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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** Utility */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_utility_pci_class_scan PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function scans the PCI bus from a certain position for a */ |
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/* specific PCI class. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* pci_class PCI class requested */ |
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/* bus_number PCI bus number */ |
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/* device_number Device number */ |
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/* function_number Function number */ |
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/* current_bus_number Current bus number */ |
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/* current_device_number Current device number */ |
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/* current_function_number Current function number */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* 32-bit value */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_utility_pci_read PCI read utility */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* USBX Components */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */ |
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/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* */ |
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/**************************************************************************/ |
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ULONG _ux_utility_pci_class_scan(ULONG pci_class, ULONG bus_number, ULONG device_number, |
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ULONG function_number, ULONG *current_bus_number, |
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ULONG *current_device_number, ULONG *current_function_number) |
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{ |
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ULONG bus_number_index; |
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ULONG device_number_index; |
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ULONG function_number_index; |
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ULONG value; |
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ULONG current_pci_class; |
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/* Scan all bus. */ |
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✓✓ |
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for (bus_number_index = bus_number; bus_number_index <= UX_PCI_NB_BUS; bus_number_index++) |
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{ |
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/* Scan all devices. */ |
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✓✓ |
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for(device_number_index = device_number;device_number_index <= UX_PCI_NB_DEVICE; device_number_index++) |
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{ |
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/* Scan all functions. */ |
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✓✓ |
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for(function_number_index = function_number; function_number_index <= UX_PCI_NB_FUNCTIONS; function_number_index++) |
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{ |
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/* Reset all PCI address for next loop. */ |
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function_number = 0; |
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device_number = 0; |
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bus_number = 0; |
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/* Read the PCI class bus/device/function. */ |
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value = _ux_utility_pci_read(bus_number_index, device_number_index, function_number_index, |
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UX_PCI_CFG_REVISION,32); |
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/* Isolate the class code which is in the upper 3 bytes. */ |
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current_pci_class = (value >> 8) & 0x00ffffff; |
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/* Do we have a match with the demanded class? */ |
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✓✓ |
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if(current_pci_class == pci_class) |
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{ |
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/* Return the position of this device on the PCI */ |
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*current_bus_number = bus_number_index; |
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*current_device_number = device_number_index; |
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*current_function_number = function_number_index; |
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/* Return success! */ |
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return(UX_SUCCESS); |
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} |
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} |
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} |
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} |
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/* Return an error since we didn't find anything. */ |
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return(UX_ERROR); |
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} |
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