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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_asynchronous_endpoint_create PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will create an asynchronous endpoint. The control */
/* and bulk endpoints fall into this category. */
/* */
/* INPUT */
/* */
/* hcd_ohci Pointer to OHCI HCD */
/* endpoint Pointer to endpoint */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_hcd_ohci_ed_obtain Obtain a new ED */
/* _ux_hcd_ohci_register_read Read OHCI register */
/* _ux_hcd_ohci_register_write Write OHCI register */
/* _ux_utility_physical_address Get physical address */
/* */
/* CALLED BY */
/* */
/* OHCI Controller Driver */
/* */
/**************************************************************************/
UINT _ux_hcd_ohci_asynchronous_endpoint_create(UX_HCD_OHCI *hcd_ohci, UX_ENDPOINT *endpoint)
{
UX_DEVICE *device;
UX_OHCI_ED *ed;
UX_OHCI_ED *head_ed;
UX_OHCI_TD *td;
ULONG ohci_register;
/* We need to take into account the nature of the HCD to define the max size
of any transfer in the transfer request. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_maximum_length = UX_OHCI_MAX_PAYLOAD;
/* Obtain a ED for this new endpoint. This ED will live as long as the endpoint is active and
will be the container for the TDs. */
ed = _ux_hcd_ohci_ed_obtain(hcd_ohci);
if (ed == UX_NULL)
return(UX_NO_ED_AVAILABLE);
/* Obtain a dummy TD for terminating the ED transfer chain. */
td = _ux_hcd_ohci_regular_td_obtain(hcd_ohci);
if (td == UX_NULL)
{
ed -> ux_ohci_ed_status = UX_UNUSED;
return(UX_NO_TD_AVAILABLE);
}
/* Attach the ED to the endpoint container. */
endpoint -> ux_endpoint_ed = (VOID *) ed;
/* Now do the opposite, attach the ED container to the physical ED. */
ed -> ux_ohci_ed_endpoint = endpoint;
/* Program the ED for subsequent transfers. We need to set the following things:
1) Address of the device
2) endpoint number
3) speed
4) format of TD
5) maximum packet size */
device = endpoint -> ux_endpoint_device;
ed -> ux_ohci_ed_dw0 = device -> ux_device_address |
((ULONG) (endpoint -> ux_endpoint_descriptor.bEndpointAddress & ~UX_ENDPOINT_DIRECTION)) << 7 |
((ULONG) endpoint -> ux_endpoint_descriptor.wMaxPacketSize) << 16;
if (device -> ux_device_speed == UX_LOW_SPEED_DEVICE)
ed -> ux_ohci_ed_dw0 |= UX_OHCI_ED_LOW_SPEED;
/* Hook the TD to both the tail and head of the ED. */
ed -> ux_ohci_ed_tail_td = _ux_utility_physical_address(td);
ed -> ux_ohci_ed_head_td = _ux_utility_physical_address(td);
/* We now need to get the type of transfer (control or bulk) to hook this ED to the appropriate list.
We also enable the appropriate list. */
switch ((endpoint -> ux_endpoint_descriptor.bmAttributes) & UX_MASK_ENDPOINT_TYPE)
{
case UX_CONTROL_ENDPOINT:
head_ed = (UX_OHCI_ED *) _ux_hcd_ohci_register_read(hcd_ohci, OHCI_HC_CONTROL_HEAD_ED);
ed -> ux_ohci_ed_next_ed = head_ed;
_ux_hcd_ohci_register_write(hcd_ohci, OHCI_HC_CONTROL_HEAD_ED, (ULONG) _ux_utility_physical_address(ed));
ohci_register = _ux_hcd_ohci_register_read(hcd_ohci, OHCI_HC_CONTROL);
ohci_register |= OHCI_HC_CR_CLE;
_ux_hcd_ohci_register_write(hcd_ohci, OHCI_HC_CONTROL, ohci_register);
break;
case UX_BULK_ENDPOINT:
head_ed = (UX_OHCI_ED *) _ux_hcd_ohci_register_read(hcd_ohci, OHCI_HC_BULK_HEAD_ED);
ed -> ux_ohci_ed_next_ed = head_ed;
_ux_hcd_ohci_register_write(hcd_ohci, OHCI_HC_BULK_HEAD_ED, (ULONG) _ux_utility_physical_address(ed));
ohci_register = _ux_hcd_ohci_register_read(hcd_ohci, OHCI_HC_CONTROL);
ohci_register |= OHCI_HC_CR_BLE;
_ux_hcd_ohci_register_write(hcd_ohci, OHCI_HC_CONTROL, ohci_register);
break;
default:
head_ed = UX_NULL;
}
/* Build the back chaining pointer. The previous head ED needs to know about the
inserted ED. */
if (head_ed != UX_NULL)
{
head_ed = _ux_utility_virtual_address(head_ed);
head_ed -> ux_ohci_ed_previous_ed = ed;
}
/* Return successful completion. */
return(UX_SUCCESS);
}
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