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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_power_root_hubs PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function powers individually or in gang mode the root HUBs */
/* attached to the EHCI controller. */
/* */
/* 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_utility_delay_ms Delay */
/* */
/* CALLED BY */
/* */
/* EHCI Controller Driver */
/* */
/**************************************************************************/
VOID _ux_hcd_ehci_power_root_hubs(UX_HCD_EHCI *hcd_ehci)
{
ULONG ehci_register;
UINT port_index;
/* Read the control PPC field. If the PPC field is set, the controller has
implemented port power. */
ehci_register = _ux_hcd_ehci_register_read(hcd_ehci, EHCI_HCCR_HCS_PARAMS);
if (ehci_register & EHCI_HC_RH_PPC)
{
/* We have power management in this controller. Apply power to each port. */
for (port_index = 0; port_index < hcd_ehci -> ux_hcd_ehci_nb_root_hubs; port_index++)
{
/* Read register first to preserve existing settings. */
ehci_register = _ux_hcd_ehci_register_read(hcd_ehci, EHCI_HCOR_PORT_SC + port_index);
/* Apply power to a port. */
_ux_hcd_ehci_register_write(hcd_ehci, EHCI_HCOR_PORT_SC + port_index, ehci_register | EHCI_HC_PS_PP);
}
}
/* The EHCI needs some time for the power to be stable. */
_ux_utility_delay_ms(EHCI_HC_RH_POWER_STABLE_DELAY);
/* Return to caller. */
return;
}
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