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194 lines
4.4 KiB
194 lines
4.4 KiB
/*
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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* NS87560.C - NS NS87560 PCI chipset routines.
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*
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* Notes:
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* Algorithms from National Semiconductor NS87560 Data Sheet
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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, NS87560ValidateTable)
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#endif //ALLOC_PRAGMA
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/****************************************************************************
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*
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* NS87560SetIRQ - Set a NS87560 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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NS87560SetIRQ(UCHAR bIRQNumber, UCHAR bLink)
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{
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UCHAR bOffset, bOldValue;
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//
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// Validate link number.
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//
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if (bLink > 4) {
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return(PCIMP_INVALID_LINK);
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}
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//
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// Zero based.
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//
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bLink--;
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//
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// Set various values.
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//
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bOffset=(bLink/2)+0x6C;
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//
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// Read the old NS87560 IRQ register.
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//
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bOldValue=ReadConfigUchar(bBusPIC, bDevFuncPIC, bOffset);
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if (bLink&1) {
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bOldValue&=0x0f;
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bOldValue|=(bIRQNumber<<4);
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}
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else {
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bOldValue&=0xf0;
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bOldValue|=bIRQNumber;
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}
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//
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// Set the NS87560 IRQ register.
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//
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WriteConfigUchar(bBusPIC, bDevFuncPIC, bOffset, bOldValue);
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* NS87560GetIRQ - Get the IRQ of a NS87560 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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NS87560GetIRQ(PUCHAR pbIRQNumber, UCHAR bLink)
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{
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UCHAR bOffset, bOldValue;
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//
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// Validate link number.
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//
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if (bLink > 4) {
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return(PCIMP_INVALID_LINK);
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}
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//
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// Zero based.
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//
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bLink--;
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//
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// Set various values.
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//
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bOffset=(bLink/2)+0x6C;
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//
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// Read the old NS87560 IRQ register.
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//
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bOldValue=ReadConfigUchar(bBusPIC, bDevFuncPIC, bOffset);
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if (bLink&1)
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bOldValue>>=4;
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*pbIRQNumber=bOldValue&0x0f;
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* NS87560SetTrigger - Set the IRQ triggering values for the NS87560
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*
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* Exported.
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*
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* ENTRY: ulTrigger has bits set for Level triggered IRQs.
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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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NS87560SetTrigger(ULONG ulTrigger)
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{
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WriteConfigUchar(bBusPIC, bDevFuncPIC, 0x67, (UCHAR)ulTrigger);
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WriteConfigUchar(bBusPIC, bDevFuncPIC, 0x68, (UCHAR)(ulTrigger >> 8));
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return (PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* NS87560GetTrigger - Get the IRQ triggering values for the NS87560
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*
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* Exported.
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*
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* ENTRY: pulTrigger will have bits set for Level triggered IRQs.
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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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NS87560GetTrigger(PULONG pulTrigger)
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{
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//
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// Assume all edge.
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//
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*pulTrigger = 0;
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*pulTrigger |= ReadConfigUchar(bBusPIC, bDevFuncPIC, 0x67);
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*pulTrigger |= (ReadConfigUchar(bBusPIC, bDevFuncPIC, 0x68) << 8);
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return (PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* NS87560ValidateTable - 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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NS87560ValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags)
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{
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PAGED_CODE();
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//
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// If any link is above 4, it is an error.
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//
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if (GetMaxLink(piihIRQInfoHeader)>4)
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return(PCIMP_FAILURE);
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return(PCIMP_SUCCESS);
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}
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