154 lines
3.2 KiB
C
154 lines
3.2 KiB
C
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/*
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* CPQOSB.C - COMPAQ OSB PCI chipset routines.
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*
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* Notes:
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* Algorithms from COMPAQ OSB Data Sheet
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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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* CPQOSBSetIRQ - Set a CPQOSB 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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CPQOSBSetIRQ(UCHAR bIRQNumber, UCHAR bLink)
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{
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UCHAR bOldValue, bOldIndex;
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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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// Convert link to index.
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//
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bLink+=3;
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//
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// Save the old index value.
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//
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bOldIndex=READ_PORT_UCHAR((PUCHAR)0xC00);
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//
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// Setup to process the desired link.
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//
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WRITE_PORT_UCHAR((PUCHAR)0xC00, bLink);
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//
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// Read the old IRQ value.
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//
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bOldValue=(UCHAR)(READ_PORT_UCHAR((PUCHAR)0xC01) & 0xf0);
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bOldValue|=bIRQNumber;
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//
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// Set the OSB IRQ register.
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//
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WRITE_PORT_UCHAR((PUCHAR)0xC01, bOldValue);
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//
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// Restore the old index value.
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//
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WRITE_PORT_UCHAR((PUCHAR)0xC00, bOldIndex);
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* CPQOSBGetIRQ - Get the IRQ of a CPQOSB 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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CPQOSBGetIRQ(PUCHAR pbIRQNumber, UCHAR bLink)
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{
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UCHAR bOldValue, bOldIndex;
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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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// Convert link to index.
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//
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bLink+=3;
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//
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// Save the old index value.
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//
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bOldIndex=READ_PORT_UCHAR((PUCHAR)0xC00);
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//
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// Setup to read the correct link.
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//
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WRITE_PORT_UCHAR((PUCHAR)0xC00, bLink);
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bOldValue=READ_PORT_UCHAR((PUCHAR)0xC01);
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*pbIRQNumber=bOldValue&0x0f;
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//
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// Restore the old index value.
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//
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WRITE_PORT_UCHAR((PUCHAR)0xC00, bOldIndex);
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* CPQOSBValidateTable - 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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CPQOSBValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags);
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#pragma alloc_text(PAGE, CPQOSBValidateTable)
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#endif //ALLOC_PRAGMA
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PCIMPRET CDECL
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CPQOSBValidateTable(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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