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160 lines
3.4 KiB
160 lines
3.4 KiB
/*
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* VT586.C - VIA Technologies PCI chipset routines.
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*
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* Notes:
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* Algorithms from VIATECH 82C586B Data Sheet
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* Compaq contact:
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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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* VT586SetIRQ - Set a VIATECH 82C586B 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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VT586SetIRQ(UCHAR bIRQNumber, UCHAR bLink)
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{
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UCHAR bOffset, bOldValue;
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switch (bLink)
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{
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case 1: case 2:
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case 3: case 5:
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break;
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default:
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return (PCIMP_INVALID_LINK);
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}
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//
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// Compute the offset in config space.
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//
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bOffset=(bLink/2)+0x55;
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//
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// Read the old VT82C586 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 VT82C586B 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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* VT586GetIRQ - Get the IRQ of a VIATECH 82C586B 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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VT586GetIRQ(PUCHAR pbIRQNumber, UCHAR bLink)
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{
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UCHAR bOffset, bOldValue;
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switch (bLink)
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{
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case 1: case 2:
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case 3: case 5:
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break;
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default:
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return (PCIMP_INVALID_LINK);
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}
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//
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// Set various values.
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//
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bOffset=(bLink/2)+0x55;
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//
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// Read the old VT82C586 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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* VT586ValidateTable - 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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VT586ValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags);
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#pragma alloc_text(PAGE, VT586ValidateTable)
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#endif //ALLOC_PRAGMA
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PCIMPRET CDECL
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VT586ValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags)
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{
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PIRQINFO pii=(PIRQINFO)(((PUCHAR) piihIRQInfoHeader)+sizeof(IRQINFOHEADER));
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ULONG i, j;
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ULONG cEntries=(piihIRQInfoHeader->TableSize-sizeof(IRQINFOHEADER))/sizeof(IRQINFO);
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PAGED_CODE();
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for (i=0; i<cEntries; i++, pii++) {
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for (j=0; j<4; j++) {
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if (pii->PinInfo[j].Link<=3 || pii->PinInfo[j].Link==5)
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continue;
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return (PCIMP_FAILURE);
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}
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}
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return(i? PCIMP_SUCCESS : PCIMP_FAILURE);
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}
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