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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_door_bell_wait PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will raise the doorbell and wait for its */
/* acknowledgement. This mechanism is used to safely remove a physical */
/* endpoint from EHCI. */
/* */
/* INPUT */
/* */
/* hcd_ehci Pointer to EHCI controller */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_hcd_ehci_register_read Read EHCI register */
/* _ux_hcd_ehci_register_write Write EHCI register */
/* _ux_host_semaphore_get Get semaphore */
/* _ux_host_semaphore_put Release semaphore */
/* */
/* CALLED BY */
/* */
/* EHCI Controller Driver */
/* */
/**************************************************************************/
VOID _ux_hcd_ehci_door_bell_wait(UX_HCD_EHCI *hcd_ehci)
{
ULONG ehci_register;
UINT status;
/* Protect against multiple thread entry to this HCD. */
status = _ux_host_semaphore_get(&hcd_ehci -> ux_hcd_ehci_protect_semaphore, UX_WAIT_FOREVER);
if (status != UX_SUCCESS)
return;
/* Raise the doorbell to the HCD. */
ehci_register = _ux_hcd_ehci_register_read(hcd_ehci, EHCI_HCOR_USB_COMMAND);
ehci_register |= EHCI_HC_IO_IAAD;
_ux_hcd_ehci_register_write(hcd_ehci, EHCI_HCOR_USB_COMMAND, ehci_register);
/* Wait for the doorbell to be awaken. */
_ux_host_semaphore_get_norc(&hcd_ehci -> ux_hcd_ehci_doorbell_semaphore, UX_WAIT_FOREVER);
/* Free the protection semaphore. */
_ux_host_semaphore_put(&hcd_ehci -> ux_hcd_ehci_protect_semaphore);
/* Return to caller. */
return;
}
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