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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_write 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 writes a 32/16/8 bit value to a specific PCI bus */ |
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/* at a certain offset. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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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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/* offset Offset */ |
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/* value Value to write */ |
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/* write_size Size of write */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* outpl PCI output long function */ |
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/* outpw PCI output word function */ |
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/* outpb PCI output byte function */ |
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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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VOID _ux_utility_pci_write(ULONG bus_number, ULONG device_number, ULONG function_number, |
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ULONG offset, ULONG value, UINT write_size) |
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{ |
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ULONG destination_address; |
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ULONG cfg_ctrl; |
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/* Calculate the destination address. */ |
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destination_address = (((bus_number << 16) & 0x00ff0000) | ((device_number << 11) & 0x0000f800) | |
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((function_number << 8) & 0x00000700)); |
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/* Calculate the configure control value. */ |
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cfg_ctrl = destination_address | offset | 0x80000000; |
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/* Process relative to write size. */ |
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✓✓✓✓
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switch(write_size) |
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{ |
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case 32: |
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/* Write the address we need to write to. */ |
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outpl(UX_PCI_CFG_CTRL_ADDRESS, cfg_ctrl); |
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/* Write the 32 bit content of this address. */ |
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outpl(UX_PCI_CFG_DATA_ADDRESS, value); |
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break; |
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case 16: |
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/* Write the address we need to write to. */ |
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outpl(UX_PCI_CFG_CTRL_ADDRESS, cfg_ctrl); |
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/* Write the 16 bit content of this address. */ |
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outpw(UX_PCI_CFG_DATA_ADDRESS + (offset & 2), (USHORT) value); |
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break; |
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case 8: |
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/* Write the address we need to write to. */ |
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outpl(UX_PCI_CFG_CTRL_ADDRESS, cfg_ctrl); |
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/* Write the 8 bit content of this address */ |
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outpb(UX_PCI_CFG_DATA_ADDRESS + (offset & 3), (UCHAR) value); |
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break; |
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default: |
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break; |
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} |
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} |
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