
ed -> ux_ehci_ed_alternate_td = (UX_EHCI_TD *)UX_EHCI_TD_T;
ed -> ux_ehci_ed_state &= UX_EHCI_QH_TOGGLE;
ed -> ux_ehci_ed_bp0 = UX_NULL;
ed -> ux_ehci_ed_bp0 = UX_NULL;
ed -> ux_ehci_ed_bp1 = UX_NULL;
ed -> ux_ehci_ed_bp2 = UX_NULL;
ed -> ux_ehci_ed_bp3 = UX_NULL;
ed -> ux_ehci_ed_bp4 = UX_NULL;
/* It may take more than one TD if the transfer_request length is more than the
maximum length for an EHCI TD (this is irrelevant of the MaxPacketSize value
in the endpoint descriptor). EHCI data payload has a maximum size of 16K. */
transfer_request_payload_length = transfer_request -> ux_transfer_request_requested_length;
data_pointer = transfer_request -> ux_transfer_request_data_pointer;
/* Check for ZLP condition. */
if (transfer_request_payload_length == 0)
/* We have a zlp condition. */
zlp_flag = UX_TRUE;
else
/* We do not have a zlp. */
zlp_flag = UX_FALSE;
/* Build all necessary TDs. */
while ((transfer_request_payload_length != 0) || zlp_flag == UX_TRUE)
{
/* Reset ZLP now. */
zlp_flag = UX_FALSE;
/* Check if we are exceeding the max payload. */
if (transfer_request_payload_length > UX_EHCI_MAX_PAYLOAD)
bulk_packet_payload_length = UX_EHCI_MAX_PAYLOAD;
else
bulk_packet_payload_length = transfer_request_payload_length;
/* Add this transfer request to the ED. */
if ((transfer_request -> ux_transfer_request_type&UX_REQUEST_DIRECTION) == UX_REQUEST_IN)
pid = UX_EHCI_PID_IN;
else
pid = UX_EHCI_PID_OUT;
status = _ux_hcd_ehci_request_transfer_add(hcd_ehci, ed, 0, pid, 0,
data_pointer, bulk_packet_payload_length, transfer_request);
if (status != UX_SUCCESS)
return(status);
/* Adjust the data payload length and the data payload pointer. */
transfer_request_payload_length -= bulk_packet_payload_length;
data_pointer += bulk_packet_payload_length;
}
/* Set the IOC bit in the last TD. */
ed -> ux_ehci_ed_last_td -> ux_ehci_td_control |= UX_EHCI_TD_IOC;
/* Ensure the IOC bit is set before activating the TD. This is necessary
for some processors that perform writes out of order as an optimization. */
UX_DATA_MEMORY_BARRIER
/* Activate the first TD linked to the ED. */
td_component = (ULONG) ed -> ux_ehci_ed_queue_element;
td_component &= ~UX_EHCI_TD_T;
ed -> ux_ehci_ed_queue_element = (UX_EHCI_TD *) td_component;
/* Return successful completion. */
return(UX_SUCCESS);
}
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