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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_isochronous_transfer PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs an isochronous transfer request (list). */
/* */
/* Note: the request max length is endpoint max packet size, multiple */
/* endpoint max number of transactions. */
/* */
/* INPUT */
/* */
/* hcd_ehci Pointer to EHCI controller */
/* transfer_request Pointer to transfer request. */
/* If next transfer request is */
/* valid the whole request list */
/* is added, until next transfer */
/* request being NULL. If next */
/* next transfer request is not */
/* valid (being NULL) single */
/* transfer request is added. */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_mutex_on Get mutex */
/* _ux_host_mutex_off Put mutex */
/* _ux_host_semaphore_put Put semaphore */
/* */
/* CALLED BY */
/* */
/* EHCI Controller Driver */
/* */
/**************************************************************************/
UINT _ux_hcd_ehci_request_isochronous_transfer(UX_HCD_EHCI *hcd_ehci, UX_TRANSFER *transfer_request)
{
#if UX_MAX_ISO_TD == 0
UX_PARAMETER_NOT_USED(hcd_ehci);
UX_PARAMETER_NOT_USED(transfer_request);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_FUNCTION_NOT_SUPPORTED, 0, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* Not supported yet - return error. */
return(UX_FUNCTION_NOT_SUPPORTED);
#else
UX_ENDPOINT *endpoint;
UX_EHCI_PERIODIC_LINK_POINTER lp;
UX_EHCI_HSISO_ED *ied;
UX_TRANSFER **head;
UX_TRANSFER **tail;
UX_TRANSFER **first_new;
UX_TRANSFER *request_list;
UCHAR start = UX_FALSE;
/* Get the pointer to the endpoint. */
endpoint = (UX_ENDPOINT *) transfer_request -> ux_transfer_request_endpoint;
/* Now get the physical iTD/siTD attached to this endpoint. */
lp.ed_ptr = endpoint -> ux_endpoint_ed;
/* Lock the periodic list to update. */
_ux_host_mutex_on(&hcd_ehci -> ux_hcd_ehci_periodic_mutex);
/* Append the request to iTD/siTD request list tail. */
#if defined(UX_HCD_EHCI_SPLIT_TRANSFER_ENABLE)
if (endpoint -> ux_endpoint_device -> ux_device_speed != UX_HIGH_SPEED_DEVICE)
head = &lp.sitd_ptr -> ux_ehci_fsiso_td_transfer_head;
else
#endif
{
/* Get pointer of ED. */
ied = lp.itd_ptr -> ux_ehci_hsiso_td_ed;
/* Get pointer locations. */
head = &ied -> ux_ehci_hsiso_ed_transfer_head;
tail = &ied -> ux_ehci_hsiso_ed_transfer_tail;
first_new = &ied -> ux_ehci_hsiso_ed_transfer_first_new;
/* If there is no transfer, start. */
if (ied -> ux_ehci_hsiso_ed_frstart == 0xFF)
{
ied -> ux_ehci_hsiso_ed_frstart = 0xFE;
ied -> ux_ehci_hsiso_ed_fr_sw = 0;
ied -> ux_ehci_hsiso_ed_fr_hc = 0;
start = UX_TRUE;
}
}
request_list = (*head);
if (request_list == UX_NULL)
{
/* Link to head. */
(*head) = transfer_request;
(*tail) = transfer_request;
(*first_new) = transfer_request;
}
else
{
/* Link to tail of the list. */
(*tail) -> ux_transfer_request_next_transfer_request = transfer_request;
/* In case there is nothing to load, set new ones. */
if (*first_new == UX_NULL)
*first_new = transfer_request;
}
/* Move tail until it's real last one. */
while((*tail) -> ux_transfer_request_next_transfer_request != UX_NULL)
(*tail) = ((*tail) -> ux_transfer_request_next_transfer_request);
/* Release the periodic table. */
_ux_host_mutex_off(&hcd_ehci -> ux_hcd_ehci_periodic_mutex);
/* Simulate iTD/siTD done to start - HCD signal. */
if (start)
{
hcd_ehci -> ux_hcd_ehci_hcd_owner -> ux_hcd_thread_signal ++;
_ux_host_semaphore_put(&_ux_system_host -> ux_system_host_hcd_semaphore);
}
/* Return completion status. */
return(UX_SUCCESS);
#endif
}
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