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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_interrupt_handler PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the interrupt handler for the EHCI interrupts. */
/* Normally an interrupt occurs from the controller when there is */
/* either a EOF signal and there has been transfers within the frame */
/* or when there is a change on one of the downstream ports, a */
/* doorbell signal or an unrecoverable error. */
/* */
/* All we need to do in the ISR is scan the controllers to find out */
/* which one has issued a IRQ. If there is work to do for this */
/* controller we need to wake up the corresponding thread to take care */
/* of the job. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_hcd_ehci_controller_disable Disable controller */
/* _ux_hcd_ehci_register_read Read EHCI register */
/* _ux_hcd_ehci_register_write Write EHCI register */
/* _ux_host_semaphore_put Put semaphore */
/* */
/* CALLED BY */
/* */
/* EHCI Controller Driver */
/* */
/**************************************************************************/
VOID _ux_hcd_ehci_interrupt_handler(VOID)
{
UINT hcd_index;
UX_HCD *hcd;
UX_HCD_EHCI *hcd_ehci;
ULONG ehci_register;
ULONG ehci_register_port_status;
ULONG root_hub_thread_wakeup = 0;
ULONG port_index;
/* We need to parse the controller driver table to find all controllers that registered
as EHCI. */
for (hcd_index = 0; hcd_index < _ux_system_host -> ux_system_host_registered_hcd; hcd_index++)
{
/* Check type of controller. */
if (_ux_system_host -> ux_system_host_hcd_array[hcd_index].ux_hcd_controller_type == UX_EHCI_CONTROLLER)
{
/* Get the pointers to the generic HCD and EHCI specific areas. */
hcd = &_ux_system_host -> ux_system_host_hcd_array[hcd_index];
hcd_ehci = (UX_HCD_EHCI *) hcd -> ux_hcd_controller_hardware;
/* Check if the controller is operational, if not, skip it. */
if (hcd -> ux_hcd_status == UX_HCD_STATUS_OPERATIONAL)
{
/* For debugging purposes, increment the interrupt count. */
hcd_ehci -> ux_hcd_ehci_interrupt_count++;
/* We get the current interrupt status for this controller. */
ehci_register = _ux_hcd_ehci_register_read(hcd_ehci, EHCI_HCOR_USB_STATUS);
/* We acknowledge the interrupts for this controller so that it
can continue to work. */
_ux_hcd_ehci_register_write(hcd_ehci, EHCI_HCOR_USB_STATUS, ehci_register);
/* Examine the source of interrupts. */
if ((ehci_register & EHCI_HC_STS_USB_INT) || (ehci_register & EHCI_HC_STS_USB_ERR_INT))
{
/* We have some transactions done in the past frame/micro-frame.
The controller thread needs to wake up and process them. */
hcd -> ux_hcd_thread_signal++;
_ux_host_semaphore_put(&_ux_system_host -> ux_system_host_hcd_semaphore);
}
if (ehci_register & EHCI_HC_STS_HSE)
{
/* The controller has issued a Host System Error which is fatal.
The controller will be reset now, and we wake up the HCD thread. */
_ux_hcd_ehci_controller_disable(hcd_ehci);
hcd -> ux_hcd_thread_signal++;
hcd -> ux_hcd_status = UX_HCD_STATUS_DEAD;
hcd -> ux_hcd_thread_signal++;
_ux_host_semaphore_put(&_ux_system_host -> ux_system_host_hcd_semaphore);
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_INTERRUPT, UX_SYSTEM_CONTEXT_HCD, UX_CONTROLLER_DEAD);
}
if (ehci_register & EHCI_HC_STS_PCD)
{
/* The controller has issued a Root hub status change signal. Scan all ports. */
for (port_index = 0; port_index < hcd_ehci -> ux_hcd_ehci_nb_root_hubs; port_index++)
{
/* Read the port status. */
ehci_register_port_status = _ux_hcd_ehci_register_read(hcd_ehci, EHCI_HCOR_PORT_SC + port_index);
/* Check for Connect Status Change signal. */
if (ehci_register_port_status & EHCI_HC_PS_CSC)
{
/* Something happened on this port. Signal it to the root hub thread. */
hcd -> ux_hcd_root_hub_signal[port_index]++;
/* Memorize wake up signal. */
root_hub_thread_wakeup ++;
}
}
/* We only wake up the root hub thread if there has been device insertion/extraction. */
if (root_hub_thread_wakeup != 0)
/* The controller has issued a Root hub status change signal.
We need to resume the thread in charge of the USB topology. */
_ux_host_semaphore_put(&_ux_system_host -> ux_system_host_enum_semaphore);
}
if (ehci_register & EHCI_HC_STS_IAA)
{
/* The controller has issued a Door Bell status change signal.
We need to resume the thread who raised the doorbell. */
_ux_host_semaphore_put(&hcd_ehci -> ux_hcd_ehci_doorbell_semaphore);
}
}
}
}
}
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