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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 */
/** */
/** OHCI Controller Driver */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_hcd_ohci.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_hcd_ohci_request_isochronous_transfer PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs an isochronous transfer request. This */
/* function does not support multiple packets per TD as there can be */
/* issues with packets crossing 4K pages. */
/* */
/* INPUT */
/* */
/* hcd_ohci Pointer to OHCI controller */
/* transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_hcd_ohci_isochronous_td_obtain Get isochronous TD */
/* _ux_utility_physical_address Get physical address */
/* _ux_utility_virtual_address Get virtual address */
/* */
/* CALLED BY */
/* */
/* OHCI Controller Driver */
/* */
/**************************************************************************/
UINT _ux_hcd_ohci_request_isochronous_transfer(UX_HCD_OHCI *hcd_ohci, UX_TRANSFER *transfer_request)
{
UX_ENDPOINT *endpoint;
UX_OHCI_ISO_TD *data_td;
UX_OHCI_ISO_TD *start_data_td;
UX_OHCI_ISO_TD *next_data_td;
UX_OHCI_ISO_TD *previous_td;
UX_OHCI_ISO_TD *tail_td;
UX_OHCI_ED *ed;
ULONG transfer_request_payload_length;
ULONG isoch_packet_payload_length;
UCHAR * data_pointer;
ULONG current_frame_number;
/* 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;
/* Reset the MPS value of the ED. */
ed -> ux_ohci_ed_dw0 &= UX_OHCI_ED_MPS;
/* If the transfer request specifies a max packet length other than the endpoint
size, we force the transfer request value into the endpoint. */
if (transfer_request -> ux_transfer_request_packet_length == 0)
transfer_request -> ux_transfer_request_packet_length = (ULONG) endpoint -> ux_endpoint_descriptor.wMaxPacketSize;
/* Set the packet length in the ED. */
ed -> ux_ohci_ed_dw0 |= transfer_request -> ux_transfer_request_packet_length << 16;
isoch_packet_payload_length = transfer_request -> ux_transfer_request_packet_length;
/* Use the TD pointer by ed -> tail for the first TD of this transfer
and chain from this one on. */
data_td = _ux_utility_virtual_address(ed -> ux_ohci_ed_tail_td);
previous_td = data_td;
/* Reset the first obtained data TD in case there is a TD shortage while building the list of TDs. */
start_data_td = UX_NULL;
/* Calculate the frame number to be used to send this payload. If there are no current transfers,
we take the current frame number and add a safety value (2-5) to it. If here is pending transactions,
we use the frame number stored in the transfer request. */
if (ed -> ux_ohci_ed_tail_td == ed -> ux_ohci_ed_head_td)
{
current_frame_number = hcd_ohci -> ux_hcd_ohci_hcca -> ux_hcd_ohci_hcca_frame_number + UX_OHCI_FRAME_DELAY;
ed -> ux_ohci_ed_frame = current_frame_number;
}
else
current_frame_number = ed -> ux_ohci_ed_frame;
/* Load the start buffer address and URB length to split the URB in multiple TD transfer. */
transfer_request_payload_length = transfer_request -> ux_transfer_request_requested_length;
data_pointer = transfer_request -> ux_transfer_request_data_pointer;
while (transfer_request_payload_length != 0)
{
/* Set the default CC value. Default is 1 packet per TD frame. */
data_td -> ux_ohci_iso_td_dw0 = UX_OHCI_TD_DEFAULT_DW0;
/* Set the direction. In Iso, this is done at the ED level. */
if ((transfer_request -> ux_transfer_request_type & UX_REQUEST_DIRECTION) == UX_REQUEST_IN)
ed -> ux_ohci_ed_dw0 |= UX_OHCI_ED_IN;
else
ed -> ux_ohci_ed_dw0 |= UX_OHCI_ED_OUT;
/* Set the frame number. */
data_td -> ux_ohci_iso_td_dw0 |= (USHORT) current_frame_number;
/* The buffer address is divided into a page and an offset. */
data_td -> ux_ohci_iso_td_bp0 = _ux_utility_physical_address((VOID *)((ULONG) data_pointer & UX_OHCI_ISO_TD_BASE));
data_td -> ux_ohci_iso_td_offset_psw[0] = (USHORT)((ULONG) _ux_utility_physical_address(data_pointer) & UX_OHCI_ISO_TD_OFFSET);
/* Set the condition code for the current packet. */
data_td -> ux_ohci_iso_td_offset_psw[0] |= (USHORT) UX_OHCI_ISO_TD_PSW_CC;
/* Program the end address of the buffer. */
data_td -> ux_ohci_iso_td_be = ((UCHAR *) _ux_utility_physical_address(data_pointer)) + isoch_packet_payload_length - 1;
/* Update the length of the transfer for this TD. */
data_td -> ux_ohci_iso_td_length = isoch_packet_payload_length;
/* Attach the endpoint and transfer request to the TD. */
data_td -> ux_ohci_iso_td_transfer_request = transfer_request;
data_td -> ux_ohci_iso_td_ed = ed;
/* Adjust the data payload length and the data payload pointer. */
transfer_request_payload_length -= isoch_packet_payload_length;
data_pointer += isoch_packet_payload_length;
/* Prepare the next frame for the next TD in advance. */
current_frame_number++;
/* Check if there will be another transaction. */
if (transfer_request_payload_length != 0)
{
/* Get a new TD to hook this payload. */
data_td = _ux_hcd_ohci_isochronous_td_obtain(hcd_ohci);
if (data_td == UX_NULL)
{
/* If there was already a TD chain in progress, free it. */
if (start_data_td != UX_NULL)
{
data_td = start_data_td;
while(data_td)
{
next_data_td = _ux_utility_virtual_address(data_td -> ux_ohci_iso_td_next_td);
data_td -> ux_ohci_iso_td_status = UX_UNUSED;
data_td = next_data_td;
}
}
return(UX_NO_TD_AVAILABLE);
}
/* the first obtained TD in the chain has to be remembered. */
if (start_data_td == UX_NULL)
start_data_td = data_td;
/* Attach this new TD to the previous one. */
previous_td -> ux_ohci_iso_td_next_td = _ux_utility_physical_address(data_td);
previous_td = data_td;
}
}
/* Memorize the next frame number for this ED. */
ed -> ux_ohci_ed_frame = current_frame_number;
/* At this stage, the Head and Tail in the ED are still the same and
the OHCI controller will skip this ED until we have hooked the new
tail TD. */
tail_td = _ux_hcd_ohci_isochronous_td_obtain(hcd_ohci);
if (tail_td == UX_NULL)
{
/* If there was already a TD chain in progress, free it. */
if (start_data_td != UX_NULL)
{
data_td = start_data_td;
while (data_td)
{
next_data_td = _ux_utility_virtual_address(data_td -> ux_ohci_iso_td_next_td);
data_td -> ux_ohci_iso_td_status = UX_UNUSED;
data_td = next_data_td;
}
}
return(UX_NO_TD_AVAILABLE);
}
/* Attach the tail TD to the last data TD. */
data_td -> ux_ohci_iso_td_next_td = _ux_utility_physical_address(tail_td);
/* Adjust the ED tail pointer, the controller can now start this transfer
at the chosen frame number. */
ed -> ux_ohci_ed_tail_td = _ux_utility_physical_address(tail_td);
/* Return successful completion. */
return(UX_SUCCESS);
}
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