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