164 lines
3.5 KiB
C
164 lines
3.5 KiB
C
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/*
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* M1523.C - ALI M1523 PCI chipset routines.
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*
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* Notes:
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* Algorithms from ALI M1523 Data Sheet
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*
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*/
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#include "local.h"
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LOCAL_DATA const UCHAR IrqToMaskTable[]={ 0x00,0x00,0x00,0x02,
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0x04,0x05,0x07,0x06,
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0x00,0x01,0x03,0x09,
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0x0b,0x00,0x0d, 0x0f};
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LOCAL_DATA const UCHAR MaskToIRQTable[]={ 0x00,0x09,0x03,0x0a,
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0x04,0x05,0x07,0x06,
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0x00,0x0b,0x00,0x0c,
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0x00, 0x0e,0x00,0x0f};
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/****************************************************************************
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*
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* M1523SetIRQ - Set a M1523 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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M1523SetIRQ(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 > 8) {
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return(PCIMP_INVALID_LINK);
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}
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//
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// Get the IRQ number from the look-up table.
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//
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bIRQNumber=IrqToMaskTable[bIRQNumber&0x0f];
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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)+0x48;
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//
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// Read the old M1523 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 M1523 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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* M1523GetIRQ - Get the IRQ of a M1523 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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M1523GetIRQ(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 > 8) {
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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)+0x48;
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//
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// Read the old M1523 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=MaskToIRQTable[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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* M1523ValidateTable - 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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M1523ValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags);
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#pragma alloc_text(PAGE, M1523ValidateTable)
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#endif //ALLOC_PRAGMA
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PCIMPRET CDECL
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M1523ValidateTable(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 8, it is an error.
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//
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if (GetMaxLink(piihIRQInfoHeader)>8)
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return(PCIMP_FAILURE);
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return(PCIMP_SUCCESS);
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}
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