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151 lines
3.4 KiB
151 lines
3.4 KiB
/*
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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* SIS5503.C - SiS5503 PCI System I/O chipset routines
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*
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* Notes:
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* Algorithms from SiS Pentium/P54C PCI/ISA Chipset databook.
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*
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*/
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#include "local.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(INIT, SiS5503ValidateTable)
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#endif //ALLOC_PRAGMA
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/****************************************************************************
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*
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* SiS5503SetIRQ - Set an SiS PCI link to a specific IRQ
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*
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* Exported.
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*
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* ENTRY: bIRQNumber is the new IRQ to be used.
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*
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* bLink is the Link to be set.
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*
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* EXIT: Standard PCIMP return value.
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*
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***************************************************************************/
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PCIMPRET CDECL
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SiS5503SetIRQ(UCHAR bIRQNumber, UCHAR bLink)
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{
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UCHAR bRegValue;
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//
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// Validate link number.
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//
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if (bLink < 0x40) {
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return(PCIMP_INVALID_LINK);
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}
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//
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// Use 0x80 to disable.
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//
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if (!bIRQNumber)
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bIRQNumber=0x80;
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//
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// Preserve other bits.
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//
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bRegValue= (ReadConfigUchar(bBusPIC, bDevFuncPIC, bLink)&(~0x8F))|(bIRQNumber&0x0F);
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//
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// Set the SiS IRQ register.
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//
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WriteConfigUchar(bBusPIC, bDevFuncPIC, bLink, bRegValue);
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* SiS5503GetIRQ - Get the IRQ of an SiS5503 PCI link
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*
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* Exported.
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*
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* ENTRY: pbIRQNumber is the buffer to fill.
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*
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* bLink is the Link to be read.
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*
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* EXIT: Standard PCIMP return value.
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*
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***************************************************************************/
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PCIMPRET CDECL
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SiS5503GetIRQ(PUCHAR pbIRQNumber, UCHAR bLink)
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{
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//
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// Validate link number.
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//
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if (bLink < 0x40) {
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return(PCIMP_INVALID_LINK);
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}
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//
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// Store the IRQ value.
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//
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*pbIRQNumber=(ReadConfigUchar(bBusPIC, bDevFuncPIC, bLink)&0x8F);
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//
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// Return 0 if disabled.
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//
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if (*pbIRQNumber & 0x80)
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*pbIRQNumber=0;
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* Sis5503ValidateTable - Validate an IRQ table
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*
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* Exported.
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*
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* ENTRY: piihIRQInfoHeader points to an IRQInfoHeader followed
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* by an IRQ Routing Table.
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*
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* ulFlags are PCIMP_VALIDATE flags.
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*
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* EXIT: Standard PCIMP return value.
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*
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***************************************************************************/
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PCIMPRET CDECL
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SiS5503ValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags)
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{
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PAGED_CODE();
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if ((ulFlags & PCIMP_VALIDATE_SOURCE_BITS)==PCIMP_VALIDATE_SOURCE_PCIBIOS) {
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//
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// If all links are above 40, we they are config space.
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//
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if (GetMinLink(piihIRQInfoHeader)>=0x40)
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return(PCIMP_SUCCESS);
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//
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// If there are links above 4, we are clueless.
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//
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if (GetMaxLink(piihIRQInfoHeader)>0x04)
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return(PCIMP_FAILURE);
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//
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// Assume 1,2,3,4 are the 41,42,43,44 links.
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//
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NormalizeLinks(piihIRQInfoHeader, 0x40);
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} else {
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//
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// Validate that all config space addresses are above 40.
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//
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if (GetMinLink(piihIRQInfoHeader)<0x40)
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return(PCIMP_FAILURE);
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}
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return(PCIMP_SUCCESS);
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}
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