180 lines
4.1 KiB
C
180 lines
4.1 KiB
C
/*
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* NEC.C - NEC C98Bus Bridge chipset routines.
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*
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*/
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#include "local.h"
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/****************************************************************************
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*
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* NECSetIRQ - Set a Triton 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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NECSetIRQ(UCHAR bIRQNumber, 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 < 0x60) {
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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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// Set the Triton IRQ register.
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//
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WriteConfigUchar(bBusPIC, bDevFuncPIC, bLink, bIRQNumber);
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* NECGetIRQ - Get the IRQ of a Triton 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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NECGetIRQ(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 < 0x60) {
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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);
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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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* NECSetTrigger - Set the IRQ triggering values for an Intel system.
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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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NECSetTrigger(ULONG ulTrigger)
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{
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// PC-9800 can not handle IRQ trigger.
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// we have nothing to do.
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* NECGetTrigger - Get the IRQ triggering values for an Intel system.
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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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NECGetTrigger(PULONG pulTrigger)
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{
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// PC-9800 can not handle IRQ trigger.
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// We fake IRQ triggering value so that PCI.VXD works fine.
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*pulTrigger = 0xffff;
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* NECValidateTable - 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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#ifdef ALLOC_PRAGMA
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PCIMPRET CDECL
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NECValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags);
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#pragma alloc_text(PAGE, NECValidateTable)
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#endif //ALLOC_PRAGMA
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PCIMPRET CDECL
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NECValidateTable(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 60, we they are config space.
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//
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if (GetMinLink(piihIRQInfoHeader)>=0x60)
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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 60,61,62,63 links.
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//
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NormalizeLinks(piihIRQInfoHeader, 0x5F);
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} else {
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//
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// Validate that all config space addresses are above 60.
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//
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if (GetMinLink(piihIRQInfoHeader)<0x60)
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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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