118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
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/*
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* Cx5520.C - Cyrix Cx5520 PCI chipset routines.
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*
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* Notes:
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* Algorithms from Cyrix Cx5520 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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* Cx5520SetIRQ - Set a Cx5520 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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Cx5520SetIRQ(UCHAR bIRQNumber, UCHAR bLink)
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{
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UCHAR bOldValue, bNewValue, bOffset;
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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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bOffset = (UCHAR)(((bLink - 1) / 2) + 0x5C);
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bOldValue = ReadConfigUchar(bBusPIC, bDevFuncPIC, bOffset);
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if (bLink & 1)
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{
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bNewValue = (UCHAR)((bOldValue & 0xF0) | (bIRQNumber & 0x0F));
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}
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else
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{
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bNewValue = (UCHAR)((bOldValue & 0x0F) | (bIRQNumber << 4));
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}
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WriteConfigUchar(bBusPIC, bDevFuncPIC, bOffset, bNewValue);
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* Cx5520GetIRQ - Get the IRQ of a Cx5520 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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Cx5520GetIRQ(PUCHAR pbIRQNumber, UCHAR bLink)
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{
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UCHAR bOldValue, bOffset;
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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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bOffset = (UCHAR)(((bLink - 1) / 2) + 0x5C);
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bOldValue = ReadConfigUchar(bBusPIC, bDevFuncPIC, bOffset);
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if (!(bLink & 1))
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{
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bOldValue >>= 4;
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}
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*pbIRQNumber = (UCHAR)(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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* Cx5520ValidateTable - 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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Cx5520ValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags);
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#pragma alloc_text(PAGE, Cx5520ValidateTable)
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#endif //ALLOC_PRAGMA
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PCIMPRET CDECL
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Cx5520ValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags)
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{
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PAGED_CODE();
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return ((GetMaxLink(piihIRQInfoHeader) > 4)? PCIMP_FAILURE : PCIMP_SUCCESS);
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}
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